/* ============================================================
   CSS Custom Properties — Both Themes
   ============================================================ */
:root {
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

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

  --transition: 0.25s ease;
  --transition-slow: 0.5s ease;

  --max-width: 1100px;
  --nav-height: 70px;
}

[data-theme="dark"] {
  --ink-black:        #001514ff;
  --coffee-bean:      #1b1110ff;
  --rich-mahogany:    #290f0eff;
  --rich-mahogany-2:  #360d0cff;
  --rich-mahogany-3:  #440b0aff;
  --rich-mahogany-4:  #4b0a09ff;
  --black-cherry:     #510908ff;
  --black-cherry-2:   #5e0706ff;
  --dark-garnet:      #650605ff;
  --dark-garnet-2:    #6b0504ff;

  --bg:          var(--ink-black);
  --bg-alt:      var(--coffee-bean);
  --bg-card:     var(--rich-mahogany);
  --bg-card-hover: var(--rich-mahogany-2);
  --border:      var(--rich-mahogany-3);
  --accent:      #c0392b;
  --accent-glow: rgba(192, 57, 43, 0.25);
  --accent-soft: rgba(192, 57, 43, 0.12);
  --text-primary:   #f5eeec;
  --text-secondary: #c8aba7;
  --text-muted:     #8a6560;
  --nav-bg:         rgba(0, 21, 20, 0.85);
  --tag-bg:         var(--rich-mahogany-3);
  --tag-text:       #e8c5c1;
  --pill-bg:        var(--black-cherry);
  --pill-text:      #f0d0cc;
  --stat-bg:        var(--rich-mahogany-2);
  --dot-color:      var(--dark-garnet-2);
  --dot-ring:       var(--rich-mahogany-4);
  --timeline-line:  var(--rich-mahogany-3);
  --hero-glow:      rgba(107, 5, 4, 0.4);
}

[data-theme="light"] {
  --deep-space-blue:  #012a4aff;
  --yale-blue:        #013a63ff;
  --yale-blue-2:      #01497cff;
  --yale-blue-3:      #014f86ff;
  --rich-cerulean:    #2a6f97ff;
  --cerulean:         #2c7da0ff;
  --air-force-blue:   #468fafff;
  --steel-blue:       #61a5c2ff;
  --sky-blue-light:   #89c2d9ff;
  --light-blue:       #a9d6e5ff;

  --bg:          #f0f8ff;
  --bg-alt:      #e4f3fb;
  --bg-card:     #ffffff;
  --bg-card-hover: #f5fbff;
  --border:      var(--sky-blue-light);
  --accent:      var(--cerulean);
  --accent-glow: rgba(44, 125, 160, 0.2);
  --accent-soft: rgba(44, 125, 160, 0.1);
  --text-primary:   var(--deep-space-blue);
  --text-secondary: var(--yale-blue-2);
  --text-muted:     var(--rich-cerulean);
  --nav-bg:         rgba(240, 248, 255, 0.9);
  --tag-bg:         var(--sky-blue-light);
  --tag-text:       var(--deep-space-blue);
  --pill-bg:        var(--light-blue);
  --pill-text:      var(--deep-space-blue);
  --stat-bg:        var(--light-blue);
  --dot-color:      var(--cerulean);
  --dot-ring:       var(--sky-blue-light);
  --timeline-line:  var(--sky-blue-light);
  --hero-glow:      rgba(1, 73, 124, 0.25);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
strong { font-weight: 600; color: var(--text-primary); }
img { display: block; max-width: 100%; }

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), border-color var(--transition-slow);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--accent);
  letter-spacing: 0.05em;
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 0.75; }

.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav-links a:hover { color: var(--text-primary); }
.nav-links a:hover::after { width: 100%; }

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 6px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background var(--transition), border-color var(--transition);
}
.theme-toggle:hover { background: var(--bg-card-hover); }

.theme-icon {
  font-size: 1rem;
  line-height: 1;
  transition: opacity var(--transition), transform var(--transition);
}
[data-theme="dark"] .sun  { opacity: 0.3; }
[data-theme="dark"] .moon { opacity: 1;   transform: scale(1.1); }
[data-theme="light"] .sun  { opacity: 1;   transform: scale(1.1); }
[data-theme="light"] .moon { opacity: 0.3; }
[data-theme="dark"] .theme-toggle { border-color: rgba(245, 238, 236, 0.25); }
[data-theme="dark"] .theme-icon { color: #f5eeec; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px; height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-hamburger span {
  display: block;
  width: 100%; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--border);
  gap: 12px;
}
.nav-mobile.open { display: flex; }
.mobile-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition);
}
.mobile-link:hover { color: var(--accent); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 60%, var(--hero-glow), transparent);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  max-width: 720px;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.8s 0.1s ease forwards;
}

.hero-name {
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.8s 0.25s ease forwards;
}

.hero-name-accent { color: var(--accent); }

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  color: var(--text-secondary);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.8s 0.4s ease forwards;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto 36px;
  opacity: 0;
  animation: fadeUp 0.8s 0.55s ease forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.8s 0.7s ease forwards;
}

