@charset "UTF-8";

/* ─────────────────────────────────────────────────────────────
   四百问 · 答题本 — 样式
   设计原则：低饱和柔和配色、充足留白、清晰层级、各屏幕易读
   ───────────────────────────────────────────────────────────── */

:root {
  /* 背景与表面 */
  --bg: #f7f6f2;
  --surface: #ffffff;
  --surface-2: #fcfbf8;
  --surface-3: #f2f1ec;

  /* 文字（均为深灰系，避免纯黑带来的强对比） */
  --ink: #333a3c;
  --ink-2: #5c6669;
  --ink-3: #737d80;

  /* 线条 */
  --line: #e7e5df;
  --line-soft: #f0eee9;

  /* 主色：鼠尾草绿（低饱和） */
  --accent: #7e9b94;
  --accent-deep: #5e7c75;
  --accent-wash: #eef4f1;
  --accent-line: #cdded8;

  /* 四个难度层的柔和色 */
  --sage: #86a08c;
  --sage-wash: #eef4ee;
  --mist: #8ea8b5;
  --mist-wash: #edf2f5;
  --clay: #c0a08f;
  --clay-wash: #f7f0ea;
  --lilac: #a397b1;
  --lilac-wash: #f2eff5;

  --danger: #ab7a74;
  --danger-wash: #f8efed;

  --shadow-sm: 0 1px 2px rgba(51, 58, 60, .03), 0 8px 26px rgba(51, 58, 60, .035);
  --shadow-md: 0 2px 6px rgba(51, 58, 60, .05), 0 16px 40px rgba(51, 58, 60, .07);

  --radius-card: 16px;
  --radius-ctl: 10px;
  --topbar-h: 66px;

  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei",
          "Segoe UI", system-ui, -apple-system, sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, p, ol, ul { margin: 0; }
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--accent-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ── 顶栏 ─────────────────────────────────────────────────── */
.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  height: var(--topbar-h);
  background: rgba(247, 246, 242, .9);
  backdrop-filter: saturate(1.3) blur(12px);
  -webkit-backdrop-filter: saturate(1.3) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  width: 100%;
  max-width: 1080px;
  height: 100%;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 0;
  background: transparent;
  padding: 4px 2px;
  text-align: left;
}
.brand-mark {
  width: 32px; height: 32px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: var(--accent-wash);
  color: var(--accent-deep);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0;
}
.brand-text { display: flex; align-items: baseline; gap: 8px; }
.brand-title { font-size: 16px; font-weight: 600; letter-spacing: .02em; }
.brand-sub { font-size: 12px; color: var(--ink-3); letter-spacing: .08em; }
.topbar-right { display: flex; align-items: center; gap: 14px; }
.global-progress { font-size: 12.5px; color: var(--ink-3); white-space: nowrap; }

/* ── 按钮 ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 38px;
  padding: 0 16px;
  border-radius: var(--radius-ctl);
  border: 1px solid transparent;
  font-size: 13.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: background-color .18s ease, border-color .18s ease,
              color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(94, 124, 117, .16);
}
.btn-primary:hover { background: var(--accent-deep); }
.btn-soft {
  background: var(--surface);
  color: var(--ink-2);
  border-color: var(--line);
}
.btn-soft:hover { background: var(--surface-3); border-color: #dcd9d1; }
.btn-ghost {
  background: transparent;
  color: var(--ink-2);
  border-color: var(--line);
  min-height: 34px;
  padding: 0 13px;
  font-size: 13px;
}
.btn-ghost:hover { background: var(--surface); border-color: var(--accent-line); color: var(--accent-deep); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #986c67; }
.btn-icon { padding: 0 14px; }

.icon-btn {
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border: 0; border-radius: 8px;
  background: transparent;
  color: var(--ink-3);
  font-size: 22px;
  line-height: 1;
  transition: background-color .18s ease, color .18s ease;
}
.icon-btn:hover { background: var(--surface-3); color: var(--ink); }

/* ── 首页 · Hero ──────────────────────────────────────────── */
.hero { padding: 76px 0 60px; max-width: 720px; }
.eyebrow {
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--accent-deep);
  margin-bottom: 20px;
}
.hero h1 {
  font-size: clamp(34px, 5.2vw, 52px);
  line-height: 1.3;
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--ink);
}
.hero-desc {
  margin-top: 24px;
  max-width: 560px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-2);
}
.hero-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 28px;
  font-size: 13px;
  color: var(--ink-3);
}
.hero-meta strong { color: var(--ink); font-weight: 600; font-size: 14px; }
.hero-meta .dot { width: 3px; height: 3px; border-radius: 50%; background: #c9cbc6; }

