:root{--bg:#f4f8fb;--surface:#ffffff;--ink:#143044;--muted:#4a6678;--accent:#0d7ea8;--accent-dark:#0a5f80;--accent-2:#e8913a;--accent-2-dark:#c9731f;--border:#d5e3ec;--disclaimer:#6b7c88;--radius:14px;--shadow:0 10px 30px rgba(20,48,68,0.08);--max:760px}*,:after,:before{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,PingFang SC,Noto Sans SC,Microsoft YaHei,sans-serif;color:var(--ink);background:radial-gradient(1200px 400px at 10% -10%,#d9f0fa 0,transparent 60%),radial-gradient(900px 360px at 100% 0,#ffe8cc 0,transparent 55%),var(--bg);line-height:1.65;min-height:100vh}a{color:var(--accent);text-decoration-thickness:1.5px;text-underline-offset:2px}a:hover{color:var(--accent-dark)}.container{width:min(100% - 2rem,var(--max));margin-inline:auto}.site-header{position:sticky;top:0;z-index:20;backdrop-filter:blur(10px);background:rgba(244,248,251,.88);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem 0}.logo{font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-.02em;white-space:nowrap}.nav{display:flex;flex-wrap:wrap;gap:.75rem 1rem;align-items:center;font-size:.95rem}.nav a{color:var(--muted);text-decoration:none;font-weight:600}.nav a:hover{color:var(--accent)}.lang-switch{padding:.25rem .65rem;border:1px solid var(--border);border-radius:999px;background:var(--surface)}.hero{padding:2.5rem 0 1rem}.hero h1{font-size:clamp(1.7rem,4.5vw,2.4rem);line-height:1.2;letter-spacing:-.03em;margin:0 0 1rem}.hero p,section p{color:var(--ink);margin:0 0 1rem}h2{font-size:clamp(1.25rem,3vw,1.55rem);letter-spacing:-.02em;margin:2.25rem 0 .85rem}h3{font-size:1.05rem;margin:1.25rem 0 .4rem}.cta-row{display:flex;flex-wrap:wrap;gap:.75rem;margin:1.25rem 0 .85rem}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.15rem;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid transparent;transition:transform .15s ease,background .15s ease,color .15s ease}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-dark);color:#fff}.btn-secondary{background:#fff7ee;color:var(--accent-2-dark);border-color:#f3d2ad}.btn-secondary:hover{background:#ffefd9;color:var(--accent-2-dark)}.disclaimer{color:var(--disclaimer);font-size:.875rem;margin:.5rem 0 0}.inline-disclaimer{max-width:42rem}.play-area{margin:1.5rem 0 .5rem}.play-canvas{background:linear-gradient(160deg,#0b3a4f,#13627f 55%,#1d89a8);border-radius:var(--radius);box-shadow:var(--shadow);min-height:220px;display:grid;place-items:center;color:#eaf7ff;border:1px solid rgba(255,255,255,.12)}.play-canvas-inner{text-align:center;padding:1.5rem}.play-emoji{display:block;font-size:2.2rem;margin-bottom:.4rem}.play-canvas strong{display:block;font-size:1.2rem;margin-bottom:.35rem}.play-canvas p{margin:0;color:#cde8f4;font-size:.95rem}.act-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;margin:.85rem 0;box-shadow:0 4px 14px rgba(20,48,68,.04)}.act-card h3{margin-top:0}.act-card p{margin-bottom:0}.how-steps,.why-list{padding-left:1.2rem;margin:0 0 1rem}.how-steps li,.why-list li{margin:.55rem 0}.faq{margin-bottom:2.5rem}.faq-list{margin:0}.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1rem 1.1rem;margin:.75rem 0}.faq-item dt{font-weight:700;margin-bottom:.35rem}.faq-item dd{margin:0;color:var(--muted)}.site-footer{margin-top:2rem;border-top:1px solid var(--border);background:rgba(255,255,255,.7);padding:1.5rem 0 2rem}.footer-inner{display:grid;gap:.85rem}.footer-links{display:flex;flex-wrap:wrap;gap:.75rem 1.1rem;font-size:.95rem}.footer-links a{color:var(--muted);text-decoration:none;font-weight:600}.footer-links a:hover{color:var(--accent)}@media (max-width:560px){.header-inner{flex-direction:column;align-items:flex-start}.btn{width:100%}.play-canvas{min-height:180px}}