:root {
  --walnut: #3E2723;
  --walnut-light: #5D4037;
  --walnut-mid: #8D6E63;
  --cream: #F5F0EB;
  --cream-dark: #E8DDD3;
  --white: #FFFFFF;
  --text: #2C2416;
  --text-light: #6B5E52;
  --gold: #B8976A;
  --max-width: 860px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.9;
  font-size: 16px;
}

/* Nav */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--cream-dark);
  padding: 0 24px;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.nav-brand {
  font-size: 20px; font-weight: 700;
  color: var(--walnut); letter-spacing: 2px;
  text-decoration: none;
}
.nav-back {
  text-decoration: none; color: var(--text-light);
  font-size: 14px; transition: color 0.2s;
}
.nav-back:hover { color: var(--walnut); }

/* Article */
article {
  margin-top: 64px;
  padding: 80px 24px 100px;
}
.article-inner {
  max-width: var(--max-width); margin: 0 auto;
}

.breadcrumb {
  font-size: 13px; color: var(--text-light); margin-bottom: 32px;
}
.breadcrumb a {
  color: var(--text-light); text-decoration: none;
}
.breadcrumb a:hover { color: var(--walnut); }

.article-tag {
  font-size: 12px; letter-spacing: 4px; color: var(--gold);
  text-transform: uppercase; margin-bottom: 12px;
}
.article-title {
  font-size: clamp(24px, 4vw, 36px); font-weight: 300;
  color: var(--walnut); margin-bottom: 16px; letter-spacing: 2px;
  line-height: 1.4;
}
.article-sub {
  font-size: 16px; color: var(--text-light); margin-bottom: 40px;
  padding-bottom: 32px; border-bottom: 1px solid var(--cream-dark);
}

/* Content */
.content h2 {
  font-size: 22px; font-weight: 500; color: var(--walnut);
  margin: 48px 0 16px; padding-top: 8px;
}
.content h3 {
  font-size: 18px; font-weight: 500; color: var(--walnut-light);
  margin: 32px 0 12px;
}
.content p {
  margin-bottom: 18px; color: var(--text-light);
}
.content strong { color: var(--walnut); font-weight: 600; }
.content ul {
  margin: 16px 0 24px; padding-left: 24px;
}
.content li {
  margin-bottom: 10px; color: var(--text-light);
  list-style: none; position: relative; padding-left: 16px;
}
.content li::before {
  content: '—'; color: var(--gold); position: absolute; left: 0;
}
.content .highlight-box {
  background: var(--cream); padding: 24px 28px;
  border-left: 3px solid var(--gold); margin: 32px 0;
  border-radius: 2px;
}
.content .highlight-box p {
  margin-bottom: 0; color: var(--walnut); font-size: 15px;
}

/* CTA Block */
.cta-block {
  margin-top: 56px; padding: 40px;
  background: var(--walnut); color: var(--cream);
  text-align: center; border-radius: 2px;
}
.cta-block h3 {
  font-size: 20px; font-weight: 500; color: var(--cream); margin-bottom: 12px;
}
.cta-block p {
  color: rgba(255,255,255,0.65); font-size: 15px; margin-bottom: 24px;
}
.cta-block .btn {
  display: inline-block; padding: 12px 40px;
  border: 1px solid var(--gold); color: var(--gold);
  text-decoration: none; font-size: 15px; letter-spacing: 2px;
  transition: all 0.3s;
}
.cta-block .btn:hover { background: rgba(184,151,106,0.12); }
.cta-info {
  margin-top: 20px; font-size: 13px; color: rgba(255,255,255,0.4);
}

/* Footer */
footer {
  background: #1A1210; color: rgba(255,255,255,0.4);
  padding: 48px 24px; text-align: center; font-size: 13px;
}
footer .brand { color: var(--cream); font-size: 18px; font-weight: 700; letter-spacing: 2px; margin-bottom: 12px; }
footer a { color: rgba(255,255,255,0.5); text-decoration: none; }

@media (max-width: 768px) {
  article { padding: 48px 20px 64px; }
}