/* ============================================================
   TMaths Layout – Phases 1, 2, 3
   - Navbar, dropdowns, XP pill, search bar
   - Side nav (desktop) + accordion groups
   - Mobile bottom nav, hamburger header, drawer
   - Floating calculator FAB
   - Preference: data-layout / data-mobile-nav on <html>
   ============================================================ */

/* ─── Base ────────────────────────────────────────────────── */
body {
    background: var(--tm-bg);
    color: var(--tm-text);
    font-family: var(--tm-font-body);
    padding-bottom: 0;
}

    body.tm-no-scroll {
        overflow: hidden;
    }

/* ─── Navbar (desktop top) ────────────────────────────────── */
.tm-navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--tm-surface-elevated);
    border-bottom: 1px solid var(--tm-border);
    box-shadow: var(--tm-shadow-sm);
}

.tm-navbar-inner {
    display: flex;
    align-items: center;
    gap: var(--tm-space-4);
    max-width: var(--tm-content-max);
    margin: 0 auto;
    padding: 0 var(--tm-space-4);
    height: var(--tm-navbar-height);
}

.tm-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
}

    .tm-logo img {
        height: 40px;
        width: auto;
        display: block;
    }

/* ─── Nav links ───────────────────────────────────────────── */
.tm-nav-links {
    display: flex;
    align-items: center;
    gap: var(--tm-space-1);
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1;
    min-width: 0;
}

.tm-nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--tm-space-1);
    padding: var(--tm-space-2) var(--tm-space-3);
    font-size: var(--tm-font-size-sm);
    font-weight: 600;
    color: var(--tm-text-muted);
    text-decoration: none;
    border-radius: var(--tm-radius-md);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--tm-transition-fast), color var(--tm-transition-fast);
    white-space: nowrap;
    font-family: inherit;
}

    .tm-nav-link:hover {
        background: var(--tm-surface-alt);
        color: var(--tm-text);
    }

    .tm-nav-link.tm-active {
        background: var(--tm-primary-subtle);
        color: var(--tm-primary);
    }

/* ─── Dropdowns (top nav) ─────────────────────────────────── */
.tm-nav-dropdown {
    position: relative;
}

.tm-dropdown-toggle::after {
    content: '▾';
    font-size: 0.7em;
    margin-left: 2px;
    transition: transform var(--tm-transition-fast);
}

.tm-nav-dropdown.tm-dropdown-open .tm-dropdown-toggle::after {
    transform: rotate(180deg);
}

.tm-dropdown {
    position: absolute;
    top: calc(100% + var(--tm-space-2));
    left: 0;
    min-width: 220px;
    background: var(--tm-surface-elevated);
    border: 1px solid var(--tm-border);
    border-radius: var(--tm-radius-md);
    box-shadow: var(--tm-shadow-md);
    padding: var(--tm-space-2);
    list-style: none;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--tm-transition-fast), transform var(--tm-transition-fast), visibility var(--tm-transition-fast);
    z-index: 100;
}

.tm-nav-dropdown.tm-dropdown-open .tm-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.tm-dropdown-item {
    display: block;
    padding: var(--tm-space-2) var(--tm-space-3);
    font-size: var(--tm-font-size-sm);
    color: var(--tm-text);
    text-decoration: none;
    border-radius: var(--tm-radius-sm);
    transition: background var(--tm-transition-fast);
    white-space: nowrap;
}

    .tm-dropdown-item:hover {
        background: var(--tm-surface-alt);
        color: var(--tm-text);
    }

    .tm-dropdown-item.tm-active {
        background: var(--tm-primary-subtle);
        color: var(--tm-primary);
        font-weight: 600;
    }

.tm-dropdown-divider {
    height: 1px;
    background: var(--tm-border);
    margin: var(--tm-space-2) 0;
}

/* ─── Navbar actions ──────────────────────────────────────── */
.tm-navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--tm-space-2);
    flex-shrink: 0;
}

