:root {
  --grid-green: #35d07f;
  --grid-cyan: #27c6d8;
  --grid-red: #ff5c5c;
  --grid-violet: #8c72ff;
}

.gridscape-page { background: var(--paper); }

.gridscape-header {
  background: linear-gradient(135deg, #101c24, #173541 62%, #1c4c4e);
  border-bottom: 7px solid var(--grid-green);
  color: #fff;
  padding: 22px clamp(18px, 4vw, 64px) clamp(52px, 7vw, 92px);
}

.gridscape-header .topbar { color: #fff; }
.gridscape-header .brand, .gridscape-header .nav-links a { color: inherit; }

.gridscape-titlebar {
  align-items: end;
  display: flex;
  gap: 32px;
  justify-content: space-between;
  margin: clamp(62px, 9vw, 120px) auto 0;
  max-width: 1420px;
}

.gridscape-titlebar h1 {
  color: #fff;
  font-size: clamp(4rem, 12vw, 10rem);
  letter-spacing: -.07em;
  line-height: .78;
}

.gridscape-tagline { color: rgba(255,255,255,.82); font-size: clamp(1rem, 2vw, 1.35rem); margin-top: 28px; }
.gridscape-main { overflow: hidden; }

.game-intro, .game-glossary {
  display: grid;
  gap: clamp(32px, 7vw, 100px);
  grid-template-columns: minmax(0,.85fr) minmax(0,1.15fr);
  margin: 0 auto;
  max-width: 1420px;
  padding: clamp(64px, 9vw, 120px) clamp(20px, 5vw, 72px);
}

.game-intro h2, .game-glossary h2, .mission-result h2, .final-result h2 { font-size: clamp(2.2rem, 5vw, 5.8rem); line-height: 1; margin-top: 12px; }
.game-intro > div > p:not(.eyebrow), .game-glossary > div > p:not(.eyebrow) { color: var(--ink-soft); font-size: 1.08rem; line-height: 1.7; margin-top: 20px; }

.game-principles { border-top: 2px solid var(--ink); list-style: none; }
.game-principles li { display: grid; gap: 10px; grid-template-columns: 52px 1fr; padding: 22px 0; border-bottom: 1px solid var(--line); }
.game-principles span { color: var(--teal-dark); font-family: var(--mono); }
.game-principles strong { font-size: 1.2rem; }
.game-principles p { color: var(--ink-soft); grid-column: 2; }

.game-shell { background: #0e1a21; color: #fff; padding: clamp(24px, 5vw, 62px); }
.game-shell[hidden], .mission-result[hidden], .final-result[hidden], .game-intro[hidden] { display: none; }

.game-hud { border: 1px solid rgba(255,255,255,.24); display: grid; grid-template-columns: repeat(4,1fr); margin: 0 auto; max-width: 1420px; }
.game-hud div { padding: 14px clamp(12px,3vw,28px); }
.game-hud div + div { border-left: 1px solid rgba(255,255,255,.2); }
.game-hud span, .result-metrics span, .final-score span { color: rgba(255,255,255,.62); display: block; font-family: var(--mono); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; }
.game-hud strong { color: #fff; font-size: clamp(1.2rem,3vw,2rem); }

.mission-brief { margin: 46px auto 28px; max-width: 1420px; }
.mission-brief h2 { color: #fff; font-size: clamp(2rem,5vw,4.8rem); line-height: 1; margin-top: 9px; }
.mission-brief > p:not(.eyebrow) { color: rgba(255,255,255,.76); line-height: 1.6; margin-top: 15px; max-width: 820px; }
.pressure-meter { align-items: center; display: grid; gap: 12px; grid-template-columns: auto minmax(120px,320px) 34px; margin-top: 22px; }
.pressure-meter span { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; }
.pressure-meter div { background: rgba(255,255,255,.12); height: 8px; }
.pressure-meter i { background: linear-gradient(90deg,var(--grid-green),var(--grid-red)); display: block; height: 100%; transition: width 280ms ease; }

.game-workspace { display: grid; gap: 28px; grid-template-columns: minmax(0,1.45fr) minmax(300px,.55fr); margin: 0 auto; max-width: 1420px; }
.board-wrap { min-width: 0; }
.grid-board { aspect-ratio: 1; background: linear-gradient(rgba(255,255,255,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.055) 1px,transparent 1px),#13242d; background-size: 20% 20%; border: 1px solid rgba(255,255,255,.26); display: grid; grid-template-columns: repeat(5,1fr); grid-template-rows: repeat(5,1fr); max-height: 680px; max-width: 680px; position: relative; }
.grid-links { height: 100%; inset: 0; position: absolute; width: 100%; z-index: 0; }
.grid-links line { marker-end: url(#arrow); stroke: rgba(39,198,216,.55); stroke-width: 4; }
.grid-links line.active { animation: flowPulse 1.6s infinite; stroke: var(--grid-red); }

