/* ============================================
   UI Primitives (v2 design layer)
   ============================================
   Load order: base.css (tokens) → shared.css (shell, modals) → ui.css → page css.
   Page-agnostic building blocks shared by home / studio / explore / make.
   Everything is prefixed `ui-` so it never collides with legacy page classes;
   state classes are `is-*` (e.g. .ui-chip.is-active).
   ============================================ */

/* ---------- Page frame ---------- */

.ui-page {
    width: 100%;
    max-width: var(--content-max);
    margin: 0 auto;
}

/* ---------- Section header: [eyebrow / title] ........ [link] ---------- */

.ui-section-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.ui-section-head__text {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.ui-section-head__eyebrow {
    font-family: var(--font-display);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-400);
}

.ui-section-head__title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    font-family: var(--font-display);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.ui-section-head__icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
    flex-shrink: 0;
    filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.35));
}

.ui-section-head__icon-slot {
    display: inline-flex;
    align-items: center;
}

.ui-section-head__icon--emoji {
    display: inline-grid;
    place-items: center;
    font-size: 24px;
    line-height: 1;
}

.ui-section-head__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px 0 14px;
    border-radius: var(--radius-full);
    border: 1px solid var(--line-1);
    background: var(--surface-1);
    color: var(--text-tertiary);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition: color var(--duration-fast) ease, background var(--duration-fast) ease, border-color var(--duration-fast) ease;
}

.ui-section-head__link:hover {
    color: #fff;
    background: var(--accent-soft);
    border-color: var(--line-accent);
}

/* ---------- Buttons ---------- */

.ui-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    height: 42px;
    padding: 0 18px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--line-2);
    background: var(--surface-2);
    color: var(--text-secondary);
    font-family: var(--font-primary);
    font-size: 14px;
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: transform var(--duration-fast) ease, filter var(--duration-fast) ease, background var(--duration-fast) ease, border-color var(--duration-fast) ease, color var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

.ui-btn:hover {
    color: #fff;
    background: var(--surface-3);
    border-color: rgba(255, 255, 255, 0.2);
}

.ui-btn:active {
    transform: scale(0.98);
}

.ui-btn:disabled {
    opacity: 0.5;
    cursor: default;
    transform: none;
}

.ui-btn--primary {
    background: var(--gradient-primary);
    border-color: rgba(255, 255, 255, 0.14);
    color: #fff;
    box-shadow: var(--glow-accent), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.ui-btn--primary:hover {
    background: var(--gradient-primary);
    border-color: rgba(255, 255, 255, 0.2);
    filter: brightness(1.08);
    transform: translateY(-1px);
    box-shadow: 0 14px 34px -8px rgba(124, 58, 237, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.ui-btn--gold {
    background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
    border-color: rgba(255, 255, 255, 0.25);
    color: #3b2604;
    box-shadow: 0 10px 28px -10px rgba(245, 158, 11, 0.7);
}

.ui-btn--gold:hover {
    background: linear-gradient(135deg, #fde68a 0%, #fbbf24 100%);
    color: #3b2604;
    transform: translateY(-1px);
}

.ui-btn--ghost {
    background: transparent;
    border-color: transparent;
}

.ui-btn--danger:hover {
    color: #fecaca;
    background: rgba(240, 82, 95, 0.14);
    border-color: rgba(240, 82, 95, 0.45);
}

.ui-btn--sm {
    height: 34px;
    padding: 0 12px;
    border-radius: var(--radius-lg);
    font-size: 13px;
}

.ui-btn--icon {
    width: 42px;
    padding: 0;
}

.ui-btn svg,
.ui-btn img {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* ---------- Chips (filters, genres) ---------- */

.ui-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 34px;
    padding: 0 14px;
    border-radius: var(--radius-full);
    border: 1px solid var(--line-1);
    background: var(--surface-1);
    color: var(--text-tertiary);
    font-family: var(--font-primary);
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    cursor: pointer;
    transition: color var(--duration-fast) ease, background var(--duration-fast) ease, border-color var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.ui-chip:hover {
    color: #fff;
    background: var(--surface-2);
    border-color: var(--line-2);
}

.ui-chip.is-active {
    color: #fff;
    background: var(--accent-soft);
    border-color: var(--line-accent);
    box-shadow: inset 0 0 0 1px rgba(167, 139, 250, 0.15);
}

