:root {
  --paper: #f7f1e6;        /* 宣纸米白 */
  --paper-2: #ede4d0;       /* 略深 */
  --ink: #2a2622;           /* 墨色 */
  --ink-soft: #5e564c;      /* 浅墨 */
  --ink-light: #8a8278;     /* 灰墨 */
  --ochre: #a35d2a;         /* 赭石 */
  --ochre-soft: #c89165;    /* 浅赭 */
  --cinnabar: #b34340;      /* 朱砂 (用于错误) */
  --jade: #5e7a4a;          /* 玉青 (用于正确) */
  --line: #c9bfa9;          /* 边框线 */
  --line-soft: #e3d9c2;     /* 软边框 */
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Noto Serif SC", "Songti SC", "STSong", "宋体", serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body {
  background:
    radial-gradient(ellipse at 10% 10%, rgba(167,93,42,0.04) 0%, transparent 40%),
    radial-gradient(ellipse at 90% 80%, rgba(94,122,74,0.04) 0%, transparent 50%),
    var(--paper);
  min-height: 100vh;
}
header.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 32px 32px;
  text-align: center;
  border-bottom: 1px solid var(--line);
  position: relative;
}
header.page::before, header.page::after {
  content: "";
  position: absolute;
  left: 50%; transform: translateX(-50%);
  width: 60px; height: 1px;
  background: var(--ink-light);
}
header.page::before { top: 32px; }
header.page::after  { bottom: 0; }
.kicker {
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--ink-light);
  margin-bottom: 16px;
  text-transform: none;
  font-family: "Kaiti SC", "STKaiti", "KaiTi", serif;
}
h1.title {
  font-family: "Kaiti SC", "STKaiti", "KaiTi", serif;
  font-size: 38px;
  font-weight: 500;
  margin: 0 0 8px;
  letter-spacing: 0.1em;
}
.subtitle {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 8px 0 24px;
  font-family: "Kaiti SC", "STKaiti", serif;
}
.meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 13px;
  color: var(--ink-light);
  letter-spacing: 0.1em;
}
.meta .sep { color: var(--line); }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px;
}
.nav-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
  padding: 12px;
  background: var(--paper-2);
  border-radius: 4px;
  position: sticky;
  top: 0;
  z-index: 10;
  border: 1px solid var(--line-soft);
}
.nav-pills a {
  display: inline-block;
  min-width: 28px;
  padding: 4px 8px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 3px;
  cursor: pointer;
  font-family: "Kaiti SC", "STKaiti", serif;
}
.nav-pills a:hover { background: var(--paper); border-color: var(--line); }
.nav-pills a.answered { background: var(--jade); color: var(--paper); }
.nav-pills a.wrong    { background: var(--cinnabar); color: var(--paper); }
.nav-pills a.current  { border-color: var(--ochre); color: var(--ochre); font-weight: 600; }

.q-card {
  background: #fdfaf2;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 28px 32px;
  margin: 0 0 24px;
  position: relative;
  box-shadow: 0 1px 0 rgba(94,86,76,0.04);
}
.q-card.correct { border-color: var(--jade); border-width: 2px; }
.q-card.wrong   { border-color: var(--cinnabar); border-width: 2px; }
.q-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 16px;
  font-family: "Kaiti SC", "STKaiti", serif;
}
.q-no {
  font-size: 22px;
  color: var(--ochre);
  font-weight: 500;
  letter-spacing: 0.05em;
}
.q-no .badge {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  margin-left: 8px;
  background: var(--paper-2);
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  letter-spacing: 0.1em;
  font-weight: 400;
  vertical-align: middle;
}
.q-no .badge.judge   { color: var(--ochre); border-color: var(--ochre-soft); }
.q-no .badge.fill    { color: var(--jade); border-color: var(--jade); }
.q-no .badge.essay   { color: var(--ink-soft); }
.q-stem {
  font-size: 17px;
  line-height: 1.85;
  margin-bottom: 20px;
  color: var(--ink);
}
.options { margin: 16px 0; }
.opt {
  display: block;
  padding: 10px 16px;
  margin: 6px 0;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  position: relative;
}
.opt:hover { background: var(--paper-2); border-color: var(--line); }
.opt input { margin-right: 12px; vertical-align: middle; }
.opt .ltr {
  display: inline-block;
  width: 22px;
  font-family: "Kaiti SC", "STKaiti", serif;
  color: var(--ochre);
  font-weight: 500;
}
.opt.is-correct { background: #e8f0dd; border-color: var(--jade); color: var(--ink); }
.opt.is-correct::after {
  content: "✓";
  position: absolute; right: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--jade); font-weight: 700;
}
.opt.is-wrong { background: #f6dcd9; border-color: var(--cinnabar); }
.opt.is-wrong::after {
  content: "✗";
  position: absolute; right: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--cinnabar); font-weight: 700;
}
.fill-input, .essay-input {
  width: 100%;
  padding: 10px 14px;
  font-size: 16px;
  font-family: inherit;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  margin: 8px 0;
  color: var(--ink);
}
.fill-input:focus, .essay-input:focus { outline: none; border-color: var(--ochre); }
.essay-input { min-height: 140px; line-height: 1.7; resize: vertical; }

.actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  align-items: center;
}
.btn {
  padding: 8px 20px;
  font-size: 14px;
  font-family: "Kaiti SC", "STKaiti", serif;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--ink-light);
  border-radius: 3px;
  cursor: pointer;
  letter-spacing: 0.15em;
  transition: all 0.15s;
}
.btn:hover { background: var(--paper-2); }
.btn-primary {
  background: var(--ochre);
  color: var(--paper);
  border-color: var(--ochre);
}
.btn-primary:hover { background: #8c4d20; }
.btn-primary:disabled { background: var(--line); border-color: var(--line); cursor: not-allowed; }
.btn-ghost { border-color: var(--line); color: var(--ink-soft); }

.feedback {
  margin-top: 18px;
  padding: 16px 20px;
  border-radius: 4px;
  display: none;
  font-size: 15px;
  line-height: 1.7;
}
.feedback.show { display: block; }
.feedback.right {
  background: #e8f0dd;
  border-left: 3px solid var(--jade);
  color: var(--ink);
}
.feedback.wrong {
  background: #f6dcd9;
  border-left: 3px solid var(--cinnabar);
  color: var(--ink);
}
.feedback .verdict {
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 6px;
  font-family: "Kaiti SC", "STKaiti", serif;
  letter-spacing: 0.1em;
}
.feedback .verdict::before { content: "· "; color: var(--ink-light); }
.feedback .ref-answer {
  display: block;
  margin-top: 10px;
  padding: 10px 14px;
  background: rgba(255,255,255,0.5);
  border-radius: 3px;
  font-size: 15px;
}
.feedback .ref-answer .lbl {
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--ink-light);
  display: block;
  margin-bottom: 4px;
  font-family: "Kaiti SC", "STKaiti", serif;
}
.feedback .analysis-text {
  display: block;
  margin-top: 10px;
  white-space: pre-wrap;
  line-height: 1.85;
}

footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 32px;
  text-align: center;
  font-size: 12px;
  color: var(--ink-light);
  letter-spacing: 0.2em;
  border-top: 1px solid var(--line-soft);
  font-family: "Kaiti SC", "STKaiti", serif;
}

/* 印刷感收尾 */
@media (max-width: 600px) {
  .q-card { padding: 20px 18px; }
  h1.title { font-size: 28px; }
  main { padding: 16px; }
}

/* === index page only === */
.kicker {
  font-size: 13px;
  letter-spacing: 0.4em;
  color: var(--ink-light);
  margin-bottom: 16px;
  font-family: "Kaiti SC", "STKaiti", serif;
}
.subtitle {
  font-size: 16px;
  color: var(--ink-soft);
  margin-top: 12px;
  font-family: "Kaiti SC", "STKaiti", serif;
}
header {
  max-width: 1080px;
  margin: 0 auto;
  padding: 80px 32px 48px;
  text-align: center;
  border-bottom: 1px solid var(--line);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.quiz-card {
  display: block;
  padding: 24px 22px;
  background: #fdfaf2;
  border: 1px solid var(--line);
  border-radius: 6px;
  text-decoration: none;
  color: inherit;
  transition: all 0.2s;
  position: relative;
}
.quiz-card:hover {
  border-color: var(--ochre);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(94,86,76,0.08);
}
.quiz-card::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: var(--ochre);
  opacity: 0;
  transition: opacity 0.2s;
}
.quiz-card:hover::before { opacity: 1; }
.quiz-no {
  font-family: "Kaiti SC", "STKaiti", serif;
  font-size: 13px;
  color: var(--ochre);
  letter-spacing: 0.2em;
  margin-bottom: 8px;
}
.quiz-title {
  font-size: 19px;
  font-weight: 500;
  margin-bottom: 8px;
  line-height: 1.4;
}
.quiz-meta { font-size: 13px; color: var(--ink-light); letter-spacing: 0.1em; }