/* ===== CSS 变量 ===== */
:root {
  --bg-primary: #080810;
  --bg-secondary: #0e0e1a;
  --bg-card: #13131f;
  --bg-card-hover: #1a1a2e;
  --border: rgba(99, 102, 241, 0.15);
  --border-hover: rgba(99, 102, 241, 0.4);
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent-1: #6366f1;
  --accent-2: #a855f7;
  --accent-3: #06b6d4;
  --gradient: linear-gradient(135deg, #6366f1, #a855f7);
  --gradient-text: linear-gradient(135deg, #818cf8, #c084fc);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --radius: 16px;
  --radius-sm: 8px;
  --nav-height: 70px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置与基础 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-1); border-radius: 3px; }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(99,102,241,0.3); }
  50% { box-shadow: 0 0 40px rgba(99,102,241,0.6); }
}
@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 导航 ===== */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: rgba(8, 8, 16, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}
.nav.scrolled {
  box-shadow: 0 4px 30px rgba(0,0,0,0.5);
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-size: 1.3rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-link {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(99,102,241,0.1);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--gradient);
  border-radius: 1px;
}
.nav-cta {
  padding: 8px 20px;
  background: var(--gradient);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff !important;
  transition: var(--transition);
}
.nav-cta:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(99,102,241,0.4);
}
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

/* ===== 布局容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.section {
  padding: 100px 0;
}
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  color: #818cf8;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-title .highlight {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}
.btn-primary {
  background: var(--gradient);
  color: #fff;
}
.btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99,102,241,0.4);
}
.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}
.btn-outline:hover {
  background: rgba(99,102,241,0.1);
  border-color: var(--accent-1);
  transform: translateY(-2px);
}
.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
}
.card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

/* ===== Hero 区块 ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
}
.hero-orb-1 {
  width: 600px; height: 600px;
  background: #6366f1;
  top: -200px; right: -100px;
  animation: float 8s ease-in-out infinite;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  background: #a855f7;
  bottom: -100px; left: -100px;
  animation: float 10s ease-in-out infinite reverse;
}
.hero-orb-3 {
  width: 300px; height: 300px;
  background: #06b6d4;
  top: 50%; left: 40%;
  animation: float 12s ease-in-out infinite 2s;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(99,102,241,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99,102,241,0.05) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(99,102,241,0.1);
  border: 1px solid rgba(99,102,241,0.3);
  border-radius: 100px;
  font-size: 0.8rem;
  color: #818cf8;
  margin-bottom: 24px;
}
.hero-badge-dot {
  width: 8px; height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse-glow 2s ease-in-out infinite;
  box-shadow: 0 0 6px #22c55e;
}
.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 12px;
}
.hero-title .name {
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--accent-3);
  font-weight: 600;
  margin-bottom: 20px;
}
.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 480px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-avatar-wrap {
  position: relative;
  width: 320px;
  height: 320px;
}
.hero-avatar-ring {
  position: absolute;
  inset: -20px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: linear-gradient(var(--bg-primary), var(--bg-primary)) padding-box,
              var(--gradient) border-box;
  animation: spin 8s linear infinite;
}
.hero-avatar-ring::before {
  content: '';
  position: absolute;
  top: -6px; left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  background: var(--accent-1);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-1);
}
.hero-avatar-img {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--bg-card);
  position: relative;
  z-index: 1;
  animation: float 6s ease-in-out infinite;
}
.hero-stats {
  position: absolute;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.hero-stats.left { left: -60px; top: 50%; transform: translateY(-50%); }
.hero-stats.right { right: -60px; top: 50%; transform: translateY(-50%); }
.stat-pill {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  text-align: center;
  box-shadow: var(--shadow-card);
}
.stat-pill-num {
  font-size: 1.3rem;
  font-weight: 800;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-pill-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 0.8rem;
}
.scroll-indicator {
  width: 24px; height: 38px;
  border: 2px solid var(--border-hover);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--accent-1);
  border-radius: 2px;
  animation: float 1.5s ease-in-out infinite;
}

/* ===== 技能区 ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}
.skill-card {
  padding: 28px;
}
.skill-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}
.skill-icon.purple { background: rgba(99,102,241,0.15); }
.skill-icon.pink { background: rgba(168,85,247,0.15); }
.skill-icon.cyan { background: rgba(6,182,212,0.15); }
.skill-icon.green { background: rgba(34,197,94,0.15); }
.skill-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 16px; }
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-tag {
  padding: 4px 12px;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: var(--transition);
}
.skill-tag:hover {
  background: rgba(99,102,241,0.15);
  color: var(--text-primary);
}

