:root {
    /* Brand palette */
    --brand-cream: #e4dbca;
    --brand-navy: #0c104c;
    --brand-white: #fdfffc;

    --primary: var(--brand-navy);
    --primary-hover: #080b37;
    --accent: var(--brand-cream);
    --bg-light: var(--brand-white);
    --bg-card: #ffffff;
    --text-main: #0c104c;
    --text-muted: rgba(12, 16, 76, 0.68);
    --border: rgba(12, 16, 76, 0.12);
    --success: #22c55e;
    --error: #ef4444;
    --radius-lg: 16px;
    --radius-md: 12px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-light);
    color: var(--text-main);
    line-height: 1.5;
    transition: background-color var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

body::before {
    content: "";
    position: fixed;
    inset: -200px;
    pointer-events: none;
    background:
        radial-gradient(600px 300px at 20% 10%, rgba(228, 219, 202, 0.45), transparent 60%),
        radial-gradient(650px 320px at 80% 20%, rgba(12, 16, 76, 0.10), transparent 60%),
        radial-gradient(700px 350px at 50% 85%, rgba(228, 219, 202, 0.25), transparent 65%);
    filter: blur(2px);
    z-index: -1;
}

/* Smooth page entrance */
.navbar, .hero-section, .result-container, .downloads-container, .footer {
    animation: fadeUp 700ms cubic-bezier(0.2, 0.9, 0.2, 1) both;
}
.hero-section { animation-delay: 40ms; }
.result-container { animation-delay: 60ms; }
.downloads-container { animation-delay: 80ms; }
.footer { animation-delay: 100ms; }

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

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* Navbar */
.navbar {
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
    background: color-mix(in srgb, var(--bg-card) 86%, transparent);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo-img {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 8px 18px rgba(12, 16, 76, 0.18);
    border: 1px solid var(--border);
}

.logo h1 {
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

/* Hero Section */
.hero-section {
    padding: 80px 0 40px;
    text-align: center;
}

.hero-section h2 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.highlight {
    color: var(--primary);
    position: relative;
}

.highlight::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 6px;
    height: 10px;
    background: rgba(228, 219, 202, 0.75);
    z-index: -1;
    border-radius: 999px;
    transform: skewX(-12deg);
}

.hero-section p {
    font-size: 18px;
    color: var(--text-muted);
    margin-bottom: 40px;
}

/* Input Area */
.input-wrapper {
    position: relative;
    max-width: 700px;
    margin: 0 auto;
}

#video-url {
    width: 100%;
    padding: 20px 180px 20px 24px;
    font-size: 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    outline: none;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

#video-url:hover {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(12, 16, 76, 0.10);
}

#video-url:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(228, 219, 202, 0.55), var(--shadow-md);
}

.primary-btn {
    position: absolute;
    right: 8px;
    top: 8px;
    bottom: 8px;
    background: linear-gradient(135deg, var(--primary) 0%, color-mix(in srgb, var(--primary) 75%, #000) 100%);
    color: white;
    border: none;
    padding: 0 24px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 10px 22px rgba(12, 16, 76, 0.22);
    letter-spacing: 0.01em;
    overflow: hidden;
}

.primary-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(500px 80px at 20% 30%, rgba(228, 219, 202, 0.35), transparent 60%);
    opacity: 0;
    transition: opacity 220ms ease;
}

.primary-btn::after {
    content: "";
    position: absolute;
    top: -40%;
    left: -60%;
    width: 60%;
    height: 180%;
    transform: rotate(18deg);
    background: linear-gradient(90deg, transparent, rgba(253, 255, 252, 0.35), transparent);
    opacity: 0;
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 14px 28px rgba(12, 16, 76, 0.28);
}

.primary-btn:hover::before {
    opacity: 1;
}

.primary-btn:hover::after {
    opacity: 1;
    animation: shine 900ms ease both;
}

.primary-btn:active {
    transform: translateY(0);
    box-shadow: 0 8px 18px rgba(12, 16, 76, 0.20);
}

.primary-btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(228, 219, 202, 0.65), 0 14px 28px rgba(12, 16, 76, 0.24);
}

.primary-btn:disabled {
    cursor: not-allowed;
    opacity: 0.7;
    transform: none;
    box-shadow: none;
}

@keyframes shine {
    0% { transform: translateX(0) rotate(18deg); }
    100% { transform: translateX(260%) rotate(18deg); }
}

@keyframes btnBreathe {
    0% { transform: translateY(0); box-shadow: 0 10px 22px rgba(12, 16, 76, 0.22); }
    100% { transform: translateY(-1px); box-shadow: 0 14px 28px rgba(12, 16, 76, 0.28); }
}

