@font-face {
  font-family: "CXP Serif SC";
  src: url("assets/fonts/NotoSerifSC-Variable.ttf") format("truetype");
  font-weight: 200 900;
  font-style: normal;
  font-display: swap;
}
:root {
  --song: "CXP Serif SC","Noto Serif SC",serif;
  --paper: #f5f1e7;
  --paper-deep: #ebe5d7;
  --ink: #202d29;
  --muted: #68736d;
  --pine: #315f52;
  --pine-dark: #203f36;
  --cinnabar: #a33a2b;
  --line: rgba(39, 61, 53, .18);
  --kai: var(--song);
  --serif: var(--song);
  --sans: var(--song);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
button { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid #b75a37; outline-offset: 4px; }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: -80px; left: 15px; z-index: 20; padding: 9px 16px; background: var(--ink); color: white; }
.skip-link:focus { top: 10px; }
.site-header { height: 76px; padding: 0 clamp(20px, 5vw, 72px); display: flex; align-items: center; gap: 34px; border-bottom: 1px solid var(--line); background: rgba(245,241,231,.96); position: sticky; top: 0; z-index: 10; backdrop-filter: blur(12px); }
.wordmark { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 14px; font-weight: 650; letter-spacing: -.02em; white-space: nowrap; }
.wordmark > span:last-child > span { color: var(--cinnabar); }
.seal { display: grid; place-items: center; width: 31px; height: 31px; background: var(--cinnabar); color: #fff8e9; font-family: var(--serif); font-size: 20px; line-height: 1; border-radius: 2px; transform: rotate(-2deg); }
.nav { display: flex; align-items: center; gap: 27px; margin-left: auto; }
.nav a, .nav span { font-size: 12px; text-decoration: none; color: #485a52; }
.nav a:hover { color: var(--cinnabar); }
.nav .nav-disabled { color: #99a098; cursor: default; }
.free-note { color: var(--muted); font-size: 10px; letter-spacing: .09em; text-transform: uppercase; }
.button { min-height: 42px; border: 0; border-radius: 2px; padding: 10px 18px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; background: var(--pine); color: white; text-decoration: none; font-size: 12px; font-weight: 650; cursor: pointer; }
.button:hover:not(:disabled) { background: var(--pine-dark); }
.button-secondary { background: transparent; color: var(--pine); border: 1px solid rgba(49,95,82,.35); }
.button-secondary:hover:not(:disabled) { background: rgba(49,95,82,.07); }
.button:disabled { opacity: .48; cursor: not-allowed; }
.text-link { color: var(--pine); font-size: 12px; font-weight: 650; text-underline-offset: 4px; }
.eyebrow, .section-label { text-transform: uppercase; letter-spacing: .17em; font-size: 10px; font-weight: 700; color: var(--cinnabar); }
.quiet { color: var(--muted); }

/* Sample entrance */
.samples-hero { position: relative; overflow: hidden; padding: 72px clamp(25px, 8vw, 120px) 68px; border-bottom: 1px solid var(--line); }
.samples-hero::after, .detail-intro::after { content: ""; position: absolute; inset: auto 0 0; height: 65%; pointer-events: none; opacity: .7; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 300'%3E%3Cpath d='M0 260c110-20 140-100 230-70 65 22 82-74 153-57 63 15 72 96 144 79 83-19 105-105 181-86 67 17 74 100 149 96 88-5 131-68 206-37 63 26 82 61 137 50v65H0Z' fill='%23315f52' opacity='.08'/%3E%3Cpath d='M0 275c170-20 232-62 349-40 104 19 170-35 264-17 106 21 177 48 292 19 103-29 188-18 295-4' fill='none' stroke='%23315f52' opacity='.18'/%3E%3C/svg%3E") center bottom/cover no-repeat; }
.hero-copy { position: relative; z-index: 1; max-width: 760px; }
.hero-copy h1 { margin: 14px 0 20px; font-family: var(--song); font-weight: 400; font-size: clamp(42px, 5.3vw, 70px); line-height: 1.06; letter-spacing: -.04em; }
.hero-copy h1 em { color: var(--pine); font-weight: 400; }
.hero-copy p:not(.eyebrow) { max-width: 580px; color: #53635b; font-size: 15px; }
.sample-list { padding: 55px clamp(24px, 8vw, 120px) 85px; display: grid; gap: 0; }
.sample-row { display: grid; grid-template-columns: 60px 120px minmax(0,1fr) auto; align-items: center; gap: 28px; padding: 27px 0; border-bottom: 1px solid var(--line); text-decoration: none; }
.sample-row:first-child { border-top: 1px solid var(--line); }
.sample-row:hover .sample-glyph { color: var(--cinnabar); transform: translateY(-2px); }
.sample-number { font-family: var(--song); color: #91988f; font-size: 14px; }
.sample-glyph { font-family: var(--song); font-size: 68px; line-height: 1; transition: .2s; }
.sample-row h2 { font-family: var(--song); font-weight: 400; font-size: 26px; margin: 0 0 5px; }
.sample-row p { margin: 0; color: var(--muted); font-size: 12px; }
.sample-category { color: var(--pine); text-transform: uppercase; letter-spacing: .13em; font-size: 9px; font-weight: 700; }
.sample-arrow { color: var(--pine); font-size: 22px; }

