@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #2563EB;
    --secondary-color: #1D4ED8;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #f0f2f5;
    --card-background: rgba(255, 255, 255, 0.5);
    --text-color: #333;
    --light-text-color: #666;
    --border-color: #e0e0e0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
}

body[data-theme="dark"] {
    --primary-color: #3b82f6;
    --secondary-color: #60a5fa;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #111827;
    --card-background: rgba(0, 0, 0, 0.6);
    --text-color: #f9fafb;
    --light-text-color: #9ca3af;
    --border-color: #374151;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-image: url('assets/bg.webp');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 2rem;
    transition: background-color 0.3s, color 0.3s;
    position: relative;
}

/* 배경 위에 흰색 오버레이 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    z-index: -1;
    pointer-events: none;
}

body[data-theme="dark"]::before {
    background: rgba(0, 0, 0, 0.4);
}

/* 다크 모드 전용 배경 이미지 */
body[data-theme="dark"] {
    background-image: url('assets/bgdk.webp');
}

.container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Navigation Header */
.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    background: transparent;
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    position: sticky;
    top: 0;
    z-index: 1000;
    margin: -2rem -2rem 2rem -2rem;
    border-bottom: none;
    transition: backdrop-filter 0.3s ease;
}

/* 스크롤 시 blur 효과 적용 (데스크톱) */
.top-nav.scrolled {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.top-nav > * {
    margin: 0 2rem;
}

@media (max-width: 768px) {
    .top-nav > * {
        margin: 0.8rem;
    }

    .nav-left {
        margin-left: 0.8rem !important;
    }

    .nav-center {
        margin-right: 0 !important;
    }
}

body[data-theme="dark"] .top-nav {
    background: transparent;
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
    border-bottom: none;
}

body[data-theme="dark"] .top-nav.scrolled {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
    height: 100%;
}

.nav-link {
    color: var(--light-text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
    display: flex;
    align-items: center;
    line-height: 1;
}

.nav-link:hover {
    color: var(--text-color);
}

.nav-link.active {
    color: var(--primary-color);
    font-weight: 700;
}


/* Logo styles in nav */
.hqmx-brand {
    position: static;
    transform: none;
}

.hqmx-brand h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-color);
    margin: 0;
    opacity: 1;
}

.converter-logo-link {
    text-decoration: none;
    cursor: pointer;
    display: inline-block;
    transition: opacity 0.3s ease, transform 0.2s ease;
}

.converter-logo-link:hover {
    opacity: 0.8;
    transform: translateY(-1px);
}

.converter-logo {
    display: flex;
    align-items: center;
}

.converter-logo .converter-text {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 1px;
    line-height: 1;
    display: flex;
    align-items: center; /* C의 중간에 나머지 글자 정렬 */
}

.converter-logo .converter-c {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

.converter-logo .converter-rest {
    color: var(--text-color);
    font-weight: 800;
    font-size: 0.72em; /* 대문자를 소문자 크기로 */
    text-transform: uppercase;
    position: relative;
    top: 0.08em; /* 아주 살짝 아래로 */
}

/* DOWNLOADER Logo */
.downloader-logo {
    display: flex;
    align-items: center;
}

.downloader-logo .downloader-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: 1px;
    line-height: 1;
    display: flex;
    align-items: center;
}

.downloader-logo .downloader-d {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
    line-height: 1;
    font-size: 0.95em;
}

.downloader-logo .downloader-rest {
    color: var(--text-color);
    font-weight: 800;
    font-size: 0.72em;
    text-transform: uppercase;
    line-height: 1;
    position: relative;
    top: 0.05em;
}

/* Header */
.header {
    text-align: center;
    position: relative;
    margin-bottom: 2rem;
}

.theme-toggle-btn {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    overflow: hidden;
}

/* Language Switcher */
.language-switcher {
    position: relative;
}

.language-selector-btn {
    background: var(--card-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0 1rem;
    height: 40px;
    border-radius: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

body[data-theme="dark"] .language-selector-btn {
    color: var(--text-color);
}

.language-selector-btn:hover {
    transform: scale(1.05);
}

.language-selector-btn .fa-chevron-down {
    transition: transform 0.3s ease;
}

.language-switcher.open .language-selector-btn .fa-chevron-down {
    transform: rotate(180deg);
}

.language-options {
    display: none;
    position: absolute;
    top: calc(100% + 5px);
    right: 0;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    padding: 0.5rem;
    z-index: 1000;
    max-height: 300px;
    overflow-y: auto;
    width: 200px;
}

.language-switcher.open .language-options {
    display: block;
}

.language-options a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.2s;
}

.language-options a:hover {
    background-color: var(--background-color);
}

.theme-toggle-btn:hover {
    transform: scale(1.1);
}

.theme-toggle-btn .fa-sun {
    display: none;
    color: #f39c12;
}
.theme-toggle-btn .fa-moon {
    color: #f1c40f;
}

body[data-theme="dark"] .theme-toggle-btn .fa-sun {
    display: block;
}

body[data-theme="dark"] .theme-toggle-btn .fa-moon {
    display: none;
}


.logo-x {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 0.8rem;
    color: var(--light-text-color);
    letter-spacing: 12px;
    margin-top: 0.5rem;
    margin-bottom: 0.75rem;
}

@media (max-width: 768px) {
    .tagline {
        letter-spacing: 4px;
        margin-top: 0.375rem;
        margin-bottom: 1rem;
    }
}

@media (max-width: 480px) {
    .tagline {
        letter-spacing: 6px;
        margin-top: 0.75rem;
    }
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    position: relative;
}

/* Main Content Sections */
.main-content section {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 0.8rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Upload Section */
.upload-container {
    width: 100%;
}

.upload-container h4 {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem 1.5rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    background: rgba(240, 242, 245, 0.2);
    position: relative;
    overflow: hidden;
    /* 모바일 터치 이벤트 최적화 */
    touch-action: manipulation;
    -webkit-tap-highlight-color: rgba(37, 99, 235, 0.1);
    user-select: none;
    -webkit-user-select: none;
}

/* 그라데이션 애니메이션 효과 (데스크톱 전용) */
.upload-zone::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.15), transparent);
    transition: left 0.6s ease;
    pointer-events: none;
}

@media (min-width: 769px) {
    .upload-zone:hover::before {
        left: 100%;
    }
}

/* 모바일에서는 upload zone 클릭을 비활성화 */
@media (max-width: 768px) {
    .upload-zone {
        cursor: default;
        -webkit-tap-highlight-color: transparent;
    }

    .upload-zone:hover {
        transform: none;
        background: rgba(240, 242, 245, 0.2);
        border-color: var(--border-color);
    }

    body[data-theme="dark"] .upload-zone:hover {
        background: rgba(0, 0, 0, 0.5);
    }
}

body[data-theme="dark"] .upload-zone {
    background: rgba(0, 0, 0, 0.5);
    border: 2px solid rgba(55, 65, 81, 0.4);
}

.upload-zone:hover {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.05);
    transform: translateY(-2px);
}

.upload-zone.dragover {
    border-color: #2563eb;
    background: rgba(37, 99, 235, 0.1);
    transform: scale(1.02);
}

body[data-theme="dark"] .upload-zone:hover {
    background: rgba(59, 130, 246, 0.1);
}

body[data-theme="dark"] .upload-zone.dragover {
    background: rgba(59, 130, 246, 0.2);
}

/* 업로드 패널 축소 상태 */
.upload-zone.collapsed {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-style: solid;
    background: rgba(240, 242, 245, 0.1);
    transition: all 0.3s ease;
    min-height: auto;
}

body[data-theme="dark"] .upload-zone.collapsed {
    background: rgba(0, 0, 0, 0.3);
}

.upload-zone.collapsed .upload-icon,
.upload-zone.collapsed .upload-text,
.upload-zone.collapsed .cloud-btn {
    display: none;
}

.upload-zone.collapsed .upload-buttons {
    margin: 0;
    justify-content: center;
}

.upload-zone.collapsed .upload-btn {
    margin: 0;
}

.upload-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.375rem;
    position: relative;
    z-index: 1;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.upload-text {
    position: relative;
    z-index: 1;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.upload-text .main-text {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.upload-text .sub-text {
    font-size: 0.9rem;
    color: var(--light-text-color);
    margin-bottom: 1rem;
}

.upload-btn {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    color: white;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    position: relative;
    z-index: 1;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(130, 73, 254, 0.4);
}

/* Upload Buttons Container */
.upload-buttons {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

/* Cloud Storage Buttons */
.cloud-btn {
    border: 2px solid var(--border-color);
    background: var(--card-background);
    color: var(--text-color);
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.dropbox-btn {
    border-color: #0061ff;
}

.dropbox-btn:hover {
    background: #0061ff;
    color: white;
    border-color: #0061ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 97, 255, 0.3);
}

