:root {
  --color-dark-blue: #111111;
  --color-navy: #111111;
  --color-blue: #2563eb;
  --color-light-blue: #3b82f6;
  --color-white: #ffffff;
  --color-off-white: #f5f5f5;
  --color-black: #111111;
  --color-gray: #555555;
  --color-light-gray: #e0e0e0;
  
  --font-display: 'Space Mono', 'Courier New', monospace;
  --font-body: 'Space Mono', 'Courier New', monospace;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-blue: 0 4px 20px rgba(37, 99, 235, 0.15);
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Space Mono', 'Courier New', monospace;
  background-color: var(--color-white);
  color: var(--color-black);
  line-height: 1.6;
  overflow-x: hidden;
}

body, body * {
  font-family: 'Space Mono', 'Courier New', monospace;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.025em;
  color: var(--color-dark-blue);
}

h1 {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

p {
  color: var(--color-gray);
  font-size: 1.1rem;
}

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

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-light-gray);
  z-index: 1000;
  padding: 1rem 0;
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-dark-blue);
  letter-spacing: -0.05em;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--color-gray);
  font-weight: 500;
  position: relative;
  text-transform: lowercase;
  letter-spacing: 0.05em;
  font-size: 0.85rem;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-blue);
  transition: width 0.3s ease;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-dark-blue);
}

.social-links {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  position: absolute;
  right: 2rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-dark-blue);
  transition: color 0.2s;
  padding: 4px;
}

.social-links a:hover {
  color: var(--color-blue);
  transform: none;
  box-shadow: none;
  background: none;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0.5rem;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--color-dark-blue);
  transition: var(--transition);
}

.main-content {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.section {
  margin-bottom: 6rem;
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--color-blue);
  margin: 1rem auto 0;
}

.hero {
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--color-off-white) 0%, var(--color-white) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    linear-gradient(90deg, var(--color-light-gray) 1px, transparent 1px),
    linear-gradient(0deg, var(--color-light-gray) 1px, transparent 1px);
  background-size: 50px 50px;
  opacity: 0.3;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
}

.hero-tag {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: var(--color-dark-blue);
  color: var(--color-white);
  border-radius: 50px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  animation: fadeInUp 0.6s ease;
}

.hero h1 {
  font-size: 4.5rem;
  margin-bottom: 1.5rem;
  animation: fadeInUp 0.6s ease 0.1s backwards;
}

.hero h1 span {
  color: var(--color-blue);
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--color-gray);
  margin-bottom: 3rem;
  font-family: var(--font-body);
  font-weight: 400;
  animation: fadeInUp 0.6s ease 0.2s backwards;
}

.hero-buttons {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  animation: fadeInUp 0.6s ease 0.3s backwards;
}

.btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  font-weight: 600;
  border-radius: 8px;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-display);
}

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

.btn-primary:hover {
  background: var(--color-blue);
  border-color: var(--color-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
}

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

.btn-secondary:hover {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--color-white);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  border: 1px solid var(--color-light-gray);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--color-blue), var(--color-navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-blue);
  border-color: var(--color-blue);
}

.project-row .card { border-color: var(--color-blue); }

.card:hover::before {
  transform: scaleX(1);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  background: var(--color-light-gray);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-icon {
  width: 50px;
  height: 50px;
  background: var(--color-dark-blue);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 1.5rem;
  flex-shrink: 0;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-gray);
  font-family: var(--font-display);
  text-align: right;
}

.card h3 {
  color: var(--color-dark-blue);
  margin-bottom: 0.5rem;
  font-size: 1.4rem;
}

.card-subtitle {
  color: var(--color-blue);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 1rem;
  font-family: var(--font-display);
}

.card p {
  font-size: 1rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.card ul {
  list-style: none;
  margin-bottom: 1.5rem;
}

.card ul li {
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  position: relative;
  color: var(--color-gray);
  font-size: 0.95rem;
}

.card ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--color-blue);
  font-weight: bold;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.tech-tag {
  padding: 0.4rem 1rem;
  background: var(--color-off-white);
  color: var(--color-dark-blue);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  border: 1px solid var(--color-light-gray);
  font-family: var(--font-display);
  transition: var(--transition);
}