/* ===== 项目展示 ===== */
.projects-filter {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.filter-btn {
  padding: 8px 20px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  background: var(--gradient);
  border-color: transparent;
  color: #fff;
}
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}
.project-card {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.project-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}
.project-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.project-card:hover .project-img img {
  transform: scale(1.05);
}
.project-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, rgba(8,8,16,0.9));
}
.project-category-badge {
  position: absolute;
  top: 16px; left: 16px;
  padding: 4px 12px;
  background: rgba(8,8,16,0.8);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  backdrop-filter: blur(8px);
}
.project-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.project-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}
.project-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
  flex: 1;
}
.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.project-tag {
  padding: 3px 10px;
  background: rgba(99,102,241,0.08);
  border: 1px solid rgba(99,102,241,0.15);
  border-radius: 100px;
  font-size: 0.75rem;
  color: #818cf8;
}
.project-links {
  display: flex;
  gap: 10px;
}

/* ===== 关于我页 ===== */
.about-hero {
  padding: 140px 0 80px;
  background: radial-gradient(ellipse at 50% 0%, rgba(99,102,241,0.1) 0%, transparent 70%);
}
.about-hero-inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 80px;
  align-items: start;
}
.about-avatar {
  position: relative;
}
.about-avatar-img {
  width: 100%;
  border-radius: var(--radius);
  border: 2px solid var(--border);
}
.about-avatar-card {
  position: absolute;
  bottom: -24px;
  right: -24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.about-stat {
  display: flex;
  align-items: center;
  gap: 12px;
}
.about-stat-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: rgba(99,102,241,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}
.about-stat-num { font-size: 1.1rem; font-weight: 700; }
.about-stat-label { font-size: 0.75rem; color: var(--text-muted); }
.about-content h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.about-content .subtitle {
  color: var(--accent-3);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 28px;
}
.about-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}
.about-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 32px; }

/* 时间线 */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent-1), var(--accent-2), transparent);
}
.timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -34px; top: 8px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--accent-1);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 10px rgba(99,102,241,0.5);
}
.timeline-period {
  font-size: 0.8rem;
  color: var(--accent-1);
  font-weight: 600;
  margin-bottom: 4px;
}
.timeline-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.timeline-company {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.timeline-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ===== 联系页 ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 48px;
  align-items: start;
}
.contact-info-card {
  padding: 36px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}
.contact-item:last-child { border-bottom: none; }
.contact-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(99,102,241,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-label { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 2px; }
.contact-value { font-size: 0.95rem; color: var(--text-primary); }
.social-links { display: flex; gap: 12px; margin-top: 24px; }
.social-link {
  width: 44px; height: 44px;
  border-radius: 10px;
  background: rgba(99,102,241,0.08);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}
.social-link:hover {
  background: var(--gradient);
  border-color: transparent;
  transform: translateY(-3px);
}
.contact-form-card { padding: 36px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  transition: var(--transition);
  outline: none;
  resize: vertical;
}
.form-control:focus {
  border-color: var(--accent-1);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-control::placeholder { color: var(--text-muted); }
textarea.form-control { min-height: 140px; }
.form-submit { width: 100%; justify-content: center; font-size: 1rem; }
.form-success {
  display: none;
  text-align: center;
  padding: 24px;
  color: #22c55e;
  font-weight: 600;
}

/* ===== Footer ===== */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-size: 1.2rem;
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer-text { color: var(--text-muted); font-size: 0.85rem; }
.footer-links { display: flex; gap: 24px; }
.footer-link {
  color: var(--text-muted);
  font-size: 0.85rem;
  transition: var(--transition);
}
.footer-link:hover { color: var(--text-primary); }

/* ===== 页面顶部背景 ===== */
.page-hero {
  padding: 140px 0 80px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% -20%, rgba(99,102,241,0.15) 0%, transparent 70%);
}
.page-hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  position: relative;
}
.page-hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 540px;
  margin: 0 auto;
  position: relative;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-stats.left { left: -20px; }
  .hero-stats.right { right: -20px; }
  .hero-avatar-wrap { width: 280px; height: 280px; }
  .hero-avatar-img { width: 280px; height: 280px; }
}
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; gap: 60px; }
  .hero-visual { order: -1; }
  .hero-stats.left, .hero-stats.right { display: none; }
  .about-hero-inner { grid-template-columns: 1fr; }
  .about-avatar { max-width: 300px; }
  .contact-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 72px 0; }
  .nav-links { display: none; position: fixed; top: var(--nav-height); left: 0; right: 0; background: var(--bg-secondary); border-bottom: 1px solid var(--border); flex-direction: column; padding: 20px; gap: 4px; }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .projects-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero-avatar-wrap { width: 220px; height: 220px; }
  .hero-avatar-img { width: 220px; height: 220px; }
  .hero-avatar-ring { inset: -14px; }
}