/* ==========================================================================
   Nibzo — Mobile App Shell & Native-like UX
   ========================================================================== */

:root {
    --app-tabbar-h: 64px;
    --app-topbar-h: 118px;
    --app-topbar-top-extra: 0.75rem;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --app-pad-x: max(1rem, var(--safe-left), var(--safe-right));
}

/* App shell */
@media (max-width: 991.98px) {
    html {
        -webkit-tap-highlight-color: transparent;
        scroll-padding-top: calc(var(--app-topbar-h) + 12px);
    }

    body.has-app-shell {
        background: #eef0f3;
        padding-bottom: calc(var(--app-tabbar-h) + var(--safe-bottom) + 12px);
        /* overflow-x on body breaks position:fixed on iOS — clip on html instead */
        overflow-x: visible;
        overflow-y: auto;
    }

    html {
        overflow-x: clip;
        overscroll-behavior-y: none;
    }

    body.has-app-shell .app-main {
        position: relative;
        z-index: 1;
        padding-top: 0;
    }

    /* Hide desktop header completely (no fixed layer conflict on mobile) */
    .site-header {
        display: none !important;
        position: absolute !important;
        visibility: hidden !important;
        pointer-events: none !important;
        height: 0 !important;
        overflow: hidden !important;
        inset: auto !important;
    }

    .nav-overlay,
    .mobile-drawer {
        z-index: 1100;
    }

    /* Fixed app top bar — must stay pinned while scrolling */
    .app-topbar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-width: 100vw;
        z-index: 1090;
        margin: 0;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: saturate(180%) blur(20px);
        -webkit-backdrop-filter: saturate(180%) blur(20px);
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
        transition: box-shadow 0.3s ease;
        transform: translate3d(0, 0, 0);
        -webkit-transform: translate3d(0, 0, 0);
        backface-visibility: hidden;
        -webkit-backface-visibility: hidden;
        will-change: transform;
        contain: layout style;
        touch-action: manipulation;
    }

    .app-topbar.is-scrolled {
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
    }

    .app-topbar__safe {
        padding-top: calc(var(--safe-top) + var(--app-topbar-top-extra));
        padding-left: var(--app-pad-x);
        padding-right: var(--app-pad-x);
        padding-bottom: 0.5rem;
    }

    .app-topbar__row {
        display: flex;
        align-items: center;
        gap: 0.65rem;
        min-height: 48px;
    }

    .app-topbar__logo {
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        border-radius: 12px;
        overflow: hidden;
        background: transparent;
    }

    .app-topbar__logo .app-topbar__icon {
        width: 42px;
        height: 42px;
        object-fit: contain;
        display: block;
    }

    .app-topbar__search {
        flex: 1;
        display: flex;
        align-items: center;
        gap: 0.65rem;
        min-height: 46px;
        padding: 0 1rem;
        background: #f2f2f7;
        border-radius: 14px;
        border: 1px solid transparent;
        color: var(--text);
        text-decoration: none;
        transition: background 0.2s ease, border-color 0.2s ease;
    }

    .app-topbar__search:active {
        background: #e8e8ed;
        border-color: var(--border);
    }

    .app-topbar__search i {
        color: var(--accent);
        font-size: 1.05rem;
        flex-shrink: 0;
    }

    .app-topbar__search span {
        color: #8e8e93;
        font-size: 0.9375rem;
        font-weight: 500;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .app-topbar__chips {
        display: flex;
        gap: 0.5rem;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding: 0.5rem 0 0.15rem;
        margin: 0 calc(-1 * var(--app-pad-x));
        padding-left: var(--app-pad-x);
        padding-right: var(--app-pad-x);
    }

    .app-topbar__chips::-webkit-scrollbar {
        display: none;
    }

    .app-topbar__chip {
        flex: 0 0 auto;
        scroll-snap-align: start;
        padding: 0.45rem 0.9rem;
        font-size: 0.8125rem;
        font-weight: 600;
        color: var(--text);
        text-decoration: none;
        background: #f2f2f7;
        border-radius: 980px;
        border: 1px solid transparent;
        white-space: nowrap;
        transition: background 0.2s ease, color 0.2s ease;
    }

    .app-topbar__chip.is-active,
    .app-topbar__chip:active {
        background: var(--accent-soft);
        color: var(--accent);
        border-color: rgba(255, 107, 44, 0.2);
    }

