/* ═══════════════════════════════════════════════════════════════════
   mobile.css — CSCAce · Mobile-first responsive additions
   Complements style.css — import AFTER it.
   ═══════════════════════════════════════════════════════════════════ */

/* ─── KaTeX global overrides ──────────────────────────────────────── */
.katex           { font-size: 1em !important; }
.katex-display   { overflow-x: auto; overflow-y: hidden; padding: 0.25rem 0; }
.katex-error     { color: var(--red); font-family: var(--font-mono); font-size: 0.8em; }
/* Ensure block math doesn't overflow card on mobile */
.q-text .katex-display  { max-width: 100%; }
.q-option .katex        { font-size: 0.9em !important; }
.fc-def .katex-display  { margin: 0.5rem 0; }

/* ─── Nav mobile ──────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-inner { height: auto; min-height: 54px; flex-wrap: wrap; padding: 0.5rem 1rem; gap: 0.5rem; }
  .nav-links { display: none; }          /* hidden on mobile */
  .logo-text { font-size: 0.95rem; }
  .btn-nav   { font-size: 0.78rem; padding: 0.4rem 0.75rem; }
}

/* ─── Hero ─────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero                  { grid-template-columns: 1fr; padding: 3rem 1.25rem 2.5rem; gap: 2.5rem; }
  .hero-card             { display: none; }
  .hero h1               { font-size: clamp(2rem, 7vw, 3rem); }
  .hero-actions          { flex-direction: column; }
  .hero-actions .btn     { width: 100%; justify-content: center; }
}

@media (max-width: 480px) {
  .hero-trust            { gap: 1rem; }
  .trust-sep             { display: none; }
  .trust-n               { font-size: 1.1rem; }
}

/* ─── Section / subjects grid ─────────────────────────────────────── */
@media (max-width: 600px) {
  .section               { padding: 2.5rem 1rem; }
  .subjects-grid         { grid-template-columns: 1fr; }
  .exam-info-grid        { grid-template-columns: repeat(2, 1fr); }
  .tools-grid            { grid-template-columns: 1fr; gap: 0; }
}

/* ─── Question Bank layout ────────────────────────────────────────── */
@media (max-width: 900px) {
  .qb-layout             { grid-template-columns: 1fr; padding: 1.25rem 1rem; }
  .sidebar               { position: static; }
}

/* Sidebar scrollable horizontally on mobile */
@media (max-width: 600px) {
  .qb-layout             { padding: 1rem; }
  .sidebar               {
    display: flex; flex-direction: row; flex-wrap: wrap;
    gap: 0.25rem; padding: 0.875rem;
    overflow-x: auto; -webkit-overflow-scrolling: touch;
  }
  .sidebar-section-title { display: none; }
  .filter-sep            { display: none; }
  .filter-btn            {
    flex: 0 0 auto; width: auto;
    padding: 0.3rem 0.75rem;
    border-radius: 20px; border: 1px solid var(--border-med);
    font-size: 0.78rem;
  }
  .filter-btn.active {
    background: var(--red); color: #fff; border-color: var(--red);
  }
  .filter-count          { display: none; }
  .qb-toolbar            { flex-direction: column; }
  .q-search              { min-width: 0; }
  .q-text                { font-size: 0.9rem; }
  .opt-val               { font-size: 0.82rem; }
  .q-actions             { flex-wrap: wrap; }
}

/* ─── Exam bar ─────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .exam-bar-inner        { flex-wrap: wrap; gap: 0.375rem; padding: 0.5rem 1rem; }
  .exam-timer            { font-size: 1rem; margin-left: 0; }
  .exam-counter          { font-size: 0.75rem; }
}

/* ─── Flashcards ──────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .flashcard             { height: 280px; }
  .fc-face               { padding: 1.75rem 1.25rem; }
  .fc-term               { font-size: 1.25rem; }
  .fc-def                { font-size: 0.82rem; }
  .fc-controls           { gap: 0.5rem; }
  .fc-btn                { padding: 0.6rem 1rem; font-size: 0.82rem; }
  .fc-btn.nav            { padding: 0.45rem 0.875rem; font-size: 0.75rem; }
}

/* ─── Progress page ───────────────────────────────────────────────── */
@media (max-width: 768px) {
  .prog-layout           { padding: 1.25rem 1rem; }
  .prog-stats            { grid-template-columns: repeat(2, 1fr); }
  .prog-stat-val         { font-size: 1.75rem; }
  .charts-grid           { grid-template-columns: 1fr; }
  .charts-grid .chart-card:first-child { grid-column: 1; }
}

@media (max-width: 480px) {
  .prog-stats            { grid-template-columns: 1fr 1fr; gap: 0.625rem; }
  .prog-stat             { padding: 1rem; }
  .prog-stat-val         { font-size: 1.5rem; }
  .topic-bars            { padding: 1rem 0.875rem; }
  .tb-row                { grid-template-columns: 1fr 80px 44px; gap: 0.625rem; }
  .tb-name               { font-size: 0.78rem; }
}

/* ─── Past papers ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .pp-grid               { grid-template-columns: 1fr; padding: 1rem; }
  .pp-filters            { padding: 1rem 1rem 0; }
  .pp-year               { font-size: 2rem; }
}

/* ─── Modal ───────────────────────────────────────────────────────── */
@media (max-width: 500px) {
  .modal                 { padding: 1.5rem 1.25rem; border-radius: 14px; }
  .modal-bg              { padding: 0.75rem; align-items: flex-end; }
  .modal                 { border-radius: 18px 18px 0 0; max-height: 92vh; }
}

/* ─── Result screen ───────────────────────────────────────────────── */
@media (max-width: 500px) {
  .result-card           { padding: 1.75rem 1.25rem; border-radius: 16px; }
  .result-stats          { grid-template-columns: repeat(3, 1fr); }
  .rs-val                { font-size: 1.25rem; }
}

/* ─── Page header ─────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .page-header           { padding: 1.75rem 1rem; }
  .page-header h1        { font-size: 1.6rem; }
  .page-header p         { font-size: 0.82rem; }
}

/* ─── Footer ──────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .footer-inner          { flex-direction: column; gap: 0.875rem; }
  .footer-links          { margin-left: 0; flex-wrap: wrap; }
}

/* ─── History table ────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .history-table th:nth-child(5),
  .history-table td:nth-child(5) { display: none; } /* hide Duration column */
}

/* ─── Utility: touch targets ──────────────────────────────────────── */
@media (max-width: 768px) {
  .btn, .btn-nav, .filter-btn, .fc-btn, .mode-tab {
    min-height: 40px; /* iOS recommended touch target */
  }
  .q-option { padding: 0.75rem 0.875rem; }
}

/* ─── Reduced motion ──────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .fc-inner              { transition: none !important; }
  .btn-primary:hover     { transform: none; }
  .subject-card:hover    { transform: none; }
  .fc-prog-fill          { transition: none; }
}

/* ─── Dark mode (system-level) ────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  /* Uncomment to enable dark mode — adjust to match your design vision */
  /*
  :root {
    --bg:         #111111;
    --bg-white:   #1C1C1E;
    --ink:        #F5F5F7;
    --ink-2:      #AEAEB2;
    --ink-3:      #636366;
    --border:     rgba(255,255,255,0.1);
    --border-med: rgba(255,255,255,0.16);
  }
  */
}