/* ===== 基础重置 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0f1117;
  --bg-soft: #161a23;
  --card: #1a1f2b;
  --border: #262d3d;
  --text: #e6e9f0;
  --text-dim: #9aa3b5;
  --primary: #6366f1;
  --primary-light: #8b5cf6;
  --accent: #22d3ee;
  --radius: 16px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

html {
  scroll-behavior: smooth;
}

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

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

ul {
  list-style: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

code {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.9em;
  color: var(--accent);
}

/* ===== 导航栏 ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 17, 23, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  border-bottom-color: var(--border);
  background: rgba(15, 17, 23, 0.95);
}

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

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

.logo span {
  color: var(--primary-light);
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 15px;
  color: var(--text-dim);
  transition: color 0.25s;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: all 0.3s;
}

/* ===== 首屏 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: 96px 0 60px;
  background: radial-gradient(ellipse 80% 60% at 20% 20%, rgba(99, 102, 241, 0.18), transparent),
    radial-gradient(ellipse 60% 50% at 85% 75%, rgba(34, 211, 238, 0.12), transparent);
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  align-items: center;
  gap: 48px;
}

.hero-greeting {
  color: var(--accent);
  font-size: 18px;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

.hero-name {
  font-size: clamp(44px, 7vw, 72px);
  font-weight: 800;
  line-height: 1.1;
  background: linear-gradient(120deg, #fff, var(--primary-light), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 16px;
}

.hero-role {
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--text-dim);
  margin-bottom: 20px;
}

.hero-desc {
  color: var(--text-dim);
  max-width: 560px;
  margin-bottom: 32px;
  font-size: 16px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  transition: all 0.25s;
}

.btn-primary {
  background: linear-gradient(120deg, var(--primary), var(--primary-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.55);
}

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

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

.hero-social {
  display: flex;
  gap: 18px;
}

.hero-social a {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-dim);
  transition: all 0.25s;
}

.hero-social a:hover {
  color: #fff;
  border-color: var(--primary);
  background: var(--primary);
  transform: translateY(-3px);
}

.hero-avatar {
  display: flex;
  justify-content: center;
}

.avatar-ring {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  padding: 10px;
  background: conic-gradient(from 0deg, var(--primary), var(--accent), var(--primary-light), var(--primary));
  animation: rotate-glow 8s linear infinite;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes rotate-glow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 120px;
}

.scroll-hint {
  position: absolute;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 2px solid var(--text-dim);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.scroll-hint span {
  width: 4px;
  height: 8px;
  background: var(--text-dim);
  border-radius: 2px;
  animation: scroll-dot 1.6s ease-in-out infinite;
}

@keyframes scroll-dot {
  0% { opacity: 1; transform: translateY(0); }
  70% { opacity: 0; transform: translateY(14px); }
  100% { opacity: 0; transform: translateY(14px); }
}

/* ===== 通用 Section ===== */
.section {
  padding: 100px 0;
}

.section-title {
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  text-align: center;
}

.section-sub {
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 56px;
  margin-top: 4px;
}

/* ===== 关于我 ===== */
.about {
  background: var(--bg-soft);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 16px;
  font-size: 15.5px;
}

.about-points {
  margin-top: 24px;
}

.about-points li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 12px;
  color: var(--text);
  font-size: 15px;
}

.about-points li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-light);
  font-weight: 700;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: transform 0.25s, border-color 0.25s;
}

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

.stat-num {
  display: block;
  font-size: 34px;
  font-weight: 800;
  background: linear-gradient(120deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  color: var(--text-dim);
  font-size: 14px;
}

/* ===== 技能 ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.skill-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  transition: transform 0.25s, border-color 0.25s;
}

.skill-card:hover {
  transform: translateY(-6px);
  border-color: var(--primary);
}

.skill-icon {
  font-size: 34px;
  margin-bottom: 14px;
}

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

.skill-card p {
  color: var(--text-dim);
  font-size: 14px;
  margin-bottom: 20px;
}

.skill-bar {
  height: 6px;
  border-radius: 3px;
  background: var(--bg-soft);
  overflow: hidden;
}

.skill-bar i {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  animation: grow-bar 1.2s ease-out;
}

@keyframes grow-bar {
  from { width: 0; }
}

/* ===== 项目 ===== */
.projects {
  background: var(--bg-soft);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.3s, box-shadow 0.3s;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow);
}

.project-banner {
  height: 150px;
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 16px;
}

.project-tag {
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(6px);
  color: #fff;
  font-size: 12px;
  padding: 4px 12px;
  border-radius: 20px;
}

.project-body {
  padding: 24px;
}

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

.project-body p {
  color: var(--text-dim);
  font-size: 14.5px;
  margin-bottom: 18px;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-meta span {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--accent);
  font-size: 12.5px;
  padding: 3px 12px;
  border-radius: 20px;
}

/* ===== 联系 ===== */
.contact-text {
  text-align: center;
  color: var(--text-dim);
  margin-bottom: 40px;
}

.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 760px;
  margin: 0 auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 32px 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.25s;
  font-size: 15px;
}

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

.contact-ico {
  font-size: 30px;
}

/* ===== 页脚 ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 14px;
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions,
  .hero-social {
    justify-content: center;
  }

  .avatar-ring {
    width: 220px;
    height: 220px;
  }

  .avatar {
    font-size: 90px;
  }

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

  .nav-links {
    position: fixed;
    top: 64px;
    right: -100%;
    flex-direction: column;
    background: var(--bg-soft);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    width: 220px;
    padding: 24px;
    gap: 20px;
    transition: right 0.3s ease;
  }

  .nav-links.open {
    right: 0;
  }

  .menu-toggle {
    display: flex;
  }
}