/* Modern personal site styles */
:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --text: #1f2937;
  --text-muted: #6b7280;
  --bg: #ffffff;
  --border: #e5e7eb;
  --surface: #f9fafb;
  --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius: 0.5rem;
  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f9fafb;
    --text-muted: #9ca3af;
    --bg: #111827;
    --border: #374151;
    --surface: #1f2937;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 1rem 0;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin: 0 0 1rem 0;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

.section {
  padding: 4rem 0;
}

.section-sm {
  padding: 2rem 0;
}

/* Hero section */
.hero {
  text-align: center;
  padding: 6rem 0;
  background: linear-gradient(135deg, var(--surface) 0%, var(--bg) 100%);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, #7c3aed 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-group {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background: var(--primary-hover);
  color: white;
  text-decoration: none;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-secondary:hover {
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: all 0.2s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  color: var(--primary);
}

/* Grid layouts */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Experience/Projects lists */
.timeline {
  position: relative;
}

.timeline-item {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 0.75rem;
  height: 0.75rem;
  background: var(--primary);
  border-radius: 50%;
}

.timeline-item::after {
  content: '';
  position: absolute;
  left: 0.375rem;
  top: 1.25rem;
  width: 2px;
  height: calc(100% + 1rem);
  background: var(--border);
}

.timeline-item:last-child::after {
  display: none;
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.timeline-title {
  font-weight: 600;
  color: var(--text);
}

.timeline-meta {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.timeline-bullets {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0 0;
}

.timeline-bullets li {
  position: relative;
  padding-left: 1rem;
  margin-bottom: 0.25rem;
}

.timeline-bullets li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Header */
.header-wrapper {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
}

.site-title:hover {
  color: var(--primary);
  text-decoration: none;
}

.menu {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu-item a {
  color: var(--text);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s;
}

.menu-item a:hover {
  color: var(--primary);
  text-decoration: none;
}

/* Footer */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
}

.footer-row {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.footer-item {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.875rem;
}

.footer-item:hover {
  color: var(--primary);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1.125rem;
  }
  
  .cta-group {
    flex-direction: column;
    align-items: center;
  }
  
  .header {
    flex-direction: column;
    gap: 1rem;
  }
  
  .menu {
    gap: 1rem;
  }
  
  .timeline-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeInUp 0.6s ease-out;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }