:root {
  --study-width: 100%;
  --reading-width: 100%;
  --sheet-width: 540px;
}

.app { width: var(--study-width); max-width: none; }
.screen { padding-bottom: env(safe-area-inset-bottom); }
.screen > .section-pad, .home-buttons { padding-bottom: calc(24px + env(safe-area-inset-bottom)); }
.screen > .topbar, .hero, .quiz-header { overflow-wrap: anywhere; }
body.app-nav-ready .screen > .topbar,
body.app-nav-ready #homeScreen .hero { padding-top: var(--page-controls-space, calc(76px + env(safe-area-inset-top))); }
body.app-nav-ready #quizScreen .quiz-header { padding-top: var(--quiz-controls-space, calc(98px + env(safe-area-inset-top))); }

.quiz-body { width: 100%; max-width: var(--reading-width); margin-inline: auto; }
.qText {
  padding-left: max(12px, env(safe-area-inset-left));
  padding-right: max(12px, env(safe-area-inset-right));
  overflow-wrap: anywhere;
}
.answerDock {
  width: min(var(--study-width), var(--reading-width));
  max-width: 100%;
  padding-left: max(8px, env(safe-area-inset-left));
  padding-right: max(8px, env(safe-area-inset-right));
}
body.app-nav-ready #counterWrap {
  top: max(10px, env(safe-area-inset-top));
  right: max(10px, env(safe-area-inset-right));
  max-width: calc(100% - 74px - env(safe-area-inset-left) - env(safe-area-inset-right));
}
.app-menu-button { left: max(10px, env(safe-area-inset-left)); }
.nav-row { max-width: 100%; }
.nav-btn { min-height: 44px; white-space: nowrap; }
.fixed-page-nav { max-width: calc(100% - 74px - env(safe-area-inset-left) - env(safe-area-inset-right)); }
.sheet {
  width: min(var(--sheet-width), 100%);
  max-height: calc(100vh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  max-height: calc(100dvh - 32px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.sheet::-webkit-scrollbar { display: none; }
.sheetTop { position: sticky; top: -1px; z-index: 2; background: inherit; padding-bottom: 8px; }
.sheetTitle { min-width: 0; overflow-wrap: anywhere; }
.closeBtn { flex-shrink: 0; min-height: 44px; }
.modal {
  z-index: 100;
  padding: max(12px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
}
.category-card, .card, .home-progress-item, .score-box { min-width: 0; }
.big-btn, .category-mini-btn, .home-progress-item { overflow-wrap: anywhere; }
.category-mini-btn, .setting-chip, .pill, .jump-btn, .guide-btn { min-height: 44px; }
html .choice.compact { min-height: 44px !important; }
.app-menu-dialog { max-height: 100vh; max-height: 100dvh; }
.app-menu-heading, .app-menu-links { padding-left: max(16px, env(safe-area-inset-left)); padding-right: max(16px, env(safe-area-inset-right)); }

@media (min-width: 600px) {
  :root {
    --study-width: min(840px, calc(100vw - 32px));
    --reading-width: 760px;
    --sheet-width: 720px;
  }
  .section-pad, .home-buttons { padding: 20px; gap: 16px; }
  #pastMenuScreen .section-pad, #yearMenuScreen .section-pad,
  #categoryScreen .section-pad, #calcCategoryScreen .section-pad { gap: 16px; }
  .home-buttons > .big-btn { grid-column: auto; }
  .home-progress-card { grid-column: 1 / -1; }
  .home-card { min-height: 108px; }
  .category-cards { gap: 16px; }
  #calcCategoryScreen .category-card.full { grid-column: auto; }
  #calcCategoryScreen .training-order, #calcCategoryScreen .small-note { grid-column: 1 / -1; }
  .quiz-floating { flex-direction: row; align-items: center; gap: 10px; }
  .counter { flex-shrink: 0; }
  .nav-row { flex-wrap: nowrap; }
  .quiz-header { padding-inline: 24px; }
  .questionMeta { max-width: var(--reading-width); margin-inline: auto; }
  .answerDock { padding-top: 8px; padding-bottom: calc(10px + env(safe-area-inset-bottom)); }
  .dockList.choiceCount4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .dockList.choiceCount5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .dockList.choiceCount5 .dockCell,
  .dockList.choiceCount5 .dockCell:nth-child(-n+2) { grid-column: auto; }
  html .choice.compact { min-height: 48px !important; }
  .sheet { padding: 20px 24px 24px; }
  .sheetTop { margin-bottom: 14px; }
  .jump-grid, .jump-year-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .score-grid { gap: 16px; }
  #settingsScreen .section-pad { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; }
  #settingsScreen .section-pad > .card { margin: 0; }
  #settingsScreen .section-pad > :last-child { grid-column: 1 / -1; }
}

@media (min-width: 900px) {
  #yearMenuScreen .section-pad { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  #yearMenuScreen .year-tools-card, #yearMenuScreen .small-note { grid-column: 1 / -1; }
  .home-progress-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (min-width: 1200px) {
  :root {
    --study-width: min(1040px, calc(100vw - 64px));
    --reading-width: 800px;
    --sheet-width: 800px;
  }
  .section-pad, .home-buttons { padding-inline: 28px; }
  .home-buttons { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  #yearMenuScreen .section-pad { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* Keep the question visible when a phone is held horizontally. */
@media (min-width: 600px) and (max-height: 500px) {
  :root {
    --study-width: 100%;
    --reading-width: min(800px, calc(100vw - env(safe-area-inset-left) - env(safe-area-inset-right)));
  }
  .section-pad, .home-buttons, .quiz-header { padding-left: max(24px, env(safe-area-inset-left)); padding-right: max(24px, env(safe-area-inset-right)); }
  .quiz-header { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 16px; padding-bottom: 6px; }
  .quiz-title { text-align: left; }
  .quiz-sub { text-align: right; align-self: center; margin-top: 0; }
  .questionMeta { grid-column: 1; width: 100%; display: flex; flex-direction: row; align-items: center; margin-top: 0; gap: 8px; }
  .progressTrack { flex: 1; height: 4px; }
  .statusRow { flex-shrink: 0; }
  .quiz-header > .app-version { grid-column: 2; grid-row: 2; text-align: right; align-self: center; margin: 0; }
  .answerDock { padding: 4px 8px calc(4px + env(safe-area-inset-bottom)); }
  .dockTitle { display: none; }
  html .choice.compact { min-height: 44px !important; }
  .sheet { padding: 12px 18px 16px; }
  .sheetTop { margin-bottom: 8px; }
}