:root {
  --paper: #f3ecdf;
  --paper-card: rgba(255, 252, 247, 0.72);
  --ink: #1a1714;
  --ink-soft: #6d655c;
  --vermilion: #c4372c;
  --vermilion-deep: #a83228;
  --line: rgba(26, 23, 20, 0.14);
  --serif: "Songti SC", "Noto Serif CJK SC", "Noto Serif SC", "STSong", "SimSun", "PMingLiU", "WenQuanYi Micro Hei", "Droid Sans Fallback", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Noto Sans SC", "Microsoft YaHei", "WenQuanYi Micro Hei", "Droid Sans Fallback", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

html,
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
}

body {
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  -webkit-text-size-adjust: 100%;
  background-color: var(--paper);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.28 0 0 0 0 0.2 0 0 0 0 0.12 0 0 0 0.045 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

button,
input { font: inherit; color: inherit; }

button {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

::selection { background: rgba(196, 55, 44, 0.16); }

.sheet {
  width: min(100%, 480px);
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 22px 22px calc(18px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
}

.screen[hidden],
.topbar[hidden],
[hidden] { display: none !important; }

.screen:not([hidden]) {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.topbar .brand,
.topbar .date { margin: 0; }

.topbar .brand {
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: 0.18em;
}

.topbar .date {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.hero { margin-top: 9vh; }

.cover .actions {
  margin-top: auto;
  padding-bottom: 8px;
}

.seal {
  width: 54px;
  height: 54px;
  margin: 0 auto 22px;
  display: grid;
  place-items: center;
  border: 2px solid var(--vermilion);
  box-shadow: inset 0 0 0 1px rgba(196, 55, 44, 0.35);
  color: var(--vermilion);
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1;
  transform: rotate(-8deg);
}

h1 {
  margin: 0;
  font-family: var(--serif);
  font-size: 46px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-indent: 0.16em;
  text-align: center;
  line-height: 1.15;
}

.sub {
  margin: 16px 0 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: 16px;
  letter-spacing: 0.06em;
}

.hero-date {
  margin: 28px 0 0;
  text-align: center;
  font-size: 15px;
  letter-spacing: 0.12em;
}

.actions { margin-top: 36px; }

.note,
.quiet {
  margin: 12px 0 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.quiet { margin-top: 18vh; }

.btn {
  appearance: none;
  border: 1px solid var(--ink);
  background: transparent;
  height: 48px;
  padding: 0 14px;
  letter-spacing: 0.1em;
  cursor: pointer;
}

.btn.primary {
  width: 100%;
  height: 56px;
  border-color: var(--vermilion);
  background: var(--vermilion);
  color: #fbf6ee;
  font-size: 18px;
}

.btn.grow { flex: 1; }

.btn:active { background: rgba(26, 23, 20, 0.05); }

.btn.primary:active { background: var(--vermilion-deep); }

.btn:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

.q-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.progress {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.progress:focus { outline: none; }

.tag {
  margin: 0;
  padding: 2px 8px 3px;
  border: 1px solid rgba(196, 55, 44, 0.55);
  color: var(--vermilion);
  font-size: 13px;
  letter-spacing: 0.16em;
  line-height: 1.4;
}

.meter {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-top: 14px;
}

.meter i {
  display: block;
  height: 2px;
  background: rgba(26, 23, 20, 0.12);
}

.meter i.on { background: var(--vermilion); }

.stem {
  margin: 26px 0 22px;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-indent: 0;
  text-align: left;
  line-height: 1.45;
}

.stem:focus { outline: none; }

.options { display: flex; flex-direction: column; gap: 10px; }

.opt {
  width: 100%;
  min-height: 58px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  text-align: left;
  background: var(--paper-card);
  border: 1px solid var(--line);
  cursor: pointer;
  letter-spacing: 0.02em;
}

.opt-text { flex: 1; }

.opt .badge {
  flex: none;
  min-width: 1.2em;
  font-size: 14px;
  letter-spacing: 0.14em;
}

.opt .badge:empty { display: none; }

.opt.right {
  border-color: rgba(196, 55, 44, 0.9);
  background: rgba(196, 55, 44, 0.07);
}

.opt.right .badge { color: var(--vermilion); }

.opt.wrong {
  color: var(--ink-soft);
  border-color: rgba(26, 23, 20, 0.22);
}

.opt:disabled { cursor: default; }

.opt:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 2px;
}

.feedback {
  min-height: 1.6em;
  margin: 16px 0 0;
  font-size: 16px;
  letter-spacing: 0.04em;
}

.score {
  margin: 12px 0 0;
  text-align: center;
  font-family: var(--serif);
  line-height: 0.9;
}

.score .num {
  font-size: 88px;
  font-weight: 600;
  color: var(--vermilion);
}

.score .den {
  font-size: 30px;
  margin-left: 2px;
  letter-spacing: 0.04em;
}

.comment {
  margin: 12px 0 16px;
  text-align: center;
  font-size: 16px;
  letter-spacing: 0.05em;
}

.card { margin: 0; }

.card img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 750 / 1000;
  background: #efe6d4;
}

.card figcaption {
  margin-top: 10px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 14px;
  letter-spacing: 0.06em;
}

.btn-row {
  display: flex;
  gap: 10px;
  margin-top: 14px;
}

.copy-status {
  min-height: 1.4em;
  margin: 8px 0 0;
  text-align: center;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.review {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.review li {
  padding: 15px 0 14px;
  border-top: 1px solid var(--line);
}

.review-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.idiom {
  margin: 0;
  font-family: var(--serif);
  font-size: 20px;
  letter-spacing: 0.06em;
}

.mark {
  font-size: 14px;
  letter-spacing: 0.14em;
}

.mark.ok { color: var(--vermilion); }

.mark.no { color: var(--ink-soft); }

.line {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.55;
}

.k {
  display: inline-block;
  min-width: 2.4em;
  margin-right: 6px;
  color: var(--ink-soft);
  font-size: 13px;
  letter-spacing: 0.14em;
}

.footer {
  margin-top: auto;
  padding-top: 28px;
  text-align: center;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.1em;
  line-height: 1.7;
}

.footer p { margin: 0; }

.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;
}

.noscript {
  width: min(100%, 480px);
  margin: 24px auto;
  padding: 0 22px;
  text-align: center;
}

@media (min-width: 560px) {
  .sheet {
    border-left: 1px solid var(--line);
    border-right: 1px solid var(--line);
  }
}

@media (max-width: 359px) {
  h1 { font-size: 40px; }
  .stem { font-size: 24px; }
  .score .num { font-size: 76px; }
}