/* ===== 设计变量（古典雅致·水墨风） ===== */
:root {
  --paper: #f5f1e8;
  --paper-deep: #ece4d4;
  --ink: #1f1b16;
  --ink-soft: #3a362f;
  --muted: #6b6354;
  --cinnabar: #9e3d2f;
  --cinnabar-deep: #7e2f23;
  --dai: #3f5a52;
  --line: rgba(31, 27, 22, 0.14);
  --line-soft: rgba(31, 27, 22, 0.08);
  --shadow: 0 14px 40px rgba(31, 27, 22, 0.10);
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", "Source Han Serif SC", serif;
  --maxw: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--serif);
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at 12% 18%, rgba(158, 61, 47, 0.05) 0, transparent 38%),
    radial-gradient(circle at 88% 82%, rgba(63, 90, 82, 0.06) 0, transparent 42%);
  line-height: 1.85;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container { width: min(92%, var(--maxw)); margin: 0 auto; }

/* ===== 顶部导航 ===== */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(245, 241, 232, 0.82);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled { box-shadow: 0 6px 24px rgba(31,27,22,.08); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }

.brand { display: flex; align-items: center; gap: 12px; }
.seal {
  display: inline-flex; align-items: center; justify-content: center;
  width: 42px; height: 42px; border-radius: 6px;
  background: var(--cinnabar); color: #fff;
  font-size: 24px; font-weight: 700;
  box-shadow: 0 4px 12px rgba(158,61,47,.3);
}
.seal-sm { width: 32px; height: 32px; font-size: 18px; border-radius: 5px; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; font-size: 20px; font-weight: 700; letter-spacing: 2px; }
.brand-text small { font-size: 12px; font-weight: 400; color: var(--muted); letter-spacing: 3px; }

.nav { display: flex; gap: 34px; }
.nav a {
  position: relative; font-size: 16px; color: var(--ink-soft);
  letter-spacing: 2px; padding: 4px 0; transition: color .25s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--cinnabar); transition: width .28s ease;
}
.nav a:hover { color: var(--cinnabar); }
.nav a:hover::after { width: 100%; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 26px; height: 2px; background: var(--ink); transition: .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== 首屏 Hero ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; }
.hero-overlay { position: absolute; inset: 0; background: linear-gradient(120deg, rgba(245,241,232,.86), rgba(245,241,232,.55) 60%, rgba(245,241,232,.4)); z-index: 1; }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; padding-top: 90px; padding-bottom: 40px; }
.eyebrow { color: var(--cinnabar); letter-spacing: 4px; font-size: 15px; margin: 0 0 14px; }
.hero-name { font-size: clamp(56px, 9vw, 104px); margin: 0; line-height: 1; letter-spacing: 10px; font-weight: 700; }
.hero-title { font-size: clamp(22px, 3vw, 30px); color: var(--ink-soft); letter-spacing: 6px; margin: 14px 0 22px; }
.hero-lead { font-size: clamp(17px, 2vw, 20px); color: var(--ink-soft); margin: 0 0 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-portrait img { border-radius: 8px; box-shadow: var(--shadow); border: 6px solid #fff; }

.btn {
  display: inline-block; padding: 13px 30px; border-radius: 4px;
  font-size: 16px; letter-spacing: 2px; transition: .25s; cursor: pointer; border: 1px solid transparent;
}
.btn-primary { background: var(--cinnabar); color: #fff; }
.btn-primary:hover { background: var(--cinnabar-deep); transform: translateY(-2px); box-shadow: 0 8px 20px rgba(158,61,47,.3); }
.btn-ghost { background: transparent; border-color: var(--ink-soft); color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--cinnabar); color: var(--cinnabar); }

.scroll-hint { position: absolute; bottom: 22px; left: 50%; transform: translateX(-50%); z-index: 3; font-size: 34px; color: var(--muted); animation: bob 1.8s ease-in-out infinite; }
@keyframes bob { 0%,100% { transform: translate(-50%,0); } 50% { transform: translate(-50%,8px); } }

