/* ============================================
   抖音视频下载 — 暗色主题样式
   ============================================ */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a26;
    --bg-card-hover: #22223a;
    --bg-input: #16161f;
    --border-color: rgba(255, 255, 255, 0.06);
    --border-focus: rgba(254, 44, 85, 0.5);

    --text-primary: #f0f0f5;
    --text-secondary: #9a9ab0;
    --text-muted: #5a5a72;

    --accent: #FE2C55;
    --accent-hover: #ff4470;
    --accent-glow: rgba(254, 44, 85, 0.25);
    --cyan: #25F4EE;
    --cyan-glow: rgba(37, 244, 238, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 40px var(--accent-glow);

    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 600px;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-glow) 0%, transparent 70%),
        radial-gradient(ellipse 60% 40% at 80% 0%, var(--cyan-glow) 0%, transparent 60%);
    pointer-events: none;
    z-index: 0;
}

.app {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   Header
   ============================================ */
.header {
    padding: 48px 0 24px;
    text-align: center;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    filter: drop-shadow(0 0 12px var(--accent-glow));
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    color: var(--text-muted);
    font-size: 0.875rem;
    letter-spacing: 0.15em;
    font-weight: 500;
}

/* ============================================
   Main
   ============================================ */
.main {
    flex: 1;
    padding-bottom: 48px;
}

/* Input Section */
.input-section {
    margin-bottom: 32px;
}

.input-wrapper {
    display: flex;
    gap: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-glow);
}

.url-input {
    flex: 1;
    padding: 16px 20px;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font);
}

.url-input::placeholder {
    color: var(--text-muted);
}

.parse-btn {
    padding: 16px 32px;
    background: var(--accent);
    color: white;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: background var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.parse-btn:hover {
    background: var(--accent-hover);
}

.parse-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-loader {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.input-hint {
    margin-top: 10px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* Error */
.error-msg {
    padding: 14px 20px;
    background: rgba(254, 44, 85, 0.08);
    border: 1px solid rgba(254, 44, 85, 0.2);
    border-radius: var(--radius-md);
    color: var(--accent);
    font-size: 0.9rem;
    margin-bottom: 24px;
    text-align: center;
}

/* ============================================
   Result Section
   ============================================ */
.result-section {
    animation: fadeUp 0.4s ease-out;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

/* Preview Card */
.preview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 9 / 16;
    max-height: 560px;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container video {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Info Card */
.info-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.author-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
}

.author-info {
    display: flex;
    flex-direction: column;
}

.author-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.video-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.video-title {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Stats */
.stats-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.stat-item svg {
    width: 16px;
    height: 16px;
    opacity: 0.6;
}

/* Quality Selector */
.section-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.quality-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.quality-item {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    gap: 10px;
}

.quality-item:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.1);
}

.quality-item.active {
    border-color: var(--accent);
    background: rgba(254, 44, 85, 0.06);
}

.quality-item input[type="radio"] {
    display: none;
}

.quality-radio {
    width: 16px;
    height: 16px;
    border: 2px solid var(--text-muted);
    border-radius: 50%;
    flex-shrink: 0;
    position: relative;
    transition: border-color var(--transition);
}

.quality-item.active .quality-radio {
    border-color: var(--accent);
}

.quality-item.active .quality-radio::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

.quality-label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.quality-meta {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 8px;
}

.quality-codec {
    font-size: 0.7rem;
    color: var(--cyan);
    background: rgba(37, 244, 238, 0.08);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 600;
}

.quality-size {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Download Button */
.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--accent) 0%, #d61e48 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--transition);
    margin-top: auto;
}

.download-btn svg {
    width: 20px;
    height: 20px;
}

.download-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px var(--accent-glow);
}

.download-btn:active {
    transform: translateY(0);
}

/* ============================================
   Image Gallery
   ============================================ */
.image-header {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.gallery-item {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition);
}

.gallery-item:hover {
    border-color: rgba(255, 255, 255, 0.12);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

.gallery-item img {
    width: 100%;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    display: block;
}

.gallery-item .img-index {
    position: absolute;
    top: 8px;
    left: 8px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
}

.gallery-item .img-download-btn {
    position: absolute;
    bottom: 8px;
    right: 8px;
    width: 32px;
    height: 32px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.8);
    transition: all var(--transition);
}

.gallery-item:hover .img-download-btn {
    opacity: 1;
    transform: scale(1);
}

.gallery-item .img-download-btn svg {
    width: 16px;
    height: 16px;
}

.download-all-btn {
    width: 100%;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    padding: 24px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    .header {
        padding: 32px 0 20px;
    }

    .logo h1 {
        font-size: 1.35rem;
    }

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

    .video-container {
        max-height: 400px;
    }

    .parse-btn {
        padding: 16px 20px;
    }

    .quality-meta {
        gap: 4px;
    }

    .image-gallery {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    }
}

@media (max-width: 480px) {
    .app {
        padding: 0 12px;
    }

    .input-wrapper {
        flex-direction: column;
        border-radius: var(--radius-md);
    }

    .parse-btn {
        border-radius: 0;
        justify-content: center;
    }

    .stats-row {
        gap: 10px;
    }
}