:root {
  /* 禅意科技：暖墨黑底 + 暗金主色 + 朱砂点睛 + 黛青微光 */
  --bg: #0b0a08;
  --bg-2: #12100b;
  --card: rgba(30, 26, 20, 0.72);
  --card-solid: #1a1610;
  --border: rgba(201, 168, 106, 0.18);
  --text: #eae4d8;
  --text-dim: #9a9080;
  --cyan: #c9a86a;   /* 兜底：暗金 */
  --green: #a63a2e;  /* 兜底：朱砂 */
  --gold: #c9a86a;
  --gold-soft: #e2cb96;
  --cinnabar: #a63a2e;
  --cinnabar-bright: #c2483a;
  --dai: #5a7d84;
  --ink: #17120a;    /* 金底上的墨字 */
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif SC", "Source Han Serif SC", "Georgia", serif;
  --radius: 16px;
  --maxw: 1080px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  background:
    radial-gradient(1100px 560px at 86% -8%, rgba(201, 168, 106, 0.10), transparent 60%),
    radial-gradient(820px 480px at -8% 12%, rgba(166, 58, 46, 0.06), transparent 55%),
    radial-gradient(720px 720px at 52% 118%, rgba(90, 125, 132, 0.06), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; flex: 1; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  background: rgba(11, 10, 8, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo { width: 38px; height: 38px; border-radius: 10px; box-shadow: 0 0 16px rgba(201,168,106,.35); transition: box-shadow .25s ease; }
.brand-text { font-weight: 800; font-size: 18px; letter-spacing: 0.5px; display: flex; flex-direction: column; line-height: 1.1; }
.brand-sub { font-size: 11px; font-weight: 600; color: var(--gold); letter-spacing: 2px; }
.nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav a {
  padding: 8px 14px; border-radius: 10px; color: var(--text-dim);
  font-size: 14px; font-weight: 600; transition: all .2s ease;
}
.nav a:hover { color: var(--text); background: rgba(201,168,106,.08); }
.nav a.active { color: var(--ink); background: linear-gradient(120deg, var(--gold), var(--gold-soft)); }

/* ---------- Hero ---------- */
.hero {
  padding: 84px 0 48px; text-align: center;
}
.hero .eyebrow {
  display: inline-block; font-size: 13px; letter-spacing: 3px; color: var(--gold);
  border: 1px solid rgba(201,168,106,.35); border-radius: 999px; padding: 6px 16px; margin-bottom: 22px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(30px, 6vw, 54px); line-height: 1.25; font-weight: 900; letter-spacing: 2px;
  background: linear-gradient(110deg, #f5eeda 20%, var(--gold) 55%, var(--cinnabar-bright) 95%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { max-width: 720px; margin: 22px auto 0; color: var(--text-dim); font-size: 17px; }
.hero-actions { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 24px; border-radius: 12px; font-weight: 700; font-size: 15px; cursor: pointer;
  border: 1px solid transparent; transition: transform .15s ease, box-shadow .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(120deg, var(--gold), var(--gold-soft)); color: var(--ink); box-shadow: 0 8px 30px rgba(201,168,106,.25); }
.btn-ghost { border-color: var(--border); color: var(--text); background: rgba(201,168,106,.04); }

/* ---------- Section ---------- */
.section { padding: 52px 0; }
.section-head { margin-bottom: 28px; }
.section-head h2 { font-family: var(--serif); font-size: 30px; font-weight: 800; letter-spacing: 1px; }
.section-head h2 .accent { color: var(--gold); }
.section-head p { color: var(--text-dim); margin-top: 8px; }

/* ---------- Cards grid ---------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; transition: transform .18s ease, border-color .2s ease, box-shadow .25s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(201,168,106,.42); box-shadow: 0 16px 40px rgba(0,0,0,.35); }
.card .tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 1px; color: var(--gold); margin-bottom: 10px; }
.card .tag.gold { color: var(--gold-soft); }
.card h3 { font-size: 19px; margin-bottom: 10px; line-height: 1.4; }
.card p { color: var(--text-dim); font-size: 15px; }
.card .meta { margin-top: 14px; font-size: 13px; color: #7d7263; }

