/* ============================================
   CSS Custom Properties & Theming
   ============================================ */
:root {
  /* Dark theme (default) */
  --bg: #060d1a;
  --bg-alt: #0b1526;
  --surface: #0f1e33;
  --surface-hover: #152540;
  --border: #1c2f4a;
  --border-subtle: #142038;

  --accent-blue: #38bdf8;
  --accent-blue-dim: rgba(56, 189, 248, 0.12);
  --accent-blue-glow: rgba(56, 189, 248, 0.25);
  --accent-green: #34d399;
  --accent-green-dim: rgba(52, 211, 153, 0.12);
  --accent-green-glow: rgba(52, 211, 153, 0.2);

  --text-primary: #e2e8f0;
  --text-secondary: #7f9bb5;
  --text-muted: #3d5a78;

  --nav-bg: rgba(6, 13, 26, 0.85);
  --glow-blue: rgba(56, 189, 248, 0.15);
  --glow-green: rgba(52, 211, 153, 0.1);

  --radius: 12px;
  --radius-sm: 6px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg: #f0f7ff;
  --bg-alt: #e8f3fd;
  --surface: #ffffff;
  --surface-hover: #f0f7ff;
  --border: #c8dfef;
  --border-subtle: #daeaf8;

  --accent-blue: #0369a1;
  --accent-blue-dim: rgba(3, 105, 161, 0.08);
  --accent-blue-glow: rgba(3, 105, 161, 0.2);
  --accent-green: #047857;
  --accent-green-dim: rgba(4, 120, 87, 0.08);
  --accent-green-glow: rgba(4, 120, 87, 0.15);

  --text-primary: #0c1a2e;
  --text-secondary: #3d6080;
  --text-muted: #7fa8c7;

  --nav-bg: rgba(240, 247, 255, 0.9);
  --glow-blue: rgba(3, 105, 161, 0.08);
  --glow-green: rgba(4, 120, 87, 0.06);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img { max-width: 100%; }

/* ============================================
   Scroll Progress
   ============================================ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  width: 0%;
  z-index: 1000;
  transition: width 0.1s linear;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0 2rem;
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.4s ease;
}

.nav.scrolled {
  border-bottom-color: var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-glow);
  padding: 0.35rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), border-color var(--transition);
}

.nav-logo:hover {
  background: var(--accent-blue-dim);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
  background: var(--surface);
}

.nav-link--cta {
  color: var(--accent-blue);
  border: 1px solid var(--border);
  margin-left: 0.5rem;
}

.nav-link--cta:hover {
  background: var(--accent-blue-dim);
  border-color: var(--accent-blue-glow);
  color: var(--accent-blue);
}

/* Theme Toggle */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--surface-hover);
}

.theme-toggle__icon { display: flex; align-items: center; justify-content: center; }
[data-theme="dark"] .theme-toggle__icon--moon { display: none; }
[data-theme="light"] .theme-toggle__icon--sun { display: none; }

/* ============================================
   Layout Utilities
   ============================================ */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 7rem 0;
}

.section--alt {
  background: var(--bg-alt);
}

.section-header {
  margin-bottom: 4rem;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-green);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding-top: 64px;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  animation: glowPulse 8s ease-in-out infinite alternate;
}

.hero-glow--blue {
  width: 600px;
  height: 600px;
  background: var(--glow-blue);
  top: -100px;
  right: -100px;
}

.hero-glow--green {
  width: 500px;
  height: 500px;
  background: var(--glow-green);
  bottom: 0;
  left: -150px;
  animation-delay: -4s;
}

@keyframes glowPulse {
  from { opacity: 0.5; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.15); }
}

.hero .container {
  position: relative;
  z-index: 1;
  padding-top: 4rem;
  padding-bottom: 6rem;
}

.hero-content {
  max-width: 700px;
}

.hero-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.hero-name {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.hero-name em {
  font-style: italic;
  color: var(--accent-blue);
}

.hero-tagline {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn--primary:hover {
  opacity: 0.88;
  transform: translateY(-1px);
  box-shadow: 0 8px 25px var(--accent-blue-glow);
}

