/* review-center/style.css */
:root {
  color-scheme: light;
  --paper: #f3ebd9;
  --paper-light: #faf5ea;
  --surface: rgba(255,253,246,.88);
  --ink: #1b201c;
  --muted: #6a6f65;
  --line: rgba(60,52,38,.14);
  --red: #a3382a;
  --green: #3d6752;
  --gold: #9c7a2c;
  --shadow: 0 2px 5px rgba(72,57,32,.05), 0 22px 60px rgba(72,57,32,.11);
  --kai: "Kaiti SC","STKaiti","KaiTi","Noto Serif SC",serif;
  --song: "Songti SC","STSong","SimSun","Noto Serif SC",serif;
  --sans: "PingFang SC","Microsoft YaHei","Hiragino Sans GB","Noto Sans SC",system-ui,sans-serif;
  --numeral: "Palatino","Iowan Old Style",Georgia,"Songti SC",serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='260' height='260'%3E%3Cfilter id='p'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.78' numOctaves='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='260' height='260' filter='url(%23p)' opacity='0.05'/%3E%3C/svg%3E") repeat,
    radial-gradient(circle at 10% 4%, rgba(163,56,42,.09), transparent 28rem),
    radial-gradient(circle at 90% 9%, rgba(61,103,82,.09), transparent 26rem),
    linear-gradient(158deg,#faf5ea 0%,var(--paper) 46%,#ece1c9 100%);
  background-attachment: fixed;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { color: #fff7ea; background: var(--red); }
body::before {
  position: fixed; inset: 0; z-index: -1; content: ""; pointer-events: none; opacity: .35;
  background-image: linear-gradient(rgba(72,68,51,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(72,68,51,.045) 1px,transparent 1px);
  background-size: 32px 32px; mask-image: linear-gradient(to bottom,black,transparent 78%);
}
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.wrap { width: min(1180px,calc(100% - 36px)); margin: 0 auto; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 10000; padding: 10px 14px; color: white; background: var(--ink); border-radius: 9px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.review-hero { padding: 28px 0 48px; border-bottom: 1px solid var(--line); }
.hero-top { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 12px; font-family: var(--kai); letter-spacing: .12em; }
.brand > span { display: grid; width: 39px; height: 39px; place-items: center; color: #fff8e9; background: var(--red); border-radius: 10px 10px 10px 3px; font-size: 21px; }
.brand strong { font-size: 16px; }
.export-btn { min-height: 40px; padding: 0 14px; color: var(--muted); background: rgba(255,252,243,.62); border: 1px solid var(--line); border-radius: 11px; cursor: pointer; font-size: 12px; font-weight: 700; }
.export-btn:hover { color: var(--red); border-color: rgba(163,60,47,.32); }
.hero-layout { display: grid; grid-template-columns: minmax(0,1.25fr) minmax(370px,.75fr); gap: 70px; align-items: end; margin-top: 54px; }
.eyebrow { margin: 0 0 15px; color: var(--green); font-size: 12px; font-weight: 900; letter-spacing: .16em; }
h1 { margin: 0; font-family: var(--kai); font-size: clamp(52px,7vw,88px); line-height: .98; letter-spacing: .02em; }
h1 em { display: block; margin-top: 15px; color: var(--red); font-size: .37em; font-style: normal; letter-spacing: .04em; }
.hero-copy > p:last-child { max-width: 700px; margin: 25px 0 0; color: var(--muted); font-family: var(--song); font-size: 16px; line-height: 1.9; }
.hero-stats { display: grid; grid-template-columns: repeat(2,1fr); gap: 1px; overflow: hidden; background: var(--line); border: 1px solid var(--line); border-radius: 20px 20px 20px 6px; box-shadow: var(--shadow); }
.hero-stats div { min-height: 110px; padding: 20px; background: rgba(255,252,243,.82); }
.hero-stats strong, .hero-stats span { display: block; }
.hero-stats strong { color: var(--green); font-family: var(--numeral); font-size: 35px; }
.hero-stats span { margin-top: 6px; color: var(--muted); font-size: 11px; letter-spacing: .08em; }

