/* 锐雀体能官网 · 全局样式 */
:root {
  --c-primary: #c0392b;      /* 主色 · 红 */
  --c-primary-dark: #96281b;
  --c-ink: #1a1a1a;          /* 主文字 */
  --c-ink-soft: #4a4a4a;     /* 次文字 */
  --c-muted: #8a8a8a;
  --c-bg: #faf7f2;           /* 暖白背景 */
  --c-card: #ffffff;
  --c-line: #e8e2d8;         /* 分隔线 */
  --c-gold: #b8860b;         /* 点缀金 */
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-sans: "PingFang SC", "Source Han Sans SC", "Microsoft YaHei", "HarmonyOS Sans SC", "MiSans", -apple-system, "Helvetica Neue", sans-serif;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.85;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* 顶部导航 */
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--c-line);
  position: sticky; top: 0; z-index: 100;
}
.nav {
  max-width: 1080px; margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
}
.brand { font-family: var(--font-sans); font-weight: 800; font-size: 21px; color: var(--c-ink); letter-spacing: 1.5px; }
.brand .accent { color: var(--c-primary); }
.brand-logo { display: flex; align-items: center; gap: 10px; }
.brand-logo img { height: 40px; width: auto; display: block; border-radius: 6px; }
.brand-logo .brand-text { font-family: var(--font-sans); font-weight: 800; font-size: 20px; color: var(--c-ink); letter-spacing: 1.5px; }
.brand-logo .brand-text .accent { color: var(--c-primary); }
.nav-links { display: flex; gap: 26px; align-items: center; }
.nav-links a { color: var(--c-ink-soft); font-size: 15px; font-weight: 500; letter-spacing: 0.5px; }
.nav-links a:hover { color: var(--c-primary); }
.nav-cta {
  background: var(--c-primary); color: #fff !important;
  padding: 8px 18px; border-radius: 24px; font-size: 14px;
}
.nav-cta:hover { background: var(--c-primary-dark); text-decoration: none; }

/* 主容器 */
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #1a1a1a 0%, #3a1a15 100%);
  color: #fff; text-align: center; padding: 96px 24px 80px;
}
.hero .tagline { color: #e8c07a; letter-spacing: 4px; font-size: 14px; margin-bottom: 20px; }
.hero h1 { font-family: var(--font-serif); font-size: 44px; font-weight: 700; line-height: 1.3; margin-bottom: 20px; }
.hero h1 .accent { color: #e8c07a; }
.hero p.lead { font-size: 18px; color: #d8d2c8; max-width: 680px; margin: 0 auto 36px; line-height: 1.9; }
.hero .btn-group { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 14px 32px; border-radius: 30px;
  font-size: 16px; font-weight: 600; transition: all .2s;
}
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); text-decoration: none; }
.btn-ghost { background: transparent; color: #e8c07a; border: 1px solid #e8c07a; }
.btn-ghost:hover { background: rgba(232,192,122,.1); text-decoration: none; }

/* 区块 */
.section { padding: 72px 0; }
.section.alt { background: #fff; border-top: 1px solid var(--c-line); border-bottom: 1px solid var(--c-line); }
.section-head { text-align: center; margin-bottom: 48px; }
.section-head .kicker { color: var(--c-gold); letter-spacing: 3px; font-size: 13px; margin-bottom: 12px; }
.section-head h2 { font-family: var(--font-serif); font-size: 32px; font-weight: 700; }
.section-head p { color: var(--c-ink-soft); max-width: 640px; margin: 16px auto 0; }

/* 三元模型卡片 */
.tri-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.tri-card {
  background: var(--c-card); border: 1px solid var(--c-line);
  border-radius: 12px; padding: 32px 28px; text-align: center;
  transition: transform .2s, box-shadow .2s;
}
.tri-card:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,.08); }
.tri-card .icon { font-size: 40px; margin-bottom: 16px; }
.tri-card h3 { font-family: var(--font-serif); font-size: 22px; margin-bottom: 8px; }
.tri-card .role { display: inline-block; background: #fdf3ef; color: var(--c-primary); font-size: 13px; padding: 3px 12px; border-radius: 12px; margin-bottom: 14px; }
.tri-card p { color: var(--c-ink-soft); font-size: 15px; }

/* 步骤 */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step { background: var(--c-card); border: 1px solid var(--c-line); border-radius: 12px; padding: 28px; }
.step .num { font-family: var(--font-serif); font-size: 36px; color: var(--c-primary); font-weight: 700; }
.step h3 { font-size: 19px; margin: 10px 0 8px; }
.step p { color: var(--c-ink-soft); font-size: 15px; }

/* 卡片列表 */
.card-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card {
  background: var(--c-card); border: 1px solid var(--c-line);
  border-radius: 12px; padding: 28px; display: block; color: var(--c-ink);
}
.card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.06); text-decoration: none; border-color: #d8c9b4; }
.card h3 { font-family: var(--font-serif); font-size: 20px; margin-bottom: 10px; }
.card p { color: var(--c-ink-soft); font-size: 15px; }
.card .meta { color: var(--c-muted); font-size: 13px; margin-top: 12px; }

/* 引用块 */
.quote {
  background: #fdf3ef; border-left: 4px solid var(--c-primary);
  padding: 24px 28px; border-radius: 0 8px 8px 0; margin: 24px 0;
}
.quote p { font-family: var(--font-serif); font-size: 19px; color: var(--c-ink); line-height: 1.8; }

/* 文章正文 */
.article { max-width: 760px; margin: 0 auto; padding: 64px 24px; }
.article .back { color: var(--c-muted); font-size: 14px; }
.article h1 { font-family: var(--font-serif); font-size: 34px; line-height: 1.4; margin: 20px 0 16px; }
.article .meta { color: var(--c-muted); font-size: 14px; margin-bottom: 32px; }
.article .answer-first {
  background: #fdf3ef; border: 1px solid #f3d9c8; border-radius: 10px;
  padding: 20px 24px; margin-bottom: 32px;
}
.article .answer-first strong { color: var(--c-primary); }
.article h2 { font-family: var(--font-serif); font-size: 24px; margin: 40px 0 16px; }
.article h3 { font-size: 19px; margin: 28px 0 12px; }
.article p { margin-bottom: 18px; color: #2a2a2a; }
.article ul, .article ol { margin: 0 0 20px 24px; }
.article li { margin-bottom: 10px; }
.article blockquote {
  border-left: 3px solid var(--c-gold); padding: 8px 20px; color: var(--c-ink-soft);
  background: #faf6ef; border-radius: 0 6px 6px 0; margin: 20px 0;
}

/* FAQ */
.faq-item { background: var(--c-card); border: 1px solid var(--c-line); border-radius: 10px; margin-bottom: 16px; overflow: hidden; }
.faq-item summary { padding: 18px 24px; cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::after { content: "+"; font-size: 22px; color: var(--c-primary); }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-a { padding: 0 24px 20px; color: var(--c-ink-soft); }

/* 页脚 */
.site-footer { background: #1a1a1a; color: #a8a8a8; padding: 48px 24px; text-align: center; }
.site-footer .brand { color: #fff; margin-bottom: 12px; }
.site-footer .footer-logo { display: inline-block; background: #fff; padding: 8px; border-radius: 10px; margin-bottom: 16px; }
.site-footer .footer-logo img { height: 52px; width: auto; display: block; }
.site-footer p { font-size: 14px; margin-bottom: 6px; }
.site-footer .links { margin: 16px 0; display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; }
.site-footer .links a { color: #c8c8c8; font-size: 14px; }

/* 响应式 */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .tri-grid, .steps { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 13px; }
}