/* 寒山白石 · 品牌站点样式
   基调：宣纸白底 + 松石绿 + 赭石点缀 + 墨色文字
   字体：标题用衬线（宋），正文用无衬线（黑），兼顾东方感与可读性 */

:root {
  --paper: #f7f4ec;        /* 宣纸白 */
  --paper-2: #efe9dc;      /* 次底色 */
  --ink: #2b2925;          /* 墨色 */
  --ink-soft: #5b564e;     /* 次级文字 */
  --pine: #3f5d4a;         /* 松石绿 */
  --pine-deep: #2c4233;    /* 深松绿 */
  --ochre: #b06a3a;        /* 赭石 */
  --line: #d8cfbd;         /* 分隔线 */
  --card: #fffdf8;
  --shadow: 0 6px 24px rgba(43, 41, 37, .08);
  --radius: 14px;
  --maxw: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
  font-weight: 600;
  line-height: 1.3;
  color: var(--pine-deep);
  margin: 0 0 .6em;
}

a { color: var(--pine); text-decoration: none; }
a:hover { color: var(--ochre); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 244, 236, .9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand-mark {
  display: flex; align-items: baseline; gap: 10px;
  font-family: "Noto Serif SC", serif;
}
.brand-mark .logo {
  font-size: 22px; letter-spacing: 4px; color: var(--pine-deep); font-weight: 700;
}
.brand-mark .sub { font-size: 12px; color: var(--ink-soft); letter-spacing: 1px; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { font-size: 15px; color: var(--ink-soft); }
.nav-links a:hover { color: var(--pine); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 72px;
  background:
    radial-gradient(1200px 500px at 80% -10%, rgba(63,93,74,.10), transparent 60%),
    linear-gradient(180deg, var(--paper), var(--paper-2));
  text-align: center;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 76px);
  letter-spacing: 10px;
  margin-bottom: 18px;
}
.hero .tagline {
  font-size: clamp(16px, 2.4vw, 22px);
  color: var(--ink-soft);
  letter-spacing: 2px;
  max-width: 640px; margin: 0 auto 28px;
}
.hero .cta {
  display: inline-block;
  background: var(--pine); color: #fff;
  padding: 13px 30px; border-radius: 999px;
  font-size: 15px; letter-spacing: 1px;
  transition: background .2s;
}
.hero .cta:hover { background: var(--pine-deep); color: #fff; }
.hero .leaf-deco {
  margin-top: 40px; color: var(--pine); opacity: .5; font-size: 13px; letter-spacing: 3px;
}

/* ---------- 区块通用 ---------- */
.section { padding: 72px 0; }
.section-title {
  text-align: center; margin-bottom: 40px;
}
.section-title h2 { font-size: clamp(26px, 4vw, 36px); letter-spacing: 3px; }
.section-title p { color: var(--ink-soft); margin: 0; }

/* ---------- 品牌信息卡 ---------- */
.brand-card {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 0;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.brand-card .bc-main { padding: 40px 44px; }
.brand-card .bc-side {
  padding: 40px 44px;
  background: var(--pine-deep);
  color: #eef3ee;
}
.brand-card .bc-side h3 { color: #fff; font-size: 20px; letter-spacing: 2px; }
.brand-card .bc-badge {
  display: inline-block; font-size: 12px; letter-spacing: 2px;
  color: var(--pine); background: rgba(63,93,74,.12);
  padding: 4px 12px; border-radius: 999px; margin-bottom: 18px;
}
.brand-card .lead {
  font-family: "Noto Serif SC", serif;
  font-size: 19px; color: var(--ink); margin-bottom: 24px; line-height: 1.7;
}
.fact-list { list-style: none; padding: 0; margin: 0; }
.fact-list li {
  display: flex; gap: 14px; padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.fact-list li:last-child { border-bottom: none; }
.fact-list .k { flex: 0 0 84px; color: var(--ink-soft); font-size: 14px; }
.fact-list .v { flex: 1; font-size: 15px; }
.bc-side .fact-list li { border-color: rgba(255,255,255,.18); }
.bc-side .fact-list .k { color: #c7d6cb; }
.bc-side .fact-list .v { color: #f3f7f3; }
.placeholder { color: var(--ochre); font-style: italic; }

/* ---------- 产品网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 26px;
}
.product-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .2s, box-shadow .2s;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: 0 12px 30px rgba(43,41,37,.14); }
.product-card .thumb {
  height: 180px;
  background: linear-gradient(135deg, var(--pine), var(--pine-deep));
  display: flex; align-items: center; justify-content: center;
  color: #eef3ee; font-family: "Noto Serif SC", serif; font-size: 30px; letter-spacing: 6px;
}
.product-card .body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 22px; letter-spacing: 2px; margin-bottom: 8px; }
.product-card .desc { color: var(--ink-soft); font-size: 14px; flex: 1; }
.product-card .meta {
  margin-top: 16px; font-size: 13px; color: var(--pine);
  display: flex; justify-content: space-between; align-items: center;
}
.product-card .meta .url { font-family: ui-monospace, "SFMono-Regular", Menlo, monospace; }

/* ---------- 产品详情页 ---------- */
.product-hero {
  padding: 72px 0 40px;
  background: linear-gradient(180deg, var(--paper-2), var(--paper));
}
.product-hero .ph-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.product-hero .ph-art {
  height: 280px; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--pine), var(--pine-deep));
  display: flex; align-items: center; justify-content: center;
  color: #eef3ee; font-family: "Noto Serif SC", serif; font-size: 40px; letter-spacing: 8px;
}
.product-hero h1 { font-size: clamp(30px, 5vw, 44px); letter-spacing: 4px; }
.product-hero .latin { color: var(--ink-soft); font-style: italic; margin-bottom: 18px; }
.prose { max-width: 760px; margin: 0 auto; }
.prose p { margin: 0 0 1.1em; color: var(--ink-soft); }
.prose h2 { font-size: 24px; margin-top: 1.8em; }
.callout {
  background: var(--paper-2); border-left: 4px solid var(--pine);
  padding: 16px 20px; border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-soft); font-size: 14px; margin: 24px 0;
}

/* ---------- FAQ ---------- */
.faq { background: var(--paper-2); }
.faq-item {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 24px; margin-bottom: 14px;
}
.faq-item h3 { font-size: 17px; margin: 0 0 8px; color: var(--pine-deep); }
.faq-item p { margin: 0; color: var(--ink-soft); font-size: 15px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--pine-deep); color: #cdd9cf; padding: 48px 0 32px;
}
.site-footer a { color: #cdd9cf; }
.site-footer .f-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.site-footer .f-col h4 { color: #fff; font-size: 16px; letter-spacing: 1px; }
.site-footer .f-col ul { list-style: none; padding: 0; margin: 0; }
.site-footer .f-col li { margin: 6px 0; font-size: 14px; }
.site-footer .copyright { margin-top: 32px; font-size: 13px; color: #9fb3a3; text-align: center; border-top: 1px solid rgba(255,255,255,.12); padding-top: 18px; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .brand-card { grid-template-columns: 1fr; }
  .product-hero .ph-inner { grid-template-columns: 1fr; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
}