/* =================================================================
   Anchor Us Design System -- responsive.css

   Breakpoints + non-screen media features. Loaded last so consumer
   overrides in css/app.css can land later in the cascade if needed.

   Breakpoints:
     768px -- tablet to phone hand-off; sidebar collapses to drawer
     600px -- small-phone density: form/list reflow, popovers go full
     480px -- narrow-phone: auth padding, modal margin

   Non-screen media:
     display-mode: standalone   -- iOS PWA safe-area-inset
     prefers-reduced-motion     -- disable transitions/animations
     hover: none                -- touch device fallbacks
   ================================================================= */


/* =================================================================
   Bottom tab bar -- consumer-rendered <nav class="bottom-tabs"> with
   <a class="tab-item">/<button class="tab-item"> children carrying
   .tab-icon + .tab-label. Hidden by default; activated on the 768px
   breakpoint below. Consumers set --tab-bar-h on :root to opt in
   (the .content padding-bottom and .install-banner offset rules
   below already read --tab-bar-h, defaulting to 0px).
   ================================================================= */
.bottom-tabs { display: none; }


/* =================================================================
   <= 768px: tablet boundary -- shell collapses
   ================================================================= */
@media (max-width: 768px) {
    /* App shell becomes single-column; sidebar slides in/out as
       off-canvas drawer. */
    .app-shell {
        grid-template-columns: minmax(0, 1fr);
        grid-template-rows: var(--topbar-h) 1fr;
        grid-template-areas:
            "topbar"
            "content";
    }

    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        width: 280px;
        height: 100vh;
        transition: left .25s var(--ease);
        z-index: 200;
    }
    .sidebar.open { left: 0; }
    .sidebar-close { display: block; }

    /* Hamburger lives in the topbar's left slot on mobile. */
    .menu-toggle { display: inline-flex; }

    /* Tighter content padding on small screens. */
    .content {
        padding: 1rem;
        /* Bottom-pad clears any consumer-rendered bottom tab bar
           (var(--tab-bar-h) defaults to 0). */
        padding-bottom: calc(1rem + var(--tab-bar-h, 0px));
    }

    .topbar { padding: 0 1rem; }

    /* Promote the topbar title to a real page header on mobile -- 1rem
       sage reads as a toolbar label on a touch viewport, so step up to
       the .page-title size and let it anchor the view. Width is
       bounded with ellipsis so a long route name can't push the
       right-side controls off-screen. */
    .topbar-title {
        font-size: 22px;
        line-height: 30px;
        color: var(--ink);
        max-width: calc(100vw - 140px);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .user-name { display: none; }

    /* Form 2-up rows stack on mobile. */
    .form-group-2col { grid-template-columns: 1fr; }

    /* Definition list stacks key/value vertically. */
    .def-list,
    .def-list-compact { grid-template-columns: 1fr; }
    .def-list dt { margin-bottom: 2px; }

    /* Install banner: full-width, lifted above any bottom tab bar. */
    .install-banner {
        right: 8px;
        left: 8px;
        width: auto;
        max-width: none;
        bottom: calc(var(--tab-bar-h, 0px) + 8px);
        padding: .8rem .9rem;
    }
    .install-banner-body { gap: .6rem; }
    .install-banner-icon { width: 36px; height: 36px; }
    .install-banner-title { font-size: .9rem; }

    /* Bottom tab bar activates on the tablet boundary. Fixed to the
       viewport bottom, sized by --tab-bar-h, with iOS safe-area
       padding so the home indicator doesn't overlap the row. */
    .bottom-tabs {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        height: var(--tab-bar-h);
        background: var(--paper);
        border-top: 0.5px solid var(--divider);
        z-index: 150;
        justify-content: space-around;
        align-items: center;
        padding: 0 .25rem;
        padding-bottom: env(safe-area-inset-bottom, 0px);
    }

    .tab-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        flex: 1;
        gap: .15rem;
        padding: .35rem 0;
        color: var(--ink-muted);
        font-size: .6rem;
        text-decoration: none;
        transition: color .12s var(--ease);
        cursor: pointer;
        background: none;
        border: none;
        font-family: inherit;
    }
    .tab-item:hover { color: var(--ink); }
    .tab-item.active { color: var(--sage-500); }
    .tab-icon { width: 22px; height: 22px; flex-shrink: 0; }
    .tab-item.active .tab-icon { opacity: 1; }
    .tab-label { letter-spacing: .02em; }
}


/* =================================================================
   <= 600px: small-phone density
   ================================================================= */
@media (max-width: 600px) {
    /* Modals lose all margin. */
    .modal {
        max-width: 100%;
        margin: 0 .5rem;
        border-radius: var(--radius);
    }

    /* Popovers go full width minus gutters so column-header filters
       stay tappable on phones. */
    .txn-filter-popover {
        position: fixed;
        left: 8px;
        right: 8px;
        max-width: none;
        min-width: 0;
        top: auto;
    }
}


/* =================================================================
   <= 480px: narrow-phone
   ================================================================= */
@media (max-width: 480px) {
    .auth-card {
        padding: 1.75rem;
    }

    .settings-tab {
        font-size: .65rem;
        padding: .4rem .25rem;
    }

    .settings-panel .flex.gap-sm { flex-wrap: wrap; }
    .settings-panel .btn-sm { flex: 1 1 auto; min-width: 0; }
}


/* =================================================================
   PWA standalone mode (iOS notch + home indicator safe areas)
   ================================================================= */
@media (display-mode: standalone) {
    .topbar {
        padding-top: env(safe-area-inset-top, 0);
    }
    .sidebar {
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
}


/* =================================================================
   Reduced motion -- BRAND_V2.md §11 accessibility commitment.
   Disable all custom animations and transitions when the user has
   asked the OS to dial down motion.
   ================================================================= */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}


/* =================================================================
   Touch devices -- :hover doesn't fire predictably, so keep
   hover-revealed UI permanently visible at low opacity on touch.
   ================================================================= */
@media (hover: none) {
    .notif-item-delete { opacity: .6; }
    .notif-item-delete:active { opacity: 1; }
}