/* ============================================================
   Instrument Panel — an engineer's-workbench design system.
   Graphite + blueprint cyan + oscilloscope amber. Flat, not glassy.
   IBM Plex family throughout. Dark is the primary mode; the sim
   "screen" stays dark even in light mode, like real hardware.
   ============================================================ */

:root {
  --bg: #0a0d0f;
  --surface: #10151a;
  --panel: #0d1216;
  --text: #e7ecef;
  --muted: #7c8a93;
  --dim: #4b5860;
  --accent: #29d3ff;
  --accent-2: #ffb020;
  --ok: #35d07f;
  --border: #1e2830;
  --border-bright: #2c3a44;
  --radius: 4px;
  --grid-line: rgba(41, 211, 255, 0.055);
  --grid-line-strong: rgba(41, 211, 255, 0.11);
  --shadow: 0 2px 0 rgba(0, 0, 0, 0.3);

  --font-display: "IBM Plex Sans Condensed", "IBM Plex Sans", sans-serif;
  --font-body: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
}

[data-theme="light"] {
  --bg: #f2efe4;
  --surface: #fbf9f0;
  --panel: #0d1216;
  --text: #1c1d18;
  --muted: #66655a;
  --dim: #9a9888;
  --accent: #0e7490;
  --accent-2: #b45309;
  --ok: #15803d;
  --border: #ddd8c6;
  --border-bright: #c7c0a8;
  --grid-line: rgba(14, 116, 144, 0.07);
  --grid-line-strong: rgba(14, 116, 144, 0.14);
  --shadow: 0 2px 0 rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #f2efe4;
    --surface: #fbf9f0;
    --panel: #0d1216;
    --text: #1c1d18;
    --muted: #66655a;
    --dim: #9a9888;
    --accent: #0e7490;
    --accent-2: #b45309;
    --ok: #15803d;
    --border: #ddd8c6;
    --border-bright: #c7c0a8;
    --grid-line: rgba(14, 116, 144, 0.07);
    --grid-line-strong: rgba(14, 116, 144, 0.14);
    --shadow: 0 2px 0 rgba(0, 0, 0, 0.05);
  }
}

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

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

h1, h2, .wordmark span, .btn, .switch {
  font-family: var(--font-display);
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  color: inherit;
}

/* ---------------------------------------------------------------- Skip link / focus */
.skip-link {
  position: absolute;
  top: -48px;
  left: 16px;
  background: var(--accent);
  color: #000;
  padding: 10px 16px;
  z-index: 200;
  text-decoration: none;
  font-family: var(--font-mono);
  transition: top 0.15s ease;
}
.skip-link:focus { top: 12px; }

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------- Toolbar / nav */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.toolbar-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}

.toolbar-nav {
  display: flex;
  gap: 4px;
  font-family: var(--font-mono);
}

.toolbar-nav a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  padding: 8px 12px;
  border: 1px solid transparent;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.toolbar-nav a em {
  font-style: normal;
  color: var(--dim);
  font-size: 0.72rem;
}

.toolbar-nav a:hover {
  color: var(--text);
  border-color: var(--border);
}

.toolbar-nav a.is-active {
  color: var(--accent);
  border-color: var(--border);
  border-bottom-color: var(--accent);
}

.toolbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.12s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 34px;
  height: 34px;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
}
.nav-toggle .bar {
  width: 16px; height: 2px; margin: 0 auto;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle[aria-expanded="true"] .bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}
.mobile-nav a {
  text-decoration: none;
  color: var(--text);
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
}
.mobile-nav.is-open { display: flex; }

/* ---------------------------------------------------------------- Hero */
.hero {
  position: relative;
  padding: 56px 0 72px;
  overflow: hidden;
}

.grid-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    repeating-linear-gradient(to right, var(--grid-line) 0, var(--grid-line) 1px, transparent 1px, transparent 48px),
    repeating-linear-gradient(to bottom, var(--grid-line) 0, var(--grid-line) 1px, transparent 1px, transparent 48px);
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 5px 12px;
  margin-bottom: 20px;
  letter-spacing: 0.05em;
}

.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(53, 208, 127, 0.18);
}

.hero-name {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

.hero-role {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
}

.hero-bio {
  margin-top: 18px;
  max-width: 480px;
  color: var(--muted);
  font-size: 1rem;
}

.hero-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 5px 10px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  padding: 11px 18px;
  border: 1px solid var(--border-bright);
  cursor: pointer;
  transition: transform 0.1s ease, background-color 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #061014;
}
.btn-primary:hover { transform: translateY(-2px); }

.btn-ghost {
  background: transparent;
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ---------------------------------------------------------------- Instrument panel (sim) */
.panel {
  background: var(--surface);
  border: 1px solid var(--border-bright);
}

.panel-titlebar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.panel-lights {
  display: inline-flex;
  gap: 5px;
}
.panel-lights i {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--border-bright);
  display: block;
}
.panel-lights i:nth-child(1) { background: #ff5f57; }
.panel-lights i:nth-child(2) { background: #ffbd2e; }
.panel-lights i:nth-child(3) { background: #28c840; }

.panel-screen {
  position: relative;
  background: var(--panel);
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.panel-screen canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.hud {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  padding: 8px 10px;
  background: linear-gradient(to top, rgba(0,0,0,0.55), transparent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: rgba(41, 211, 255, 0.75);
  letter-spacing: 0.04em;
}
.hud b { color: var(--accent-2); font-weight: 500; }

.sim-play-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  background: rgba(13, 18, 22, 0.85);
  border: none;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  cursor: pointer;
}

.panel-controls {
  display: flex;
  border-top: 1px solid var(--border);
}

.switch {
  flex: 1;
  background: var(--surface);
  border: none;
  border-right: 1px solid var(--border);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  padding: 10px 6px;
  cursor: pointer;
  transition: all 0.12s ease;
}
.switch:last-child { border-right: none; }
.switch:hover { color: var(--text); }
.switch.is-active { background: var(--accent); color: #061014; }
.switch-reset:hover { color: var(--accent-2); }

/* ---------------------------------------------------------------- Sections */
.section { padding: 64px 0; border-top: 1px solid var(--border); }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.01em;
  margin-bottom: 32px;
}

.tag-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--accent);
}

/* ---------------------------------------------------------------- Stats */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}

.stat {
  background: var(--surface);
  padding: 20px;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.stat.is-visible { opacity: 1; transform: none; }

.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 600;
  color: var(--accent);
}

.stat-label {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  margin-top: 4px;
  text-transform: uppercase;
}

.stat-note {
  grid-column: 1 / -1;
  background: var(--surface);
  padding: 18px 20px;
  color: var(--muted);
  font-size: 0.95rem;
  border-top: 1px dashed var(--border);
}

/* ---------------------------------------------------------------- Controls (search/filter) */
.controls {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 28px;
}

.term-search {
  display: flex;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0 12px;
  font-family: var(--font-mono);
}

.term-prompt {
  color: var(--accent);
  font-size: 0.88rem;
  white-space: nowrap;
}

.search {
  flex: 1;
  padding: 12px 4px;
  font-size: 0.9rem;
  font-family: var(--font-mono);
  border: none;
  background: transparent;
  color: var(--text);
  outline: none;
}
.search::placeholder { color: var(--dim); }
.search::-webkit-search-cancel-button { filter: grayscale(1); }

.term-cursor {
  width: 8px; height: 16px;
  background: var(--accent);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
}

.filter {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 7px 12px;
  font-size: 0.78rem;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.12s ease;
}
.filter:hover { border-color: var(--accent); color: var(--text); }
.filter.is-active { border-color: var(--accent); color: var(--accent); background: var(--surface); }
.filter-count { color: var(--dim); margin-left: 2px; }
.filter.is-active .filter-count { color: var(--accent); }

