/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    height: var(--header-h);
    display: flex;
    align-items: center;
    background: rgba(8, 8, 11, 0.7);
    backdrop-filter: blur(16px) saturate(140%);
    -webkit-backdrop-filter: blur(16px) saturate(140%);
    border-bottom: 1px solid var(--border-subtle);
}

.site-header__inner {
    width: 100%;
    max-width: var(--container-w);
    margin-inline: auto;
    padding-inline: var(--space-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
}

@media (min-width: 768px) { .site-header__inner { padding-inline: var(--space-7); } }

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-weight: 800;
    font-size: 1.15rem;
    letter-spacing: -0.02em;
}

.brand__mark {
    display: inline-grid;
    place-items: center;
    width: 34px; height: 34px;
    border-radius: var(--radius-pill);
    background: var(--accent-grad);
    color: #fff;
    font-size: 1rem;
}

.nav-desktop {
    display: none;
    gap: var(--space-5);
}

@media (min-width: 860px) {
    .nav-desktop { display: flex; }
}

.nav-link {
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--text-secondary);
    padding: var(--space-2) 0;
    border-bottom: 2px solid transparent;
    transition: color var(--dur-base) var(--ease-out), border-color var(--dur-base) var(--ease-out);
}
.nav-link:hover { color: var(--text-primary); }
.nav-link.is-active { color: var(--text-primary); border-color: var(--accent-solid); }

.nav-camera-cta { white-space: nowrap; }

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 3px;
    border-radius: var(--radius-pill);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
}

.lang-switch__item {
    padding: 5px 10px;
    border-radius: var(--radius-pill);
    font-size: var(--fs-xs);
    font-weight: 800;
    letter-spacing: 0.02em;
    color: var(--text-tertiary);
    transition: all var(--dur-fast) var(--ease-out);
}
.lang-switch__item:hover { color: var(--text-primary); }
.lang-switch__item.is-active {
    background: var(--accent-grad);
    color: #fff;
}

/* ---------- Sincronización de carpeta (My Photos) ---------- */
.folder-sync {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}
.folder-sync__status {
    font-size: var(--fs-xs);
    color: var(--text-secondary);
    font-weight: 600;
}

/* ---------- Bottom mobile nav ---------- */
.nav-mobile {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    z-index: var(--z-mobile-nav);
    height: var(--mobile-nav-h);
    padding-bottom: env(safe-area-inset-bottom);
    display: flex;
    align-items: center;
    justify-content: space-around;
    background: rgba(10, 10, 14, 0.85);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border-top: 1px solid var(--border-subtle);
}

@media (min-width: 960px) {
    .nav-mobile { display: none; }
}

.nav-mobile__item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    font-size: 0.65rem;
    color: var(--text-tertiary);
    font-weight: 600;
    flex: 1;
    padding-top: var(--space-2);
    transition: color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.nav-mobile__item:active { transform: scale(0.92); }
.nav-mobile__item.is-active { color: var(--text-primary); }
.nav-mobile__icon { font-size: 1.2rem; }

.nav-mobile__item--camera { margin-top: -28px; }
.nav-mobile__camera-btn {
    display: grid;
    place-items: center;
    width: 56px; height: 56px;
    border-radius: 50%;
    background: var(--accent-grad);
    box-shadow: var(--shadow-glow);
    font-size: 1.4rem;
    border: 3px solid var(--bg-0);
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 14px 24px;
    border-radius: var(--radius-pill);
    font-weight: 700;
    font-size: var(--fs-sm);
    border: 1px solid transparent;
    transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-base) var(--ease-out), background var(--dur-base) var(--ease-out), opacity var(--dur-base);
    white-space: nowrap;
}
.btn:active { transform: scale(0.96); }

.btn--primary {
    background: var(--accent-grad);
    color: #fff;
    box-shadow: 0 8px 24px rgba(124, 92, 255, 0.35);
}
.btn--primary:hover { box-shadow: 0 10px 32px rgba(124, 92, 255, 0.5); }

.btn--ghost {
    background: var(--surface-glass);
    border-color: var(--border-strong);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}
.btn--ghost:hover { background: var(--surface-glass-strong); }

.btn--outline {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text-primary);
}
.btn--outline:hover { background: var(--surface-glass); }

.btn--sm { padding: 10px 18px; font-size: var(--fs-xs); }
.btn--lg { padding: 18px 32px; font-size: 1rem; }
.btn--block { width: 100%; }
.btn--icon {
    padding: 0;
    width: 44px; height: 44px;
    border-radius: 50%;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ---------- Chips / filtros de categoría ---------- */
.chip-row {
    display: flex;
    gap: var(--space-2);
    overflow-x: auto;
    padding-bottom: var(--space-2);
    scrollbar-width: none;
}
.chip-row::-webkit-scrollbar { display: none; }

