:root {
  --ink: #142b3b;
  --ink-soft: #3c5362;
  --paper: #f5f1e7;
  --paper-deep: #ebe4d5;
  --card: rgba(255, 253, 247, 0.92);
  --line: #d8d0c0;
  --teal: #167f7a;
  --teal-light: #dcece7;
  --red: #b4463f;
  --red-light: #f6e3df;
  --gold: #b78d3d;
  --gold-light: #f3ead4;
  --shadow: 0 18px 50px rgba(20, 43, 59, 0.1);
  --radius: 20px;
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: "Inter", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 5%, rgba(183, 141, 61, 0.12), transparent 28rem),
    radial-gradient(circle at 92% 20%, rgba(22, 127, 122, 0.09), transparent 26rem),
    var(--paper);
  font-family: var(--sans);
  line-height: 1.6;
}

button, input, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button { color: inherit; }
a { color: inherit; text-decoration: none; }

.paper-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.28;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.035'/%3E%3C/svg%3E");
  z-index: 20;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto minmax(100px, 1fr);
  align-items: center;
  min-height: 78px;
  padding: 12px clamp(18px, 4vw, 64px);
  border-bottom: 1px solid rgba(20, 43, 59, 0.12);
  background: rgba(245, 241, 231, 0.88);
  backdrop-filter: blur(18px);
}

.brand { display: inline-flex; align-items: center; gap: 12px; width: fit-content; }
.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--red);
  color: var(--red);
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 700;
  transform: rotate(-2deg);
}
.brand strong, .brand small { display: block; line-height: 1.25; }
.brand strong { font-family: var(--serif); font-size: 16px; letter-spacing: 0.06em; }
.brand small { margin-top: 4px; color: var(--ink-soft); font-size: 11px; letter-spacing: 0.18em; }

.main-nav { display: flex; gap: 6px; padding: 5px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.45); }
.main-nav a { padding: 7px 18px; border-radius: 999px; color: var(--ink-soft); font-size: 14px; transition: .2s ease; }
.main-nav a:hover, .main-nav a.active { color: #fff; background: var(--ink); }
.nav-glyph { display: none; }

.bank-chip { justify-self: end; display: flex; align-items: baseline; gap: 8px; color: var(--ink-soft); font-size: 12px; }
.bank-chip strong { color: var(--ink); font-family: var(--serif); font-size: 24px; }

#app { width: min(1180px, calc(100% - 36px)); min-height: calc(100vh - 150px); margin: 0 auto; padding: 54px 0 76px; outline: none; }

.eyebrow { margin: 0 0 12px; color: var(--red); font-size: 12px; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.28; }
h1 { margin-bottom: 18px; font-size: clamp(36px, 6vw, 68px); letter-spacing: -.025em; }
h2 { font-size: clamp(25px, 3vw, 36px); }
h3 { font-size: 20px; }
.lede { max-width: 650px; color: var(--ink-soft); font-size: 17px; }
.muted { color: var(--ink-soft); }
.fine-print { color: var(--ink-soft); font-size: 12px; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.45fr .55fr;
  gap: 44px;
  overflow: hidden;
  padding: clamp(34px, 6vw, 70px);
  border: 1px solid rgba(20,43,59,.14);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
}
.hero::after {
  content: "XC";
  position: absolute;
  right: -24px;
  bottom: -76px;
  color: rgba(20,43,59,.035);
  font-family: Georgia, serif;
  font-size: 260px;
  font-weight: 800;
  line-height: 1;
}
.hero-copy { position: relative; z-index: 1; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero-side { position: relative; z-index: 1; align-self: stretch; display: flex; align-items: flex-end; }
.daily-card { width: 100%; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: rgba(245,241,231,.72); }
.daily-card strong { display: block; margin: 8px 0; font-family: var(--serif); font-size: 34px; }
.daily-card .mini-rule { width: 44px; height: 2px; margin: 18px 0; background: var(--red); }

.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 46px; padding: 10px 19px; border: 1px solid transparent; border-radius: 12px; background: var(--ink); color: white; cursor: pointer; font-weight: 700; transition: transform .18s ease, box-shadow .18s ease, background .18s ease; }
.button:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(20,43,59,.14); }
.button.secondary { border-color: var(--line); background: transparent; color: var(--ink); }
.button.teal { background: var(--teal); }
.button.red { background: var(--red); }
.button:disabled { cursor: not-allowed; opacity: .45; transform: none; box-shadow: none; }
.text-button { padding: 0; border: 0; border-bottom: 1px solid currentColor; background: none; cursor: pointer; color: var(--ink-soft); font-size: 12px; }

