:root {
  color-scheme: dark;
  --ink: #eaf8ff;
  --muted: #91afbf;
  --navy: #071a2b;
  --panel: rgba(9, 34, 52, .84);
  --line: rgba(147, 216, 230, .18);
  --cyan: #65e6dc;
  --green: #7ee787;
  --gold: #ffd166;
  --purple: #c792ff;
  --blue: #59c3ff;
  --red: #ff6b6b;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 5%, rgba(35, 164, 170, .18), transparent 34rem),
    radial-gradient(circle at 95% 80%, rgba(90, 78, 184, .16), transparent 30rem),
    var(--navy);
}
button { font: inherit; color: inherit; }
button:focus-visible { outline: 3px solid var(--cyan); outline-offset: 3px; }
.shell { width: min(1500px, 96vw); margin: 0 auto; padding: 22px 0 30px; }
.topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: clamp(1.4rem, 3vw, 2.15rem); letter-spacing: -.04em; }
h2 { letter-spacing: -.035em; }
.eyebrow { margin-bottom: 5px; color: var(--cyan); font-size: .72rem; font-weight: 800; letter-spacing: .15em; text-transform: uppercase; }
.panel { border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: 0 22px 70px rgba(0,0,0,.22); backdrop-filter: blur(14px); }
.hidden { display: none !important; }
button { border: 1px solid var(--line); border-radius: 12px; padding: 10px 15px; background: rgba(255,255,255,.055); cursor: pointer; transition: .18s ease; }
button:hover { transform: translateY(-1px); background: rgba(255,255,255,.1); }
button.primary { border-color: transparent; color: #052229; font-weight: 850; background: linear-gradient(135deg, #72efe2, #60bdf7); box-shadow: 0 8px 24px rgba(70, 214, 215, .2); }
.top-actions { display: flex; gap: 8px; }
.icon-btn { color: var(--muted); }
.menu-panel { min-height: 620px; display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; overflow: hidden; }
.hero-copy { padding: clamp(32px, 5vw, 76px); }
.hero-copy h2 { max-width: 650px; margin: 18px 0; font-size: clamp(2.6rem, 6vw, 5.6rem); line-height: .93; }
.hero-copy > p { max-width: 600px; color: var(--muted); font-size: 1.12rem; line-height: 1.7; }
.mission-tag { display: inline-flex; padding: 7px 11px; border-radius: 99px; color: var(--cyan); background: rgba(101,230,220,.11); font-size: .72rem; font-weight: 850; letter-spacing: .11em; text-transform: uppercase; }
.bilayer-preview { position: relative; height: 100%; min-height: 620px; overflow: hidden; background: linear-gradient(rgba(23,84,111,.2), rgba(10,34,50,.2)); }
.preview-row { position: absolute; left: -3%; right: -3%; height: 43px; background: radial-gradient(circle, #9ae8e0 0 9px, transparent 10px) 0 0/44px 43px; }
.preview-row:first-of-type { top: 42%; }
.preview-row:nth-of-type(3) { top: 57%; }
.preview-tails { position:absolute; left:0; right:0; top:45%; height:17%; background: repeating-linear-gradient(90deg, transparent 0 17px, rgba(110,199,194,.55) 18px 20px, transparent 21px 27px, rgba(110,199,194,.55) 28px 30px, transparent 31px 44px); }
.preview-unit { position:absolute; top:44%; width:20px; height:100px; border-radius:8px; filter: drop-shadow(0 0 14px currentColor); animation: drift 7s ease-in-out infinite alternate; }
.preview-unit.gold { left:24%; color:var(--gold); background:var(--gold); }
.preview-unit.purple { left:52%; top:39%; height:145px; color:var(--purple); background:var(--purple); }
.preview-unit.blue { left:76%; color:var(--blue); background:var(--blue); }
.preview-molecule { position:absolute; width:46px; height:46px; display:grid; place-items:center; border-radius:50%; font-weight:900; animation: float 3s ease-in-out infinite; }
.preview-molecule.virus { top:18%; left:47%; color:#ffe0e0; border:3px dashed var(--red); background:rgba(255,107,107,.2); }
.preview-molecule.nutrient { top:24%; left:74%; color:#d9ffe1; background:rgba(126,231,135,.2); }
