*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#f4f6fa;--bg-white:#fff;--text:#1e2a3a;--text-secondary:#5f6d7e;--text-muted:#9aa5b4;--border:#e5e9f0;--aws-orange:#f90;--aws-orange-light:#fff4e0;--aws-dark:#232f3e;--success:#22c55e;--success-light:#dcfce7;--error:#ef4444;--error-light:#fee2e2;--blue:#3b82f6;--purple:#8b5cf6;--accent-border:#6366f1;--cat-compute:#f97316;--cat-storage:#22c55e;--cat-database:#3b82f6;--cat-networking:#f97316;--cat-security:#8b5cf6;--cat-analytics:#ec4899;--cat-integration:#f59e0b;--cat-observability:#14b8a6;--cat-devops:#e11d48;--cat-ml:#06b6d4;--cat-management:#84cc16}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.5}#root{flex-direction:column;min-height:100vh;display:flex}button{cursor:pointer;border:none;outline:none;font-family:inherit}.topbar{background:var(--bg-white);border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:14px 28px;display:flex}.topbar__challenge{align-items:center;gap:12px;display:flex}.topbar__pill{border:2px solid;border-radius:20px;align-items:center;padding:6px 16px;font-size:13px;font-weight:600;display:inline-flex}.topbar__pill--start{background:var(--aws-orange-light);border-color:var(--aws-orange);color:#b45309}.topbar__pill--target{background:var(--success-light);border-color:var(--success);color:#15803d}.topbar__arrow{color:var(--text-muted);font-size:16px}.topbar__stats{align-items:center;gap:20px;display:flex}.topbar__stat{color:var(--text-secondary);align-items:center;gap:6px;font-size:14px;display:flex}.topbar__stat-icon{opacity:.6;font-size:16px}.topbar__stat-value{color:var(--text);font-size:15px;font-weight:700}.nav-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:12px 28px;display:flex}.nav-row__back{color:var(--text-secondary);background:0 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32px;display:flex}.landing__title{color:var(--text);letter-spacing:-.5px;margin-top:16px;font-size:36px;font-weight:800}.landing__title--orange{color:var(--aws-orange)}.landing__subtitle{color:var(--text-muted);margin-top:4px;margin-bottom:28px;font-size:16px}.landing__desc{text-align:left;color:var(--text-secondary);background:var(--bg-white);border:1px solid var(--border);border-radius:12px;margin-bottom:28px;padding:20px 24px;font-size:15px;line-height:1.7}.landing__desc p+p{margin-top:10px}.landing__how{text-align:left;width:100%;margin-bottom:32px}.landing__how-title{color:var(--text);text-transform:uppercase;letter-spacing:.6px;margin-bottom:12px;font-size:14px;font-weight:700}.landing__steps{flex-direction:column;gap:8px;display:flex}.landing__step{background:var(--bg-white);border:1px solid var(--border);border-radius:10px;align-items:center;gap:12px;padding:12px 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var(--border)}.landing__btn--ghost:hover{background:var(--bg)}.landing__features{flex-wrap:wrap;justify-content:center;gap:20px;display:flex}.landing__feature{color:var(--text-muted);align-items:center;gap:6px;font-size:13px;font-weight:500;display:flex}.landing__feature-icon{font-size:16px}@media (width<=900px){.main-layout{flex-direction:column}.sidebar{border-left:none;border-top:1px solid var(--border);width:100%;min-width:0;max-height:400px}.topbar{padding:12px 16px}.game-area{padding:0 16px 16px}.nav-row{padding:10px 16px}}@media (width<=600px){.current-card__name{font-size:18px}.topbar__pill{padding:5px 12px;font-size:12px}}