/* === DESIGN TOKENS === */
:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --color-bg: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text: #1A1A2E;
  --color-text-secondary: #4A4A6A;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;
  --color-border: #E5E7EB;
  --color-tag-bg: #EFF6FF;
  --color-tag-text: #1E40AF;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --max-width: 1100px;
  --spacing-section: 5rem;
}

/* === RESET === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-hover); }
ul { list-style: none; }

/* === LAYOUT === */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
.section { padding: var(--spacing-section) 0; }
.section + .section { border-top: 1px solid var(--color-border); }

/* === NAV === */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 0;
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-text);
}
.nav-links { display: flex; gap: 2rem; }
.nav-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-accent); }

/* === HERO === */
.hero {
  padding: 5rem 0 4rem;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 4rem;
  align-items: center;
}
.hero-text h1 {
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}
.hero-text .tagline {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 540px;
}
.hero-photo {
  width: 260px;
  height: 260px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-border);
  box-shadow: var(--shadow-lg);
}

/* === STATS === */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.stat-card .number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-accent);
  display: block;
}
.stat-card .label {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

/* === CARDS === */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.card .meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
}
.card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* === TAGS === */
.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.tag {
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
}

/* === SECTION HEADINGS === */
.section-header {
  margin-bottom: 2.5rem;
}
.section-header h2 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}
.section-header p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 600px;
}

/* === ABOUT BLOCKS === */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: start;
}
.about-content p { margin-bottom: 1.25rem; }
.about-content p:last-child { margin-bottom: 0; }
.about-sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
}
.about-sidebar h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}
.about-sidebar ul { display: flex; flex-direction: column; gap: 0.5rem; }
.about-sidebar li {
  font-size: 0.95rem;
  padding-left: 1rem;
  position: relative;
}
.about-sidebar li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* === PERSONAL === */
.personal-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}
.personal-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.personal-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.personal-card .content { padding: 1.5rem; }
.personal-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.5rem; }
.personal-card p { font-size: 0.9rem; color: var(--color-text-secondary); }

/* === CONTACT === */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 400px;
}
.contact-link {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 1.1rem;
  font-weight: 500;
}
.contact-link svg {
  width: 24px;
  height: 24px;
  color: var(--color-accent);
  flex-shrink: 0;
}

/* === FOOTER === */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}
.footer a { color: var(--color-text-secondary); }
.footer a:hover { color: var(--color-accent); }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }
  .hero-photo {
    width: 180px;
    height: 180px;
    margin: 0 auto;
    order: -1;
  }
  .hero-text .tagline { margin: 0 auto 2rem; }
  .stats { grid-template-columns: 1fr 1fr; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.85rem; }
  .about-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
  .hero-text h1 { font-size: 2rem; }
  .section { padding: 3rem 0; }
}
@media (max-width: 480px) {
  .stats { grid-template-columns: 1fr; }
  .nav-links { gap: 0.75rem; }
}