/* ====================================================================
   Study Terminal — site-wide design system
   cream paper + rose wash · sharp-cornered windows · 1px ink borders
   solid coral offset shadows · mono uppercase labels · serif display
   ==================================================================== */
:root {
  /* new tokens */
  --bg:          #f3eee1;
  --panel:       #fbf8ef;   /* window / card body */
  --panel-deep:  #ece4d1;   /* titlebars, cues, strips */
  --border:      #2b2620;   /* 1px window borders */
  --hairline:    #ddd3bd;   /* inner dividers */
  --coral:       #c05a3e;   /* actions / accent */
  --coral-deep:  #a84a32;
  --shadow-c:    #cf6a4b;   /* solid offset shadow color */
  --green:       #3e7d54;

  /* legacy aliases — older pages reference these names */
  --beige:       var(--bg);
  --beige-deep:  var(--panel-deep);
  --kraft:       var(--panel-deep);
  --paper:       var(--panel);
  --ink:         #211d15;
  --ink-soft:    #6f6659;
  --red:         var(--coral);
  --red-deep:    var(--coral-deep);
  --gold:        #d6a14a;
  --line:        var(--hairline);
  --rule:        rgba(120, 92, 50, 0.08);
  --shadow:      7px 7px 0 0 var(--shadow-c);
  --shadow-sm:   4px 4px 0 0 var(--border);

  --serif: "Newsreader", "Noto Serif SC", Georgia, "Songti SC", serif;
  --sans:  "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, Menlo, monospace;
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; font-family: var(--sans); color: var(--ink); line-height: 1.7;
  background:
    radial-gradient(900px 480px at 8% -4%, rgba(233,169,148,.28), transparent 62%),
    radial-gradient(700px 420px at 100% 12%, rgba(214,161,74,.10), transparent 60%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.2; color: var(--ink); margin: 0; }
a { color: var(--coral); }
img { max-width: 100%; height: auto; display: block; border: 1px solid var(--border); box-shadow: var(--shadow); }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.section { padding: 66px 0; }
.section.tight { padding: 50px 0; }
.section-title { font-size: clamp(1.6rem, 3.4vw, 2.2rem); margin: 10px 0 12px; }
.mt0 { margin-top: 0; } .mb0 { margin-bottom: 0; } .center { text-align: center; }
.lead { font-size: 1.08rem; color: var(--ink-soft); max-width: 62ch; margin: 0; }

/* mono label voice */
.tag, .eyebrow {
  font: 700 .68rem var(--mono); letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-soft); margin: 0 0 8px; display: block;
}
.tag b, .eyebrow b { color: var(--coral); }

/* ---- header (both .hd and legacy .site-header) ---- */
.hd, .site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(243,238,225,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.hd .wrap, .site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: 60px; }
.brand { font-family: var(--serif); font-weight: 600; font-size: 1.12rem; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand .dot { color: var(--coral); }
.nav { display: flex; align-items: center; gap: 4px; min-width: 0; }
.nav-links { display: flex; gap: 2px; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  font: 700 .68rem var(--mono); letter-spacing: .14em; text-transform: uppercase;
  color: var(--ink-soft); text-decoration: none; padding: 9px 12px; white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--coral); }
.nav-links a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--coral); }
.lang-switch { flex: none; font: 700 .7rem var(--mono); letter-spacing: .1em; border: 1px solid var(--border); background: var(--panel); color: var(--ink); text-decoration: none; padding: 6px 12px; }
.lang-switch:hover { background: var(--coral); color: #fff; border-color: var(--coral); }

/* ---- hero (marketing pages) ---- */
.hero { padding: 68px 0 58px; }
.hero h1 { font-size: clamp(2rem, 4.6vw, 2.9rem); margin: 10px 0 16px; max-width: 22ch; letter-spacing: -.01em; }
.hero h1 em { font-style: italic; color: var(--coral); }
.hero p.sub, .hero .sub { font-size: 1.13rem; color: var(--ink-soft); max-width: 58ch; margin: 0 0 6px; }
.microcopy {
  display: inline-block; border: 1px solid var(--hairline); border-left: 3px solid var(--coral);
  background: var(--panel); padding: 9px 14px; font-size: .88rem; color: var(--ink-soft); margin: 14px 0 6px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 24px; }
/* homepage split hero: copy left, live-demo window right */
.hero-split { display: grid; grid-template-columns: 1.02fr 1fr; gap: 54px; align-items: center; }