.tm-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--tm-radius-md);
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--tm-text-muted);
    font-size: 1.1rem;
    transition: background var(--tm-transition-fast), color var(--tm-transition-fast);
}

    .tm-icon-btn:hover {
        background: var(--tm-surface-alt);
        color: var(--tm-text);
    }

/* ─── Shared search bar ───────────────────────────────────── */
.tm-search-bar {
    position: fixed;
    top: var(--tm-navbar-height);
    left: 0;
    right: 0;
    z-index: 998;
    padding: var(--tm-space-3) var(--tm-space-4);
    background: var(--tm-surface);
    border-bottom: 1px solid var(--tm-border);
    box-shadow: var(--tm-shadow-sm);
}

    .tm-search-bar[hidden] {
        display: none;
    }

@media (min-width: 769px) {
    :root[data-layout="side"] .tm-search-bar {
        left: 0;
        right: auto;
        top: 60px; /* sits below the sidenav header/logo */
        width: 260px;
        border-radius: 0;
        border-top: none;
    }
}

@media (max-width: 768px) {
    :root[data-mobile-nav="bottom"] .tm-search-bar {
        top: 0 !important;
    }
}

/* ─── XP pill ─────────────────────────────────────────────── */
.tm-xp-wrapper {
    position: relative;
}

.tm-xp-pill {
    display: inline-flex;
    align-items: center;
    gap: var(--tm-space-2);
    padding: var(--tm-space-2) var(--tm-space-3);
    background: var(--tm-surface-alt);
    border: 1px solid var(--tm-border);
    border-radius: var(--tm-radius-pill);
    cursor: pointer;
    font-size: var(--tm-font-size-sm);
    font-weight: 600;
    color: var(--tm-text);
    transition: background var(--tm-transition-fast), border-color var(--tm-transition-fast);
    font-family: inherit;
}

    .tm-xp-pill:hover {
        background: var(--tm-surface);
        border-color: var(--tm-border-strong);
    }

.tm-xp-icon {
    font-size: 1rem;
    line-height: 1;
}

.tm-xp-level {
    font-size: var(--tm-font-size-sm);
    font-weight: 700;
}

/* ─── XP dropdown ─────────────────────────────────────────── */
.tm-xp-dropdown {
    position: absolute;
    top: calc(100% + var(--tm-space-2));
    right: 0;
    min-width: 280px;
    background: var(--tm-surface-elevated);
    border: 1px solid var(--tm-border);
    border-radius: var(--tm-radius-md);
    box-shadow: var(--tm-shadow-md);
    padding: var(--tm-space-4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity var(--tm-transition-fast), transform var(--tm-transition-fast), visibility var(--tm-transition-fast);
    z-index: 100;
    text-align: left;
}

.tm-xp-wrapper.tm-dropdown-open .tm-xp-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.tm-xp-dropdown .tm-xp-header {
    margin-bottom: var(--tm-space-3);
}

.tm-xp-dropdown .tm-xp-level-title {
    font-weight: 700;
    font-size: var(--tm-font-size-base);
    color: var(--tm-text);
    margin-bottom: var(--tm-space-2);
}

.tm-xp-dropdown .tm-xp-progress-bar {
    height: 8px;
    background: var(--tm-surface-alt);
    border-radius: var(--tm-radius-pill);
    overflow: hidden;
    margin-bottom: var(--tm-space-2);
}

.tm-xp-dropdown .tm-xp-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--tm-primary), var(--tm-accent));
    border-radius: var(--tm-radius-pill);
    transition: width var(--tm-transition-base);
}

.tm-xp-dropdown .tm-xp-numbers {
    display: flex;
    justify-content: space-between;
    font-size: var(--tm-font-size-xs);
    color: var(--tm-text-muted);
}

.tm-xp-dropdown .tm-xp-remaining {
    font-size: var(--tm-font-size-xs);
    color: var(--tm-text-subtle);
    margin-top: var(--tm-space-1);
    display: block;
}