.concept-card .icon { font-size: 26px; margin-bottom: 10px; }
.concept-card h3 { color: var(--gold-soft); font-family: var(--serif); }

/* ---------- Article list & detail ---------- */
.article-card { display: block; cursor: pointer; }
.article-card h3 { color: var(--text); font-family: var(--serif); }
.article-card .excerpt { margin-top: 6px; }

.detail { max-width: 760px; margin: 0 auto; padding: 30px 0 60px; }
.detail .back { color: var(--text-dim); font-size: 14px; display: inline-block; margin-bottom: 18px; }
.detail .back:hover { color: var(--gold); }
.detail .meta { color: #7d7263; font-size: 13px; margin-bottom: 18px; letter-spacing: .5px; }
.detail h1 { font-family: var(--serif); font-size: clamp(26px, 5vw, 38px); line-height: 1.35; margin-bottom: 8px; letter-spacing: 1px; }
.detail .lead-p { color: var(--text-dim); font-size: 17px; margin: 4px 0 8px; }
.detail h2 { font-family: var(--serif); font-size: 22px; margin: 34px 0 12px; color: var(--gold-soft); }
.detail p { color: #ddd5c5; margin: 14px 0; }
.detail blockquote {
  border-left: 3px solid var(--gold); padding: 6px 18px; margin: 22px 0;
  background: rgba(201,168,106,.07); border-radius: 0 10px 10px 0; color: var(--gold-soft); font-style: italic;
}
.detail ul { padding-left: 22px; color: #ddd5c5; margin: 14px 0; }
.detail li { margin: 8px 0; }

/* ---------- Quotes ---------- */
.quote-card { text-align: center; padding: 30px 22px; }
.quote-card .q { font-family: var(--serif); font-size: 19px; line-height: 1.8; color: var(--text); }
.quote-card .src { margin-top: 14px; color: var(--gold); font-size: 13px; letter-spacing: 1px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 60px; padding: 34px 20px; background: var(--bg-2); }
.footer-inner { max-width: var(--maxw); margin: 0 auto; display: flex; gap: 16px; align-items: center; }
.footer-logo { width: 46px; height: 46px; border-radius: 12px; }
.footer-title { font-weight: 800; }
.footer-note { color: var(--text-dim); font-size: 14px; max-width: 760px; }
.copyright { max-width: var(--maxw); margin: 18px auto 0; color: #6e6455; font-size: 13px; text-align: center; }

.fade-in { animation: fade .4s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Hero 装饰（禅意科技氛围，纯 CSS） ---------- */
.hero { position: relative; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; left: 50%; top: -160px; transform: translateX(-50%);
  width: 900px; height: 520px; max-width: 140vw; z-index: -1; pointer-events: none;
  background:
    radial-gradient(closest-side at 30% 40%, rgba(201,168,106,.16), transparent 70%),
    radial-gradient(closest-side at 70% 30%, rgba(166,58,46,.12), transparent 70%),
    radial-gradient(closest-side at 50% 60%, rgba(90,125,132,.12), transparent 70%);
  filter: blur(8px);
}
.hero::after {
  content: ""; position: absolute; inset: -10% 0 auto; height: 460px; z-index: -1; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(rgba(201,168,106,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201,168,106,.05) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(closest-side at 50% 0%, #000, transparent 75%);
          mask-image: radial-gradient(closest-side at 50% 0%, #000, transparent 75%);
}
.hero h1 { position: relative; }

/* 竖排题词（国风点缀） */
.vertical-motto {
  position: absolute; top: 30px; right: 10px;
  writing-mode: vertical-rl; text-orientation: upright;
  font-family: var(--serif); font-size: 15px; letter-spacing: 7px;
  color: rgba(201,168,106,.55); line-height: 1.7;
  border-right: 1px solid rgba(201,168,106,.28); padding-right: 10px;
  user-select: none; pointer-events: none;
}
@media (max-width: 700px) { .vertical-motto { display: none; } }

/* ---------- 文章上下篇导航 ---------- */
.pager { display: flex; justify-content: space-between; gap: 14px; margin: 40px 0 10px; flex-wrap: wrap; }
.pager-link {
  flex: 1 1 200px; padding: 14px 18px; border: 1px solid var(--border); border-radius: 12px;
  background: rgba(201,168,106,.04); color: var(--text-dim); font-size: 14px; font-weight: 600;
  transition: all .2s ease;
}
.pager-link:hover { color: var(--text); border-color: rgba(201,168,106,.42); transform: translateY(-2px); }
.pager-link.next { text-align: right; }

