/* CH32V003 HAPTIC CORE — Y2K ACID theme
   Derived from MiniProjects/StyleCollection/y2k-acid */

:root {
  --bg-dark: #000000;
  --neon-lime: #39ff14;
  --neon-magenta: #ff007f;
  --neon-cyan: #00f0ff;

  --font-wide: 'Syne', sans-serif;
  --font-mono: 'Share Tech Mono', monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-dark);
  color: #fff;
  font-family: var(--font-mono);
  overflow-x: hidden;
}

.acid-wrapper {
  position: relative;
  min-height: 100vh;
  width: 100%;
}

/* Background rave grid strobe */
.grid-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(to right, rgba(255, 0, 127, 0.1) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 0, 127, 0.1) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 1;
}

.grid-backdrop.speed-rave { animation: strobe 0.2s infinite alternate; }
.grid-backdrop.speed-slow { animation: strobe 1.5s infinite alternate; }

@keyframes strobe {
  0% {
    background-image:
      linear-gradient(to right, rgba(57, 255, 20, 0.12) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(57, 255, 20, 0.12) 1px, transparent 1px);
    background-color: rgba(255, 0, 127, 0.02);
  }
  100% {
    background-image:
      linear-gradient(to right, rgba(0, 240, 255, 0.12) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(0, 240, 255, 0.12) 1px, transparent 1px);
    background-color: rgba(57, 255, 20, 0.02);
  }
}

.acid-container {
  position: relative;
  z-index: 5;
  max-width: 1100px;
  margin: 0 auto;
  padding: 60px 20px;
  display: flex;
  flex-direction: column;
  gap: 34px;
}

/* ============ Header ============ */

.acid-header { text-align: center; }

.acid-title {
  font-family: var(--font-wide);
  font-size: clamp(3rem, 9vw, 6.5rem);
  font-weight: 800;
  letter-spacing: -2px;
  color: var(--neon-lime);
  text-shadow: 4px 4px 0px var(--neon-magenta);
  margin: 14px 0 10px 0;
  text-transform: uppercase;
}

.acid-subtitle {
  color: var(--neon-cyan);
  font-size: 0.95rem;
  font-weight: bold;
  letter-spacing: 2px;
  margin: 8px 0;
}

/* ============ Nav ============ */

.acid-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  position: sticky;
  top: 10px;
  z-index: 20;
}

.acid-nav a {
  color: var(--neon-lime);
  text-decoration: none;
  font-family: var(--font-wide);
  font-size: 0.8rem;
  border: 2px solid var(--neon-lime);
  padding: 5px 13px;
  background: #000;
  box-shadow: 3px 3px 0px var(--neon-lime);
  transition: all 0.1s;
}

.acid-nav a:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0px var(--neon-lime);
  background: var(--neon-lime);
  color: #000;
}

.acid-nav a:active {
  transform: translate(2px, 2px);
  box-shadow: 0 0 0 var(--neon-lime);
}

/* ============ Cards ============ */

.acid-card {
  background: #111;
  border: 3px solid #fff;
  border-radius: 12px;
  padding: 30px;
  position: relative;
  color: #fff;
  scroll-margin-top: 70px;
}

.card-icon {
  font-size: 1.8rem;
  position: absolute;
  top: 15px;
  right: 20px;
}

.acid-card h2 {
  font-family: var(--font-wide);
  font-size: 1.5rem;
  margin-top: 10px;
  letter-spacing: -1px;
  text-transform: uppercase;
}

.acid-card h3 {
  font-family: var(--font-wide);
  font-size: 1.05rem;
  letter-spacing: -0.5px;
  margin: 26px 0 8px;
  color: inherit;
}

.acid-card p {
  font-size: 0.92rem;
  line-height: 1.6;
  opacity: 0.92;
}

.acid-card a { color: var(--neon-cyan); }

.card-cyan { border-color: var(--neon-cyan); box-shadow: 6px 6px 0px var(--neon-cyan); }
.card-cyan h2, .card-cyan h3 { color: var(--neon-cyan); }

.card-magenta { border-color: var(--neon-magenta); box-shadow: 6px 6px 0px var(--neon-magenta); }
.card-magenta h2, .card-magenta h3 { color: var(--neon-magenta); }

.card-lime { border-color: var(--neon-lime); box-shadow: 6px 6px 0px var(--neon-lime); }
.card-lime h2, .card-lime h3 { color: var(--neon-lime); }

.fine-print { font-size: 0.8rem; opacity: 0.65; }

/* ============ Buttons ============ */

.control-row { display: flex; gap: 10px; margin-top: 20px; }
.control-row.center { justify-content: center; }

.acid-btn {
  background: transparent;
  border: 2px solid var(--neon-magenta);
  color: var(--neon-magenta);
  font-family: var(--font-wide);
  font-size: 0.8rem;
  padding: 8px 16px;
  cursor: pointer;
  box-shadow: 3px 3px 0px var(--neon-magenta);
  transition: all 0.1s;
}