.tech-tag:hover {
  background: var(--color-dark-blue);
  color: var(--color-white);
  border-color: var(--color-dark-blue);
}

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

.skill-category {
  background: var(--color-white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--color-blue);
}

.skill-category h3 {
  margin-bottom: 1.5rem;
  color: var(--color-dark-blue);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-category h3::before {
  content: '//';
  color: var(--color-blue);
  font-family: var(--font-display);
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-item {
  padding: 0.6rem 1.2rem;
  background: var(--color-off-white);
  border-radius: 8px;
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-dark-blue);
  border: 1px solid var(--color-light-gray);
  transition: var(--transition);
}

.skill-item:hover {
  background: var(--color-dark-blue);
  color: var(--color-white);
  transform: translateY(-2px);
}

.contact-form {
  max-width: 700px;
  margin: 0 auto;
  background: var(--color-white);
  padding: 3rem;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-light-gray);
}

.form-group {
  margin-bottom: 2rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--color-dark-blue);
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  border: 2px solid var(--color-light-gray);
  border-radius: 8px;
  font-family: var(--font-body);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--color-off-white);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-blue);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 150px;
}

.contact-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 4rem;
}

.contact-card {
  background: var(--color-white);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  text-align: center;
  border: 1px solid var(--color-light-gray);
  transition: var(--transition);
}

.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-blue);
}

.contact-icon {
  width: 60px;
  height: 60px;
  background: var(--color-dark-blue);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 1.5rem;
}

.contact-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.contact-card p {
  font-size: 0.95rem;
}

.contact-card a {
  color: var(--color-blue);
  word-break: break-all;
}

.contact-card a:hover {
  text-decoration: underline;
}

.footer {
  background: var(--color-dark-blue);
  color: var(--color-white);
  padding: 3rem 0 2rem;
  margin-top: 6rem;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
  text-align: center;
}

.footer p {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--color-white);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

@media (max-width: 768px) {
  .nav-links,
  .social-links {
    display: none;
  }
  
  .nav-links.active {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    gap: 1rem;
  }
  
  .menu-toggle {
    display: flex;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  .hero h1 {
    font-size: 3rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    gap: 1rem;
  }
  
  .cards-grid,
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .container {
    padding: 2rem 1rem;
  }
  
  .contact-form {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
  }
}

@media print {
  .navbar,
  .footer,
  .hero-buttons {
    display: none;
  }

  .main-content {
    margin-top: 0;
  }
}

/* ── Theme Toggle Button ─────────────────────── */
#theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px 6px;
  display: flex;
  align-items: center;
  font-size: 1rem;
  font-family: inherit;
  color: inherit;
  line-height: 1;
  transition: opacity 0.2s;
}
#theme-toggle:hover { opacity: 0.7; }
#theme-icon { filter: brightness(0); }
body.dark-mode #theme-icon { filter: brightness(0) invert(1); }

/* ── Accent Color Swatches ───────────────────── */
.accent-swatch {
  -webkit-appearance: none; appearance: none;
  width: 26px; height: 26px; border-radius: 50%;
  border: 3px solid transparent; cursor: pointer;
  transition: transform 0.15s, border-color 0.15s, box-shadow 0.15s;
  outline: none; padding: 0; display: inline-block; flex-shrink: 0;
}
.accent-swatch:hover { transform: scale(1.2); }
.accent-swatch.active {
  border-color: #111 !important;
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px #111;
}
body.dark-mode .accent-swatch.active {
  border-color: #fff !important;
  box-shadow: 0 0 0 2px #0d0d0d, 0 0 0 4px #fff;
}

/* ── Resume Link ─────────────────────────────── */
.social-links .resume-link {
  width: auto;
  height: auto;
  border-radius: 4px;
  background: transparent;
  border: 1px solid currentColor;
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  white-space: nowrap;
  padding: 3px 8px;
  text-decoration: none;
  color: inherit;
  transition: color 0.2s;
}
.social-links .resume-link:hover {
  color: var(--color-blue);
  background: none;
  transform: none;
  box-shadow: none;
}

