:root {
  --bg: #edf4ea;
  --paper: #fbfcf8;
  --paper-soft: #f5f8f2;
  --ink: #27332b;
  --text: #465047;
  --muted: #7a857c;
  --green: #5f8068;
  --green-deep: #42634d;
  --green-soft: #dfeade;
  --line: #d9e4d8;
  --shadow: 0 18px 55px rgba(58, 83, 64, .09);
  --radius: 22px;
  --reading-size: 18px;
}

* { box-sizing: border-box; }
html { background: var(--bg); scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 12%, rgba(255,255,255,.9), transparent 24rem),
    linear-gradient(145deg, #edf4ea, #f4f7f0 55%, #e7f0e5);
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  min-height: 100vh;
}
button, input, textarea, select { font: inherit; }
button { color: inherit; }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 260px 1fr; }
.sidebar {
  position: sticky; top: 0; height: 100vh; padding: 34px 28px;
  border-right: 1px solid rgba(95,128,104,.12); display: flex; flex-direction: column;
  background: rgba(248,251,246,.72); backdrop-filter: blur(18px);
}
.brand { display: flex; align-items: center; gap: 13px; margin-bottom: 52px; }
.brand-seal {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px;
  color: white; background: var(--green-deep); font: 700 22px "SimSun", serif;
  box-shadow: 0 8px 20px rgba(66,99,77,.2);
}
.brand strong { display: block; font: 700 23px "SimSun", serif; color: var(--ink); letter-spacing: .12em; }
.brand small { display: block; color: var(--muted); font-size: 11px; margin-top: 3px; letter-spacing: .08em; }
.desktop-nav { display: grid; gap: 8px; }
.nav-btn {
  border: 0; background: transparent; border-radius: 13px; padding: 13px 15px; text-align: left;
  cursor: pointer; color: #667168; transition: .18s ease; display: flex; gap: 11px; align-items: center;
}
.nav-btn:hover { background: rgba(223,234,222,.65); color: var(--green-deep); }
.nav-btn.active { color: var(--green-deep); background: var(--green-soft); font-weight: 700; }
.nav-icon { width: 1.3em; text-align: center; }
.sidebar blockquote {
  margin: auto 8px 0; color: #91a095; font: 15px/2 "SimSun", serif; letter-spacing: .08em;
  padding-left: 14px; border-left: 2px solid var(--line);
}
main { width: min(1020px, calc(100% - 80px)); margin: 0 auto; padding: 46px 0 90px; }
.page-head { display: flex; align-items: end; justify-content: space-between; margin-bottom: 26px; }
.eyebrow { color: var(--green); font-size: 13px; letter-spacing: .16em; font-weight: 700; }
h1, h2, h3 { color: var(--ink); margin-top: 0; }
h1 { font: 700 32px/1.3 "SimSun", serif; letter-spacing: .04em; margin-bottom: 8px; }
h2 { font: 700 25px/1.45 "SimSun", serif; }
h3 { font-size: 16px; }
.muted { color: var(--muted); }
.card { background: rgba(251,252,248,.94); border: 1px solid rgba(217,228,216,.85); border-radius: var(--radius); box-shadow: var(--shadow); }
.today-card { padding: clamp(28px, 5vw, 58px); position: relative; overflow: hidden; }
.today-card::after {
  content: "长\A短\A经"; white-space: pre; position: absolute; right: 5%; top: 12%; color: rgba(95,128,104,.065);
  font: 700 70px/1.02 "SimSun", serif; text-align: center; pointer-events: none;
}
.chapter-label { display: inline-flex; color: var(--green-deep); background: var(--green-soft); padding: 7px 12px; border-radius: 999px; font-size: 13px; margin-bottom: 20px; }
.today-card h2 { font-size: clamp(28px, 4vw, 42px); max-width: 650px; margin-bottom: 16px; }
.today-card .intro { font: var(--reading-size)/1.9 "SimSun", serif; max-width: 680px; color: #59645b; }
.meta-row { display: flex; gap: 24px; flex-wrap: wrap; margin: 28px 0; color: var(--muted); font-size: 14px; }
.meta-row strong { color: var(--ink); font-weight: 650; }
.primary, .secondary, .text-btn, .choice-btn {
  border: 0; cursor: pointer; border-radius: 14px; transition: transform .15s ease, background .15s ease;
}
.primary { background: var(--green-deep); color: white; padding: 14px 25px; font-weight: 700; box-shadow: 0 9px 22px rgba(66,99,77,.2); }
.primary:hover { background: #36563f; transform: translateY(-1px); }
.secondary { background: var(--green-soft); color: var(--green-deep); padding: 13px 20px; font-weight: 700; }
.secondary:hover { background: #d3e3d2; }
.text-btn { padding: 10px 4px; background: transparent; color: var(--green-deep); }