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

.btn--ghost:hover {
  border-color: var(--text-muted);
  color: var(--text-primary);
  background: var(--surface);
}

.hero-scroll-cue {
  position: absolute;
  bottom: 3rem;
  left: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-family: 'JetBrains Mono', monospace;
}

.hero-scroll-line {
  width: 60px;
  height: 1px;
  background: var(--text-muted);
  transform-origin: left;
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0%, 100% { transform: scaleX(1); opacity: 0.4; }
  50%       { transform: scaleX(0.5); opacity: 1; }
}

/* ============================================
   Reveal Animations (Hero)
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  animation: revealUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.reveal--delay-1 { animation-delay: 0.15s; }
.reveal--delay-2 { animation-delay: 0.3s; }
.reveal--delay-3 { animation-delay: 0.45s; }
.reveal--delay-4 { animation-delay: 0.6s; }

@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Scroll Fade-up Animations
   ============================================ */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-up.fade-up--delay  { transition-delay: 0.15s; }
.fade-up.fade-up--delay-2 { transition-delay: 0.3s; }

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   About
   ============================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 4rem;
  align-items: start;
}

.about-lead {
  font-family: 'Fraunces', Georgia, serif;
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1.55;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.about-text p {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about-text p:last-child { margin-bottom: 0; }

.about-sidebar {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.skills-block {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.skills-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-family: 'JetBrains Mono', monospace;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skill-tag {
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-glow);
  font-weight: 500;
  white-space: nowrap;
}

.skill-tag--accent {
  background: var(--accent-green-dim);
  color: var(--accent-green);
  border-color: var(--accent-green-glow);
}

/* ============================================
   Experience / Timeline
   ============================================ */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--accent-blue), var(--accent-green), transparent);
  opacity: 0.4;
}

.timeline-item {
  position: relative;
  padding-bottom: 3.5rem;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-marker {
  position: absolute;
  left: -2.4rem;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent-blue);
  border: 2px solid var(--bg-alt);
  box-shadow: 0 0 10px var(--accent-blue-glow);
}

.timeline-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color var(--transition), transform var(--transition);
}

.timeline-content:hover {
  border-color: var(--accent-blue-glow);
  transform: translateX(4px);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.timeline-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.timeline-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  background: var(--accent-green-dim);
  color: var(--accent-green);
  border: 1px solid var(--accent-green-glow);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.timeline-role {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.timeline-company {
  font-size: 0.875rem;
  color: var(--accent-blue);
  margin-bottom: 1rem;
  font-weight: 500;
}

.timeline-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: 1.25rem;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.timeline-tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  background: var(--bg-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

/* ============================================
   Personal Projects
   ============================================ */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: var(--accent-blue-glow);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.project-card__icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--accent-blue-dim);
  border: 1px solid var(--accent-blue-glow);
  color: var(--accent-blue);
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__links {
  display: flex;
  gap: 0.5rem;
}

.project-link {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.project-link:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  background: var(--surface-hover);
}

.project-card__title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.project-card__desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.7;
  flex: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: auto;
  padding-top: 0.5rem;
}

.project-tag {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  background: var(--accent-blue-dim);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-glow);
}

/* ============================================
   Contact
   ============================================ */
.contact {
  background: var(--bg-alt);
}

.contact-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
  padding-bottom: 5rem;
}

.contact-inner .section-label {
  margin-bottom: 1rem;
}

.contact-title {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  line-height: 1.1;
}

.contact-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.contact-links {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.8rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  border: 1px solid transparent;
}

.contact-btn {
  background: var(--accent-blue);
  color: var(--bg);
}

.contact-btn:hover {
  opacity: 0.88;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px var(--accent-blue-glow);
}

.contact-btn--secondary {
  background: var(--surface);
  color: var(--text-primary);
  border-color: var(--border);
}

.contact-btn--secondary:hover {
  border-color: var(--text-muted);
  background: var(--surface-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.03em;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 900px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .hero-name {
    font-size: clamp(3.5rem, 14vw, 5rem);
  }

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

  .section {
    padding: 4.5rem 0;
  }

  .hero-scroll-cue {
    display: none;
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }
}