.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin: 22px 0 54px; }
.stat-card, .panel, .setup-card, .question-card, .result-card { border: 1px solid rgba(20,43,59,.13); border-radius: var(--radius); background: var(--card); box-shadow: 0 10px 30px rgba(20,43,59,.05); }
.stat-card { padding: 23px; }
.stat-card span { display: block; margin-bottom: 10px; color: var(--ink-soft); font-size: 12px; letter-spacing: .08em; }
.stat-card strong { font-family: var(--serif); font-size: 32px; font-weight: 700; }
.stat-card small { margin-left: 4px; color: var(--ink-soft); }

.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.section-head h2, .section-head p { margin-bottom: 0; }
.dashboard-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
.panel { min-width: 0; padding: 28px; }
.topic-list { display: grid; gap: 18px; }
.topic-row { display: grid; grid-template-columns: minmax(120px, 1fr) minmax(150px, 2fr) auto; align-items: center; gap: 14px; }
.topic-row strong { font-size: 14px; }
.bar { overflow: hidden; height: 8px; border-radius: 99px; background: var(--paper-deep); }
.bar > span { display: block; height: 100%; border-radius: inherit; background: var(--teal); }
.topic-row small { min-width: 50px; text-align: right; color: var(--ink-soft); }
.insight-list { display: grid; gap: 12px; margin: 0; padding: 0; list-style: none; }
.insight-list li { padding: 14px 0; border-bottom: 1px solid var(--line); }
.insight-list li:last-child { border-bottom: 0; }
.insight-list strong { display: block; font-family: var(--serif); font-size: 24px; }

.page-intro { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 30px; }
.page-intro h1 { margin-bottom: 8px; font-size: clamp(34px, 5vw, 52px); }

.setup-card { padding: clamp(24px, 5vw, 44px); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 24px; }
.field { display: grid; gap: 9px; }
.field > span { font-size: 13px; font-weight: 700; }
.field select { width: 100%; min-height: 46px; padding: 0 14px; border: 1px solid var(--line); border-radius: 10px; background: #fffdf8; color: var(--ink); }
.field.full { grid-column: 1 / -1; }
.segmented { display: flex; flex-wrap: wrap; gap: 8px; }
.segmented label { cursor: pointer; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span { display: block; padding: 9px 16px; border: 1px solid var(--line); border-radius: 999px; background: #fffdf8; font-size: 13px; transition: .18s ease; }
.segmented input:checked + span { border-color: var(--ink); background: var(--ink); color: white; }
.switch-row { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; border-top: 1px solid var(--line); }
.switch { position: relative; width: 46px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; border-radius: 99px; background: #c9c3b7; cursor: pointer; transition: .2s; }
.switch span::after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px; border-radius: 50%; background: white; transition: .2s; }
.switch input:checked + span { background: var(--teal); }
.switch input:checked + span::after { transform: translateX(20px); }
.setup-actions { display: flex; justify-content: flex-end; margin-top: 28px; }

.quiz-shell { width: min(860px, 100%); margin: 0 auto; }
.quiz-topline { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; margin-bottom: 18px; }
.progress-track { height: 7px; overflow: hidden; border-radius: 99px; background: var(--paper-deep); }
.progress-track span { display: block; height: 100%; border-radius: inherit; background: var(--red); transition: width .25s ease; }
.timer { min-width: 84px; font-variant-numeric: tabular-nums; font-weight: 800; text-align: right; }
.question-card { padding: clamp(24px, 5vw, 46px); }
.question-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-bottom: 22px; }
.tag { display: inline-flex; align-items: center; min-height: 26px; padding: 3px 9px; border-radius: 7px; background: var(--teal-light); color: #0b625e; font-size: 12px; font-weight: 700; }
.tag.neutral { background: var(--gold-light); color: #745820; }
.question-number { margin-left: auto; color: var(--ink-soft); font-size: 12px; }
.question-title { margin-bottom: 28px; font-family: var(--serif); font-size: clamp(21px, 3vw, 29px); font-weight: 700; line-height: 1.65; }
.options { display: grid; gap: 12px; }
.option { display: grid; grid-template-columns: 34px 1fr; align-items: start; gap: 13px; width: 100%; min-height: 58px; padding: 16px; border: 1px solid var(--line); border-radius: 13px; background: #fffdf8; cursor: pointer; text-align: left; transition: .18s ease; }
.option:hover { border-color: var(--teal); transform: translateX(2px); }
.option.selected { border-color: var(--ink); background: #eef0ec; }
.option.correct { border-color: var(--teal); background: var(--teal-light); }
.option.wrong { border-color: var(--red); background: var(--red-light); }
.option.disabled { cursor: default; transform: none; }
.option-key { display: grid; width: 29px; height: 29px; place-items: center; border: 1px solid currentColor; border-radius: 8px; font-size: 12px; font-weight: 800; }
.option-text { padding-top: 1px; }
.quiz-actions { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 28px; }
.quiz-primary-actions { display: flex; gap: 10px; }
.answer-panel { margin-top: 20px; padding: 20px; border-left: 4px solid var(--teal); border-radius: 0 12px 12px 0; background: var(--teal-light); }
.answer-panel.wrong { border-left-color: var(--red); background: var(--red-light); }
.answer-panel strong { display: block; margin-bottom: 7px; }

.result-card { width: min(820px, 100%); margin: 0 auto; padding: clamp(30px, 6vw, 62px); text-align: center; }
.result-seal { display: grid; width: 92px; height: 92px; margin: 0 auto 24px; place-items: center; border: 2px solid var(--red); border-radius: 50%; color: var(--red); font-family: var(--serif); font-size: 34px; font-weight: 800; }
.result-card h1 { margin-bottom: 8px; font-size: clamp(34px, 5vw, 54px); }
.result-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 32px 0; }
.result-stats div { padding: 18px 8px; border: 1px solid var(--line); border-radius: 12px; background: rgba(245,241,231,.6); }
.result-stats strong { display: block; font-family: var(--serif); font-size: 28px; }
.result-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }

.wrong-toolbar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.wrong-list { display: grid; gap: 12px; }
.wrong-item { display: grid; grid-template-columns: auto 1fr auto; align-items: start; gap: 16px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); }
.wrong-index { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 50%; background: var(--red-light); color: var(--red); font-size: 12px; font-weight: 800; }
.wrong-item h3 { margin-bottom: 7px; font-family: var(--sans); font-size: 15px; line-height: 1.6; }
.wrong-answer { color: var(--teal); font-size: 13px; font-weight: 700; }
.icon-button { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid var(--line); border-radius: 9px; background: transparent; cursor: pointer; }
.empty-state { padding: 64px 24px; border: 1px dashed var(--line); border-radius: var(--radius); text-align: center; }
.empty-state strong { display: block; margin-bottom: 9px; font-family: var(--serif); font-size: 24px; }

.site-footer { display: flex; justify-content: space-between; width: min(1180px, calc(100% - 36px)); margin: 0 auto; padding: 20px 0 30px; border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; }
.toast { position: fixed; right: 22px; bottom: 22px; z-index: 30; max-width: min(360px, calc(100vw - 44px)); padding: 12px 18px; border-radius: 10px; background: var(--ink); color: white; box-shadow: var(--shadow); opacity: 0; transform: translateY(12px); pointer-events: none; transition: .25s ease; }
.toast.show { opacity: 1; transform: translateY(0); }

@media (max-width: 860px) {
  body { padding-bottom: env(safe-area-inset-bottom); }
  .topbar { grid-template-columns: 1fr; min-height: 64px; padding: max(10px, env(safe-area-inset-top)) 18px 10px; background: rgba(245,241,231,.97); backdrop-filter: none; }
  .brand strong { font-size: 14px; }
  .brand small { display: none; }
  .bank-chip { display: none; }
  .main-nav { position: fixed; right: 12px; bottom: max(10px, env(safe-area-inset-bottom)); left: 12px; z-index: 15; justify-content: space-around; gap: 3px; min-height: 64px; padding: 6px; border-radius: 20px; background: rgba(255,253,247,.96); box-shadow: 0 12px 35px rgba(20,43,59,.2); backdrop-filter: blur(18px); }
  .main-nav a { display: flex; flex: 1; min-width: 0; min-height: 50px; padding: 5px 4px; align-items: center; justify-content: center; flex-direction: column; gap: 1px; border-radius: 15px; font-size: 11px; line-height: 1.1; text-align: center; }
  .nav-glyph { display: grid; width: 24px; height: 24px; place-items: center; font-family: var(--sans); font-size: 18px; font-weight: 800; line-height: 1; }
  #app { width: min(100% - 24px, 720px); padding-top: 28px; padding-bottom: calc(112px + env(safe-area-inset-bottom)); }
  .hero { grid-template-columns: 1fr; gap: 28px; padding: 32px 26px; }
  .hero-side { max-width: 420px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
  .site-footer { padding-bottom: calc(104px + env(safe-area-inset-bottom)); }
  body.quiz-mode { overflow: hidden; }
  .quiz-mode .topbar, .quiz-mode .main-nav, .quiz-mode .site-footer { display: none; }
  .quiz-mode #app { width: 100%; height: 100dvh; min-height: 100svh; padding: max(8px, env(safe-area-inset-top)) 10px max(8px, env(safe-area-inset-bottom)); }
  .quiz-mode .quiz-shell { display: flex; height: 100%; flex-direction: column; }
  .quiz-mode .quiz-topline { flex: 0 0 auto; margin-bottom: 8px; }
  .quiz-mode .question-card { display: flex; min-height: 0; flex: 1; flex-direction: column; overflow: hidden; }
  .quiz-mode .options { min-height: 0; flex: 1; overflow-y: auto; overscroll-behavior: contain; }
}

