:root {
  --bg: #efece4;
  --paper: #fbfaf6;
  --ink: #1a1814;
  --muted: #5f594e;
  --faint: #8a8376;
  --line: #e3dcd0;
  --accent: #1e3a34;
  --mark: #f3e6c8;
  --sans: "Noto Sans CJK SC", "Liberation Sans", "Segoe UI", sans-serif;
  --serif: "Liberation Serif", "Noto Serif CJK SC", "Palatino Linotype", serif;
  --cjk: "Noto Serif CJK SC", "Noto Serif CJK TC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
}
a { color: inherit; }
button, input { font: inherit; }

.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.wrap-narrow { width: min(760px, calc(100% - 40px)); margin: 0 auto; }

.mast {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.mast-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  padding: 14px 0;
}
.brand { text-decoration: none; }
.brand b { font-weight: 650; letter-spacing: 0.08em; font-size: 13px; }
.brand span { display: block; font-family: var(--cjk); font-size: 18px; letter-spacing: 0.04em; margin-top: 2px; }
.mast-meta { color: var(--muted); font-size: 13px; text-align: right; }
.draft {
  display: inline-block;
  margin-top: 4px;
  padding: 1px 6px;
  border: 1px solid var(--line);
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.hero { padding: 42px 0 18px; }
.kicker {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 0.16em;
}
h1 {
  margin: 0;
  font-family: var(--cjk);
  font-weight: 560;
  font-size: 40px;
  letter-spacing: 0.03em;
  line-height: 1.25;
}
.seo-line {
  margin: 14px 0 0;
  max-width: 40em;
  color: var(--muted);
  font-size: 15px;
}
.rule {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.rule li {
  padding: 6px 10px;
  background: var(--paper);
  border: 1px solid var(--line);
  font-size: 13px;
}
.rule b { font-weight: 620; }

.week { margin: 28px 0 8px; }
.week h2 {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 620;
  letter-spacing: 0.08em;
}
.week h2 span { color: var(--faint); font-weight: 450; letter-spacing: 0; margin-left: 8px; }
.grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
.card {
  display: flex;
  flex-direction: column;
  min-height: 168px;
  padding: 14px 14px 12px;
  background: var(--paper);
  border: 1px solid var(--line);
  text-decoration: none;
}
.card.open { border-color: #c8bfae; }
.card.open:hover { border-color: var(--accent); }
.tag {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--accent);
}
.card h3 {
  margin: 10px 0 0;
  font-family: var(--cjk);
  font-size: 16px;
  font-weight: 560;
  line-height: 1.45;
}
.card p { margin: 8px 0 0; color: var(--faint); font-size: 12px; }
.card .go { margin-top: auto; padding-top: 12px; font-size: 13px; color: var(--accent); }

.foot {
  margin: 36px 0 28px;
  color: var(--faint);
  font-size: 12px;
  line-height: 1.7;
}

/* article */
.article-head { padding: 28px 0 8px; }
.back-catalog {
  display: inline-block;
  margin: 0 0 18px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
}
.back-catalog:hover { border-color: var(--accent); }
.article-head h1 { font-size: 34px; max-width: 18em; }
.en-title {
  margin: 8px 0 0;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  font-style: italic;
}
.facts { margin: 12px 0 0; color: var(--muted); font-size: 13px; }

.player {
  position: sticky;
  top: 0;
  z-index: 2;
  background: rgba(251, 250, 246, 0.94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.player-inner { display: flex; align-items: center; gap: 16px; padding: 10px 0; }
audio { width: min(420px, 46vw); height: 32px; }
.focus { margin: 0; min-width: 0; }
.focus em { font-family: var(--serif); font-style: italic; }
.focus span { display: block; color: var(--muted); font-size: 13px; font-style: normal; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: 28px;
  padding: 22px 0 10px;
}
.pager { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; }
.pager button {
  min-width: 36px;
  height: 32px;
  padding: 0 8px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}
.pager button.on { background: var(--accent); border-color: var(--accent); color: #f7f4ec; }