.gdrive-btn {
    border-color: #4285f4;
}

.gdrive-btn:hover {
    background: #4285f4;
    color: white;
    border-color: #4285f4;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(66, 133, 244, 0.3);
}

/* Cloud button responsive styles */
@media (max-width: 768px) {
    .upload-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }

    .upload-btn,
    .cloud-btn {
        width: 100%;
        justify-content: center;
    }

    /* 태블릿에서 변환 모달 format-grid 조정 */
    .format-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.4rem;
    }

    #formatOptions .format-badge {
        padding: 0.35rem 0.5rem;
        font-size: 0.7rem;
        min-height: 30px;
    }
}

@media (max-width: 480px) {
    .cloud-btn {
        padding: 0.65rem 1.25rem;
        font-size: 0.85rem;
    }

    .upload-buttons {
        gap: 0.5rem;
    }

    /* 모바일에서 변환 모달 format-grid 조정 */
    .format-grid {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 0.3rem;
        max-width: 100%;
        overflow: visible; /* box-shadow가 잘리지 않도록 visible로 변경 */
        padding: 20px; /* 선택된 버튼의 box-shadow를 위한 충분한 공간 */
    }

    #formatOptions .format-badge {
        padding: 0.25rem 0.3rem;
        font-size: 0.6rem;
        min-height: 24px;
        width: 100%;
        box-sizing: border-box;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* 모바일 모달 최적화 */
    .modal-content {
        width: 95% !important;
        max-height: 90vh !important;
        margin: 1rem auto;
    }

    .modal-body {
        padding: 2rem 1.5rem 1.5rem 1.5rem !important; /* box-shadow 공간 확보 */
    }

    .format-selection h4 {
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }

    .format-categories {
        gap: 0.3rem;
        margin-bottom: 1.5rem;
    }

    .format-category {
        padding: 0.4rem 0.6rem;
        font-size: 0.7rem;
    }

    .format-grid {
        margin-top: 0.5rem;
    }

    .modal-footer {
        padding: 0.8rem 1rem;
        gap: 0.5rem;
    }

    /* Advanced Settings 모바일 최적화 */
    .settings-grid {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.5rem !important;
    }

    .setting-item {
        gap: 0.3rem;
    }

    .setting-item label {
        font-size: 0.8rem;
    }

    .setting-item input,
    .setting-item select {
        font-size: 0.8rem;
        padding: 0.4rem;
    }

    /* 아이폰 모바일에서 햄버거 메뉴 토글 버튼 강제 표시 */
    .mobile-menu-overlay .mobile-menu-controls {
        display: block !important;
        visibility: visible !important;
        opacity: 1 !important;
        position: relative !important;
        z-index: 1002 !important;
    }

    .mobile-menu-overlay .mobile-control-item {
        display: flex !important;
        flex-direction: column !important;
        align-items: center !important;
        gap: 1rem !important;
        width: 100% !important;
        visibility: visible !important;
        opacity: 1 !important;
        position: relative !important;
        z-index: 1002 !important;
    }

    .mobile-menu-overlay .mobile-theme-toggle-btn,
    .mobile-menu-overlay .mobile-language-selector-btn {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
        position: relative !important;
        z-index: 1003 !important;
        background: var(--card-background) !important;
        border: 2px solid var(--border-color) !important;
        color: var(--text-color) !important;
    }

    .mobile-menu-overlay .mobile-theme-toggle-btn {
        width: 40px !important;
        height: 40px !important;
        min-width: 40px !important;
        min-height: 40px !important;
    }

    .mobile-menu-overlay .mobile-language-selector-btn {
        height: 40px !important;
        min-height: 40px !important;
        padding: 0 0.75rem !important;
    }

    /* 메뉴 오버레이가 열려있을 때만 적용 */
    .mobile-menu-overlay.show .mobile-menu-controls,
    .mobile-menu-overlay.show .mobile-control-item,
    .mobile-menu-overlay.show .mobile-theme-toggle-btn,
    .mobile-menu-overlay.show .mobile-language-selector-btn {
        display: flex !important;
        visibility: visible !important;
        opacity: 1 !important;
    }
}

/* File List Section */
.file-list-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
    text-align: center;
}

.file-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 1rem 2.5rem;
    background: rgba(240, 242, 245, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.3s ease;
}

body[data-theme="dark"] .file-item {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.file-item:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.file-item .file-icon {
    font-size: 1.5rem;
    margin-right: 1rem;
    color: var(--primary-color);
    flex-shrink: 0;
}

/* iPhone-sized screens: 모바일 최적화 레이아웃 */
@media (max-width: 430px) {
    /* 한 줄에 모든 요소 배치: 아이콘 - 파일정보 - 버튼들 */
    .file-item {
        align-items: center;
        flex-wrap: nowrap;
        padding: 0.9rem 0.75rem 0.9rem 0.6rem; /* 좌측 패딩을 줄여서 아이콘을 왼쪽에 붙임 */
        gap: 0.4rem; /* 전체 간격 축소 */
    }

    .file-info {
        flex: 1 1 auto;
        min-width: 0;
    }

    .file-name {
        margin: 0 0 0.15rem 0;
        font-size: 0.95rem;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .file-size {
        margin: 0;
        font-size: 0.8rem;
        line-height: 1.2;
    }

    .file-actions {
        display: flex;
        align-items: center;
        gap: 0.4rem;
        flex-shrink: 0;
    }

    .convert-btn, .remove-btn {
        padding: 0.4rem 0.6rem;
        font-size: 0.85rem;
        min-height: 32px;
        box-sizing: border-box;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /* 모바일에서 Convert 버튼 텍스트 숨기고 아이콘만 표시 */
    .convert-btn span,
    .download-btn span {
        display: none;
    }

    /* 버튼 아이콘 크기 조정 */
    .convert-btn i,
    .remove-btn i,
    .download-btn i {
        font-size: 1rem;
        margin: 0;
    }

    /* 파일 아이콘과 파일 정보를 하나의 컨테이너처럼 보이게 */
    .file-item .file-icon {
        background: rgba(37, 99, 235, 0.1);
        padding: 0.4rem; /* 배경 패딩 축소로 컴팩트하게 */
        border-radius: 6px; /* 작은 아이콘에 맞춰 border-radius도 축소 */
        flex-shrink: 0;
        font-size: 1.2rem; /* 아이콘 크기 축소 */
        margin-right: 0; /* margin 제거 - gap으로 간격 조절 */
    }

    body[data-theme="dark"] .file-item .file-icon {
        background: rgba(59, 130, 246, 0.15);
    }

    body[dir="rtl"] .file-item .file-icon {
        margin-left: 0;
        margin-right: 0;
    }
}

.file-info {
    flex-grow: 1;
}

.file-name {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.file-size {
    font-size: 0.85rem;
    color: var(--light-text-color);
}

.file-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.convert-btn, .remove-btn, .download-btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    min-height: 36px;
    box-sizing: border-box;
}

.convert-btn {
    background: transparent;
    color: #2563EB;
    border: 2px solid #2563EB;
}

.convert-btn:hover {
    background: linear-gradient(45deg, #2563EB, #3b82f6, #60a5fa);
    color: white;
    transform: translateY(-1px);
}

.remove-btn {
    background: transparent;
    color: #dc143c;
    border: 2px solid #dc143c;
}

.remove-btn:hover {
    background: #dc143c;
    color: white;
    transform: translateY(-1px);
}

.download-btn {
    background: linear-gradient(45deg, #2563EB, #3b82f6, #60a5fa);
    color: white;
}

.download-btn:hover {
    background: linear-gradient(45deg, #1d4ed8, #2563EB, #3b82f6);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.batch-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.clear-all-btn, .convert-all-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.clear-all-btn {
    background: transparent;
    color: #dc143c;
    border: 2px solid #dc143c;
}

.clear-all-btn:hover {
    background: #dc143c;
    color: white;
}

.convert-all-btn {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    color: white;
}

.convert-all-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(130, 73, 254, 0.4);
}

/* Adsterra Banner 728x90 (반응형) */
.adsterra-banner-container {
    width: 100%;
    max-width: 728px;
    height: auto;
    min-height: 90px;
    margin: 1.5rem auto;
    overflow: visible;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.02);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* 태블릿 (768px 이하) - scale 대신 width 100% */
@media (max-width: 768px) {
    .adsterra-banner-container {
        width: 95%;
        max-width: none;
        min-height: 70px;
        margin: 1rem auto;
        transform: none;
    }
}

/* 모바일 (480px 이하) - 화면에 맞춰 전체 표시 */
@media (max-width: 480px) {
    .adsterra-banner-container {
        width: 100%;
        max-width: none;
        height: 60px; /* 90px * 0.65 약산 */
        margin: 1rem auto;
        padding: 0;
        transform: none;
        overflow: hidden;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    /* 광고를 화면 너비에 맞게 축소 (400px / 728px ≈ 0.55) */
    .adsterra-banner-container iframe,
    .adsterra-banner-container > div,
    .adsterra-banner-container > script + * {
        transform: scale(0.55) !important;
        transform-origin: center center !important;
    }
}

