/* =========================================================
   Portfolio 主题样式
   ---------------------------------------------------------
   一个干净、克制的个人主页样式：浅色为主，跟随系统深色模式。
   中文优先字体栈。改动本文件即可调整全站外观。
   ========================================================= */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --text: #1f2328;
  --muted: #59636e;
  --border: #d8dee4;
  --accent: #4f46e5;
  --accent-strong: #4338ca;
  --card: #ffffff;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(31, 35, 40, 0.06), 0 4px 12px rgba(31, 35, 40, 0.05);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
          "Noto Sans CJK SC", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas,
          "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-soft: #161b22;
    --text: #e6edf3;
    --muted: #8b949e;
    --border: #30363d;
    --accent: #a5b4fc;
    --accent-strong: #c7d2fe;
    --card: #161b22;
    --shadow: 0 1px 2px rgba(1, 4, 9, 0.4), 0 4px 12px rgba(1, 4, 9, 0.3);
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 页头 ---------- */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 56px;
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 16px; color: var(--text); }
.brand:hover { color: var(--accent); }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav-link {
  padding: 5px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14.5px;
}
.nav-link:hover { color: var(--text); background: var(--bg-soft); }
.nav-link.active { color: var(--accent); font-weight: 600; }

/* ---------- 首屏 hero ---------- */
.hero { padding: 56px 0 24px; }
.hero-name {
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1.15;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.hero-role { font-size: 19px; margin: 0 0 10px; color: var(--accent); font-weight: 600; }
.hero-tagline {
  font-size: 16.5px;
  color: var(--muted);
  margin: 0 0 24px;
  max-width: 60ch;
}
.contact-row { display: flex; gap: 10px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 14.5px;
  color: var(--text);
  background: var(--card);
  transition: border-color .15s, color .15s, transform .05s;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 分节 ---------- */
.section { padding: 36px 0 12px; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}
.section-head h2 { font-size: 21px; margin: 0; }
.more { font-size: 14px; color: var(--muted); white-space: nowrap; }
.more:hover { color: var(--accent); }

/* ---------- 项目卡片网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  gap: 16px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform .12s ease, border-color .15s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: var(--text);
}
.card-title { font-size: 17px; margin: 0; line-height: 1.4; }
.card-desc {
  color: var(--muted);
  font-size: 14px;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-foot {
  margin-top: auto;
  padding-top: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 13px;
}
.card-foot .card-arrow { color: var(--accent); }

/* ---------- 文章列表 ---------- */
.post-list { list-style: none; margin: 0; padding: 0; }
.post-item {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
}
.post-item:last-child { border-bottom: none; }
.post-date { color: var(--muted); font-size: 13.5px; flex-shrink: 0; min-width: 88px; }
.post-title { color: var(--text); font-weight: 500; }
.post-title:hover { color: var(--accent); }

.empty { color: var(--muted); font-size: 14.5px; }
code { font-family: var(--mono); font-size: 0.9em; }

/* ---------- 标签 ---------- */
.tag-row { display: flex; gap: 6px; flex-wrap: wrap; }
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.6;
}

/* ---------- 文章 / 页面正文 ---------- */
.list-page { padding: 28px 0 48px; }
.prose { padding: 32px 0 56px; max-width: 720px; }
.page-head { margin-bottom: 26px; }
.page-head h1 { font-size: clamp(26px, 4vw, 34px); margin: 0 0 8px; line-height: 1.25; }
.page-head .meta { color: var(--muted); font-size: 14px; }
.page-head .dot { margin: 0 6px; }
.page-head .tag-row { margin-top: 12px; }
.project-links { margin-top: 14px; display: flex; gap: 10px; flex-wrap: wrap; }

.content { font-size: 16.5px; }
.content h2 { font-size: 23px; margin: 1.8em 0 0.7em; padding-bottom: 0.3em; border-bottom: 1px solid var(--border); }
.content h3 { font-size: 19px; margin: 1.6em 0 0.5em; }
.content p { margin: 0 0 1.15em; }
.content ul, .content ol { margin: 0 0 1.15em; padding-left: 1.5em; }
.content li { margin: 0.3em 0; }
.content blockquote {
  margin: 1.2em 0;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
.content pre {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
  font-family: var(--mono);
}
.content code { background: var(--bg-soft); padding: 2px 6px; border-radius: 5px; }
.content pre code { background: none; padding: 0; border-radius: 0; }
.content img { max-width: 100%; border-radius: 10px; border: 1px solid var(--border); }
.content table { border-collapse: collapse; width: 100%; margin: 1.2em 0; font-size: 15px; }
.content th, .content td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.content th { background: var(--bg-soft); }
.lead { color: var(--muted); font-size: 16px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 13.5px;
}
.footer-meta { color: var(--muted); }

/* ---------- 窄屏适配 ---------- */
@media (max-width: 560px) {
  .hero { padding-top: 36px; }
  .post-item { flex-direction: column; gap: 2px; }
  .header-inner { height: auto; padding: 10px 20px; }
  .footer-inner { flex-direction: column; text-align: center; }
}