:root {
  --black: #050805;
  --black-2: #0a120a;
  --phosphor: #29ff7a;
  --phosphor-dim: #12a851;
  --phosphor-deep: #063a1c;
  --amber: #ffb02e;
  --cyan: #35e2d6;
  --window-bg: #eef4ec;
  --window-bg-2: #e2ece0;
  --ink: #10160f;
  --ink-soft: #3d4a3c;
  --link: #0645ad;

  --cat-smallpublishing: #29ff7a;
  --cat-politheory: #ffb02e;
  --cat-arttheory: #35e2d6;
  --cat-theo: #12a851;
  --cat-other: #6fae86;

  font-size: 16px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: var(--black);
  color: var(--phosphor);
  font-family: 'Share Tech Mono', monospace;
}

/* ---------- circuit board backdrop, no image assets ---------- */

body {
  background-color: var(--black);
  background-image:
    /* component glow blobs */
    radial-gradient(ellipse 500px 380px at 12% 15%, rgba(41,255,122,0.10), transparent 60%),
    radial-gradient(ellipse 420px 420px at 88% 20%, rgba(53,226,214,0.08), transparent 60%),
    radial-gradient(ellipse 480px 380px at 25% 88%, rgba(255,176,46,0.06), transparent 60%),
    radial-gradient(ellipse 520px 420px at 78% 82%, rgba(41,255,122,0.08), transparent 60%),
    /* solder pad dot grid */
    radial-gradient(circle, rgba(41,255,122,0.16) 1px, transparent 1.4px),
    /* circuit trace grid */
    repeating-linear-gradient(0deg, rgba(41,255,122,0.05) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(90deg, rgba(41,255,122,0.05) 0 1px, transparent 1px 96px);
  background-size:
    auto, auto, auto, auto,
    24px 24px,
    96px 96px,
    96px 96px;
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat, repeat, repeat, repeat;
  position: relative;
}

/* scanline overlay */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  background: repeating-linear-gradient(
    0deg,
    rgba(0,0,0,0.16) 0,
    rgba(0,0,0,0.16) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: multiply;
  opacity: 0.5;
}

/* ---------- splash ---------- */

.splash {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: var(--black);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  transition: opacity 1.1s ease;
  cursor: pointer;
}

.splash img {
  max-width: min(80vw, 640px);
  max-height: 70vh;
  object-fit: contain;
  box-shadow: 0 0 40px rgba(41,255,122,0.25);
  border: 1px solid var(--phosphor-dim);
}

.splash-hint {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--phosphor-dim);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.splash.fade-out {
  opacity: 0;
}

.splash.gone {
  display: none;
}

/* ---------- masthead ---------- */

.masthead {
  position: relative;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.4rem;
  background: var(--black-2);
  border-bottom: 1px solid var(--phosphor-dim);
  box-shadow: 0 0 24px rgba(41,255,122,0.12);
  flex-wrap: wrap;
}

.masthead h1 {
  font-family: 'Orbitron', sans-serif;
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: 1.5px;
  margin: 0;
  color: var(--phosphor);
  text-shadow: 0 0 10px rgba(41,255,122,0.55);
}

.blink {
  animation: blink 1.1s steps(2, start) infinite;
}
@keyframes blink { to { visibility: hidden; } }

.subtitle {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.78rem;
  margin: 0.2rem 0 0 0.1rem;
  color: var(--phosphor-dim);
  letter-spacing: 0.5px;
}

.masthead-right {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tool-btn {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.78rem;
  background: var(--black);
  color: var(--phosphor);
  border: 1px solid var(--phosphor-dim);
  border-radius: 2px;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  transition: all 0.12s ease;
}

.tool-btn:hover {
  border-color: var(--phosphor);
  box-shadow: 0 0 10px rgba(41,255,122,0.45);
}
.tool-btn:active { transform: translateY(1px); }

.tool-btn-primary {
  background: var(--phosphor-deep);
  color: var(--phosphor);
  border-color: var(--phosphor);
}

/* ---------- connect banner ---------- */

.connect-banner {
  position: absolute;
  top: 4.4rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 25;
  background: var(--black-2);
  color: var(--phosphor);
  border: 1px solid var(--phosphor);
  box-shadow: 0 0 16px rgba(41,255,122,0.4);
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  padding: 0.4rem 1rem;
  border-radius: 2px;
}

.connect-banner button {
  margin-left: 0.6rem;
  background: none;
  border: none;
  color: var(--amber);
  text-decoration: underline;
  cursor: pointer;
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.78rem;
}

.hidden { display: none !important; }

/* ---------- board ---------- */

.board-viewport {
  position: absolute;
  inset: 0;
  top: 64px;
  overflow: hidden;
  cursor: grab;
}

.board-viewport.panning { cursor: grabbing; }

.board {
  position: absolute;
  transform-origin: 0 0;
  width: 4000px;
  height: 3000px;
}

.threads {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.thread-line {
  fill: none;
  stroke: var(--phosphor);
  stroke-width: 2;
  opacity: 0.75;
  filter: drop-shadow(0 0 3px rgba(41,255,122,0.6));
}

