:root {
  color-scheme: light;
  --paper: #f6f1e6;
  --ink: #27231e;
  --muted: #746d61;
  --line: rgba(39, 35, 30, 0.16);
  --accent: #3f6b50;
  --gold: #9a5f1f;
  --white: rgba(255, 252, 244, 0.78);
  --serif-zh: "Songti SC", "Noto Serif CJK SC", "STSong", serif;
  --kai-zh: "Kaiti SC", "STKaiti", "KaiTi", "BiauKai", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-zh);
  line-height: 1.8;
}

a { color: inherit; text-decoration: none; }

.nav-bar {
  min-height: 58px;
  padding: 12px clamp(18px, 4vw, 52px);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
}

.home { color: var(--ink); font-weight: 650; }

.hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: clamp(42px, 8vw, 86px) 22px 30px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(20px, 5vw, 46px);
  align-items: center;
}

.hero-symbol {
  display: grid;
  justify-items: center;
}

.taiji-mark {
  --taiji-size: 76px;
  position: relative;
  width: var(--taiji-size);
  height: var(--taiji-size);
  border: 2px solid var(--ink);
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 25%, var(--paper) 0 6px, var(--ink) 7px 12px, transparent 13px),
    radial-gradient(circle at 50% 75%, var(--ink) 0 6px, var(--paper) 7px 12px, transparent 13px),
    linear-gradient(to right, var(--ink) 0 50%, var(--paper) 50% 100%);
  box-shadow: 0 8px 18px rgba(39, 35, 30, 0.10);
}

.taiji-mark::before,
.taiji-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  width: calc(var(--taiji-size) / 2);
  height: calc(var(--taiji-size) / 2);
  border-radius: 50%;
  transform: translateX(-50%);
}

.taiji-mark::before {
  top: 0;
  background: var(--ink);
}

.taiji-mark::after {
  bottom: 0;
  background: var(--paper);
}

.taiji-mark span {
  position: absolute;
  left: 50%;
  z-index: 1;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transform: translateX(-50%);
}

.taiji-mark span:first-child {
  top: 14px;
  background: var(--paper);
}

.taiji-mark span:last-child {
  bottom: 14px;
  background: var(--ink);
}

.seal {
  width: 104px;
  height: 104px;
  border: 2px solid var(--gold);
  color: var(--gold);
  display: grid;
  place-items: center;
  text-align: center;
  line-height: 1.15;
  font-size: 34px;
  font-weight: 700;
}

.taiji-seal {
  background: rgba(255, 252, 244, 0.82);
}

.zhuang-seal {
  background: rgba(255, 252, 244, 0.82);
  font-family: var(--kai-zh);
  letter-spacing: 0;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(44px, 9vw, 96px);
  line-height: 1.05;
  font-weight: 500;
}

.subtitle {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 22px);
}

.directory-head,
.chapter-index {
  width: min(1120px, calc(100% - 32px));
}

.directory-head {
  margin: 34px auto 14px;
}

.directory-head h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
  font-weight: 500;
}

.directory-head p:last-child {
  max-width: 680px;
  margin: 10px 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.75;
}

.chapter-index {
  margin: 0 auto 56px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 12px;
  align-items: stretch;
}

.chapter-card {
  min-height: 184px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 18px;
  background: var(--white);
  display: grid;
  grid-template-rows: auto auto auto 1fr;
  gap: 4px;
  overflow: hidden;
}

.chapter-card:hover { border-color: rgba(47, 111, 115, 0.46); }

.chapter-no {
  color: var(--gold);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
}

.chapter-title { font-size: 24px; line-height: 1.25; }

.chapter-section {
  color: var(--accent);
  font-family: var(--sans);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chapter-summary {
  margin-top: 8px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.source-line {
  max-width: 760px;
  margin: 18px 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
}

.source-line a,
.chapter-source a,
.side-note a { color: var(--accent); }

.overview-band {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(255, 252, 244, 0.38);
}

.overview-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 38px 0 42px;
  display: grid;
  grid-template-columns: minmax(260px, 0.66fr) minmax(0, 1.34fr);
  gap: clamp(24px, 5vw, 54px);
  align-items: start;
}

.overview-lead h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.16;
  font-weight: 500;
}

.overview-lead p:last-child {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.9;
}

.overview-flow {
  list-style: none;
  margin: 0;
  padding: 2px 0 0;
  display: grid;
  gap: 18px;
}

.overview-flow li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.overview-flow li > span {
  width: 30px;
  height: 30px;
  border: 1px solid rgba(166, 111, 27, 0.42);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--gold);
  font-family: var(--serif-zh);
  font-size: 15px;
  line-height: 1;
  background: rgba(255, 252, 244, 0.58);
}

.overview-flow h3 {
  margin: 0 0 6px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 15px;
}

.overview-flow p {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.82;
}

.site-foot,
.chapter-nav {
  border-top: 1px solid var(--line);
  padding: 22px;
  color: var(--muted);
  text-align: center;
  font-family: var(--sans);
  font-size: 13px;
}

