:root{--brand: #ff8c22;--brand-deep: #f27200;--bg: #ffffff;--bg-soft: #f6f7f9;--card: #ffffff;--line: #e8eaee;--text: #16181d;--text-sub: #5b616e;--text-meta: #8a9099;--shadow: 0 10px 30px rgba(22, 24, 29, .08)}@media(prefers-color-scheme:dark){:root{--bg: #0e0f12;--bg-soft: #14161a;--card: #17191e;--line: #262a31;--text: #f4f5f7;--text-sub: #a8adb8;--text-meta: #7d838f;--shadow: 0 10px 30px rgba(0, 0, 0, .45)}}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Source Han Sans SC,Noto Sans CJK SC,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}.wrap{max-width:720px;margin:0 auto;padding:28px 20px 8px}.brand{display:flex;align-items:center;gap:12px;margin-bottom:34px}.brand-icon{width:56px;height:56px;border-radius:16px;box-shadow:var(--shadow)}.brand-text{display:flex;flex-direction:column;line-height:1.25}.brand-name{font-size:21px;font-weight:700;letter-spacing:.5px}.brand-tag{font-size:13px;color:var(--text-meta)}.hero h1{margin:0 0 14px;font-size:clamp(26px,6.4vw,36px);line-height:1.28;font-weight:800;letter-spacing:-.4px}.sub{margin:0 0 28px;font-size:15.5px;color:var(--text-sub)}.cta-row{display:flex;flex-direction:column;gap:12px}.btn-download{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:56px;border-radius:16px;background:linear-gradient(180deg,var(--brand) 0%,var(--brand-deep) 100%);color:#fff;font-size:17px;font-weight:700;text-decoration:none;box-shadow:0 8px 22px #ff8c2252;transition:transform .12s ease,box-shadow .12s ease}.btn-download:active{transform:scale(.985);box-shadow:0 4px 14px #ff8c2247}.cta-meta{display:flex;align-items:center;justify-content:center;gap:8px;font-size:13px;color:var(--text-meta)}.cta-meta .dot{opacity:.6}.qr-card{display:flex;align-items:center;gap:16px;margin-top:26px;padding:16px;border:1px solid var(--line);border-radius:18px;background:var(--card)}.qr-card img{width:108px;height:108px;border-radius:12px;background:#fff;padding:6px}.qr-text{display:flex;flex-direction:column;gap:6px}.qr-text strong{font-size:15.5px}.qr-text span{font-size:13px;color:var(--text-sub)}.steps{display:flex;flex-direction:column;gap:14px;margin:34px 0 6px}.step{display:flex;gap:14px;align-items:flex-start;padding:16px;border-radius:16px;background:var(--bg-soft)}.step-no{flex:0 0 26px;width:26px;height:26px;border-radius:50%;background:var(--brand);color:#fff;font-size:14px;font-weight:700;display:flex;align-items:center;justify-content:center;margin-top:1px}.step strong{display:block;font-size:15.5px;margin-bottom:2px}.step span{font-size:13.5px;color:var(--text-sub)}.features{display:grid;grid-template-columns:1fr;gap:12px;margin:30px 0 6px}.feat{padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--card)}.feat h3{margin:0 0 6px;font-size:16px;font-weight:700}.feat p{margin:0;font-size:13.5px;color:var(--text-sub)}.note{margin:26px 0 8px;padding:14px 16px;border-radius:14px;background:var(--bg-soft);font-size:13px;color:var(--text-sub)}.foot{border-top:1px solid var(--line);margin-top:34px;padding:22px 20px 30px}.foot-inner{max-width:720px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:6px 10px;font-size:12.5px;color:var(--text-meta)}.foot-links{margin-top:10px}.foot a{color:var(--text-meta);text-decoration:none}.foot a:hover{color:var(--brand)}.sep{opacity:.5}@media(max-width:639px){.qr-card{display:none}}@media(min-width:640px){.wrap{padding-top:44px}.cta-row{flex-direction:row;align-items:center;gap:18px}.btn-download{padding:0 34px}.features{grid-template-columns:1fr 1fr}}