/* ── Shared structure ─────────────────────────────────────────── */
* { box-sizing: border-box; }

html {
  --bg: #03040a;
  --spine: #5cf6ff;
  --branch: #c77dff;
  --node: #ff4fd8;
  --text: #e8f0ff;
  --muted: #8090b8;
  --panel: rgba(10, 14, 28, 0.92);
  --border: rgba(199, 125, 255, 0.28);
  --accent: #5cf6ff;
  --radius: 12px;
  --tag-radius: 999px;
  --font: "Segoe UI", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --shadow: 0 0 24px rgba(255, 79, 216, 0.07);
  --glow-text: 0 0 20px rgba(92, 246, 255, 0.4), 0 0 40px rgba(255, 79, 216, 0.25);
  --void-a: rgba(92, 246, 255, 0.08);
  --void-b: rgba(199, 125, 255, 0.06);
  --void-size: 48px;
  --void-opacity: 0.22;
  --grain-opacity: 0.04;
  --card-active-border: rgba(92, 246, 255, 0.65);
  --card-active-shadow: 0 0 28px rgba(92, 246, 255, 0.18);
  --tab-border: rgba(92, 246, 255, 0.25);
  --edge-width: 2;
  font-family: var(--font);
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font);
  transition: background 0.25s ease, color 0.2s ease;
}

.void {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
/* Grid / paper hatch — opacity via --void-opacity so grain stays independent */
.void::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: var(--void-opacity, 0.22);
  background:
    repeating-linear-gradient(0deg, transparent, transparent calc(var(--void-size) - 1px), var(--void-a) var(--void-size)),
    repeating-linear-gradient(90deg, transparent, transparent calc(var(--void-size) - 1px), var(--void-b) var(--void-size));
  transition: opacity 0.25s ease;
}
/* Cheap film grain: one static tiled SVG noise + CSS steps() translate (no canvas/WebGL/rAF) */
.void::after {
  content: "";
  position: absolute;
  top: -30%;
  left: -30%;
  width: 160%;
  height: 160%;
  pointer-events: none;
  opacity: var(--grain-opacity, 0.045);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 160 160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 160px 160px;
  background-repeat: repeat;
  animation: void-grain 0.9s steps(4) infinite;
  /* Dark substrate: invert the noise so flecks read as light grain. */
  filter: invert(1);
}
@keyframes void-grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2.2%, 1.4%); }
  50% { transform: translate(1.6%, -2.8%); }
  75% { transform: translate(-1.1%, 2.1%); }
  100% { transform: translate(0, 0); }
}
@media (prefers-reduced-motion: reduce) {
  .void::after {
    animation: none;
    /* keep a faint static texture; no motion */
  }
}

.tabs, header, main {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.tabs { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; padding-top: 1.25rem; }

.tab {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--tab-border);
  border-radius: var(--tag-radius);
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
}
.tab.active {
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.tab:disabled { opacity: 0.4; cursor: not-allowed; }

.look-toggle {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--tab-border);
  border-radius: var(--tag-radius);
  padding: 0.35rem 0.7rem 0.35rem 0.9rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
}
.look-toggle:hover { color: var(--text); border-color: var(--accent); }
.look-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.look-toggle-track {
  width: 2rem;
  height: 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--tab-border);
  position: relative;
  flex: 0 0 auto;
  background: color-mix(in srgb, var(--muted) 18%, transparent);
}
.look-toggle-knob {
  position: absolute;
  top: 1px;
  left: 1px;
  width: 0.78rem;
  height: 0.78rem;
  border-radius: 50%;
  background: var(--muted);
  transition: transform 0.15s ease, background 0.15s ease;
}
html[data-look="white"] .look-toggle-knob {
  transform: translateX(0.92rem);
  background: var(--bg);
}
html[data-look="white"] .look-toggle-track {
  background: var(--accent);
  border-color: var(--accent);
}
@media (prefers-reduced-motion: reduce) {
  .look-toggle-knob { transition: none; }
}