/* ---- buttons ---- */
.btn { display: inline-block; font: 600 .95rem var(--sans); text-decoration: none; padding: 13px 24px; border: 1px solid var(--border); transition: transform .07s ease, background .15s ease, color .15s ease; }
.btn:active { transform: translate(2px, 2px); }
.btn-primary { background: var(--coral); color: #fff; border-color: var(--coral-deep); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--coral-deep); }
.btn-ghost { background: var(--panel); color: var(--ink); box-shadow: 4px 4px 0 0 rgba(43,38,32,.25); }
.btn-ghost:hover { color: var(--coral); }

/* ---- trust strip (both .strip and legacy .trust) ---- */
.strip, .trust { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--panel-deep); }
.strip .wrap, .trust .wrap { display: flex; flex-wrap: wrap; gap: 8px 34px; justify-content: center; padding: 13px 24px; }
.strip span, .trust span { font: 700 .68rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); }
.strip .star, .trust .star { color: var(--gold); letter-spacing: .05em; }

/* ---- windows ---- */
.win { border: 1px solid var(--border); background: var(--panel); box-shadow: 12px 12px 0 0 var(--shadow-c); }
.win-bar { display: flex; align-items: center; gap: 10px; padding: 10px 16px; background: var(--panel-deep); border-bottom: 1px solid var(--border); }
.win-dots { display: flex; gap: 6px; flex: none; }
.win-dots i { width: 10px; height: 10px; border-radius: 50%; }
.win-dots i:nth-child(1) { background: #d95c4a; }
.win-dots i:nth-child(2) { background: var(--gold); }
.win-dots i:nth-child(3) { background: #7ba05b; }
.win-title { font: 700 .68rem var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }
.win-title b { color: var(--ink); font-weight: 700; }
.win-status { display: flex; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); background: var(--panel-deep); padding: 8px 16px; font: 700 .64rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-soft); }
.win-status .ok { color: var(--green); }

/* ---- grids & cards ---- */
.grid { display: grid; gap: 26px; }
.grid.cols-3, .cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2, .cols-2 { grid-template-columns: repeat(2, 1fr); }

.wcard, .card { border: 1px solid var(--border); background: var(--panel); box-shadow: var(--shadow); transition: transform .1s ease, box-shadow .1s ease; }
.wcard:hover, .card:hover { transform: translate(-2px, -2px); box-shadow: 9px 9px 0 0 var(--shadow-c); }
.wcard .wcard-bar { padding: 8px 16px; border-bottom: 1px solid var(--border); background: var(--panel-deep); font: 700 .64rem var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); }
.wcard .body { padding: 18px 18px 20px; }
.card { padding: 22px 22px 24px; }
.wcard h3, .card h3 { font-size: 1.16rem; margin: 0 0 8px; }
.wcard p, .card p { margin: 0 0 14px; color: var(--ink-soft); font-size: .94rem; }
.wcard .more, .card .more { font: 700 .72rem var(--mono); letter-spacing: .12em; text-transform: uppercase; text-decoration: none; color: var(--coral); }
.wcard .more::after, .card .more::after { content: " →"; }

/* lesson block */
.lesson { background: var(--panel); border: 1px solid var(--border); border-left: 3px solid var(--coral); padding: 20px 22px; }
.lesson ul { margin: 0; padding-left: 20px; }
.lesson li { margin: 9px 0; }
.callout { border: 1px solid var(--hairline); border-left: 3px solid var(--gold); background: var(--panel); padding: 13px 16px; color: var(--ink-soft); font-size: .9rem; margin-top: 20px; }
.disclaimer { font-size: .9rem; }

/* Cornell sample table */
.note-table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--border); box-shadow: var(--shadow); }
.note-table th, .note-table td { text-align: left; padding: 12px 15px; border-bottom: 1px solid var(--hairline); vertical-align: top; font-size: .95rem; }
.note-table th { background: var(--panel-deep); border-bottom: 1px solid var(--border); font: 700 .68rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); }
.note-table td:first-child { font-family: var(--serif); font-weight: 600; white-space: nowrap; width: 1%; border-right: 1px solid var(--hairline); background: rgba(236,228,209,.45); }
.note-table tr:last-child td { border-bottom: none; }

/* ---- flip cards ---- */
.cards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.flip { background: transparent; perspective: 1000px; height: 172px; cursor: pointer; border: none; padding: 0; font-family: inherit; }
.flip-inner, .flip .flip-inner { display: block; position: relative; width: 100%; height: 100%; transition: transform .45s; transform-style: preserve-3d; }
.flip.flipped .flip-inner { transform: rotateY(180deg); }
.flip-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border: 1px solid var(--border); padding: 18px; display: flex; flex-direction: column; justify-content: center; text-align: center; }
.flip-front { background: var(--panel); box-shadow: 5px 5px 0 0 var(--shadow-c); }
.flip-front .term { font-family: var(--serif); font-weight: 600; font-size: 1.16rem; }
.flip-front .ipa { font: 500 .74rem var(--mono); color: var(--ink-soft); margin-top: 6px; letter-spacing: .05em; }
.flip-front .hint { position: absolute; bottom: 10px; left: 0; right: 0; font: 700 .58rem var(--mono); color: #b3a88f; letter-spacing: .14em; text-transform: uppercase; }
.flip-back { background: var(--coral); color: #fff8f2; transform: rotateY(180deg); font-size: .94rem; line-height: 1.5; }

/* ---- product / pricing ---- */
.prod { display: grid; grid-template-columns: 1.1fr 1fr; gap: 30px; align-items: center; }
.price { font: 700 1.05rem var(--mono); color: var(--coral); }
.kv { width: 100%; border-collapse: collapse; margin: 0 0 16px; }
.kv td { padding: 6px 0; font-size: .88rem; border-bottom: 1px dashed var(--hairline); }
.kv td:first-child { color: var(--ink-soft); font: 500 .74rem var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.kv td:last-child { text-align: right; font-weight: 600; }
.kv tr:last-child td { border-bottom: none; }
.kv .ok { color: var(--green); font: 700 .78rem var(--mono); }
.feature-table { width: 100%; border-collapse: collapse; }
.feature-table td { padding: 8px 10px; border-bottom: 1px dashed var(--hairline); font-size: .93rem; }
.feature-table td:first-child { color: var(--ink-soft); width: 42%; }

/* ---- free vs paid ---- */
.fp { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.fp .col { border: 1px solid var(--border); padding: 20px 22px; }
.fp .free { background: var(--panel); box-shadow: var(--shadow); }
.fp .paid { background: #262119; color: #f4ecda; box-shadow: 7px 7px 0 0 var(--border); }
.fp h3 { color: inherit; margin: 0 0 10px; }
.fp ul { margin: 0; padding-left: 18px; }
.fp li { margin: 8px 0; }
.fp .win { box-shadow: 9px 9px 0 0 var(--shadow-c); }
.fp .win ul { padding: 18px 20px 20px 36px; }
.fp .win li { margin: 7px 0; font-size: .95rem; }
.fp .win.paid { background: var(--panel); color: var(--ink); }
.fp .win.paid .win-bar { background: var(--ink); border-color: var(--ink); }
.fp .win.paid .win-bar .win-title { color: #cdbfa8; }
.fp .win.paid .win-bar .win-title b { color: #f4ecda; }

/* ---- decision guide ---- */
.guide { display: grid; gap: 12px; }
.guide .row { border: 1px solid var(--hairline); background: var(--panel); padding: 13px 18px; display: flex; gap: 14px; align-items: baseline; flex-wrap: wrap; }
.guide .row b { color: var(--coral); font-family: var(--serif); white-space: nowrap; }

/* ---- steps ---- */
.steps { list-style: none; margin: 26px 0 0; padding: 0; border: 1px solid var(--border); background: var(--panel); box-shadow: 10px 10px 0 0 var(--shadow-c); }
.steps li { display: flex; gap: 18px; align-items: baseline; padding: 15px 20px; border-bottom: 1px solid var(--hairline); }
.steps li:last-child { border-bottom: none; }
.steps .num { font: 700 .78rem var(--mono); color: var(--coral); flex: none; width: auto; height: auto; border-radius: 0; background: none; display: inline; }
.steps b { font-family: var(--serif); font-size: 1.03rem; font-weight: 600; }
.steps p { margin: 2px 0 0; color: var(--ink-soft); font-size: .92rem; }

/* ---- about / faq ---- */
.about { border: 1px solid var(--border); background: var(--panel); box-shadow: var(--shadow); padding: 26px 28px; }
.about-win .body { padding: 24px 26px; font-size: 1.06rem; line-height: 1.75; }
.about-win .body .sig { font: 700 .68rem var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--ink-soft); margin-top: 14px; }
.faq details { border: 1px solid var(--hairline); background: var(--panel); margin-bottom: 10px; padding: 2px 18px; }
.faq summary { cursor: pointer; font-family: var(--serif); font-weight: 600; padding: 12px 0; }
.faq p { color: var(--ink-soft); margin: 0 0 14px; }