    /* Bottom tab bar */
    .app-tabbar {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 1080;
        display: flex;
        align-items: flex-end;
        justify-content: space-around;
        min-height: calc(var(--app-tabbar-h) + var(--safe-bottom));
        padding: 0.35rem var(--app-pad-x) calc(0.5rem + var(--safe-bottom));
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: saturate(180%) blur(24px);
        -webkit-backdrop-filter: saturate(180%) blur(24px);
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.06);
    }

    .app-tabbar__item {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 0.2rem;
        min-height: 52px;
        padding: 0.25rem 0.15rem;
        border: none;
        background: transparent;
        color: #8e8e93;
        font-family: var(--font);
        font-size: 0.625rem;
        font-weight: 600;
        letter-spacing: 0.01em;
        text-decoration: none;
        -webkit-user-select: none;
        user-select: none;
        transition: color 0.2s ease, transform 0.15s ease;
    }

    .app-tabbar__item i {
        font-size: 1.35rem;
        line-height: 1;
        transition: transform 0.2s ease;
    }

    .app-tabbar__item.is-active {
        color: var(--accent);
    }

    .app-tabbar__item.is-active i {
        transform: scale(1.08);
    }

    .app-tabbar__item:not(.app-tabbar__item--cta):active {
        transform: scale(0.92);
    }

    .app-tabbar__item--cta {
        color: var(--text);
    }

    .app-tabbar__item--cta > span:last-child {
        color: var(--text);
    }

    .app-tabbar__fab {
        width: 48px;
        height: 48px;
        margin-top: -22px;
        margin-bottom: 0.15rem;
        display: flex;
        align-items: center;
        justify-content: center;
        flex-shrink: 0;
        background: linear-gradient(145deg, #ff7a45 0%, #ff6b2c 50%, #e85a1f 100%);
        color: #fff;
        border: none;
        border-radius: 16px;
        font-size: 1.25rem;
        line-height: 1;
        overflow: hidden;
        box-shadow: 0 8px 24px rgba(255, 107, 44, 0.45), 0 2px 0 rgba(255, 255, 255, 0.25) inset;
    }

    /* Icon must be white — parent .app-tabbar__item--cta sets dark text color */
    .app-tabbar__fab i {
        color: #fff !important;
        -webkit-text-fill-color: #fff;
        font-size: 1.35rem;
        line-height: 1;
        display: block;
    }

    .app-tabbar__item--cta.is-active .app-tabbar__fab {
        box-shadow: 0 10px 28px rgba(255, 107, 44, 0.55);
    }

    .app-tabbar__item--cta:active .app-tabbar__fab {
        transform: scale(0.96);
    }

    .app-tabbar__item--cta:active .app-tabbar__fab i {
        color: #fff !important;
    }

    /* Bottom sheet drawer */
    .mobile-drawer {
        top: auto;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        max-width: 100%;
        height: auto;
        max-height: min(88vh, 640px);
        border-radius: 24px 24px 0 0;
        padding: 0 1.25rem calc(1.25rem + var(--safe-bottom));
        transform: translateY(100%);
        box-shadow: 0 -20px 60px rgba(0, 0, 0, 0.15);
    }

    .mobile-drawer.is-open {
        transform: translateY(0);
    }

    .mobile-drawer::before {
        content: '';
        display: block;
        width: 40px;
        height: 4px;
        background: #d1d1d6;
        border-radius: 4px;
        margin: 0.75rem auto 1rem;
    }

    .mobile-drawer__head {
        margin-bottom: 0.5rem;
    }

    .mobile-drawer__nav {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.5rem;
    }

    .mobile-drawer__link {
        min-height: 48px;
        padding: 0.75rem 1rem;
        border: none;
        border-radius: 14px;
        background: var(--bg);
        font-size: 0.9375rem;
    }

    .mobile-drawer__link:active {
        background: var(--accent-soft);
        color: var(--accent);
    }

    .mobile-drawer__actions {
        flex-direction: row;
        gap: 0.5rem;
        padding-top: 1rem;
    }

    .mobile-drawer__actions .btn {
        flex: 1;
        min-height: 48px;
    }

    /* Hero — app home screen */
    .hero {
        padding-top: calc(var(--app-topbar-h) + var(--safe-top) + 0.75rem);
        padding-bottom: 1.25rem;
        background: linear-gradient(180deg, #fff 0%, #eef0f3 100%);
        border-radius: 0 0 28px 28px;
        margin-bottom: 0.5rem;
    }

    .hero .container {
        padding-left: var(--app-pad-x);
        padding-right: var(--app-pad-x);
        max-width: 100%;
    }

    .hero__copy {
        text-align: left;
    }

    .hero__title {
        font-size: clamp(1.625rem, 7vw, 2.1rem);
        letter-spacing: -0.04em;
        line-height: 1.1;
        max-width: none;
        margin-bottom: 0.75rem;
    }

    .hero__lead {
        font-size: 0.9375rem;
        line-height: 1.6;
        margin-bottom: 1rem;
    }

    .hero .eyebrow {
        font-size: 0.625rem;
        margin-bottom: 0.5rem;
    }

    .hero__cta {
        display: flex;
        flex-direction: column;
        gap: 0.65rem;
        margin-bottom: 1.25rem;
    }

    .hero__cta .btn {
        width: 100%;
        min-height: 50px;
        font-size: 0.9375rem;
    }

    .hero__cta .btn-nibzo-outline .btn-label-full {
        display: inline;
    }

    .hero__cta .btn-nibzo-outline i {
        display: none;
    }

    .hero__eyebrow-wrap {
        margin-bottom: 0.5rem;
    }

    .hero__stats {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.65rem;
        padding: 0;
        margin-top: 0;
        border: none;
    }

    .hero__stats > div {
        background: #fff;
        border-radius: 16px;
        padding: 0.875rem 0.65rem;
        text-align: center;
        border: 1px solid var(--border);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
    }

    .hero__stats strong {
        font-size: 1.25rem;
        color: var(--accent);
    }

    .hero__stats span {
        font-size: 0.6875rem;
        line-height: 1.3;
        display: block;
        margin-top: 0.15rem;
    }

    .hero__visual {
        margin-top: 1.5rem;
        margin-left: calc(-1 * var(--app-pad-x));
        margin-right: calc(-1 * var(--app-pad-x));
        padding: 0 var(--app-pad-x);
    }

    .hero__gallery {
        max-width: none;
    }

    .hero__card--main {
        border-radius: 24px;
        border: none;
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
    }

    .hero__card--main img {
        aspect-ratio: 16/11;
    }

    .hero__float--2 {
        display: block !important;
        width: 64px;
        height: 64px;
        border: 3px solid #fff;
        border-radius: 16px;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    }

    .hero__ui-card {
        display: flex !important;
        flex-direction: column;
        gap: 0.5rem;
        left: 1rem;
        right: auto;
        top: auto;
        bottom: 1rem;
        padding: 0.75rem 1rem;
        border-radius: 14px;
        max-width: calc(100% - 5rem);
        z-index: 2;
    }

    body.has-app-shell .hero {
        padding-top: calc(var(--app-topbar-h) + var(--safe-top) + 0.75rem) !important;
    }

    /* Sections as app cards */
    .section {
        padding: 2rem 0;
    }

    .section .container {
        padding-left: var(--app-pad-x);
        padding-right: var(--app-pad-x);
    }

    .section-head {
        text-align: left !important;
        margin-bottom: 1.25rem;
    }

    .section-head.text-center .section-head__desc {
        margin-left: 0;
        margin-right: 0;
    }

    .section-head__title {
        font-size: 1.5rem;
    }

    /* Horizontal showcase rail */
    .showcase {
        background: transparent;
        padding-top: 0.5rem;
    }

    .showcase__grid {
        display: flex !important;
        flex-wrap: nowrap !important;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 0.875rem !important;
        margin-left: calc(-1 * var(--app-pad-x));
        margin-right: calc(-1 * var(--app-pad-x));
        padding: 0.25rem var(--app-pad-x) 1rem;
        scrollbar-width: none;
    }

    .showcase__grid::-webkit-scrollbar { display: none; }

    .showcase__grid > [class*="col-"] {
        flex: 0 0 min(78vw, 300px) !important;
        max-width: min(78vw, 300px) !important;
        width: min(78vw, 300px) !important;
        scroll-snap-align: start;
        padding: 0 !important;
    }

    .showcase-card {
        border-radius: 22px;
        border: none;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07);
    }

    .showcase-card__media {
        border-radius: 22px 22px 0 0;
    }

    .showcase-rail-hint {
        display: flex;
        align-items: center;
        gap: 0.35rem;
        font-size: 0.75rem;
        color: var(--text-secondary);
        margin-top: -0.5rem;
        margin-bottom: 1rem;
    }