/* ---------- 学习路径 CTA ---------- */
.path-cta-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 22px; flex-wrap: wrap;
  background: linear-gradient(120deg, rgba(201,168,106,.08), rgba(166,58,46,.05));
  border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 30px;
}
.path-cta-inner h2 { font-family: var(--serif); font-size: 26px; margin-bottom: 6px; letter-spacing: 1px; }
.path-cta-inner p { color: var(--text-dim); max-width: 520px; }

/* ---------- 学习路径（进阶关卡） ---------- */
.page { padding: 30px 0 60px; }
.path-stage { margin-bottom: 42px; }
.path-stage-head { display: flex; align-items: center; gap: 16px; margin-bottom: 16px; }
.path-no {
  flex: 0 0 auto; width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 23px; font-weight: 800; color: var(--ink);
  background: linear-gradient(120deg, var(--gold), var(--gold-soft));
  box-shadow: 0 6px 18px rgba(201,168,106,.25);
}
.path-stage-title h3 { font-family: var(--serif); font-size: 23px; letter-spacing: 1px; }
.path-sub { color: var(--text-dim); font-size: 14px; }
.path-card .path-step { display: inline-block; font-size: 12px; color: var(--gold); letter-spacing: 1px; margin-bottom: 6px; }

/* ---------- 关于 / 散文页 ---------- */
.section-head.with-seal { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.seal {
  flex: 0 0 auto; width: 58px; height: 58px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 30px; color: #fff; letter-spacing: 0;
  background: linear-gradient(140deg, var(--cinnabar), #8e2b20);
  box-shadow: 0 6px 22px rgba(166,58,46,.35);
  transform: rotate(-4deg);
}
.prose { max-width: 760px; }
.prose h3 { font-family: var(--serif); font-size: 22px; margin: 32px 0 12px; color: var(--gold-soft); letter-spacing: 1px; }
.prose p { color: #ddd5c5; margin: 14px 0; }
.prose ul { padding-left: 22px; color: #ddd5c5; margin: 14px 0; }
.prose li { margin: 8px 0; }
.prose blockquote {
  border-left: 3px solid var(--gold); padding: 6px 18px; margin: 22px 0;
  background: rgba(201,168,106,.07); border-radius: 0 10px 10px 0; color: var(--gold-soft); font-style: italic;
}
.prose i { color: var(--text-dim); font-style: normal; }
.disclaimer { max-width: 760px; margin-top: 28px; padding: 14px 18px; border: 1px dashed rgba(201,168,106,.25); border-radius: 12px; }
.disclaimer p { color: #8a7f6e; font-size: 13px; }

/* ---------- 订阅（Newsletter 预留） ---------- */
.subscribe-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap;
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 28px;
}
.subscribe-text h2 { font-family: var(--serif); font-size: 24px; margin-bottom: 6px; letter-spacing: 1px; }
.subscribe-text p { color: var(--text-dim); }
.subscribe-form { display: flex; gap: 10px; flex: 1 1 320px; max-width: 440px; }
.subscribe-form input {
  flex: 1; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border);
  background: rgba(201,168,106,.05); color: var(--text); font-size: 15px; outline: none;
}
.subscribe-form input:focus { border-color: rgba(201,168,106,.55); }
.subscribe-tip { margin-top: 12px; color: #7d7263; font-size: 13px; }
.subscribe-tip.err { color: var(--cinnabar-bright); }

/* ---------- 404 ---------- */
.notfound { text-align: center; padding: 90px 0; }
.notfound .btn { margin-top: 22px; }

/* ---------- 移动端 ---------- */
@media (max-width: 600px) {
  .site-header { flex-direction: column; align-items: flex-start; gap: 10px; padding: 12px 16px; }
  .nav { width: 100%; gap: 4px; }
  .nav a { padding: 7px 10px; font-size: 13px; }
  .hero { padding: 52px 0 32px; }
  .section { padding: 36px 0; }
  .section-head h2 { font-size: 26px; }
}