:root {
  --color-background: #f8f9fa;
  --color-surface: #edeff1;
  --color-surface-raised: #f2f3f7;
  --color-primary: #399ee6;
  --color-primary-dark: #2f89c7;
  --color-secondary: #f07171;
  --color-highlight: #a37acc;
  --color-highlight-soft: rgba(163, 122, 204, 0.14);
  --color-highlight-soft-border: rgba(163, 122, 204, 0.32);
  --color-text: #404447;
  --color-muted: #8a9199;
  --color-border: #a0a6ac;
  --color-primary-soft: rgba(57, 158, 230, 0.14);
  --color-primary-soft-border: rgba(57, 158, 230, 0.32);
  --color-project-card: rgba(248, 249, 250, 0.92);
  --max-width: 1100px;
  font-size: 16px;
}

body.dark-theme {
  --color-background: #000000;
  --color-surface: #121212;
  --color-surface-raised: #222222;
  --color-primary: #5f8787;
  --color-primary-dark: #444444;
  --color-secondary: #dd9999;
  --color-highlight: #5f8787;
  --color-highlight-soft: rgba(95, 135, 135, 0.15);
  --color-highlight-soft-border: rgba(95, 135, 135, 0.35);
  --color-text: #c1c1c1;
  --color-muted: #999999;
  --color-border: #333333;
  --color-primary-soft: rgba(95, 135, 135, 0.18);
  --color-primary-soft-border: rgba(95, 135, 135, 0.38);
  --color-project-card: rgba(18, 18, 18, 0.88);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

img {
  max-width: 100%;
  display: block;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.section,
.footer {
  width: min(100% - 3rem, var(--max-width));
  margin: 0 auto;
}

.hero {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 8.5rem 0 6rem;
  position: relative;
  overflow: visible;
}

.hero-inner {
  width: min(100% - 3rem, var(--max-width));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 3rem;
}

.navbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 1.75rem;
  height: 64px;
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(100% - 3rem, var(--max-width));
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: none;
  border-radius: 0 0 18px 18px;
  z-index: 1000;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  grid-column: 3;
  justify-self: end;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.75rem;
  color: var(--color-text);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid var(--color-primary-soft-border);
  background-color: var(--color-primary-soft);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.theme-toggle:hover,
.theme-toggle:focus {
  transform: translateY(-1px);
  background-color: rgba(163, 122, 204, 0.18);
  border-color: var(--color-primary);
}

.theme-toggle .theme-icon {
  font-size: 1.15rem;
  line-height: 1;
}

body.dark-theme .theme-toggle {
  background-color: rgba(255, 255, 255, 0.04);
  border-color: var(--color-border);
}

body.dark-theme .theme-toggle:hover,
body.dark-theme .theme-toggle:focus {
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  gap: 1.5rem;
  padding: 0;
  margin: 0;
  grid-column: 2;
  justify-self: center;
}

.nav-links a {
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--color-highlight);
}

.hero-content {
  padding: 0;
  max-width: 640px;
  text-align: left;
}

.hero-eyebrow {
  text-transform: uppercase;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  color: var(--color-highlight);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin: 0 0 1rem;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-muted);
  margin-bottom: 2rem;
}

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

.hero-figure {
  flex-shrink: 0;
}

.hero-photo {
  width: 260px;
  height: 260px;
  object-fit: cover;
  border-radius: 24px;
  border: 2px solid var(--color-border);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  font-weight: 600;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
  border: 1px solid transparent;
}

.button.primary {
  background-color: var(--color-primary);
  color: #fff;
}

.button.primary:hover,
.button.primary:focus {
  transform: translateY(-2px);
  background-color: var(--color-primary-dark);
}

.button.secondary {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  border-color: var(--color-primary-soft-border);
}

.button.secondary:hover,
.button.secondary:focus {
  transform: translateY(-2px);
  border-color: var(--color-primary);
}

.section {
  padding: 4rem 1.5rem;
  text-align: center;
  scroll-margin-top: 120px;
}

.section-heading {
  max-width: 540px;
  margin: 0 auto 2rem;
  text-align: center;
}

