*{box-sizing:border-box}
:root{
  --bg:#0b0f1a;--panel:#141b2d;--panel2:#101626;--line:rgba(255,255,255,.08);
  --text:#fff;--muted:#9fb0ca;--blue:#4da3ff;--green:#00e5a8;--yellow:#ffbf47;--red:#ff637d;
}
html,body{margin:0;padding:0;background:radial-gradient(circle at top,#15203a 0,#0b0f1a 55%);color:var(--text);font-family:Arial,Helvetica,sans-serif}
.app{max-width:1600px;margin:0 auto;padding:20px}
.topbar,.panel,.auth-card{background:rgba(20,27,45,.92);border:1px solid var(--line);border-radius:22px;box-shadow:0 20px 50px rgba(0,0,0,.28)}
.topbar{padding:18px 22px;display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:18px}
h1,h2,h3{margin:0 0 8px}
.sub{margin:0;color:var(--muted)}
.layout{display:grid;grid-template-columns:520px 1fr;gap:18px}
.panel{padding:18px}
.panel-title-row{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:14px}
.toolbar,.top-actions,.save-row,.stack-actions{display:flex;gap:10px;flex-wrap:wrap}
.badge,.mini-badge{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.05);color:var(--text);font-size:14px}
.mini-badge{font-size:12px}
label{display:block;margin:10px 0 6px;color:var(--muted);font-size:14px}
.input,textarea{width:100%;background:#0d1321;color:var(--text);border:1px solid var(--line);border-radius:14px;padding:12px 14px;outline:none}
textarea{min-height:240px;resize:vertical;font-family:Consolas,monospace;line-height:1.45}
.btn{appearance:none;border:0;border-radius:14px;padding:10px 14px;text-decoration:none;cursor:pointer;font-weight:700;display:inline-flex;align-items:center;justify-content:center}
.btn-primary{background:var(--blue);color:#08111d}.btn-success{background:var(--green);color:#07110e}.btn-danger{background:var(--red);color:#fff}
.btn-ghost{background:transparent;color:#fff;border:1px solid var(--line)}.full{width:100%}.small{padding:8px 10px;font-size:12px}
.builder-tabs{display:flex;gap:8px;margin:14px 0}
.tab{padding:10px 14px;border-radius:12px;background:transparent;border:1px solid var(--line);color:var(--text);cursor:pointer}
.tab.active{background:rgba(77,163,255,.14);border-color:rgba(77,163,255,.4)}
.hidden{display:none}
.block-palette{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.block-btn{appearance:none;border:0;border-radius:14px;padding:12px;cursor:pointer;color:#08111d;font-weight:800;text-align:left}
.block-btn.move{background:#71b5ff}.block-btn.turn{background:#8ce5c5}.block-btn.wait{background:#ffd987}
.block-stack{margin-top:12px;min-height:180px;background:#0d1321;border:1px dashed rgba(255,255,255,.16);border-radius:18px;padding:12px;display:grid;gap:10px}
.stack-block{display:grid;grid-template-columns:1fr 120px auto auto auto;gap:8px;align-items:center;padding:10px 12px;border-radius:14px;color:#08111d;font-weight:700}
.stack-block.move{background:#71b5ff}.stack-block.turn{background:#8ce5c5}.stack-block.wait{background:#ffd987}
.stack-block input{width:100%;padding:8px 10px;border-radius:10px;border:1px solid rgba(0,0,0,.15);background:rgba(255,255,255,.85)}
.icon-btn{appearance:none;border:0;background:rgba(0,0,0,.12);border-radius:10px;padding:8px 10px;cursor:pointer;color:#08111d;font-weight:900}
.saved-list{display:grid;gap:10px;margin-top:10px}
.saved-item{background:var(--panel2);border:1px solid var(--line);border-radius:16px;padding:12px}
.saved-row{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.saved-meta{color:var(--muted);font-size:12px;margin-top:4px}
.brain-screen{background:linear-gradient(180deg,#111829 0,#0e1424 100%);border:1px solid var(--line);border-radius:20px;padding:16px}
.brain-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
.screen-title{font-weight:800}
.screen-status{font-size:12px;border:1px solid rgba(0,229,168,.35);background:rgba(0,229,168,.08);color:#9af8da;padding:6px 10px;border-radius:999px}
.stats-grid,.ports-grid,.telemetry-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.stat-card,.port-card,.telemetry-card{background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:16px;padding:12px}
.stat-card span{display:block;color:var(--muted);font-size:12px;margin-bottom:6px}
.sim-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.canvas-wrap{background:#0d1321;border:1px solid var(--line);border-radius:18px;padding:12px}
#arena{width:100%;height:auto;display:block;background:#10182a;border-radius:12px}
.console{margin-top:14px;background:#0a101b;border:1px solid var(--line);border-radius:18px;overflow:hidden}
.console-head{padding:10px 14px;color:var(--muted);background:rgba(255,255,255,.04)}
.console-body{min-height:120px;max-height:220px;overflow:auto;padding:14px;font-family:Consolas,monospace;font-size:13px}
.log{margin-bottom:6px}.log.ok{color:#9af8da}.log.err{color:#ff9fb1}
.auth-page{min-height:100vh;display:grid;place-items:center;padding:20px}
.auth-card{width:min(430px,calc(100vw - 30px));padding:28px}
.auth-card.wide{width:min(620px,calc(100vw - 30px))}
.auth-logo{font-size:42px}.alert{margin:12px 0;padding:12px;border-radius:12px;background:rgba(255,99,125,.12);border:1px solid rgba(255,99,125,.3)}
.success-box{margin:12px 0;padding:12px;border-radius:12px;background:rgba(0,229,168,.12);border:1px solid rgba(0,229,168,.3);color:#b8ffeb}
.demo-box{margin-top:14px;color:var(--muted);font-size:14px}
.checkline{display:flex;gap:8px;align-items:center;margin-top:12px}
@media (max-width:1250px){.layout{grid-template-columns:1fr}}
@media (max-width:900px){.stats-grid,.ports-grid,.telemetry-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:600px){.block-palette,.stats-grid,.ports-grid,.telemetry-grid{grid-template-columns:1fr}.stack-block{grid-template-columns:1fr}}