.review-layout { display: grid; grid-template-columns: minmax(0,1fr) 340px; gap: 24px; align-items: start; padding: 52px 0 70px; }
.review-main { min-width: 0; }
.session-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.session-heading p { margin: 0 0 6px; color: var(--red); font-size: 11px; font-weight: 900; letter-spacing: .15em; }
.session-heading h2 { margin: 0; font-family: var(--kai); font-size: 34px; letter-spacing: .04em; }
.session-count { text-align: right; }
.session-count strong, .session-count span { display: block; }
.session-count strong { color: var(--green); font-size: 18px; }
.session-count span { margin-top: 3px; color: var(--muted); font-size: 10px; }
.session-track { height: 5px; margin-bottom: 14px; overflow: hidden; background: rgba(65,74,61,.12); border-radius: 999px; }
.session-track span { display: block; width: 0; height: 100%; background: linear-gradient(90deg,var(--red),var(--gold)); transition: width .25s ease; }

.review-stage { min-height: 570px; }
.review-card, .session-finish { min-height: 570px; padding: clamp(26px,5vw,52px); background: var(--surface); border: 1px solid var(--line); border-radius: 28px 28px 28px 7px; box-shadow: var(--shadow); backdrop-filter: blur(14px); }
.card-meta { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.card-meta > span { padding: 7px 10px; color: var(--green); background: rgba(63,105,81,.08); border: 1px solid rgba(63,105,81,.17); border-radius: 8px; font-size: 11px; font-weight: 900; }
.card-meta small { color: var(--muted); }
.card-level { margin: 42px 0 12px; color: var(--gold); font-size: 11px; font-weight: 900; letter-spacing: .14em; }
.review-card h3 { max-width: 720px; min-height: 96px; margin: 0 0 34px; font-family: var(--song); font-size: clamp(27px,4vw,39px); font-weight: 700; line-height: 1.45; }
#answer-form label { display: block; margin-bottom: 9px; color: var(--muted); font-size: 12px; }
.answer-row { display: grid; grid-template-columns: 1fr auto; gap: 9px; }
.answer-row input { min-width: 0; min-height: 54px; padding: 0 16px; color: var(--ink); background: rgba(255,255,255,.55); border: 1px solid var(--line); border-radius: 13px; outline: none; }
.answer-row input:focus { border-color: var(--red); box-shadow: 0 0 0 4px rgba(163,60,47,.08); }
.answer-row button { min-height: 54px; padding: 0 20px; color: #fff9eb; background: var(--ink); border: 0; border-radius: 13px; cursor: pointer; font-weight: 900; }
.answer-row button:hover { background: var(--red); }
.answer-reveal { margin-top: 26px; padding-top: 22px; border-top: 1px solid var(--line); }
.answer-verdict { margin: 0 0 15px; font-weight: 900; }
.answer-verdict.correct { color: var(--green); }
.answer-verdict.wrong { color: var(--red); }
.correct-answer { display: flex; align-items: baseline; gap: 12px; }
.correct-answer span { color: var(--muted); font-size: 11px; }
.correct-answer strong { font-family: var(--kai); font-size: 27px; }
.answer-explanation { margin: 12px 0 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.rating-panel { margin-top: 23px; padding-top: 21px; border-top: 1px solid var(--line); }
.rating-panel > p { margin: 0 0 11px; color: var(--muted); font-size: 12px; }
.rating-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 8px; }
.rating-grid button { min-height: 68px; padding: 10px; color: var(--ink); background: rgba(255,255,255,.45); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; }
.rating-grid button:hover { border-color: var(--red); transform: translateY(-2px); }
.rating-grid strong, .rating-grid span { display: block; }
.rating-grid strong { font-size: 13px; }
.rating-grid span { margin-top: 5px; color: var(--muted); font-size: 10px; }
.rating-grid button[data-rating="1"]:hover { color: var(--red); }
.rating-grid button[data-rating="3"]:hover, .rating-grid button[data-rating="4"]:hover { color: var(--green); border-color: var(--green); }

.session-finish { display: grid; place-items: center; align-content: center; text-align: center; }
.finish-seal { display: grid; width: 68px; height: 68px; place-items: center; color: #fff8e9; background: var(--red); border-radius: 18px 18px 18px 5px; font-family: var(--kai); font-size: 30px; }
.finish-kicker { margin: 20px 0 7px; color: var(--gold); font-size: 11px; font-weight: 900; letter-spacing: .15em; }
.session-finish h3 { margin: 0; font-family: var(--kai); font-size: 34px; }
.session-finish > p:last-of-type { max-width: 530px; margin: 12px 0 20px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.session-finish button, .session-finish a { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; margin: 4px; padding: 0 17px; border-radius: 11px; font-size: 12px; font-weight: 900; }
.session-finish button { color: white; background: var(--green); border: 0; cursor: pointer; }
.session-finish a { color: var(--ink); text-decoration: none; background: transparent; border: 1px solid var(--line); }