.tm-xp-dropdown .tm-xp-stats {
    display: flex;
    gap: var(--tm-space-4);
    padding-top: var(--tm-space-3);
    border-top: 1px solid var(--tm-border);
    margin-top: var(--tm-space-3);
}

.tm-xp-stat {
    display: flex;
    align-items: center;
    gap: var(--tm-space-1);
    font-size: var(--tm-font-size-sm);
    color: var(--tm-text-muted);
}

    .tm-xp-stat strong {
        color: var(--tm-text);
        font-weight: 700;
    }

.tm-xp-dropdown .tm-xp-view-badges {
    display: block;
    width: 100%;
    margin-top: var(--tm-space-3);
    padding: var(--tm-space-2);
    background: var(--tm-primary);
    color: var(--tm-text-inverse);
    border: none;
    border-radius: var(--tm-radius-sm);
    font-size: var(--tm-font-size-sm);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--tm-transition-fast);
}

    .tm-xp-dropdown .tm-xp-view-badges:hover {
        background: var(--tm-primary-hover);
    }

/* ─── Main content ────────────────────────────────────────── */
/*.tm-main {
    min-height: calc(100vh - var(--tm-navbar-height));
}*/

/* ═══════════════════════════════════════════════════════════
   SIDE NAV (desktop)
   =========================================================== */
.tm-sidenav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 260px;
    background: var(--tm-surface-elevated);
    border-right: 1px solid var(--tm-border);
    flex-direction: column;
    z-index: 1000;
    transition: transform var(--tm-transition-base);
}

:root[data-layout="side"] .tm-sidenav {
    display: flex;
}

:root[data-layout="side"] .tm-navbar {
    display: none;
}

:root[data-layout="side"] .tm-main {
    margin-left: 260px;
}

.tm-sidenav-header {
    display: flex;
    align-items: center;
    padding: var(--tm-space-4);
    border-bottom: 1px solid var(--tm-border);
    flex-shrink: 0;
}

    .tm-sidenav-header .tm-logo img {
        height: 36px;
    }

.tm-sidenav-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--tm-space-3) var(--tm-space-2);
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.tm-sidenav-link,
.tm-sidenav-group-toggle {
    display: flex;
    align-items: center;
    gap: var(--tm-space-3);
    width: 100%;
    padding: var(--tm-space-2) var(--tm-space-3);
    background: transparent;
    border: none;
    color: var(--tm-text-muted);
    font-family: inherit;
    font-size: var(--tm-font-size-sm);
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--tm-radius-md);
    cursor: pointer;
    transition: background var(--tm-transition-fast), color var(--tm-transition-fast);
    text-align: left;
}

    .tm-sidenav-link:hover,
    .tm-sidenav-group-toggle:hover {
        background: var(--tm-surface-alt);
        color: var(--tm-text);
    }

    .tm-sidenav-link.tm-active {
        background: var(--tm-primary-subtle);
        color: var(--tm-primary);
    }

.tm-sidenav-icon {
    width: 20px;
    text-align: center;
    font-size: 1.05rem;
}

.tm-sidenav-chevron {
    margin-left: auto;
    font-size: 0.7em;
    transition: transform var(--tm-transition-fast);
    color: var(--tm-text-subtle);
}

.tm-sidenav-group.tm-open > .tm-sidenav-group-toggle .tm-sidenav-chevron {
    transform: rotate(90deg);
}

.tm-sidenav-group.tm-open > .tm-sidenav-group-toggle {
    color: var(--tm-text);
}

.tm-sidenav-submenu {
    display: none;
    padding-left: var(--tm-space-6);
    margin-top: var(--tm-space-1);
    margin-bottom: var(--tm-space-1);
    flex-direction: column;
    gap: 1px;
}

.tm-sidenav-group.tm-open > .tm-sidenav-submenu {
    display: flex;
}

.tm-sidenav-sublink {
    display: block;
    padding: var(--tm-space-2) var(--tm-space-3);
    font-size: var(--tm-font-size-sm);
    color: var(--tm-text-muted);
    text-decoration: none;
    border-radius: var(--tm-radius-sm);
    transition: background var(--tm-transition-fast), color var(--tm-transition-fast);
}

