:root {
    --bg-dark: #07090e;
    --bg-card: rgba(18, 24, 38, 0.75);
    --bg-card-hover: rgba(26, 35, 55, 0.85);
    --bg-input: rgba(12, 17, 29, 0.9);
    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-accent: rgba(255, 0, 51, 0.4);
    
    --primary: #ff0033;
    --primary-gradient: linear-gradient(135deg, #ff0033 0%, #ff4b4b 50%, #e11d48 100%);
    --primary-glow: rgba(255, 0, 51, 0.35);
    
    --success: #10b981;
    --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --success-glow: rgba(16, 185, 129, 0.35);
    
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-sans);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
    -webkit-font-smoothing: antialiased;
}

/* Background Ambient Glows */
.background-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(140px);
    pointer-events: none;
    z-index: 0;
    opacity: 0.15;
}

.background-glow.top-left {
    top: -200px;
    left: -150px;
    background: radial-gradient(circle, #ff0033, transparent 70%);
}

.background-glow.bottom-right {
    bottom: -200px;
    right: -150px;
    background: radial-gradient(circle, #6366f1, transparent 70%);
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* Header */
.app-header {
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(7, 9, 14, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 50;
    padding: 16px 0;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
}

.brand-logo-img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    object-fit: cover;
    box-shadow: 0 0 20px rgba(0, 168, 255, 0.35);
    border: 1px solid rgba(0, 168, 255, 0.4);
    transition: var(--transition);
}

.brand-logo:hover .brand-logo-img {
    transform: scale(1.06);
    box-shadow: 0 0 28px rgba(0, 168, 255, 0.6);
}

.logo-icon {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 0, 51, 0.12);
    border: 1px solid rgba(255, 0, 51, 0.3);
    border-radius: var(--radius-md);
    box-shadow: 0 0 20px rgba(255, 0, 51, 0.2);
}

.logo-icon svg {
    width: 26px;
    height: 26px;
}

.brand-text {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.brand-dotcloud {
    color: #00a8ff;
    font-weight: 800;
}

.brand-badge {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, rgba(255,0,51,0.2), rgba(255,0,51,0.05));
    border: 1px solid rgba(255, 0, 51, 0.35);
    color: #ff4b4b;
    padding: 3px 8px;
    border-radius: 20px;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.badge-count {
    background: #ff0033;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 12px;
    margin-left: 6px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: inherit;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-sm {
    padding: 8px 14px;
    font-size: 0.85rem;
}

.btn-md {
    padding: 10px 18px;
    font-size: 0.95rem;
}

.btn-lg {
    padding: 14px 26px;
    font-size: 1.05rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 26px rgba(255, 0, 51, 0.5);
}

.btn-success {
    background: var(--success-gradient);
    color: #ffffff;
    box-shadow: 0 4px 20px var(--success-glow);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 26px rgba(16, 185, 129, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid transparent;
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 48px 0 64px 0;
}

/* Hero Section */
.hero-section {
    text-align: center;
    max-width: 780px;
    margin: 0 auto 48px auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 0, 51, 0.08);
    border: 1px solid rgba(255, 0, 51, 0.25);
    color: #ff6666;
    padding: 6px 14px;
    border-radius: 30px;
    font-size: 0.82rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background: #ff0033;
    border-radius: 50%;
    box-shadow: 0 0 10px #ff0033;
    animation: pulse 1.8s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 0, 51, 0.7); }
    70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(255, 0, 51, 0); }
    100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 0, 51, 0); }
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
}

.gradient-text {
    background: linear-gradient(135deg, #ffffff 0%, #ff4b4b 60%, #ff0033 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 32px;
}

/* URL Card */
.url-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 16px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
    transition: var(--transition);
}

.url-card:focus-within {
    border-color: var(--border-accent);
    box-shadow: 0 16px 40px rgba(255, 0, 51, 0.15);
}

.url-form {
    display: flex;
    gap: 12px;
}

.input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 18px;
    color: var(--text-muted);
    pointer-events: none;
    display: flex;
}

.url-input {
    width: 100%;
    background: var(--bg-input);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.98rem;
    padding: 14px 90px 14px 48px;
    outline: none;
    transition: var(--transition);
}

