:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --line: #e6e6e6;
  --accent: #4f46e5;
  --accent-soft: #eef2ff;
  --radius: 14px;
}

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

html {
  scroll-behavior: smooth;
}

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

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(250, 250, 250, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

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

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

.nav-links a {
  margin-left: 28px;
  font-size: 15px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ---------- Hero ---------- */
.hero {
  padding: 96px 24px 72px;
  text-align: center;
}

.avatar-wrap {
  width: 120px;
  height: 120px;
  margin: 0 auto 28px;
  border-radius: 50%;
  padding: 4px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
}

.avatar {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--surface);
}

.hero-title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}

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

.hero-subtitle {
  font-size: clamp(16px, 2.4vw, 19px);
  color: var(--muted);
  max-width: 520px;
  margin: 0 auto 36px;
}

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

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s 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 4px 16px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: #4338ca;
}

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

.btn-ghost:hover {
  background: var(--surface);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

/* ---------- Sections ---------- */
.section {
  padding: 64px 0;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 24px;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 36px;
}

.section-title {
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.about-text {
  color: var(--muted);
  margin-bottom: 14px;
}

.about-text:last-child {
  margin-bottom: 0;
}

.detail-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
}

.detail-list {
  list-style: none;
}

.detail-list li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 14.5px;
}

.detail-list li:last-child {
  border-bottom: none;
}

.detail-list li span:first-child {
  color: var(--muted);
  white-space: nowrap;
}

.detail-list li span:last-child {
  text-align: right;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  margin-top: 32px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.footer-links a {
  margin-left: 20px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .hero {
    padding: 64px 24px 48px;
  }

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

  .nav-links a {
    margin-left: 18px;
  }
}