@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@500;600;700&display=swap');

/* Elmh 博客 — 与主页一致的暗色简约风 */
:root {
  --bg: #0b0e13;
  --surface: #11151d;
  --surface-2: #161b25;
  --fg: #eef1f6;
  --muted: #97a2b3;
  --faint: #6b7686;
  --line: rgba(255, 255, 255, 0.09);
  --accent: #7aa5ff;
  --gold: #e0b872;
  --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Noto Serif SC', 'Songti SC', 'STSong', 'Georgia', serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    radial-gradient(1100px 560px at 50% -8%, rgba(122, 165, 255, 0.16), transparent 62%),
    radial-gradient(820px 480px at 100% 6%, rgba(224, 184, 114, 0.12), transparent 58%);
  background-size:
    44px 44px,
    44px 44px,
    auto,
    auto;
  background-repeat:
    repeat,
    repeat,
    no-repeat,
    no-repeat;
  background-attachment: fixed;
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: #0b0e13; }

a { color: inherit; }

.container { max-width: 740px; margin: 0 auto; padding: 64px 24px 80px; }

/* --- 头部 --- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 46px;
}
.logo {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: 0.5px;
  color: #fff;
}
.logo .brand-dot { color: var(--accent); }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  margin-left: 0;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 99px;
  transition: color 0.2s, background 0.2s;
}
.nav a:hover { color: #fff; }
.nav a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.09);
  font-weight: 600;
}

/* --- 分类筛选 --- */
.cat-filter { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 34px; }
.cat-btn {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 17px;
  font-size: 13px;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.2s;
}
.cat-btn:hover { border-color: var(--accent); color: #fff; }
.cat-btn.active { background: var(--accent); border-color: var(--accent); color: #0b0e13; }

/* --- 文章列表 --- */
.post-list { display: flex; flex-direction: column; }
.post-item {
  display: block;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  transition: transform 0.25s ease;
}
.post-item:first-child { padding-top: 6px; }
.post-item:hover { transform: translateX(6px); }
.post-date { font-size: 13px; color: var(--faint); letter-spacing: 0.04em; }
.post-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 600;
  margin: 8px 0 9px;
  color: #fff;
  transition: color 0.2s;
}
.post-item:hover .post-title { color: var(--accent); }
.post-excerpt { font-size: 14px; color: var(--muted); }
.post-empty { padding: 60px 0; text-align: center; color: var(--muted); font-size: 14px; }

/* --- 文章页 --- */
.post-header { margin-bottom: 40px; }
.post-header h1 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 14px;
  letter-spacing: 0.2px;
  color: #fff;
}
.post-meta { font-size: 13.5px; color: var(--muted); display: flex; gap: 18px; flex-wrap: wrap; }
.post-body { font-size: 16px; color: #d5dae2; }
.post-body h2 { font-family: var(--font-display); font-size: 24px; font-weight: 700; margin: 44px 0 16px; color: #fff; }
.post-body h3 { font-family: var(--font-display); font-size: 20px; font-weight: 650; margin: 34px 0 13px; color: #fff; }
.post-body p { margin: 14px 0; }
.post-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.post-body img { max-width: 100%; border-radius: 12px; margin: 20px 0; display: block; cursor: zoom-in; border: 1px solid var(--line); }
.post-body code {
  background: var(--surface-2);
  border-radius: 6px;
  padding: 2px 7px;
  font-size: 14px;
  color: #c9d5ff;
  font-family: "Cascadia Code", Consolas, monospace;
}
.post-body pre {
  background: #0d1117;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 20px 0;
}
.post-body pre code { background: none; padding: 0; font-size: 13.5px; color: #d5dae2; }
.post-body blockquote {
  border-left: 3px solid var(--gold);
  background: rgba(224, 184, 114, 0.07);
  border-radius: 0 10px 10px 0;
  padding: 12px 0 12px 20px;
  margin: 20px 0;
  color: #e6d6b5;
}
.post-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14.5px; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: 9px 14px; text-align: left; }
.post-body th { font-weight: 600; background: var(--surface-2); color: #fff; }
.post-body ul, .post-body ol { margin: 14px 0; padding-left: 26px; color: #d5dae2; }
.post-body hr { border: none; border-top: 1px solid var(--line); margin: 36px 0; }
.post-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 48px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: 99px;
  transition: all 0.2s;
}
.post-back:hover { color: #fff; border-color: var(--accent); }
.post-404 { text-align: center; padding: 80px 0; color: var(--muted); }
.post-404 h2 { font-size: 26px; color: #fff; margin: 16px 0; }

/* --- 图片灯箱 --- */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(4, 6, 9, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
  cursor: zoom-out;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.lightbox.open { display: flex; }
.lightbox img { max-width: 88%; max-height: 88%; border-radius: 10px; }

/* --- 页脚 --- */
.site-footer {
  margin-top: 64px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--muted);
}
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: #fff; }

/* --- 响应式 --- */
@media (max-width: 560px) {
  .container { padding: 40px 20px 60px; }
  .site-header { flex-direction: column; gap: 16px; }
  .post-header h1 { font-size: 25px; }
}