.chapter-head {
  max-width: 860px;
  margin: 0 auto;
  padding: 46px 22px 18px;
}

.chapter-head h1 { font-size: clamp(38px, 7vw, 72px); }

.reader-layout {
  width: min(1160px, calc(100% - 32px));
  margin: 0 auto 48px;
  display: grid;
  grid-template-columns: minmax(0, 820px) 280px;
  gap: 34px;
  align-items: start;
}

.reader {
  width: min(860px, calc(100% - 32px));
  margin: 0;
}

.reading-block {
  border-top: 1px solid var(--line);
  padding: 26px 0;
}

.reading-block h2 {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 17px;
}

.reading-block p { margin: 0; font-size: 20px; }

.reading-block p + p { margin-top: 12px; }

.classic-block,
.vernacular-block,
.paragraph-reading-block,
.terms-block,
.deep-reading,
.review-block {
  border: 1px solid var(--line);
  border-radius: 0 8px 8px 0;
  margin: 0 0 18px;
  padding: 22px 24px;
}

.classic-block {
  border-left: 5px solid var(--gold);
  background:
    linear-gradient(180deg, rgba(255, 252, 244, 0.94), rgba(245, 238, 221, 0.72)),
    var(--paper);
  box-shadow: 0 10px 22px rgba(39, 35, 30, 0.08);
}

.vernacular-block {
  border-left: 5px solid var(--accent);
  background: rgba(246, 249, 247, 0.70);
  font-family: var(--sans);
}

.paragraph-reading-block {
  border-left: 5px solid rgba(63, 107, 80, 0.78);
  background: rgba(255, 252, 244, 0.64);
}

.classic-block h2,
.vernacular-block h2,
.paragraph-reading-block h2 {
  display: flex;
  align-items: center;
  gap: 12px;
}

.classic-block h2::after,
.vernacular-block h2::after,
.paragraph-reading-block h2::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

.classic-block p {
  font-family: var(--kai-zh);
  font-size: 21px;
  line-height: 2.05;
}

.classic-with-terms {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(230px, 280px);
  gap: 24px;
  align-items: start;
}

.classic-text {
  min-width: 0;
  font-family: var(--kai-zh);
}

.terms-aside {
  border-left: 1px solid rgba(166, 111, 27, 0.32);
  padding-left: 18px;
}

.terms-aside h3 {
  margin: 0 0 12px;
  color: var(--gold);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
}

.vernacular-block p {
  position: relative;
  padding-left: 14px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.9;
}

.vernacular-block p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  bottom: 0.55em;
  width: 3px;
  background: rgba(47, 111, 115, 0.28);
  border-radius: 99px;
}

.paragraph-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.paragraph-item {
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.paragraph-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.paragraph-label {
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
}

.paragraph-label a {
  color: var(--gold);
  font-size: 12px;
}

.paragraph-source {
  margin: 0 !important;
  color: var(--gold);
  font-family: var(--kai-zh);
  font-size: 19px !important;
  line-height: 1.75;
}

.paragraph-note {
  margin: 8px 0 0 !important;
  color: var(--ink);
  font-family: var(--serif-zh);
  font-size: 18px !important;
  line-height: 1.85;
}

/* 导读 banner */
.chapter-intro {
  border: 1px solid var(--line);
  border-left: 5px solid var(--gold);
  border-radius: 0 8px 8px 0;
  margin: 0 0 18px;
  padding: 16px 20px;
  background: rgba(255, 252, 244, 0.7);
  font-family: var(--kai-zh);
  font-size: 19px;
  line-height: 1.95;
}

.chapter-intro strong {
  display: inline-block;
  margin-right: 12px;
  color: var(--gold);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  vertical-align: 1px;
}

/* 原文 · 白话解读 交替排布 */
.interleaved-block {
  border-left: 5px solid var(--gold);
  background: rgba(255, 253, 248, 0.9);
  box-shadow: 0 10px 22px rgba(39, 35, 30, 0.06);
}

.interleaved-block h2 {
  display: flex;
  align-items: center;
  gap: 12px;
}

.interleaved-block h2::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

.seg-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 30px;
}

.seg-head {
  margin-bottom: 8px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--sans);
  font-size: 13px;
}

.seg-no {
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.seg-name {
  color: var(--accent);
  font-weight: 700;
}

.seg-head a {
  margin-left: auto;
  color: var(--gold);
  font-size: 12px;
}

/* 正文：大一号字体 + 暖金色 box */
.seg-source {
  margin: 0 !important;
  padding: 18px 22px;
  border: 1px solid rgba(154, 95, 31, 0.3);
  border-left: 5px solid var(--gold);
  border-radius: 0 8px 8px 0;
  background:
    linear-gradient(180deg, rgba(252, 244, 228, 0.95), rgba(247, 237, 216, 0.78));
  box-shadow: 0 4px 12px rgba(154, 95, 31, 0.07);
  font-family: var(--kai-zh);
  font-size: 24px !important;
  line-height: 2.05;
  color: var(--ink);
}

