:root{--bg: #0f1220;--panel: #1a1f35;--panel-2: #232a48;--text: #e8eaf6;--dim: #9aa0b5;--accent: #ffd166;--green: #9ee0a3;--red: #e0a0a8;--blue: #7eb6ff;--cell: #262d4d;--cell-border: #333c66}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,sans-serif;min-height:100vh}#app{max-width:560px;margin:0 auto;padding:12px 12px 40px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 4px 12px;flex-wrap:wrap}.brand-name{font-weight:800;font-size:18px;color:var(--accent)}.badge{font-size:10px;color:var(--green);border:1px solid rgba(158,224,163,.4);border-radius:999px;padding:2px 8px;white-space:nowrap}.top-actions{display:flex;gap:6px}.btn{background:var(--panel-2);color:var(--text);border:1px solid var(--cell-border);border-radius:10px;padding:8px 14px;font-size:14px;cursor:pointer;transition:filter .15s}.btn:hover{filter:brightness(1.15)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:#3d5afe;border-color:#3d5afe;font-weight:700}.btn-ghost{background:transparent}.btn-small{padding:5px 10px;font-size:12px}.btn.danger{color:var(--red);border-color:#e0a0a880}.gate{min-height:70vh;display:flex;align-items:center;justify-content:center}.gate-card{background:var(--panel);border:1px solid var(--cell-border);border-radius:16px;padding:24px;max-width:420px;display:flex;flex-direction:column;gap:14px}.gate-title{font-size:20px;color:var(--accent)}.gate-body{font-size:13px;color:var(--dim);line-height:1.6}.gate-confirm{display:flex;gap:8px;align-items:flex-start;font-size:13px;color:var(--text);line-height:1.4}.gate-confirm input{margin-top:3px}.screen{padding-top:8px}.page-title{font-size:20px;margin-bottom:6px}.page-sub{font-size:13px;color:var(--dim);margin-bottom:16px;line-height:1.5}.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.level-card{background:var(--panel);border:1px solid var(--cell-border);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:4px;cursor:pointer;text-align:left}.level-card:hover{filter:brightness(1.12)}.level-card.locked{opacity:.4;cursor:not-allowed}.level-id{font-weight:800;color:var(--accent);font-size:14px}.level-size{font-size:13px;font-weight:700}.level-mines{font-size:12px;color:var(--dim)}.level-best{font-size:11px;color:var(--dim)}.hud{display:flex;justify-content:space-between;gap:8px;margin-bottom:10px;font-size:13px;color:var(--dim)}.hud-item{background:var(--panel);border-radius:8px;padding:6px 10px}.mine-grid{display:grid;gap:3px;background:var(--panel);border:1px solid var(--cell-border);border-radius:12px;padding:8px}.cell{aspect-ratio:1;border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:800;-webkit-user-select:none;user-select:none;cursor:pointer}.cell.unknown{background:var(--cell);border:1px solid var(--cell-border)}.cell.unknown:hover{filter:brightness(1.2)}.cell.visited{background:#10152b;border:1px solid #1c2340}.cell.goal{background:#3d5afe40;border:1px solid #3d5afe}.cell.hero{background:#ffd1662e;border:1px solid var(--accent)}.cell .num-1,.cell.num-1{color:var(--blue)}.cell.num-2{color:var(--green)}.cell.num-3{color:var(--red)}.cell.num-4{color:#c792ea}.cell.num-5{color:#ffab70}.cell.num-6{color:#7ee0c0}.cell.num-7{color:#f0f0f0}.cell.num-8{color:#b0b7d0}.help{font-size:12px;color:var(--dim);margin-top:10px;text-align:center}.seed{font-size:10px;color:#666f8f;margin-top:6px;text-align:center;word-break:break-all}.footer{margin-top:20px;text-align:center;font-size:11px;color:#666f8f}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}.modal{background:var(--panel);border:1px solid var(--cell-border);border-radius:16px;padding:22px;width:100%;max-width:360px;display:flex;flex-direction:column;gap:12px}.modal-title{font-size:18px;color:var(--accent)}.row{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:14px}.end-panel{text-align:center}.end-title{font-size:22px}.end-panel.won .end-title{color:var(--green)}.end-panel.lost .end-title{color:var(--red)}.end-body{font-size:14px;color:var(--dim);line-height:1.5}.end-best{color:var(--accent);font-weight:800}.end-actions{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}.onboarding{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;display:flex;align-items:center;justify-content:center;z-index:200;padding:24px}.onboarding-card{background:var(--panel);border:1px solid var(--accent);border-radius:16px;padding:24px;max-width:340px;display:flex;flex-direction:column;gap:14px;text-align:center}.onboarding-step{font-size:12px;color:var(--dim)}.onboarding-body{font-size:15px;line-height:1.6}