.review-sidebar { display: grid; gap: 14px; }
.memory-model, .coverage-card, .privacy-card { padding: 22px; background: rgba(255,252,243,.64); border: 1px solid var(--line); border-radius: 20px 20px 20px 6px; }
.side-kicker { margin: 0 0 7px; color: var(--red); font-size: 10px; font-weight: 900; letter-spacing: .15em; }
.memory-model h2 { margin: 0 0 17px; font-family: var(--kai); font-size: 23px; }
.model-list { display: grid; gap: 8px; }
.model-list > div { display: grid; grid-template-columns: 39px 1fr; gap: 11px; align-items: center; padding: 11px; background: rgba(255,255,255,.42); border-radius: 11px; }
.model-list > div > span { display: grid; width: 39px; height: 39px; place-items: center; color: var(--green); background: rgba(63,105,81,.09); border-radius: 9px; font-family: var(--numeral); font-weight: 900; }
.model-list p { margin: 0; }
.model-list strong, .model-list small { display: block; }
.model-list strong { font-size: 11px; }
.model-list small { margin-top: 4px; color: var(--muted); font-size: 10px; }
.model-note { margin: 17px 0 0; color: var(--muted); font-size: 11px; line-height: 1.75; }
.coverage-heading { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.coverage-heading .side-kicker { margin: 0; }
.coverage-heading > span { color: var(--green); font-size: 11px; font-weight: 900; }
.coverage-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 6px; margin-top: 14px; }
.coverage-item { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 32px; padding: 0 9px; color: var(--muted); background: rgba(255,255,255,.40); border-radius: 8px; font-size: 10px; }
.coverage-item strong { color: var(--ink); font-size: 10px; }
.privacy-card { display: grid; grid-template-columns: 42px 1fr; gap: 12px; align-items: center; }
.privacy-card > span { display: grid; width: 42px; height: 42px; place-items: center; color: #fff8e9; background: var(--green); border-radius: 11px 11px 11px 3px; font-family: var(--kai); font-size: 21px; }
.privacy-card p { margin: 0; }
.privacy-card strong, .privacy-card small { display: block; }
.privacy-card strong { font-size: 12px; }
.privacy-card small { margin-top: 4px; color: var(--muted); font-size: 10px; line-height: 1.6; }

.page-footer { display: flex; justify-content: space-between; gap: 20px; padding: 25px 0 76px; color: var(--muted); border-top: 1px solid var(--line); font-size: 10px; }
.page-footer p { margin: 0; }
.noscript { margin: 20px; padding: 16px; color: white; background: var(--red); text-align: center; }
[hidden] { display: none !important; }
:where(a,button,input):focus-visible { outline: 3px solid rgba(163,60,47,.35); outline-offset: 3px; }

@media (max-width: 960px) {
  .hero-layout { grid-template-columns: 1fr; gap: 34px; }
  .hero-stats { max-width: 650px; grid-template-columns: repeat(4,1fr); }
  .hero-stats div { min-height: 94px; padding: 15px; }
  .review-layout { grid-template-columns: 1fr; }
  .review-sidebar { grid-template-columns: repeat(2,1fr); }
  .privacy-card { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .wrap { width: min(100% - 24px,1180px); }
  .review-hero { padding-top: 18px; }
  .export-btn { min-width: 40px; width: 40px; padding: 0; overflow: hidden; font-size: 0; }
  .export-btn::before { content: "备"; font-size: 15px; }
  .hero-layout { margin-top: 42px; }
  h1 { font-size: clamp(48px,16vw,70px); }
  .hero-copy > p:last-child { font-size: 14px; }
  .hero-stats { grid-template-columns: repeat(2,1fr); }
  .review-layout { padding-top: 38px; }
  .session-heading h2 { font-size: 27px; }
  .review-card, .session-finish { min-height: 540px; padding: 25px 19px; }
  .review-card h3 { min-height: auto; margin-bottom: 28px; font-size: 27px; }
  .answer-row { grid-template-columns: 1fr; }
  .rating-grid { grid-template-columns: repeat(2,1fr); }
  .review-sidebar { grid-template-columns: 1fr; }
  .privacy-card { grid-column: auto; }
  .page-footer { flex-direction: column; gap: 5px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}