.eyebrow {
  letter-spacing: 0.28em;
  font-size: 0.68rem;
  color: var(--accent);
  margin: 0 0 0.4rem;
}
h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  text-shadow: var(--glow-text);
}
.intro {
  margin: 0.4rem 0 0.2rem;
  max-width: 34rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 400;
  line-height: 1.4;
}
.lede { color: var(--muted); max-width: 40rem; }


.graph {
  width: 100%;
  height: auto;
  max-height: min(560px, 70vh);
  display: block;
  overflow: visible;
}
.graph[data-orient="vertical"] {
  max-height: none;
  max-width: 100%;
}
.cards-toggle {
  margin-top: 0.85rem;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--tab-border);
  border-radius: var(--tag-radius);
  padding: 0.35rem 0.9rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
}
.cards-toggle:hover { color: var(--text); border-color: var(--accent); }
.cards-toggle[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
}

.cards { display: grid; gap: 0.75rem; margin-top: 0.5rem; }
.card[hidden] { display: none; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.card h2 { margin: 0 0 0.35rem; font-size: 1.05rem; }
.card .meta { color: var(--accent); font-size: 0.8rem; margin-bottom: 0.35rem; }
.card p { margin: 0; color: var(--muted); line-height: 1.45; }
.card p a {
  color: var(--branch);
  text-decoration-color: color-mix(in srgb, var(--branch) 55%, transparent);
  text-underline-offset: 0.16em;
  overflow-wrap: anywhere;
}
.card p a:hover { color: var(--accent); }
.card .fork { color: var(--branch); font-size: 0.72rem; margin-bottom: 0.25rem; }
.card.active {
  border-color: var(--card-active-border);
  box-shadow: var(--card-active-shadow);
}

.tags { margin-top: 0.55rem; display: flex; flex-wrap: wrap; gap: 0.3rem; }
.tag {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--branch);
  border: 1px solid color-mix(in srgb, var(--branch) 50%, transparent);
  padding: 0.12rem 0.4rem;
  border-radius: var(--tag-radius);
}

.panel.hidden, .hidden { display: none; }
.graph .node { cursor: pointer; }
.graph .node .orb { transition: r 0.15s ease, fill 0.15s ease; }
.graph .node:hover .orb,
.graph .node.active .orb { fill: var(--accent); }
.graph .node.active .orb { stroke: var(--node); stroke-width: 2.5; }
.graph .node text { fill: var(--text); font-family: inherit; }
.graph .edge { fill: none; stroke: var(--branch); stroke-width: var(--edge-width); }
.graph .edge.adhoc-connection {
  fill: none;
  stroke: var(--spine);
  stroke-width: 0.8;
  stroke-opacity: 0.62;
  stroke-linecap: round;
  stroke-dasharray: 1 4;
  pointer-events: none;
}
.graph .edge.main-filament {
  fill: none;
  stroke: var(--branch);
  stroke-width: 0.75;
  stroke-opacity: 0.22;
  pointer-events: none;
}
.graph .main-spore {
  fill: var(--spine);
  fill-opacity: 0.3;
  pointer-events: none;
}
.graph .spine-line { stroke-width: 3; }
.graph .spine-arrow { fill: var(--spine); stroke: none; }
.graph .tick {
  stroke: var(--spine);
  stroke-width: 1.5;
  opacity: 0.85;
}
.graph .tick-label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.04em;
}
.graph .axis-caption {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  opacity: 0.85;
}

/* Spores — deep blue substrate, lime capillary hyphae, hyphal-tip nodes.
   Ribbon forks: soft sheath and a quieter middle layer. */

html[data-skin="spores"] .graph .edge.mold-sheath {
  stroke-width: 6.2;
  stroke-opacity: 0.28;
  fill: none;
  stroke-linecap: round;
}
html[data-skin="spores"] .graph .edge.mold-mid {
  stroke-width: 3;
  stroke-opacity: 0.5;
  fill: none;
  stroke-linecap: round;
}
html[data-skin="spores"] .graph .edge.mold-core {
  stroke-width: 1.35;
  fill: none;
}
html[data-skin="spores"] .graph .edge.mold-whisker {
  stroke-width: 0.9;
  stroke-opacity: 0.28;
  fill: none;
  stroke-linecap: round;
  pointer-events: none;
}
html[data-skin="spores"] .graph .edge.mold-anas {
  stroke-width: 1;
  stroke-opacity: 0.22;
  fill: none;
  stroke-linecap: round;
  pointer-events: none;
}
html[data-skin="spores"] .graph .edge.mold-field {
  stroke-width: 1.05;
  stroke-opacity: 0.22;
  fill: none;
  stroke-linecap: round;
  pointer-events: none;
}
.graph .field-spore {
  fill: var(--branch);
  fill-opacity: 0.3;
  pointer-events: none;
}