/* 극소형 모바일 (380px 이하) */
@media (max-width: 380px) {
    .adsterra-banner-container {
        height: 55px;
    }

    .adsterra-banner-container iframe,
    .adsterra-banner-container > div,
    .adsterra-banner-container > script + * {
        transform: scale(0.52) !important;
    }
}

/* 다크 모드 배경 */
body[data-theme="dark"] .adsterra-banner-container {
    background: rgba(255, 255, 255, 0.03);
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: white;
    border-radius: var(--border-radius);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    overflow-x: visible;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

body[data-theme="dark"] .modal-content {
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid rgba(55, 65, 81, 0.4);
    backdrop-filter: blur(8px);
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--light-text-color);
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--background-color);
    color: var(--text-color);
}

.modal-body {
    padding: 1.5rem;
}

/* Multiple files preview */
.multiple-files-preview h4 {
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-size: 1rem;
}

.files-list {
    max-height: 120px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.3rem;
    margin-bottom: 1rem;
}

.modal-file-item {
    display: flex;
    align-items: center;
    padding: 0.3rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
}

.modal-file-item:last-child {
    border-bottom: none;
}

.modal-file-item i {
    margin-right: 0.4rem;
    color: var(--primary-color);
    width: 14px;
    font-size: 0.7rem;
}

.modal-file-name {
    flex: 1;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.modal-file-size {
    color: var(--light-text-color);
    font-size: 0.7rem;
    margin-left: 0.3rem;
}

.file-preview {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: rgba(240, 242, 245, 0.2);
    border-radius: 8px;
    margin-bottom: 1.5rem;
}

body[data-theme="dark"] .file-preview {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.file-preview i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-right: 1rem;
}

.file-details .file-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

.file-details .file-size {
    color: var(--light-text-color);
}

.format-selection h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    text-align: center;
}

.format-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.format-category {
    background: rgba(240, 242, 245, 0.2);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-width: 85px;
    min-height: 48px;
    text-align: center;
    flex: 1;
}

body[data-theme="dark"] .format-category {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.format-category:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.format-category.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.3);
    border-radius: 8px;
}

/* 다크모드에서 선택된 카테고리 버튼 강화 */
body[data-theme="dark"] .format-category.active {
    background: rgba(0, 0, 0, 0.8) !important;
    border: 2px solid var(--primary-color) !important;
    color: white !important;
    box-shadow: none !important;
    border-radius: 8px !important;
}

.format-options {
    margin: 3.5rem 0 1.5rem 0;
    max-height: 400px;
    overflow: visible;
    display: block;
    width: 100%;
    padding: 20px; /* 선택된 버튼의 box-shadow를 위한 충분한 공간 */
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.15rem;
    margin-top: 1rem;
    max-width: 100%;
    justify-content: center;
    margin-left: auto;
    margin-right: auto;
    padding: 20px; /* 선택된 버튼의 box-shadow를 위한 충분한 공간 */
    overflow: visible; /* box-shadow가 잘리지 않도록 */
}

/* 변환 모달의 format-badge 크기 조정 */
#conversionModal .format-badge,
#formatOptions .format-badge {
    padding: 0.4rem 0.5rem;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid var(--border-color);
    min-height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-color);
    backdrop-filter: blur(10px);
}

body[data-theme="dark"] #conversionModal .format-badge,
body[data-theme="dark"] #formatOptions .format-badge {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}


#conversionModal .format-badge:hover,
#formatOptions .format-badge:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

#conversionModal .format-badge.selected,
#formatOptions .format-badge.selected {
    background: var(--primary-color) !important;
    color: white !important;
    transform: translateY(-2px) scale(1.05);
    border: 2px solid var(--primary-color) !important;
    border-radius: 8px !important;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
    backdrop-filter: none !important;
    overflow: visible !important;
    position: relative;
    z-index: 1;
}

/* 다크모드에서 선택된 확장자 버튼 */
body[data-theme="dark"] #conversionModal .format-badge.selected,
body[data-theme="dark"] #formatOptions .format-badge.selected {
    background: rgba(0, 0, 0, 0.8) !important;
    border: 2px solid var(--primary-color) !important;
    color: white !important;
    box-shadow: none !important;
    border-radius: 8px !important;
    transform: translateY(-2px) scale(1.05);
}

.format-option {
    background: rgba(240, 242, 245, 0.2);
    border: 2px solid var(--border-color);
    color: var(--text-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

body[data-theme="dark"] .format-option {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.format-option:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* 추천 스타일 제거됨 */

.format-option.selected {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.advanced-settings h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.setting-item label {
    font-weight: 500;
    color: var(--light-text-color);
    font-size: 0.9rem;
}

.setting-item select,
.setting-item input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--card-background);
    color: var(--text-color);
    font-size: 0.9rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.advanced-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.advanced-toggle:hover {
    background: var(--background-color);
}

.start-conversion-btn {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.start-conversion-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(130, 73, 254, 0.4);
}

/* Progress Styles */
.file-progress {
    width: 98%;
    height: 4px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 2px;
    transition: width 0.3s ease;
    width: 0%;
}

/* Feature Section */
.feature-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    padding: 1rem 0;
    background: transparent;
    border: none;
    box-shadow: none;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

body[data-theme="dark"] .feature-item {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

/* .feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
} */

.feature-icon-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 56px;
    margin-bottom: 1rem;
}

.feature-icon-text {
    font-size: 2.5rem;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8, #1e40af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.feature-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-item p {
    font-size: 0.9rem;
    color: var(--light-text-color);
    line-height: 1.5;
}

/* Formats Section */
.formats-section h3 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.formats-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--light-text-color);
    margin-bottom: 1rem;
}


/* 메인 페이지 format-grid - 반응형 */
.formats-section .format-grid {
    display: grid;
    grid-template-columns: 1fr; /* 기본 모바일 1열 */
    gap: 2rem;
}

/* 태블릿 이상 - 2열 고정 */
@media (min-width: 768px) {
    .formats-section .format-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* 마지막 패널(Social Media)이 2열을 차지하도록 설정 */
    .formats-section .format-grid .format-group:last-child {
        grid-column: span 2;
    }

    /* Social Media 패널 내부 뱃지들을 중앙 정렬하고 가독성 최적화 */
    .formats-section .format-grid .format-group:last-child .format-badges,
    .formats-section .format-grid .format-group:last-child .format-badges-extended {
        justify-content: center;
        max-width: 800px;
        margin: 0 auto;
    }
}

/* 웹 화면에서는 변환 모달 format 옵션을 5개씩 표시 */
@media (min-width: 845px) {
    #conversionModal .format-grid,
    #formatOptions .format-grid,
    #conversionModal #formatOptions,
    .format-group .format-grid {
        grid-template-columns: repeat(5, 1fr) !important;
        gap: 0.7rem !important;
        display: grid !important;
        width: fit-content !important;
        margin: 0 auto !important;
        padding: 0 1.5rem !important;
        justify-content: center !important;
        box-sizing: border-box !important;
    }

    /* 웹에서 확장자 뱃지를 카테고리 버튼과 동일한 크기로 설정 */
    #conversionModal .format-badge,
    #formatOptions .format-badge,
    .format-options .format-badge {
        padding: 0.7rem 1rem !important;
        font-size: 0.9rem !important;
        min-height: 44px !important;
        font-weight: 600 !important;
        min-width: 85px !important;
        border-radius: 10px !important;
        border: 2px solid var(--border-color) !important;
        transition: all 0.2s ease !important;
    }

    #conversionModal .format-badge:hover,
    #formatOptions .format-badge:hover,
    .format-options .format-badge:hover {
        transform: translateY(-2px) !important;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1) !important;
    }
}

/* 아이폰 크기(390x844)에서 확장자 버튼을 카테고리 버튼과 동일하게 설정 */
@media (max-width: 844px) and (max-height: 900px) {
    #conversionModal .format-badge,
    #formatOptions .format-badge,
    .format-options .format-badge {
        padding: 0.4rem 0.6rem !important;
        font-size: 0.7rem !important;
        min-height: 36px !important;
        font-weight: 500 !important;
        min-width: 65px !important;
        border-radius: 8px !important;
        border: 2px solid var(--border-color) !important;
        width: auto !important;
        flex: none !important;
    }

    /* 아이폰에서 그리드 간격도 카테고리와 동일하게 */
    #conversionModal .format-grid,
    #formatOptions .format-grid {
        gap: 0.3rem !important;
    }
}

/* 아이폰 및 작은 모바일 화면에서 메인 페이지만 한 줄에 1개씩 표시 */
@media (max-width: 767px) {
    .formats-section .format-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem;
    }