.chip {
    flex: none;
    padding: 9px 18px;
    border-radius: var(--radius-pill);
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    font-size: var(--fs-sm);
    font-weight: 600;
    color: var(--text-secondary);
    transition: all var(--dur-fast) var(--ease-out);
}
.chip:hover { color: var(--text-primary); border-color: var(--border-strong); }
.chip.is-active {
    background: var(--accent-grad);
    color: #fff;
    border-color: transparent;
}

/* ---------- Glass panel / card base ---------- */
.glass {
    background: var(--surface-glass);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    font-size: var(--fs-xs);
    font-weight: 700;
    background: rgba(255,255,255,0.14);
    color: #fff;
    backdrop-filter: blur(8px);
    text-transform: none;
}

/* ---------- Favorite heart button ---------- */
.fav-btn {
    display: grid;
    place-items: center;
    width: 38px; height: 38px;
    border-radius: 50%;
    background: rgba(10,10,14,0.5);
    backdrop-filter: blur(6px);
    border: 1px solid rgba(255,255,255,0.18);
    font-size: 1.05rem;
    color: #fff;
    transition: transform var(--dur-fast) var(--ease-out), background var(--dur-fast);
}
.fav-btn:hover { transform: scale(1.08); }
.fav-btn.is-active {
    background: rgba(255, 95, 162, 0.9);
    border-color: transparent;
}
.fav-btn.pop { animation: favPop 420ms var(--ease-out); }
@keyframes favPop {
    0% { transform: scale(1); }
    35% { transform: scale(1.35); }
    100% { transform: scale(1); }
}

/* ---------- Skeleton loading ---------- */
.skeleton {
    position: relative;
    overflow: hidden;
    background: var(--bg-3);
}
.skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
    transform: translateX(-100%);
    animation: shimmer 1.6s infinite;
}
@keyframes shimmer {
    100% { transform: translateX(100%); }
}

/* ---------- Toast ---------- */
.toast-wrap {
    position: fixed;
    bottom: calc(var(--mobile-nav-h) + var(--space-4));
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    width: max-content;
    max-width: 90vw;
}
@media (min-width: 960px) { .toast-wrap { bottom: var(--space-5); } }

.toast {
    padding: 12px 20px;
    border-radius: var(--radius-pill);
    background: rgba(20,20,26,0.95);
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-md);
    font-size: var(--fs-sm);
    font-weight: 600;
    animation: toastIn var(--dur-base) var(--ease-out);
}
@keyframes toastIn {
    from { opacity: 0; transform: translateY(12px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.toast.is-leaving { animation: toastOut var(--dur-base) var(--ease-out) forwards; }
@keyframes toastOut {
    to { opacity: 0; transform: translateY(8px) scale(0.96); }
}

/* ---------- Entrance animation helper ---------- */
.reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- Modal / overlay ---------- */
.overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    background: rgba(5,5,8,0.7);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-5);
    animation: fadeIn var(--dur-base) var(--ease-out);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal {
    background: var(--bg-2);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.modal__icon { font-size: 2.4rem; margin-bottom: var(--space-3); }
.modal__title { font-size: var(--fs-h3); margin-bottom: var(--space-2); }
.modal__text { color: var(--text-secondary); font-size: var(--fs-sm); margin-bottom: var(--space-5); }
.modal__actions { display: flex; gap: var(--space-3); flex-direction: column; }

@media (min-width: 560px) {
    .modal__actions { flex-direction: row; }
    .modal__actions .btn { flex: 1; }
}

/* ---------- Banner de instalación PWA ---------- */
.pwa-banner {
    position: fixed;
    left: var(--space-4);
    right: var(--space-4);
    bottom: calc(var(--mobile-nav-h) + var(--space-3));
    z-index: var(--z-toast);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-3) var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    background: rgba(18, 18, 24, 0.95);
    border: 1px solid var(--border-strong);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(16px);
    opacity: 0;
    transform: translateY(16px);
    transition: opacity var(--dur-base) var(--ease-out), transform var(--dur-base) var(--ease-out);
}
.pwa-banner.is-visible { opacity: 1; transform: translateY(0); }

@media (min-width: 960px) {
    .pwa-banner { bottom: var(--space-5); left: auto; right: var(--space-5); max-width: 380px; }
}

.pwa-banner__icon { font-size: 1.6rem; flex: none; }
.pwa-banner__text { display: flex; flex-direction: column; gap: 2px; flex: 1; min-width: 0; }
.pwa-banner__text strong { font-size: var(--fs-sm); }
.pwa-banner__text span { font-size: var(--fs-xs); color: var(--text-secondary); }
.pwa-banner__close {
    flex: none;
    width: 28px; height: 28px;
    border-radius: 50%;
    background: var(--surface-glass);
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.empty-state {
    text-align: center;
    padding: var(--space-9) var(--space-5);
    color: var(--text-secondary);
}
.empty-state__icon { font-size: 3rem; margin-bottom: var(--space-4); }
.empty-state__title { font-size: var(--fs-h3); color: var(--text-primary); margin-bottom: var(--space-2); }