@keyframes drift { to { transform: translateX(55px); } }
@keyframes float { 50% { transform:translateY(18px); } }
#levelSelect { padding: 38px; }
.section-heading h2 { font-size:2.2rem; }
.level-grid { display:grid; grid-template-columns:repeat(5,1fr); gap:14px; }
.level-card { min-height:280px; display:flex; flex-direction:column; align-items:flex-start; text-align:left; padding:22px; border-radius:18px; }
.level-card .num { width:38px; height:38px; display:grid; place-items:center; margin-bottom:32px; border-radius:50%; color:var(--cyan); background:rgba(101,230,220,.1); font-weight:900; }
.level-card h3 { margin:0 0 9px; font-size:1.18rem; }
.level-card p { color:var(--muted); line-height:1.45; font-size:.9rem; }
.level-card .card-stars { margin-top:auto; color:var(--gold); letter-spacing:3px; }
.game-layout { display:grid; grid-template-columns:minmax(0,1fr) 280px; gap:14px; }
.hud { grid-column:1/-1; display:grid; grid-template-columns:1fr auto auto minmax(200px,350px); gap:30px; align-items:center; padding:16px 22px; }
.hud h2 { margin:0; font-size:1.15rem; }
.hud-stat { display:flex; flex-direction:column; text-align:right; }
.hud-stat span, .integrity-label span { color:var(--muted); font-size:.7rem; text-transform:uppercase; letter-spacing:.09em; }
.hud-stat strong { font-size:1.35rem; }
.integrity-label { display:flex; justify-content:space-between; margin-bottom:6px; }
.meter { height:10px; overflow:hidden; border-radius:10px; background:rgba(255,255,255,.08); }
#integrityBar { width:100%; height:100%; border-radius:inherit; background:linear-gradient(90deg,var(--green),var(--cyan)); transition:.25s; }
.game-stage { position:relative; min-width:0; overflow:hidden; }
canvas { display:block; width:100%; height:auto; touch-action:none; }
.control-panel { display:flex; flex-direction:column; gap:21px; padding:20px; }
.objective { color:#d6edf5; line-height:1.45; }
.inventory { display:grid; gap:8px; }
.inventory button { display:grid; grid-template-columns:24px 1fr auto; align-items:center; gap:8px; text-align:left; padding:11px; }
.inventory button.selected { border-color:var(--cyan); background:rgba(101,230,220,.13); }
.unit-swatch { width:16px; height:28px; border-radius:5px; }
.phase-block, .progress-stats { padding:12px; border-radius:12px; background:rgba(255,255,255,.045); }
.phase-block span { display:block; color:var(--muted); font-size:.72rem; text-transform:uppercase; }
.progress-stats { display:grid; gap:7px; color:var(--muted); font-size:.85rem; }
.progress-stats div { display:flex; justify-content:space-between; gap:10px; }
.progress-stats strong { color:var(--ink); }
.help { margin-top:auto; color:var(--muted); font-size:.78rem; line-height:1.45; }
.help p { margin-bottom:7px; }
.aside-actions { display:grid; grid-template-columns:1fr 1fr; gap:8px; }
.overlay { position:absolute; inset:0; display:grid; place-items:center; text-align:center; background:rgba(4,17,28,.82); backdrop-filter:blur(5px); z-index:4; }
.toast { position:absolute; left:50%; top:18px; transform:translateX(-50%); z-index:3; padding:9px 14px; border:1px solid var(--line); border-radius:99px; background:rgba(3,18,28,.92); font-weight:800; pointer-events:none; }
.toast.good { color:var(--green); }.toast.bad { color:#ff9e9e; }.toast.warn { color:var(--gold); }
.modal { position:fixed; inset:0; z-index:10; display:grid; place-items:center; padding:20px; background:rgba(2,12,20,.82); backdrop-filter:blur(12px); }
.modal-card { width:min(560px,95vw); padding:38px; border:1px solid var(--line); border-radius:24px; background:#0b2638; box-shadow:0 30px 90px rgba(0,0,0,.5); }
.modal-card h2 { margin:18px 0 10px; font-size:2.25rem; }
.concept { color:var(--muted); line-height:1.6; }