    /* Conversion Settings 모달에서는 한 줄에 3개씩으로 변경 */
    #conversionModal .format-grid,
    #formatOptions .format-grid,
    .format-group .format-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
        gap: 0.5rem !important;
        display: grid !important;
        padding: 0 !important;
        box-sizing: border-box !important;
        width: 100% !important;
        margin: 0 auto !important;
        max-width: 100% !important;
        min-width: 0 !important;
    }

    /* 개별 format-badge들도 명확히 설정 - 모바일에서도 카테고리 버튼과 동일한 크기 */
    #conversionModal .format-badge,
    #formatOptions .format-badge,
    .format-options .format-badge {
        width: 100% !important;
        min-width: 85px !important;
        flex: 1 1 0% !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        box-sizing: border-box !important;
        padding: 0.75rem 1rem !important;
        font-size: 0.9rem !important;
        min-height: 48px !important;
        font-weight: 500 !important;
        border-radius: 8px !important;
        border: 2px solid var(--border-color) !important;
        transition: all 0.2s ease !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }

    #conversionModal .format-badge:active,
    #formatOptions .format-badge:active,
    .format-options .format-badge:active {
        transform: scale(0.95) !important;
    }
}


.format-group h4 {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.format-group h4 i {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8, #1e40af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
}

.format-badges {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 기본 2열 */
    gap: 0.5rem;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* 820px 이상에서 뱃지 3열 */
@media (min-width: 820px) {
    .format-badges {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 1024px 이상(iPad Pro 이상)에서 뱃지 4열 */
@media (min-width: 1024px) {
    .format-badges {
        grid-template-columns: repeat(4, 1fr);
    }
}

.supported-format-badge {
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    text-align: center;
    transition: transform 0.3s ease;
    white-space: nowrap;
    min-width: 0;
    box-sizing: border-box;
}

.supported-format-badge:hover {
    transform: translateY(-2px);
}

.supported-format-badge.video {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3B82F6;
}

.supported-format-badge.audio {
    background-color: rgba(236, 72, 153, 0.15);
    color: #EC4899;
}

.supported-format-badge.image {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10B981;
}

.supported-format-badge.document {
    background-color: rgba(245, 158, 11, 0.15);
    color: #F59E0B;
}

.supported-format-badge.social {
    background-color: rgba(99, 102, 241, 0.15);
    color: #6366F1;
}

.supported-format-badge.data {
    background-color: rgba(234, 179, 8, 0.15);
    color: #EAB308;
}

.supported-format-badge.archive {
    background-color: rgba(168, 85, 247, 0.15);
    color: #A855F7;
}

body[data-theme="dark"] .supported-format-badge.video {
    background-color: rgba(96, 165, 250, 0.15);
    color: #93C5FD;
}

body[data-theme="dark"] .supported-format-badge.audio {
    background-color: rgba(244, 114, 182, 0.15);
    color: #F9A8D4;
}

body[data-theme="dark"] .supported-format-badge.image {
    background-color: rgba(52, 211, 153, 0.15);
    color: #6EE7B7;
}

body[data-theme="dark"] .supported-format-badge.document {
    background-color: rgba(251, 191, 36, 0.15);
    color: #FCD34D;
}

body[data-theme="dark"] .supported-format-badge.social {
    background-color: rgba(129, 140, 248, 0.15);
    color: #A5B4FC;
}

body[data-theme="dark"] .supported-format-badge.data {
    background-color: rgba(250, 204, 21, 0.15);
    color: #FDE047;
}

body[data-theme="dark"] .supported-format-badge.archive {
    background-color: rgba(192, 132, 252, 0.15);
    color: #C084FC;
}


/* Extended Format Badges */
.supported-format-badges-extended,
.format-badges-extended {
    display: none; /* 기본적으로 숨김 */
    grid-template-columns: repeat(2, 1fr); /* 기본 모바일 2열 */
    gap: 0.5rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* transition, max-height, overflow, opacity 모두 제거 - 즉시 표시 */
}

/* 820px 이상에서 확장 뱃지도 3열 */
@media (min-width: 820px) {
    .supported-format-badges-extended,
    .format-badges-extended {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 1024px 이상(iPad Pro 이상)에서 확장 뱃지도 4열 */
@media (min-width: 1024px) {
    .supported-format-badges-extended,
    .format-badges-extended {
        grid-template-columns: repeat(4, 1fr);
    }
}

.format-group.expanded .format-badges-extended {
    display: grid !important; /* 확장 시 즉시 grid 표시 */
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Format Group Hover Effect */
.format-group {
    padding: 1.5rem;
    border-radius: 12px;
    background: var(--card-background);
    border: 1px solid transparent;
    overflow: visible; /* hidden → visible로 변경 */
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    /* transition 제거 - 브라우저 깨짐 방지 */
}

body[data-theme="dark"] .format-group {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.format-group:hover {
    border-color: var(--border-color);
    /* transform 제거 - 성능 최적화 */
    box-shadow: var(--shadow);
}

.format-group.expanded {
    border-color: var(--primary-color);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.15);
}

/* Mobile Responsive Fixes */
@media (max-width: 768px) {
    .formats-section .format-badge,
    .formats-section .format-badges-extended .format-badge {
        min-height: 44px;
        padding: 0.6rem 0.8rem;
        font-size: 0.85rem;
        border-radius: 8px;
    }

    .format-badges,
    .format-badges-extended {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.4rem;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .format-group {
        padding: 1rem;
    }


}

@media (max-width: 480px) {
    .formats-section .format-badge,
    .formats-section .format-badges-extended .format-badge {
        min-height: 42px;
        padding: 0.55rem 0.75rem;
        font-size: 0.8rem;
        border-radius: 8px;
    }

    .format-badges,
    .format-badges-extended {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.3rem;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .format-group {
        padding: 0.8rem;
    }

    .format-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }


}

/* Usage Guide Section */
.usage-guide-section {
    margin-top: 60px;
    text-align: center;
}

.usage-guide-section .section-description {
    color: var(--light-text-color);
    max-width: 800px;
    margin: 0 auto 40px auto;
    margin-top: 10px;
}

.guide-steps {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    text-align: left;
}

.step {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

body[data-theme="dark"] .step {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

/* .step:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
} */

.step-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8, #1e40af);
    color: #fff;
    font-weight: bold;
    font-size: 1rem;
    margin-right: 17px;
}

/* Step Illustrations */
.step-illustration {
    width: 100%;
    height: 220px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    border-radius: 12px;
    padding: 25px;
    box-sizing: border-box;
    margin-bottom: 15px;
    position: relative;
    overflow: hidden;
}

/* Upload Step */
.step-upload .upload-area {
    text-align: center;
    position: relative;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 15px;
    box-sizing: border-box;
}

.upload-icon {
    font-size: 2.2rem;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    display: block;
}

.file-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin: 8px 0 12px 0;
}

.file-icon {
    font-size: 1rem;
    color: #6b7280;
    opacity: 0.7;
}

.upload-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
    margin: 8px 0 0 0;
    line-height: 1.2;
}

/* Format Step */
.step-format .format-modal {
    background: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    padding: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    width: 100%;
    max-width: 260px;
}

body[data-theme="dark"] .step-format .format-modal {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(55, 65, 81, 0.4);
}

.format-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    margin-bottom: 10px;
}

.format-btn {
    padding: 5px 8px;
    border: 1px solid #e2e8f0;
    background: #f8fafc;
    border-radius: 5px;
    font-size: 0.7rem;
    font-weight: 500;
    color: #475569;
    cursor: pointer;
    transition: all 0.2s ease;
}

.format-btn.active {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border-color: #3b82f6;
}

.format-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: #475569;
    margin: 0;
}

/* Download Step */
.step-download {
    flex-direction: column;
    gap: 10px;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.progress-container {
    width: 100%;
    text-align: center;
}

.progress-bar {
    width: 160px;
    height: 5px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
    margin: 0 auto 6px;
}

.progress-fill {
    width: 80%;
    height: 100%;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border-radius: 3px;
    animation: progressPulse 2s ease-in-out infinite;
}

@keyframes progressPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

.progress-text {
    font-size: 0.75rem;
    font-weight: 600;
    color: #475569;
    margin: 0;
}

.download-btn {
    padding: 8px 16px;
    background: linear-gradient(45deg, #2563EB, #3b82f6, #60a5fa);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 5px;
    margin: 0 auto;
    transition: all 0.3s ease;
}

.download-btn:hover {
    background: linear-gradient(45deg, #1d4ed8, #2563EB, #3b82f6);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.download-text {
    font-size: 0.75rem;
    font-weight: 600;
    color: #475569;
    margin: 0;
}

.step-image-container {
    width: 100%;
    aspect-ratio: 16 / 10;
    border-radius: 12px;
    margin-bottom: 20px;
    overflow: hidden;
}

.step-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background-color: #f9fafb;
}

