/* ===== 轻栈 LightStack · 技术分享 ===== */
:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --surface-alt: #eef2f8;
  --text: #1f2937;
  --text-soft: #4b5563;
  --muted: #6b7280;
  --line: #e5e9f0;
  --accent: #2563eb;
  --accent-deep: #1d4ed8;
  --accent-soft: #dbeafe;
  --ok: #059669;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 6px 20px rgba(16, 24, 40, .05);
  --shadow-lg: 0 10px 34px rgba(16, 24, 40, .10);
  --font: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Noto Sans CJK SC", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-deep); }
img { max-width: 100%; display: block; }

.container { width: min(1120px, 92%); margin: 0 auto; }
.container--narrow { width: min(760px, 92%); }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 62px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.06rem; color: var(--text); }
.brand:hover { color: var(--text); }
.brand-logo {
  width: 30px; height: 30px; border-radius: 9px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  display: grid; place-items: center; color: #fff; font-size: .8rem;
}
.brand small { font-weight: 400; color: var(--muted); font-size: .8rem; margin-left: 2px; }

.nav-links { display: flex; gap: 4px; align-items: center; }
.nav-links a {
  color: var(--text-soft); padding: 8px 14px; border-radius: 8px; font-size: .95rem;
}
.nav-links a:hover { color: var(--text); background: var(--surface-alt); }
.nav-links a.active { color: var(--accent-deep); background: var(--accent-soft); font-weight: 600; }
.nav-toggle {
  display: none; border: 0; background: none; cursor: pointer; padding: 6px; border-radius: 8px;
}
.nav-toggle:hover { background: var(--surface-alt); }
.nav-toggle svg { display: block; }

/* ===== 主区域 ===== */
main { min-height: calc(100vh - 300px); }
.hero {
  background:
    radial-gradient(1100px 320px at 15% -10%, rgba(37, 99, 235, .10), transparent 60%),
    radial-gradient(900px 300px at 95% 0%, rgba(124, 58, 237, .08), transparent 55%),
    var(--surface);
  border-bottom: 1px solid var(--line);
}
.hero-inner { padding: 64px 0 56px; max-width: 780px; }
.hero-eyebrow {
  display: inline-flex; align-items: center; gap: 6px; font-size: .82rem; color: var(--accent-deep);
  background: var(--accent-soft); border: 1px solid #bfdbfe; padding: 4px 12px; border-radius: 999px;
  font-weight: 600; margin-bottom: 18px;
}
.hero h1 { margin: 0 0 14px; font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.3; }
.hero p.lead { margin: 0 0 22px; color: var(--text-soft); font-size: 1.08rem; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; border-radius: 999px;
  font-weight: 600; font-size: .96rem; border: 1px solid transparent; cursor: pointer;
  transition: transform .12s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); color: #fff; box-shadow: 0 6px 18px rgba(37, 99, 235, .35); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--line); }
.btn-ghost:hover { border-color: #c9d4e6; background: var(--surface); color: var(--text); }

.stats {
  display: flex; gap: 34px; flex-wrap: wrap; margin-top: 36px; padding-top: 26px;
  border-top: 1px dashed var(--line);
}
.stats b { display: block; font-size: 1.5rem; color: var(--text); }
.stats span { color: var(--muted); font-size: .86rem; }

.section { padding: 54px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.section-head h2 { margin: 0; font-size: 1.45rem; }
.section-head p { margin: 4px 0 0; color: var(--muted); font-size: .94rem; }

.grid-posts { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column;
  transition: box-shadow .15s ease, transform .15s ease;
}
.card:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.card .tag { font-size: .78rem; }
.card h3 { margin: 10px 0 8px; font-size: 1.08rem; line-height: 1.45; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--accent-deep); }
.card p { margin: 0 0 16px; color: var(--text-soft); font-size: .93rem; flex: 1; }
.card .meta { color: var(--muted); font-size: .82rem; display: flex; gap: 14px; }
.card .more { font-size: .88rem; font-weight: 600; }

.tag {
  display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: .78rem;
  background: var(--surface-alt); color: var(--accent-deep); border: 1px solid var(--line);
}

.topic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.topic {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow);
}
.topic .ico {
  width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent-deep); font-size: 1.2rem; margin-bottom: 12px;
}
.topic h3 { margin: 0 0 6px; font-size: 1.02rem; }
.topic p { margin: 0; color: var(--muted); font-size: .9rem; }