.briefing-rule, .learned { margin:25px 0; padding-top:20px; border-top:1px solid var(--line); }
.briefing-rule p, .learned p { margin:7px 0 0; color:#cae1ea; line-height:1.5; }
.stars { margin:12px 0 22px; color:var(--gold); font-size:2.3rem; letter-spacing:8px; }
.result-stats { display:grid; grid-template-columns:1fr 1fr; gap:10px; }
.result-stats div { padding:12px; border-radius:12px; background:rgba(255,255,255,.045); }
.result-stats span { display:block; color:var(--muted); font-size:.72rem; text-transform:uppercase; }
.result-stats strong { font-size:1.25rem; }
.result-actions { display:flex; justify-content:flex-end; gap:8px; }
@media (max-width:1000px) {
  .menu-panel { grid-template-columns:1fr; }.bilayer-preview { display:none; }
  .level-grid { grid-template-columns:repeat(2,1fr); }
  .game-layout { grid-template-columns:1fr; }.control-panel { display:grid; grid-template-columns:repeat(2,1fr); }.hud { grid-template-columns:1fr auto auto; }.integrity-wrap { grid-column:1/-1; }
}
@media (max-width:620px) {
  .shell { width:100%; padding:10px; }.topbar { padding:4px; }.topbar .eyebrow { display:none; }
  .menu-panel { min-height:520px; }.hero-copy { padding:28px 22px; }.hero-copy h2 { font-size:3.25rem; }
  #levelSelect { padding:20px; }.level-grid { grid-template-columns:1fr; }.level-card { min-height:205px; }
  .hud { gap:12px; padding:12px; }.hud-stat strong { font-size:1rem; }.hud h2 { font-size:1rem; }
  .control-panel { grid-template-columns:1fr; }.modal-card { padding:26px; }
}

/* Site integration and small-screen controls. */
.marsnut-nav{width:min(1500px,96vw);margin:16px auto;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 16px;border-radius:16px;background:#f5f2e9;color:#273d35}.marsnut-nav a{color:inherit;text-decoration:none;font-weight:700}.marsnut-nav img{display:block;max-width:100%;height:auto}.home{padding:10px 16px;border:1px solid #273d35;border-radius:24px}
.bilayer-preview{min-height:500px;display:flex;align-items:center;justify-content:center}.game-cover{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:1}.menu-panel{min-height:500px}.hero-copy h2{font-size:clamp(2.4rem,4.8vw,4.5rem)}.session-note{font-size:14px!important;color:var(--cyan)!important}.topbar{gap:18px;flex-wrap:wrap}.top-actions{flex-wrap:wrap}button{min-height:44px}.modal{overflow:auto;align-items:safe center}.modal-card{max-height:calc(100dvh - 40px);overflow:auto}.toast{max-width:90%;width:max-content;text-align:center;font-size:clamp(11px,2.5vw,15px)}
dialog{width:min(640px,calc(100% - 24px));max-height:85dvh;overflow:auto;border:1px solid var(--line);border-radius:20px;padding:24px;background:#0b2638;color:var(--ink);line-height:1.6}dialog::backdrop{background:#02121dcc}dialog h2{margin:0 0 16px}dialog li{margin-bottom:10px}
.about,footer.wrap{width:min(1280px,calc(100% - 32px));margin:24px auto;padding:24px 16px;background:#f5f2e9;color:#273d35;border-radius:16px;display:flex;align-items:center;gap:22px;flex-wrap:wrap}.about p{flex:1;min-width:200px;line-height:1.6;font-size:14px;margin:0}.about-star{font-size:36px;color:#df592f}.device-note{font-size:11px;line-height:1.8}footer.wrap{font-size:13px}footer a{color:inherit}.footer-meta{margin-left:auto;font-size:12px;overflow-wrap:anywhere}
@media(max-width:620px){.hero-copy h2{font-size:2.7rem}.menu-panel{min-height:400px}.bilayer-preview{display:flex;min-height:210px}.game-cover{object-fit:contain}.top-actions{width:100%}.top-actions button{flex:1;padding:10px 8px}.control-panel{gap:12px}.footer-meta{width:100%;margin-left:0}.about p br{display:none}.modal-card h2{font-size:1.8rem}.hud{grid-template-columns:minmax(0,1fr) auto auto}#levelSelect{padding:16px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}