/* ===== 传习录 Chuanxi Lu — Shared Stylesheet ===== */

/* Reset & Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f5f0e8;--bg2:#faf7f2;--bg3:#fffef9;
  --text:#2c2520;--text2:#5a5347;--text3:#8a8279;
  --gold:#9a7b2f;--gold2:#b8922a;--gold-dim:#a89060;
  --red:#b44;--accent:#6a8a7a;
  --border:#e0d8cc;
  --radius:12px;--radius-sm:8px;
}
html{scroll-behavior:smooth;font-size:16px}
body{
  font-family:"Noto Serif SC","Source Han Serif SC","SimSun",serif;
  background:var(--bg);color:var(--text);
  line-height:1.8;min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--gold);text-decoration:none;transition:color .2s}
a:hover{color:var(--gold2)}
img{max-width:100%;display:block}
::selection{background:#9a7b2f;color:#fff}

/* Layout */
.container{max-width:1100px;margin:0 auto;padding:0 24px}
.container-narrow{max-width:800px;margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-title{
  font-size:1.1rem;letter-spacing:.15em;text-transform:uppercase;
  color:var(--gold-dim);margin-bottom:12px;font-weight:400;
}
.section h2{
  font-size:2.2rem;color:var(--text);font-weight:600;margin-bottom:16px;
}
.section .subtitle{
  font-size:1.05rem;color:var(--text2);max-width:640px;line-height:1.9;
}

/* ===== Top Nav ===== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  background:rgba(245,240,232,.95);backdrop-filter:blur(12px);
  border-bottom:1px solid #e8e0d4;
}
.topbar-inner{
  max-width:1100px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;
  height:56px;
}
.logo{
  display:flex;align-items:center;gap:8px;
  font-size:1.1rem;color:#7a6020;font-weight:600;
}
.logo .yin-yang{font-size:1.4rem}
.nav-links{display:flex;gap:24px;font-size:.88rem;color:var(--text3)}
.nav-links a{color:var(--text3);transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--gold)}
.lang-switch{display:flex;gap:8px;font-size:.82rem}
.lang-switch a{
  padding:3px 10px;border-radius:4px;color:var(--text3);
  border:1px solid transparent;transition:all .2s;
}
.lang-switch a:hover{color:#2c2520;border-color:#d0c8b8}
.lang-switch a.active{color:#7a6020;border-color:#b8a070}
.menu-btn{
  display:none;background:none;border:none;color:var(--text2);
  font-size:1.4rem;cursor:pointer;
}

/* ===== Hero ===== */
.hero{
  padding:120px 0 60px;text-align:center;
  background:linear-gradient(180deg,#f5f0e8 0%,#faf7f2 100%);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:50%;left:50%;
  width:600px;height:600px;
  transform:translate(-50%,-50%);
  background:radial-gradient(circle,rgba(154,123,47,.08) 0%,transparent 70%);
  pointer-events:none;
}
.hero-badge{
  display:inline-block;padding:4px 16px;
  border:1px solid var(--gold-dim);border-radius:20px;
  font-size:.78rem;color:var(--gold);letter-spacing:.1em;
  margin-bottom:24px;
}
.hero h1{
  font-size:3.2rem;font-weight:700;color:var(--text);
  margin-bottom:8px;letter-spacing:.08em;
}
.hero h1 .roman{
  font-size:1.6rem;font-weight:400;color:var(--text2);
  display:block;margin-top:4px;letter-spacing:.06em;
}
.hero .author{font-size:1.1rem;color:var(--text2);margin-bottom:32px}
.hero .desc{
  font-size:1.05rem;color:var(--text2);max-width:600px;
  margin:0 auto 40px;line-height:2;
}
.stats{display:flex;justify-content:center;gap:48px;flex-wrap:wrap}
.stat{text-align:center}
.stat .num{font-size:2.4rem;font-weight:700;color:var(--gold);line-height:1.2}
.stat .label{font-size:.82rem;color:var(--text3);margin-top:4px;letter-spacing:.05em}

/* ===== About ===== */
.about-section{
  background:#faf7f2;border-top:1px solid #e8e0d4;border-bottom:1px solid #e8e0d4;
}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.about-text p{color:var(--text2);margin-bottom:16px;line-height:1.9}
.about-meta{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}
.meta-card{
  padding:20px;background:var(--bg3);border-radius:var(--radius-sm);
  border:1px solid var(--border);text-align:center;
}
.meta-card .val{font-size:1.6rem;color:var(--gold);font-weight:600}
.meta-card .lbl{font-size:.82rem;color:var(--text3);margin-top:4px}

