/**
 * Native App Shell — Flutter / iOS / Material / Next.js feel
 * Motion tokens, elevations, press feedback, page transitions,
 * floating tab bar, skeletons, reactive surfaces.
 */

:root {
    /* Motion — Material 3 + Flutter-like springs */
    --ease-standard: cubic-bezier(0.2, 0, 0, 1);
    --ease-emphasized: cubic-bezier(0.2, 0, 0, 1);
    --ease-decelerate: cubic-bezier(0, 0, 0, 1);
    --ease-accelerate: cubic-bezier(0.3, 0, 1, 1);
    --ease-spring: cubic-bezier(0.34, 1.45, 0.64, 1);
    --ease-bounce: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --dur-instant: 100ms;
    --dur-fast: 160ms;
    --dur-base: 240ms;
    --dur-slow: 360ms;
    --dur-page: 420ms;

    /* Elevation (Material-like) */
    --elev-0: none;
    --elev-1: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.04);
    --elev-2: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.04);
    --elev-3: 0 12px 28px rgba(15, 23, 42, 0.12), 0 4px 10px rgba(15, 23, 42, 0.06);
    --elev-4: 0 20px 40px rgba(15, 23, 42, 0.16), 0 8px 16px rgba(15, 23, 42, 0.08);

    /* Surface tokens (Next.js / shadcn-like) */
    --surface-1: var(--color-card);
    --surface-2: color-mix(in srgb, var(--color-card) 92%, var(--color-primary) 8%);
    --surface-hover: color-mix(in srgb, var(--color-primary) 6%, var(--color-card));
    --ring: color-mix(in srgb, var(--color-primary) 35%, transparent);
    --press-scale: 0.97;
}

body.theme-dark {
    --elev-1: 0 1px 2px rgba(0, 0, 0, 0.35), 0 1px 3px rgba(0, 0, 0, 0.25);
    --elev-2: 0 4px 14px rgba(0, 0, 0, 0.4), 0 2px 6px rgba(0, 0, 0, 0.3);
    --elev-3: 0 14px 32px rgba(0, 0, 0, 0.5), 0 6px 12px rgba(0, 0, 0, 0.35);
    --elev-4: 0 22px 44px rgba(0, 0, 0, 0.55), 0 10px 18px rgba(0, 0, 0, 0.4);
    --surface-hover: color-mix(in srgb, var(--color-primary) 12%, var(--color-card));
}

/* ─── App chrome baseline ─── */
html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-behavior: smooth;
}

html,
body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: "kern" 1, "liga" 1;
}

/* Standalone PWA: solid app canvas (less “website”, more native) */
@media all and (display-mode: standalone) {
    html,
    body {
        background-image: none;
        background-color: var(--color-background);
    }

    body {
        /* iOS rubber-band overscroll tint */
        overscroll-behavior-y: none;
    }
}

/* ─── Top navigation progress (Next.js style) ─── */
#app-nprogress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    z-index: 10050;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--dur-fast) var(--ease-standard);
}

#app-nprogress.is-active {
    opacity: 1;
}

#app-nprogress .bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(
        90deg,
        var(--color-primary),
        var(--color-accent),
        var(--color-primary)
    );
    background-size: 200% 100%;
    box-shadow: 0 0 12px color-mix(in srgb, var(--color-primary) 60%, transparent);
    border-radius: 0 2px 2px 0;
    transition: width var(--dur-base) var(--ease-decelerate);
    animation: nprogress-shimmer 1.2s linear infinite;
}

@keyframes nprogress-shimmer {
    0% { background-position: 100% 0; }
    100% { background-position: -100% 0; }
}

/* ─── Page enter (Flutter route-like) ─── */
.app-page {
    animation: app-page-enter var(--dur-page) var(--ease-decelerate) both;
}

@keyframes app-page-enter {
    from {
        opacity: 0;
        transform: translateY(10px) scale(0.992);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* Stagger reveal children */
.app-reveal {
    opacity: 0;
    transform: translateY(14px);
    transition:
        opacity var(--dur-slow) var(--ease-decelerate),
        transform var(--dur-slow) var(--ease-spring);
    will-change: opacity, transform;
}