/* ===== 通用区块 ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--paper-deep); }
.section-head { text-align: center; margin-bottom: 56px; }
.section-index {
  display: inline-block; font-size: 18px; color: var(--cinnabar);
  border: 1px solid var(--cinnabar); border-radius: 50%; width: 44px; height: 44px;
  line-height: 42px; margin-bottom: 14px;
}
.section-title { font-size: clamp(30px, 4vw, 42px); margin: 0; letter-spacing: 6px; }
.section-sub { color: var(--muted); letter-spacing: 4px; margin: 10px 0 0; font-size: 15px; }
.block-title { font-size: 24px; letter-spacing: 3px; margin: 0 0 22px; padding-left: 14px; border-left: 4px solid var(--cinnabar); }

/* ===== 个人介绍 ===== */
.about-grid { display: grid; grid-template-columns: 320px 1fr; gap: 48px; align-items: start; }
.about-portrait img { border-radius: 8px; box-shadow: var(--shadow); border: 6px solid #fff; position: sticky; top: 90px; }
.tag-wall { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 22px; }
.tag {
  font-size: 14px; padding: 6px 14px; border: 1px solid var(--line);
  border-radius: 20px; color: var(--ink-soft); background: rgba(255,255,255,.5);
}
.about-lead { font-size: 19px; color: var(--ink); margin-top: 0; }
.about-body p { margin: 0 0 16px; color: var(--ink-soft); }
.about-body strong { color: var(--cinnabar); }

.feature-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 56px; }
.feature-card {
  background: #fff; border: 1px solid var(--line-soft); border-radius: 10px;
  padding: 30px 26px; box-shadow: var(--shadow); transition: transform .25s;
}
.feature-card:hover { transform: translateY(-6px); }
.feature-card h3 { margin: 0 0 12px; color: var(--cinnabar); letter-spacing: 2px; font-size: 21px; }
.feature-card p { margin: 0; color: var(--ink-soft); font-size: 16px; }
.feature-card strong { color: var(--dai); }

.research { margin-top: 56px; }
.research-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.research-col { background: rgba(255,255,255,.55); border: 1px solid var(--line-soft); border-radius: 10px; padding: 26px 30px; }
.research-col h4 { margin: 0 0 14px; color: var(--dai); letter-spacing: 2px; font-size: 20px; }
.research-col ul { margin: 0; padding-left: 20px; color: var(--ink-soft); }
.research-col li { margin-bottom: 8px; }

.clients { margin-top: 56px; }
.clients-note { color: var(--muted); margin: 0 0 20px; }
.client-wall { display: flex; flex-wrap: wrap; gap: 10px 14px; }
.client-wall span {
  font-size: 15px; padding: 7px 16px; border-radius: 4px;
  background: var(--paper-deep); border: 1px solid var(--line-soft); color: var(--ink-soft);
}

/* ===== 线下课程 ===== */
.courses-intro { max-width: 760px; margin: 0 auto 40px; text-align: center; color: var(--ink-soft); }
.course-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.course-card {
  background: #fff; border: 1px solid var(--line-soft); border-radius: 10px;
  padding: 26px 22px; box-shadow: var(--shadow); transition: transform .25s, border-color .25s;
  display: flex; flex-direction: column;
}
.course-card:hover { transform: translateY(-6px); border-color: var(--cinnabar); }
.course-card h3 { margin: 0 0 4px; font-size: 22px; letter-spacing: 2px; color: var(--ink); }
.course-sub { margin: 0 0 12px; color: var(--cinnabar); font-size: 14px; }
.course-desc { margin: 0 0 16px; color: var(--ink-soft); font-size: 15px; flex: 1; }
.course-tag { align-self: flex-start; font-size: 13px; color: var(--dai); border: 1px solid var(--dai); border-radius: 16px; padding: 3px 12px; }

.course-gallery { margin-top: 56px; }
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery-grid img { border-radius: 8px; box-shadow: var(--shadow); }

/* ===== 读书会 ===== */
.club-hero { max-width: 820px; margin: 0 auto 48px; text-align: center; }
.club-hero blockquote {
  font-size: clamp(22px, 3vw, 30px); color: var(--cinnabar); margin: 0 0 18px;
  letter-spacing: 2px; line-height: 1.6; position: relative; padding: 0 20px;
}
.club-hero blockquote::before, .club-hero blockquote::after { content: "“"; color: var(--line); font-size: 60px; position: absolute; }
.club-hero blockquote::before { left: -10px; top: -18px; }
.club-hero blockquote::after { content: "”"; right: -10px; bottom: -34px; }
.club-hero p { color: var(--ink-soft); }
.club-hero strong { color: var(--cinnabar); }