.eyebrow {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--color-highlight);
  margin-bottom: 0.5rem;
}

.section h2 {
  margin: 0 0 1.5rem;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.card {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  padding: 1.75rem;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card-header h3 {
  margin: 0 0 0.25rem;
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0;
}

.card-link {
  margin-top: auto;
  font-weight: 600;
  color: var(--color-highlight);
}

.card-link:hover,
.card-link:focus {
  text-decoration: underline;
}

.section-items {
  display: grid;
  gap: 1.75rem;
}

.section-item {
  padding: 1.75rem;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  text-align: left;
}

.section-item h3 {
  margin: 0 0 0.5rem;
}

.section-item p {
  margin: 0 0 1rem;
  color: var(--color-text);
}

.section-item p:last-child {
  margin-bottom: 0;
}

.section-item ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  color: var(--color-muted);
}

/* Education modules */
.item-subheading {
  margin: 1.5rem 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-muted);
}

.module-list {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 0;
}

.module-bubble {
  padding: 1rem 1.25rem;
  background-color: var(--color-primary-soft);
  border: 1px solid var(--color-primary-soft-border);
  border-radius: 18px;
  color: var(--color-text);
}

.section-item .module-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.section-item .module-description {
  margin: 0;
  color: var(--color-muted);
}

.item-meta {
  margin: 0 0 1rem;
  color: var(--color-muted);
  font-weight: 500;
}

.section-item .project-highlights {
  margin-top: 1.75rem;
}

.section-item .card {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.section.section-error {
  background-color: var(--color-surface-raised);
  border: 1px dashed var(--color-border);
  border-radius: 20px;
  padding: 2rem;
  color: var(--color-muted);
}

.projects .project-feature {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  padding: 0;
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  overflow: hidden;
}

.project-copy {
  flex: 1 1 0;
  text-align: left;
  position: relative;
  z-index: 2;
  background-color: var(--color-project-card);
  border: 1px solid var(--color-border);
  padding: 1.75rem 2rem;
  margin: 2rem;
  border-radius: 18px;
  box-shadow: 0 18px 30px rgba(0, 0, 0, 0.12);
  max-width: 520px;
}

.project-copy h3 {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 3vw, 1.875rem);
}

.project-copy a {
  color: var(--color-highlight);
  text-decoration: none;
}

.project-copy a:hover,
.project-copy a:focus {
  text-decoration: underline;
}

.project-copy p {
  margin: 0;
  color: var(--color-text);
  max-width: 520px;
}

.project-media {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 1;
  pointer-events: none;
}

.project-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.skills .section-items {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.skills .section-item {
  padding: 1.5rem;
}

.contact .section-items {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: grid;
  gap: 0.75rem;
  color: var(--color-muted);
}

.contact-list span {
  font-weight: 600;
  color: var(--color-text);
  margin-right: 0.5rem;
}

.contact-form {
  display: grid;
  gap: 0.75rem;
  padding: 1.5rem;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  text-align: left;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  font: inherit;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.footer {
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

@media (max-width: 768px) {
  .hero-inner {
    flex-direction: column;
    width: min(100% - 2rem, var(--max-width));
    gap: 2.5rem;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 0.75rem);
    right: 1.5rem;
    flex-direction: column;
    background-color: var(--color-surface-raised);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--color-border);
    transform: scale(0.9);
    transform-origin: top right;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

  .nav-links.open {
    transform: scale(1);
    opacity: 1;
    pointer-events: auto;
  }

  .navbar {
    position: relative;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-content {
    text-align: center;
  }

  .projects .project-feature {
    flex-direction: column;
    text-align: center;
  }

  .project-copy {
    text-align: center;
    margin: 0;
  }

  .project-copy p {
    max-width: none;
  }

  .project-media {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    width: 100%;
  }

  .skills .section-items {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .section,
  .footer {
    width: min(100% - 2rem, var(--max-width));
  }

  .navbar {
    width: min(100% - 2rem, var(--max-width));
  }

  .hero {
    padding-top: 7.5rem;
    padding-bottom: 4rem;
  }
}