/* Soft halo / lobe / tip pieces stay clickable via parent .node */
.graph .orb-halo {
  fill: color-mix(in srgb, var(--node) 35%, transparent);
  stroke: none;
  pointer-events: none;
}
.graph .orb-lobe {
  opacity: 0.85;
}
.graph .orb-tip {
  fill: none;
  stroke: var(--node);
  stroke-width: 2.2;
  stroke-linecap: round;
  pointer-events: none;
}
.graph .node:hover .orb-halo,
.graph .node.active .orb-halo {
  fill: color-mix(in srgb, var(--accent) 40%, transparent);
}
.graph .node:hover .orb-tip,
.graph .node.active .orb-tip {
  stroke: var(--accent);
}

html[data-skin="spores"] {
  --bg: #020818;
  --spine: #38bdf8;
  --branch: #a3e635;
  --node: #bef264;
  --text: #e0f2fe;
  --muted: #64748b;
  --panel: rgba(4, 12, 32, 0.94);
  --border: rgba(163, 230, 53, 0.28);
  --accent: #84cc16;
  --radius: 10px;
  --tag-radius: 999px;
  --font: "Segoe UI", system-ui, sans-serif;
  --shadow: 0 0 26px rgba(163, 230, 53, 0.1);
  --glow-text: 0 0 18px rgba(56, 189, 248, 0.35), 0 0 40px rgba(163, 230, 53, 0.2);
  --void-a: rgba(56, 189, 248, 0.06);
  --void-b: rgba(163, 230, 53, 0.04);
  --void-size: 40px;
  --void-opacity: 0.2;
  --grain-opacity: 0.05;
  --card-active-border: rgba(163, 230, 53, 0.7);
  --card-active-shadow: 0 0 28px rgba(56, 189, 248, 0.18);
  --tab-border: rgba(56, 189, 248, 0.28);
  --edge-width: 1.6;
}
html[data-skin="spores"] body {
  background:
    radial-gradient(720px 440px at 55% -12%, #0a2040 0%, transparent 55%),
    radial-gradient(480px 300px at 10% 60%, #061428 0%, transparent 50%),
    var(--bg);
}
html[data-skin="spores"] .graph .orb {
  fill: var(--node);
  stroke: color-mix(in srgb, var(--branch) 60%, transparent);
  stroke-width: 1.1;
}
/* Keep the hub's translucent support layers distinct from its gradient core. */
html[data-skin="spores"] .graph .orb-halo {
  fill: color-mix(in srgb, var(--node) 30%, transparent);
  stroke: none;
}
html[data-skin="spores"] .graph .orb-mid {
  fill: color-mix(in srgb, var(--node) 52%, transparent);
  stroke: none;
}
html[data-skin="spores"] .graph .orb-tip {
  stroke: var(--node);
  stroke-width: 2;
}
html[data-skin="spores"] .graph .edge.mold-core { stroke-width: 1.15; }
html[data-skin="spores"] .graph .edge.mold-sheath {
  stroke-width: 5.8;
  stroke-opacity: 0.3;
}
html[data-skin="spores"] .graph .spine-line { stroke-width: 2.2; opacity: 0.42; }
html[data-skin="spores"] .graph .tick { opacity: 0.48; }
html[data-skin="spores"] .graph .tick-label,
html[data-skin="spores"] .graph .axis-caption { opacity: 0.62; }
html[data-skin="spores"] .tag {
  color: var(--branch);
  border-color: color-mix(in srgb, var(--branch) 45%, transparent);
}

html[data-fork-style="ribbon"] .graph .edge.mold-sheath {
  stroke-width: 4.2;
  stroke-opacity: 0.22;
}
html[data-fork-style="ribbon"] .graph .edge.mold-mid {
  stroke-width: 2.1;
  stroke-opacity: 0.42;
}

