.c4-app{
  --c4-bg:#2c3e6b;
  --c4-bg2:#1c274a;
  --c4-ink:#1a2038;
  --c4-panel:rgba(255,255,255,.94);
  --c4-line:rgba(26,32,56,.16);
  --c4-shadow:0 14px 40px rgba(0,10,30,.22);
  --c4-radius:22px;
  --c4-c1:#2d9cdb;
  --c4-c2:#eb5757;
  --c4-c3:#27ae60;
  --c4-c4:#f2c94c;
  --c4-error:#c0392b;
  --c4-transition:0.2s ease;
}
[data-theme="dark"] .c4-app{ --c4-panel:rgba(30,32,44,.94); --c4-ink:#eef1ee; --c4-line:rgba(238,241,238,.16); }
@media (prefers-color-scheme: dark) {
  .c4-app:not([data-theme="light"]){ --c4-panel:rgba(30,32,44,.94); --c4-ink:#eef1ee; --c4-line:rgba(238,241,238,.16); }
}
.c4-app *{box-sizing:border-box}
.c4-app{
  width:min(100%,760px);
  margin:0 auto;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  background:linear-gradient(160deg,var(--c4-bg),var(--c4-bg2));
  color:var(--c4-ink);
  border-radius:28px;
  box-shadow:var(--c4-shadow);
  padding:14px 16px 18px;
}
.c4-app button{font:inherit}
.c4-app .top{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#fff;margin:2px 2px 10px}
.c4-app .brand h1{margin:0;font-size:clamp(1.4rem,5.5vw,2.2rem);letter-spacing:-.03em}
.c4-app .hud{display:flex;gap:8px;align-items:center}
.c4-app .iconBtn{width:42px;height:42px;border-radius:999px;border:1px solid rgba(255,255,255,.38);background:rgba(255,255,255,.18);color:#fff;font-weight:950;font-size:1.1rem;cursor:pointer;display:grid;place-items:center;backdrop-filter:blur(8px);transition:background var(--c4-transition)}
.c4-app .iconBtn:hover{background:rgba(255,255,255,.28)}
.c4-app .iconBtn:focus-visible{outline:2px solid #fff;outline-offset:2px}

.c4-app .panel{background:var(--c4-panel);border:1px solid rgba(255,255,255,.6);border-radius:var(--c4-radius);box-shadow:var(--c4-shadow);padding:12px}

.c4-app .settings-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:4px}
.c4-app .settings-row label{font-weight:800;font-size:.9rem}
.c4-app .settings-row input[type=number]{width:70px;min-height:40px;border-radius:12px;border:1px solid var(--c4-line);padding:6px 10px;font:inherit;font-weight:800;text-align:center}
.c4-app .settings-row input[type=number]:focus-visible{outline:2px solid var(--c4-c1);outline-offset:1px}
.c4-app .checkbox-label{display:flex;align-items:center;gap:8px;cursor:pointer}
.c4-app .checkbox-label input[type=checkbox]{width:20px;height:20px;accent-color:var(--c4-c1);cursor:pointer}
.c4-app .checkbox-label input[type=checkbox]:focus-visible{outline:2px solid var(--c4-c1);outline-offset:2px}
.c4-app .settings-note{font-size:.76rem;opacity:.7;line-height:1.3;margin:0 0 8px}

.c4-app .info{margin:0 0 6px;font-size:.8rem}
.c4-app .info-line{margin:0 0 2px}
.c4-app .info code{background:var(--c4-line);border-radius:6px;padding:1px 6px;font-size:.9em}

.c4-app .map-wrap{position:relative;display:grid;place-items:center;min-height:160px}
.c4-app svg{width:100%;height:auto;display:block;overflow:visible}
.c4-app .region{stroke:#1a1a2e;stroke-width:2;stroke-linejoin:round;cursor:pointer;transition:filter .15s ease,fill .15s ease}
.c4-app .region:hover{filter:brightness(1.06)}
.c4-app .region:focus-visible{outline:3px solid #17202a;outline-offset:-3px}
.c4-app .region.uncolored{fill:#dde1e7}
.c4-app .region.color-0{fill:var(--c4-c1)}
.c4-app .region.color-1{fill:var(--c4-c2)}
.c4-app .region.color-2{fill:var(--c4-c3)}
.c4-app .region.color-3{fill:var(--c4-c4)}
.c4-app .region.locked{cursor:default;stroke:#1a1a2e;stroke-width:2;stroke-dasharray:4 3}
.c4-app .region.conflict{stroke:var(--c4-error);stroke-width:5;animation:c4-pulse 1s ease-in-out infinite}
@keyframes c4-pulse{0%,100%{opacity:.7}50%{opacity:1}}

