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

:root {
    --bg: #fafafa;
    --surface: #ffffff;
    --surface-hover: #f9fafb;
    --border: #e5e7eb;
    --border-hover: #d1d5db;
    --text: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;
    --success: #059669;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --danger-border: #fecaca;
    --card-thumb-bg: #f3f4f6;
    --card-check-bg: rgba(255,255,255,.9);
    --card-check-border: #d1d5db;
    --card-action-bg: rgba(255,255,255,.92);
    --card-action-bg-hover: #ffffff;
    --header-bg: rgba(255,255,255,.85);
    --lightbox-backdrop: rgba(0,0,0,.6);
    --lightbox-close-bg: rgba(0,0,0,.5);
    --lightbox-close-hover: rgba(0,0,0,.7);
    --overlay-bg: rgba(0,0,0,.4);
    --selection-box-bg: rgba(37,99,235,.08);
    --selection-box-border: rgba(37,99,235,.4);
    --filter-bg: #f3f4f6;
    --filter-active-bg: var(--primary);
    --filter-active-text: #fff;
    --filter-text: var(--text-secondary);
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,.08), 0 2px 4px rgba(0,0,0,.04);
    --shadow-lg: 0 10px 30px rgba(0,0,0,.1), 0 4px 8px rgba(0,0,0,.06);
    --transition: 150ms ease;
}

/* ── Dark Mode ── */
[data-theme="dark"] {
    --bg: #0f0f0f;
    --surface: #1a1a1a;
    --surface-hover: #222222;
    --border: #2a2a2a;
    --border-hover: #3a3a3a;
    --text: #e5e5e5;
    --text-secondary: #a0a0a0;
    --text-tertiary: #666666;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --primary-light: #1e293b;
    --primary-border: #1e40af;
    --danger-bg: #2d1b1b;
    --danger-border: #5c2020;
    --card-thumb-bg: #222222;
    --card-check-bg: rgba(30,30,30,.9);
    --card-check-border: #444;
    --card-action-bg: rgba(30,30,30,.92);
    --card-action-bg-hover: #2a2a2a;
    --header-bg: rgba(15,15,15,.85);
    --overlay-bg: rgba(0,0,0,.6);
    --selection-box-bg: rgba(59,130,246,.1);
    --selection-box-border: rgba(59,130,246,.5);
    --filter-bg: #222;
    --filter-text: #999;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.2);
    --shadow: 0 1px 3px rgba(0,0,0,.3), 0 1px 2px rgba(0,0,0,.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,.3), 0 2px 4px rgba(0,0,0,.2);
    --shadow-lg: 0 10px 30px rgba(0,0,0,.4), 0 4px 8px rgba(0,0,0,.3);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
    transition: background .3s ease, color .3s ease;
}

/* ── Header ── */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: background .3s ease, border-color .3s ease;
}
.header-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--text);
    text-decoration: none;
}
.logo svg { color: var(--primary); }
.header-right-always { display: flex; align-items: center; gap: 4px; }
.header-actions { display: flex; align-items: center; gap: 4px; }

/* ── Dark Mode Toggle ── */
.dark-toggle { padding: 8px; border-radius: 50%; }
.dark-toggle .icon-moon { display: none; }
[data-theme="dark"] .dark-toggle .icon-sun { display: none; }
[data-theme="dark"] .dark-toggle .icon-moon { display: block; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: inherit;
    font-weight: 500;
    font-size: .875rem;
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
    transition: all var(--transition);
    padding: 8px 16px;
    white-space: nowrap;
}
.btn:disabled { opacity: .45; pointer-events: none; }
.btn-sm { padding: 6px 12px; font-size: .8125rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-outline {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--border-hover); background: var(--surface-hover); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { color: var(--text); background: var(--surface-hover); }

/* ── Spinner ── */
.spinner { animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.btn-loader { display: inline-flex; }

