/* 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;
  }
}

/* binary-practice/series.css */
:root {
  --bs-paper: #f3ecdc;
  --bs-sheet: rgba(255, 252, 244, .94);
  --bs-ink: #17231e;
  --bs-muted: #667069;
  --bs-line: rgba(23, 35, 30, .14);
  --bs-jade: #1f6654;
  --bs-jade-soft: #dcece5;
  --bs-red: #a33b2d;
  --bs-gold: #a57c2d;
  --bs-code: #10251e;
}

body.binary-series {
  min-height: 100vh;
  color: var(--bs-ink);
  background:
    radial-gradient(circle at 15% 5%, rgba(165, 124, 45, .12), transparent 28rem),
    radial-gradient(circle at 90% 22%, rgba(31, 102, 84, .11), transparent 30rem),
    linear-gradient(180deg, #f8f3e8 0%, var(--bs-paper) 100%);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Microsoft YaHei", serif;
}

.binary-series *, .binary-series *::before, .binary-series *::after { box-sizing: border-box; }
.binary-series a { color: inherit; }
.binary-series button, .binary-series input, .binary-series select, .binary-series textarea { font: inherit; }
.binary-series code, .binary-series .mono { font-family: "Cascadia Code", Consolas, monospace; }

.series-bar {
  position: sticky;
  z-index: 30;
  top: 0;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px max(16px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid var(--bs-line);
  background: rgba(248, 243, 232, .9);
  backdrop-filter: blur(16px);
}
.series-bar__home, .series-bar__nav a {
  text-decoration: none;
  white-space: nowrap;
}
.series-bar__home { font-weight: 800; letter-spacing: .08em; }
.series-bar__nav { display: flex; gap: 5px; overflow-x: auto; scrollbar-width: none; }
.series-bar__nav::-webkit-scrollbar { display: none; }
.series-bar__nav a {
  padding: 7px 10px;
  border-radius: 999px;
  color: var(--bs-muted);
  font-size: 13px;
}
.series-bar__nav a:hover, .series-bar__nav a[aria-current="page"] { background: var(--bs-ink); color: #fffaf0; }
.series-bar__progress { margin-left: auto; color: var(--bs-jade); font-size: 13px; white-space: nowrap; }

.series-hero, .series-main { width: min(1120px, calc(100% - 32px)); margin-inline: auto; }
.series-hero { padding: clamp(52px, 8vw, 100px) 0 38px; }
.series-eyebrow { margin: 0 0 14px; color: var(--bs-red); font-size: 13px; font-weight: 800; letter-spacing: .22em; text-transform: uppercase; }
.series-hero h1 { max-width: 900px; margin: 0; font-size: clamp(36px, 7vw, 76px); line-height: 1.08; letter-spacing: -.04em; }
.series-hero h1 span { color: var(--bs-jade); }
.series-lead { max-width: 760px; margin: 22px 0 0; color: var(--bs-muted); font-size: clamp(16px, 2vw, 20px); line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.primary-btn, .secondary-btn, .complete-btn, .key-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--bs-ink);
  border-radius: 999px;
  cursor: pointer;
  text-decoration: none;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.primary-btn, .complete-btn { background: var(--bs-ink); color: #fffaf0; }
.secondary-btn { background: transparent; color: var(--bs-ink); }
.primary-btn:hover, .secondary-btn:hover, .complete-btn:hover, .key-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(23, 35, 30, .12); }
.complete-btn.is-complete { border-color: var(--bs-jade); background: var(--bs-jade); }

.series-main { padding-bottom: 80px; }
.series-section { margin-top: 34px; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 18px; }
.section-heading h2 { margin: 0; font-size: clamp(24px, 4vw, 38px); }
.section-heading p { margin: 0; color: var(--bs-muted); }