.app-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ─── Pressable / reactive controls ─── */
.ui-btn,
.sidebar-nav a,
.sidebar-footer-btn,
.mobile-menu-toggle,
.pwa-nav-item,
.nav-link,
.nav-cta,
.hero-btn,
.filters-toggle-btn,
.mobile-toggle {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition:
        transform var(--dur-fast) var(--ease-spring),
        background-color var(--dur-base) var(--ease-standard),
        color var(--dur-base) var(--ease-standard),
        border-color var(--dur-base) var(--ease-standard),
        box-shadow var(--dur-base) var(--ease-standard),
        opacity var(--dur-fast) var(--ease-standard);
}

.ui-btn:active:not(:disabled),
.sidebar-footer-btn:active,
.mobile-menu-toggle:active,
.filters-toggle-btn:active,
.mobile-toggle:active,
.nav-link:active,
.nav-cta:active,
.hero-btn:active {
    transform: scale(var(--press-scale));
}

.ui-btn:disabled,
.ui-btn.is-loading {
    opacity: 0.62;
    pointer-events: none;
    cursor: not-allowed;
}

.ui-btn.is-loading {
    position: relative;
    color: transparent !important;
}

.ui-btn.is-loading::after {
    content: '';
    position: absolute;
    width: 1.1rem;
    height: 1.1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: app-spin 0.7s linear infinite;
    color: #fff;
    inset: 0;
    margin: auto;
}

.ui-btn-ghost.is-loading::after,
.ui-btn-outline.is-loading::after,
.ui-btn-secondary.is-loading::after {
    color: var(--color-primary);
}

@keyframes app-spin {
    to { transform: rotate(360deg); }
}

/* Elevated primary buttons (Material FAB-ish fill) */
.ui-btn-primary {
    box-shadow: 0 2px 8px color-mix(in srgb, var(--color-primary) 28%, transparent);
}

.ui-btn-primary:hover {
    box-shadow: 0 6px 16px color-mix(in srgb, var(--color-primary) 36%, transparent);
}

.ui-btn-primary:active {
    box-shadow: 0 1px 4px color-mix(in srgb, var(--color-primary) 30%, transparent);
}

/* Focus rings — accessible Next/shadcn style */
.ui-btn:focus-visible,
.ui-input:focus-visible,
.ui-select:focus-visible,
.ui-textarea:focus-visible,
.sidebar-nav a:focus-visible,
.pwa-nav-item:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--ring);
}

/* ─── Cards as Material surfaces ─── */
.ui-card {
    box-shadow: var(--elev-1);
    border-color: color-mix(in srgb, var(--color-border) 85%, transparent);
    transition:
        transform var(--dur-base) var(--ease-spring),
        box-shadow var(--dur-base) var(--ease-standard),
        background-color var(--dur-base) var(--ease-standard),
        border-color var(--dur-base) var(--ease-standard);
}

@media (hover: hover) and (pointer: fine) {
    .ui-card:hover {
        box-shadow: var(--elev-2);
        transform: translateY(-2px);
    }

    .dashboard-metrics .ui-card:hover,
    .auth-card.ui-card:hover,
    .ui-card.no-lift:hover {
        transform: none;
        box-shadow: var(--elev-1);
    }
}

/* Inputs — reactive filled/outlined hybrid */
.ui-input,
.ui-select,
.ui-textarea {
    transition:
        border-color var(--dur-fast) var(--ease-standard),
        box-shadow var(--dur-fast) var(--ease-standard),
        background-color var(--dur-fast) var(--ease-standard),
        transform var(--dur-fast) var(--ease-standard);
}

.ui-input:focus,
.ui-select:focus,
.ui-textarea:focus {
    transform: translateY(-1px);
}

/* Alerts slide-in */
.ui-alert {
    animation: app-alert-in var(--dur-base) var(--ease-spring) both;
}

@keyframes app-alert-in {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Badges — snappy chip feel */
.badge,
.ui-badge,
.nav-badge {
    transition: transform var(--dur-fast) var(--ease-spring), background-color var(--dur-base) ease;
}

.nav-badge {
    animation: badge-pop var(--dur-base) var(--ease-spring) both;
}

@keyframes badge-pop {
    from { transform: scale(0.6); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

/* ─── Skeleton / shimmer (loading surfaces) ─── */
.app-skeleton {
    position: relative;
    overflow: hidden;
    background: color-mix(in srgb, var(--color-border) 55%, var(--color-card));
    border-radius: 8px;
    color: transparent !important;
    pointer-events: none;
    user-select: none;
}

.app-skeleton::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        color-mix(in srgb, #fff 45%, transparent) 50%,
        transparent 100%
    );
    transform: translateX(-100%);
    animation: skeleton-shine 1.4s var(--ease-standard) infinite;
}

body.theme-dark .app-skeleton::after {
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.08) 50%,
        transparent 100%
    );
}

