/* adhv.me — the page as a printed circuit board.
   Solder-mask green, white silkscreen, ENIG gold. One committed look. */

@font-face {
  font-family: "Share Tech Mono";
  src: url("fonts/sharetechmono.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}

:root {
  --mask: #0b4534;        /* solder mask green */
  --mask-deep: #08392b;   /* board edge / vignette */
  --silk: #e8f3ec;        /* silkscreen white */
  --silk-dim: #9fc4b0;    /* secondary silkscreen (tinted, not gray) */
  --gold: #d9b64a;        /* ENIG pads */
  --gold-bright: #f0d070;
  --trace: #0e5540;       /* copper under mask: barely-lighter green */
  --trace-lit: #1a6b50;
  --mono: "Share Tech Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--mask-deep);
  font-family: var(--mono);
  color: var(--silk);
  min-height: 100dvh;
}

.board {
  position: relative;
  overflow: hidden;
  min-height: 100dvh;
  margin: clamp(6px, 1.2vw, 14px);
  background:
    radial-gradient(140% 100% at 50% 0%, rgba(255,255,255,0.04), transparent 60%),
    var(--mask);
  border: 2px solid rgba(0, 0, 0, 0.35);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(22px, 4vh, 44px);
  padding: clamp(48px, 7vh, 84px) clamp(18px, 4vw, 64px) clamp(64px, 9vh, 96px);
}

/* routed copper under the mask */
.traces {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* mounting holes */
.hole {
  position: absolute;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--mask-deep);
  border: 5px solid var(--gold);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.25) inset;
}
.hole.tl { top: 14px; left: 14px; }
.hole.tr { top: 14px; right: 14px; }
.hole.bl { bottom: 14px; left: 14px; }
.hole.br { bottom: 14px; right: 14px; }

/* silkscreen text is always uppercase; the font carries the register */
.designator {
  position: absolute;
  top: -1.4em;
  left: 0;
  font-size: 0.8rem;
  color: var(--silk-dim);
  letter-spacing: 0.08em;
}
.pin1 {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--silk);
  opacity: 0.9;
}

/* --- U0: the main IC --- */
.mcu {
  position: relative;
  z-index: 1;
  border: 3px solid var(--silk);
  padding: clamp(20px, 4vw, 40px) clamp(24px, 5vw, 56px) clamp(26px, 4.5vw, 46px);
  text-align: center;
  background: var(--mask);
  max-width: 640px;
  margin-top: 1.2em;
}
.mcu h1 {
  margin: 0;
  font-size: clamp(1.9rem, 6.4vw, 3.6rem);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.05;
}
.mcu .function {
  margin: 10px 0 0;
  color: var(--silk-dim);
  font-size: clamp(0.85rem, 2.4vw, 1.05rem);
  letter-spacing: 0.12em;
}
/* IC pins along the bottom edge */
.mcu .pins,
.component::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: -8px;
  height: 8px;
  background: repeating-linear-gradient(
    90deg,
    var(--gold) 0 10px,
    transparent 10px 24px
  );
}
.mcu .pins { display: block; }

/* --- components --- */
.components {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 300px));
  justify-content: center;
  gap: clamp(28px, 4vw, 44px) clamp(22px, 3vw, 40px);
  width: 100%;
  max-width: 1080px;
}
.component {
  position: relative;
  display: block;
  border: 2px solid var(--silk);
  background: var(--mask);
  color: var(--silk);
  text-decoration: none;
  padding: 18px 16px 20px;
  transition: border-color 0.12s ease-out, box-shadow 0.12s ease-out,
    transform 0.12s ease-out;
}
.component .name {
  display: block;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}
.component .fn {
  display: block;
  color: var(--silk-dim);
  font-size: 0.85rem;
  line-height: 1.45;
  min-height: 2.5em;
}
.component .net {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  color: var(--gold);
  letter-spacing: 0.04em;
}
.component:hover,
.component:focus-visible {
  border-color: var(--gold-bright);
  box-shadow: 0 0 0 1px var(--gold-bright), 0 0 22px rgba(217, 182, 74, 0.25);
  transform: translateY(-2px);
}
.component:hover .net { color: var(--gold-bright); }

/* --- J1: GitHub as the edge connector --- */
.edge-connector {
  position: relative;
  z-index: 1;
  display: block;
  text-align: center;
  color: var(--silk);
  text-decoration: none;
  padding: 16px 28px 30px;
  border: 2px solid var(--silk);
  border-bottom: none;
  min-width: min(420px, 86vw);
  transition: border-color 0.12s ease-out, box-shadow 0.12s ease-out;
}
.edge-connector .name {
  font-size: 1.15rem;
  letter-spacing: 0.14em;
}
.edge-connector .net {
  display: block;
  margin-top: 6px;
  font-size: 0.8rem;
  color: var(--gold);
}
.edge-connector .fingers {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 0;
  height: 16px;
  background: repeating-linear-gradient(
    90deg,
    var(--gold) 0 18px,
    var(--mask-deep) 18px 26px
  );
}
.edge-connector:hover,
.edge-connector:focus-visible {
  border-color: var(--gold-bright);
  box-shadow: 0 0 22px rgba(217, 182, 74, 0.25);
}

/* --- title block --- */
.titleblock {
  position: absolute;
  right: clamp(18px, 3vw, 40px);
  bottom: 12px;
  display: flex;
  gap: 0;
  border: 1px solid var(--silk-dim);
  font-size: 0.68rem;
  color: var(--silk-dim);
  letter-spacing: 0.06em;
}
.titleblock span {
  padding: 4px 10px;
  border-right: 1px solid var(--silk-dim);
  white-space: nowrap;
}
.titleblock span:last-child { border-right: none; }

:focus-visible { outline: 3px solid var(--gold-bright); outline-offset: 3px; }

@media (max-width: 700px) {
  .board { gap: 30px; padding-bottom: 84px; }
  .titleblock { position: static; margin-top: 8px; flex-wrap: wrap; justify-content: center; }
  .titleblock span { border: none; }
  .component .fn { min-height: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .component, .edge-connector { transition: none; }
  .component:hover { transform: none; }
}