.action-row { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.gentle-row { margin-top: 22px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; gap: 12px; align-items: center; flex-wrap: wrap; font-size: 13px; color: var(--muted); }
.small-card-grid, .stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 18px; }
.small-card { padding: 20px; box-shadow: none; }
.small-card strong { display: block; color: var(--ink); font-size: 24px; margin-bottom: 5px; }
.section-title { margin: 42px 0 15px; display: flex; justify-content: space-between; align-items: center; }
.section-title h2 { margin: 0; font-size: 21px; }
.quote-card { padding: 24px 28px; font: 18px/1.8 "SimSun", serif; position: relative; }
.quote-card::before { content: "“"; color: var(--green-soft); font-size: 65px; line-height: 1; position: absolute; top: 6px; left: 12px; }
.quote-card p { margin: 0 0 0 14px; position: relative; }
.lesson-shell { max-width: 780px; margin: 0 auto; }
.lesson-shell.wide { max-width: 940px; }
.lesson-top { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin-bottom: 20px; }
.progress-track { height: 7px; border-radius: 10px; background: var(--line); overflow: hidden; flex: 1; }
.progress-bar { height: 100%; background: var(--green); border-radius: 10px; transition: width .3s ease; }
.lesson-card { padding: clamp(25px, 5vw, 48px); min-height: 520px; display: flex; flex-direction: column; }
.lesson-kicker { color: var(--green); font-size: 13px; font-weight: 700; letter-spacing: .12em; margin-bottom: 15px; }
.original { font: var(--reading-size)/2.15 "SimSun", "STSong", serif; color: #354138; white-space: pre-wrap; }
.text-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: stretch; }
.text-panel { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: #fdfdfb; }
.translation-panel { background: var(--paper-soft); }
.text-label { color: var(--green); font-size: 12px; font-weight: 700; letter-spacing: .12em; margin-bottom: 14px; }
.translation { white-space: pre-wrap; font-size: calc(var(--reading-size) - 1px); line-height: 2.05; }
.source-note { color: var(--muted); font-size: 12px; line-height: 1.7; margin: 15px 2px 0; }
.takeaway-list { margin: 20px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.takeaway-list li { position: relative; padding: 12px 15px 12px 40px; background: var(--paper-soft); border-radius: 12px; line-height: 1.7; }
.takeaway-list li::before { content: "要"; position: absolute; left: 13px; top: 13px; display: grid; place-items: center; width: 19px; height: 19px; border-radius: 50%; background: var(--green-soft); color: var(--green-deep); font-size: 10px; font-weight: 700; }
.explain { font-size: var(--reading-size); line-height: 2; }
.key-point { background: var(--paper-soft); border-left: 4px solid var(--green); padding: 18px 20px; border-radius: 0 12px 12px 0; line-height: 1.85; }
.lesson-card .action-row { margin-top: auto; padding-top: 32px; justify-content: space-between; }
.people-list { display: grid; gap: 12px; }
.person { background: var(--paper-soft); padding: 16px; border-radius: 14px; }
.person strong { color: var(--ink); display: block; margin-bottom: 6px; }
.question-box textarea, .note-input {
  width: 100%; min-height: 130px; resize: vertical; border: 1px solid var(--line); background: #fff;
  color: var(--text); border-radius: 14px; padding: 16px; outline: none; line-height: 1.75;
}
.question-box textarea:focus, .note-input:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(95,128,104,.1); }
.choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin: 22px 0; }
.choice-btn { padding: 16px; border: 1px solid var(--line); background: var(--paper-soft); text-align: left; }
.choice-btn:hover, .choice-btn.selected { border-color: var(--green); background: var(--green-soft); color: var(--green-deep); }
.chapter-card { margin-bottom: 16px; overflow: hidden; box-shadow: none; }
.chapter-head { padding: 20px 24px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--line); }
.chapter-head h2 { font-size: 20px; margin: 0; }
.lesson-list { display: grid; }
.lesson-row { padding: 17px 24px; display: grid; grid-template-columns: 34px 1fr auto; align-items: center; gap: 12px; border-bottom: 1px solid #edf1eb; }
.lesson-row:last-child { border: 0; }
.status-dot { width: 12px; height: 12px; border-radius: 50%; border: 2px solid #bdcbbd; }