/* assets/site-shell.css */
/* The shared dock is independent of each subject's colors and navigation styles. */
body[data-knowledge-theme] { min-width: 0; }

body .site-knowledge-dock {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 8;
  display: flex;
  align-items: center;
  gap: 5px;
  max-width: calc(100vw - 24px);
  margin: 0;
  padding: 5px;
  color: #f9f8f2;
  background: #173c32;
  border: 1px solid #386053;
  border-radius: 15px;
  box-shadow: 0 8px 28px rgba(19, 43, 34, .19);
  font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.4;
}
body .site-knowledge-dock a {
  position: static;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 44px;
  padding: 0 12px;
  color: #f9f8f2;
  background: transparent;
  border: 0;
  border-radius: 10px;
  text-decoration: none;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0;
  box-shadow: none;
  transition: background-color 160ms ease;
}
body .site-knowledge-dock .site-review-link { color: #e2eee5; background: rgba(255, 255, 255, .08); }
body .site-knowledge-dock a:hover,
body .site-knowledge-dock a[aria-current="page"] { color: #fff; background: rgba(255, 255, 255, .17); }
body .site-knowledge-dock .site-dock-icon { display: inline-block; font-size: 18px; line-height: 1; }
body .site-knowledge-dock a:focus-visible { outline: 2px solid #fff3c7; outline-offset: -2px; }
body .site-dock-spacer {
  display: block;
  clear: both;
  height: calc(88px + env(safe-area-inset-bottom));
  flex: 0 0 calc(88px + env(safe-area-inset-bottom));
  pointer-events: none;
}
@media (max-width: 560px) {
  body .site-knowledge-dock { right: 12px; bottom: max(12px, env(safe-area-inset-bottom)); border-radius: 13px; }
  body .site-knowledge-dock a { gap: 5px; padding: 0 10px; font-size: 12px; }
}
@media print { body .site-knowledge-dock, body .site-dock-spacer { display: none; } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }
}

/* assets/knowledge-theme.css */
/* Shared reading theme. Semantic red/green and illustration colors stay local. */
body[data-knowledge-theme="light"] {
  --knowledge-green: #245345;
  --knowledge-green-soft: #e8efe8;
  --knowledge-paper: #f7f6ef;
  --knowledge-surface: #fffef9;
  --knowledge-line: #dce2d8;
  --paper: var(--knowledge-paper);
  --paper-deep: #e9ecdf;
  --card: var(--knowledge-surface);
  --panel: var(--knowledge-surface);
  --sheet: var(--knowledge-surface);
  --ink: #203c32;
  --dim: #606c62;
  --muted: #606c62;
  --line: var(--knowledge-line);
  --line-soft: #e8ece3;
  --accent: var(--knowledge-green);
  --shadow: 0 8px 26px rgba(35, 61, 43, .045);
  --bs-paper: var(--knowledge-paper);
  --bs-sheet: var(--knowledge-surface);
  --bs-ink: #203c32;
  --bs-muted: #606c62;
  --bs-line: var(--knowledge-line);
  color-scheme: light;
  color: var(--ink);
  background: var(--knowledge-paper);
  background-attachment: scroll;
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-knowledge-theme="light"] ::selection {
  color: #fffef9;
  background: var(--knowledge-green);
}

body[data-knowledge-theme="light"] :where(h1, h2, h3) {
  text-wrap: pretty;
}

body[data-knowledge-theme="light"] > header:not(.topic-hero):not(.series-bar) h1 {
  letter-spacing: .05em;
}

body[data-knowledge-theme="light"] > header:not(.topic-hero):not(.series-bar) h1::after {
  background: var(--knowledge-green);
  opacity: .4;
}