/* ── Hero ── */
.hero {
    display: flex;
    justify-content: center;
    padding: 80px 24px 60px;
    text-align: center;
}
.hero-content { max-width: 600px; }
.hero h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -.02em;
    line-height: 1.2;
    margin-bottom: 12px;
}
.hero-sub {
    color: var(--text-secondary);
    font-size: 1.0625rem;
    margin-bottom: 32px;
}

/* ── Search Form ── */
.search-form { width: 100%; }
.search-input-wrap {
    display: flex;
    align-items: center;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    padding: 4px 4px 4px 14px;
    transition: border-color var(--transition), box-shadow var(--transition), background .3s ease;
}
.search-input-wrap:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.search-icon { color: var(--text-tertiary); flex-shrink: 0; }
.search-input-wrap input {
    flex: 1;
    border: none;
    outline: none;
    font-family: inherit;
    font-size: .9375rem;
    padding: 10px 12px;
    background: transparent;
    color: var(--text);
    min-width: 0;
}
.search-input-wrap input::placeholder { color: var(--text-tertiary); }
.search-input-wrap .btn { flex-shrink: 0; border-radius: var(--radius-sm); padding: 10px 20px; }

.search-hints {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 14px;
    justify-content: center;
    font-size: .8125rem;
    color: var(--text-tertiary);
}
.hint-chip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 4px 12px;
    font-family: inherit;
    font-size: .8125rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}
.hint-chip:hover { border-color: var(--primary-border); color: var(--primary); background: var(--primary-light); }

/* ── Toast ── */
.toast {
    position: fixed;
    top: 72px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--danger-bg);
    border: 1px solid var(--danger-border);
    color: var(--danger);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: .875rem;
    font-weight: 500;
    z-index: 200;
    box-shadow: var(--shadow-md);
    animation: slideDown .25s ease;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ── Channel Bar ── */
.channel-bar {
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px 24px 0;
}
.channel-info { display: flex; align-items: center; gap: 16px; }
.channel-avatar {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border);
}
.channel-name { font-size: 1.25rem; font-weight: 700; }
.channel-stats { font-size: .8125rem; color: var(--text-secondary); }

/* ── Toolbar ── */
.toolbar {
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px 24px 8px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}
.toolbar-left, .toolbar-right {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}
.selection-count {
    font-size: .8125rem;
    color: var(--text-secondary);
    padding-left: 4px;
}

/* ── Filter Buttons ── */
.filter-btns {
    display: flex;
    background: var(--filter-bg);
    border-radius: var(--radius-xs);
    padding: 3px;
    gap: 2px;
}
.filter-btn {
    font-family: inherit;
    font-size: .75rem;
    font-weight: 500;
    padding: 5px 14px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background: transparent;
    color: var(--filter-text);
    transition: all var(--transition);
}
.filter-btn:hover { color: var(--text); }
.filter-btn.active {
    background: var(--filter-active-bg);
    color: var(--filter-active-text);
    box-shadow: var(--shadow-sm);
}

.quality-picker {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: .8125rem;
    color: var(--text-secondary);
}
.select-input {
    font-family: inherit;
    font-size: .8125rem;
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition), background .3s ease;
}
.select-input:focus { border-color: var(--primary); }

/* ── Drag hint ── */
.drag-hint {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: .75rem;
    color: var(--text-tertiary);
}

/* ── Grid Wrap (for drag selection) ── */
.grid-wrap {
    position: relative;
    max-width: 1280px;
    margin: 0 auto;
    user-select: none;
    -webkit-user-select: none;
}
body.is-dragging, body.is-dragging * { cursor: crosshair !important; }

/* ── Grid ── */
.grid {
    padding: 0 24px 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

/* ── Selection Box ── */
.selection-box {
    position: fixed;
    border: 2px solid var(--selection-box-border);
    background: var(--selection-box-bg);
    border-radius: 4px;
    pointer-events: none;
    z-index: 90;
    display: none;
}