.step h4 {
    font-size: 1.25rem;
    color: var(--text-color);
    text-align: left;
    margin: 0;
    margin-left: 10px;
}

.step p {
    font-size: 0.95rem;
    color: var(--light-text-color);
    line-height: 1.6;
}

.terms-notice {
    font-size: 0.75rem;
    color: var(--light-text-color);
    text-align: center;
    margin-top: 0.75rem;
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.terms-notice a {
    color: inherit;
    text-decoration: underline;
    cursor: pointer;
    transition: opacity 0.3s ease;
}

.terms-notice a:hover {
    opacity: 0.7;
    text-decoration: underline;
}

.terms-notice a:visited {
    color: inherit;
}

/* 확장 버튼 스타일 */
.expand-formats-btn {
    display: block;
    width: 32px;
    height: 32px;
    border: 2px solid var(--primary-color);
    background: transparent;
    border-radius: 8px;
    color: var(--primary-color);
    cursor: pointer;
    margin: 1rem auto 0 auto;
    transition: all 0.3s ease;
    font-size: 14px;
    position: relative;
}

.expand-formats-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.expand-formats-btn.expanded {
    transform: rotate(45deg);
}

.expand-formats-btn.expanded:hover {
    transform: rotate(45deg) translateY(-2px);
}

/* Sitemap */
.sitemap {
    margin-top: 60px;
    color: var(--light-text-color);
    padding: 3rem 0 2rem 0;
    border-top: 1px solid var(--border-color);
    opacity: 1;
}

.sitemap-content {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    padding: 0 2rem;
    align-items: center;
}

.sitemap-top {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.sitemap-top .hqmx-brand h1 {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-color);
    margin: 0;
    opacity: 1;
}

.sitemap-top .hqmx-brand .logo-x {
    background: linear-gradient(45deg, #8249fe, #5374f4, #2ab2f3);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sitemap-tagline {
    font-size: 0.8rem;
    color: var(--light-text-color);
    letter-spacing: 12px;
    margin: 0;
    margin-top: 1rem;
}

.sitemap-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 800px;
}

.sitemap-center {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.sitemap-side {
    flex-shrink: 0;
}

.sitemap-left {
    text-align: left;
}

.sitemap-right {
    text-align: right;
}

.sitemap-side .converter-logo .converter-text,
.sitemap-side .downloader-logo .downloader-text {
    font-size: 1.5rem;
}

.sitemap-side .downloader-logo .downloader-d {
    font-size: 0.95em;
}

/* Sitemap Logo Links */
.hqmx-brand-link,
.logo-link {
    text-decoration: none;
    color: inherit;
    display: inline-block;
    transition: all 0.3s ease;
}

.hqmx-brand-link:hover,
.logo-link:hover {
    transform: translateY(-3px);
    opacity: 0.8;
}

.hqmx-brand-link:active,
.logo-link:active {
    transform: translateY(-1px);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--light-text-color);
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
}

footer p {
    margin: 0;
    font-size: 0.85rem;
    opacity: 0.9;
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--light-text-color);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    text-align: center;
}

.footer-info p {
    margin: 0;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.footer-twitter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 8px;
    border-radius: 50%;
    background-color: var(--bg-secondary);
    transition: all 0.3s ease;
}

.footer-twitter:hover {
    transform: translateY(-3px);
    background-color: var(--primary-color);
}

.footer-social-icon {
    width: 20px;
    height: 20px;
    display: block;
}

/* 다크모드에서 아이콘 흰색으로 */
body.dark-mode .footer-social-icon {
    filter: brightness(0) invert(1);
}

/* 라이트모드에서 아이콘 어둡게 */
body:not(.dark-mode) .footer-social-icon {
    filter: brightness(0) invert(0.3);
}

/* Sitemap & Footer Mobile Responsive */
@media (max-width: 768px) {
    .sitemap-content {
        gap: 1.5rem;
        padding: 0 1rem;
    }

    .sitemap-tagline {
        letter-spacing: 4px;
        margin: 0.5rem 0;
    }

    .sitemap-bottom {
        max-width: 100%;
        padding: 0 1rem;
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .sitemap-left,
    .sitemap-right {
        text-align: center;
    }

    .sitemap-side .converter-logo .converter-text,
    .sitemap-side .downloader-logo .downloader-text {
        font-size: 1.3rem;
    }
}

@media (max-width: 480px) {
    .sitemap-tagline {
        letter-spacing: 6px;
    }

    .sitemap-bottom {
        padding: 0;
    }

    .sitemap-side .converter-logo .converter-text,
    .sitemap-side .downloader-logo .downloader-text {
        font-size: 1.1rem;
    }
}

body[data-theme="dark"] select,
body[data-theme="dark"] input {
    background-color: #374151;
    border-color: #4b5563;
    color: var(--text-color);
}

/* 태블릿용 2열 그리드 */
@media (max-width: 1024px) and (min-width: 769px) {
    .guide-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 0.5rem;
        gap: 1rem;
    }

    .top-nav {
        margin: -1rem -0.5rem 1rem -0.5rem;
        padding: 1rem;
    }

    .nav-center {
        display: none;
    }

    .nav-left {
        gap: 0.5rem;
    }

    .converter-logo .converter-text {
        font-size: 1.4rem;
    }

    .hqmx-brand h1 {
        font-size: 1rem;
    }

    .upload-zone {
        padding: 1.5rem 0.75rem;
    }

    .format-categories {
        justify-content: center;
    }

    #conversionModal .format-grid,
    #formatOptions .format-grid {
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 0.5rem !important;
    }

    .batch-actions {
        flex-direction: column;
    }

    .modal-content {
        width: 95%;
        margin: 1rem;
    }

    .format-grid {
        grid-template-columns: 1fr;
    }

    .guide-steps {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        gap: 1rem;
        padding: 0 1rem;
    }

    .footer-left,
    .footer-right {
        align-self: center;
    }

    .footer-bottom {
        margin: 0 1rem;
    }
}

/* 햄버거 메뉴 스타일 */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 101;
}

.hamburger-menu span {
    display: block;
    height: 2px;
    width: 100%;
    background: var(--text-color);
    border-radius: 1px;
    transition: all 0.3s ease;
}

.hamburger-menu.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-menu.active span:nth-child(2) {
    opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 모바일 메뉴 오버레이 */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.mobile-menu-overlay.show {
    opacity: 1;
    visibility: visible;
}

.mobile-menu-box {
    position: fixed;
    top: 5rem;
    right: -320px;
    width: 280px;
    max-width: 85vw;
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 16px;
    padding: 1.5rem 1rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    z-index: 1002;
    isolation: isolate;
    will-change: transform;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body[data-theme="dark"] .mobile-menu-box {
    backdrop-filter: blur(30px) saturate(180%);
    -webkit-backdrop-filter: blur(30px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-menu-overlay.show .mobile-menu-box {
    right: 1.5rem;
}


/* 모바일 메뉴 링크 컨테이너 */
.mobile-menu-links {
    display: block;
    width: 100%;
    padding: 0.5rem 0;
    border-bottom: 2px solid rgba(0, 0, 0, 0.1);
    margin-bottom: 1rem;
}

[data-theme="dark"] .mobile-menu-links {
    border-bottom-color: rgba(55, 65, 81, 0.8);
}

.mobile-nav-link {
    display: block;
    color: #000000;
    text-decoration: none;
    font-weight: 500;
    padding: 1rem 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    transition: color 0.3s ease;
    text-align: center;
}

.mobile-nav-link:last-child {
    border-bottom: none;
}

.mobile-nav-link:hover {
    color: var(--primary-color);
}

.mobile-nav-link.active {
    color: var(--primary-color);
    font-weight: 700;
}

[data-theme="dark"] .mobile-nav-link {
    border-bottom-color: rgba(55, 65, 81, 0.8);
    color: #ffffff;
}

/* 모바일 메뉴 컨트롤 */
.mobile-menu-controls {
    display: block !important;
    visibility: visible !important;
}

[data-theme="dark"] .mobile-menu-controls {
    border-top-color: rgba(55, 65, 81, 0.8);
}

.mobile-control-item {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    visibility: visible !important;
    opacity: 1 !important;
}

.mobile-control-item.menu-divider {
    flex-direction: column;
    gap: 0.5rem;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    justify-content: center;
    align-items: center;
}

[data-theme="dark"] .mobile-control-item.menu-divider {
    border-top-color: rgba(55, 65, 81, 0.8);
}

.control-label {
    font-weight: 500;
    color: #000000;
    font-size: 0.95rem;
}

[data-theme="dark"] .control-label {
    color: #ffffff;
}

.mobile-theme-toggle-btn {
    background: var(--card-background);
    border: 1px solid var(--border-color);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9rem;
    box-shadow: none;
    transition: all 0.3s ease;
    overflow: hidden;
    position: relative;
    z-index: 10;
}

