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

:root {
    --primary-color: #2563EB;
    --secondary-color: #1D4ED8;
    --background-color: #f0f2f5;
    --card-background: rgba(255, 255, 255, 0.9);
    --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;
    --background-color: #111827;
    --card-background: #1f2937;
    --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-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 2rem;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
.header {
    text-align: center;
    position: relative;
}

.header-controls {
    position: absolute;
    top: 6.8rem;
    right: 0;
    display: flex;
    gap: 0.3rem;
}

.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 {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0; /* 아이콘이 사라졌으므로 gap 제거 */
    margin-bottom: 0.5rem;
}

.logo h1 {
    font-size: 3.5rem; /* 이미지와 비슷하게 크기 조정 */
    font-weight: 800; /* Extra-bold */
    letter-spacing: 0px; /* 자간을 살짝 좁게 */
    color: #111; /* 진한 검은색 */
}

body[data-theme="dark"] .logo h1 {
    color: #f9fafb; /* 다크모드일 때 로고 텍스트 색상 */
}

.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: 8px;
    margin-top: -1.2rem;
    margin-bottom: 1.5rem;
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* 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); }
}

/* URL Input Section */
.input-container {
    width: 100%;
}

.input-container h4 {
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 0.8rem;
    color: var(--text-color);
}

.input-wrapper {
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.25rem;
    transition: box-shadow 0.3s ease;
    outline: 3px solid #2ab2f3;
}

.input-wrapper:focus-within {
    box-shadow: 0 0 0 3px rgba(37, 117, 252, 0.3);
}

.input-icon {
    font-size: 1.2rem;
    color: var(--light-text-color);
    margin: 0 1rem;
}

#urlInput {
    flex-grow: 1;
    border: none;
    outline: none;
    padding: 0.75rem 0;
    font-size: 1rem;
    background: transparent;
}

.analyze-btn {
    border: none;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.analyze-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.analyze-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

/* --- Dark Mode Input Box Overrides --- */
body[data-theme="dark"] .input-wrapper {
    background-color: #ffffff;
    border-color: #dbdfe4;
}

body[data-theme="dark"] #urlInput {
    color: #333;
}

body[data-theme="dark"] #urlInput::placeholder {
    color: #888;
}

body[data-theme="dark"] .input-icon {
    color: #666;
}

/* Preview Section */
.preview-content {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.thumbnail-container {
    width: 160px;
    height: 90px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
    background: #eee;
    position: relative; /* 자식 요소의 position: absolute 기준점 */
}

#thumbnailImg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.thumbnail-fallback {
    display: none; /* 기본적으로 숨김 */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem; /* 아이콘 크기 조정 */
    color: white;
    width: 44px; /* 크기 조정 */
    height: 44px; /* 크기 조정 */
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    /* 내부 아이콘 중앙 정렬을 위한 flex 속성 */
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* fallback 활성화 시 이미지 숨김 */
.thumbnail-container.fallback-active #thumbnailImg {
    display: none;
}

.thumbnail-container.fallback-active .thumbnail-fallback {
    display: flex; /* fallback 활성화 시 보임 */
}

.info-container {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#mediaTitle {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.media-meta {
    display: flex;
    gap: 1rem;
    color: var(--light-text-color);
}

.media-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* Format Tabs */
.format-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

.format-tab {
    padding: 0.75rem 1.5rem;
    border: none;
    background: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--light-text-color);
    position: relative;
    transition: color 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.format-tab.active {
    color: var(--primary-color);
    font-weight: 600;
}

.format-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Options Container */
.format-group {
    display: none;
    animation: fadeIn 0.3s;
}

.format-group.active {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    align-items: center;
}

.option-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-weight: 500;
    color: var(--light-text-color);
}

select {
    width: 100%;
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-size: 1rem;
    background: #fff;
}

.size-estimate {
    grid-column: 1 / -1;
    text-align: right;
    color: var(--light-text-color);
    font-size: 0.9rem;
    font-weight: 500;
}

.download-btn {
    width: 100%;
    padding: 1rem;
    margin-top: 2rem;
    font-size: 1.1rem;
    background: #28a745;
    border: none;
    color: white;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.download-btn:hover {
    background: #218838;
    transform: translateY(-2px);
}

/* Progress Section */
.progress-container {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 0, 0, 0.1); /* 배경과 더 잘 어울리는 색으로 변경 */
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: auto;
    margin-right: auto;
}