body[data-knowledge-theme="light"] :where(.card:not(.mastered):not(.right):not(.wrong):not(.correct):not(.incorrect), .panel, .info-card,
  .module-card, .progress-panel, .reader, .side-panel, .map-card, .story-card,
  .fc, .q-body, .verse, .fc-face, .quiz-card, .quiz-finish, .dialog) {
  border-radius: 15px;
  background: var(--knowledge-surface);
  box-shadow: 0 5px 22px rgba(35, 61, 43, .045);
}

body[data-knowledge-theme="light"] .card:not(.mastered):not(.right):not(.wrong):not(.correct):not(.incorrect):hover {
  border-color: #9ab5a1;
  box-shadow: 0 8px 26px rgba(35, 61, 43, .075);
  transform: translateY(-2px);
}

body[data-knowledge-theme="light"] :where(.course-nav, .study-nav, .series-bar) {
  background: rgba(247, 246, 239, .96);
  border-color: var(--knowledge-line);
}

body[data-knowledge-theme="light"] nav button,
body[data-knowledge-theme="light"] #pages button {
  border-radius: 10px;
  font-family: inherit;
  letter-spacing: 0;
}

body[data-knowledge-theme="light"] nav button:is(.on, .is-active),
body[data-knowledge-theme="light"] #pages button.on,
body[data-knowledge-theme="light"] .series-bar__nav a[aria-current="page"] {
  color: #fffef9;
  background: var(--knowledge-green);
  border-color: var(--knowledge-green);
  box-shadow: none;
}

body[data-knowledge-theme="light"] nav button:hover:not(.on):not(.is-active),
body[data-knowledge-theme="light"] #pages button:hover:not(.on) {
  color: var(--knowledge-green);
  background: var(--knowledge-green-soft);
  border-color: #b5c8b9;
}

body[data-knowledge-theme="light"] :where(.chapter-btn.is-active, button.chip.on) {
  color: var(--knowledge-green);
  background: var(--knowledge-green-soft);
  border-color: #b5c8b9;
}

body[data-knowledge-theme="light"] :where(.toolbar input, .search input,
  input[type="text"], input[type="search"], textarea):not([type="checkbox"]):not([type="radio"]) {
  background: var(--knowledge-surface);
  border-color: var(--knowledge-line);
  border-radius: 10px;
}

body[data-knowledge-theme="light"] :where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 3px solid #85ab8f;
  outline-offset: 3px;
}

/* Keep the shared dock's focus contrast against its dark background. */
body[data-knowledge-theme="light"] .site-knowledge-dock a:focus-visible {
  outline: 2px solid #fff3c7;
  outline-offset: -2px;
}

/* Review Center has a light reading surface; leave verdicts and ratings semantic. */
body[data-knowledge-theme="light"] :where(.review-card, .session-finish,
  .memory-model, .coverage-card, .privacy-card) {
  background: var(--knowledge-surface);
  border-color: var(--knowledge-line);
  border-radius: 15px;
  box-shadow: 0 5px 22px rgba(35, 61, 43, .045);
}

body[data-knowledge-theme="light"] .review-hero .hero-stats {
  border-radius: 15px;
  box-shadow: 0 5px 22px rgba(35, 61, 43, .045);
}

body[data-knowledge-theme="light"] .review-hero .hero-stats div {
  background: var(--knowledge-surface);
}

body[data-knowledge-theme="light"] .review-hero :where(.brand, h1),
body[data-knowledge-theme="light"] .review-layout :where(.session-heading h2, .memory-model h2) {
  font-family: inherit;
}

body[data-knowledge-theme="light"] .review-hero h1 em,
body[data-knowledge-theme="light"] .review-layout .side-kicker,
body[data-knowledge-theme="light"] .review-layout .session-heading p {
  color: var(--knowledge-green);
}

body[data-knowledge-theme="light"] .review-hero .brand > span {
  background: var(--knowledge-green);
  border-radius: 10px;
}

body[data-knowledge-theme="light"] .review-layout .session-track span {
  background: var(--knowledge-green);
}

/* Let the bit table scroll within its lesson column instead of widening the page. */
body[data-knowledge-theme="light"].binary-series .lesson-grid > * {
  min-width: 0;
}

@media (max-width: 800px) {
  body[data-knowledge-theme="light"].binary-series .lesson-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 420px) {
  body[data-knowledge-theme="light"] #xunList {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  body[data-knowledge-theme="light"] > header:not(.topic-hero):not(.series-bar) h1 {
    letter-spacing: .03em;
  }
}