/* =========================================================
   Design tokens
   ========================================================= */
:root {
  --color-bg:             #0d1117;
  --color-surface:        #161b22;
  --color-border:         #21262d;
  --color-text-primary:   #e6edf3;
  --color-text-secondary: #8b949e;
  --color-accent:         #c9a84c;
  --color-accent-hover:   #e6c76a;
  --color-nav-bg:         rgba(13, 17, 23, 0.93);

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  8rem;

  --max-width: 860px;
  --nav-height: 60px;
  --radius: 4px;
  --transition: 200ms ease;

  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

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

html {
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

body {
  min-height: 100vh;
}

ul {
  list-style: none;
}

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

a:hover {
  color: var(--color-accent-hover);
}

/* =========================================================
   Layout
   ========================================================= */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

section {
  padding: var(--space-lg) 0;
}

section:nth-child(even) {
  background-color: var(--color-surface);
}

/* =========================================================
   Navigation
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: var(--color-nav-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-accent);
  white-space: nowrap;
}

.nav-brand:hover {
  color: var(--color-accent-hover);
}

.site-nav ul {
  display: flex;
  gap: var(--space-md);
}

.site-nav a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Hamburger button */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 32px;
  height: 32px;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* =========================================================
   Section headings
   ========================================================= */
.section-heading {
  font-size: 2rem;
  font-weight: 600;
  color: var(--color-text-primary);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-md);
}

/* =========================================================
   About / Hero
   ========================================================= */
#about {
  padding-top: calc(var(--space-lg) + var(--space-md));
  padding-bottom: var(--space-lg);
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text-primary);
}

.hero-title {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-xs);
}

.accent-rule {
  width: 60px;
  border: none;
  border-top: 2px solid var(--color-accent);
  margin: var(--space-md) 0;
}

.hero-summary {
  font-size: 1.05rem;
  color: var(--color-text-primary);
  max-width: 680px;
  margin-bottom: var(--space-md);
}

/* At a Glance */
.at-a-glance {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-md);
  padding: var(--space-md);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.glance-heading {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.glance-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.glance-list li {
  display: flex;
  flex-direction: column;
}

.glance-item-title {
  font-size: 0.9rem;
  color: var(--color-text-primary);
}

.glance-item-meta {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.languages {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

/* CTA buttons */
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.btn-outline {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border: 1.5px solid var(--color-accent);
  border-radius: var(--radius);
  color: var(--color-accent);
  font-size: 0.9rem;
  font-weight: 500;
  background: transparent;
  transition: background-color var(--transition), color var(--transition);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: var(--color-bg);
}

/* =========================================================
   Skills
   ========================================================= */
.skill-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
}

.skill-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.skill-category {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.skill-card p {
  font-size: 0.9rem;
  color: var(--color-text-primary);
  line-height: 1.8;
}

/* =========================================================
   Experience
   ========================================================= */
.role-card {
  border-left: 3px solid var(--color-border);
  padding: 0 0 var(--space-md) 1.5rem;
  margin-bottom: var(--space-md);
  transition: border-left-color var(--transition);
}

.role-card:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
}

.role-card:hover {
  border-left-color: var(--color-accent);
}

.role-company {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.role-title {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-top: 0.15rem;
}

.role-meta {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: 0.15rem;
  margin-bottom: 0.75rem;
}

.role-bullets {
  list-style: disc;
  padding-left: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.role-bullets li {
  font-size: 0.92rem;
  color: var(--color-text-primary);
}

/* =========================================================
   Projects
   ========================================================= */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.project-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.project-stack {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  font-weight: 600;
}

.project-card p:last-child {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.project-links {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
  flex-wrap: wrap;
}

.project-links .btn-outline {
  font-size: 0.8rem;
  padding: 0.4rem 1rem;
}

/* =========================================================
   Contact
   ========================================================= */
.contact-intro {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}

.contact-list {
  max-width: 480px;
}

.contact-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  gap: 1rem;
}

.contact-row:first-child {
  border-top: 1px solid var(--color-border);
}

.contact-row dt {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.contact-row dd {
  font-size: 0.92rem;
  color: var(--color-text-primary);
  text-align: right;
}

.contact-row dd a {
  color: var(--color-accent);
}

.contact-row dd a:hover {
  color: var(--color-accent-hover);
}

/* =========================================================
   Footer
   ========================================================= */
.site-footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-border);
}

.site-footer p {
  font-size: 0.82rem;
  color: var(--color-text-secondary);
  text-align: center;
}

/* =========================================================
   Responsive — narrow desktop
   ========================================================= */
@media (max-width: 900px) {
  .hero h1 {
    font-size: 2.8rem;
  }
}

/* =========================================================
   Responsive — mobile
   ========================================================= */
@media (max-width: 600px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm) 1.5rem;
    z-index: 99;
  }

  .site-nav.nav-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    display: block;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 1rem;
  }

  .site-nav ul li:last-child a {
    border-bottom: none;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-title {
    font-size: 1rem;
  }

  .at-a-glance {
    grid-template-columns: 1fr;
  }

  .section-heading {
    font-size: 1.6rem;
  }

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

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

/* =========================================================
   Accessibility
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition: none !important;
  }
}

a:focus-visible,
.btn-outline:focus-visible,
.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}