/* ===== Core Concepts ===== */
.concepts-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:16px;margin-top:32px;
}
.concept-card{
  padding:20px;background:var(--bg2);border-radius:var(--radius-sm);
  border:1px solid #e0d8cc;box-shadow:0 1px 4px rgba(0,0,0,.04);
  text-align:center;transition:border-color .3s,transform .3s;cursor:default;
}
.concept-card:hover{border-color:var(--gold-dim);transform:translateY(-2px)}
.concept-char{font-size:2rem;color:var(--gold);margin-bottom:8px;line-height:1.2}
.concept-name{font-size:.82rem;color:var(--text2);margin-bottom:4px}
.concept-ref{font-size:.75rem;color:var(--text3)}

/* ===== Chapter Index ===== */
.chapter-grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));
  gap:16px;margin-top:32px;
}
.chapter-card{
  display:flex;align-items:flex-start;gap:16px;
  padding:20px;background:var(--bg2);border-radius:var(--radius-sm);
  border:1px solid #e0d8cc;box-shadow:0 1px 4px rgba(0,0,0,.04);
  transition:border-color .3s,transform .3s;
}
.chapter-card:hover{border-color:var(--gold-dim);transform:translateY(-2px)}
.chapter-card .ch-num{
  flex-shrink:0;width:48px;height:48px;
  display:flex;align-items:center;justify-content:center;
  border-radius:50%;border:1px solid var(--gold-dim);
  font-size:1.2rem;color:var(--gold);font-weight:600;
}
.chapter-card .ch-body{flex:1;min-width:0}
.chapter-card .ch-title{
  font-size:1rem;color:var(--text);font-weight:600;margin-bottom:4px;
}
.chapter-card .ch-subtitle{
  font-size:.85rem;color:var(--text2);margin-bottom:6px;line-height:1.6;
}
.chapter-card .ch-tags{display:flex;gap:6px;flex-wrap:wrap}
.chapter-card .ch-tag{
  font-size:.7rem;padding:2px 8px;
  border-radius:10px;border:1px solid var(--border);color:var(--text3);
}
.chapter-card a{display:block;text-decoration:none;color:inherit}

/* ===== Explore ===== */
.explore-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px}
.explore-card{
  padding:28px;background:var(--bg2);border-radius:var(--radius-sm);
  border:1px solid #e0d8cc;box-shadow:0 1px 4px rgba(0,0,0,.04);
  transition:border-color .3s;
}
.explore-card:hover{border-color:var(--gold-dim)}
.explore-icon{font-size:1.6rem;margin-bottom:12px}
.explore-card h3{font-size:1rem;color:var(--text);margin-bottom:8px}
.explore-card p{font-size:.85rem;color:var(--text2);line-height:1.7}

/* ===== Article (Chapter Detail) ===== */
.breadcrumb{
  padding:80px 0 20px;font-size:.82rem;color:var(--text3);
}
.breadcrumb a{color:var(--text3)}
.breadcrumb a:hover{color:var(--gold)}
.breadcrumb span{margin:0 8px}

.article-header{
  text-align:center;padding:0 0 40px;
  border-bottom:1px solid #e0d8cc;margin-bottom:48px;
}
.article-header .ch-label{
  font-size:.85rem;color:var(--gold-dim);letter-spacing:.1em;margin-bottom:8px;
}
.article-header h1{
  font-size:2.4rem;font-weight:700;color:var(--text);margin-bottom:8px;
}
.article-header .ch-sub{
  font-size:1.1rem;color:var(--text2);margin-bottom:20px;
}
.article-header .ch-quote{
  font-size:1rem;color:var(--text2);font-style:italic;
  max-width:560px;margin:0 auto;line-height:1.9;
}
.concept-badges{
  display:flex;justify-content:center;gap:8px;margin-top:20px;flex-wrap:wrap;
}
.concept-badge{
  padding:4px 14px;border-radius:16px;
  border:1px solid var(--gold-dim);font-size:.78rem;color:var(--gold);letter-spacing:.05em;
}

/* Tabs */
.tabs{
  display:flex;gap:4px;margin-bottom:32px;
  border-bottom:1px solid #e0d8cc;overflow-x:auto;
}
.tab-btn{
  padding:10px 18px;font-size:.85rem;color:var(--text3);
  cursor:pointer;border:none;background:none;
  border-bottom:2px solid transparent;transition:all .2s;
  white-space:nowrap;font-family:inherit;
}
.tab-btn:hover{color:var(--text2)}
.tab-btn.active{color:var(--gold);border-bottom-color:var(--gold)}
.tab-content{display:none}
.tab-content.active{display:block}