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

.progress-details {
    text-align: center;
}

#progressStatus {
    font-weight: 500;
}

.progress-percentage {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 0.2s ease-in-out;
}


.feature-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    padding: 1rem 0; /* 상하 패딩 추가, 좌우는 없음 */
    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;
}

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

.feature-icon-wrapper {
    display: flex; /* 자식 요소를 중앙 정렬하기 위해 flex 사용 */
    justify-content: center;
    align-items: center;
    height: 56px; /* 아이콘을 담을 충분한 높이 확보 */
    margin-bottom: 1rem;
}

.feature-icon {
    width: 168px; /* 아이콘 1개 크기(56px) * 3 */
    height: 56px; /* 아이콘 크기 조정 */
    object-fit: none;
}

#icon-quality {
    width: 80px; /* 아이콘 자체 크기에 맞게 조정 */
    height: auto;
    object-fit: contain; /* 이미지 비율을 유지하며 컨테이너에 맞춤 */
}

#icon-formats {
    width: 80px; /* 아이콘 자체 크기에 맞게 조정 */
    height: auto;
    object-fit: contain; /* 이미지 비율을 유지하며 컨테이너에 맞춤 */
}

#icon-free {
    width: 80px; /* 아이콘 자체 크기에 맞게 조정 */
    height: auto;
    object-fit: contain; /* 이미지 비율을 유지하며 컨테이너에 맞춤 */
}



.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;
}

.format-badges {
    display: grid;
    grid-template-columns: repeat(4, auto); /* 내용에 맞는 4개의 열 */
    justify-content: center; /* 그리드 아이템들을 중앙으로 정렬 */
    gap: 0.3rem; /* 아이템 간의 간격을 조정합니다 */
    margin-top: 0.5rem;
}

.format-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
}

.format-badge.video {
    background-color: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.format-badge.audio {
    background-color: rgba(236, 72, 153, 0.1);
    color: #EC4899;
}

body[data-theme="dark"] .format-badge.video {
    background-color: rgba(96, 165, 250, 0.2);
    color: #93C5FD;
}

body[data-theme="dark"] .format-badge.audio {
    background-color: rgba(244, 114, 182, 0.2);
    color: #F9A8D4;
}
.platform-support-section {
    text-align: center;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0px;
    margin-top: 20px;
}

.platform-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 15px;
    background-color: var(--color-bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--color-border);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.platform-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.platform-item img {
    width: 32px;
    height: 32px;
    margin-bottom: 10px;
}

.platform-item span {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

.terms-notice {
    font-size: 0.75rem;
    color: var(--light-text-color);
    text-align: center;
    margin-top: 0.75rem;
}

.terms-notice a {
    color: var(--light-text-color);
    text-decoration: underline;
}

.terms-notice a:hover {
    color: var(--text-color);
}

.platform-section {
    width: 100%;
    max-width: 900px;
}


/* 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(auto-fit, minmax(280px, 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;
}

.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-color: #5374f4;
    color: #fff;
    font-weight: bold;
    font-size: 1rem;
    margin-right: 17px;
}

.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);
}

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


/* Footer */
footer {
    margin-top: 60px;
    text-align: center;
    color: var(--light-text-color);
    padding: 1rem 0;
}

.social-links {
    margin-bottom: 1rem;
}

.social-links a {
    display: inline-block;
    color: var(--light-text-color);
    margin: 0 0.5rem;
    transition: transform 0.3s;
}

.social-links a:hover {
    transform: scale(1.1);
}

.social-links img {
    width: 24px;
    height: 24px;
    vertical-align: middle;
}

body[data-theme="dark"] .social-links img {
    filter: invert(1);
}





/* Responsive */
@media (max-width: 768px) {
    .format-group.active {
        grid-template-columns: 1fr;
    }
    .preview-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .input-wrapper {
        flex-wrap: wrap;
        gap: 0.75rem;
        padding: 0.75rem;
    }
    .analyze-btn {
        flex-basis: 100%;
        justify-content: center;
    }
    #urlInput {
        min-width: 0;
        flex: 1;
    }
    .input-icon {
        margin: 0 0.5rem;
    }
    .guide-steps {
        flex-direction: column;
    }
}

/* 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"] .input-icon {
    margin: 0 1rem 0 1rem;
}

body[dir="rtl"] .analyze-btn,
body[dir="rtl"] .format-tab,
body[dir="rtl"] .download-btn,
body[dir="rtl"] .media-meta span,
body[dir="rtl"] .language-selector-btn {
    flex-direction: row-reverse;
}

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

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