.book-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 48px; }
.book-card { background: var(--paper-deep); border: 1px solid var(--line); border-radius: 10px; padding: 30px; position: relative; }
.book-mark { position: absolute; top: 18px; right: 20px; font-size: 13px; color: var(--muted); letter-spacing: 2px; }
.book-card h3 { margin: 0 0 10px; font-size: 28px; letter-spacing: 3px; }
.book-bg { color: var(--dai); margin: 0 0 10px; font-size: 15px; }
.book-value { color: var(--ink-soft); margin: 0; }

.matrix { background: #fff; border: 1px solid var(--line-soft); border-radius: 10px; padding: 36px 30px; margin-bottom: 48px; text-align: center; }
.matrix-flow { display: flex; align-items: stretch; justify-content: center; flex-wrap: wrap; gap: 10px; }
.matrix-node {
  flex: 1 1 180px; max-width: 220px; border: 1px solid var(--line); border-radius: 8px;
  padding: 18px 14px; background: var(--paper); font-size: 16px; letter-spacing: 1px;
}
.matrix-node small { display: block; color: var(--muted); font-size: 13px; margin-top: 6px; }
.matrix-node.matrix-active { border-color: var(--cinnabar); background: rgba(158,61,47,.06); color: var(--cinnabar); }
.matrix-arrow { display: flex; align-items: center; color: var(--muted); font-size: 22px; }
.matrix-note { margin: 22px 0 0; color: var(--muted); font-size: 15px; }

.pricing { margin-bottom: 48px; }
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.price-card {
  background: #fff; border: 1px solid var(--line-soft); border-radius: 12px;
  padding: 30px 26px; box-shadow: var(--shadow); position: relative;
}
.price-card h4 { margin: 0 0 10px; font-size: 22px; letter-spacing: 2px; }
.price { margin: 0 0 6px; color: var(--ink); }
.price-num { font-size: 40px; font-weight: 700; color: var(--cinnabar); }
.price-for { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
.price-card ul { margin: 0; padding-left: 20px; color: var(--ink-soft); font-size: 15px; }
.price-card li { margin-bottom: 8px; }
.price-card li.muted { color: var(--muted); }
.price-featured { border: 2px solid var(--cinnabar); transform: scale(1.03); }
.price-featured .ribbon {
  position: absolute; top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--cinnabar); color: #fff; font-size: 13px; padding: 4px 16px; border-radius: 14px; letter-spacing: 2px;
}

.readplan { margin-bottom: 48px; }
.readplan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.readplan-col { background: rgba(255,255,255,.6); border: 1px solid var(--line-soft); border-radius: 10px; padding: 26px 30px; }
.readplan-col h4 { margin: 0 0 14px; color: var(--dai); letter-spacing: 1px; font-size: 18px; }
.readplan-col ul { margin: 0; padding-left: 20px; color: var(--ink-soft); font-size: 15px; }
.readplan-col li { margin-bottom: 9px; }
.readplan-col b { color: var(--cinnabar); }

.weekly { margin-bottom: 48px; }
.week-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.week-cell { background: var(--paper-deep); border: 1px solid var(--line-soft); border-radius: 8px; padding: 18px 20px; font-size: 15px; color: var(--ink-soft); }
.week-cell b { color: var(--cinnabar); margin-right: 6px; }
.week-wide { grid-column: span 3; }

.earlybird { margin-bottom: 48px; }
.eb-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.eb-card { text-align: center; background: #fff; border: 1px dashed var(--cinnabar); border-radius: 10px; padding: 26px; }
.eb-num { font-size: 44px; font-weight: 700; color: var(--cinnabar); }
.eb-unit { color: var(--muted); font-size: 16px; margin-left: 6px; }
.eb-card p { margin: 10px 0 0; color: var(--ink-soft); font-size: 15px; }

.club-cta { text-align: center; background: var(--ink); color: var(--paper); border-radius: 12px; padding: 44px 30px; }
.club-cta p { font-size: 19px; margin: 0 0 24px; letter-spacing: 1px; }
.club-cta .btn-primary { background: var(--cinnabar); }