.mobile-theme-toggle-btn .fa-sun {
    color: #f59e0b;
    transition: all 0.3s ease;
}

.mobile-theme-toggle-btn .fa-moon {
    color: #6366f1;
    transition: all 0.3s ease;
    position: absolute;
    opacity: 0;
    transform: rotate(90deg);
}

[data-theme="dark"] .mobile-theme-toggle-btn .fa-sun {
    opacity: 0;
    transform: rotate(-90deg);
}

[data-theme="dark"] .mobile-theme-toggle-btn .fa-moon {
    opacity: 1;
    transform: rotate(0deg);
}

.mobile-language-selector-btn {
    background: var(--card-background);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0 0.6rem;
    height: 30px;
    border-radius: 15px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
    font-size: 0.8rem;
    font-weight: 500;
    box-shadow: none;
    transition: all 0.3s ease;
    position: relative;
    z-index: 10;
}

.mobile-language-options {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    z-index: 1001;
    max-height: 200px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    margin-top: 0.5rem;
    min-width: 150px;
}

.mobile-language-options.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.mobile-language-options a {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.85rem;
    transition: background-color 0.3s ease;
    border-bottom: 1px solid var(--border-color);
}

.mobile-language-options a:last-child {
    border-bottom: none;
}

.mobile-language-options a:hover {
    background: var(--hover-color);
}

@media (max-width: 768px) {
    .nav-center .hamburger-menu {
        display: flex !important;
    }

    .nav-center .nav-menu {
        display: none !important;
    }

    .top-nav .nav-right {
        display: none !important;
    }

    .mobile-menu-overlay {
        display: block !important;
    }

    .top-nav .nav-center {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        padding-right: 1rem;
    }

}

@media (max-width: 480px) {
    body {
        padding: 4rem 0.5rem 0.5rem 0.5rem;
        margin: 0 auto;
        max-width: 100vw;
        overflow-x: hidden;
        background-image: none !important;
        background-attachment: unset;
    }

    /* 모바일에서 배경 이미지를 position: fixed로 고정 */
    body::before {
        background-image:
            linear-gradient(rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.1)),
            url('assets/mbg.webp');
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        width: 100vw;
        height: 100vh;
    }

    body[data-theme="dark"]::before {
        background-image:
            linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.4)),
            url('assets/dkmbg.webp');
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
    }

    .container {
        margin: 0 auto;
        text-align: center;
    }

    .section {
        margin: 0 auto;
    }

    .top-nav {
        margin: -0.5rem -0.5rem 1rem -0.5rem;
        padding: 0.75rem;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        backdrop-filter: blur(0px);
        -webkit-backdrop-filter: blur(0px);
    }

    /* 모바일 스크롤 시 blur 효과 */
    .top-nav.scrolled {
        backdrop-filter: blur(1px);
        -webkit-backdrop-filter: blur(1px);
    }

    .converter-logo .converter-text {
        font-size: 1.6rem;
    }

    .hqmx-brand h1 {
        font-size: 0.9rem;
    }

    .format-badges {
        grid-template-columns: repeat(2, 1fr);
    }

    .upload-zone {
        padding: 1rem 0.5rem;
    }

    .upload-text .main-text {
        font-size: 1rem;
    }

    .upload-icon {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }

    .upload-text .sub-text {
        font-size: 0.8rem;
        margin-bottom: 1rem;
    }

    .main-content {
        gap: 0.6rem;
    }

    .main-content section {
        padding: 0.6rem;
    }
}

/* RTL-specific styles */
body[dir="rtl"] {
    text-align: right;
}

body[dir="rtl"] .header-controls {
    right: auto;
    left: 0;
}

body[dir="rtl"] .language-options {
    right: auto;
    left: 0;
}

body[dir="rtl"] .file-preview,
body[dir="rtl"] .file-item {
    flex-direction: row-reverse;
}

body[dir="rtl"] .file-preview i,
body[dir="rtl"] .file-icon {
    margin-right: 0;
    margin-left: 3rem;
}

body[dir="rtl"] .step-number {
    margin-right: 0;
    margin-left: 17px;
}

body[dir="rtl"] .guide-steps {
    text-align: right;
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Status Indicators */
.status-converting {
    color: var(--warning-color);
}

.status-completed {
    color: var(--primary-color);
}

.status-error {
    color: var(--error-color);
}

/* Notification/Toast Styles */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    z-index: 3000;
    animation: slideInRight 0.3s ease;
    max-width: 400px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Conversion Settings 패널의 모든 버튼 크기 통일 */
@media (min-width: 845px) {
    /* Convert to 카테고리 버튼과 확장자 버튼 크기 통일 */
    #conversionModal .format-category,
    #conversionModal .format-badge,
    #formatOptions .format-badge,
    .format-options .format-badge {
        padding: 0.7rem 1rem !important;
        font-size: 0.85rem !important;
        min-height: 50px !important;
        font-weight: 500 !important;
        min-width: 90px !important;
        flex: 1 1 0% !important;
        width: 100% !important;
        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
        border-radius: 8px !important;
        border: 2px solid var(--border-color) !important;
        transition: all 0.3s ease !important;
        text-align: center !important;
        gap: 0.5rem !important;
    }

    /* 선택된 카테고리 버튼 스타일 */
    #conversionModal .format-category.active {
        background: var(--primary-color) !important;
        border-color: var(--primary-color) !important;
        color: white !important;
        box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.3) !important;
        border-radius: 8px !important;
    }

    /* 웹 다크모드에서 선택된 카테고리 버튼 강화 */
    body[data-theme="dark"] #conversionModal .format-category.active {
        background: rgba(0, 0, 0, 0.8) !important;
        border: 2px solid var(--primary-color) !important;
        color: white !important;
        box-shadow: none !important;
        border-radius: 8px !important;
    }

    /* 선택된 확장자 버튼에 파란색 그라데이션 효과 */
    #conversionModal .format-badge.selected,
    #formatOptions .format-badge.selected {
        background: linear-gradient(45deg, var(--primary-color), var(--secondary-color)) !important;
        border: 2px solid transparent !important;
        color: white !important;
        transform: translateY(-2px) scale(1.02) !important;
        box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4) !important;
        backdrop-filter: none !important;
        position: relative !important;
        z-index: 1 !important;
        border-radius: 8px !important;
        overflow: visible !important;
    }

    /* 웹 다크모드에서 선택된 확장자 버튼 */
    body[data-theme="dark"] #conversionModal .format-badge.selected,
    body[data-theme="dark"] #formatOptions .format-badge.selected {
        background: rgba(0, 0, 0, 0.8) !important;
        border: 2px solid var(--primary-color) !important;
        color: white !important;
        box-shadow: none !important;
        border-radius: 8px !important;
        transform: translateY(-2px) scale(1.02) !important;
    }

    /* 그리드 간격 통일 및 모달 패딩 조정 - 카테고리와 동일한 간격 */
    #conversionModal .format-categories {
        gap: 0.5rem !important;
        justify-content: center !important;
        margin-left: auto !important;
        margin-right: auto !important;
        width: fit-content !important;
        margin-bottom: 2.5rem !important;
    }

    #conversionModal .format-grid,
    #formatOptions .format-grid {
        gap: 0.3rem !important;
        justify-content: center !important;
        margin-left: auto !important;
        margin-right: auto !important;
        width: fit-content !important;
    }

    /* 모달 body 패딩 조정 - 선택된 버튼의 변형 효과를 위한 여유공간 확보 */
    #conversionModal .modal-body {
        padding: 2.5rem 1.2rem 2rem 1.2rem !important;
    }
}

/* ==========================================
   Conversion Page Specific Styles
   ========================================== */

/* Conversion Indicator - Format Badges */
.conversion-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--card-background);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.conversion-format-badge {
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 700;
    font-size: 18px;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.conversion-format-badge:hover {
    transform: scale(1.05);
}

.conversion-format-badge.from {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.conversion-format-badge.to {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

/* Dark mode adjustments */
body[data-theme="dark"] .conversion-indicator {
    background: rgba(0, 0, 0, 0.4);
}

/* Related Conversions Section */
.related-conversions-section {
    margin-top: 3rem;
    padding: 2rem 0;
}

.related-conversions-section h3 {
    text-align: center;
    margin-bottom: 2rem;
    color: var(--text-color);
    font-size: 2rem;
}

.related-conversions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    max-width: 1000px;
    margin: 0 auto;
}

.related-conversion-card {
    background: var(--card-background);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.related-conversion-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary-color);
}

.related-conversion-card .conversion-path {
    font-weight: 600;
    font-size: 1.1rem;
}

.related-conversion-card.all-formats {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
}

.related-conversion-card.all-formats:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
}

/* Conversion Confirmation in Modal */
.conversion-confirmation {
    padding: 1.5rem;
    background: var(--card-background);
    border-radius: var(--border-radius);
    text-align: center;
    border: 2px solid var(--primary-color);
}