.continue-slot { margin-top: 32px; }
.continue-card {
  width: 100%;
  max-width: 520px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  border: 1px solid var(--accent-line);
  border-radius: 14px;
  background: var(--accent-wash);
  text-align: left;
  transition: transform .18s ease, box-shadow .18s ease;
}
.continue-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.continue-text { display: flex; flex-direction: column; gap: 2px; flex: 1; min-width: 0; }
.continue-label { font-size: 12px; color: var(--accent-deep); }
.continue-text strong {
  font-size: 15px; font-weight: 600; color: var(--ink);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.continue-progress { font-size: 12.5px; color: var(--ink-2); white-space: nowrap; }
.continue-arrow { color: var(--accent-deep); font-size: 18px; }

.method {
  margin-top: 36px;
  max-width: 640px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}
.method summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--ink-2);
  transition: color .18s ease;
}
.method summary::-webkit-details-marker { display: none; }
.method summary::before {
  content: "";
  width: 6px; height: 6px;
  border-right: 1.5px solid var(--ink-3);
  border-bottom: 1.5px solid var(--ink-3);
  transform: rotate(-45deg);
  transition: transform .2s ease;
}
.method[open] summary::before { transform: rotate(45deg); }
.method summary:hover { color: var(--accent-deep); }
.method-body {
  padding: 16px 0 4px;
  font-size: 13.5px;
  line-height: 1.9;
  color: var(--ink-2);
}
.method-body p + ol, .method-body ol + p { margin-top: 12px; }
.method-body ol { padding-left: 20px; }
.method-body li { padding: 2px 0; }
.method-body b { color: var(--ink); font-weight: 600; }
.method-note { color: var(--ink-3); font-size: 13px; }

/* ── 首页 · 题库分组 ──────────────────────────────────────── */
.bank-groups { padding-bottom: 24px; }
.level-block { margin-top: 52px; }
.level-block:first-child { margin-top: 8px; }
.level-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}
.level-index {
  flex: none;
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border-radius: 10px;
  font-size: 13px; font-weight: 600;
  background: var(--tone-wash);
  color: var(--tone);
}
.level-copy { flex: 1; min-width: 0; }
.level-title {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-size: 19px; font-weight: 600; letter-spacing: .01em;
}
.level-stars { font-size: 12px; letter-spacing: .12em; color: var(--tone); }
.level-hint { margin-top: 3px; font-size: 13px; color: var(--ink-3); }
.level-count { font-size: 12.5px; color: var(--ink-3); white-space: nowrap; padding-top: 6px; }

.section-label {
  font-size: 12.5px;
  color: var(--ink-3);
  letter-spacing: .1em;
  margin: 0 0 14px 2px;
}
.section-block + .section-block { margin-top: 34px; }

.bank-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}
.bank-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 196px;
  padding: 20px 21px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform .2s ease, box-shadow .2s ease,
              border-color .2s ease, background-color .2s ease;
  cursor: pointer;
}
.bank-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-line);
}
.bank-card:focus-visible { outline-offset: 4px; }
.bank-card-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.bank-tag {
  font-size: 11.5px;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--tone-wash);
  color: var(--tone);
  letter-spacing: .04em;
  white-space: nowrap;
}
.bank-count { font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.bank-name {
  margin-top: 16px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: .01em;
}
.bank-intro {
  margin-top: 7px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-2);
  flex: 1;
}
.bank-foot {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  align-items: center;
  gap: 10px;
}
.bank-range { font-size: 11.5px; color: var(--ink-3); white-space: nowrap; }
.mini-track {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--surface-3);
  overflow: hidden;
  min-width: 24px;
}
.mini-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
  transition: width .3s ease;
}
.bank-progress { font-size: 11.5px; color: var(--ink-3); white-space: nowrap; }
.bank-card.is-done .bank-tag { background: var(--accent-wash); color: var(--accent-deep); }
.bank-cta {
  margin-top: 13px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 500;
  color: var(--accent-deep);
}
.bank-cta span { transition: transform .2s ease; }
.bank-card:hover .bank-cta span { transform: translateX(4px); }

.home-footer {
  margin-top: 72px;
  padding: 26px 0 48px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--ink-3);
}

/* ── 答题页 ──────────────────────────────────────────────── */
.quiz-head { padding-top: 40px; }
.link-back {
  border: 0; background: transparent;
  padding: 2px 0;
  font-size: 13px;
  color: var(--ink-3);
  transition: color .18s ease;
}
.link-back:hover { color: var(--accent-deep); }
.quiz-kicker {
  margin-top: 26px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--accent-deep);
}
.quiz-title { margin-top: 6px; font-size: clamp(26px, 3.6vw, 34px); font-weight: 600; letter-spacing: -.01em; }
.quiz-intro { margin-top: 10px; font-size: 14px; color: var(--ink-2); }

