/* ============================================================
   个人 AI 技术博客 —— 共享样式
   配色：靛蓝/紫渐变强调色，浅色为主，自动适配深色模式
   ============================================================ */

:root {
  --bg: #f7f8fc;
  --bg-card: #ffffff;
  --text: #15172b;
  --text-soft: #4b5168;
  --text-mute: #8b90a6;
  --line: #e7e9f2;
  --accent: #5b54e6;
  --accent-2: #8b5cf6;
  --accent-soft: rgba(91, 84, 230, 0.10);
  --code-bg: #f3f4fb;
  --shadow: 0 10px 30px rgba(28, 30, 64, 0.07);
  --radius: 18px;
  --maxw: 1080px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0f1d;
    --bg-card: #161a2e;
    --text: #eceef7;
    --text-soft: #b6bad0;
    --text-mute: #7e84a0;
    --line: #262a44;
    --accent: #8b85ff;
    --accent-2: #b794ff;
    --accent-soft: rgba(139, 133, 255, 0.14);
    --code-bg: #1d2138;
    --shadow: 0 14px 40px rgba(0, 0, 0, 0.35);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.2px;
}
.brand .logo {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center;
  color: #fff; font-size: 15px; font-weight: 800;
  box-shadow: 0 6px 16px rgba(91, 84, 230, 0.35);
}
.nav-links { display: flex; gap: 26px; font-size: 15px; }
.nav-links a { color: var(--text-soft); transition: color .2s; }
.nav-links a:hover { color: var(--accent); }
@media (max-width: 560px) { .nav-links { gap: 18px; font-size: 14px; } }

/* ---------- 容器 ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Hero ---------- */
.hero {
  padding: 84px 24px 60px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; color: var(--accent);
  background: var(--accent-soft);
  padding: 6px 14px; border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(34px, 6vw, 56px);
  line-height: 1.12;
  margin: 0 0 20px;
  letter-spacing: -0.5px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--text-soft);
  max-width: 640px;
  margin: 0 0 30px;
}
.btn-row { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 12px;
  font-weight: 600; font-size: 15px;
  transition: transform .15s, box-shadow .2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: 0 10px 24px rgba(91, 84, 230, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  border: 1px solid var(--line);
  color: var(--text-soft);
  background: var(--bg-card);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 区块标题 ---------- */
.section { padding: 30px 0 10px; }
.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 26px; flex-wrap: wrap; gap: 8px;
}
.section-head h2 { font-size: 26px; margin: 0; letter-spacing: -0.3px; }
.section-head .hint { color: var(--text-mute); font-size: 14px; }

/* ---------- 文章卡片网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
  padding-bottom: 24px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .25s, border-color .25s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--accent) 40%, var(--line));
}
.card .tags { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.tag {
  font-size: 12px; font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px; border-radius: 7px;
}
.card h3 { font-size: 19px; margin: 0 0 10px; line-height: 1.35; }
.card p { color: var(--text-soft); font-size: 14.5px; margin: 0 0 18px; flex: 1; }
.card .meta {
  display: flex; align-items: center; justify-content: space-between;
  color: var(--text-mute); font-size: 13px;
  border-top: 1px solid var(--line); padding-top: 14px;
}
.card .readmore { color: var(--accent); font-weight: 600; }
.card.soon { opacity: .6; }
.card.soon .readmore { color: var(--text-mute); }

/* ---------- About ---------- */
.about-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 34px;
  display: grid; grid-template-columns: auto 1fr; gap: 28px;
  align-items: center;
}
.avatar {
  width: 96px; height: 96px; border-radius: 24px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center;
  color: #fff; font-size: 38px; font-weight: 800;
  box-shadow: 0 10px 26px rgba(91, 84, 230, 0.4);
}
.about-card h3 { margin: 0 0 8px; font-size: 22px; }
.about-card p { margin: 0; color: var(--text-soft); }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.chip {
  font-size: 13px; color: var(--text-soft);
  border: 1px solid var(--line); border-radius: 999px;
  padding: 5px 13px;
}
@media (max-width: 560px) {
  .about-card { grid-template-columns: 1fr; text-align: center; }
  .avatar { margin: 0 auto; }
  .chips { justify-content: center; }
}

/* ---------- 文章详情页 ---------- */
.article { max-width: 740px; margin: 0 auto; padding: 56px 24px 20px; }
.article .back { color: var(--text-mute); font-size: 14px; }
.article .back:hover { color: var(--accent); }
.article-head { margin: 24px 0 36px; }
.article-head .tags { margin-bottom: 18px; }
.article-head h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.2; margin: 0 0 16px; letter-spacing: -0.5px;
}
.article-head .meta { color: var(--text-mute); font-size: 14px; }
.prose { font-size: 17px; color: var(--text); }
.prose p { margin: 0 0 20px; color: var(--text-soft); }
.prose h2 {
  font-size: 23px; margin: 40px 0 14px; letter-spacing: -0.3px;
  padding-left: 14px; border-left: 4px solid var(--accent);
}
.prose h3 { font-size: 19px; margin: 28px 0 10px; }
.prose ul, .prose ol { color: var(--text-soft); padding-left: 22px; margin: 0 0 20px; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--text); }
.prose blockquote {
  margin: 24px 0; padding: 14px 20px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  color: var(--text-soft); font-style: italic;
}
.prose code {
  background: var(--code-bg);
  padding: 2px 7px; border-radius: 6px;
  font-family: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  font-size: 0.88em; color: var(--accent);
}
.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 20px;
  overflow-x: auto; margin: 0 0 22px;
}
.prose pre code { background: none; padding: 0; color: var(--text); font-size: 13.5px; line-height: 1.6; }

/* ---------- 页脚 + 备案 ---------- */
.footer {
  border-top: 1px solid var(--line);
  margin-top: 60px;
  padding: 36px 24px 44px;
  text-align: center;
  color: var(--text-mute);
  font-size: 13.5px;
}
.footer .links { display: flex; gap: 20px; justify-content: center; margin-bottom: 14px; flex-wrap: wrap; }
.footer .links a { color: var(--text-soft); }
.footer .links a:hover { color: var(--accent); }
.beian { margin-top: 10px; line-height: 1.9; }
.beian a { color: var(--text-mute); }
.beian a:hover { color: var(--accent); text-decoration: underline; }
.beian .gongan { display: inline-flex; align-items: center; gap: 5px; }