/* Shared detail pages */
.detail-intro { position: relative; overflow: hidden; padding: 35px clamp(24px, 6vw, 90px) 50px; border-bottom: 1px solid var(--line); }
.breadcrumbs { position: relative; z-index: 2; display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: 10px; margin-bottom: 30px; }
.breadcrumbs a { color: var(--pine); text-underline-offset: 3px; }
.page-tabs { position: relative; z-index: 2; display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 42px; }
.page-tabs a { padding: 6px 12px; border: 1px solid var(--line); border-radius: 20px; text-decoration: none; color: var(--muted); font-size: 10px; }
.page-tabs a[aria-current="page"] { border-color: var(--pine); color: var(--pine); background: rgba(49,95,82,.06); }
.detail-heading { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0,1fr) auto; gap: 40px; align-items: end; }
.category-line { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.category-chip { color: var(--pine); border: 1px solid rgba(49,95,82,.3); border-radius: 20px; padding: 3px 10px; font-size: 9px; letter-spacing: .06em; }
.category-chip.rare { color: var(--cinnabar); border-color: rgba(163,58,43,.35); }
.detail-heading h1 { display: flex; align-items: baseline; gap: 20px; margin: 12px 0 8px; font-weight: 400; }
.title-glyph { font-family: var(--song); font-size: clamp(72px, 8vw, 108px); line-height: 1; }
.title-pinyin { font-family: var(--song); color: var(--pine); font-size: clamp(31px, 4vw, 47px); }
.title-meaning { font-family: var(--song); font-size: 24px; margin: 0 0 10px; }
.title-subtitle { color: var(--muted); max-width: 610px; font-size: 13px; margin: 0; }
.level-badge { display: inline-flex; align-items: center; gap: 7px; margin-top: 18px; color: #5e6d64; font-size: 10px; }
.level-badge::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--pine); }
.level-badge.extension::before { background: var(--cinnabar); }
.heading-note { max-width: 260px; padding-left: 22px; border-left: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.heading-note strong { display: block; color: var(--ink); font-family: var(--song); font-size: 19px; font-weight: 400; margin-bottom: 5px; }
.detail-grid { padding: 55px clamp(24px, 6vw, 90px) 75px; display: grid; grid-template-columns: minmax(0,1.35fr) minmax(280px,.65fr); gap: clamp(35px,5vw,72px); }
.learning-stage { min-width: 0; }
.stage-heading { display: flex; align-items: start; justify-content: space-between; gap: 18px; margin-bottom: 20px; }
.stage-heading h2, .content-section h2 { font-family: var(--song); font-weight: 400; font-size: 28px; margin: 0 0 5px; }
.stage-heading p, .content-section > p { color: var(--muted); font-size: 11px; margin: 0; }
.character-canvas { min-height: 330px; display: grid; place-items: center; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); position: relative; background: rgba(255,255,255,.12); }
.character-canvas::before { content: ""; position: absolute; inset: 22px; border: 1px solid rgba(49,95,82,.07); pointer-events: none; }
.large-glyph { font-family: var(--song); font-size: clamp(130px,17vw,210px); line-height: 1; }
.canvas-caption { position: absolute; bottom: 15px; color: #828b84; font-size: 9px; letter-spacing: .12em; text-transform: uppercase; }
.stage-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 13px; margin-top: 20px; }
.voice-status, .interaction-status { color: var(--muted); font-size: 10px; margin: 12px 0 0; }
.interaction-status { min-height: 34px; color: #52655b; }
.clue-panel { border-left: 2px solid var(--pine); padding-left: 20px; }
.clue-panel h3 { font-family: var(--song); font-size: 22px; font-weight: 400; margin: 7px 0 10px; }
.clue-panel p { color: var(--muted); font-size: 12px; }
.clue-panel .clue-glyph { font-family: var(--song); color: var(--cinnabar); font-size: 48px; line-height: 1; }
.content-section { margin-top: 52px; }
.info-rail { min-width: 0; }
.info-block { border-top: 1px solid var(--line); padding: 20px 0 24px; }
.info-block:first-child { padding-top: 0; border-top: 0; }
.info-block h2 { font-family: var(--song); font-size: 20px; font-weight: 400; margin: 0 0 10px; }
.info-block p { color: var(--muted); font-size: 11px; margin: 0 0 8px; }
.info-block a { color: var(--pine); }
.sources { margin-top: 25px; border-top: 1px solid var(--line); padding-top: 17px; }
.sources summary { cursor: pointer; color: var(--pine); font-size: 11px; }
.sources ul { padding-left: 18px; }
.sources li { color: var(--muted); font-size: 10px; margin: 8px 0; overflow-wrap: anywhere; }
.sources a { color: var(--pine); }
.page-footer { border-top: 1px solid var(--line); padding: 27px clamp(24px,6vw,90px); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.page-footer p { color: var(--muted); font-size: 10px; margin: 0; }
.next-links { display: flex; gap: 18px; }
.next-links a { color: var(--pine); font-size: 11px; }