    .tm-sidenav-sublink:hover {
        background: var(--tm-surface-alt);
        color: var(--tm-text);
    }

    .tm-sidenav-sublink.tm-active {
        background: var(--tm-primary-subtle);
        color: var(--tm-primary);
        font-weight: 600;
    }

.tm-sidenav-footer {
    display: flex;
    align-items: center;
    gap: var(--tm-space-2);
    padding: var(--tm-space-3) var(--tm-space-4);
    border-top: 1px solid var(--tm-border);
    flex-shrink: 0;
}

    .tm-sidenav-footer .tm-xp-wrapper {
        margin-left: auto;
    }

/* ═══════════════════════════════════════════════════════════
   MOBILE HEADER (hamburger trigger)
   =========================================================== */
.tm-mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--tm-navbar-height);
    background: var(--tm-surface-elevated);
    border-bottom: 1px solid var(--tm-border);
    z-index: 999;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--tm-space-3);
    box-shadow: var(--tm-shadow-sm);
}

    .tm-mobile-header .tm-logo-small img {
        height: 32px;
    }

/* ═══════════════════════════════════════════════════════════
   MOBILE DRAWER (hamburger content)
   =========================================================== */
.tm-drawer-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--tm-overlay);
    z-index: 1001;
    opacity: 0;
    transition: opacity var(--tm-transition-base);
}

    .tm-drawer-backdrop.tm-open {
        display: block;
        opacity: 1;
    }

.tm-mobile-drawer {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    background: var(--tm-surface-elevated);
    border-right: 1px solid var(--tm-border);
    z-index: 1002;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform var(--tm-transition-base);
    overflow: hidden;
}

    .tm-mobile-drawer.tm-open {
        transform: translateX(0);
    }

    .tm-mobile-drawer .tm-sidenav-nav {
        flex: 1;
        overflow-y: auto;
    }

    .tm-mobile-drawer .tm-sidenav-footer {
        padding-bottom: calc(var(--tm-space-4) + env(safe-area-inset-bottom, 0));
    }

/* ═══════════════════════════════════════════════════════════
   MOBILE DRAWER - STACKING GUARD
   The lesson Overview (details#lesson-overview) and its first-time
   hint sit in normal page flow inside .tm-main. On narrow screens
   that section can paint over the fixed drawer, so the drawer and
   its backdrop are pinned above all page content here. The floating
   tools stay on top (9998+), which is intended.
   =========================================================== */
@media (max-width: 768px) {
    .tm-drawer-backdrop {
        z-index: 1099;
    }

    .tm-mobile-drawer {
        z-index: 1100;
    }
}

/* ═══════════════════════════════════════════════════════════
   BOTTOM NAV (mobile – bottom mode)
   =========================================================== */
.tm-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--tm-bottom-nav-height);
    background: var(--tm-surface-elevated);
    border-top: 1px solid var(--tm-border);
    z-index: 1000;
    box-shadow: 0 -2px 8px rgba(15, 23, 42, 0.06);
}

.tm-bottom-nav-inner {
    display: flex;
    align-items: stretch;
    height: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.tm-bottom-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    text-decoration: none;
    color: var(--tm-text-muted);
    font-size: 0.7rem;
    font-weight: 600;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: inherit;
    padding: var(--tm-space-1);
    transition: color var(--tm-transition-fast);
}

    .tm-bottom-tab .tm-tab-icon {
        font-size: 1.35rem;
        line-height: 1;
    }

    .tm-bottom-tab.tm-active {
        color: var(--tm-primary);
    }

    .tm-bottom-tab:active {
        background: var(--tm-surface-alt);
    }

/* ═══════════════════════════════════════════════════════════
   MOBILE BOTTOM SHEETS (bottom nav tabs)
   =========================================================== */
.tm-sheet-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--tm-overlay);
    z-index: 1001;
    opacity: 0;
    transition: opacity var(--tm-transition-base);
}