.quiz-toolbar {
  margin-top: 30px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  flex-wrap: wrap;
}
.progress-block { flex: 1 1 220px; min-width: 180px; }
.progress-label {
  display: flex; align-items: baseline; justify-content: space-between; gap: 12px;
  font-size: 13px; color: var(--ink-2);
}
.save-hint { font-size: 12px; color: var(--accent-deep); opacity: 0; transition: opacity .3s ease; }
.save-hint.is-visible { opacity: 1; }
.progress-track {
  margin-top: 9px;
  height: 6px;
  border-radius: 999px;
  background: var(--surface-3);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: var(--accent);
  transition: width .3s ease;
}
.toolbar-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.segmented {
  display: inline-flex;
  padding: 3px;
  border-radius: 9px;
  background: var(--surface-3);
  gap: 2px;
}
.seg {
  border: 0;
  background: transparent;
  padding: 6px 11px;
  border-radius: 7px;
  font-size: 12.5px;
  color: var(--ink-2);
  white-space: nowrap;
  transition: background-color .18s ease, color .18s ease;
}
.seg:hover { color: var(--ink); }
.seg.is-active { background: var(--surface); color: var(--accent-deep); box-shadow: 0 1px 3px rgba(51,58,60,.07); }

/* ── 题目卡片 ────────────────────────────────────────────── */
.question-list { margin-top: 26px; display: flex; flex-direction: column; gap: 14px; }
.q-card {
  position: relative;
  padding: 22px 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
  scroll-margin-top: calc(var(--topbar-h) + 16px);
}
.q-card::before {
  content: "";
  position: absolute;
  left: 0; top: 22px; bottom: 22px;
  width: 3px;
  border-radius: 0 3px 3px 0;
  background: transparent;
  transition: background-color .2s ease;
}
.q-card.is-answered { border-color: var(--accent-line); }
.q-card.is-answered::before { background: var(--accent); }
.q-card:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-wash); }
.q-head { display: flex; align-items: flex-start; gap: 16px; }
.q-num {
  flex: none;
  min-width: 38px;
  height: 30px;
  padding: 0 8px;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--surface-3);
  color: var(--ink-3);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  margin-top: 2px;
  transition: background-color .2s ease, color .2s ease;
}
.q-card.is-answered .q-num { background: var(--accent-wash); color: var(--accent-deep); }
.q-body { flex: 1; min-width: 0; display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.q-text { font-size: 16.5px; line-height: 1.7; font-weight: 500; color: var(--ink); }
.q-state { flex: none; font-size: 11.5px; color: var(--ink-3); padding-top: 5px; }
.q-card.is-answered .q-state { color: var(--accent-deep); }
.q-answer { margin-top: 16px; padding-left: 54px; }
.q-input {
  display: block;
  width: 100%;
  min-height: 46px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-ctl);
  background: var(--surface-2);
  color: var(--ink);
  font-size: 16px; /* ≥16px，避免移动端浏览器自动缩放 */
  line-height: 1.7;
  resize: none;
  overflow: hidden;
  transition: border-color .2s ease, background-color .2s ease, box-shadow .2s ease;
}
.q-input::placeholder { color: #929b97; }
.q-input:hover { border-color: #dcd9d1; }
.q-input:focus { outline: none; border-color: var(--accent); background: var(--surface); box-shadow: 0 0 0 3px var(--accent-wash); }
.q-card.is-answered .q-input { background: var(--surface); }
.q-tip { margin-top: 7px; font-size: 11.5px; color: var(--ink-3); }

.empty-state {
  padding: 56px 24px;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: var(--radius-card);
  color: var(--ink-3);
  font-size: 14px;
}

.quiz-end {
  margin: 40px 0 80px;
  padding: 30px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.quiz-end-text { flex: 1 1 240px; font-size: 13.5px; color: var(--ink-2); }

/* ── 弹窗 ────────────────────────────────────────────────── */
.modal {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 24px;
}
.modal-backdrop { position: absolute; inset: 0; background: rgba(51, 58, 60, .28); backdrop-filter: blur(3px); }
.modal-card {
  position: relative;
  width: 100%;
  max-width: 520px;
  max-height: min(88dvh, 780px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 24px 70px rgba(51, 58, 60, .16);
  animation: modal-in .22s ease both;
}
.modal-card-sm { max-width: 420px; }
@keyframes modal-in {
  from { opacity: 0; transform: translateY(10px) scale(.99); }
  to   { opacity: 1; transform: none; }
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 24px 16px;
  border-bottom: 1px solid var(--line-soft);
}
.modal-head h3 { font-size: 17px; font-weight: 600; }
.modal-body { padding: 22px 24px 8px; }
.modal-foot {
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 16px 24px 22px;
}
.field-label { font-size: 12.5px; font-weight: 600; color: var(--ink-2); margin-bottom: 12px; letter-spacing: .04em; }
.field-label:not(:first-child) { margin-top: 26px; }

