/* ── Reset & Base ───────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg: #f8f9fc;
    --surface: #ffffff;
    --surface-hover: #f3f4f8;
    --border: #e4e7ec;
    --text: #1a1d26;
    --text-muted: #6b7280;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-soft: rgba(99, 102, 241, 0.08);
    --red: #ef4444;
    --red-soft: rgba(239, 68, 68, 0.06);
    --green: #10b981;
    --green-soft: rgba(16, 185, 129, 0.08);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow: 0 4px 24px rgba(0,0,0,0.06);
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

body {
    position: relative;
    background: #ffffff;
    color: var(--text);
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased;
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
    isolation: isolate;
}

body::before {
    content: "";
    position: fixed;
    top: -172px;
    left: 50%;
    transform: translateX(-50%);
    width: min(860px, 114vw);
    height: 295px;
    border-radius: 0 0 999px 999px;
    background:
        radial-gradient(circle at 34% 30%, rgba(250, 204, 21, 0.18) 0%, rgba(250, 204, 21, 0.08) 24%, rgba(250, 204, 21, 0) 56%),
        radial-gradient(circle at 66% 28%, rgba(248, 113, 113, 0.14) 0%, rgba(248, 113, 113, 0.06) 24%, rgba(248, 113, 113, 0) 54%),
        radial-gradient(ellipse at center, rgba(255, 214, 102, 0.14) 0%, rgba(251, 146, 60, 0.06) 42%, rgba(248, 113, 113, 0.02) 64%, rgba(255, 255, 255, 0) 82%);
    pointer-events: none;
    z-index: 0;
}

/* ── Container ──────────────────────────────── */
.container {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Header ─────────────────────────────────── */
.header {
    padding: 26px 0 20px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--accent);
    font-weight: 700;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
}

/* ── Hero ───────────────────────────────────── */
.hero {
    padding: 40px 0 32px;
}

h1 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--text);
}

.subtitle {
    margin-top: 12px;
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-muted);
}

/* ── Platform Chips ─────────────────────────── */
.platforms {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

.platform-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--surface);
    border: 1px solid var(--border);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition);
}

.platform-chip:hover {
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: 0 2px 12px rgba(99, 102, 241, 0.12);
    transform: translateY(-1px);
}

#chip-youtube svg  { color: #ff0000; }
#chip-instagram svg { color: #e4405f; }
#chip-twitter svg  { color: #1a1d26; }
#chip-facebook svg { color: #1877f2; }

/* ── Search ─────────────────────────────────── */
.search-section {
    padding-bottom: 32px;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 4px;
    box-shadow: var(--shadow);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input-group:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft), var(--shadow);
}

.input-icon {
    flex-shrink: 0;
    margin-left: 14px;
    color: var(--text-muted);
}

.input-group input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 14px 12px;
    font-size: 0.95rem;
    color: var(--text);
    outline: none;
    font-family: inherit;
    min-width: 0;
}

.input-group input::placeholder {
    color: #b0b5c0;
}

.input-group button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 20px;
    border: none;
    border-radius: 9px;
    background: var(--accent);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    white-space: nowrap;
    transition: background var(--transition), transform var(--transition);
}

.input-group button:hover {
    background: var(--accent-hover);
}

.input-group button:active {
    transform: scale(0.97);
}

/* ── Alert ──────────────────────────────────── */
.alert {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 14px;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    animation: fadeSlide 0.3s ease;
}

.alert-error {
    background: var(--red-soft);
    border: 1px solid rgba(239, 68, 68, 0.15);
    color: #b91c1c;
}

.alert-error svg { color: var(--red); }

/* ── Results ────────────────────────────────── */
.results {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 20px;
    animation: fadeSlide 0.4s ease;
}

.preview-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.thumb {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    background: #eef0f5;
}

.thumb-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.video-title {
    padding: 14px 16px;
    font-size: 0.95rem;
    font-weight: 600;
    line-height: 1.35;
    letter-spacing: -0.01em;
}

/* ── Formats Card ───────────────────────────── */
.formats-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow);
}

.formats-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 16px;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ── Format List ────────────────────────────── */
.format-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 480px;
    overflow-y: auto;
    padding-right: 4px;
}

.format-list::-webkit-scrollbar { width: 6px; }
.format-list::-webkit-scrollbar-track { background: transparent; }
.format-list::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 3px; }

.format-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 11px 14px;
    border-radius: var(--radius);
    background: var(--bg);
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    transition: all var(--transition);
    cursor: pointer;
}

.format-row:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.1);
}

.format-row:hover .dl-icon {
    color: var(--accent);
}

.dl-icon {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: color var(--transition);
}

.format-info {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    min-width: 0;
}

.q-label {
    font-weight: 600;
    font-size: 0.9rem;
}

.q-ext {
    padding: 2px 8px;
    border-radius: 6px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.q-badge {
    padding: 2px 8px;
    border-radius: 6px;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.q-badge-video\+audio {
    background: var(--green-soft);
    color: var(--green);
}

.q-badge-video {
    background: var(--accent-soft);
    color: var(--accent);
}

.q-badge-audio {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

/* ── Footer ─────────────────────────────────── */
.footer {
    margin-top: auto;
    padding: 40px 0 24px;
    text-align: center;
}

.footer p {
    font-size: 0.8rem;
    color: #b0b5c0;
}

/* ── Animations ─────────────────────────────── */
@keyframes fadeSlide {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Responsive ─────────────────────────────── */
@media (max-width: 640px) {
    .hero { padding: 24px 0 20px; }

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

    .quality-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .platforms {
        gap: 8px;
    }

    .platform-chip {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
}