/* Water */
#water-recall { width: min(480px, calc(100vw - 32px)); padding: 0; border: 0; background: transparent; color: var(--ink); }
#water-recall::backdrop { background: var(--paper); }
body.recall-open { overflow: hidden; }
.recall-card { border: 1px solid var(--line); background: var(--paper); padding: 34px 32px 30px; text-align: center; box-shadow: 0 20px 70px rgba(32,45,41,.08); }
.recall-card-glyph { display: block; font-family: var(--song); font-size: 125px; line-height: 1.05; }
.recall-card-pinyin { display: block; color: var(--pine); font-family: var(--song); font-size: 30px; }
.recall-card h2 { font-family: var(--song); font-weight: 400; font-size: 23px; margin: 18px 0; }
.recall-card-answer { font-family: var(--song); font-size: 30px; margin: 15px 0; }
.recall-card-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.recall-row { display: flex; align-items: center; gap: 20px; margin-top: 22px; }
.recall-meaning { font-family: var(--song); font-size: 23px; margin: 0; }
.variant-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.variant-button { border: 1px solid var(--line); background: transparent; color: var(--ink); padding: 18px; display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 15px; text-align: left; cursor: pointer; }
.variant-button[aria-pressed="true"] { border-color: var(--pine); background: rgba(49,95,82,.06); }
.variant-glyph { font-family: var(--song); font-size: 48px; line-height: 1; }
.variant-button strong { display: block; font-size: 12px; }
.variant-button small { color: var(--muted); font-size: 10px; }
.example-list { display: grid; gap: 8px; margin-top: 18px; }
.example-item { display: grid; grid-template-columns: 42px 85px 1fr auto; align-items: center; gap: 12px; border-bottom: 1px solid var(--line); padding: 12px 0; }
.example-item button { border: 0; background: transparent; color: var(--pine); text-align: left; padding: 6px; cursor: pointer; font-size: 11px; text-decoration: underline; text-underline-offset: 3px; }
.example-hanzi { font-family: var(--song); font-size: 31px; }
.example-pinyin { font-family: var(--song); color: var(--pine); font-size: 15px; }
.example-meaning { color: var(--muted); font-size: 11px; }
.example-item a { color: var(--pine); font-size: 11px; }

/* Qing family */
.qing-canvas { display: flex; align-items: center; justify-content: center; gap: 0; }
.qing-part { position: relative; border: 0; background: transparent; color: var(--ink); font-family: var(--song); font-size: clamp(90px,11vw,142px); line-height: 1; padding: 12px; cursor: pointer; }
.qing-canvas.is-split { gap: 25px; }
.qing-canvas.is-split .qing-whole { display: none; }
.qing-canvas.is-split .qing-part { border: 1px solid var(--line); background: rgba(255,255,255,.28); }
.qing-part[aria-pressed="true"] { color: var(--cinnabar); }
.qing-canvas:not(.is-split) .qing-part { position: absolute; color: transparent; width: 100px; height: 160px; padding: 0; }
.qing-canvas:not(.is-split) .qing-part[data-part="water"] { left: calc(50% - 100px); }
.qing-canvas:not(.is-split) .qing-part[data-part="green"] { left: 50%; }
.qing-canvas:not(.is-split) .qing-part:hover, .qing-canvas:not(.is-split) .qing-part[aria-pressed="true"] { color: transparent; }
.family-table { margin-top: 20px; }
.family-row { display: grid; grid-template-columns: 55px 85px 1fr 145px; gap: 14px; align-items: center; padding: 13px 0; border-bottom: 1px solid var(--line); }
.family-row.current { color: var(--pine); }
.family-glyph { font-family: var(--song); font-size: 33px; }
.family-pinyin { font-family: var(--song); }
.family-meaning, .family-clue { color: var(--muted); font-size: 11px; }
.word-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.word-card { border-top: 2px solid rgba(49,95,82,.25); padding: 15px 0; }
.word-card strong { font-family: var(--song); font-size: 29px; font-weight: 400; }
.word-card span { display: block; }
.word-card .word-pinyin { color: var(--pine); font-family: var(--song); }
.word-card .word-meaning { color: var(--muted); font-size: 11px; }