.acid-btn.active, .acid-btn:hover {
  background: var(--neon-magenta);
  color: #000;
  font-weight: bold;
}

.acid-btn:active {
  transform: translate(3px, 3px);
  box-shadow: 0 0 0 var(--neon-magenta);
}

/* ============ Spec grid ============ */

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin: 20px 0;
}

.spec {
  border: 2px solid rgba(0, 240, 255, 0.4);
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: rgba(0, 240, 255, 0.04);
}

.spec-num {
  font-family: var(--font-wide);
  font-size: 1.3rem;
  color: var(--neon-lime);
}

.spec-label { font-size: 0.78rem; opacity: 0.8; }

/* ============ Tables ============ */

.table-scroll { overflow-x: auto; margin: 16px 0; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 9px 11px;
  text-align: left;
  vertical-align: top;
}

th {
  font-family: var(--font-wide);
  font-size: 0.75rem;
  letter-spacing: 1px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--neon-cyan);
}

td.num, th.num { text-align: right; white-space: nowrap; }

tfoot td {
  font-family: var(--font-wide);
  color: var(--neon-lime);
  background: rgba(57, 255, 20, 0.06);
}

tr.trap td { background: rgba(255, 0, 127, 0.12); }
tr.trap td:first-child { color: var(--neon-magenta); font-weight: bold; }
td.good { color: var(--neon-lime); }
td.hl { color: var(--neon-lime); font-weight: bold; }

/* ============ Code blocks ============ */

.code-block {
  position: relative;
  margin: 14px 0;
  border: 2px solid var(--neon-lime);
  border-radius: 8px;
  background: #050505;
  box-shadow: 4px 4px 0 rgba(57, 255, 20, 0.35);
}

.code-block pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  color: var(--neon-lime);
  font-size: 0.85rem;
  line-height: 1.5;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: #000;
  border: 2px solid var(--neon-cyan);
  color: var(--neon-cyan);
  font-family: var(--font-wide);
  font-size: 0.65rem;
  padding: 4px 10px;
  cursor: pointer;
  box-shadow: 2px 2px 0 var(--neon-cyan);
  transition: all 0.1s;
}

.copy-btn:hover { background: var(--neon-cyan); color: #000; }
.copy-btn:active { transform: translate(2px, 2px); box-shadow: 0 0 0 var(--neon-cyan); }

.inline-code {
  font-family: var(--font-mono);
  color: var(--neon-lime);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.35);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.85em;
  white-space: nowrap;
}

/* ============ Lists ============ */

.step-list { padding-left: 22px; display: grid; gap: 14px; font-size: 0.92rem; line-height: 1.6; }
.step-list strong { color: var(--neon-lime); }

.tight-list { padding-left: 20px; font-size: 0.9rem; line-height: 1.7; }

/* ============ Gotcha accordions ============ */

.gotcha { margin: 10px 0; border: 2px solid rgba(57, 255, 20, 0.5); border-radius: 8px; overflow: hidden; }

.gotcha-head {
  display: block;
  width: 100%;
  text-align: left;
  background: rgba(57, 255, 20, 0.07);
  color: var(--neon-lime);
  font-family: var(--font-wide);
  font-size: 0.85rem;
  letter-spacing: 0.5px;
  border: none;
  padding: 13px 16px;
  cursor: pointer;
  transition: background 0.15s;
}

.gotcha-head:hover { background: rgba(57, 255, 20, 0.18); }

.gotcha-body {
  display: none;
  padding: 4px 18px 8px;
  border-top: 1px solid rgba(57, 255, 20, 0.3);
}

.gotcha.open .gotcha-body { display: block; }
.gotcha.open .gotcha-head { background: var(--neon-lime); color: #000; }

/* ============ Flow diagram ============ */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 18px 0;
  font-size: 0.8rem;
}

.flow span:not(.arrow) {
  border: 2px solid var(--neon-cyan);
  border-radius: 6px;
  padding: 7px 12px;
  background: rgba(0, 240, 255, 0.06);
  color: var(--neon-cyan);
  font-family: var(--font-wide);
  font-size: 0.72rem;
}

.flow .arrow { color: var(--neon-magenta); font-size: 1.1rem; }

/* ============ Footer ============ */

.acid-footer {
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.85;
  padding-bottom: 30px;
}

.acid-footer a { color: var(--neon-lime); }
.acid-footer p:first-child {
  font-family: var(--font-wide);
  color: var(--neon-magenta);
  letter-spacing: 2px;
}

/* ============ Small screens ============ */

@media (max-width: 560px) {
  .acid-container { padding: 40px 12px; }
  .acid-card { padding: 22px 16px; }
  .acid-nav { position: static; }
}