/* 白话解读：小一号字体 + 冷绿色 box */
.seg-note {
  margin-top: 10px;
  padding: 16px 20px;
  border: 1px solid rgba(63, 107, 80, 0.22);
  border-left: 5px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: rgba(238, 246, 241, 0.8);
}

.seg-note > b {
  display: inline-block;
  margin-bottom: 4px;
  padding: 1px 10px;
  border-radius: 99px;
  background: rgba(63, 107, 80, 0.12);
  color: var(--accent);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.1em;
}

.seg-note-body { display: block; }

.seg-note-body p {
  margin: 0 !important;
  font-family: var(--sans);
  font-size: 15.5px !important;
  line-height: 1.95;
  color: var(--ink);
}

.seg-note-body p + p { margin-top: 10px !important; }

@media (max-width: 720px) {
  .seg-source { font-size: 21px !important; padding: 14px 16px; }
  .seg-note { padding: 13px 15px; }
}

/* 重点词语、典故 下划线 */
u.kw {
  text-decoration: none;
  background: linear-gradient(180deg, transparent 62%, rgba(154, 95, 31, 0.22) 62%);
  border-bottom: 1.5px solid rgba(154, 95, 31, 0.62);
  padding: 0 1px;
}

.term-grid-wide {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* 名句传世 */
.famous-block {
  border-left: 5px solid var(--gold);
  background: rgba(255, 252, 244, 0.66);
}

.famous-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.famous-item {
  border-top: 1px dashed rgba(154, 95, 31, 0.3);
  padding-top: 14px;
}

.famous-item:first-child {
  border-top: 0;
  padding-top: 2px;
}

.famous-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
}

.famous-line {
  margin: 0 !important;
  color: var(--gold);
  font-family: var(--kai-zh);
  font-size: 21px !important;
  line-height: 1.7;
  letter-spacing: 0.02em;
}

.famous-idiom {
  align-self: center;
  border: 1px solid rgba(154, 95, 31, 0.42);
  border-radius: 99px;
  padding: 2px 12px;
  color: var(--gold);
  font-family: var(--sans);
  font-size: 13px;
  white-space: nowrap;
}

.famous-note {
  margin: 8px 0 0 !important;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px !important;
  line-height: 1.9;
}

.placeholder { color: var(--muted); }

.chapter-source {
  margin-top: 14px !important;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 13px !important;
}

.term-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 9px;
}

.term-item {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 11px 12px;
  background: var(--white);
}

.term-name {
  display: block;
  color: var(--gold);
  font-size: 22px;
  line-height: 1.3;
}

.term-desc {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.deep-reading p {
  font-family: var(--serif-zh);
  font-size: 19px;
}

.review-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 14px;
}

.review-list li {
  border-left: 3px solid var(--gold);
  padding: 6px 0 7px 14px;
}

.reviewer {
  display: block;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
}

.review-text {
  display: block;
  margin-top: 6px;
  font-family: var(--serif-zh);
  font-size: 17px;
  line-height: 1.75;
}

.review-quote {
  display: block;
  margin-top: 6px;
  color: var(--gold);
  font-family: var(--kai-zh);
  font-size: 20px;
  line-height: 1.65;
}

.review-source {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
}

.review-source a { color: var(--accent); }

.reader-aside {
  position: sticky;
  top: 18px;
}

.side-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: var(--white);
}

.side-panel h3 {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: 15px;
}

.side-item {
  border-top: 1px solid var(--line);
  padding: 10px 0;
}

.side-item span {
  display: block;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
}

.side-item b {
  display: block;
  margin-top: 2px;
  font-size: 18px;
  font-weight: 500;
}

.side-item a {
  color: var(--accent);
}

.side-note {
  border-top: 1px solid var(--line);
  padding-top: 12px;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 12px;
  line-height: 1.65;
}

ruby rt {
  font-family: var(--sans);
  font-size: 0.58em;
  color: var(--muted);
}

.chapter-nav {
  display: flex;
  justify-content: center;
  gap: 28px;
}

@media (max-width: 1020px) {
  .reader-layout { grid-template-columns: 1fr; }
  .reader {
    width: 100%;
    max-width: 860px;
  }
  .reader-aside {
    position: static;
    max-width: 860px;
  }
}

@media (max-width: 720px) {
  .hero { grid-template-columns: 1fr; }
  .overview-inner { grid-template-columns: 1fr; }
  .seal { width: 84px; height: 84px; font-size: 28px; }
  .taiji-mark { --taiji-size: 62px; }
  .taiji-mark span:first-child { top: 11px; }
  .taiji-mark span:last-child { bottom: 11px; }
  .nav-bar { align-items: flex-start; flex-direction: column; }
  .classic-with-terms { grid-template-columns: 1fr; }
  .terms-aside {
    border-left: 0;
    border-top: 1px solid rgba(166, 111, 27, 0.32);
    padding: 16px 0 0;
  }
  .classic-block,
  .vernacular-block,
  .paragraph-reading-block,
  .terms-block,
  .deep-reading,
  .review-block { padding: 18px 16px; }
  .classic-block p { font-size: 21px; }
}