    .tm-sheet-backdrop.tm-sheet-open {
        display: block;
        opacity: 1;
    }

.tm-sheet {
    display: none;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--tm-surface-elevated);
    border-radius: var(--tm-radius-lg) var(--tm-radius-lg) 0 0;
    box-shadow: 0 -4px 24px rgba(15, 23, 42, 0.15);
    z-index: 1002;
    max-height: 80vh;
    overflow-y: auto;
    transform: translateY(100%);
    transition: transform var(--tm-transition-base);
    padding-bottom: var(--tm-space-6);
}

    .tm-sheet.tm-sheet-open {
        display: block;
        transform: translateY(0);
    }

.tm-sheet-handle {
    width: 40px;
    height: 4px;
    background: var(--tm-border-strong);
    border-radius: var(--tm-radius-pill);
    margin: var(--tm-space-3) auto;
}

.tm-sheet-title {
    font-size: var(--tm-font-size-lg);
    font-weight: 700;
    padding: 0 var(--tm-space-4) var(--tm-space-3);
    color: var(--tm-text);
    margin: 0;
}

.tm-sheet-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.tm-sheet-item {
    display: flex;
    align-items: center;
    gap: var(--tm-space-3);
    padding: var(--tm-space-3) var(--tm-space-4);
    color: var(--tm-text);
    text-decoration: none;
    font-size: var(--tm-font-size-base);
    border: none;
    background: transparent;
    width: 100%;
    text-align: left;
    cursor: pointer;
    font-family: inherit;
    transition: background var(--tm-transition-fast);
}

    .tm-sheet-item:hover,
    .tm-sheet-item:active {
        background: var(--tm-surface-alt);
    }

    .tm-sheet-item .tm-sheet-icon {
        font-size: 1.2rem;
        width: 24px;
        text-align: center;
    }

/* ═══════════════════════════════════════════════════════════
   SEARCH BAR position – depends on layout
   =========================================================== */
:root[data-layout="side"] .tm-search-bar {
    left: 260px;
    top: 0;
}

/* ═══════════════════════════════════════════════════════════
   THEME PICKER + MODE PICKER (Preferences page)
   =========================================================== */
.theme-picker {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--tm-space-3);
}

.theme-swatch {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--tm-space-2);
    padding: var(--tm-space-3);
    background: var(--tm-surface);
    border: 2px solid var(--tm-border);
    border-radius: var(--tm-radius-md);
    cursor: pointer;
    font-family: inherit;
    color: var(--tm-text);
    transition: border-color var(--tm-transition-fast), transform var(--tm-transition-fast);
}

    .theme-swatch:hover {
        transform: translateY(-2px);
        border-color: var(--tm-border-strong);
    }

    .theme-swatch.selected {
        border-color: var(--tm-primary);
        box-shadow: 0 0 0 3px var(--tm-primary-subtle);
    }

.theme-swatch-preview {
    width: 100%;
    height: 44px;
    border-radius: var(--tm-radius-sm);
}

.theme-swatch-name {
    font-size: var(--tm-font-size-sm);
    font-weight: 600;
}

.mode-picker {
    display: flex;
    gap: var(--tm-space-2);
    flex-wrap: wrap;
}

.mode-option {
    display: flex;
    align-items: center;
    gap: var(--tm-space-2);
    padding: var(--tm-space-2) var(--tm-space-4);
    background: var(--tm-surface);
    border: 2px solid var(--tm-border);
    border-radius: var(--tm-radius-md);
    cursor: pointer;
    font-size: var(--tm-font-size-sm);
    transition: border-color var(--tm-transition-fast), background var(--tm-transition-fast), color var(--tm-transition-fast);
}

    .mode-option:hover {
        border-color: var(--tm-border-strong);
    }

    .mode-option.selected {
        border-color: var(--tm-primary);
        background: var(--tm-primary-subtle);
        color: var(--tm-primary);
        font-weight: 600;
    }

    .mode-option input[type="radio"] {
        display: none;
    }

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   =========================================================== */

/* Desktop – side nav and top nav rules */
@media (min-width: 769px) {
    .tm-bottom-nav {
        display: none !important;
    }

    .tm-mobile-header {
        display: none !important;
    }

    .tm-mobile-drawer {
        display: none !important;
    }

    .tm-drawer-backdrop {
        display: none !important;
    }
}

/* Mobile – hide desktop nav, apply mobile modes */
@media (max-width: 768px) {
    /* Always hide desktop nav on mobile */
    .tm-navbar {
        display: none !important;
    }

    .tm-sidenav {
        display: none !important;
    }

    :root[data-layout="side"] .tm-main {
        margin-left: 0 !important;
    }

    :root[data-layout="side"] .tm-search-bar {
        left: 0;
    }

    /* Main padding-bottom for bottom nav (default) */
    .tm-main {
        padding-bottom: calc(var(--tm-bottom-nav-height) + var(--tm-space-4));
        min-height: calc(100vh - var(--tm-bottom-nav-height));
    }

    /* Mobile bottom nav — visible by default */
    .tm-bottom-nav {
        display: block;
        z-index: 100;
    }

    /* Hamburger mode overrides */
    :root[data-mobile-nav="hamburger"] .tm-mobile-header {
        display: flex;
    }

    :root[data-mobile-nav="hamburger"] .tm-main {
        padding-top: calc(var(--tm-navbar-height) + var(--tm-space-4));
        padding-bottom: var(--tm-space-4);
        min-height: 100vh;
    }

    :root[data-mobile-nav="hamburger"] .tm-bottom-nav {
        display: none !important;
    }

    :root[data-mobile-nav="hamburger"] .tm-search-bar {
        top: var(--tm-navbar-height);
    }

    body:has(#score-board) .tm-bottom-nav {
        padding-bottom: var(--tm-bottom-nav-height); /* or 70px / whatever the score board height is */
    }

    :root[data-mobile-nav="bottom"] #floating-toggle {
        display: none !important;
    }

    :root[data-mobile-nav="hamburger"] body:has(#score-board) #floating-toggle {
        bottom: calc( var(--tm-fab-gap) + var(--tm-scoreboard-height) + env(safe-area-inset-bottom, 0px) ) !important;
    }

    :root[data-mobile-nav="hamburger"] body:has(#score-board) #floating-panel {
        bottom: calc( var(--tm-fab-gap) + var(--tm-scoreboard-height) + env(safe-area-inset-bottom, 0px) + var(--tm-fab-size) + var(--tm-space-2) /* small gap between FAB and panel */
        ) !important;
    }
}

/* ═══════════════════════════════════════════════════════════
   UTILITY
   =========================================================== */
.tm-hidden {
    display: none !important;
}

/* ─── Floating tools above bottom nav on mobile ──────────── */
@media (max-width: 768px) {
    /* Bottom nav mode – lift floating tools above the bottom nav */
    :root[data-mobile-nav="bottom"] #floating-toggle,
    :root[data-mobile-nav="bottom"] #floating-panel {
        bottom: calc(var(--tm-bottom-nav-height) + var(--tm-space-3)) !important;
    }

    /* Hamburger mode – no bottom nav, keep normal position but add safe area */
    :root[data-mobile-nav="hamburger"] #floating-toggle,
    :root[data-mobile-nav="hamburger"] #floating-panel {
        bottom: calc(var(--tm-space-4) + env(safe-area-inset-bottom, 0)) !important;
    }
}

/* ═══════════════════════════════════════════════════════════
   MathLive input – make it usable
   =========================================================== */
math-field {
    display: block;
    width: 100%;
    min-width: 200px;
    min-height: 48px;
    padding: 10px 14px;
    font-size: 1.1rem;
    font-family: var(--tm-font-mono);
    color: var(--tm-text);
    background: var(--tm-surface-elevated);
    border: 2px solid var(--tm-border);
    border-radius: var(--tm-radius-md);
    box-sizing: border-box;
    outline: none;
    transition: border-color var(--tm-transition-fast), box-shadow var(--tm-transition-fast);
}

    math-field:focus,
    math-field:focus-within {
        border-color: var(--tm-primary);
        box-shadow: 0 0 0 3px var(--tm-primary-subtle);
    }

