:root{--teal:#0d9488;--teal2:#0f766e;--bg:#eef7f4;--card:#fff;--danger:#dc2626}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:#0f172a}
a{color:var(--teal2);text-decoration:none}
.wrap{max-width:420px;margin:0 auto;padding:10px 12px 32px}
.top{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.back{width:36px;height:36px;border-radius:50%;background:#fff;display:grid;place-items:center;box-shadow:0 1px 3px rgba(0,0,0,.08);font-size:18px}
h1{font-size:1.12rem;margin:0}
.sub{font-size:.84rem;color:#64748b;margin-top:2px}
.stage{background:#0b3d36;border-radius:18px;overflow:hidden;box-shadow:0 8px 24px rgba(15,61,54,.25)}
.canvas{position:relative;height:min(52vh,420px);background:linear-gradient(#166534 0 10%,#1e293b 10% 90%,#166534 90% 100%)}
.road{position:absolute;left:50%;top:0;bottom:0;width:44%;transform:translateX(-50%);background:#1e293b}
.edge-l,.edge-r{position:absolute;top:0;bottom:0;width:9px;background:repeating-linear-gradient(#ef4444 0 12px,#fff 12px 24px)}
.edge-l{left:0}.edge-r{right:0}
.center{position:absolute;left:50%;top:10%;bottom:10%;border-left:2px dashed rgba(255,255,255,.22);transform:translateX(-50%)}
.mark{position:absolute;left:10%;right:10%;height:4px;background:#fff;border-radius:2px;top:46%}
.mark-label{position:absolute;left:50%;top:48%;transform:translateX(-50%);background:#fff;color:#0f172a;font-size:10px;font-weight:700;padding:2px 7px;border-radius:6px;z-index:2;white-space:nowrap}
.car{position:absolute;left:50%;width:48px;height:84px;transform:translateX(-50%);bottom:10%;transition:bottom 1s cubic-bezier(.4,0,.2,1),left .9s ease;z-index:3}
.car.pos0{bottom:10%}.car.pos1{bottom:42%}.car.pos2{bottom:72%}
.car-body{width:100%;height:100%;background:linear-gradient(180deg,#fbbf24,#f59e0b);border-radius:11px;border:2px solid #b45309;position:relative;box-shadow:0 4px 12px rgba(0,0,0,.35)}
.car-body::before{content:"";position:absolute;left:7px;right:7px;top:12px;height:24px;background:rgba(30,58,138,.5);border-radius:7px}
.signal{position:absolute;left:3px;top:6px;width:9px;height:7px;border-radius:2px;background:#334155}
.signal.on{background:#22c55e;box-shadow:0 0 8px #22c55e;animation:blink .5s infinite}
@keyframes blink{50%{opacity:.35}}
.theme-slope .canvas{background:linear-gradient(#166534 0 8%,#334155 8% 35%,#1e293b 35% 90%,#166534 90%)}
.theme-z .mark{top:55%}.theme-park .road{width:55%}
.theme-cross .mark{top:40%}
.theme-s .center{border-left-style:solid;opacity:.4}
.hud{position:absolute;right:8px;top:10px;min-width:110px;background:rgba(15,23,42,.9);color:#fff;border-radius:12px;padding:8px;font-size:11px;z-index:5}
.hud .row{display:flex;justify-content:space-between;gap:8px;margin-bottom:4px}
.hud .on{color:#4ade80;font-weight:700}.hud .off{color:#94a3b8}
.step-bar{background:rgba(15,23,42,.95);color:#fff;padding:10px 12px;font-size:.88rem;min-height:42px}
.actions{display:flex;gap:8px;padding:10px;background:#0a2f2a}
.btn{border:0;border-radius:11px;padding:11px 14px;font-weight:700;cursor:pointer;font-size:.9rem}
.btn-main{flex:1;background:var(--teal);color:#fff}
.btn-ghost{background:#134e4a;color:#ecfdf5}
.btn:disabled{opacity:.5}
.sound-row{display:flex;gap:6px;flex-wrap:wrap;padding:8px 10px;background:#0d3530}
.sound-row button{border:0;background:#1e4d47;color:#ecfdf5;border-radius:8px;padding:6px 8px;font-size:11px;cursor:pointer}
.panel{margin-top:14px;background:var(--card);border-radius:14px;padding:14px;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.panel h2{font-size:.95rem;margin:0 0 10px}
.steps{list-style:none;padding:0;margin:0;counter-reset:s}
.steps li{counter-increment:s;position:relative;padding:9px 10px 9px 40px;background:#f8fafc;border-radius:10px;margin-bottom:7px;font-size:.86rem}
.steps li::before{content:counter(s);position:absolute;left:8px;top:9px;width:22px;height:22px;border-radius:50%;background:#ccfbf1;color:var(--teal2);display:grid;place-items:center;font-size:.75rem;font-weight:700}
.steps li.active{outline:2px solid var(--teal);background:#f0fdfa}
table{width:100%;border-collapse:collapse;font-size:.84rem}
th,td{text-align:left;padding:7px 8px;border-bottom:1px solid #e2e8f0}
th{background:#f1f5f9}
.loai{color:var(--danger);font-weight:700}
.tru{color:#d97706;font-weight:600}
.nav{display:flex;gap:8px;margin-top:16px}
.nav a{flex:1;text-align:center;background:#fff;padding:12px;border-radius:12px;font-weight:600;font-size:.88rem;box-shadow:0 1px 3px rgba(0,0,0,.06)}
.grid{display:grid;gap:10px}
.card{background:#fff;border-radius:14px;padding:14px 16px;box-shadow:0 1px 3px rgba(0,0,0,.06);display:block}
.card h2{font-size:1rem;margin:0 0 4px}
.card p{margin:0;font-size:.86rem;color:#64748b}
.card .go{display:inline-block;margin-top:8px;font-weight:700;color:var(--teal);font-size:.9rem}
.card.ready{border:1px solid #99f6e4}
.badge{display:inline-block;font-size:.72rem;font-weight:700;padding:3px 8px;border-radius:999px;background:#ccfbf1;color:var(--teal2)}
.hero{background:#fff;border-radius:14px;padding:14px 16px;margin-bottom:12px;box-shadow:0 1px 3px rgba(0,0,0,.06)}