.notice {
  background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--ok);
  border-radius: 12px; padding: 18px 20px; color: var(--text-soft); font-size: .94rem;
  box-shadow: var(--shadow);
}
.notice b { color: var(--text); }

/* ===== 文章正文 ===== */
.article { padding: 46px 0 60px; }
.article-header { margin-bottom: 30px; }
.article-header .crumbs { color: var(--muted); font-size: .86rem; margin-bottom: 10px; }
.article-header .crumbs a { color: var(--muted); }
.article-header .crumbs a:hover { color: var(--accent); }
.article h1.title { margin: 0 0 12px; font-size: clamp(1.5rem, 3.4vw, 2.1rem); line-height: 1.35; }
.article-header .meta { color: var(--muted); font-size: .88rem; display: flex; gap: 18px; flex-wrap: wrap; align-items: center; }

.prose { font-size: 1.01rem; color: #334155; }
.prose h2 { font-size: 1.35rem; margin: 2em 0 .7em; padding-bottom: .3em; border-bottom: 1px solid var(--line); }
.prose h3 { font-size: 1.15rem; margin: 1.8em 0 .6em; }
.prose p { margin: 0 0 1.15em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 0 0 1.2em; }
.prose li { margin: .3em 0; }
.prose blockquote {
  margin: 1.4em 0; padding: 12px 18px; border-left: 4px solid var(--accent);
  background: var(--surface-alt); border-radius: 0 10px 10px 0; color: var(--text-soft);
}
.prose code {
  font-family: var(--mono); font-size: .88em; background: var(--surface-alt);
  padding: .15em .45em; border-radius: 6px; color: #be185d;
}
.prose pre {
  background: #0f172a; color: #e2e8f0; padding: 18px 20px; border-radius: 12px;
  overflow-x: auto; line-height: 1.6; font-size: .88rem; margin: 1.3em 0;
}
.prose pre code { background: none; color: inherit; padding: 0; font-size: 1em; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.3em 0; font-size: .94rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.prose th { background: var(--surface-alt); }
.prose a { text-decoration: underline; text-underline-offset: 3px; }

/* ===== 页脚 / 备案信息 ===== */
.site-footer { border-top: 1px solid var(--line); background: var(--surface); margin-top: 60px; }
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; padding: 42px 0 30px;
}
.footer-grid h4 { margin: 0 0 12px; font-size: 1rem; }
.footer-grid p { margin: 0 0 10px; color: var(--muted); font-size: .9rem; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin: 8px 0; }
.footer-grid li a { color: var(--muted); font-size: .92rem; }
.footer-grid li a:hover { color: var(--accent); }
.footer-legal {
  border-top: 1px solid var(--line); padding: 16px 0; color: var(--muted); font-size: .86rem;
  display: flex; flex-wrap: wrap; gap: 8px 26px; align-items: center; justify-content: space-between;
}
.footer-legal .icp a { color: var(--muted); }
.footer-legal .icp a:hover { color: var(--accent); }
.footer-legal .warn { color: #b45309; }

/* ===== 关于页 ===== */
.profile { display: flex; gap: 26px; align-items: flex-start; flex-wrap: wrap; }
.avatar {
  width: 96px; height: 96px; border-radius: 22px; flex: 0 0 auto;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  display: grid; place-items: center; color: #fff; font-size: 2.2rem; font-weight: 700;
}
.info-block {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); margin-top: 18px;
}
.info-block h3 { margin: 0 0 12px; font-size: 1.05rem; }
.info-block table { width: 100%; border-collapse: collapse; font-size: .95rem; }
.info-block th, .info-block td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.info-block th { width: 150px; color: var(--muted); font-weight: 400; white-space: nowrap; }
.placeholder { color: #b45309; background: #fef3c7; border-radius: 6px; padding: 1px 8px; font-size: .9em; }

.error-page { text-align: center; padding: 90px 0; }
.error-page .code {
  font-size: 4rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* ===== 移动端 ===== */
@media (max-width: 760px) {
  .nav-links {
    display: none; position: absolute; top: 62px; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 10px 4%;
    box-shadow: var(--shadow-lg);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-toggle { display: block; }
  .hero-inner { padding: 44px 0 38px; }
  .section { padding: 40px 0; }
  .stats { gap: 22px; }
  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .footer-legal { justify-content: flex-start; }
  .profile { flex-direction: column; }
  .info-block th { width: 104px; }
  .article { padding: 28px 0 44px; }
  .prose pre { font-size: .8rem; padding: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}