.thread-via {
  fill: var(--black);
  stroke: var(--phosphor);
  stroke-width: 1.5;
}

.cards-layer {
  position: absolute;
  inset: 0;
}

.empty-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font-family: 'Share Tech Mono', monospace;
  font-size: 1rem;
  color: var(--phosphor-dim);
  letter-spacing: 1px;
  pointer-events: none;
}
.empty-state p { margin: 0.2rem 0; }

/* ---------- windows ("wikipedia" style cards) ---------- */

.card {
  position: absolute;
  width: 240px;
  background: var(--window-bg);
  border: 1px solid var(--phosphor-dim);
  box-shadow: 0 0 0 1px var(--black), 0 6px 18px rgba(0,0,0,0.55), 0 0 14px rgba(41,255,122,0.15);
  cursor: grab;
  user-select: none;
  transition: box-shadow 0.15s ease;
}

.card:active { cursor: grabbing; }

.card.connect-source {
  box-shadow: 0 0 0 2px var(--amber), 0 0 16px rgba(255,176,46,0.6);
}

.card.connect-hover {
  box-shadow: 0 0 0 2px var(--cyan), 0 0 16px rgba(53,226,214,0.6);
}

.card-titlebar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.5rem;
  background: linear-gradient(180deg, #142014, #0c150c);
  border-bottom: 1px solid var(--phosphor-dim);
}

.pin {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
  box-shadow: 0 0 6px 1px currentColor;
}

.card-title {
  font-family: 'Orbitron', sans-serif;
  font-weight: 700;
  font-size: 0.68rem;
  letter-spacing: 0.4px;
  line-height: 1.2;
  color: var(--phosphor);
  text-transform: uppercase;
  flex: 1;
  word-break: break-word;
}

.card-winbuttons {
  display: flex;
  gap: 3px;
  flex: none;
}

.card-winbuttons span {
  width: 6px;
  height: 6px;
  background: var(--phosphor-dim);
  display: block;
}

.card-content {
  padding: 0.65rem 0.65rem 0.5rem;
}

.card-notes {
  font-family: 'Source Serif 4', serif;
  font-size: 0.84rem;
  line-height: 1.45;
  color: var(--ink);
  margin: 0 0 0.4rem;
  word-break: break-word;
  white-space: pre-wrap;
}

.card-link {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem;
  color: var(--link);
  word-break: break-all;
  display: inline-block;
}

.card-meta {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.66rem;
  color: var(--ink-soft);
  background: var(--window-bg-2);
  border-top: 1px solid rgba(6,58,28,0.25);
  padding: 0.3rem 0.65rem;
  display: flex;
  justify-content: space-between;
  text-transform: lowercase;
}

/* ---------- legend ---------- */

.legend {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.5rem 1rem;
  background: var(--black-2);
  border-top: 1px solid var(--phosphor-dim);
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  color: var(--phosphor-dim);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 5px 1px currentColor;
}

/* ---------- modal ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.card-form {
  background: var(--window-bg);
  border: 1px solid var(--phosphor);
  box-shadow: 0 0 30px rgba(41,255,122,0.35);
  width: 100%;
  max-width: 380px;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.card-form-titlebar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: linear-gradient(180deg, #142014, #0c150c);
  border-bottom: 1px solid var(--phosphor-dim);
  color: var(--phosphor);
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.78rem;
}

.led-mini {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--phosphor);
  box-shadow: 0 0 6px 1px var(--phosphor);
  flex: none;
}

.card-form-body {
  padding: 1rem 1.2rem 1.1rem;
  display: flex;
  flex-direction: column;
}

.card-form label {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.72rem;
  text-transform: lowercase;
  color: var(--ink-soft);
  margin: 0.55rem 0 0.2rem;
}

.card-form input,
.card-form textarea,
.card-form select {
  font-family: 'Source Serif 4', serif;
  font-size: 0.85rem;
  padding: 0.4rem 0.5rem;
  border: 1px solid var(--phosphor-dim);
  background: #ffffff;
  color: var(--ink);
  border-radius: 1px;
}

.card-form input:focus,
.card-form textarea:focus,
.card-form select:focus {
  outline: none;
  border-color: var(--phosphor);
  box-shadow: 0 0 8px rgba(41,255,122,0.4);
}

.card-form textarea { resize: vertical; }

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 1.1rem;
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .masthead { padding: 0.7rem 0.9rem; }
  .masthead h1 { font-size: 1.1rem; }
  .subtitle { font-size: 0.68rem; }
  .tool-btn { font-size: 0.68rem; padding: 0.42rem 0.6rem; }
  .card { width: 190px; }
  .legend { font-size: 0.6rem; gap: 0.6rem; }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  .tool-btn, .card, .splash { transition: none; }
  .blink { animation: none; }
}

/* ---------- focus visibility ---------- */

button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
.card:focus-visible {
  outline: 2px solid var(--phosphor);
  outline-offset: 2px;
}