/* ===== RESET & BASE ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161f;
    --bg-card-hover: #1e1e2a;
    --border: rgba(255,255,255,0.08);
    --border-active: rgba(255,255,255,0.15);
    --text-primary: #f0f0f8;
    --text-secondary: #8888a8;
    --text-muted: #55556a;
    --accent: #FF0000;
    --accent-hover: #cc0000;
    --accent-glow: rgba(255, 0, 0, 0.3);
    --success: #00c851;
    --success-bg: rgba(0, 200, 81, 0.1);
    --warning: #ffbb33;
    --blue: #4c8dff;
    --purple: #9b59b6;
    --gradient-main: linear-gradient(135deg, #FF0000 0%, #ff6b35 50%, #ff9a3c 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
    --shadow-card: 0 20px 60px rgba(0,0,0,0.4);
    --shadow-glow: 0 0 40px rgba(255,0,0,0.15);
    --radius: 20px;
    --radius-sm: 12px;
    --radius-xs: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    background-image: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(255,0,0,0.08), transparent),
        radial-gradient(ellipse 60% 40% at 80% 80%, rgba(76,141,255,0.05), transparent);
}

/* ===== NAVBAR ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    background: rgba(10,10,15,0.8);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}

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

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-badge {
    background: linear-gradient(135deg, rgba(255,0,0,0.2), rgba(255,107,53,0.2));
    border: 1px solid rgba(255,0,0,0.3);
    color: #ff6b35;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ===== CONTAINER ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== HERO ===== */
.hero-section {
    padding: 60px 0 100px;
}

.hero-content {
    margin-bottom: 48px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 20px;
}

.logo-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-main);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-glow);
    animation: pulse-glow 3s ease-in-out infinite;
}

.logo-icon svg {
    width: 36px;
    height: 36px;
    color: white;
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(255,0,0,0.3), 0 0 40px rgba(255,0,0,0.1); }
    50% { box-shadow: 0 0 30px rgba(255,0,0,0.5), 0 0 60px rgba(255,0,0,0.2); }
}

.brand-title {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    font-weight: 400;
}

/* ===== SEARCH CARD ===== */
.search-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-card);
    margin-bottom: 32px;
    position: relative;
    overflow: hidden;
}

.search-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-main);
    border-radius: var(--radius) var(--radius) 0 0;
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 8px 8px 16px;
    transition: var(--transition);
}

.search-input-wrapper:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.yt-icon {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.yt-icon svg {
    width: 24px;
    height: 24px;
}

.url-input {
    flex: 1;
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    padding: 8px 0;
    min-width: 0;
}

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

.fetch-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--gradient-main);
    color: white;
    border: none;
    border-radius: var(--radius-xs);
    padding: 12px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    font-family: inherit;
}

.fetch-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px var(--accent-glow);
}

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

.btn-arrow {
    width: 18px;
    height: 18px;
}

.search-hint {
    margin-top: 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
    text-align: center;
}

/* ===== LOADING ===== */
.loading-section {
    text-align: center;
    padding: 60px 0;
}

.loading-spinner {
    display: inline-flex;
    gap: 12px;
    margin-bottom: 20px;
}

.spinner-ring {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--accent);
    animation: bounce 1.2s ease-in-out infinite;
}

.spinner-ring:nth-child(1) { animation-delay: 0s; }
.spinner-ring:nth-child(2) { animation-delay: 0.2s; }
.spinner-ring:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
    40% { transform: scale(1); opacity: 1; }
}

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

/* ===== ERROR ===== */
.error-card {
    background: rgba(255, 0, 0, 0.05);
    border: 1px solid rgba(255, 0, 0, 0.2);
    border-radius: var(--radius);
    padding: 40px;
    text-align: center;
}

.error-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.error-message {
    color: #ff6666;
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.retry-btn {
    background: rgba(255,0,0,0.15);
    border: 1px solid rgba(255,0,0,0.3);
    color: #ff6666;
    padding: 10px 24px;
    border-radius: var(--radius-xs);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.9rem;
    transition: var(--transition);
}

.retry-btn:hover {
    background: rgba(255,0,0,0.25);
}

/* ===== VIDEO CARD ===== */
.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.video-card-inner {
    display: flex;
    gap: 24px;
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

/* ===== THUMBNAIL ===== */
.thumbnail-container {
    position: relative;
    flex-shrink: 0;
    width: 200px;
    height: 112px;
    border-radius: var(--radius-xs);
    overflow: hidden;
    cursor: pointer;
}

.thumbnail {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.thumbnail-container:hover .thumbnail {
    transform: scale(1.05);
}