.url-input:focus {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(16, 22, 38, 0.95);
}

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

.paste-btn {
    position: absolute;
    right: 10px;
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.paste-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.fetch-btn {
    min-width: 140px;
    border-radius: var(--radius-md);
}

/* Quick Samples */
.quick-samples {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 14px;
    flex-wrap: wrap;
    font-size: 0.85rem;
}

.samples-label {
    color: var(--text-muted);
}

.sample-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: var(--transition);
}

.sample-chip:hover {
    background: rgba(255, 0, 51, 0.12);
    border-color: rgba(255, 0, 51, 0.3);
    color: #ff6666;
}

/* Alerts */
.alert {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    margin-top: 20px;
    text-align: left;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.alert-icon {
    font-size: 1.3rem;
}

.alert-content strong {
    display: block;
    font-size: 0.92rem;
    color: #ffffff;
}

.alert-content p {
    font-size: 0.85rem;
    color: #fca5a5;
    margin: 0;
}

.alert-close {
    margin-left: auto;
    background: transparent;
    border: none;
    color: #fca5a5;
    font-size: 1.1rem;
    cursor: pointer;
}

/* Cards */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}

/* Video Preview Section */
.video-preview-section {
    margin-bottom: 36px;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(14px); }
    to { opacity: 1; transform: translateY(0); }
}

.preview-card {
    padding: 24px;
}

.preview-grid {
    display: grid;
    grid-template-columns: 340px 1fr;
    gap: 28px;
}

.thumbnail-wrapper {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #000;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
    aspect-ratio: 16/9;
}

.thumbnail-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.thumbnail-wrapper:hover .thumbnail-img {
    transform: scale(1.03);
}

.duration-badge {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(4px);
    color: #fff;
    font-family: var(--font-mono);
    font-size: 0.78rem;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 6px;
}

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

.video-title {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.meta-row {
    display: flex;
    align-items: center;
    gap: 18px;
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-bottom: 22px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.selection-title {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.sample-4k {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.15));
    border-color: rgba(245, 158, 11, 0.4);
    color: #fbbf24;
    font-weight: 700;
}

.sample-4k:hover {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.25), rgba(239, 68, 68, 0.25));
    border-color: #f59e0b;
    box-shadow: 0 0 14px rgba(245, 158, 11, 0.3);
    color: #fef08a;
}

/* Qualities Grid */
.qualities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 12px;
    margin-bottom: 24px;
}

.quality-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    user-select: none;
}

.quality-card:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.quality-card.selected {
    background: rgba(255, 0, 51, 0.12);
    border-color: var(--primary);
    box-shadow: 0 0 16px rgba(255, 0, 51, 0.25);
}

/* Special 4K Ultra HD Card */
.quality-card.card-4k {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.07), rgba(239, 68, 68, 0.07));
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.quality-card.card-4k:hover {
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
}

.quality-card.card-4k.selected {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.18), rgba(239, 68, 68, 0.18));
    border-color: #f59e0b;
    box-shadow: 0 0 24px rgba(245, 158, 11, 0.4);
}

.quality-card.card-4k .quality-label {
    color: #fef08a;
}

.badge-4k {
    background: linear-gradient(135deg, #f59e0b, #ef4444) !important;
    color: #ffffff !important;
    font-weight: 800 !important;
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
}

.quality-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

.quality-label {
    font-weight: 700;
    font-size: 0.95rem;
    color: #fff;
}

.quality-badge {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 2px 6px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

.quality-card.selected .quality-badge {
    background: #ff0033;
    color: #ffffff;
}

.quality-desc {
    font-size: 0.78rem;
    color: var(--text-muted);
}

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

/* Progress Section */
.progress-section {
    margin-bottom: 36px;
    animation: fadeIn 0.3s ease-out;
}

.progress-card {
    padding: 24px;
    border-color: rgba(255, 0, 51, 0.3);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.progress-title-wrap {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-title {
    font-size: 1.15rem;
    font-weight: 700;
}