    /* Ensure the inner container doesn't collapse */
    math-field::part(container) {
        padding: 0;
    }

/* Larger tap target on mobile */
@media (max-width: 768px) {
    math-field {
        min-height: 56px;
        font-size: 1.2rem;
        padding: 12px 16px;
    }
}

/* Fallback: any raw math-field with inline style still gets this treatment */
.math-field-container math-field,
.challenge-board math-field {
    display: block;
    width: 100%;
    max-width: 600px;
}

/* ═══════════════════════════════════════════════════════════
   MathLive virtual keyboard – ensure it's on top
   =========================================================== */
/*.ML__keyboard {
    z-index: 2000 !important;
}*/

/* Ensure the keyboard fits above the bottom nav on mobile */
/*@media (max-width: 768px) {
    :root[data-mobile-nav="bottom"] .ML__keyboard.is-visible {
        bottom: var(--tm-bottom-nav-height) !important;
        padding-bottom: env(safe-area-inset-bottom, 0);
    }*/

    /* Hamburger mode – keyboard sits at the very bottom */
    /*:root[data-mobile-nav="hamburger"] .ML__keyboard.is-visible {
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
}*/

/* iPad / tablet – make sure keyboard has room */
/*@media (min-width: 600px) and (max-width: 1024px) {
    .ML__keyboard.is-visible {
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
}*/

/* ═══════════════════════════════════════════════════════════
   MathLive virtual keyboard – force visible on all devices
   =========================================================== */
/*.ML__keyboard.is-visible {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
    position: fixed !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    top: auto !important;
    width: 100% !important;
    max-width: 100vw !important;
    transform: none !important;
    z-index: 99999 !important;
}

.ML__keyboard {
    z-index: 99999 !important;
}
*/


    /* iOS only */
    /*body > .ML__keyboard.is-visible {
        position: fixed !important;
        top: auto !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        height: auto !important;
    }

        body > .ML__keyboard.is-visible > .MLK__backdrop {
            position: relative !important;
            bottom: auto !important;
            height: auto !important;
            transform: none !important;
            opacity: 1 !important;
            visibility: visible !important;
        }

        body > .ML__keyboard.is-visible .MLK__plate {
            position: static !important;
        }*/

body > .ML__keyboard  {
    z-index: 9999 !important;
}

/*#tm-kb-wrapper .MLK__backdrop {
    position: relative !important;
    bottom: 0 !important;
    top: auto !important;
    height: auto !important;*/
    /*transform: none !important;*/
    /*opacity: 1 !important;
    visibility: visible !important;
}

#tm-kb-wrapper .MLK__plate {
    position: static !important;
}*/

/* Optional: undo the keyboard's own 100% height */
/*#tm-kb-wrapper .ML__keyboard {
    height: auto !important;
}

#tm-kb-wrapper .ML__keyboard {
    height: auto !important;
    overflow: visible !important;
    --_keyboard-height: 0 !important;
    position: relative !important;
}*/

/* ═══════════════════════════════════════════════════════════
   Bottom nav — badge on the Tools tab
   ═══════════════════════════════════════════════════════════ */

.tm-bottom-tab .tm-tab-icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.tm-tab-badge {
    position: absolute;
    top: -4px;
    right: -8px;
    min-width: 16px;
    height: 16px;
    padding: 0 4px;
    background: var(--tm-danger, #dc2626);
    color: #fff;
    font-size: 0.6rem;
    font-weight: 700;
    line-height: 16px;
    text-align: center;
    border-radius: 999px;
    box-shadow: 0 0 0 2px var(--tm-surface-elevated, #fff);
    pointer-events: none;
}