/* ---------------------------------------------------
   Tokens
--------------------------------------------------- */
:root {
  --ink-900: #0A1F33;   /* deep blueprint navy — base background */
  --ink-800: #0E2A45;   /* panel background */
  --ink-700: #163656;   /* borders / dividers */
  --line: rgba(159, 197, 232, 0.14);   /* grid lines */
  --paper: #EAF1F8;     /* primary text, "chalk on blueprint" */
  --paper-dim: #93A9BE; /* muted text */
  --amber: #FF8A3D;     /* single accent, used sparingly */
  --amber-dim: #C96A2C;
  --radius: 3px;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --sans: 'Inter', system-ui, sans-serif;
  --content-width: 760px;
}

* { box-sizing: border-box; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--sans);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* Blueprint grid backdrop */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 90%);
}

main, header, footer { position: relative; z-index: 1; }

/* ---------------------------------------------------
   Section coordinate labels (structural, not decorative)
--------------------------------------------------- */
.coord {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--amber);
  margin: 0 0 0.9rem 0;
}

section, .hero { max-width: var(--content-width); margin: 0 auto; padding: 5rem 1.5rem; }

h1, h2 { font-family: var(--mono); font-weight: 700; margin: 0; }
h2 { font-size: 1.6rem; margin-bottom: 1.75rem; letter-spacing: -0.01em; }

/* ---------------------------------------------------
   Top bar
--------------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(10, 31, 51, 0.86);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--ink-700);
}
.topbar-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.mark { font-family: var(--mono); font-weight: 800; color: var(--paper); text-decoration: none; letter-spacing: 0.02em; }
.nav { display: flex; gap: 1.75rem; }
.nav a {
  text-decoration: none;
  color: var(--paper-dim);
  font-size: 0.92rem;
  font-family: var(--mono);
  transition: color 0.15s ease;
}
.nav a:hover, .nav a:focus-visible { color: var(--amber); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--paper); display: block; }

@media (max-width: 640px) {
  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--ink-800);
    border-bottom: 1px solid var(--ink-700);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 1rem;
    display: none;
  }
  .nav.open { display: flex; }
  .nav-toggle { display: flex; }
}

/* ---------------------------------------------------
   Hero
--------------------------------------------------- */
.hero { padding-top: 6rem; padding-bottom: 4rem; }
.hero-name {
  font-size: clamp(2.1rem, 6vw, 3.2rem);
  line-height: 1.1;
  color: var(--paper);
}
.hero-role {
  font-family: var(--mono);
  font-size: 1.02rem;
  color: var(--paper-dim);
  margin: 0.9rem 0 1.3rem;
}
.role-static { color: var(--paper); }
.typed { color: var(--amber); }
.cursor { color: var(--amber); animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

.hero-desc { max-width: 56ch; color: var(--paper-dim); }

.hero-actions { display: flex; gap: 0.9rem; margin: 2rem 0 3rem; flex-wrap: wrap; }
.btn {
  font-family: var(--mono);
  font-size: 0.88rem;
  padding: 0.7rem 1.3rem;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.btn-primary { background: var(--amber); color: var(--ink-900); font-weight: 700; }
.btn-primary:hover { transform: translateY(-1px); }
.btn-outline { border-color: var(--ink-700); color: var(--paper); }
.btn-outline:hover { border-color: var(--amber); color: var(--amber); }

.hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  overflow: hidden;
}
.meta-item {
  background: var(--ink-800);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.meta-label { font-family: var(--mono); font-size: 0.68rem; color: var(--paper-dim); }
.meta-value { font-size: 0.9rem; }

@media (max-width: 560px) {
  .hero-meta { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------
   About
--------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 2.5rem;
}
.about-text p { color: var(--paper-dim); margin: 0 0 1rem; }
.about-facts { margin: 0; display: grid; gap: 1rem; }
.about-facts div { border-left: 2px solid var(--ink-700); padding-left: 0.9rem; }
.about-facts dt { font-family: var(--mono); font-size: 0.7rem; color: var(--amber); margin-bottom: 0.2rem; }
.about-facts dd { margin: 0; font-size: 0.92rem; }

@media (max-width: 680px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ---------------------------------------------------
   Skills — schematic matrix, not pill tags
--------------------------------------------------- */
.skills-matrix { display: grid; gap: 1px; background: var(--ink-700); border: 1px solid var(--ink-700); border-radius: var(--radius); overflow: hidden; }
.skill-row { background: var(--ink-800); padding: 1rem 1.2rem; display: grid; grid-template-columns: 140px 1fr; gap: 1rem; align-items: baseline; }
.skill-cat { font-family: var(--mono); font-size: 0.78rem; color: var(--amber); }
.skill-items { color: var(--paper-dim); font-size: 0.92rem; }

@media (max-width: 560px) {
  .skill-row { grid-template-columns: 1fr; gap: 0.3rem; }
}

/* ---------------------------------------------------
   Projects — spec-sheet cards
--------------------------------------------------- */
.project-list { display: grid; gap: 1.1rem; }
.project-card {
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  background: var(--ink-800);
  padding: 1.4rem 1.5rem;
}
.project-head { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; margin-bottom: 0.6rem; }
.project-title { font-family: var(--mono); font-size: 1rem; font-weight: 700; }
.project-title a { text-decoration: none; }
.project-title a:hover { color: var(--amber); }
.project-year { font-family: var(--mono); font-size: 0.75rem; color: var(--paper-dim); }
.project-desc { color: var(--paper-dim); font-size: 0.93rem; margin: 0 0 0.9rem; }
.project-specs { display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; font-family: var(--mono); font-size: 0.72rem; }
.project-specs span { color: var(--paper-dim); }
.project-specs strong { color: var(--paper); font-weight: 600; }

/* ---------------------------------------------------
   Education — timeline
--------------------------------------------------- */
.timeline { border-left: 2px solid var(--ink-700); display: grid; gap: 1.6rem; padding-left: 1.3rem; }
.timeline-item { position: relative; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.72rem;
  top: 0.35rem;
  width: 8px;
  height: 8px;
  background: var(--amber);
  border-radius: 50%;
}
.timeline-period { font-family: var(--mono); font-size: 0.72rem; color: var(--amber); }
.timeline-title { font-weight: 600; margin: 0.2rem 0; }
.timeline-detail { color: var(--paper-dim); font-size: 0.9rem; margin: 0; }

/* ---------------------------------------------------
   Contact
--------------------------------------------------- */
.contact-lede { color: var(--paper-dim); max-width: 52ch; }
.contact-links { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 1.5rem; }
.contact-link {
  font-family: var(--mono);
  font-size: 0.85rem;
  text-decoration: none;
  border: 1px solid var(--ink-700);
  border-radius: var(--radius);
  padding: 0.65rem 1.1rem;
  transition: border-color 0.12s ease, color 0.12s ease;
}
.contact-link:hover { border-color: var(--amber); color: var(--amber); }

/* ---------------------------------------------------
   Footer
--------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--ink-700);
  padding: 2rem 1.5rem;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--paper-dim);
}
.footer-sep { margin: 0 0.5rem; }

/* Keyboard focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}