.grid-node { align-items: center; align-self: center; background: #172f39; border: 2px solid rgba(255,255,255,.34); border-radius: 50%; color: #fff; cursor: pointer; display: flex; flex-direction: column; height: clamp(62px,9vw,96px); justify-content: center; justify-self: center; padding: 8px; position: relative; transition: transform 180ms ease,border-color 180ms ease,background 180ms ease; width: clamp(62px,9vw,96px); z-index: 2; }
.grid-node:hover, .grid-node:focus-visible, .grid-node.selected { border-color: var(--grid-green); transform: scale(1.08); }
.grid-node.layer-symptom { background: #592c31; border-color: var(--grid-red); }
.grid-node.layer-exchange { border-color: var(--grid-cyan); }
.grid-node.layer-boundary { border-color: #e4b458; }
.grid-node.layer-environment { border-color: var(--grid-violet); }
.grid-node.hidden-node span { filter: blur(4px); opacity: .55; }
.grid-node b { font-size: 1.35rem; line-height: 1; }
.grid-node span { font-size: clamp(.52rem,1vw,.68rem); line-height: 1.1; margin-top: 5px; max-width: 11ch; text-align: center; }
.grid-node.intervened::after { background: var(--grid-green); border: 2px solid #0e1a21; border-radius: 50%; content: "✓"; font-weight: 800; height: 24px; position: absolute; right: -5px; top: -5px; width: 24px; }
.board-instruction { color: rgba(255,255,255,.65); font-size: .82rem; line-height: 1.5; margin-top: 12px; max-width: 680px; }

.control-panel { background: #f4f0e8; border: 2px solid #fff; color: #16222b; padding: clamp(20px,3vw,34px); }
.control-panel h3 { font-size: clamp(1.5rem,3vw,2.5rem); line-height: 1.05; margin-top: 9px; }
.control-panel > p:not(.eyebrow) { color: #42515a; line-height: 1.58; margin-top: 14px; }
.node-readout { border-bottom: 1px solid #b9b4aa; border-top: 1px solid #b9b4aa; display: grid; grid-template-columns: repeat(3,1fr); margin-top: 22px; }
.node-readout div { padding: 12px 4px; }
.node-readout dt { font-family: var(--mono); font-size: .63rem; text-transform: uppercase; }
.node-readout dd { font-weight: 750; margin: 4px 0 0; }
.action-grid { display: grid; gap: 9px; margin-top: 22px; }
.action-grid button { background: #fff; border: 1px solid #16222b; color: #16222b; cursor: pointer; display: grid; padding: 12px 14px; text-align: left; }
.action-grid button:hover, .action-grid button:focus-visible { background: #dff5e9; outline: 2px solid #1f8c60; outline-offset: 2px; }
.action-grid button:disabled { cursor: not-allowed; opacity: .38; }
.action-grid span { font-weight: 800; }
.action-grid small { color: #56636b; margin-top: 2px; }

.game-message { align-items: baseline; background: rgba(255,255,255,.08); display: flex; gap: 12px; margin: 20px auto 0; max-width: 1420px; padding: 15px 18px; }
.game-message span { color: rgba(255,255,255,.72); }

.mission-result, .final-result { background: #11232c; color: #fff; padding: clamp(60px,10vw,130px) clamp(20px,6vw,90px); text-align: center; }
.mission-result > *, .final-result > * { margin-left: auto; margin-right: auto; max-width: 1000px; }
.mission-result p:not(.eyebrow), .final-result p:not(.eyebrow) { color: rgba(255,255,255,.76); font-size: 1.08rem; line-height: 1.7; margin-top: 20px; }
.result-metrics { border: 1px solid rgba(255,255,255,.25); display: grid; grid-template-columns: repeat(3,1fr); margin-top: 34px; }
.result-metrics div { padding: 20px; }
.result-metrics div + div { border-left: 1px solid rgba(255,255,255,.2); }
.result-metrics strong, .final-score strong { color: #fff; font-size: clamp(1.8rem,4vw,3.8rem); }
.result-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 30px; }
.final-score { margin-top: 34px; }

.game-glossary { border-top: 2px solid var(--ink); }
.glossary-grid { display: grid; grid-template-columns: repeat(2,1fr); }
.glossary-grid article { border: 1px solid var(--line); padding: 24px; }
.glossary-grid h3 { font-size: 1.35rem; }
.glossary-grid p { color: var(--ink-soft); line-height: 1.6; margin-top: 8px; }

@keyframes flowPulse { 0%,100% { opacity:.36; stroke-width:3; } 50% { opacity:1; stroke-width:7; } }

@media (max-width: 900px) {
  .game-intro, .game-glossary, .game-workspace { grid-template-columns: 1fr; }
  .gridscape-titlebar { align-items: start; flex-direction: column; }
  .control-panel { max-width: 680px; }
}

@media (max-width: 640px) {
  .game-hud { grid-template-columns: repeat(2,1fr); }
  .game-hud div:nth-child(3) { border-left: 0; border-top: 1px solid rgba(255,255,255,.2); }
  .game-hud div:nth-child(4) { border-top: 1px solid rgba(255,255,255,.2); }
  .grid-node { height: 58px; width: 58px; }
  .grid-node b { font-size: 1rem; }
  .grid-node span { font-size: .48rem; }
  .result-metrics, .glossary-grid { grid-template-columns: 1fr; }
  .result-metrics div + div { border-left: 0; border-top: 1px solid rgba(255,255,255,.2); }
  .game-message { align-items: start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) { .grid-links line.active { animation: none; } }