/* ===== Desktop / Tablet Responsive Layout =====
 * Breakpoint: 768px (tablet), 1024px (desktop), 1280px (wide)
 * Mobile-first: these styles layer on top of the existing mobile CSS.
 */

/* ─── Mobile base: layout wrappers behave as simple vertical stacks ─── */
/* Legacy home-layout (kept for compatibility) */
.home-layout {
  margin-top: var(--sp-md);
}
.home-nav {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}
.home-dashboard {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  margin-top: var(--sp-md);
}
.result-layout {
  margin-top: var(--sp-xs);
}
.result-topics {
  margin-top: var(--sp-xs);
}

/* Mode select / topic grids — mobile: vertical stack */
.mode-select-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-xs);
}
.mode-topic-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-sm);
}

/* Settings grid — mobile: vertical stack */
.settings-grid {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
  margin-top: var(--sp-sm);
}

/* Achievements grid — mobile: vertical stack */
.achievements-grid {
  display: flex;
  flex-direction: column;
  gap: var(--sp-sm);
}
.achievements-grid > .card {
  margin-bottom: 0;
}

/* ─── Streak calendar (mobile base) ─── */
.streak-calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 3px;
  max-width: 220px;
  margin: 0 auto;
}
.streak-calendar__day {
  aspect-ratio: 1;
  border-radius: 3px;
  background: var(--c-surface-alt);
  transition: background var(--transition);
}
.streak-calendar__day--active {
  background: var(--c-success);
}
[data-theme="dark"] .streak-calendar__day {
  background: var(--c-surface);
}
[data-theme="dark"] .streak-calendar__day--active {
  background: var(--c-success);
}

/* ─────────────────────────────────────────────────────────────────────
   Tablet+ (≥768px): Widen app container, enable 2-column layouts
   ───────────────────────────────────────────────────────────────────── */
@media (min-width: 768px) {
  #app {
    max-width: 960px;
    padding: var(--sp-lg) var(--sp-xl);
  }

  /* ── Home: new layout ── */
  .home-header-row {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: left;
  }
  .home-title-block {
    text-align: left;
  }
  .home-subtitle--compact {
    display: inline;
  }
  .home-date-badges {
    margin-left: auto;
  }
  .home-menu-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-sm);
  }
  .home-xp-center {
    max-width: 500px;
  }

  /* Legacy 2-column home layout (kept for compat) */
  .home-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-lg);
    align-items: start;
  }
  .home-dashboard {
    margin-top: 0;
    gap: var(--sp-md);
  }
  .home-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }
  .home-nav > .btn--primary {
    grid-column: 1 / -1;
  }

  /* Fixed bottom elements: wider on tablet, centered */
  .home-sakura-fixed,
  .home-trivia-fixed {
    max-width: 960px;
    margin: 0 auto;
  }

  /* ── Quiz: choice grid 2x2 ── */
  .choice-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }

  /* ── Quiz: centered content area for readability ── */
  .quiz-content-area {
    max-width: 720px;
    margin: 0 auto;
  }

  /* ── Result: 2-column layout (summary left, topics right) ── */
  .result-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-lg);
    align-items: start;
  }
  .result-topics {
    margin-top: 0;
  }
  .result-breakdown {
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  }
  .result-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }
  .result-actions .btn--block {
    width: 100%;
  }

  /* ── Mode select: tablet+ layout ── */
  .mode-select-grid {
    gap: var(--sp-sm);
  }
  .mode-topic-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }
  .module-card__body {
    flex-direction: row;
    align-items: baseline;
    gap: var(--sp-sm);
  }

  /* ── Records: wider stats grid ── */
  .records-layout .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  /* Charts side by side */
  .records-charts {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
    margin-top: var(--sp-sm);
  }
  .records-charts .chart-container--donut {
    max-width: 100%;
  }

  /* ── Settings: 2-column card grid ── */
  .settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
    margin-top: var(--sp-sm);
  }
  .settings-grid > .card {
    margin-bottom: 0;
  }
  /* Full-width items that shouldn't be in 2-col */
  .settings-full {
    grid-column: 1 / -1;
  }

  /* ── Achievements: 2-column grid ── */
  .achievements-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }
  .achievements-grid > .card {
    margin-bottom: 0;
  }

  /* ── Hawker grid: 3 columns ── */
  .hawker-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* ── Glossary: 2-column card list ── */
  .glossary-list--desktop {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-sm);
  }

  /* ── Menu cards: breathing room ── */
  .home-nav .menu-card {
    padding: var(--sp-md);
  }

  /* ── Streak calendar: larger ── */
  .streak-calendar {
    gap: 4px;
    max-width: 260px;
  }

  /* ── Exam timer: match wider app ── */
  .exam-timer {
    max-width: 960px;
  }

  /* ── Modal: wider on desktop ── */
  .modal {
    max-width: 520px;
  }

  /* ── Feedback FAB: left-side offset ── */
  .feedback-fab {
    left: var(--sp-sm);
  }

  /* ── Typography: slightly larger on desktop ── */
  .home-title {
    font-size: 2rem;
  }
  .quiz-question {
    font-size: 1.1rem;
    line-height: 1.7;
  }
  .result-score {
    font-size: 4rem;
  }

  /* ── Stat cards: bigger on desktop ── */
  .stat-card {
    padding: var(--sp-md);
  }
  .stat-card__value {
    font-size: 1.8rem;
  }

  /* ── Topic table: more breathing room ── */
  .topic-table th,
  .topic-table td {
    padding: var(--sp-sm) var(--sp-md);
  }
  .accuracy-bar {
    width: 100px;
  }

  /* ── Analysis bar wider ── */
  .analysis-bar {
    width: 120px;
  }

  /* ── Explanation panel: more spacious ── */
  .explanation {
    padding: var(--sp-lg);
    font-size: 0.95rem;
  }

  /* ── Supporter bubble: limit width ── */
  .supporter-bubble {
    max-width: 420px;
  }

  /* ── XP bar: limit width on result page ── */
  .xp-bar {
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ─────────────────────────────────────────────────────────────────────
   Desktop (≥1024px): Further refinements
   ───────────────────────────────────────────────────────────────────── */
@media (min-width: 1024px) {
  #app {
    max-width: 1080px;
  }

  /* ── Home: fixed left column width (legacy) ── */
  .home-layout {
    grid-template-columns: 380px 1fr;
  }

  /* New home layout */
  .home-header-row {
    padding: 0 var(--sp-md);
  }

  /* ── Quiz: more generous max-width ── */
  .quiz-content-area {
    max-width: 780px;
  }

  /* ── Records: donut + line chart layout ── */
  .records-charts {
    grid-template-columns: 280px 1fr;
  }

  /* ── Hawker grid: 4 columns ── */
  .hawker-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  /* ── Mode select topics: 2 columns ── */
  .mode-topic-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .exam-timer {
    max-width: 1080px;
  }

  /* ── Achievements: tighter grid ── */
  .achievements-grid {
    gap: var(--sp-md);
  }
}

/* ─────────────────────────────────────────────────────────────────────
   Wide Desktop (≥1280px): Luxury spacing
   ───────────────────────────────────────────────────────────────────── */
@media (min-width: 1280px) {
  #app {
    max-width: 1200px;
    padding: var(--sp-xl) 48px;
  }

  .home-layout {
    grid-template-columns: 400px 1fr;
    gap: var(--sp-xl);
  }

  /* ── Achievements: 3 columns ── */
  .achievements-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  /* ── Mode select topics: 2 columns ── */
  .mode-topic-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-sm);
  }
}