/* Filled organic ribbons; main links are steady, child forks taper. */
.graph .edge.mold-ribbon {
  stroke: none;
  pointer-events: none;
}
.graph .edge.mold-ribbon-outer {
  fill: var(--branch);
  fill-opacity: 0.28;
}
.graph .edge.mold-ribbon-inner {
  fill: var(--branch);
  fill-opacity: 0.9;
}
.graph .orb-mid {
  fill: color-mix(in srgb, var(--node) 58%, transparent);
  stroke: none;
  pointer-events: none;
}
.graph .node.hub .orb-halo,
.graph .node.hub .orb-mid,
.graph .node.active.hub .orb-halo,
.graph .node.active.hub .orb-mid,
.graph .node:hover.hub .orb-halo,
.graph .node:hover.hub .orb-mid {
  stroke: none;
}

/* SVG theming via CSS variables */
.graph .orb { fill: var(--node); stroke: var(--text); stroke-width: 1.5; stroke-linejoin: round; }
.graph .anchor { fill: var(--spine); }
.graph .edge { stroke: var(--branch); stroke-width: var(--edge-width); }
.graph .node text { fill: var(--text); font-family: inherit; font-size: 11px; }
.graph .node text.node-label-child { font-size: 12.5px; font-weight: 500; }
.graph .node text.node-label-root { font-size: 16px; font-weight: 650; letter-spacing: 0.01em; }
.graph .node:hover .orb,
.graph .node.active .orb { fill: var(--accent); }
.graph .node.active .orb { stroke: var(--node); stroke-width: 2.5; }

html[data-skin="spores"] .graph .edge { stroke: var(--branch); }

.connection {
  color: var(--branch);
  font-size: 0.72rem;
  margin: 0.15rem 0;
}

/* White mode — same Spores nodes and Ribbon forks on a white ground.
   Rules sit last so they win ties with the Spores / Ribbon stroke opacities. */
html[data-look="white"] {
  --bg: #ffffff;
  --spine: #0c4a6e;
  --branch: #3f6212;
  --node: #365314;
  --text: #1c1917;
  --muted: #44403c;
  --panel: #ffffff;
  --border: rgba(28, 25, 23, 0.16);
  --accent: #3f6212;
  --shadow: 0 1px 2px rgba(28, 25, 23, 0.06);
  --glow-text: none;
  --void-a: rgba(28, 25, 23, 0.07);
  --void-b: rgba(28, 25, 23, 0.05);
  --void-size: 40px;
  --void-opacity: 0.55;
  --grain-opacity: 0.045;
  --card-active-border: rgba(63, 98, 18, 0.85);
  --card-active-shadow: 0 0 0 1px rgba(63, 98, 18, 0.35);
  --tab-border: rgba(28, 25, 23, 0.22);
  --edge-width: 1.6;
  background: #ffffff;
}
html[data-look="white"] body {
  background: #ffffff;
}
html[data-look="white"] .void::after {
  filter: none;
}
html[data-look="white"] .look-toggle {
  color: var(--text);
  border-color: var(--border);
}
html[data-look="white"] .graph .orb,
html[data-look="white"] .graph .orb-tip,
html[data-look="white"] .graph .edge {
  filter: none;
}
html[data-look="white"] .graph .edge.mold-sheath {
  stroke-opacity: 0.55;
}
html[data-look="white"] .graph .edge.mold-mid {
  stroke-opacity: 0.72;
}
html[data-look="white"] .graph .edge.mold-whisker,
html[data-look="white"] .graph .edge.mold-anas {
  stroke-opacity: 0.7;
}
html[data-look="white"] .graph .edge.mold-ribbon-outer {
  fill-opacity: 0.4;
}
html[data-look="white"] .graph .edge.mold-ribbon-inner {
  fill-opacity: 0.95;
}
html[data-look="white"] .graph .orb-halo {
  fill: color-mix(in srgb, var(--node) 28%, transparent);
}