.thumbnail-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.thumbnail-container:hover .thumbnail-overlay {
    opacity: 1;
}

.play-badge {
    width: 50px;
    height: 50px;
    background: rgba(255,0,0,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.duration-badge {
    position: absolute;
    bottom: 6px;
    right: 6px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

/* ===== VIDEO META ===== */
.video-meta {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 12px;
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--text-primary);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.stat {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.stat svg {
    opacity: 0.7;
}

/* ===== FORMAT SECTION ===== */
.format-section {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}

.format-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.format-option {
    position: relative;
    cursor: pointer;
}

.format-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.format-label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px;
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.format-label:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(255,255,255,0.15);
}

.format-option input:checked + .format-label {
    background: rgba(255, 0, 0, 0.1);
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent), inset 0 0 20px rgba(255,0,0,0.05);
}

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

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

.format-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.recommended-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background: var(--gradient-main);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 999px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* ===== DOWNLOAD SECTION ===== */
.download-section {
    padding: 24px;
    text-align: center;
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: var(--gradient-main);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    padding: 16px 48px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    letter-spacing: 0.02em;
    min-width: 250px;
    justify-content: center;
}

.download-btn:disabled {
    background: rgba(255,255,255,0.1);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.download-btn:not(:disabled):hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px var(--accent-glow);
}

.download-btn:not(:disabled):active {
    transform: translateY(0);
}

.download-hint {
    margin-top: 10px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

/* ===== PROGRESS ===== */
.download-progress {
    padding: 0 24px 24px;
    text-align: center;
}

.progress-bar-container {
    height: 4px;
    background: rgba(255,255,255,0.08);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--gradient-main);
    border-radius: 2px;
    animation: progress-indeterminate 1.5s ease-in-out infinite;
}

@keyframes progress-indeterminate {
    0% { transform: translateX(-100%); width: 60%; }
    100% { transform: translateX(200%); width: 60%; }
}

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

/* ===== NEW SEARCH BTN ===== */
.new-search-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 24px auto 0;
    background: none;
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 10px 20px;
    border-radius: var(--radius-xs);
    cursor: pointer;
    font-family: inherit;
    font-size: 0.875rem;
    transition: var(--transition);
}

.new-search-btn:hover {
    border-color: var(--border-active);
    color: var(--text-primary);
    background: rgba(255,255,255,0.04);
}

/* ===== FEATURES ===== */
.features-section {
    margin-top: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 24px 20px;
    text-align: center;
    transition: var(--transition);
}

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

.feature-icon {
    font-size: 2rem;
    margin-bottom: 12px;
}

.feature-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.feature-card p {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===== FOOTER ===== */
.footer {
    border-top: 1px solid var(--border);
    padding: 24px 0;
    margin-top: 80px;
    text-align: center;
}

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

/* ===== UTILITIES ===== */
.hidden {
    display: none !important;
}

.lang-dropdown { position: relative; }

.lang-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,.18);
    background: rgba(255,255,255,.06);
    color: inherit;
    cursor: pointer;
    transition: transform .08s ease, background .2s ease, border-color .2s ease;
}

.lang-btn:hover { background: rgba(255,255,255,.10); border-color: rgba(255,255,255,.30); }
.lang-btn:active { transform: translateY(1px); }

.lang-btn-text { font-size: .9rem; font-weight: 600; opacity: .95; }
.lang-caret { opacity: .9; }

.lang-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    min-width: 180px;
    padding: 8px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,.14);
    background: rgba(20,20,20,.75);
    backdrop-filter: blur(10px);
    box-shadow: 0 16px 50px rgba(0,0,0,.35);
    display: none;
    z-index: 50;
}

.lang-menu.open { display: block; }

.lang-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 10px;
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    font-size: .9rem;
    opacity: .92;
    transition: background .15s ease, opacity .15s ease;
}

.lang-item:hover { background: rgba(255,255,255,.10); opacity: 1; }

.lang-dot {
    width: 8px;
    height: 8px;
    border-radius: 999px;
    background: rgba(255,255,255,.30);
}

.lang-item.active .lang-dot { background: var(--accent); }
.lang-item.active { background: rgba(255,255,255,.08); opacity: 1; }


/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .brand-title { font-size: 2rem; }
    .hero-section { padding: 40px 0 60px; }
    
    .video-card-inner {
        flex-direction: column;
    }
    
    .thumbnail-container {
        width: 100%;
        height: 200px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .search-input-wrapper {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    
    .fetch-btn {
        justify-content: center;
    }
    
    .format-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .format-grid {
        grid-template-columns: 1fr;
    }
    
    .logo-wrapper {
        flex-direction: column;
        gap: 12px;
    }
}