.progress-stats {
    display: flex;
    gap: 10px;
}

.stat-pill {
    background: rgba(255, 255, 255, 0.07);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    padding: 4px 10px;
    border-radius: 6px;
    color: var(--text-secondary);
}

.progress-track {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ff0033 0%, #ff6b6b 70%, #10b981 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
    box-shadow: 0 0 12px rgba(255, 0, 51, 0.5);
}

.progress-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.progress-percent {
    font-family: var(--font-mono);
    font-weight: 700;
    color: #fff;
}

/* Completed Box */
.completed-box {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    animation: fadeIn 0.4s ease-out;
}

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

.check-icon {
    width: 40px;
    height: 40px;
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.4);
    color: #10b981;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 700;
}

.completed-message h4 {
    font-size: 1.1rem;
    color: #fff;
}

.completed-message p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.completed-buttons {
    display: flex;
    gap: 12px;
}

/* Features Highlights */
.features-section {
    margin: 48px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
    background: var(--bg-card-hover);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.red-glow { background: rgba(255, 0, 51, 0.12); color: #ff3355; }
.blue-glow { background: rgba(59, 130, 246, 0.12); color: #60a5fa; }
.green-glow { background: rgba(16, 185, 129, 0.12); color: #34d399; }

.feature-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.feature-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    line-height: 1.5;
}

/* History Section */
.history-section {
    margin-top: 48px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-title {
    font-size: 1.3rem;
    font-weight: 700;
}

.history-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.empty-history {
    padding: 36px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

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

.history-item:hover {
    background: rgba(255, 255, 255, 0.02);
}

.history-file-info {
    display: flex;
    align-items: center;
    gap: 14px;
    overflow: hidden;
}

.ext-badge {
    background: rgba(255, 0, 51, 0.15);
    border: 1px solid rgba(255, 0, 51, 0.3);
    color: #ff4b4b;
    font-size: 0.75rem;
    font-weight: 800;
    padding: 4px 8px;
    border-radius: 6px;
    font-family: var(--font-mono);
}

.history-text {
    overflow: hidden;
}

.history-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 480px;
}

.history-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    gap: 12px;
}

.history-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Spinner */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 0.8s linear infinite;
}

.spinner-small {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 0, 51, 0.3);
    border-radius: 50%;
    border-top-color: #ff0033;
    animation: spin 0.8s linear infinite;
}

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

/* Toast */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: rgba(18, 24, 38, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    color: #fff;
    padding: 12px 18px;
    border-radius: var(--radius-md);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease-out;
}

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

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

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

/* SEO Content Sections */
.seo-section {
    margin: 64px 0;
}

.section-title-wrap {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 36px auto;
}

.section-heading {
    font-size: 1.85rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
    color: #ffffff;
}

.section-subheading {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* HowTo Steps Grid */
.howto-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.howto-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    position: relative;
    transition: var(--transition);
}

.howto-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 0, 51, 0.3);
    background: var(--bg-card-hover);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4);
}

.step-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 2px 8px;
    border-radius: 6px;
}

.howto-icon {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.howto-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: #ffffff;
}

.howto-text {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.55;
}

/* Formats Comparison Table */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.formats-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    min-width: 620px;
}

.formats-table th {
    background: rgba(255, 255, 255, 0.04);
    padding: 16px 20px;
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
}

.formats-table td {
    padding: 16px 20px;
    font-size: 0.9rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-subtle);
}

.formats-table tr:last-child td {
    border-bottom: none;
}

.formats-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.table-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.78rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-subtle);
}

.table-badge.badge-audio {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.4);
    color: #60a5fa;
}

/* FAQ Accordion */
.faq-accordion {
    max-width: 780px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item[open] {
    border-color: rgba(255, 0, 51, 0.3);
    background: var(--bg-card-hover);
}

.faq-question {
    padding: 18px 22px;
    font-size: 1rem;
    font-weight: 600;
    color: #ffffff;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-toggle {
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}

.faq-item[open] .faq-toggle {
    transform: rotate(180deg);
    color: #ff0033;
}

.faq-answer {
    padding: 0 22px 18px 22px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Footer Links & Disclaimer */
.app-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 32px 0 24px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer-links a:hover {
    color: #ff0033;
}