.conversion-confirmation p {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

/* Mobile responsiveness */
@media (max-width: 768px) {
    .conversion-indicator {
        padding: 15px;
        gap: 10px;
    }

    .format-badge {
        padding: 10px 18px;
        font-size: 16px;
    }

    .related-conversions-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   Feature Flags - Social Media 비활성화
   ======================================== */
/* Social Media 카테고리 버튼 숨김 */
#socialCategoryBtn {
    display: none !important;
}

/* Social Media 섹션 숨김 */
#socialMediaSection {
    display: none !important;
}

/* ========================================
   헤더 네비게이션 메뉴 활성화됨 (2025-11-01)
   ======================================== */
/* 데스크톱 네비게이션 메뉴 활성화 */
/* .nav-menu {
    display: none !important;
} */

/* 햄버거 메뉴 버튼 활성화 */
/* .hamburger-menu {
    display: none !important;
} */

/* 모바일 메뉴 오버레이 활성화 */
/* .mobile-menu-overlay {
    display: none !important;
} */

/* ========================================
   Supported Conversions Section
   ======================================== */

.supported-conversions {
    margin-top: 0;
    padding: 0;
    background: transparent;
}

.supported-conversions h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    text-align: center;
}

.sitemap-title {
    font-size: 1.2rem !important;
    font-weight: 600 !important;
    color: var(--text-secondary) !important;
}

.sitemap-expand-btn {
    display: block;
    width: 32px;
    height: 32px;
    border: 2px solid var(--primary-color);
    background: transparent;
    border-radius: 8px;
    color: var(--primary-color);
    cursor: pointer;
    margin: 0.5rem auto 0 auto;
    transition: all 0.3s ease;
    font-size: 14px;
    position: relative;
}

.sitemap-expand-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.sitemap-expand-btn.expanded {
    transform: rotate(45deg);
}

.sitemap-expand-btn.expanded:hover {
    transform: rotate(45deg) translateY(-2px);
}

/* 기본적으로 배지 컨테이너 숨김 */
.conversion-category .conversion-badges-container {
    display: none;
}

/* 확장 상태일 때만 배지 컨테이너 표시 */
.conversion-category.show-badges .conversion-badges-container {
    display: block;
}

.supported-conversions .section-description {
    text-align: center;
    color: var(--light-text-color);
    font-size: 0.85rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
}

/* Conversion Category */
.conversion-category {
    margin-bottom: 1.5rem;
    overflow: hidden;
    background: transparent;
}

/* Category Header */
.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    transition: background 0.3s ease;
    user-select: none;
}

.category-header:hover {
    background: rgba(37, 99, 235, 0.05);
}

.category-title-wrapper {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.category-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.category-header h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.badge-count {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color);
    color: white;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* Expand Button */
.expand-btn {
    background: none;
    border: 2px solid var(--border-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--text-color);
    flex-shrink: 0;
}

.expand-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.expand-btn i {
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.category-header.expanded .expand-btn i {
    transform: rotate(45deg);
}

/* Category Icons Navigation */
.category-icons-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: -2.8rem 0 0.5rem 0;
    flex-wrap: wrap;
}

.category-icon-btn {
    width: 60px;
    height: 60px;
    border: 2px solid var(--border-color);
    background: var(--card-bg);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon-btn i {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.category-icon-btn:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(var(--primary-color-rgb), 0.2);
}

.category-icon-btn:hover i {
    color: var(--primary-color);
}

.category-icon-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: var(--primary-color);
    box-shadow: 0 4px 16px rgba(var(--primary-color-rgb), 0.3);
}

.category-icon-btn.active i {
    color: white;
}

/* 카테고리별 아이콘 색상 (라이트 모드) */
.category-icon-btn[data-category="cross-category"]:not(.active) {
    border-color: rgba(239, 68, 68, 0.3);
}
.category-icon-btn[data-category="cross-category"]:not(.active) i {
    color: #EF4444;
}

.category-icon-btn[data-category="video"]:not(.active) {
    border-color: rgba(59, 130, 246, 0.3);
}
.category-icon-btn[data-category="video"]:not(.active) i {
    color: #3B82F6;
}

.category-icon-btn[data-category="image"]:not(.active) {
    border-color: rgba(16, 185, 129, 0.3);
}
.category-icon-btn[data-category="image"]:not(.active) i {
    color: #10B981;
}

.category-icon-btn[data-category="audio"]:not(.active) {
    border-color: rgba(236, 72, 153, 0.3);
}
.category-icon-btn[data-category="audio"]:not(.active) i {
    color: #EC4899;
}

.category-icon-btn[data-category="document"]:not(.active) {
    border-color: rgba(245, 158, 11, 0.3);
}
.category-icon-btn[data-category="document"]:not(.active) i {
    color: #F59E0B;
}

.category-icon-btn[data-category="archive"]:not(.active) {
    border-color: rgba(168, 85, 247, 0.3);
}
.category-icon-btn[data-category="archive"]:not(.active) i {
    color: #A855F7;
}

/* 카테고리별 아이콘 색상 (다크 모드) */
body[data-theme="dark"] .category-icon-btn[data-category="cross-category"]:not(.active) {
    border-color: rgba(248, 113, 113, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="cross-category"]:not(.active) i {
    color: #F87171;
}

body[data-theme="dark"] .category-icon-btn[data-category="video"]:not(.active) {
    border-color: rgba(147, 197, 253, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="video"]:not(.active) i {
    color: #93C5FD;
}

body[data-theme="dark"] .category-icon-btn[data-category="image"]:not(.active) {
    border-color: rgba(110, 231, 183, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="image"]:not(.active) i {
    color: #6EE7B7;
}

body[data-theme="dark"] .category-icon-btn[data-category="audio"]:not(.active) {
    border-color: rgba(249, 168, 212, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="audio"]:not(.active) i {
    color: #F9A8D4;
}

body[data-theme="dark"] .category-icon-btn[data-category="document"]:not(.active) {
    border-color: rgba(252, 211, 77, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="document"]:not(.active) i {
    color: #FCD34D;
}

body[data-theme="dark"] .category-icon-btn[data-category="archive"]:not(.active) {
    border-color: rgba(192, 132, 252, 0.3);
}
body[data-theme="dark"] .category-icon-btn[data-category="archive"]:not(.active) i {
    color: #C084FC;
}

/* Conversion Category */
.conversion-category {
    display: none;
}

.conversion-category.active {
    display: block;
}

/* Conversion Badges Container */
.conversion-badges-container {
    padding: 0 1.5rem 1.5rem 1.5rem;
}

/* Conversion Subcategory */
.conversion-subcategory {
    margin-bottom: 2rem;
    position: relative;
}

.conversion-subcategory:last-child {
    margin-bottom: 0;
}

/* Show More Button */
.show-more-conversions-btn {
    display: block;
    width: 32px;
    height: 32px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    margin: 1rem auto 0;
    transition: all 0.3s ease;
    font-size: 14px;
    font-weight: bold;
}

.show-more-conversions-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.show-more-conversions-btn.expanded {
    transform: rotate(45deg);
}

.show-more-conversions-btn.expanded:hover {
    transform: rotate(45deg) translateY(-2px);
}

.conversion-subcategory h5 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.conversion-subcategory h5 i {
    color: var(--primary-color);
}

/* Conversion Badges Grid */
.conversion-badges {
    display: grid;
    grid-template-columns: repeat(3, 1fr); /* 모바일: 3열 */
    gap: 0.5rem;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* 768px 이상(태블릿)에서 뱃지 6열 */
@media (min-width: 768px) {
    .conversion-badges {
        grid-template-columns: repeat(6, 1fr);
    }
}

/* 1024px 이상(데스크톱)에서 뱃지 8열 */
@media (min-width: 1024px) {
    .conversion-badges {
        grid-template-columns: repeat(8, 1fr);
    }
}

/* Conversion Badge (Supported Format Style) */
.conversion-badge {
    position: relative;
    height: 32px;
    text-decoration: none;
    display: block;
    border-radius: 8px;
    font-size: 0.7rem;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
    overflow: hidden;
    white-space: nowrap;
    min-width: 0;
    box-sizing: border-box;
}

/* Hidden badges (for show more functionality) */
.conversion-badge.hidden {
    display: none;
}

.conversion-badge:hover {
    transform: translateY(-2px);
}

.badge-front,
.badge-back {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.3s ease, transform 0.3s ease;
    letter-spacing: 0.05em;
    word-spacing: 0.2em;
}

.badge-front {
    opacity: 1;
    transform: translateX(0);
}

.badge-back {
    opacity: 0;
    transform: translateX(100%);
}

.conversion-badge:hover .badge-front {
    opacity: 0;
    transform: translateX(-100%);
}

.conversion-badge:hover .badge-back {
    opacity: 1;
    transform: translateX(0);
}

