/**
 * Smooth UX – include after base styles. Adds:
 * - Smooth scroll
 * - Consistent transition timing for buttons/links/cards
 * - Reduced tap highlight on mobile
 * - Subtle loading pulse (use .smooth-loading-pulse on loading text/containers)
 */
html {
    scroll-behavior: smooth;
}

/* One place to tune “snappiness” (150–250ms feels modern) */
:root {
    --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
    --transition-fast: 0.18s var(--ease-out);
    --transition-normal: 0.25s var(--ease-out);
}

/* Buttons and nav: smooth hover/active */
.unified-btn,
.unified-btn-primary,
.unified-nav-link,
.unified-sidebar-item,
.unified-user-avatar,
.unified-logo {
    transition: color var(--transition-fast), background-color var(--transition-fast),
        border-color var(--transition-fast), transform var(--transition-fast),
        box-shadow var(--transition-fast), opacity var(--transition-fast);
}

/* Cards and sections: subtle hover where applicable */
.post-card,
.home-section,
.home-cta-link,
.home-friends-list a,
.home-stream-list a {
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
        background-color var(--transition-fast), transform var(--transition-fast);
}

/* Reduce grey flash on tap (mobile) */
.unified-btn,
.unified-nav-link,
.unified-sidebar-item,
a,
button {
    -webkit-tap-highlight-color: transparent;
    tap-highlight-color: transparent;
}

/* Consistent focus ring for keyboard users */
.unified-btn,
.unified-btn-primary,
.unified-nav-link,
.unified-sidebar-item,
.unified-logo,
.feed-tab,
button,
input,
select,
textarea,
[tabindex]:not([tabindex="-1"]) {
    outline: none;
}
.unified-btn:focus-visible,
.unified-btn-primary:focus-visible,
.unified-nav-link:focus-visible,
.unified-sidebar-item:focus-visible,
.unified-logo:focus-visible,
.feed-tab:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary, #1a1a1a);
    outline-offset: 2px;
}

/* Active state: tactile click feedback */
.unified-btn:active,
.unified-btn-primary:active,
button:not(:disabled):active {
    transform: scale(0.98);
}

/* Disabled state for submit/save */
.btn-disabled,
button:disabled,
.unified-btn[aria-busy="true"] {
    opacity: 0.7;
    pointer-events: none;
    cursor: not-allowed;
}

/* Reserve space for lists to reduce layout shift */
.list-reserve-feed { min-height: 200px; }
.list-reserve-conversations { min-height: 160px; }
.list-reserve-streams { min-height: 280px; }
.list-reserve-friends { min-height: 120px; }
.list-reserve-users { min-height: 200px; }

/* Skeleton loaders */
.skeleton { background: linear-gradient(90deg, var(--border, rgba(26,26,26,0.1)) 25%, rgba(26,26,26,0.08) 50%, var(--border, rgba(26,26,26,0.1)) 75%); background-size: 200% 100%; animation: skeleton-shine 1.2s ease-in-out infinite; border-radius: var(--radius, 8px); }
@keyframes skeleton-shine { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }
.skeleton-card { height: 100px; margin-bottom: 16px; }
.skeleton-line { height: 14px; margin-bottom: 8px; }
.skeleton-line.short { width: 40%; }
.skeleton-avatar { width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0; }
.skeleton-stream-card { aspect-ratio: 280 / 220; min-height: 180px; }

/* Stagger list appearance */
.stagger-in { animation: stagger-fade 0.35s var(--ease-out) both; }
@keyframes stagger-fade {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Optional: use on loading containers for a calm pulse */
.smooth-loading-pulse {
    animation: smooth-pulse 1.2s ease-in-out infinite;
}

@keyframes smooth-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* ── Unified Footer (reusable component, matches sidebar aesthetic) ── */
.unified-footer {
    width: 100%;
    margin-top: auto;
    flex-shrink: 0;
    border-top: 2px solid var(--primary, #1a1a1a);
    background: var(--bg-light, #ffffff);
    padding: 24px 24px 32px;
    text-align: center;
}
.unified-footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}
.unified-footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 4px 8px;
    margin-bottom: 12px;
}
.unified-footer-links a {
    color: var(--primary, #1a1a1a);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    padding: 4px 8px;
    border-radius: 4px;
    transition: background-color 0.2s, color 0.2s;
}
.unified-footer-links a:hover {
    background: rgba(26, 26, 26, 0.06);
}
.unified-footer-sep {
    color: var(--text-muted, #666);
    font-weight: 400;
    user-select: none;
}
.unified-footer-copy {
    font-size: 0.7rem;
    color: var(--text-muted, #666);
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}
@media (max-width: 480px) {
    .unified-footer { padding: 20px 16px 24px; }
    .unified-footer-links { gap: 2px 6px; }
    .unified-footer-links a { font-size: 0.65rem; padding: 2px 4px; }
}

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .unified-btn, .unified-btn-primary, .unified-nav-link, .unified-sidebar-item,
    .unified-user-avatar, .unified-logo, .post-card, .home-section, .home-cta-link,
    .home-friends-list a, .home-stream-list a {
        transition: none;
    }
    .unified-btn:active, .unified-btn-primary:active, button:not(:disabled):active { transform: none; }
    .smooth-loading-pulse { animation: none; }
    .skeleton { animation: none; background: var(--border, rgba(26,26,26,0.1)); }
    .stagger-in { animation: none; }
}