.footer-disclaimer {
    font-size: 0.75rem;
    color: #475569;
    margin-top: 8px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Responsive Breakpoints */
@media (max-width: 860px) {
    .container {
        padding: 0 18px;
    }
    .preview-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .features-grid {
        grid-template-columns: 1fr;
    }
    .howto-grid {
        grid-template-columns: 1fr;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .url-form {
        flex-direction: column;
    }
    .fetch-btn {
        width: 100%;
        padding: 14px;
        font-size: 1rem;
    }
    .completed-box {
        flex-direction: column;
        align-items: flex-start;
    }
    .completed-buttons {
        width: 100%;
        flex-direction: column;
    }
    .completed-buttons a,
    .completed-buttons button {
        width: 100%;
        justify-content: center;
    }
}

/* Mobile Devices (max-width: 640px) */
@media (max-width: 640px) {
    .container {
        padding: 0 14px;
    }
    .app-header {
        padding: 12px 0;
    }
    .header-container {
        flex-direction: column;
        gap: 12px;
        align-items: stretch;
    }
    .brand-logo {
        justify-content: center;
    }
    .header-actions {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 8px;
        width: 100%;
    }
    .header-actions .btn {
        font-size: 0.78rem;
        padding: 8px 10px;
        justify-content: center;
    }
    .header-actions .btn span:not(.badge-count) {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .main-content {
        padding: 24px 0 48px 0;
    }
    .hero-section {
        margin-bottom: 32px;
    }
    .hero-badge {
        font-size: 0.75rem;
        padding: 5px 12px;
    }
    .hero-title {
        font-size: 1.8rem;
        line-height: 1.2;
    }
    .hero-subtitle {
        font-size: 0.92rem;
        margin-bottom: 22px;
    }

    .url-card {
        padding: 12px;
        border-radius: var(--radius-lg);
    }
    .url-input {
        font-size: 0.9rem;
        padding: 12px 80px 12px 42px;
    }
    .input-icon {
        left: 14px;
    }
    .paste-btn {
        right: 8px;
        padding: 5px 10px;
        font-size: 0.75rem;
    }

    .quick-samples {
        gap: 6px;
        margin-top: 12px;
    }
    .sample-chip {
        font-size: 0.75rem;
        padding: 6px 12px;
    }

    /* Preview Card */
    .preview-card {
        padding: 16px;
        border-radius: var(--radius-md);
    }
    .video-title {
        font-size: 1.15rem;
        line-height: 1.3;
    }
    .meta-row {
        gap: 12px;
        font-size: 0.8rem;
        margin-bottom: 16px;
        flex-wrap: wrap;
    }

    /* Qualities Grid: 2 columns on mobile */
    .qualities-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        margin-bottom: 18px;
    }
    .quality-card {
        padding: 10px 12px;
    }
    .quality-label {
        font-size: 0.88rem;
    }
    .quality-badge {
        font-size: 0.6rem;
        padding: 2px 5px;
    }
    .quality-desc {
        font-size: 0.72rem;
    }

    .start-download-btn {
        padding: 12px 18px;
        font-size: 0.95rem;
    }

    /* Progress Section */
    .progress-card {
        padding: 16px;
    }
    .progress-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .progress-stats {
        width: 100%;
        justify-content: space-between;
    }
    .stat-pill {
        font-size: 0.75rem;
        padding: 3px 8px;
    }
    .progress-title {
        font-size: 1rem;
    }

    /* History */
    .history-item {
        padding: 12px 14px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .history-file-info {
        width: 100%;
    }
    .history-name {
        max-width: 230px;
        font-size: 0.88rem;
    }
    .history-actions {
        width: 100%;
        justify-content: flex-end;
    }
    .history-actions .btn {
        flex: 1;
        justify-content: center;
    }
}

/* Small Screens (max-width: 380px) */
@media (max-width: 380px) {
    .qualities-grid {
        grid-template-columns: 1fr;
    }
    .hero-title {
        font-size: 1.55rem;
    }
    .header-actions {
        grid-template-columns: 1fr;
    }
}