/* ===== Base ===== */
:root {
  --primary: #3080FE;
  --primary-dark: #1E60D8;
  --primary-light: #E8F1FF;
  --ink: #1a1a1a;
  --ink-soft: #4a5568;
  --ink-mute: #8a94a6;
  --line: #e8ecf3;
  --bg: #ffffff;
  --bg-soft: #f7f9fc;
  --bg-card: #ffffff;
  --shadow-sm: 0 1px 2px rgba(48, 128, 254, 0.04), 0 2px 6px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(48, 128, 254, 0.08);
  --radius: 12px;
  --radius-lg: 16px;
  --maxw: 1120px;
  --maxw-narrow: 720px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--primary); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 { color: var(--ink); font-weight: 600; line-height: 1.3; margin: 0; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: var(--maxw-narrow); }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--ink);
  font-size: 15px;
}
.brand:hover { color: var(--primary); }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  font-weight: 700;
  font-size: 16px;
}
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
}
.nav-links a:hover { color: var(--primary); }

/* ===== Hero ===== */
.hero {
  padding: 80px 0 64px;
  background: linear-gradient(180deg, var(--primary-light) 0%, var(--bg) 100%);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}
.kicker {
  display: inline-block;
  font-size: 13px;
  color: var(--primary);
  background: rgba(48, 128, 254, 0.08);
  padding: 4px 12px;
  border-radius: 999px;
  margin: 0 0 16px;
  font-weight: 500;
  letter-spacing: 0.3px;
}
.hero h1 {
  font-size: 44px;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.accent { color: var(--primary); }
.lede {
  font-size: 17px;
  color: var(--ink-soft);
  margin: 0 0 28px;
  max-width: 520px;
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  transition: all .2s;
  border: 1px solid transparent;
}
.btn.primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 12px rgba(48, 128, 254, 0.25);
}
.btn.primary:hover {
  background: var(--primary-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(48, 128, 254, 0.35);
}
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn.ghost:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* ===== Hero stats ===== */
.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  text-align: left;
  box-shadow: var(--shadow-sm);
}
.stat-card.accent-card {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.stat-num {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}
.stat-card.accent-card .stat-num { color: #fff; }
.stat-label {
  font-size: 12px;
  color: var(--ink-mute);
  margin-top: 4px;
  letter-spacing: 0.3px;
}
.stat-card.accent-card .stat-label { color: rgba(255, 255, 255, 0.85); }

/* ===== Section ===== */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-soft); }
.section-title {
  font-size: 28px;
  margin-bottom: 32px;
  position: relative;
  padding-left: 16px;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  background: var(--primary);
  border-radius: 2px;
}
.bio {
  font-size: 16px;
  color: var(--ink-soft);
  line-height: 1.8;
}
.tags {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tags li {
  padding: 6px 14px;
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 500;
}

/* ===== Post Grid ===== */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.post-loading {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--ink-mute);
  padding: 40px 0;
}
.post-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all .25s;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}
.post-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}
.post-thumb {
  width: 100%;
  height: 160px;
  background: var(--bg-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.post-thumb svg {
  width: 100%;
  height: 100%;
}
.post-body {
  padding: 18px 20px 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.post-meta {
  display: flex;
  gap: 10px;
  font-size: 12px;
  color: var(--ink-mute);
  margin-bottom: 8px;
  font-family: var(--font-mono);
}
.post-meta .tag {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 500;
}
.post-title {
  font-size: 18px;
  margin: 0 0 8px;
  color: var(--ink);
  line-height: 1.4;
}
.post-excerpt {
  font-size: 14px;
  color: var(--ink-soft);
  margin: 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.post-stats {
  display: flex;
  gap: 14px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
}
.post-stats span { display: inline-flex; align-items: center; gap: 4px; }

/* ===== Contact ===== */
.contact p { color: var(--ink-soft); }
.contact-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
}
.contact-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  color: var(--ink-soft);
}
.contact-list li:last-child { border-bottom: 0; }

/* ===== Footer ===== */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  background: var(--bg-soft);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--ink-mute);
}
.copyright { margin: 0; }
.beian { margin: 0; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.beian a { color: var(--ink-mute); display: inline-flex; align-items: center; gap: 4px; }
.beian a:hover { color: var(--primary); }
.beian .sep { color: var(--line); }
.beian-icon { width: 14px; height: 14px; display: inline-block; }

/* ===== Post Page (article) ===== */
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px 24px 80px;
}
.article-header { margin-bottom: 36px; }
.article-header h1 {
  font-size: 34px;
  line-height: 1.3;
  margin: 12px 0 16px;
  letter-spacing: -0.3px;
}
.article-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--ink-mute);
  font-family: var(--font-mono);
  flex-wrap: wrap;
}
.article-body {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}
.article-body p { margin: 0 0 18px; }
.article-body h2 {
  font-size: 22px;
  margin: 36px 0 14px;
  padding-left: 12px;
  border-left: 3px solid var(--primary);
}
.article-body h3 { font-size: 18px; margin: 28px 0 12px; }
.article-body blockquote {
  border-left: 3px solid var(--primary);
  background: var(--primary-light);
  padding: 12px 18px;
  margin: 20px 0;
  color: var(--ink-soft);
  border-radius: 0 8px 8px 0;
}
.article-body code {
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.92em;
}
.article-body pre {
  background: #0f1a2e;
  color: #cbd5e0;
  padding: 16px 20px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.6;
}
.article-body pre code {
  background: none;
  color: inherit;
  padding: 0;
}
.article-body img { border-radius: 8px; margin: 18px 0; }
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 14px;
}
.article-body th, .article-body td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
}
.article-body th { background: var(--bg-soft); font-weight: 600; }
.article-back {
  display: inline-block;
  margin-bottom: 24px;
  font-size: 14px;
  color: var(--ink-soft);
}
.article-back:hover { color: var(--primary); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero { padding: 56px 0 48px; }
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero h1 { font-size: 34px; }
  .lede { font-size: 15px; }
  .section { padding: 56px 0; }
  .section-title { font-size: 24px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; }
  .post-grid { grid-template-columns: 1fr; }
  .article { padding: 40px 20px 60px; }
  .article-header h1 { font-size: 26px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}