.btn {
  display: inline-flex;
  align-items: center;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 8px 30px var(--accent-glow); }

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

.hero-scroll {
  margin-top: 56px;
  display: flex;
  justify-content: center;
  opacity: 0;
  animation: fadeUp 0.8s 0.9s ease forwards;
}
.hero-scroll span {
  display: block;
  width: 24px; height: 40px;
  border: 2px solid var(--border);
  border-radius: 12px;
  position: relative;
}
.hero-scroll span::after {
  content: '';
  position: absolute;
  top: 6px; left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollPulse 1.8s infinite;
}

/* ============================================================
   Sections
   ============================================================ */
.section {
  padding: 100px 0;
}
.section-alt {
  background: var(--bg-alt);
  transition: background var(--transition-slow);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  margin-bottom: 64px;
}
.section-tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ============================================================
   About
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 64px;
  align-items: start;
  max-width: 720px;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 18px;
  font-size: 1.025rem;
}

.about-meta {
  margin-top: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.about-meta-item {
  display: flex;
  align-items: center;
  gap: 16px;
}
.meta-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  min-width: 80px;
}
.meta-value {
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.meta-available {
  color: #27ae60;
  font-weight: 500;
}
[data-theme="dark"] .meta-available { color: #2ecc71; }

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat-card {
  background: var(--stat-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 24px;
  text-align: center;
  transition: background var(--transition-slow), transform var(--transition);
}
.stat-card:hover { transform: translateY(-4px); }

.stat-number {
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================================
   Timeline / Experience
   ============================================================ */
.timeline {
  position: relative;
  padding-left: 32px;
}
.timeline::before {
  content: '';
  position: absolute;
  top: 0; bottom: 0;
  left: 8px;
  width: 2px;
  background: var(--timeline-line);
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  margin-bottom: 56px;
}
.timeline-item:last-child { margin-bottom: 0; }

.timeline-dot {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: var(--dot-color);
  border: 3px solid var(--dot-ring);
  box-shadow: 0 0 0 4px var(--accent-soft);
  transition: transform var(--transition);
}
.timeline-item:hover .timeline-dot { transform: scale(1.25); }

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  transition: background var(--transition-slow), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.timeline-content:hover {
  border-color: var(--accent);
  transform: translateX(4px);
  box-shadow: 0 4px 24px var(--accent-glow);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}
.timeline-role {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}
.timeline-company {
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
  margin-top: 2px;
}
.timeline-period {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  padding-top: 4px;
}
.timeline-promo {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 14px;
  padding: 8px 12px;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  border-radius: 0 4px 4px 0;
}

.timeline-bullets {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.timeline-bullets li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 16px;
  position: relative;
}
.timeline-bullets li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.75rem;
  top: 2px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.timeline-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 500;
  transition: background var(--transition-slow);
}

/* ============================================================
   Skills
   ============================================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.skill-group {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: background var(--transition-slow), border-color var(--transition), transform var(--transition);
}
.skill-group:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.skill-group-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.skill-icon {
  color: var(--accent);
  font-size: 0.75rem;
}

.skill-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-pills span {
  font-size: 0.82rem;
  background: var(--pill-bg);
  color: var(--pill-text);
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 500;
  transition: background var(--transition-slow), transform var(--transition);
}
.skill-pills span:hover { transform: scale(1.05); }

/* ============================================================
   Education
   ============================================================ */
.edu-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: background var(--transition-slow), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.edu-card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.edu-icon {
  font-size: 2rem;
  flex-shrink: 0;
  width: 56px; height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
}

.edu-degree {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.edu-school {
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 4px;
}
.edu-period {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.edu-result {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* ============================================================
   Contact
   ============================================================ */
.contact-wrapper {
  max-width: 700px;
}
.contact-intro {
  font-size: 1.075rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  transition: background var(--transition-slow), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.contact-card:not(.no-link):hover {
  border-color: var(--accent);
  transform: translateX(6px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.contact-card-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  width: 48px; height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  border-radius: var(--radius-sm);
}
.contact-card-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: block;
}
.contact-card-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
  display: block;
  margin-top: 2px;
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ============================================================
   Reveal Animation
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Keyframes
   ============================================================ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes scrollPulse {
  0%   { transform: translate(-50%, 0); opacity: 1; }
  80%  { transform: translate(-50%, 12px); opacity: 0; }
  100% { transform: translate(-50%, 0); opacity: 0; }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }

  .contact-card {
    gap: 12px;
    padding: 14px 16px;
  }
  .contact-card-icon {
    width: 36px; height: 36px;
    font-size: 1.1rem;
  }
  .contact-card-label {
    font-size: 0.65rem;
  }
  .contact-card-value {
    font-size: 0.78rem;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .timeline {
    padding-left: 24px;
  }
  .timeline-content {
    padding: 20px;
  }
  .timeline-header {
    flex-direction: column;
    gap: 4px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .section { padding: 72px 0; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .edu-card { flex-direction: column; }
}