/* ==========================================================================
   responsive.css — mobile / tablet overrides for PhysicsCraft
   Loaded AFTER style.css. Targets existing class names so templates stay
   mostly untouched. Breakpoints: tablet <=1024px, phone <=768px, small <=480px.
   ========================================================================== */

/* --- Hamburger toggle button (hidden on desktop) --- */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    line-height: 1;
    border-radius: 8px;
}

.nav-toggle:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* ==========================================================================
   TABLET  (<=1024px)
   ========================================================================== */
@media (max-width: 1024px) {
    .header-container {
        padding: 0.75rem 1rem;
    }

    .container {
        padding: 0 1rem;
    }

    .nav-menu {
        gap: 1rem;
    }
}

/* ==========================================================================
   PHONE  (<=768px)
   ========================================================================== */
@media (max-width: 768px) {

    /* ---- Global guards ---- */
    html,
    body {
        overflow-x: hidden;
    }

    .container {
        max-width: 100%;
        margin-top: 1rem;
        padding: 0 0.85rem;
    }

    .page-card {
        padding: 1.1rem;
        border-radius: 14px;
    }

    /* ---- Mobile density: cap oversized radii on common card surfaces so
       they don't read as chunky on a small screen (padding is tightened per
       page where those cards carry inline styles) ---- */
    .card,
    .quiz-card,
    .analytics-card,
    .recent-perf-group,
    .q-card,
    .summary-header {
        border-radius: 14px;
    }

    /* Comfortable tap targets */
    .btn,
    button,
    .nav-link,
    input[type="submit"],
    select {
        min-height: 44px;
    }

    /* Never let media/tables blow out the viewport */
    img,
    table {
        max-width: 100%;
    }

    /* ---- Hamburger navigation ---- */
    .header-container {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .nav-menu {
        display: none;
        order: 3;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding-top: 0.5rem;
        border-top: 1px solid var(--border);
        margin-top: 0.5rem;
    }

    .nav-menu.open {
        display: flex;
    }

    .nav-menu .nav-link {
        display: block;
        padding: 0.75rem 0.5rem;
        border-radius: 8px;
    }

    .nav-menu .nav-link:hover {
        background: rgba(37, 99, 235, 0.06);
    }

    .nav-menu .welcome-user {
        padding: 0.5rem;
    }

    .nav-menu form,
    .nav-menu .btn {
        width: 100%;
    }

    .nav-menu form .btn {
        width: 100%;
    }

    /* ==================================================================
       TEST-TAKING FLOW
       ================================================================== */

    /* Avoid two stacked sticky bars eating the screen */
    .quiz-header-sticky {
        padding: 0.6rem 0;
        margin-bottom: 1.25rem;
    }

    .quiz-header-content {
        flex-wrap: wrap;
        gap: 0.5rem;
        padding: 0 1rem;
    }

    .quiz-header-content h2 {
        font-size: 1.05rem !important;
    }

    .timer-badge {
        font-size: 0.85rem;
        padding: 0.4rem 0.8rem;
    }

    .quiz-container {
        padding: 0 0.25rem 90px;
    }

    .question-card,
    .passage-card {
        padding: 1rem;
        margin-bottom: 1.25rem;
    }

    .question-header {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .q-text {
        font-size: 1.05rem;
    }

    .option-label {
        padding: 0.85rem;
    }

    /* MATRIX_3_COL passage: stack the three columns */
    .matrix-3col-grid {
        grid-template-columns: 1fr !important;
    }

    /* Matrix match (Column I / Column II): stack + tighten the huge gap */
    .matrix-2col-grid {
        grid-template-columns: 1fr !important;
        gap: 1.5rem !important;
    }

    .matrix-display-modern {
        padding: 1.25rem !important;
    }

    /* Matrix selection grid keeps its shape but can scroll if needed */
    .matrix-select-grid {
        overflow-x: auto;
    }

    /* Full-width submit button in the fixed footer */
    .fixed-footer {
        padding: 0.75rem 1rem;
    }

    .fixed-footer .btn {
        min-width: 0;
        width: 100%;
    }

    /* ==================================================================
       RESULT PAGE
       ================================================================== */

    /* Collapse multi-column stat/summary grids to a single column.
       Covers inline `display:grid` blocks tagged with these helper classes. */
    .result-stats-grid,
    .stats-grid,
    .summary-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 480px) {

    .result-stats-grid,
    .stats-grid,
    .summary-grid {
        grid-template-columns: 1fr !important;
    }
}

/* ==========================================================================
   Horizontal-scroll wrapper for any wide table (matrix tables etc.)
   Applied via a .table-scroll wrapper in templates. Works at all widths.
   ========================================================================== */
.table-scroll {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ==========================================================================
   SMALL PHONE  (<=480px)
   ========================================================================== */
@media (max-width: 480px) {
    .logo-text {
        font-size: 1.2rem;
    }

    .page-card {
        padding: 1rem;
    }

    .q-text {
        font-size: 1rem;
    }

    .marking-scheme {
        flex-wrap: wrap;
    }
}