.format-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.format-card {
  position: relative;
  display: flex; flex-direction: column; gap: 4px;
  padding: 15px 15px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  transition: border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}
.format-card:hover { border-color: var(--accent-line); }
.format-card.is-checked { border-color: var(--accent); background: var(--accent-wash); box-shadow: 0 0 0 2px var(--accent-wash); }
.format-card input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.format-card:focus-within { outline: 2px solid var(--accent-deep); outline-offset: 2px; }
.format-tag { font-size: 10.5px; letter-spacing: .1em; color: var(--accent-deep); font-weight: 600; }
.format-name { font-size: 14.5px; font-weight: 600; margin-top: 2px; }
.format-desc { font-size: 11.5px; line-height: 1.6; color: var(--ink-3); }

.option-list { display: flex; flex-direction: column; gap: 8px; }
.option-row {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  font-size: 13.5px;
  transition: border-color .18s ease, background-color .18s ease;
}
.option-row:hover { border-color: var(--accent-line); }
.option-row.is-checked { border-color: var(--accent); background: var(--accent-wash); }
.option-row input { accent-color: var(--accent-deep); width: 15px; height: 15px; flex: none; }
.option-main { display: inline-flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.option-main em { font-style: normal; font-size: 12px; color: var(--ink-3); }

.check-row {
  display: flex; align-items: center; gap: 9px;
  margin-top: 16px;
  font-size: 13.5px;
  color: var(--ink-2);
  cursor: pointer;
}
.check-row input { accent-color: var(--accent-deep); width: 15px; height: 15px; }

.export-summary {
  margin-top: 20px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--surface-3);
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.7;
}
.export-note { margin-top: 12px; font-size: 12px; color: var(--ink-3); line-height: 1.7; }
.confirm-text { font-size: 14px; color: var(--ink-2); line-height: 1.8; }

/* ── 轻提示 ──────────────────────────────────────────────── */
.toast {
  position: fixed;
  left: 50%;
  bottom: 32px;
  transform: translate(-50%, 12px);
  z-index: 80;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--ink);
  color: #fbfbf9;
  font-size: 13px;
  box-shadow: 0 8px 24px rgba(51, 58, 60, .18);
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  max-width: calc(100vw - 32px);
  text-align: center;
}
.toast.is-visible { opacity: 1; transform: translate(-50%, 0); }

/* ── 响应式 ──────────────────────────────────────────────── */
@media (max-width: 960px) {
  .bank-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  :root { --topbar-h: 60px; }
  .container, .topbar-inner { padding: 0 18px; }
  .brand-sub { display: none; }
  .global-progress { display: none; }
  .hero { padding: 52px 0 44px; }
  .hero h1 { font-size: clamp(32px, 8vw, 42px); }
  .hero-desc { font-size: 14.5px; }
  .level-block { margin-top: 42px; }
  .level-head { gap: 11px; }
  .level-title { font-size: 17px; }
  .level-count { display: none; }
  .bank-grid { grid-template-columns: 1fr; gap: 12px; }
  .bank-card { min-height: 0; padding: 18px 19px 16px; }
  .bank-name { margin-top: 13px; font-size: 16px; }
  .home-footer { margin-top: 52px; }

  .quiz-head { padding-top: 28px; }
  .quiz-toolbar { padding: 15px 16px; gap: 16px; }
  .progress-block { flex-basis: 100%; }
  .toolbar-actions { width: 100%; }
  .segmented { flex: 1 1 auto; }
  .seg { flex: 1; padding: 6px 6px; font-size: 12px; }
  .q-card { padding: 18px 18px 20px; }
  .q-head { gap: 12px; }
  .q-text { font-size: 15.5px; }
  .q-answer { padding-left: 0; margin-top: 14px; }
  .q-state { font-size: 11px; }
  .q-num { min-width: 32px; height: 27px; font-size: 12px; }
  .quiz-end { margin-bottom: 60px; }
  .kbd-tip { display: none; }
  .modal { padding: 12px; align-items: end; }
  .modal-card { max-height: 90dvh; border-radius: 18px; }
  .modal-head, .modal-body, .modal-foot { padding-left: 18px; padding-right: 18px; }
}

@media (max-width: 420px) {
  .container, .topbar-inner { padding: 0 14px; }
  .format-grid { grid-template-columns: 1fr; }
  .toolbar-actions .btn-primary { flex: 1; }
  .quiz-end .btn { flex: 1 1 100%; }
  .toast { bottom: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}