/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --text: #e8e8e8;
  --text-muted: #888;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --border: #2a2a2a;
  --radius: 12px;
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

.section { padding: 100px 0; }
.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

/* ===== Fade-in Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); }
.btn-secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-full { width: 100%; text-align: center; }

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo { font-size: 1.4rem; font-weight: 700; color: var(--accent); }
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: var(--transition);
  position: relative;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition);
}
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  transition: var(--transition);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}
.hero-greeting {
  display: inline-block;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 12px;
  font-weight: 500;
}
.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 32px;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Floating shapes */
.floating-shape {
  position: absolute;
  border-radius: 50%;
  opacity: 0.08;
  animation: float 6s ease-in-out infinite;
}
.shape-1 { width: 300px; height: 300px; background: var(--accent); top: 10%; right: 10%; animation-delay: 0s; }
.shape-2 { width: 200px; height: 200px; background: #f5576c; bottom: 15%; left: 8%; animation-delay: 2s; }
.shape-3 { width: 150px; height: 150px; background: #43e97b; top: 40%; left: 15%; animation-delay: 4s; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-30px) rotate(5deg); }
}

/* ===== About / Strengths ===== */
.strengths-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.strength-card {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.strength-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.strength-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.strength-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  color: var(--text);
}
.strength-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.about-stats {
  display: flex;
  justify-content: center;
  gap: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}
.stat { text-align: center; }
.stat-number { display: block; font-size: 2.5rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.9rem; color: var(--text-muted); margin-top: 4px; }

/* ===== Timeline ===== */
.timeline-container {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline-container::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}
.timeline-entry {
  position: relative;
  margin-bottom: 48px;
  padding-left: 40px;
}
.timeline-entry:last-child { margin-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -33px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  z-index: 1;
}
.timeline-content {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.timeline-content:hover {
  border-color: var(--accent);
}
.timeline-date {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--accent);
  background: rgba(99, 102, 241, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 12px;
  font-weight: 500;
}
.timeline-company {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.timeline-position {
  display: block;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.timeline-bullets {
  padding-left: 0;
}
.timeline-bullets li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.timeline-bullets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.6;
}
.timeline-bullets li strong {
  color: var(--text);
}

/* ===== Education ===== */
.education-section {
  margin-top: 80px;
  padding-top: 60px;
  border-top: 1px solid var(--border);
}
.education-title {
  font-size: 1.8rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
}
.education-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}
.education-card {
  background: var(--bg-card);
  padding: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}
.education-card h4 {
  font-size: 1.15rem;
  margin-bottom: 6px;
}
.education-detail {
  display: block;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 10px;
}
.education-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Skills ===== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
}
.skill-category {
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.skill-category:hover {
  border-color: var(--accent);
}
.skill-category-title {
  font-size: 1.2rem;
  margin-bottom: 20px;
  color: var(--accent);
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.skill-tag {
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  transition: var(--transition);
}
.skill-tag:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Contact ===== */
.contact-info {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}
.contact-info h3 { font-size: 1.5rem; margin-bottom: 12px; }
.contact-info > p { color: var(--text-muted); margin-bottom: 32px; }
.contact-details {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 32px;
  align-items: center;
}
.contact-item { display: flex; align-items: center; gap: 12px; color: var(--text-muted); font-size: 1rem; }
.contact-icon { font-size: 1.2rem; }
.social-links { display: flex; gap: 12px; justify-content: center; }
.social-link {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: var(--transition);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 260px;
    height: 100vh;
    background: var(--bg-card);
    flex-direction: column;
    padding: 80px 32px 32px;
    gap: 24px;
    transition: var(--transition);
    border-left: 1px solid var(--border);
  }
  .nav-links.open { right: 0; }

  .strengths-grid { grid-template-columns: 1fr; }
  .about-stats { gap: 32px; }

  .timeline-container { padding-left: 30px; }
  .timeline-container::before { left: 10px; }
  .timeline-entry { padding-left: 24px; }
  .timeline-dot { left: -28px; }

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

@media (max-width: 480px) {
  .section { padding: 60px 0; }
  .section-title { font-size: 2rem; }
  .hero-title { font-size: 2.5rem; }
  .hero-subtitle { font-size: 1rem; }
  .about-stats { gap: 20px; flex-wrap: wrap; }
  .stat-number { font-size: 2rem; }

  .timeline-content { padding: 20px; }
  .timeline-company { font-size: 1.1rem; }
}