.en {
  margin: 0;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.55;
}
.zh-label {
  margin: 22px 0 6px;
  color: var(--faint);
  font-size: 12px;
  letter-spacing: 0.14em;
}
.zh { margin: 0; font-family: var(--cjk); font-size: 17px; line-height: 1.75; }
.chart {
  display: block;
  width: 100%;
  background: #f7f6f3;
  border: 1px solid var(--line);
}
.hint { margin: 10px 0 0; color: var(--muted); font-size: 14px; }

.side h2, .block h2 {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 620;
}
.vocab { display: flex; flex-direction: column; gap: 10px; }
.vocab article {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.vocab strong { font-family: var(--serif); font-size: 16px; font-weight: 560; }
.vocab i { display: block; color: var(--faint); font-style: normal; font-size: 12px; }
.vocab p { margin: 3px 0 0; font-size: 14px; }
.tools { display: flex; gap: 8px; margin-top: 16px; }
.tools button, .drill button, .tabs button {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 6px 10px;
  cursor: pointer;
}
.tools button.on, .tabs button.on { border-color: var(--accent); color: var(--accent); }

.tabs { display: flex; gap: 8px; margin: 8px 0 0; }
.block { padding: 8px 0 36px; }
.note, .drill {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.note h3, .drill h3 { margin: 0 0 8px; font-family: var(--serif); font-size: 18px; font-weight: 560; }
.cols { display: grid; grid-template-columns: 0.72fr 1.7fr; gap: 22px; }
.cols p { margin: 0; }
.cols .lab { display: block; margin-bottom: 4px; color: var(--faint); font-size: 12px; letter-spacing: 0.12em; }
.blank {
  display: inline-block;
  min-width: 7em;
  border-bottom: 1px solid var(--ink);
  text-align: center;
}
.answer { margin-top: 8px; padding: 8px 10px; background: var(--mark); }
.hidden { display: none; }

.cover {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  min-height: 320px;
  padding: 32px 28px;
  background: var(--paper);
  border: 1px solid var(--line);
}
.cover .mark { margin: 0; color: var(--accent); font-size: 12px; letter-spacing: 0.16em; }
.cover h2 {
  margin: 14px 0 8px;
  font-family: var(--cjk);
  font-size: 32px;
  font-weight: 560;
  letter-spacing: 0.02em;
  line-height: 1.3;
}
.cover-en { margin: 0; font-family: var(--serif); font-style: italic; font-size: 18px; }
.deck { margin: 16px 0 0; color: var(--muted); }
.bars, .points { display: flex; flex-direction: column; justify-content: flex-end; gap: 18px; }
.points { margin: 0; padding: 0; list-style: none; gap: 0; }
.points li { margin: 0; padding: 12px 0; border-top: 1px solid var(--line); font-family: var(--cjk); font-size: 15px; line-height: 1.55; }
.points span { display: block; margin-bottom: 4px; color: var(--faint); font-family: var(--sans); font-size: 12px; letter-spacing: 0.14em; }
.bar-group p { margin: 0 0 8px; font-size: 12px; letter-spacing: 0.08em; color: var(--faint); }
.bar-row { display: grid; grid-template-columns: 42px 1fr 40px; gap: 8px; align-items: center; margin-top: 6px; font-size: 13px; }
.bar-track { display: block; height: 8px; background: #e6e0d4; }
.bar-fill { display: block; height: 8px; background: var(--accent); }

