:root {
  --bg: #fafafa;
  --bg-alt: #f1f3f5;
  --surface: #ffffff;
  --text: #1f2933;
  --text-muted: #52606d;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --border: #e4e7eb;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --max-width: 960px;
}

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

html {
  scroll-behavior: smooth;
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

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

.brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

.hero {
  padding: 96px 0 72px;
  text-align: center;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.avatar-wrap {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--surface);
  border: 4px solid #fff;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.avatar {
  width: 100%;
  height: 100%;
  display: block;
}

.hero-greeting {
  font-size: 1.05rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.hero-name {
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 560px;
  margin-bottom: 12px;
}

.hero-motto {
  font-style: italic;
  color: var(--primary);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-outline {
  border: 1.5px solid var(--border);
  color: var(--text);
  background: var(--surface);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-size: 1.7rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: var(--primary);
  margin: 12px auto 0;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

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

.about-card h3 {
  font-size: 1.05rem;
  margin-bottom: 12px;
  color: var(--primary-dark);
}

.about-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.skill-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.skill-list li {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 0.85rem;
  color: var(--text);
}

.contact-note {
  text-align: center;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

.contact-item {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}

.contact-item:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.site-footer {
  padding: 32px 0;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 560px) {
  .hero {
    padding: 64px 0 48px;
  }

  .section {
    padding: 56px 0;
  }
}