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

:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface2: #1a1a2e;
  --surface3: #16213e;
  --text: #e4e4e7;
  --text2: #a1a1aa;
  --accent: #0ea5e9;
  --accent2: #38bdf8;
  --border: #27272a;
  --radius: 12px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

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

.logo {
  font-size: 24px;
  font-weight: 800;
  color: var(--accent);
  font-family: monospace;
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text2);
  font-size: 13px;
  font-weight: 500;
  transition: color var(--transition);
}

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

.lang-switch {
  display: flex;
  gap: 4px;
}

.lang-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  transition: all var(--transition);
}

.lang-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.lang-btn:not(.active):hover {
  border-color: var(--accent);
  color: var(--text);
}

/* Hero */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 64px;
}

.hero-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}

.hero-text h1 {
  font-size: 44px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.wave {
  display: inline-block;
  animation: wave 2s infinite;
}

@keyframes wave {
  0%, 100% { transform: rotate(0); }
  25% { transform: rotate(15deg); }
  75% { transform: rotate(-10deg); }
}

.highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 18px;
  color: var(--accent2);
  font-weight: 600;
  margin-bottom: 8px;
}

.description {
  font-size: 15px;
  color: var(--text2);
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
}

.btn {
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition);
}

.btn-primary {
  background: var(--accent);
  color: white;
}

.btn-primary:hover {
  background: var(--accent2);
  transform: translateY(-2px);
}

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

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

.hero-avatar {
  flex-shrink: 0;
}

.avatar-img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 0 60px rgba(14, 165, 233, 0.25);
}

/* Sections */
section {
  padding: 100px 0;
}

.section-title {
  font-size: 30px;
  font-weight: 700;
  margin-bottom: 40px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60px;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
}

/* About */
#about {
  background: var(--surface);
}

.about-content p {
  color: var(--text2);
  font-size: 16px;
  margin-bottom: 24px;
  max-width: 700px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--text2);
  font-size: 14px;
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: 32px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  margin-bottom: 36px;
}

.timeline-dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}

.timeline-content {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition);
}

.timeline-content:hover {
  border-color: var(--accent);
}

.timeline-date {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.timeline-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 4px;
}

.timeline-sub {
  color: var(--accent2);
  font-size: 14px;
  margin-bottom: 12px;
}

.timeline-content ul {
  list-style: none;
  padding: 0;
}

.timeline-content ul li {
  color: var(--text2);
  font-size: 14px;
  padding-left: 20px;
  position: relative;
  margin-bottom: 6px;
}

.timeline-content ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

/* Skills */
#skills {
  background: var(--surface);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: all var(--transition);
}

.skill-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.skill-icon {
  font-size: 28px;
  display: block;
  margin-bottom: 12px;
}

.skill-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.skill-card p {
  color: var(--text2);
  font-size: 13px;
}

/* Education */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.edu-card {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: all var(--transition);
}

.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.edu-icon {
  font-size: 36px;
  margin-bottom: 12px;
}

.edu-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.edu-card p {
  color: var(--text2);
  font-size: 13px;
}

/* Contact */
#contact {
  background: var(--surface);
  text-align: center;
}

#contact .section-title::after {
  left: 50%;
  transform: translateX(-50%);
}

.contact-sub {
  color: var(--text2);
  margin-bottom: 32px;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.social-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text2);
  transition: all var(--transition);
}

.social-btn:hover {
  color: white;
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-3px);
}

.contact-details p {
  color: var(--text2);
  font-size: 14px;
  margin-bottom: 4px;
}

/* Footer */
footer {
  text-align: center;
  padding: 28px 0;
  border-top: 1px solid var(--border);
  color: var(--text2);
  font-size: 13px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
  }

  .hero-text h1 {
    font-size: 28px;
  }

  .description {
    max-width: 100%;
  }

  .hero-buttons {
    justify-content: center;
  }

  .nav-links {
    display: none;
  }

  .section-title::after {
    left: 50% !important;
    transform: translateX(-50%);
  }

  #about {
    text-align: center;
  }

  .about-content p {
    max-width: 100%;
  }

  .contact-info {
    align-items: center;
  }

  .timeline {
    padding-left: 28px;
  }

  .timeline-dot {
    left: -24px;
  }
}