/* ChatGPT 购买指南 — main.css */
:root {
  --accent: #ff6b35;
  --accent-dark: #e0541f;
  --accent-soft: #fff4ee;
  --text: #1a1a1a;
  --text-mute: #555;
  --text-light: #888;
  --line: #e8e8e8;
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --maxw: 800px;
  --maxw-wide: 1100px;
  --radius: 8px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  word-wrap: break-word;
}

img { max-width: 100%; height: auto; }
a { color: var(--accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: var(--maxw-wide);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.site-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}
.site-title:hover { text-decoration: none; color: var(--accent); }
.site-nav { display: flex; align-items: center; gap: 16px; font-size: 14px; }
.site-nav a { color: var(--text-mute); }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.site-nav .cta {
  background: var(--accent);
  color: #fff;
  padding: 6px 14px;
  border-radius: var(--radius);
  font-weight: 600;
}
.site-nav .cta:hover { background: var(--accent-dark); color: #fff; }

/* Main */
.site-main {
  padding: 32px 0 64px;
  min-height: 60vh;
}

/* Hero (home) */
.hero {
  text-align: center;
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 32px;
}
.hero h1 {
  font-size: 36px;
  margin: 0 0 12px;
  letter-spacing: -0.5px;
}
.hero-sub {
  color: var(--text-mute);
  font-size: 17px;
  max-width: 640px;
  margin: 0 auto 12px;
}
.hero-meta {
  color: var(--text-light);
  font-size: 14px;
  margin: 0;
}

.home-content { max-width: var(--maxw); margin: 0 auto 40px; }

/* Post list */
.post-list-section { max-width: var(--maxw-wide); margin: 0 auto; }
.post-list-section h2,
.home-products h2 {
  font-size: 22px;
  margin: 40px 0 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}
.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
}
.post-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .15s, transform .15s;
}
.post-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.post-card a {
  display: block;
  padding: 18px 20px;
  color: var(--text);
}
.post-card a:hover { text-decoration: none; }
.post-card h3 {
  font-size: 16px;
  margin: 0 0 8px;
  line-height: 1.45;
  color: var(--text);
}
.post-card-desc {
  color: var(--text-mute);
  font-size: 14px;
  margin: 0 0 10px;
  line-height: 1.6;
}
.post-card-meta {
  color: var(--text-light);
  font-size: 12px;
}

/* Post page */
.post {
  max-width: var(--maxw);
  margin: 0 auto;
}
.post-header {
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.post-title {
  font-size: 30px;
  line-height: 1.35;
  margin: 0 0 12px;
  letter-spacing: -0.3px;
}
.post-meta {
  color: var(--text-light);
  font-size: 13px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.post-lede {
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  margin: 0;
  color: var(--text-mute);
  font-size: 15px;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.post-content h2 {
  font-size: 22px;
  margin: 40px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}
.post-content h3 {
  font-size: 18px;
  margin: 28px 0 12px;
}
.post-content h4 {
  font-size: 16px;
  margin: 20px 0 10px;
}
.post-content p { margin: 0 0 16px; }
.post-content ul,
.post-content ol { padding-left: 24px; margin: 0 0 16px; }
.post-content li { margin-bottom: 6px; }
.post-content blockquote {
  border-left: 3px solid var(--accent);
  margin: 16px 0;
  padding: 8px 16px;
  background: var(--accent-soft);
  color: var(--text-mute);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.post-content code {
  background: #f4f4f4;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: "SF Mono", Menlo, Consolas, monospace;
}
.post-content pre {
  background: #1a1a1a;
  color: #f0f0f0;
  padding: 16px 20px;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
}
.post-content pre code { background: none; padding: 0; color: inherit; }

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}
.post-content table th,
.post-content table td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
.post-content table th {
  background: var(--bg-soft);
  font-weight: 600;
}
.post-content table tr:nth-child(even) td { background: #fafafa; }

.post-content hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 32px 0;
}

/* Post CTA */
.post-cta {
  margin-top: 48px;
  padding: 28px;
  background: var(--accent-soft);
  border-radius: var(--radius);
  border: 1px solid #ffd9c4;
}
.post-cta h3 {
  margin: 0 0 8px;
  font-size: 18px;
  color: var(--accent-dark);
}
.post-cta p { margin: 0 0 16px; font-size: 14px; color: var(--text); }

/* Product grid */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--text);
  transition: border-color .15s, box-shadow .15s;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.product-card:hover {
  border-color: var(--accent);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(255, 107, 53, 0.1);
}
.product-name { font-weight: 600; font-size: 15px; line-height: 1.4; }
.product-desc { font-size: 13px; color: var(--text-mute); }
.product-price { color: var(--accent-dark); font-weight: 700; font-size: 15px; margin-top: auto; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 40px 0 20px;
  margin-top: 40px;
  font-size: 14px;
  color: var(--text-mute);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  margin-bottom: 24px;
}
.footer-grid h4 {
  font-size: 14px;
  margin: 0 0 12px;
  color: var(--text);
}
.footer-grid p { margin: 0 0 8px; line-height: 1.6; }
.footer-products { list-style: none; padding: 0; margin: 0; }
.footer-products li { margin-bottom: 6px; }
.footer-bottom {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--text-light);
}

/* About / static pages */
.page-content { max-width: var(--maxw); margin: 0 auto; }
.page-content h1 { font-size: 28px; margin: 0 0 16px; }

/* 404 */
.error-404 { text-align: center; padding: 80px 20px; }
.error-404 h1 { font-size: 64px; margin: 0; color: var(--accent); }
.error-404 p { color: var(--text-mute); }

/* Responsive */
@media (max-width: 640px) {
  .site-header .wrap { height: auto; padding: 12px 16px; flex-wrap: wrap; gap: 8px; }
  .site-nav { gap: 10px; font-size: 13px; }
  .site-nav .cta { padding: 5px 10px; font-size: 12px; }
  .hero h1 { font-size: 26px; }
  .hero-sub { font-size: 15px; }
  .post-title { font-size: 24px; }
  .post-content h2 { font-size: 19px; }
  .post-content h3 { font-size: 17px; }
  .post-content table { font-size: 13px; }
  .post-content table th, .post-content table td { padding: 8px 10px; }
  .post-cta { padding: 20px; }
  .footer-grid { gap: 24px; }
}