/* ===== 联系我们 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 360px; gap: 48px; align-items: center; }
.contact-list { list-style: none; padding: 0; margin: 0 0 22px; }
.contact-list li { display: flex; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line-soft); }
.c-label { flex: 0 0 70px; color: var(--cinnabar); letter-spacing: 2px; }
.c-value { color: var(--ink-soft); }
.contact-tip { color: var(--muted); }
.contact-qr { text-align: center; }
.contact-qr img { width: 240px; margin: 0 auto 12px; border-radius: 8px; box-shadow: var(--shadow); }
.contact-qr p { color: var(--muted); font-size: 14px; }

/* ===== 页脚 ===== */
.site-footer { background: var(--ink); color: var(--paper); padding: 40px 0; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 14px; text-align: center; }
.footer-brand { display: flex; align-items: center; gap: 10px; letter-spacing: 2px; }
.footer-copy { margin: 0; color: rgba(245,241,232,.6); font-size: 14px; letter-spacing: 1px; }

/* ===== 滚动揭示动画 ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 30px; }
  .hero-portrait { max-width: 320px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-portrait img { position: static; max-width: 320px; }
  .feature-cards { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: repeat(2, 1fr); }
  .price-grid { grid-template-columns: 1fr; }
  .price-featured { transform: none; }
  .readplan-grid, .research-grid, .book-cards, .eb-grid, .contact-grid { grid-template-columns: 1fr; }
  .week-grid { grid-template-columns: 1fr; }
  .week-wide { grid-column: span 1; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .matrix-arrow { transform: rotate(90deg); }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  .nav { position: fixed; top: 68px; left: 0; right: 0; flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px 0;
    transform: translateY(-120%); transition: transform .3s ease; box-shadow: var(--shadow); }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 24px; border-bottom: 1px solid var(--line-soft); }
  .nav-toggle { display: flex; }
  .section { padding: 64px 0; }
  .course-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .matrix-node { flex-basis: 100%; max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== 子页通用（多页结构） ===== */
.subpage-banner {
  margin-top: 68px;
  padding: 72px 0 56px;
  background:
    linear-gradient(180deg, rgba(31,27,22,.04), transparent 70%),
    radial-gradient(circle at 80% 20%, rgba(158,61,47,.08), transparent 55%);
  border-bottom: 1px solid var(--line-soft);
  text-align: center;
}
.subpage-banner .crumb {
  margin: 0 0 18px;
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--muted);
}
.subpage-banner .crumb a { color: var(--cinnabar); }
.subpage-banner .crumb a:hover { text-decoration: underline; }
.subpage-banner .section-index {
  display: inline-flex; align-items: center; justify-content: center;
  width: 64px; height: 64px; border-radius: 50%;
  border: 2px solid var(--cinnabar);
  color: var(--cinnabar); font-size: 30px; font-weight: 700;
  margin-bottom: 16px;
}
.subpage-title {
  font-size: clamp(30px, 5vw, 46px);
  letter-spacing: 6px;
  margin: 0 0 10px;
  font-weight: 700;
}
.subpage-sub {
  margin: 0;
  color: var(--muted);
  letter-spacing: 3px;
  font-size: 16px;
}
.subpage { padding-top: 56px; }
.page-actions {
  display: flex; flex-wrap: wrap; gap: 16px;
  margin-top: 48px;
  justify-content: center;
}

/* 首页板块导航卡片 */
.chapters { background: transparent; }
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.chapter-card {
  position: relative;
  display: block;
  padding: 34px 32px 30px;
  background: #fff;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
  overflow: hidden;
}
.chapter-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: var(--cinnabar); opacity: .85;
}
.chapter-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 50px rgba(31,27,22,.14);
  border-color: var(--cinnabar);
}
.chapter-index {
  display: inline-block;
  font-size: 15px; letter-spacing: 2px;
  color: var(--cinnabar);
  border: 1px solid var(--cinnabar);
  border-radius: 4px;
  padding: 2px 10px;
  margin-bottom: 14px;
}
.chapter-card h3 { margin: 0 0 12px; font-size: 24px; letter-spacing: 2px; }
.chapter-card p { margin: 0 0 18px; color: var(--ink-soft); font-size: 15.5px; line-height: 1.8; }
.chapter-go { color: var(--cinnabar); font-size: 15px; letter-spacing: 1px; font-weight: 700; }

@media (max-width: 760px) {
  .chapter-grid { grid-template-columns: 1fr; }
  .subpage-banner { padding: 54px 0 42px; }
}