@keyframes skeleton-shine {
    100% { transform: translateX(100%); }
}

/* ─── Floating native tab bar (iOS / Flutter NavigationBar) ─── */
@media (max-width: 768px), all and (display-mode: standalone) {
    :root {
        --nav-height: 68px;
        --tab-inset: 10px;
    }

    body {
        padding-bottom: calc(var(--nav-height) + var(--safe-bottom) + var(--tab-inset) + 0.75rem) !important;
    }

    .guest-main {
        padding-bottom: calc(var(--nav-height) + var(--safe-bottom) + var(--tab-inset) + 0.5rem);
    }

    .pwa-bottom-nav {
        left: var(--tab-inset);
        right: var(--tab-inset);
        bottom: calc(var(--tab-inset) + var(--safe-bottom));
        height: var(--nav-height);
        padding-bottom: 0;
        border-radius: 22px;
        border: 1px solid var(--glass-border);
        background: color-mix(in srgb, var(--color-card) 82%, transparent);
        box-shadow: var(--elev-3);
        overflow: visible;
    }

    @supports (backdrop-filter: blur(20px)) or (-webkit-backdrop-filter: blur(20px)) {
        .pwa-bottom-nav {
            backdrop-filter: blur(28px) saturate(180%);
            -webkit-backdrop-filter: blur(28px) saturate(180%);
        }
    }

    body.theme-dark .pwa-bottom-nav {
        background: color-mix(in srgb, #0f172a 88%, transparent);
        border-color: rgba(255, 255, 255, 0.08);
    }

    .pwa-nav-item {
        position: relative;
        border-radius: 16px;
        margin: 6px 2px;
        gap: 0.15rem;
        font-size: 0.66rem;
        letter-spacing: 0.01em;
        transition:
            color var(--dur-fast) var(--ease-standard),
            transform var(--dur-fast) var(--ease-spring),
            background-color var(--dur-fast) var(--ease-standard);
    }

    .pwa-nav-item:active:not(.pwa-nav-item-center) {
        transform: scale(0.92);
        background: color-mix(in srgb, var(--color-primary) 10%, transparent);
    }

    /* Active pill indicator behind icon (Flutter NavBar) */
    .pwa-nav-item.active:not(.pwa-nav-item-center)::before {
        content: '';
        position: absolute;
        top: 4px;
        left: 50%;
        width: 48px;
        height: 28px;
        transform: translateX(-50%);
        border-radius: 999px;
        background: color-mix(in srgb, var(--color-primary) 16%, transparent);
        z-index: -1;
        animation: tab-pill-in var(--dur-base) var(--ease-spring) both;
    }

    @keyframes tab-pill-in {
        from { transform: translateX(-50%) scaleX(0.55); opacity: 0; }
        to { transform: translateX(-50%) scaleX(1); opacity: 1; }
    }

    .pwa-nav-item.active {
        color: var(--color-primary);
        font-weight: 700;
    }

    .pwa-nav-item.active svg {
        transform: translateY(-1px) scale(1.08);
        stroke-width: 2.35;
    }

    .pwa-nav-item-center {
        top: -16px;
        width: 58px;
        height: 58px;
        max-width: 58px;
        border-radius: 50%;
        border: 3px solid var(--color-background);
        box-shadow:
            0 8px 20px color-mix(in srgb, var(--color-primary) 40%, transparent),
            0 2px 6px rgba(0, 0, 0, 0.12);
        transition: transform var(--dur-fast) var(--ease-spring), box-shadow var(--dur-base) ease;
    }

    .pwa-nav-item-center:active {
        transform: scale(0.9) translateY(-12px);
    }

    .pwa-nav-item-center.active {
        box-shadow:
            0 10px 24px color-mix(in srgb, var(--color-primary) 50%, transparent),
            0 0 0 4px color-mix(in srgb, var(--color-primary) 18%, transparent);
    }

    /* Compact mobile header like app bar */
    .mobile-header {
        border-bottom: none;
        background: color-mix(in srgb, var(--color-background) 75%, transparent);
        box-shadow: none;
    }

    @supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
        .mobile-header {
            backdrop-filter: blur(20px) saturate(160%);
            -webkit-backdrop-filter: blur(20px) saturate(160%);
        }
    }