    .showcase-rail-hint i {
        color: var(--accent);
        animation: swipe-hint 1.5s ease-in-out infinite;
    }

    @keyframes swipe-hint {
        0%, 100% { transform: translateX(0); }
        50% { transform: translateX(4px); }
    }

    /* Features horizontal scroll */
    .features .row {
        display: flex !important;
        flex-wrap: nowrap !important;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        gap: 0.75rem !important;
        margin-left: calc(-1 * var(--app-pad-x));
        margin-right: calc(-1 * var(--app-pad-x));
        padding: 0.25rem var(--app-pad-x) 0.5rem;
        scrollbar-width: none;
    }

    .features .row::-webkit-scrollbar { display: none; }

    .features .row > [class*="col-"] {
        flex: 0 0 72vw !important;
        max-width: 72vw !important;
        scroll-snap-align: start;
        padding: 0 !important;
    }

    .feature-card {
        border-radius: 20px;
        padding: 1.5rem;
        min-height: 200px;
        background: #fff;
        border: none;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    }

    /* Benefits app blocks */
    .benefits {
        background: transparent;
    }

    .benefit-row {
        background: #fff;
        border-radius: 24px;
        padding: 1.25rem;
        margin-bottom: 1rem;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    }

    .benefit-row .row {
        flex-direction: column-reverse;
    }

    .benefits-visual {
        border-radius: 18px;
        margin-bottom: 1rem;
    }

    /* Steps — horizontal */
    .steps__grid {
        display: flex !important;
        flex-wrap: nowrap !important;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        gap: 0.75rem !important;
        margin-left: calc(-1 * var(--app-pad-x));
        margin-right: calc(-1 * var(--app-pad-x));
        padding: 0.25rem var(--app-pad-x);
        scrollbar-width: none;
    }

    .steps__grid::-webkit-scrollbar { display: none; }

    .steps__grid > [class*="col-"] {
        flex: 0 0 80vw !important;
        max-width: 80vw !important;
        scroll-snap-align: start;
        padding: 0 !important;
    }

    .step-card {
        border-radius: 20px;
        border: none;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    }

    /* Early access full bleed card */
    .early-access__panel {
        border-radius: 24px;
        margin: 0;
    }

    /* Social 2x2 grid app tiles */
    .social-grid {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem !important;
    }

    .social-card {
        border-radius: 20px;
        min-height: 100px;
        border: none;
        box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
    }

    /* Contact stacked cards */
    .contact-cards {
        gap: 0.65rem;
    }

    .contact-card {
        border-radius: 18px;
        border: none;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        padding: 1.125rem 1.25rem;
    }

    .contact-card:active {
        transform: scale(0.98);
    }

    /* Footer */
    .site-footer {
        border-radius: 24px 24px 0 0;
        margin-top: 1rem;
    }

    /* Toast above tab bar */
    .toast-nibzo {
        bottom: calc(var(--app-tabbar-h) + var(--safe-bottom) + 1rem);
    }

    .loading-overlay__box {
        padding: 2rem;
        background: rgba(255, 255, 255, 0.1);
        border-radius: 24px;
    }

    /* Touch feedback */
    .btn-nibzo-primary:active,
    .btn-nibzo-outline:active,
    .showcase-card:active {
        transform: scale(0.97);
    }

    .login-cta__panel {
        border-radius: 24px;
        margin: 0 0.25rem;
    }

    /* Global mobile polish */
    .container {
        max-width: 100%;
    }

    .section {
        padding: 2.25rem 0;
    }

    .section:first-of-type {
        padding-top: 0;
    }

    .showcase-card__body {
        padding: 1.125rem 1.25rem 1.35rem;
    }

    .showcase-card__title {
        font-size: 1.0625rem;
    }

    .benefit-row__content h3 {
        font-size: 1.25rem;
    }

    .early-access .container,
    .login-cta .container,
    .site-footer .container {
        padding-left: var(--app-pad-x);
        padding-right: var(--app-pad-x);
    }
}

/* Hide mobile-only elements on desktop */
@media (min-width: 992px) {
    .app-topbar {
        display: none !important;
    }

    .showcase-rail-hint {
        display: none !important;
    }
}

@media (max-width: 991.98px) {
    .showcase-rail-hint {
        display: flex;
    }
}