/* =========================================================
   个人简介网站 · 样式表
   想换整体风格？只改下面 :root 里的 6 个颜色变量就够了。
   ========================================================= */

:root {
  /* —— 配色（浅色模式）—— */
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --line: #e6e6e6;
  --card: #fafafa;
  --accent: #3b5bdb;

  /* —— 版式 —— */
  --container: 1080px;
  --radius: 12px;
  --font: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Hiragino Sans GB", system-ui, -apple-system, "Segoe UI", sans-serif;
}

/* 系统开了深色模式就自动切（不用做开关） */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --text: #e8e8e8;
    --muted: #a0a0a0;
    --line: #2a2a2a;
    --card: #1a1a1a;
    --accent: #8ba4ff;
  }
}

/* ---------- 基础重置 ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

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

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

/* 键盘 Tab 时能看到焦点，别删这条 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
  letter-spacing: 0.02em;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.site-nav { display: flex; gap: 24px; }
.site-nav a { color: var(--muted); font-size: 15px; }
.site-nav a:hover { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 10px 8px;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- 首屏 ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: center;
  padding-top: 96px;
  padding-bottom: 96px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: 0.08em;
}

.hero h1 {
  margin: 0 0 16px;
  font-size: 56px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 0 32px;
  color: var(--muted);
  font-size: 18px;
  max-width: 34em;
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform .15s ease, opacity .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { color: #fff; opacity: .9; }

.btn-ghost { border: 1px solid var(--line); color: var(--text); }

.hero-media img {
  width: 240px;
  height: 240px;
  border-radius: 50%;
  border: 1px solid var(--line);
  margin-left: auto;
}

/* ---------- 通用区块 ---------- */
.section { padding: 64px 24px; }

.section-title {
  margin: 0 0 8px;
  font-size: 28px;
  line-height: 1.3;
}

.section-lead { margin: 0 0 40px; color: var(--muted); font-size: 15px; }

.section-body { max-width: 720px; }

.prose p { margin: 0 0 16px; }

/* ---------- 时间线 ---------- */
.timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 32px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--line);
}

.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-item:last-child { margin-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-item h3 { margin: 0 0 4px; font-size: 20px; line-height: 1.4; }
.timeline-item .time { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.timeline-item p { margin: 0 0 8px; }

/* ---------- 卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  padding: 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.7; }

/* ---------- 联系方式 ---------- */
.contact-list { margin: 0; padding-left: 20px; }
.contact-list li { margin-bottom: 8px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0;
  color: var(--muted);
  font-size: 14px;
}
.site-footer p { margin: 0; }

/* ---------- 滚动淡入（JS 加上 html.js 之后才生效，关 JS 也能正常看） ---------- */
@media (prefers-reduced-motion: no-preference) {
  html.js [data-reveal] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity .6s ease, transform .6s ease;
  }
  html.js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 手机端（768px 以下） ---------- */
@media (max-width: 768px) {
  body { font-size: 16px; }

  .nav-toggle { display: block; }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--line); }
  .site-nav a:last-child { border-bottom: none; }

  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 56px;
    padding-bottom: 56px;
    text-align: left;
  }
  .hero h1 { font-size: 40px; }
  .hero-media img { width: 120px; height: 120px; margin-left: 0; }

  .section { padding: 48px 24px; }
  .section-title { font-size: 24px; }

  .timeline { padding-left: 28px; }
  .timeline::before { left: 9px; }
  .timeline-item::before { left: -23px; }
}