.play-actions { display: flex; gap: 8px; flex: none; }
.play-actions button, .choice button, .pick button {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: 6px 10px;
  cursor: pointer;
}
.choice button, .pick button { display: block; margin: 6px 0; text-align: left; }
.choice button.right, .pick button.right { border-color: var(--accent); background: #e7f0ec; }
.choice button.wrong, .pick button.wrong { border-color: #8f2d2d; background: #f8ecec; }
.why { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.sale-actions { display: flex; gap: 10px; margin-top: 18px; }
.sale-actions a, .sale-actions button {
  display: inline-block;
  padding: 10px 14px;
  background: var(--accent);
  color: #f7f4ec;
  text-decoration: none;
  border: 0;
  cursor: pointer;
}
.sale-actions .ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.feedback {
  display: inline-block;
  margin-top: 14px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  background: transparent;
  font-size: 14px;
}
[hidden] { display: none !important; }
.buy { display: grid; gap: 10px; max-width: 440px; margin-top: 8px; }
.buy label { display: grid; gap: 4px; font-size: 14px; flex: 1; }
.buy input { border: 1px solid var(--line); background: #fff; padding: 8px 10px; }
.buy .row { display: flex; gap: 8px; align-items: end; }
.buy .row button { border: 1px solid var(--line); background: var(--paper); padding: 8px 12px; cursor: pointer; }
.offers { display: grid; gap: 8px; margin-top: 8px; }
.offers button { text-align: left; border: 0; background: var(--accent); color: #f7f4ec; padding: 10px 14px; cursor: pointer; }
.offers button:disabled { opacity: 0.45; cursor: default; }
.plans { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 16px; max-width: 820px; margin-top: 28px; }
.plans.single { grid-template-columns: minmax(0, 420px); }
.plan { background: var(--paper); border: 1px solid var(--line); padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.plan.featured { background: var(--accent); color: #f7f4ec; border-color: var(--accent); }
.plan-kicker { margin: 0; font-size: 12px; letter-spacing: 0.14em; }
.plan .price { margin: 4px 0 0; font-family: var(--cjk); font-size: 46px; line-height: 1; }
.plan .price span { font-size: 18px; margin-right: 2px; }
.plan h2 { margin: 0; font-family: var(--cjk); font-size: 22px; font-weight: 560; }
.plan ul { margin: 4px 0 0; padding-left: 1.15em; font-size: 14px; }
.plan li + li { margin-top: 4px; }
.plan-note { margin: 0; font-size: 13px; opacity: 0.8; }
.plan-buy { margin-top: 12px; border: 0; background: var(--accent); color: #f7f4ec; padding: 12px 14px; cursor: pointer; }
.plan.featured .plan-buy { background: #f7f4ec; color: var(--accent); }
.plan-buy:disabled { opacity: 0.55; cursor: default; }
.buyer { min-height: 1.4em; margin: 16px 0 0; color: var(--muted); font-size: 14px; }
.login-mask { position: fixed; inset: 0; background: rgba(40, 36, 28, 0.45); display: grid; place-items: center; z-index: 20; }
.login-dialog { width: min(440px, calc(100% - 32px)); background: #f7f4ec; border: 1px solid var(--line); padding: 22px; }
.login-dialog h2 { margin: 0 0 8px; font-size: 26px; }
.login-dialog .buy { max-width: none; }
.login-dialog #pay { margin-top: 4px; width: 100%; background: var(--accent); color: #f7f4ec; border: 0; padding: 12px 14px; cursor: pointer; }

@media (max-width: 900px) {
  h1 { font-size: 30px; }
  .grid { grid-template-columns: 1fr 1fr; }
  .layout, .cols, .cover { grid-template-columns: 1fr; }
  .player-inner { flex-direction: column; align-items: stretch; }
  audio { width: 100%; }
  .mast-inner { align-items: flex-start; }
  .plans { grid-template-columns: 1fr; }
}
.essay { padding-bottom: 48px; }
.essay h1 { font-size: 34px; max-width: 14em; }
.essay p { max-width: 38em; font-size: 17px; line-height: 1.8; }
.essay .quote {
  margin: 22px 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  max-width: 36em;
  font-family: var(--serif);
}
.essay .next { margin-top: 28px; }

@media (max-width: 560px) {
  .wrap, .wrap-narrow { width: calc(100% - 28px); }
  .grid { grid-template-columns: 1fr; }
  .article-head h1 { font-size: 26px; }
  .en { font-size: 18px; }
}