.paste-hint {
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-muted);
}

kbd {
    background: color-mix(in srgb, var(--accent) 55%, var(--bg-card));
    padding: 2px 6px;
    border-radius: 4px;
    font-family: inherit;
    font-size: 12px;
    border: 1px solid var(--border);
}

/* Result Section */
.result-container {
    margin: 40px auto;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.5s ease;
}

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

.video-preview-card {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border);
}

.thumbnail-wrapper {
    position: relative;
    width: 280px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
}

.thumbnail-wrapper img {
    width: 100%;
    display: block;
}

.duration-badge {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.8);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 12px;
}

.video-info h3 {
    font-size: 22px;
    margin-bottom: 8px;
    font-weight: 700;
}

.video-info p {
    color: var(--text-muted);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    background: var(--bg-light);
    padding: 6px;
    border-radius: var(--radius-md);
    width: fit-content;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: var(--transition);
}

.tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.tab-btn:hover {
    color: var(--primary);
    background: color-mix(in srgb, var(--accent) 22%, transparent);
}

.tab-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

@media (max-width: 900px) {
    .tab-content {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    }
}

/* Format Cards */
.format-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.format-card:hover {
    border-color: var(--primary);
    background: color-mix(in srgb, var(--accent) 18%, transparent);
}

.format-meta .quality {
    display: block;
    font-weight: 700;
    font-size: 16px;
}

.format-meta .ext-size {
    font-size: 13px;
    color: var(--text-muted);
}

.download-link {
    background: color-mix(in srgb, var(--accent) 35%, var(--bg-light));
    color: var(--primary);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    border: 1px solid var(--border);
}

.download-link:hover {
    background: var(--primary);
    color: white;
}

/* Loading & Errors */
.loading-container {
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: rotate 1s linear infinite;
}

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

.error-container {
    margin-top: 24px;
    padding: 16px;
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
    border-radius: var(--radius-md);
    font-weight: 500;
}

.hidden { display: none; }

/* Downloads List */
.downloads-container {
    margin-top: 40px;
    padding: 40px 0;
}

.downloads-container h3 {
    margin-bottom: 24px;
}

.download-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

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

/* For PHP version, we show a generic indeterminate progress during downloading 
   if we don't have socket.io, or we can just leave it static showing 'Downloading...' */
.progress-container {
    height: 8px;
    background: var(--bg-light);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 220ms ease;
}

.progress-stats {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
    gap: 10px;
}

.progress-stats span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* (Dark mode removed) */

/* Footer */
.footer {
    margin-top: auto;
    padding: 40px 0;
    border-top: 1px solid var(--border);
    text-align: center;
}

.footer-links {
    margin-top: 12px;
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
}

/* Responsive */
/* Laptop & below */
@media (max-width: 1024px) {
    .container { padding: 0 18px; }
    .hero-section { padding: 64px 0 32px; }
    .hero-section h2 { font-size: 40px; }
    .thumbnail-wrapper { width: 240px; }
}

/* Tablet */
@media (max-width: 768px) {
    .navbar { padding: 16px 0; }
    .logo h1 { font-size: 18px; }
    .hero-section { padding: 52px 0 28px; }
    .hero-section h2 { font-size: 32px; }
    .hero-section p { font-size: 16px; }

    .video-preview-card { flex-direction: column; }
    .thumbnail-wrapper { width: 100%; }

    .tabs { width: 100%; }
    .tab-content { grid-template-columns: 1fr; }

    #video-url { padding-right: 24px; padding-bottom: 80px; }
    .primary-btn { left: 8px; right: 8px; top: auto; bottom: 8px; width: auto; }

    .result-container { padding: 22px; }
}

/* Mobile */
@media (max-width: 480px) {
    .container { padding: 0 14px; }
    .hero-section { padding: 44px 0 24px; }
    .hero-section h2 { font-size: 28px; }

    #video-url { padding: 18px 18px 92px; font-size: 15px; }
    .primary-btn { height: 84px; font-size: 18px; padding: 0 22px; border-radius: 14px; }
    .primary-btn::after { opacity: 1; animation: shine 1400ms ease infinite; }
    .primary-btn { animation: btnBreathe 1.6s ease-in-out infinite alternate; }

    .format-card { padding: 16px; gap: 12px; }
    .format-meta .quality { font-size: 15px; }

    .download-item-header { flex-direction: column; align-items: flex-start; gap: 6px; }
    .progress-stats { flex-wrap: wrap; justify-content: flex-start; }
    .progress-stats span { max-width: 48%; }

    .footer-links { flex-direction: column; gap: 10px; }
}

@media (prefers-reduced-motion: reduce) {
    .navbar, .hero-section, .result-container, .downloads-container, .footer {
        animation: none !important;
    }
    .primary-btn, .primary-btn::after {
        animation: none !important;
    }
}