/* ── Card ── */
.card {
    position: relative;
    background: var(--surface);
    border: 1.5px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card.hidden-by-filter { display: none; }
.card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-md); transform: translateY(-1px); }
.card.selected { border-color: var(--primary); box-shadow: 0 0 0 2px rgba(37,99,235,.18); }
.card.drag-hover { border-color: var(--primary); opacity: .85; }

.card-thumb-wrap {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--card-thumb-bg);
}
.card-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s ease;
}
.card:hover .card-thumb { transform: scale(1.03); }

/* Shorts badge */
.card-badge {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0,0,0,.7);
    color: #fff;
    font-size: .6875rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 4px;
    z-index: 2;
    text-transform: uppercase;
    letter-spacing: .03em;
}

.card-check {
    position: absolute;
    top: 10px;
    left: 10px;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--card-check-bg);
    border: 2px solid var(--card-check-border);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    z-index: 2;
}
.card-check svg { opacity: 0; transition: opacity var(--transition); color: #fff; }
.card.selected .card-check { background: var(--primary); border-color: var(--primary); }
.card.selected .card-check svg { opacity: 1; }

.card-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 6px;
    opacity: 0;
    transition: opacity var(--transition);
    z-index: 2;
}
.card:hover .card-actions { opacity: 1; }

.card-action-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--card-action-bg);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition);
    box-shadow: var(--shadow-sm);
}
.card-action-btn:hover { background: var(--card-action-bg-hover); color: var(--text); box-shadow: var(--shadow); }

.card-body { padding: 12px 14px; }
.card-title {
    font-size: .8125rem;
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--text);
}
.card-date {
    font-size: .75rem;
    color: var(--text-tertiary);
    margin-top: 4px;
}

/* ── Load More ── */
.load-more-wrap {
    display: flex;
    justify-content: center;
    padding: 8px 24px 48px;
}

/* ── Floating Action Bar ── */
.fab {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 150;
    animation: fabSlideUp .25s ease;
}
@keyframes fabSlideUp {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.fab-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px 16px;
    box-shadow: var(--shadow-lg);
}
.fab-count {
    font-size: .8125rem;
    font-weight: 600;
    color: var(--text);
    padding-right: 4px;
}

/* ── Lightbox ── */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 300;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background: var(--lightbox-backdrop);
    backdrop-filter: blur(4px);
}
.lightbox-content {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    max-width: 90vw;
    max-height: 90vh;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
}
.lightbox-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--lightbox-close-bg);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    z-index: 2;
    transition: background var(--transition);
}
.lightbox-close:hover { background: var(--lightbox-close-hover); }
#lightboxImg { max-width: 900px; max-height: 70vh; object-fit: contain; }
.lightbox-info {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    border-top: 1px solid var(--border);
}
.lightbox-info h3 {
    font-size: .875rem;
    font-weight: 600;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── Download Overlay ── */
.download-overlay {
    position: fixed;
    inset: 0;
    z-index: 400;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--overlay-bg);
    backdrop-filter: blur(4px);
}
.download-modal {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 40px 48px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}
.download-modal p { color: var(--text-secondary); font-size: .9375rem; }
.spinner.big { color: var(--primary); }

/* ── Responsive ── */
@media (max-width: 640px) {
    .hero { padding: 48px 16px 40px; }
    .hero h1 { font-size: 1.625rem; }
    .hero-sub { font-size: .9375rem; }
    .search-input-wrap { flex-direction: column; padding: 8px; gap: 8px; }
    .search-input-wrap input { width: 100%; padding: 10px; }
    .search-input-wrap .btn { width: 100%; justify-content: center; }
    .toolbar { flex-direction: column; align-items: flex-start; }
    .toolbar-right { width: 100%; }
    .grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; padding: 0 16px 24px; }
    .channel-bar, .toolbar, .drag-hint { padding-left: 16px; padding-right: 16px; }
    .card-actions { opacity: 1; }
    .fab-inner { gap: 8px; padding: 8px 12px; }
    .drag-hint { display: none; }
}