.progress-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 20px;
  border: 1px solid var(--bs-line);
  border-radius: 18px;
  background: var(--bs-sheet);
  box-shadow: 0 14px 50px rgba(23, 35, 30, .06);
}
.progress-track { height: 10px; overflow: hidden; border-radius: 999px; background: rgba(23, 35, 30, .08); }
.progress-fill { width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--bs-jade), #49a085); transition: width .5s ease; }
.progress-copy strong { display: block; margin-bottom: 8px; font-size: 18px; }
.progress-copy span { color: var(--bs-muted); font-size: 14px; }
.progress-number { color: var(--bs-jade); font: 800 28px/1 "Cascadia Code", monospace; }

.module-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.module-card {
  position: relative;
  min-height: 250px;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--bs-line);
  border-radius: 20px;
  background: var(--bs-sheet);
  box-shadow: 0 14px 40px rgba(23, 35, 30, .055);
}
.module-card::after { content: attr(data-number); position: absolute; right: 18px; bottom: -18px; color: rgba(31, 102, 84, .08); font: 900 96px/1 "Cascadia Code", monospace; }
.module-card.is-complete { border-color: rgba(31, 102, 84, .55); box-shadow: inset 0 0 0 1px rgba(31, 102, 84, .2); }
.module-card__meta { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--bs-muted); font-size: 13px; }
.module-card__status { color: var(--bs-red); }
.module-card.is-complete .module-card__status { color: var(--bs-jade); }
.module-card h3 { margin: 28px 0 10px; font-size: 26px; }
.module-card p { max-width: 500px; margin: 0 0 24px; color: var(--bs-muted); line-height: 1.8; }
.module-card a { position: relative; z-index: 1; color: var(--bs-jade); font-weight: 800; text-decoration: none; }

.lesson-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); gap: 16px; align-items: start; }
.panel {
  padding: clamp(18px, 3vw, 28px);
  border: 1px solid var(--bs-line);
  border-radius: 18px;
  background: var(--bs-sheet);
  box-shadow: 0 14px 45px rgba(23, 35, 30, .05);
}
.panel + .panel { margin-top: 14px; }
.panel h2, .panel h3 { margin-top: 0; }
.panel p, .panel li { color: var(--bs-muted); line-height: 1.85; }
.formula { padding: 14px 16px; overflow-x: auto; border-left: 4px solid var(--bs-jade); background: var(--bs-jade-soft); font: 700 16px/1.7 "Cascadia Code", monospace; }
.callout { padding: 14px 16px; border-radius: 12px; background: rgba(165, 124, 45, .12); line-height: 1.8; }
.control-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.field { display: grid; gap: 6px; }
.field label { color: var(--bs-muted); font-size: 13px; }
.field input, .field select, .field textarea {
  width: 100%; min-height: 44px; padding: 9px 11px; border: 1px solid var(--bs-line); border-radius: 10px; background: #fffdf8; color: var(--bs-ink); outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--bs-jade); box-shadow: 0 0 0 3px rgba(31, 102, 84, .1); }
.field.full { grid-column: 1 / -1; }
.button-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

.bit-table { display: grid; gap: 7px; margin-top: 16px; overflow-x: auto; }
.bit-row { display: grid; grid-template-columns: 74px repeat(var(--bits, 8), minmax(34px, 1fr)); gap: 5px; min-width: 430px; align-items: center; }
.bit-row__label { color: var(--bs-muted); font-size: 12px; }
.bit-cell { display: grid; place-items: center; min-height: 40px; border: 1px solid var(--bs-line); border-radius: 8px; background: #fffdf8; font: 700 16px/1 "Cascadia Code", monospace; }
.bit-cell.is-one { border-color: rgba(31, 102, 84, .34); background: var(--bs-jade-soft); color: var(--bs-jade); }
.bit-cell.is-carry { border-color: rgba(163, 59, 45, .35); background: #f5e4df; color: var(--bs-red); }
.result-box { margin-top: 16px; padding: 18px; border-radius: 14px; background: var(--bs-code); color: #ecf8f2; }
.result-box strong { color: #87d4bc; }
.result-box .big-result { display: block; margin: 8px 0; font: 800 clamp(24px, 5vw, 42px)/1.25 "Cascadia Code", monospace; overflow-wrap: anywhere; }
.step-list { margin: 12px 0 0; padding-left: 20px; }
.step-list li { color: #c7dbd2; }
.warning { color: #ffb09d !important; }

.pipeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 18px; }
.pipeline div { position: relative; padding: 16px 8px; border: 1px solid var(--bs-line); border-radius: 12px; background: #fffdf8; text-align: center; }
.pipeline div:not(:last-child)::after { content: "→"; position: absolute; right: -12px; z-index: 2; color: var(--bs-red); }

.quiz-card { padding: 22px; border: 1px solid var(--bs-line); border-radius: 16px; background: #fffdf8; }
.quiz-card__meta { display: flex; justify-content: space-between; color: var(--bs-muted); font-size: 13px; }
.quiz-card h3 { margin: 18px 0; line-height: 1.6; }
.quiz-options { display: grid; gap: 8px; }
.quiz-option { min-height: 44px; padding: 10px 12px; border: 1px solid var(--bs-line); border-radius: 10px; background: transparent; color: var(--bs-ink); cursor: pointer; text-align: left; }
.quiz-option:hover { border-color: var(--bs-jade); }
.quiz-option.correct { border-color: var(--bs-jade); background: var(--bs-jade-soft); }
.quiz-option.wrong { border-color: var(--bs-red); background: #f5e4df; }
.quiz-feedback { min-height: 52px; margin-top: 12px; color: var(--bs-muted); line-height: 1.7; }
.quiz-feedback strong { color: var(--bs-ink); }

.calculator-shell { overflow: hidden; border: 1px solid var(--bs-line); border-radius: 22px; background: #15251f; box-shadow: 0 24px 70px rgba(12, 32, 25, .2); }
.calc-display { padding: 24px; border-bottom: 1px solid rgba(255,255,255,.1); color: #effbf5; }
.calc-expression { min-height: 24px; color: #9db5aa; text-align: right; }
.calc-decimal { display: block; margin: 8px 0; font: 800 clamp(34px, 8vw, 60px)/1.1 "Cascadia Code", monospace; text-align: right; overflow-x: auto; }
.calc-binary, .calc-hex { display: block; color: #7fd0b4; font: 14px/1.8 "Cascadia Code", monospace; text-align: right; overflow-x: auto; }
.calc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: rgba(255,255,255,.08); }
.key-btn { min-height: 58px; border: 0; border-radius: 0; background: #20352d; color: #effbf5; font: 700 18px/1 "Cascadia Code", monospace; }
.key-btn.op { background: #285747; color: #a9eed5; }
.key-btn.equal { background: var(--bs-red); color: #fff; }
.alu-log { max-height: 310px; margin: 0; padding: 18px 22px 18px 42px; overflow-y: auto; background: #0f1d18; color: #b9d0c6; font: 13px/1.8 "Cascadia Code", monospace; }

.next-panel { display: flex; justify-content: space-between; gap: 18px; align-items: center; margin-top: 24px; }
.source-list a { color: var(--bs-jade); }
.source-list li { margin-bottom: 8px; }

@media (max-width: 800px) {
  .series-bar__progress { display: none; }
  .module-grid, .lesson-grid { grid-template-columns: 1fr; }
  .pipeline { grid-template-columns: 1fr; }
  .pipeline div:not(:last-child)::after { content: "↓"; inset: auto auto -14px 50%; }
}
@media (max-width: 560px) {
  .series-hero, .series-main { width: min(100% - 22px, 1120px); }
  .series-bar { padding-inline: 10px; }
  .series-bar__home { font-size: 13px; }
  .control-grid { grid-template-columns: 1fr; }
  .module-card { min-height: 230px; }
  .next-panel { align-items: stretch; flex-direction: column; }
}

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