/* Rare complex character */
.complex-canvas { min-height: 360px; }
.complex-glyph { font-family: var(--song); font-size: clamp(125px,15vw,195px); line-height: 1; }
.dragon-structure { position: relative; width: 290px; height: 270px; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; align-items: center; justify-items: center; }
.dragon-part { border: 1px solid transparent; background: transparent; color: var(--ink); font-family: var(--song); font-size: 78px; line-height: 1; padding: 5px; cursor: pointer; }
.dragon-part:first-child { grid-column: 1 / -1; }
.dragon-part[aria-pressed="true"] { color: var(--cinnabar); border-color: rgba(163,58,43,.35); background: rgba(163,58,43,.05); }
.reading-note { border-left: 2px solid var(--cinnabar); padding-left: 15px; }
.reading-note strong { display: block; font-size: 12px; margin-bottom: 6px; }
.reading-note p { margin: 0; }
.structure-fact { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-top: 22px; }
.structure-fact div { border-top: 1px solid var(--line); padding-top: 12px; }
.structure-fact strong { display: block; font-family: var(--song); color: var(--pine); font-size: 22px; font-weight: 400; }
.structure-fact span { color: var(--muted); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }

@media (max-width: 900px) {
  .detail-grid { grid-template-columns: 1fr; }
  .info-rail { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
  .sources { grid-column: 1 / -1; }
  .heading-note { max-width: 220px; }
}
@media (max-width: 600px) {
  .site-header { height: 64px; padding: 0 16px; gap: 12px; }
  .wordmark { font-size: 12px; gap: 7px; }
  .seal { width: 26px; height: 26px; font-size: 17px; }
  .nav { gap: 12px; }
  .nav a, .nav span { font-size: 10px; }
  .free-note { display: none; }
  .samples-hero { padding: 50px 23px 45px; }
  .hero-copy h1 { font-size: 43px; }
  .sample-list { padding: 30px 20px 55px; }
  .sample-row { grid-template-columns: 30px 62px minmax(0,1fr) auto; gap: 12px; padding: 22px 0; }
  .sample-glyph { font-size: 48px; }
  .sample-row h2 { font-size: 20px; }
  .sample-row p { font-size: 10px; }
  .sample-category { font-size: 8px; }
  .detail-intro { padding: 25px 19px 36px; }
  .breadcrumbs { margin-bottom: 20px; }
  .page-tabs { margin-bottom: 28px; }
  .detail-heading { display: block; }
  .detail-heading h1 { gap: 15px; }
  .title-glyph { font-size: 78px; }
  .title-pinyin { font-size: 34px; }
  .title-meaning { font-size: 21px; }
  .heading-note { max-width: none; border-left: 0; border-top: 1px solid var(--line); margin-top: 25px; padding: 17px 0 0; }
  .detail-grid { padding: 36px 19px 55px; gap: 45px; }
  .stage-heading { display: block; }
  .stage-heading .button { margin-top: 13px; }
  .character-canvas { min-height: 280px; }
  .large-glyph { font-size: 145px; }
  .info-rail { display: block; }
  .variant-grid { grid-template-columns: 1fr; }
  .example-item { grid-template-columns: 35px 68px 1fr auto; gap: 8px; }
  .family-row { grid-template-columns: 40px 63px 1fr; gap: 9px; }
  .family-clue { grid-column: 2 / -1; margin-top: -8px; }
  .word-list { grid-template-columns: 1fr; }
  .dragon-structure { width: 260px; height: 250px; }
  .dragon-part { font-size: 69px; }
  .page-footer { align-items: start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

@media (max-width: 340px) {
  .site-header { padding: 0 8px; gap: 8px; }
  .site-header .nav { gap: 6px; }
  /* Preserve the 10px mobile nav size: 12px makes the nav's min-content
     width exceed the 305px client area of a 320px desktop-class viewport. */
  .site-header .nav a { font-size: 10px; }
}


/* CXP-UI-WORDMARK-20261108 logo-only: three-color text wordmark (scoped to .wordmark) */
.wordmark { font-family: "Noto Sans", -apple-system, "Segoe UI", sans-serif; font-weight: 730; letter-spacing: -.045em; font-size: 28px; gap: 0; }
.wordmark .wm-zh { color: #1D1D1F; }
.wordmark .wm-x { color: #D9362B; margin: 0 .012em; }
.wordmark .wm-pz { color: #0066CC; margin-left: -.01em; }
@media (max-width: 600px) { .wordmark { font-size: 23px; } }