:root {
  --bg: #fafafa;
  --bg-alt: #ffffff;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #eff4ff;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.06);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.5px;
}

.brand:hover {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 28px;
  font-size: 15px;
  color: var(--text-muted);
}

.nav-links a {
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--accent);
}

.hero {
  padding: 120px 24px 96px;
  text-align: center;
}

.hero-inner {
  max-width: 680px;
  margin: 0 auto;
}

.avatar {
  width: 112px;
  height: 112px;
  margin: 0 auto 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), #7c3aed);
  color: #fff;
  font-size: 48px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.name {
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 12px;
}

.role {
  font-size: 19px;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 20px;
}

.bio {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 14px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

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

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.section {
  padding: 88px 24px;
}

.section-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.section-inner {
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 48px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: left;
}

.card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card-icon {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 8px;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.card p {
  font-size: 15px;
  color: var(--text-muted);
}

.contact-hint {
  color: var(--text-muted);
  margin-bottom: 32px;
}

.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

.chip {
  display: inline-block;
  padding: 10px 26px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  font-size: 15px;
  font-weight: 500;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.footer {
  padding: 40px 24px;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
}

@media (max-width: 768px) {
  .hero { padding: 80px 24px 64px; }
  .name { font-size: 34px; }
  .card-grid { grid-template-columns: 1fr; }
  .nav-links { gap: 18px; }
  .section { padding: 64px 24px; }
}