    .mobile-header::after {
        content: '';
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        height: 1px;
        background: linear-gradient(
            90deg,
            transparent,
            var(--color-border),
            transparent
        );
        opacity: 0.9;
    }

    .mobile-header {
        position: sticky;
    }
}

/* ─── Sidebar drawer spring (Material NavigationDrawer) ─── */
@media (max-width: 1100px) {
    .sidebar {
        transition:
            transform var(--dur-slow) var(--ease-emphasized),
            visibility var(--dur-slow) var(--ease-standard),
            box-shadow var(--dur-base) ease;
    }

    .sidebar.is-open {
        box-shadow: var(--elev-4);
    }

    .sidebar-overlay {
        backdrop-filter: blur(2px);
        -webkit-backdrop-filter: blur(2px);
        transition: opacity var(--dur-base) var(--ease-standard), visibility var(--dur-base) ease;
    }

    .sidebar-nav a {
        border-radius: 12px;
    }

    .sidebar-nav a.active {
        box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.08);
    }

    .sidebar-nav a:active {
        transform: scale(0.98);
    }
}

/* ─── Table rows reactive ─── */
.ui-table tbody tr {
    transition: background-color var(--dur-fast) var(--ease-standard);
}

.ui-table tbody tr:active {
    background: color-mix(in srgb, var(--color-primary) 8%, transparent);
}

/* ─── Section headers — app title style ─── */
.section-header h1 {
    font-weight: 800;
    letter-spacing: -0.02em;
    font-size: clamp(1.35rem, 2.5vw, 1.75rem);
}

/* Metric numbers — dashboard “live” feel */
.metric-value {
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.02em;
    transition: color var(--dur-base) ease, transform var(--dur-fast) var(--ease-spring);
}

/* ─── Property / public cards if present ─── */
.property-card,
.stat-item,
.filter-card,
.details-card {
    transition:
        transform var(--dur-base) var(--ease-spring),
        box-shadow var(--dur-base) var(--ease-standard),
        border-color var(--dur-base) ease;
}

@media (hover: hover) and (pointer: fine) {
    .property-card:hover,
    .stat-item:hover {
        transform: translateY(-3px);
        box-shadow: var(--elev-2);
    }
}

.property-card:active,
.stat-item:active {
    transform: scale(0.985);
}

/* ─── View Transitions API (Chrome / modern browsers) ─── */
@view-transition {
    navigation: auto;
}

::view-transition-old(root),
::view-transition-new(root) {
    animation-duration: 280ms;
    animation-timing-function: var(--ease-emphasized);
}

/* ─── Reduced motion: keep accessibility ─── */
@media (prefers-reduced-motion: reduce) {
    .app-page,
    .app-reveal,
    .ui-alert,
    .nav-badge,
    #app-nprogress .bar,
    .pwa-nav-item.active:not(.pwa-nav-item-center)::before {
        animation: none !important;
        transition: none !important;
    }

    .app-reveal {
        opacity: 1;
        transform: none;
    }

    .app-page {
        opacity: 1;
        transform: none;
    }

    html {
        scroll-behavior: auto;
    }
}

/* ─── Haptic-ish visual pulse utility ─── */
.app-pulse {
    animation: app-pulse 0.35s var(--ease-spring);
}

@keyframes app-pulse {
    0% { transform: scale(1); }
    40% { transform: scale(0.96); }
    100% { transform: scale(1); }
}

/* Toast / snackbar shell (used by JS if needed) */
.app-snackbar-host {
    position: fixed;
    left: 50%;
    bottom: calc(var(--nav-height, 64px) + var(--safe-bottom, 0px) + 1.25rem);
    transform: translateX(-50%);
    z-index: 10040;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: min(420px, calc(100vw - 1.5rem));
    pointer-events: none;
}

.app-snackbar {
    pointer-events: auto;
    background: #0f172a;
    color: #f8fafc;
    padding: 0.85rem 1rem;
    border-radius: 14px;
    box-shadow: var(--elev-3);
    font-size: 0.9rem;
    font-weight: 600;
    animation: app-snack-in var(--dur-base) var(--ease-spring) both;
}

body.theme-dark .app-snackbar {
    background: #f8fafc;
    color: #0f172a;
}

.app-snackbar.is-leaving {
    animation: app-snack-out var(--dur-fast) var(--ease-accelerate) both;
}

@keyframes app-snack-in {
    from { opacity: 0; transform: translateY(12px) scale(0.96); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

@keyframes app-snack-out {
    to { opacity: 0; transform: translateY(8px) scale(0.96); }
}