/* Content blocks */
.content-block{margin-bottom:40px}
.content-block h3{
  font-size:1.15rem;color:var(--gold);margin-bottom:16px;
  padding-bottom:8px;border-bottom:1px solid #e0d8cc;
}
.original-text{
  font-size:1.2rem;line-height:2.2;color:var(--text);letter-spacing:.04em;
}
.original-text p{margin-bottom:16px}
.translation{font-size:1rem;color:var(--text2);line-height:2}
.translation p{margin-bottom:16px}
.annotation-table{width:100%;border-collapse:collapse;margin-top:16px}
.annotation-table th,.annotation-table td{
  padding:10px 14px;text-align:left;
  border-bottom:1px solid #e0d8cc;font-size:.9rem;
}
.annotation-table th{
  color:var(--gold-dim);font-weight:500;font-size:.82rem;letter-spacing:.05em;
}
.annotation-table td{color:var(--text2)}
.annotation-table td:first-child{color:var(--text);font-weight:500}
.commentary{font-size:.95rem;color:var(--text2);line-height:2}
.commentary p{margin-bottom:16px}
.commentary strong{color:var(--text)}

/* Misconception */
.misconception{
  padding:16px 20px;background:var(--bg3);border-radius:var(--radius-sm);
  border-left:3px solid var(--red);margin-bottom:16px;
}
.misconception .wrong{color:var(--red);font-size:.88rem;margin-bottom:4px}
.misconception .right{color:var(--accent);font-size:.88rem}

/* Application */
.application{
  padding:20px;background:var(--bg2);border-radius:var(--radius-sm);
  border:1px solid var(--border);margin-bottom:16px;
}
.application .scene{font-size:.82rem;color:var(--gold-dim);margin-bottom:8px;letter-spacing:.05em}
.application p{font-size:.9rem;color:var(--text2);line-height:1.8}

/* Scholar notes */
.scholar-note{
  padding:16px 20px;background:var(--bg2);border-radius:var(--radius-sm);
  border:1px solid var(--border);margin-bottom:12px;
}
.scholar-note .name{font-size:.88rem;color:var(--gold);margin-bottom:4px}
.scholar-note .period{font-size:.78rem;color:var(--text3);margin-bottom:8px}
.scholar-note blockquote{
  font-size:.9rem;color:var(--text2);font-style:italic;
  border-left:2px solid var(--gold-dim);padding-left:12px;margin-bottom:8px;
}
.scholar-note .interpretation{font-size:.85rem;color:var(--text3)}

/* Page navigation */
.page-nav{
  display:flex;justify-content:space-between;
  margin-top:60px;padding-top:32px;border-top:1px solid #e0d8cc;
}
.page-nav a{font-size:.88rem;color:var(--text3);transition:color .2s}
.page-nav a:hover{color:var(--gold)}
.page-nav .label{font-size:.75rem;display:block;margin-bottom:6px;color:var(--text3);text-transform:uppercase;letter-spacing:.08em;border-bottom:1px solid var(--border);padding-bottom:4px}

/* ===== Footer ===== */
.footer{
  padding:40px 0;border-top:1px solid #e0d8cc;
  text-align:center;color:var(--text3);font-size:.82rem;
}
.footer-links{
  display:flex;justify-content:center;gap:24px;margin-bottom:16px;flex-wrap:wrap;
}
.footer-links a{color:var(--text3);font-size:.82rem}
.footer-links a:hover{color:var(--gold)}

/* ===== Responsive ===== */
@media(max-width:768px){
  .menu-btn{display:block}
  .nav-links{
    display:none;position:absolute;top:56px;left:0;right:0;
    background:rgba(245,240,232,.96);flex-direction:column;
    padding:16px 24px;gap:12px;border-bottom:1px solid #e8e0d4;
  }
  .nav-links.open{display:flex}
  .lang-switch{margin-left:0}
  .hero h1{font-size:2.2rem}
  .stats{gap:24px}
  .about-grid{grid-template-columns:1fr}
  .explore-grid{grid-template-columns:1fr}
  .chapter-grid{grid-template-columns:1fr}
  .article-header h1{font-size:1.8rem}
  .tabs{gap:0}
  .tab-btn{padding:8px 12px;font-size:.78rem}
  .page-nav{flex-direction:column;gap:16px}
}