/* ── Dark Mode ──────────────────────────────── */
body.dark-mode {
  background: #0d0d0d;
  color: #f0f0f0;
}
body.dark-mode .navbar {
  background: rgba(10, 10, 10, 0.75);
  border-bottom-color: #2a2a2a;
}
body.dark-mode .gh-chart-wrap {
  border-color: #2e2e2e !important;
}
body.dark-mode .nav-links a {
  color: #d0d0d0;
}
body.dark-mode .nav-links a.active {
  color: #ffffff;
}
body.dark-mode .social-links a {
  color: #d0d0d0;
}
body.dark-mode .social-links a:hover {
  color: var(--color-blue);
  background: none;
}
body.dark-mode .nav-links.active {
  background: rgba(10, 10, 10, 0.98);
}
body.dark-mode .hero {
  background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
}
body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
  color: #f0f0f0;
}

.project-section-heading {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 1.25rem 0 0.6rem;
  font-family: var(--font-display);
  letter-spacing: 0.02em;
}
body.dark-mode .section {
  background: #0d0d0d;
}
body.dark-mode .card {
  background: #1a1a1a;
  border-color: #2e2e2e;
}
body.dark-mode .card h3 {
  color: #f0f0f0;
}
body.dark-mode .btn-primary {
  background: #f0f0f0;
  color: #0d0d0d;
  border-color: #f0f0f0;
}
body.dark-mode .btn-primary:hover {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: #ffffff;
}
body.dark-mode .btn-secondary {
  color: #f0f0f0;
  border-color: #f0f0f0;
}
body.dark-mode .btn-secondary:hover {
  background: var(--color-blue);
  border-color: var(--color-blue);
  color: #ffffff;
}
body.dark-mode .skill-category {
  background: #1a1a1a;
}
body.dark-mode .skill-item {
  background: #0d0d0d;
  border-color: #2e2e2e;
  color: #f0f0f0;
}
body.dark-mode .tech-tag {
  background: #0d0d0d;
  border-color: #2e2e2e;
  color: #f0f0f0;
}
body.dark-mode .contact-form {
  background: #1a1a1a;
  border-color: #2e2e2e;
}
body.dark-mode .form-group input,
body.dark-mode .form-group textarea {
  background: #0d0d0d;
  border-color: #2e2e2e;
  color: #f0f0f0;
}
body.dark-mode .contact-card {
  background: #1a1a1a;
  border-color: #2e2e2e;
}
body.dark-mode .footer {
  background: #050505;
}
body.dark-mode .menu-toggle span {
  background: #f0f0f0;
}
/* index.html tab-bar segmented control */
body.dark-mode .tab-bar { background: #2a2a2a; }
body.dark-mode .tab-btn { color: #888; }
body.dark-mode .tab-btn.active { background: var(--color-blue); color: #fff; }
body.dark-mode .tab-btn:hover:not(.active) { color: var(--color-blue); }

/* index.html slider / entry specific */
body.dark-mode .slider-card {
  background: #1a1a1a;
  border-color: #2e2e2e;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4);
}
body.dark-mode .entry-divider { border-bottom-color: #2e2e2e; }
body.dark-mode .logo-box { background: #0d0d0d !important; border-color: #2e2e2e !important; }
body.dark-mode .entry-meta { color: #888888 !important; }
body.dark-mode .entry-sub  { color: #aaaaaa !important; }
body.dark-mode .entry-bullets { color: #aaaaaa; }
body.dark-mode .courses-summary { color: #888; }
body.dark-mode .courses-summary:hover { color: var(--color-blue); }
body.dark-mode .courses-col span { color: #888; }
body.dark-mode .divider { border-color: #2e2e2e; }
body.dark-mode .info-left p { color: #aaaaaa; }
body.dark-mode .skill-card { background: #1a1a1a; border-color: #2e2e2e; color: #f0f0f0; }
body.dark-mode .skill-card .skill-label { color: #888888; }
body.dark-mode .profile-socials a { color: #aaaaaa; }
body.dark-mode .profile-socials a:hover { color: var(--color-blue); }
body.dark-mode .photo-carousel { border-color: #2e2e2e; }
body.dark-mode .carousel-dot { background: #444; }
body.dark-mode .carousel-dot.active { background: var(--color-blue); }