.status-dot.done { background: var(--green); border-color: var(--green); }
.status-dot.current { background: #fff; border: 3px solid var(--green); box-shadow: 0 0 0 4px var(--green-soft); }
.lesson-row small { color: var(--muted); }
.book-heading { align-items: center; }
.book-metrics { text-align: right; padding: 15px 19px; border-left: 1px solid var(--line); }
.book-metrics strong { display: block; color: var(--green-deep); font: 700 29px "SimSun",serif; }
.book-metrics small { color: var(--muted); }
.search-box { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; padding: 13px 17px; background: rgba(251,252,248,.9); border: 1px solid var(--line); border-radius: 15px; }
.search-box span { color: var(--green); font: 700 17px "SimSun",serif; }
.search-box input { width: 100%; border: 0; outline: 0; background: transparent; color: var(--ink); }
.chapter-link { width: 100%; border: 0; background: transparent; text-align: left; cursor: pointer; }
.chapter-link:hover { background: var(--paper-soft); }
.chapter-link small { display: block; margin-top: 5px; }
.chapter-number { color: #91a095; font: 14px "SimSun",serif; }
.row-arrow { color: var(--green); font-size: 25px; }
.empty-result { padding: 40px; text-align: center; }
.chapter-reader { max-width: 880px; margin: 0 auto; }
.reader-head { padding: 22px 0 8px; }
.reader-head h1 { font-size: 38px; margin-top: 8px; }
.curated-notice { margin: 15px 0 18px; padding: 18px 20px; border-radius: 16px; background: var(--green-soft); color: var(--green-deep); display: flex; justify-content: space-between; align-items: center; gap: 20px; }
.curated-notice.quiet { background: #e9efe7; }
.curated-notice strong,.curated-notice span { display: block; }
.curated-notice span { margin-top: 4px; color: var(--muted); font-size: 13px; }
.full-original { padding: clamp(24px,5vw,50px); box-shadow: none; }
.full-original .original { line-height: 2.25; }
.thought-list { display: grid; gap: 14px; }
.thought { padding: 22px 25px; box-shadow: none; }
.thought .source { color: var(--green); font-size: 12px; margin-bottom: 10px; }
.thought p { color: var(--ink); font: 18px/1.8 "SimSun", serif; margin: 0; }
.settings-card { padding: 26px; box-shadow: none; margin-bottom: 16px; }
.setting-row { display: flex; justify-content: space-between; align-items: center; gap: 25px; padding: 13px 0; }
.setting-row + .setting-row { border-top: 1px solid var(--line); }
.setting-row select { border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; background: white; }
.toast { position: fixed; left: 50%; bottom: 35px; transform: translate(-50%, 30px); opacity: 0; background: #27332b; color: white; padding: 11px 18px; border-radius: 999px; transition: .2s; pointer-events: none; z-index: 20; }
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.mobile-nav { display: none; }

@media (max-width: 760px) {
  .app-shell { display: block; }
  .sidebar { display: none; }
  main { width: calc(100% - 28px); padding: 26px 0 100px; }
  .page-head { align-items: start; }
  h1 { font-size: 27px; }
  .today-card { padding: 26px 22px; }
  .today-card::after { font-size: 54px; right: 4%; top: 8%; }
  .today-card h2 { font-size: 30px; max-width: 85%; }
  .small-card-grid, .stats-grid { grid-template-columns: 1fr; gap: 10px; }
  .small-card { display: flex; align-items: center; justify-content: space-between; }
  .small-card strong { order: 2; margin: 0; font-size: 21px; }
  .lesson-card { min-height: calc(100vh - 130px); border-radius: 18px; padding: 28px 22px; }
  .text-pair { grid-template-columns: 1fr; }
  .text-panel { padding: 18px; }
  .choice-grid { grid-template-columns: 1fr; }
  .lesson-row { padding: 16px; grid-template-columns: 28px 1fr; }
  .lesson-row small { grid-column: 2; }
  .mobile-nav {
    position: fixed; display: grid; grid-template-columns: repeat(3, 1fr); bottom: 0; left: 0; right: 0;
    padding: 8px 8px calc(8px + env(safe-area-inset-bottom)); background: rgba(251,252,248,.94);
    backdrop-filter: blur(18px); border-top: 1px solid var(--line); z-index: 10;
  }
  .mobile-nav .nav-btn { justify-content: center; flex-direction: column; gap: 2px; padding: 7px; font-size: 11px; text-align: center; }
  .mobile-nav .nav-icon { font-size: 17px; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }