/* ---------- Tokens ---------- */
:root {
  --ink: #14171c;
  --panel: #1b1f26;
  --panel-border: rgba(243, 239, 230, 0.09);
  --chalk: #f3efe6;
  --chalk-dim: #d3cfc4;
  --amber: #e8a33d;
  --slate: #8891a0;
  --ember: #c15b3d;

  --font-display: 'JetBrains Mono', ui-monospace, monospace;
  --font-body: 'Source Serif 4', Georgia, serif;

  --wrap: 1120px;
  --gap-section: clamp(4.5rem, 9vw, 8rem);
  --radius: 6px;
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; color: var(--chalk); }
p { margin: 0; }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--amber);
  color: var(--ink);
  padding: 0.75rem 1rem;
  z-index: 100;
  font-family: var(--font-display);
}
.skip-link:focus { left: 1rem; top: 1rem; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(20, 23, 28, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--panel-border);
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}
.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.12em;
  text-decoration: none;
  color: var(--chalk);
}
.wordmark.small { font-size: 0.85rem; color: var(--slate); }
.site-nav {
  display: flex;
  gap: 2rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
}
.site-nav a { text-decoration: none; color: var(--slate); transition: color 0.15s ease; }
.site-nav a:hover, .site-nav a:focus-visible { color: var(--chalk); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-ghost {
  border-color: var(--panel-border);
  color: var(--chalk);
}
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--amber); color: var(--amber); }
.btn-solid {
  background: var(--amber);
  color: var(--ink);
  font-weight: 600;
}
.btn-solid:hover, .btn-solid:focus-visible { background: #f2b458; }
.btn-large { font-size: 1rem; padding: 0.9rem 1.75rem; }
.btn-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-display);
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--amber);
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
.btn-link:hover, .btn-link:focus-visible { border-color: var(--amber); }

/* ---------- Type helpers ---------- */
.eyebrow {
  font-family: var(--font-display);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber);
  margin: 0 0 1rem;
}
.section-title {
  font-size: clamp(1.75rem, 3.2vw, 2.5rem);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: 2.5rem;
}

/* ---------- Hero ---------- */
.hero {
  padding: clamp(5rem, 12vw, 8.5rem) 0 var(--gap-section);
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.25rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  max-width: 18ch;
}
.hero-title .accent { color: var(--amber); }
.hero-sub {
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--chalk-dim);
  max-width: 46ch;
  margin-top: 1.75rem;
}
.hero-actions {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-top: 2.5rem;
  flex-wrap: wrap;
}

/* ---------- Services ---------- */
.services {
  padding: var(--gap-section) 0;
  border-top: 1px solid var(--panel-border);
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.card {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 2rem 1.75rem;
}
.card-tag {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  margin: 0 0 1rem;
}
.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
}
.card p:last-child {
  font-family: var(--font-body);
  color: var(--chalk-dim);
}

/* ---------- Diagram section ---------- */
.diagram-section {
  padding: var(--gap-section) 0;
  border-top: 1px solid var(--panel-border);
}
.toggle-row {
  display: inline-flex;
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 2.5rem;
}
.toggle-btn {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  background: transparent;
  color: var(--slate);
  border: none;
  padding: 0.6rem 1.5rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.toggle-btn + .toggle-btn { border-left: 1px solid var(--panel-border); }
.toggle-btn.is-active { background: var(--amber); color: var(--ink); font-weight: 600; }
.toggle-btn:not(.is-active):hover { color: var(--chalk); }

.diagram-frame {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem 1rem;
}
.wire-svg { width: 100%; height: auto; overflow: visible; }

.wires path {
  fill: none;
  stroke-width: 2;
}
.wires-manual path { stroke: var(--ember); }
.wires-assisted path { stroke: var(--amber); }

.nodes circle { fill: var(--chalk); }

.labels text {
  font-family: var(--font-display);
  font-size: 13px;
  fill: var(--slate);
  text-anchor: middle;
}

/* default state: manual visible, assisted hidden */
.wires-assisted, .labels-assisted { opacity: 0; transition: opacity 0.5s ease; }
.wires-manual, .labels-manual { opacity: 1; transition: opacity 0.4s ease 0.15s; }

.wire-draw {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  transition: stroke-dashoffset 0.7s ease;
}

[data-diagram].is-assisted .wires-manual,
[data-diagram].is-assisted .labels-manual {
  opacity: 0;
  transition: opacity 0.3s ease;
}
[data-diagram].is-assisted .wires-assisted,
[data-diagram].is-assisted .labels-assisted {
  opacity: 1;
  transition: opacity 0.5s ease 0.2s;
}
[data-diagram].is-assisted .wire-draw { stroke-dashoffset: 0; }

.diagram-caption {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--chalk-dim);
  margin-top: 1.5rem;
}
.diagram-note {
  font-family: var(--font-body);
  color: var(--chalk-dim);
  max-width: 56ch;
  margin-top: 1rem;
}

/* ---------- Case study ---------- */
.case-study {
  padding: var(--gap-section) 0;
  border-top: 1px solid var(--panel-border);
}
.case-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 3rem;
  align-items: start;
}
.case-copy p { font-family: var(--font-body); color: var(--chalk-dim); margin-bottom: 1.1rem; }
.case-facts {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-left: 3px solid var(--ember);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.case-facts dl { margin: 0; }
.fact { padding: 0.85rem 0; border-bottom: 1px solid var(--panel-border); }
.fact:last-child { border-bottom: none; padding-bottom: 0; }
.fact:first-child { padding-top: 0; }
.fact dt {
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  margin-bottom: 0.3rem;
}
.fact dd { margin: 0; font-family: var(--font-body); color: var(--chalk); }

/* ---------- About ---------- */
.about {
  padding: var(--gap-section) 0;
  border-top: 1px solid var(--panel-border);
}
.about-copy {
  font-family: var(--font-body);
  font-size: clamp(1.05rem, 1.5vw, 1.2rem);
  color: var(--chalk-dim);
  max-width: 62ch;
}

/* ---------- Contact ---------- */
.contact {
  padding: var(--gap-section) 0 calc(var(--gap-section) * 0.8);
  border-top: 1px solid var(--panel-border);
  text-align: center;
}
.contact-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
}
.contact-sub {
  font-family: var(--font-body);
  color: var(--chalk-dim);
  max-width: 40ch;
  margin: 1.25rem auto 2.25rem;
  font-size: 1.1rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--panel-border);
  padding: 1.75rem 0;
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--slate);
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- Scroll reveal ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 860px) {
  .card-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: 1fr; }
  .site-nav { display: none; }
}

@media (max-width: 480px) {
  .header-row { gap: 0.75rem; }
  .btn-ghost { padding: 0.55rem 0.9rem; font-size: 0.78rem; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}