/* ============================================================
   Firmware/Embedded Portfolio — dark & minimal
   Aesthetic: register maps, memory addresses, monospace
   ============================================================ */

:root {
  --bg:        #0a0b0d;
  --bg-elev:   #111317;
  --line:      #1d2026;
  --text:      #e6e8eb;
  --muted:     #767c87;
  --accent:    #4ade80;   /* signal green — "READY" */
  --accent-dim:#1f3d2a;
  --warn:      #fbbf24;
  --radius:    4px;
  --maxw:      1080px;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Space Grotesk", system-ui, -apple-system, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* faint blueprint grid */
.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: 48px 48px;
  opacity: 0.25;
  mask-image: radial-gradient(circle at 50% 30%, black, transparent 80%);
}

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

/* ---------- Boot sequence ---------- */
.boot {
  position: fixed; inset: 0; z-index: 100;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity .5s ease;
}
.boot.done { opacity: 0; pointer-events: none; }
.bootlog {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  line-height: 1.8;
  white-space: pre-wrap;
  max-width: 90vw;
}

/* ---------- Top bar ---------- */
.topbar {
  display: flex; justify-content: space-between; align-items: center;
  max-width: var(--maxw); margin: 0 auto;
  padding: 28px 24px;
}
.logo { font-family: var(--mono); font-weight: 700; letter-spacing: .5px; }
.logo-accent { color: var(--accent); }
.nav { display: flex; gap: 26px; }
.nav a {
  font-family: var(--mono); font-size: 13px; color: var(--muted);
  text-decoration: none; transition: color .2s;
}
.nav a:hover { color: var(--text); }

/* ---------- Hero ---------- */
.hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: 80px 24px 100px;
}
.eyebrow {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  margin-bottom: 24px; letter-spacing: 1px;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 700; line-height: 1.05; letter-spacing: -1.5px;
  margin-bottom: 28px;
}
.accent { color: var(--accent); }
.hero-sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--muted); max-width: 620px; margin-bottom: 36px;
}
.hero-sub strong { color: var(--text); font-weight: 600; }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 64px; }

.btn {
  font-family: var(--mono); font-size: 14px; font-weight: 500;
  padding: 13px 24px; border-radius: var(--radius);
  text-decoration: none; transition: all .2s; display: inline-block;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #06210f; }
.btn-primary:hover { background: #6ee79a; transform: translateY(-2px); }
.btn-ghost { border-color: var(--line); color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* register strip */
.reg-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-elev); overflow: hidden;
}
.reg {
  padding: 16px 18px; border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 4px;
}
.reg:last-child { border-right: none; }
.reg-addr { font-family: var(--mono); font-size: 11px; color: var(--muted); }
.reg-label { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 1px; }
.reg-val { font-family: var(--mono); font-size: 14px; font-weight: 700; }
.reg-val.ok { color: var(--accent); }

/* ---------- Sections ---------- */
.section { max-width: var(--maxw); margin: 0 auto; padding: 70px 24px; }
.section-head {
  display: flex; align-items: baseline; gap: 16px;
  border-bottom: 1px solid var(--line); padding-bottom: 18px; margin-bottom: 40px;
}
.section-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem); font-weight: 700; letter-spacing: -.5px;
}
.section-meta { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.card {
  background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 24px; text-decoration: none;
  color: var(--text); transition: all .25s; display: block;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); }
.card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.card-addr { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.card-status {
  font-family: var(--mono); font-size: 10px; font-weight: 700; letter-spacing: 1px;
  padding: 3px 8px; border-radius: 3px;
}
.card-status.wip { background: var(--accent-dim); color: var(--accent); }
.card-title { font-size: 1.3rem; font-weight: 600; margin-bottom: 10px; }
.card-desc { color: var(--muted); font-size: .95rem; margin-bottom: 18px; }
.tags { list-style: none; display: flex; gap: 8px; flex-wrap: wrap; }
.tags li {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  border: 1px solid var(--line); padding: 3px 9px; border-radius: 3px;
}
.card-empty {
  border-style: dashed; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  color: var(--muted); gap: 8px;
}
.card-empty .plus { font-size: 2rem; color: var(--line); }
.card-empty p { font-family: var(--mono); font-size: 12px; }

/* ---------- About ---------- */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.about-lead { font-size: 1.5rem; font-weight: 500; letter-spacing: -.3px; }
.about-body { color: var(--muted); }

/* ---------- Stack ---------- */
.stack-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.stack-col h4 {
  font-family: var(--mono); font-size: 12px; color: var(--accent);
  letter-spacing: 1px; margin-bottom: 14px; text-transform: uppercase;
}
.stack-col ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.stack-col li { color: var(--muted); font-size: .95rem; }

/* ---------- Contact ---------- */
.contact { text-align: center; padding: 90px 24px; }
.contact .section-title { margin-bottom: 12px; }
.contact-sub { color: var(--muted); margin-bottom: 32px; }
.contact-links { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer {
  max-width: var(--maxw); margin: 0 auto;
  padding: 32px 24px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-family: var(--mono); font-size: 12px; color: var(--muted);
}

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .nav { display: none; }
  .reg-strip { grid-template-columns: repeat(2, 1fr); }
  .reg:nth-child(2) { border-right: none; }
  .cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 20px; }
  .stack-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}

/* keyboard focus */
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px;
}