:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --line: #d7e0ec;
  --text: #1c2430;
  --muted: #5f6b7a;
  --brand: #2267f2;
  --brand-soft: #eaf1ff;
  --shadow: 0 16px 40px rgba(24, 42, 72, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(34, 103, 242, 0.08), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.7;
}

a {
  color: inherit;
}

.shell {
  max-width: 1440px;
  margin: 0 auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 24px;
}

.sidebar {
  position: sticky;
  top: 24px;
  align-self: start;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.brand h1,
.hero h2,
.section-head h2,
.project h3,
.skill-block h3,
.intro-block h3 {
  margin: 0;
}

.brand p,
.hero p,
.project p,
.intro-block p,
.card li,
details p {
  margin: 0;
}

.eyebrow {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--brand);
}

.muted {
  color: var(--muted);
}

.toc {
  margin-top: 28px;
  display: grid;
  gap: 10px;
}

.toc a {
  padding: 10px 12px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--muted);
  transition: 0.2s ease;
}

.toc a:hover {
  background: var(--brand-soft);
  color: var(--brand);
}

.content {
  min-width: 0;
  display: grid;
  gap: 24px;
}

.card {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel-strong);
  box-shadow: var(--shadow);
}

.hero {
  padding: 36px;
}

.hero-grid {
  margin-top: 24px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.hero-grid div {
  padding: 18px;
  border-radius: 18px;
  background: var(--brand-soft);
  border: 1px solid #dbe6ff;
}

.metric {
  display: block;
  font-size: 28px;
  font-weight: 800;
  color: var(--brand);
}

.label {
  color: var(--muted);
  font-size: 14px;
}

.section-head {
  margin-bottom: 18px;
}

.project,
.skill-block,
.intro-block,
.qa-group {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.project:first-of-type,
.skill-block:first-of-type,
.intro-block:first-of-type,
.qa-group:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.project,
.intro-block {
  display: grid;
  gap: 10px;
}

.skill-block {
  display: grid;
  gap: 14px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  padding: 8px 12px;
  border-radius: 999px;
  background: #f4f8ff;
  border: 1px solid #dce7ff;
  color: #35548d;
  font-size: 14px;
}

.tips ul {
  margin: 0;
  padding-left: 20px;
}

.qa-group {
  display: grid;
  gap: 12px;
}

.qa-group h3 {
  margin: 0 0 6px;
}

details {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fbfcff;
  overflow: hidden;
}

summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 18px;
  font-weight: 700;
}

summary::-webkit-details-marker {
  display: none;
}

details[open] summary {
  border-bottom: 1px solid var(--line);
  background: #f5f8ff;
}

details p {
  padding: 16px 18px 18px;
  color: #334154;
}

@media (max-width: 1080px) {
  .shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .toc {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .shell {
    padding: 14px;
    gap: 14px;
  }

  .sidebar,
  .card,
  .hero {
    padding: 20px;
    border-radius: 20px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .toc {
    grid-template-columns: 1fr;
  }

  summary {
    padding: 14px 16px;
  }

  details p {
    padding: 14px 16px 16px;
  }
}