/* ---------------------------------------------------------------- Project grid ("spec sheets") */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 18px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 18px;
  text-decoration: none;
  color: inherit;
  overflow: hidden;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease, border-color 0.15s ease;
}
.card.is-visible { opacity: 1; transform: none; }

.card::before, .card::after,
.card .corner-tl, .card .corner-br {
  content: "";
  position: absolute;
  width: 10px; height: 10px;
  border: 2px solid transparent;
  opacity: 0;
  transition: opacity 0.15s ease;
}
.card::before { top: -1px; left: -1px; border-top-color: var(--accent); border-left-color: var(--accent); }
.card::after { bottom: -1px; right: -1px; border-bottom-color: var(--accent); border-right-color: var(--accent); }

.card:hover { border-color: var(--border-bright); }
.card:hover::before, .card:hover::after { opacity: 1; }

.card .scanline {
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--accent);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
}
.card:hover .scanline {
  animation: sweep 0.6s ease-out;
}
@keyframes sweep {
  0% { opacity: 0.9; transform: translateY(0); }
  100% { opacity: 0; transform: translateY(220px); }
}

.card-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.card-icon {
  color: var(--accent);
  flex-shrink: 0;
}

.card-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  flex: 1;
}

.badge {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--ok);
  border: 1px solid var(--ok);
  padding: 2px 7px;
  white-space: nowrap;
}

.card-desc {
  color: var(--muted);
  font-size: 0.88rem;
  margin: 12px 0 14px;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--dim);
  display: flex;
  flex-direction: column;
  gap: 3px;
  margin-bottom: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
}
.card-meta b { color: var(--muted); font-weight: 500; }

.card-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
}
.tag::before { content: "["; color: var(--dim); }
.tag::after { content: "]"; color: var(--dim); }

.featured .card-name::after {
  content: " *";
  color: var(--accent-2);
}

/* ---------------------------------------------------------------- Empty state */
.empty {
  font-family: var(--font-mono);
  text-align: center;
  color: var(--muted);
  padding: 48px 0;
}

/* ---------------------------------------------------------------- Nameplate (contact) */
.nameplate {
  max-width: 560px;
  border: 1px dashed var(--border-bright);
  padding: 28px;
  position: relative;
}
.nameplate::before, .nameplate::after {
  content: "";
  position: absolute;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--border-bright);
  top: 10px;
}
.nameplate::before { left: 10px; }
.nameplate::after { right: 10px; }

.nameplate-row {
  display: flex;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.88rem;
}
.nameplate-row:last-of-type { border-bottom: none; }

.nameplate-key {
  width: 100px;
  flex-shrink: 0;
  color: var(--dim);
  letter-spacing: 0.04em;
}
.nameplate-val { color: var(--text); }
.nameplate-val a { color: var(--accent); text-decoration: none; }
.nameplate-val a:hover { text-decoration: underline; }

.nameplate-cta {
  margin-top: 22px;
  width: 100%;
  justify-content: center;
}

/* ---------------------------------------------------------------- Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  color: var(--dim);
  font-size: 0.76rem;
}

/* ---------------------------------------------------------------- Back to top */
.back-to-top {
  position: fixed;
  right: 20px; bottom: 20px;
  width: 40px; height: 40px;
  border: 1px solid var(--border-bright);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-mono);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  z-index: 90;
}
.back-to-top.is-visible { opacity: 1; transform: none; pointer-events: auto; }
.back-to-top:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------------------------------------------------------- Responsive */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .toolbar-nav { display: none; }
  .nav-toggle { display: flex; }
}

@media (max-width: 600px) {
  .toolbar-bar { height: 54px; }
  .hero { padding: 40px 0 48px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .nameplate-row { flex-direction: column; gap: 4px; }
  .nameplate-key { width: auto; }
  .footer-bar { flex-direction: column; align-items: flex-start; gap: 4px; }
}

/* ---------------------------------------------------------------- Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .card, .stat { opacity: 1; transform: none; transition: border-color 0.15s ease; }
  .term-cursor { animation: none; }
  .card:hover .scanline { animation: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}