:root {
  --bg: #0f1117;
  --bg-alt: #161a24;
  --card: #1c2130;
  --text: #e6e9f0;
  --muted: #9aa3b5;
  --primary: #6366f1;
  --primary-2: #8b5cf6;
  --border: rgba(255, 255, 255, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

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

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

/* 导航栏 */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.menu {
  display: flex;
  gap: 28px;
}

.menu a {
  font-size: 15px;
  color: var(--muted);
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(99, 102, 241, 0.18), transparent 55%);
  padding: 40px 24px;
}

.hero-inner {
  max-width: 640px;
}

.avatar {
  width: 96px;
  height: 96px;
  margin: 0 auto 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 34px;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
}

.hero h1 {
  font-size: 44px;
  font-weight: 800;
  letter-spacing: 1px;
}

.tagline {
  margin-top: 12px;
  font-size: 18px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 600;
}

.intro {
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
}

.hero-actions {
  margin-top: 36px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
}

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

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

/* 区块 */
.section {
  padding: 90px 24px;
}

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

.container {
  max-width: 1000px;
  margin: 0 auto;
}

.section-title {
  font-size: 30px;
  font-weight: 800;
  text-align: center;
  margin-bottom: 48px;
}

.section-title::after {
  content: "";
  display: block;
  width: 48px;
  height: 4px;
  margin: 14px auto 0;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
}

/* 关于 */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}

.about-card h3 {
  font-size: 20px;
  margin-bottom: 14px;
}

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

.about-card ul {
  list-style: none;
}

.about-card li {
  padding: 4px 0;
}

.about-card li::before {
  content: "▸";
  color: var(--primary);
  margin-right: 8px;
}

/* 技能 */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.skill-name {
  font-size: 17px;
  font-weight: 700;
}

.skill-bar {
  height: 8px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  margin-top: 14px;
  overflow: hidden;
}

.skill-bar span {
  display: block;
  height: 100%;
  border-radius: 8px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
}

/* 项目 */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  transition: transform 0.25s, border-color 0.25s;
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.project-card h3 {
  font-size: 19px;
  margin-bottom: 10px;
}

.project-card p {
  color: var(--muted);
  font-size: 14px;
}

.project-tags {
  margin-top: 16px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

/* 联系 */
.contact-note {
  text-align: center;
  color: var(--muted);
  margin-bottom: 32px;
}

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

.contact-link {
  padding: 12px 24px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.2s, border-color 0.2s;
}

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

/* 页脚 */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 32px;
  }

  .menu {
    gap: 16px;
  }

  .section {
    padding: 60px 20px;
  }
}