/* ---- footer (both .ft and legacy .site-footer) ---- */
.ft, .site-footer { background: #262119; color: #cdbfa8; padding: 46px 0; font-size: .9rem; border-top: 1px solid var(--border); }
.ft a, .site-footer a { color: #f4ecda; text-decoration: none; }
.ft a:hover, .site-footer a:hover { color: var(--gold); }
.ft-grid, .footer-grid { display: flex; flex-wrap: wrap; gap: 34px; justify-content: space-between; }
.ft h4, .footer-grid h4 { font: 700 .68rem var(--mono); letter-spacing: .18em; text-transform: uppercase; color: #f4ecda; margin: 0 0 12px; }
.ft ul, .footer-grid ul { list-style: none; margin: 0; padding: 0; }
.ft li, .footer-grid li { margin: 7px 0; }

/* ---- homepage live-demo window ---- */
.demo-wrap { padding: 6px 16px 20px 0; }
.demo-kicker { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.demo-kicker .tag { margin: 0; display: inline; }
.demo-kicker .pill { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--border); background: var(--panel); padding: 5px 12px; font: 700 .68rem var(--mono); letter-spacing: .12em; text-transform: uppercase; }
.demo-kicker .pill i { width: 7px; height: 7px; background: var(--coral); display: inline-block; }
.tabs { display: flex; gap: 24px; padding: 0 18px; border-bottom: 1px solid var(--border); background: var(--panel); }
.tabs button { font: 700 .7rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); background: none; border: none; border-bottom: 2px solid transparent; padding: 12px 0 10px; cursor: pointer; margin-bottom: -1px; }
.tabs button:hover { color: var(--coral); }
.tabs button.active { color: var(--ink); border-bottom-color: var(--coral); }
.panes { position: relative; min-height: 240px; }
.pane { display: none; padding: 20px 18px; }
.pane.active { display: block; }
.pane-hint { font: 500 .66rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-soft); margin: 0 0 12px; }
.pane-hint b { color: var(--green); }
.crow { display: grid; grid-template-columns: 118px 1fr; border: 1px solid var(--hairline); margin-bottom: 10px; }
.crow .cue { background: var(--panel-deep); border-right: 1px solid var(--hairline); padding: 13px 12px; font-family: var(--serif); font-weight: 600; font-size: .9rem; }
.crow .note { position: relative; padding: 13px 14px; font-size: .86rem; }
.crow .note .cover { position: absolute; inset: 4px; border: 1px dashed #b6a67f; background: repeating-linear-gradient(-45deg, #e9e0ca, #e9e0ca 8px, #e3d8bf 8px, #e3d8bf 16px); display: flex; align-items: center; justify-content: center; font: 700 .62rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: #85764f; cursor: pointer; transition: opacity .18s; }
.crow .note .cover:hover { color: var(--coral); border-color: var(--coral); }
.crow .note.open .cover { opacity: 0; pointer-events: none; }
.fcard { perspective: 900px; height: 168px; cursor: pointer; }
.fcard-inner { position: relative; width: 100%; height: 100%; transition: transform .45s; transform-style: preserve-3d; }
.fcard.flipped .fcard-inner { transform: rotateY(180deg); }
.fface { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border: 1px solid var(--border); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 16px; }
.fface.front { background: var(--panel); }
.fface.front .term { font-family: var(--serif); font-weight: 600; font-size: 1.3rem; }
.fface.front .ipa { font: 500 .72rem var(--mono); color: var(--ink-soft); margin-top: 8px; letter-spacing: .06em; }
.fface.back { background: var(--coral); color: #fff8f2; transform: rotateY(180deg); font-size: .92rem; line-height: 1.55; }
.qq { font-family: var(--serif); font-weight: 600; font-size: 1.02rem; margin: 0 0 12px; }
.qopts { display: grid; gap: 7px; }
.qopt { text-align: left; font: 500 .88rem var(--sans); background: var(--panel); border: 1px solid var(--hairline); padding: 10px 13px; cursor: pointer; color: var(--ink); }
.qopt:hover { border-color: var(--coral); }
.qopt.correct { border-color: var(--green); background: #3e7d5414; font-weight: 600; }
.qopt.correct::after { content: "  ✓ correct"; font: 700 .62rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--green); }
.qopt.wrong { border-color: var(--coral); color: var(--coral); text-decoration: line-through; }
.qexpl { display: none; margin-top: 12px; border-left: 3px solid var(--green); background: var(--panel-deep); padding: 9px 13px; font-size: .84rem; color: var(--ink-soft); }
.qdone .qexpl { display: block; }

/* ---- root language chooser (noscript fallback) ---- */
.chooser { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.chooser .box { background: var(--panel); border: 1px solid var(--border); box-shadow: 12px 12px 0 0 var(--shadow-c); padding: 44px; text-align: center; max-width: 480px; }
.chooser h1 { font-size: 1.7rem; margin: 0 0 6px; }
.chooser p { color: var(--ink-soft); }
.chooser .langs { display: flex; gap: 16px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }

/* ---- responsive ---- */
@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-2, .cols-3, .cols-2, .cards-grid { grid-template-columns: 1fr; }
  .cards-grid { grid-template-columns: 1fr 1fr; }
  .prod, .fp { grid-template-columns: 1fr; }
  .hd .wrap, .site-header .wrap { height: auto; flex-wrap: wrap; padding-top: 10px; padding-bottom: 8px; row-gap: 4px; }
  .nav { flex: 1 1 100%; justify-content: space-between; }
  .hero { padding: 50px 0 44px; }
  .hero-split { grid-template-columns: 1fr; gap: 40px; }
  .demo-wrap { padding-right: 14px; }
}
@media (max-width: 520px) {
  .cards-grid { grid-template-columns: 1fr; }
  .section { padding: 46px 0; }
  .cta-row .btn { width: 100%; text-align: center; }
  .win, .steps { box-shadow: 8px 8px 0 0 var(--shadow-c); }
}
@media (prefers-reduced-motion: reduce) {
  .flip-inner, .fcard-inner, .btn, .wcard, .card { transition: none; }
}

/* ====================================================================
   Chinese typography tuning — the mono-label voice is sized for Latin;
   CJK glyphs need larger sizes, tighter tracking, looser line-height.
   ==================================================================== */
html[lang="zh-CN"] .brand { font-size: 1.28rem; }
html[lang="zh-CN"] .nav-links a { font: 600 .84rem var(--sans); letter-spacing: .06em; padding: 8px 12px; }
html[lang="zh-CN"] .hero h1 { letter-spacing: 0; line-height: 1.32; font-size: clamp(1.9rem, 4.2vw, 2.6rem); }
html[lang="zh-CN"] .section-title { letter-spacing: 0; line-height: 1.35; }
html[lang="zh-CN"] .tag, html[lang="zh-CN"] .eyebrow { font-size: .8rem; letter-spacing: .1em; }
html[lang="zh-CN"] .win-title { font-size: .78rem; letter-spacing: .08em; }
html[lang="zh-CN"] .tabs button { font-size: .84rem; letter-spacing: .05em; }
html[lang="zh-CN"] .pane-hint { font-size: .78rem; letter-spacing: .05em; }
html[lang="zh-CN"] .strip span, html[lang="zh-CN"] .trust span { font-size: .8rem; letter-spacing: .08em; }
html[lang="zh-CN"] .wcard-bar { font-size: .74rem; letter-spacing: .08em; }
html[lang="zh-CN"] .win-status { font-size: .74rem; letter-spacing: .06em; }
html[lang="zh-CN"] .demo-kicker .pill { font-size: .8rem; letter-spacing: .06em; }
html[lang="zh-CN"] .crow .note .cover { font-size: .78rem; letter-spacing: .05em; }
html[lang="zh-CN"] .kv td:first-child { font-size: .82rem; letter-spacing: .04em; }
html[lang="zh-CN"] .more { font-size: .8rem !important; letter-spacing: .05em !important; }
html[lang="zh-CN"] .lang-switch { font-size: .78rem; }
/* day-1 lesson page */
html[lang="zh-CN"] .lprogress .label { font-size: .74rem; letter-spacing: .05em; }
html[lang="zh-CN"] .recall-toggle { font-size: .8rem; letter-spacing: .05em; }
html[lang="zh-CN"] .cover-btn { font-size: .78rem; letter-spacing: .05em; }
html[lang="zh-CN"] .chip { font-size: .82rem; }
html[lang="zh-CN"] .quiz-q .qnum { font-size: .76rem; letter-spacing: .08em; }
html[lang="zh-CN"] .ex-score { font-size: .82rem; letter-spacing: .02em; }
html[lang="zh-CN"] .syllabus .lock { font-size: .74rem; letter-spacing: .04em; }
html[lang="zh-CN"] .ft h4, html[lang="zh-CN"] .footer-grid h4 { font-size: .8rem; letter-spacing: .1em; }
/* the 中文 button on EN pages is CJK too */
.lang-switch { font-size: .78rem; }