/* 단방향 변환 뱃지 - 회전 애니메이션 제거 */
.conversion-badge.unidirectional:hover {
    transform: translateY(-2px); /* 살짝 올라가는 효과만 유지 */
}

.conversion-badge.unidirectional:hover .badge-front {
    opacity: 1; /* 앞면 유지 */
    transform: translateX(0); /* 좌우 이동 제거 */
}

.conversion-badge.unidirectional:hover .badge-back {
    opacity: 0; /* 뒷면 숨김 */
    transform: translateX(100%); /* 원래 위치 유지 */
}

/* 카테고리별 뱃지 색상 (라이트 모드) */
/* Cross-Category - Red/Fire */
.conversion-category[data-category="cross-category"] .conversion-badge {
    background-color: rgba(239, 68, 68, 0.15);
    color: #EF4444;
}

/* Video - Blue */
.conversion-category[data-category="video"] .conversion-badge {
    background-color: rgba(59, 130, 246, 0.15);
    color: #3B82F6;
}

/* Image - Green */
.conversion-category[data-category="image"] .conversion-badge {
    background-color: rgba(16, 185, 129, 0.15);
    color: #10B981;
}

/* Audio - Pink */
.conversion-category[data-category="audio"] .conversion-badge {
    background-color: rgba(236, 72, 153, 0.15);
    color: #EC4899;
}

/* Document - Orange */
.conversion-category[data-category="document"] .conversion-badge {
    background-color: rgba(245, 158, 11, 0.15);
    color: #F59E0B;
}

/* Archive - Purple */
.conversion-category[data-category="archive"] .conversion-badge {
    background-color: rgba(168, 85, 247, 0.15);
    color: #A855F7;
}

/* 카테고리별 뱃지 색상 (다크 모드) */
body[data-theme="dark"] .conversion-category[data-category="cross-category"] .conversion-badge {
    background-color: rgba(248, 113, 113, 0.15);
    color: #F87171;
}

body[data-theme="dark"] .conversion-category[data-category="video"] .conversion-badge {
    background-color: rgba(147, 197, 253, 0.15);
    color: #93C5FD;
}

body[data-theme="dark"] .conversion-category[data-category="image"] .conversion-badge {
    background-color: rgba(110, 231, 183, 0.15);
    color: #6EE7B7;
}

body[data-theme="dark"] .conversion-category[data-category="audio"] .conversion-badge {
    background-color: rgba(249, 168, 212, 0.15);
    color: #F9A8D4;
}

body[data-theme="dark"] .conversion-category[data-category="document"] .conversion-badge {
    background-color: rgba(252, 211, 77, 0.15);
    color: #FCD34D;
}

body[data-theme="dark"] .conversion-category[data-category="archive"] .conversion-badge {
    background-color: rgba(192, 132, 252, 0.15);
    color: #C084FC;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .supported-conversions {
        padding: 1.5rem;
    }

    .supported-conversions h3 {
        font-size: 1.5rem;
    }

    .category-header {
        padding: 1rem;
    }

    .category-header h4 {
        font-size: 1rem;
    }

    .badge-count {
        font-size: 0.65rem;
        padding: 0.2rem 0.5rem;
    }

    .conversion-badges {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.4rem;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .conversion-badge {
        height: 36px;
        font-size: 0.7rem;
    }

    .conversion-subcategory h5 {
        font-size: 1rem;
    }
}

/* 480px 이하 모바일 - 3열 유지 */
@media (max-width: 480px) {
    .conversion-badges {
        grid-template-columns: repeat(3, 1fr);
        gap: 0.35rem;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .conversion-badge {
        height: 32px;
        font-size: 0.65rem;
    }

    .category-icons-nav {
        display: grid;
        grid-template-columns: repeat(3, auto);
        grid-template-rows: repeat(2, 1fr);
        row-gap: 0.8rem;
        column-gap: 0.8rem;
        max-width: 100%;
        margin: -3.5rem auto 0.5rem auto;
        padding: 0 1rem;
        justify-content: center;
    }

    .category-icon-btn {
        margin: 0;
    }
}
/* ==================== 반응형 광고 배너 (Adsterra) ==================== */

/* 기본: 모든 배너 숨김 */
#banner-728x90,
#banner-468x60,
#banner-320x50 {
    display: none;
}

/* Desktop (728px 이상): 728x90만 표시 */
@media (min-width: 728px) {
    #banner-728x90 {
        display: block;
    }
}

/* Tablet (468px ~ 727px): 468x60만 표시 */
@media (min-width: 468px) and (max-width: 727px) {
    #banner-468x60 {
        display: block;
    }
}

/* Mobile (320px ~ 467px): 320x50만 표시 */
@media (min-width: 320px) and (max-width: 467px) {
    #banner-320x50 {
        display: block;
    }
}

/* 320px 미만: 모든 배너 숨김 (기본값 유지) */

/* 광고 컨테이너 중앙 정렬 */
#adsterra-banners {
    overflow: hidden;
}

.ad-banner {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 상태 표시 및 타이머 컨테이너 */
.file-status-container {
    display: flex;
    flex-wrap: nowrap; /* 타이머를 같은 줄에 강제 */
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 8px;
    width: 100%; /* 전체 너비 사용 */
}

.file-status {
    flex: 1;
    font-size: 13px;
    color: #6b7280;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-timer {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 13px;
    font-weight: 500;
    color: #4a9eff;
    white-space: nowrap;
    flex-shrink: 0;
}

/* 다크모드 타이머 스타일 */
[data-theme="dark"] .file-timer {
    color: #60a5fa;
}

/* 변환 중 로더 애니메이션 */
.conversion-loader {
    width: 17px;
    height: 17px;
    display: block;
    margin: 0 auto;
    position: relative;
    color: #FFF;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    cursor: pointer;
}

.conversion-loader::after,
.conversion-loader::before {
    content: '';
    box-sizing: border-box;
    position: absolute;
    width: 8.5px;
    height: 8.5px;
    top: 50%;
    left: 50%;
    transform: scale(0.5) translate(0, 0);
    background-color: #fbbf24;
    border-radius: 50%;
    animation: animloader 1s infinite ease-in-out;
}

.conversion-loader::before {
    background-color: var(--primary-color);
    transform: scale(0.5) translate(-17px, -17px);
}

/* 모바일에서 로더 크기 조정 (60% 크기) */
@media (max-width: 768px) {
    .conversion-loader {
        width: 14px;
        height: 14px;
    }

    .conversion-loader::after,
    .conversion-loader::before {
        width: 7px;
        height: 7px;
    }

    .conversion-loader::before {
        transform: scale(0.5) translate(-14px, -14px);
    }
}

@keyframes rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes animloader {
    50% {
        transform: scale(1) translate(-50%, -50%);
    }
}

/* 다크모드 로더 색상 조정 */
[data-theme="dark"] .conversion-loader::after {
    background-color: #ffffff;
}

[data-theme="dark"] .conversion-loader::before {
    background-color: var(--primary-color);
}

/* 삭제 확인 모달 */
.delete-confirm-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.2s ease;
}

.delete-confirm-content {
    background: var(--card-background);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 2rem;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow);
    animation: slideUp 0.3s ease;
}

.delete-confirm-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.delete-confirm-message {
    font-size: 0.95rem;
    color: var(--light-text-color);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.delete-confirm-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
}

.delete-confirm-btn {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.delete-confirm-btn.cancel {
    background: var(--border-color);
    color: var(--text-color);
}

.delete-confirm-btn.cancel:hover {
    background: #d1d5db;
}

.delete-confirm-btn.confirm {
    background: var(--error-color);
    color: white;
}

.delete-confirm-btn.confirm:hover {
    background: #dc2626;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* ==========================================
   FAQ Accordion Styles
   ========================================== */

.faq-item {
    border: none;
    border-radius: 0;
    margin-bottom: 12px;
    background: transparent;
    transition: all 0.3s ease;
}

.faq-item:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.faq-question {
    position: relative;
    padding: 16px 48px 16px 16px;
    margin: 0;
    user-select: none;
    transition: background-color 0.2s ease;
}

.faq-question:hover {
    background-color: var(--hover-bg);
}

.faq-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
    transition: transform 0.3s ease;
    color: var(--primary-color);
}

.faq-item.collapsed .faq-icon {
    transform: translateY(-50%) rotate(-90deg);
}

.faq-item p,
.faq-item ul {
    max-height: 1000px;
    overflow: hidden;
    opacity: 1;
    padding: 0 16px 16px 16px;
    transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.3s ease;
}

.faq-item.collapsed p,
.faq-item.collapsed ul {
    max-height: 0;
    opacity: 0;
    padding: 0 16px;
}

.faq-item ul {
    padding-left: 32px;
}

.faq-item .strong {
    font-weight: 600;
    color: var(--primary-color);
}

/* Category headings */
.guide-container h2 {
    margin-top: 40px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
    color: var(--heading-color);
}