@media (max-width: 560px) {
  .brand-mark { width: 36px; height: 36px; font-size: 20px; }
  .brand { gap: 10px; }
  h1 { font-size: 36px; }
  .hero { padding: 28px 24px; border-radius: 20px; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
  .hero-actions .button { padding-inline: 10px; font-size: 14px; }
  .stats-grid { gap: 8px; margin-bottom: 38px; }
  .stat-card { padding: 17px; }
  .stat-card strong { font-size: 27px; }
  .page-intro { align-items: start; flex-direction: column; }
  .form-grid { grid-template-columns: 1fr; }
  .field.full { grid-column: auto; }
  .question-card { border-radius: 16px; }
  .quiz-topline { grid-template-columns: auto 1fr; }
  .quiz-topline .timer { grid-column: 1 / -1; text-align: left; }
  .question-card { padding: 22px 16px; }
  .question-title { font-size: 21px; line-height: 1.6; }
  .option { grid-template-columns: 32px 1fr; gap: 10px; padding: 14px 12px; }
  .quiz-actions { position: sticky; bottom: calc(82px + env(safe-area-inset-bottom)); z-index: 4; align-items: stretch; margin: 24px -4px -6px; padding: 10px 4px 6px; border-top: 1px solid var(--line); background: rgba(255,253,247,.97); backdrop-filter: blur(12px); }
  .quiz-actions > .button { flex: 0 0 auto; padding-inline: 13px; }
  .quiz-primary-actions { display: flex; flex: 1; justify-content: flex-end; }
  .quiz-primary-actions .button { flex: 1; min-width: 0; padding-inline: 12px; }
  .result-stats { grid-template-columns: repeat(3, 1fr); }
  .result-stats div { padding: 14px 4px; }
  .result-stats strong { font-size: 24px; }
  .wrong-item { grid-template-columns: auto 1fr; }
  .wrong-item .icon-button { grid-column: 2; justify-self: end; }
  .site-footer { align-items: flex-start; gap: 12px; flex-direction: column; }
  .topic-row { grid-template-columns: minmax(0, 1fr) auto; gap: 8px 12px; }
  .topic-row .bar { grid-column: 1 / -1; grid-row: 2; }
  .quiz-mode .quiz-topline { grid-template-columns: auto 1fr auto; gap: 10px; }
  .quiz-mode .quiz-topline .timer { grid-column: auto; text-align: right; }
  .quiz-mode .question-card { padding: 14px 12px 10px; }
  .quiz-mode .question-meta { gap: 6px; margin-bottom: 8px; }
  .quiz-mode .question-number { display: none; }
  .quiz-mode .question-title { margin-bottom: 9px; font-size: clamp(17px, 5vw, 20px); line-height: 1.45; }
  .quiz-mode .options { gap: 6px; }
  .quiz-mode .option { grid-template-columns: 28px 1fr; min-height: 0; gap: 8px; padding: clamp(7px, 1.2vh, 11px) 10px; font-size: 14px; line-height: 1.35; }
  .quiz-mode .option-key { width: 26px; height: 26px; border-radius: 7px; }
  .quiz-mode .answer-panel { margin-top: 7px; padding: 8px 10px; font-size: 13px; line-height: 1.4; }
  .quiz-mode .answer-panel > div { display: none; }
  .quiz-mode .answer-panel .fine-print { margin-top: 3px !important; }
  .quiz-mode .quiz-actions { position: static; margin: 8px 0 0; padding: 8px 0 0; background: transparent; backdrop-filter: none; }
  .quiz-mode .quiz-actions .button { min-height: 42px; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}