/* ==========================================================================
   gpt211.com 博客样式 — 复用主站 Light Aurora 设计语言
   自包含，放在 /blog/ 目录，与主站 styles.css 独立
   ========================================================================== */
:root {
  --bg-base: #F8FAFC;
  --bg-card: #FFFFFF;
  --ink-1: #0F172A;
  --ink-2: #334155;
  --ink-3: #64748B;
  --ink-4: #94A3B8;
  --blue-50: #EFF6FF;
  --blue-500: #3B82F6;
  --blue-600: #2563EB;
  --blue-700: #1D4ED8;
  --line-1: rgba(15, 23, 42, 0.06);
  --line-2: rgba(15, 23, 42, 0.10);
  --radius-lg: 18px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 8px 24px -8px rgba(15, 23, 42, 0.10), 0 2px 6px rgba(15, 23, 42, 0.04);
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-2);
  background:
    radial-gradient(60% 50% at 12% 8%, rgba(201, 184, 255, 0.22), transparent 70%),
    radial-gradient(50% 45% at 92% 6%, rgba(168, 200, 255, 0.20), transparent 70%),
    var(--bg-base);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--blue-600); text-decoration: none; }
a:hover { text-decoration: underline; }

.shell { width: 100%; max-width: 760px; margin: 0 auto; padding: 0 20px; }

/* 顶栏 */
.blog-topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(248, 250, 252, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line-1);
}
.blog-topbar-inner {
  max-width: 1000px; margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.blog-brand { display: inline-flex; align-items: center; gap: 10px; }
.blog-brand-mark { width: 28px; height: 28px; }
.blog-brand-name { font-weight: 800; font-size: 1.1rem; color: var(--ink-1); letter-spacing: -0.01em; }
.blog-brand-name em {
  font-style: normal; font-weight: 900;
  background: linear-gradient(90deg, #3B82F6, #8B5CF6);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.blog-nav-cta {
  padding: 8px 18px; border-radius: 999px;
  background: linear-gradient(180deg, #3D8AF7, var(--blue-600));
  background-clip: padding-box; -webkit-background-clip: padding-box;
  color: #fff !important; font-size: 0.88rem; font-weight: 700;
  text-decoration: none !important;
  box-shadow: 0 4px 12px -2px rgba(59, 130, 246, 0.4);
}

/* 面包屑 */
.breadcrumb { font-size: 0.84rem; color: var(--ink-4); margin: 28px 0 0; }
.breadcrumb a { color: var(--ink-3); }
.breadcrumb span { margin: 0 6px; }

/* 文章 */
.article { padding: 24px 0 60px; }
.article-header { margin: 16px 0 32px; }
.article-tag {
  display: inline-block; padding: 4px 12px; margin-bottom: 14px;
  background: var(--blue-50); color: var(--blue-700);
  border-radius: 999px; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.04em;
}
.article h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800; line-height: 1.3; letter-spacing: -0.02em;
  color: var(--ink-1); margin: 0 0 14px;
}
.article-meta { font-size: 0.86rem; color: var(--ink-4); }
.article-meta span { margin-right: 14px; }

.article-body { font-size: 1.02rem; }
.article-body h2 {
  font-size: 1.4rem; font-weight: 800; color: var(--ink-1);
  margin: 40px 0 14px; padding-top: 8px; letter-spacing: -0.01em;
  scroll-margin-top: 80px;
}
.article-body h3 {
  font-size: 1.12rem; font-weight: 700; color: var(--ink-1);
  margin: 28px 0 10px;
}
.article-body p { margin: 0 0 18px; }
.article-body ul, .article-body ol { margin: 0 0 18px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--ink-1); font-weight: 700; }
.article-body a { font-weight: 600; }

/* 提示框 */
.callout {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 18px 20px; margin: 24px 0;
  background: linear-gradient(135deg, rgba(59,130,246,0.06), rgba(139,92,246,0.06));
  border: 1px solid rgba(99,102,241,0.15); border-radius: 14px;
  font-size: 0.95rem;
}
.callout-icon { flex-shrink: 0; font-size: 1.3rem; line-height: 1.5; }

/* 表格 */
.article-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  font-size: 0.92rem; background: var(--bg-card);
  border-radius: 14px; overflow: hidden; box-shadow: var(--shadow-sm);
}
.article-body th, .article-body td {
  padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--line-1);
}
.article-body th { background: var(--blue-50); font-weight: 700; color: var(--ink-1); }
.article-body tr:last-child td { border-bottom: 0; }

/* 文末 CTA */
.article-cta {
  margin: 40px 0 0; padding: 32px;
  background: linear-gradient(135deg, rgba(201,184,255,0.18), rgba(168,200,255,0.18));
  border: 1px solid rgba(99,102,241,0.15); border-radius: var(--radius-lg);
  text-align: center;
}
.article-cta h3 { font-size: 1.25rem; font-weight: 800; color: var(--ink-1); margin: 0 0 8px; }
.article-cta p { font-size: 0.95rem; color: var(--ink-2); margin: 0 0 20px; }
.article-cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 28px; border-radius: 999px;
  background: linear-gradient(180deg, #3D8AF7, var(--blue-600));
  background-clip: padding-box; -webkit-background-clip: padding-box;
  color: #fff !important; font-weight: 700; font-size: 1rem;
  text-decoration: none !important;
  box-shadow: 0 6px 16px -2px rgba(59, 130, 246, 0.4);
  transition: transform 160ms ease;
}
.article-cta-btn:hover { transform: translateY(-2px); }

/* 相关文章 */
.related { margin: 48px 0 0; }
.related h2 { font-size: 1.2rem; font-weight: 800; color: var(--ink-1); margin: 0 0 16px; }
.related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.related-card {
  display: block; padding: 18px 20px;
  background: var(--bg-card); border: 1px solid var(--line-1);
  border-radius: 14px; box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.related-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration: none; }
.related-card-title { font-size: 0.98rem; font-weight: 700; color: var(--ink-1); margin-bottom: 4px; }
.related-card-desc { font-size: 0.84rem; color: var(--ink-3); }

/* 博客列表页 */
.bloglist { padding: 32px 0 60px; }
.bloglist-head { text-align: center; margin: 24px 0 36px; }
.bloglist-head h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 800; color: var(--ink-1); margin: 0 0 10px; letter-spacing: -0.02em; }
.bloglist-head p { color: var(--ink-3); font-size: 1rem; }
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
  display: block; padding: 24px;
  background: var(--bg-card); border: 1px solid var(--line-1);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); text-decoration: none; }
.post-card-tag {
  display: inline-block; padding: 3px 10px; margin-bottom: 12px;
  background: var(--blue-50); color: var(--blue-700);
  border-radius: 999px; font-size: 0.74rem; font-weight: 700;
}
.post-card h2 { font-size: 1.25rem; font-weight: 800; color: var(--ink-1); margin: 0 0 8px; letter-spacing: -0.01em; }
.post-card p { font-size: 0.92rem; color: var(--ink-3); margin: 0 0 12px; }
.post-card-meta { font-size: 0.82rem; color: var(--ink-4); }

/* 页脚 */
.blog-footer {
  border-top: 1px solid var(--line-1); background: rgba(241, 245, 249, 0.6);
  padding: 28px 0; text-align: center; font-size: 0.84rem; color: var(--ink-4);
}
.blog-footer a { color: var(--ink-3); }
.blog-footer .disclaimer { max-width: 760px; margin: 12px auto 0; font-size: 0.76rem; line-height: 1.7; }

@media (max-width: 600px) {
  .related-grid { grid-template-columns: 1fr; }
  .article-cta { padding: 24px 20px; }
}