.c4-app .palette{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}
.c4-app .swatch{min-height:46px;border:none;border-radius:16px;cursor:pointer;box-shadow:inset 0 0 0 2px rgba(0,0,0,.08);position:relative;transition:transform .12s ease,box-shadow .12s ease}
.c4-app .swatch:hover{transform:translateY(-1px)}
.c4-app .swatch:focus-visible{outline:3px solid var(--c4-ink);outline-offset:2px}
.c4-app .swatch.selected{box-shadow:0 0 0 4px #fff,0 0 0 7px rgba(26,32,56,.9)}
.c4-app .swatch[data-color="0"]{background:var(--c4-c1)}
.c4-app .swatch[data-color="1"]{background:var(--c4-c2)}
.c4-app .swatch[data-color="2"]{background:var(--c4-c3)}
.c4-app .swatch[data-color="3"]{background:var(--c4-c4)}

.c4-app .controls{display:grid;grid-template-columns:1fr 1fr 1fr;gap:8px;margin-top:10px}
.c4-app .ctrl{border:none;border-radius:16px;min-height:46px;padding:8px 12px;font-weight:850;cursor:pointer;background:#ffffff;color:#1a2038;box-shadow:inset 0 0 0 1px var(--c4-line);transition:filter var(--c4-transition)}
.c4-app .ctrl:disabled{opacity:.55;cursor:default}
.c4-app .ctrl:hover:not(:disabled){filter:brightness(0.97)}
.c4-app .ctrl:focus-visible{outline:2px solid #1a2038;outline-offset:2px}
.c4-app .ctrl.primary{background:#1a2038;color:#ffffff}

.c4-app .legend{display:flex;align-items:center;gap:8px;font-size:.74rem;opacity:.75;margin:8px 0 0;line-height:1.3}
.c4-app .legend[hidden]{display:none}
.c4-app .swatch-mini{width:16px;height:16px;border-radius:4px;flex:none;background:#dde1e7;border:2px dashed #1a1a2e}

.c4-app .status{margin-top:6px;min-height:1.3em;font-weight:800;font-size:.84rem;text-align:center}
.c4-app .status.error{color:var(--c4-error)}
.c4-app .status.success{color:#1e824c}

.c4-app .modalBackdrop{position:fixed;inset:0;background:rgba(10,15,30,.55);display:none;align-items:center;justify-content:center;padding:20px;z-index:20}
.c4-app .modalBackdrop.show{display:flex}
.c4-app .modal{background:#fff;border-radius:20px;max-width:440px;width:100%;padding:22px;box-shadow:var(--c4-shadow);text-align:center;color:#1a2038}
.c4-app .modal h2{margin:0 0 12px;font-size:1.3rem}
.c4-app .modal p{line-height:1.5;margin:0 0 14px}
.c4-app .modal a{color:var(--c4-c1)}
.c4-app .modalBtn{border:none;border-radius:14px;min-height:48px;padding:10px 18px;font-weight:900;cursor:pointer;background:#1a2038;color:#fff;width:100%}
.c4-app .modalBtn:focus-visible{outline:2px solid var(--c4-c1);outline-offset:2px}

@media(prefers-reduced-motion:reduce){.c4-app *,.c4-app *::before,.c4-app *::after{animation:none!important;transition:none!important}}
@media(max-width:600px){
  .c4-app{padding:10px 10px 14px;border-radius:18px}
  .c4-app .map-wrap{min-height:220px}
  .c4-app .controls{grid-template-columns:1fr 1fr}
  .c4-app .controls .ctrl.primary{grid-column:1 / -1}
}