.ui-chip__icon {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

.ui-chip__icon--emoji {
    display: inline-grid;
    place-items: center;
    font-size: 15px;
    line-height: 1;
}

/* Horizontal chip rail — scrolls instead of wrapping */
.ui-chip-rail {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    scrollbar-width: none;
    padding: 2px;
    mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent);
    -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 32px), transparent);
}

.ui-chip-rail::-webkit-scrollbar {
    display: none;
}

/* ---------- Segmented control ---------- */

.ui-segmented {
    display: inline-flex;
    padding: 4px;
    gap: 2px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--line-1);
}

/* ---------- Surfaces ---------- */

.ui-panel {
    background: var(--surface-1);
    border: 1px solid var(--line-1);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-card);
}

/* ---------- Search input ---------- */

.ui-search {
    position: relative;
    display: flex;
    align-items: center;
}

.ui-search__icon {
    position: absolute;
    left: 14px;
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

.ui-search input {
    width: 100%;
    height: 40px;
    padding: 0 14px 0 40px;
    border-radius: var(--radius-full);
    border: 1px solid var(--line-1);
    background: rgba(0, 0, 0, 0.22);
    color: #fff;
    font-family: var(--font-primary);
    font-size: 14px;
    transition: border-color var(--duration-fast) ease, background var(--duration-fast) ease, box-shadow var(--duration-fast) ease;
}

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

.ui-search input:focus {
    outline: none;
    border-color: var(--line-accent);
    background: rgba(0, 0, 0, 0.32);
    box-shadow: var(--focus-ring);
}

/* ---------- Empty state ---------- */

.ui-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 48px 24px;
    text-align: center;
    border: 1px dashed var(--line-2);
    border-radius: var(--radius-2xl);
    background: radial-gradient(60% 80% at 50% 0%, var(--accent-softer), transparent 70%);
    color: var(--text-tertiary);
}

.ui-empty__icon {
    font-size: 40px;
    line-height: 1;
    margin-bottom: 6px;
    filter: drop-shadow(0 6px 14px rgba(0, 0, 0, 0.4));
}

.ui-empty__title {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-secondary);
}

.ui-empty__desc {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted);
}

.ui-empty .ui-btn {
    margin-top: 10px;
}

/* ---------- Neon CTA (big moments only: home CTA band, create tiles) ---------- */

.ui-btn--cta {
    background: var(--gradient-cta);
    border-color: rgba(255, 255, 255, 0.18);
    color: #fff;
    box-shadow: 0 14px 36px -12px rgba(219, 39, 119, 0.7), 0 10px 30px -12px rgba(124, 58, 237, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.ui-btn--cta:hover {
    background: var(--gradient-cta);
    filter: brightness(1.08);
    transform: translateY(-1px);
}

/* ---------- Site footer (fragments/footer.html) ---------- */

.site-footer {
    margin-top: var(--space-16);
    padding: 40px 0 28px;
    border-top: 1px solid var(--line-1);
    position: relative;
}

.site-footer__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) repeat(3, minmax(0, 1fr));
    gap: 32px;
    max-width: var(--content-max);
    margin: 0 auto;
}

.site-footer__logo {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: #fff;
    text-decoration: none;
    font-family: var(--font-brand);
    font-size: 19px;
    font-weight: 700;
}

.site-footer__logo img {
    width: 34px;
    height: 34px;
    object-fit: contain;
}

.site-footer__tagline {
    margin: 10px 0 16px;
    max-width: 320px;
    font-size: 13.5px;
    line-height: 1.55;
    color: var(--text-tertiary);
}

.site-footer__col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.site-footer__col h4 {
    margin: 4px 0 4px;
    font-family: var(--font-display);
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-muted);
}

.site-footer__col a {
    width: fit-content;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color var(--duration-fast) ease;
}

.site-footer__col a:hover {
    color: #fff;
}

.site-footer__bottom {
    max-width: var(--content-max);
    margin: 32px auto 0;
    padding-top: 18px;
    border-top: 1px solid var(--line-1);
    font-size: 12px;
    color: var(--text-muted);
}

@media (max-width: 900px) {
    .site-footer__inner {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .site-footer__brand {
        grid-column: 1 / -1;
    }
}

/* ---------- Motion ---------- */

@keyframes ui-rise {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
    .ui-btn,
    .ui-chip {
        transition: none;
    }
}