:root{font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:#172033;background:#f6f8fc;font-synthesis:none;--blue:#245bea;--line:#e4e9f1;--muted:#66748a;--ease:cubic-bezier(.2,.7,.2,1)}
*{box-sizing:border-box}body{margin:0;font-size:14px;line-height:1.65}[hidden]{display:none!important}button{font:inherit;cursor:pointer}h1,h2,p{margin-top:0}h1{font-size:31px;line-height:1.35;letter-spacing:-.5px;margin-bottom:12px}h2{font-size:18px;margin-bottom:8px}button:disabled{opacity:.5;cursor:not-allowed;transform:none!important}button:focus-visible{outline:3px solid #bdd0ff;outline-offset:3px}.muted{color:var(--muted)}p.muted{margin-bottom:0}.icon-library{position:absolute;width:0;height:0;overflow:hidden}.icon{width:20px;height:20px;flex:none;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle}.site-header{height:88px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 max(28px,calc((100vw - 1120px)/2));gap:20px}.brand{display:flex;align-items:center;gap:12px}.brand-mark{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;color:#fff;background:var(--blue);font-size:23px;font-weight:700}.brand strong{display:block;font-size:17px}.brand small{display:block;color:var(--muted);font-size:12px}.header-label{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:12px}.header-label .icon{width:16px;height:16px}main{max-width:1176px;margin:auto;padding:42px 28px 24px}.eyebrow{font-size:12px;color:var(--blue);font-weight:600;letter-spacing:1px;margin-bottom:10px}.page-heading{margin:0 0 30px}.page-heading .muted{font-size:14px}.checkout-grid{display:grid;grid-template-columns:minmax(0,1fr) 305px;gap:22px;align-items:start}.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:28px}.card-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px}.card-heading h2{margin:0}.badge{padding:4px 9px;color:var(--blue);background:#edf3ff;border-radius:6px;font-size:11px;white-space:nowrap}.plans{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.plan{position:relative;border:1px solid var(--line);background:#fff;border-radius:12px;padding:20px;text-align:left;min-height:144px;transition:background .2s,border-color .2s,box-shadow .2s,transform .2s}.plan:hover{border-color:#91abe8;transform:translateY(-2px)}.plan:active{transform:scale(.985)}.plan[aria-checked=true]{border-color:var(--blue);background:#f7faff;box-shadow:0 0 0 1px var(--blue)}.plan-name{display:block;font-size:13px;color:#43536e;font-weight:600;margin-bottom:8px}.plan-price{display:block;font-size:29px;letter-spacing:-.5px;color:#172033;font-weight:650;line-height:1.35}.plan-unit{font-size:12px;font-weight:400;color:var(--muted);margin-left:5px}.plan-average{display:block;font-size:11px;color:var(--muted);margin-top:6px}.selection-mark{position:absolute;right:13px;top:15px;display:grid;place-items:center;width:17px;height:17px;border:1px solid #c7d0e0;border-radius:50%;transition:background .2s,border-color .2s,color .2s;color:transparent}.selection-mark .icon{width:11px;height:11px;stroke-width:2.5}.plan[aria-checked=true] .selection-mark{background:var(--blue);border-color:var(--blue);color:#fff}.terms{margin:24px 0;color:var(--muted);font-size:12px}.terms p{display:flex;gap:9px;align-items:flex-start;margin:10px 0}.terms .icon{width:15px;height:15px;margin-top:3px;color:var(--blue)}.purchase-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;border-top:1px solid #edf0f6;padding-top:22px}.purchase-footer>div{display:flex;flex-direction:column;gap:2px}.purchase-footer .muted{font-size:11px}.purchase-footer strong{font-size:26px;line-height:1.4;font-weight:650}.button{border:1px solid transparent;min-height:43px;padding:11px 18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;gap:9px;font-weight:600;white-space:nowrap;transition:background .18s,color .18s,border-color .18s,box-shadow .18s,transform .18s}.button:hover{transform:translateY(-1px)}.button:active{transform:scale(.98)}.primary{background:var(--blue);color:#fff}.primary:hover{background:#1848c5;box-shadow:0 4px 12px #245bea28}.secondary{background:#fff;border-color:#dce3ef;color:#253c63}.secondary:hover{background:#f5f8ff;border-color:#b5c6ed}.subtle{background:transparent;color:var(--muted)}.subtle:hover{background:#f0f4fa;color:#263d65}.section-icon{display:grid;place-items:center;width:46px;height:46px;border-radius:13px;background:#edf3ff;color:var(--blue);margin-bottom:20px}.device-card>.muted{font-size:12px}.device-card h2{overflow-wrap:anywhere}.facts{margin:22px 0}.facts>div{margin:14px 0}.facts dt{font-size:11px;color:#8994a6;margin-bottom:3px}.facts dd{margin:0;font-size:12px;color:#4b5c77;overflow-wrap:anywhere}.aside-note{font-size:11px;color:#8490a3;line-height:1.85;margin:24px 0 0;padding-top:18px;border-top:1px solid #edf0f6}.message{border:1px solid #cdddf9;background:#f0f5ff;color:#315b9e;padding:12px 15px;border-radius:9px;font-size:12px;line-height:1.7;margin-bottom:18px;overflow-wrap:anywhere}.message.error{border-color:#efd5d8;background:#fff6f6;color:#a33c45}.message.warning{border-color:#eddfbe;background:#fffbf0;color:#85611c}.payment-panel{margin-top:22px}.payment-content{display:flex;gap:34px;align-items:center;max-width:760px;margin:auto}.qr-wrap{border:1px solid var(--line);border-radius:14px;padding:14px;flex:none;background:#fff}.qr-wrap img{display:block;width:224px;height:224px;image-rendering:pixelated}.payment-details{flex:1;min-width:0}.payment-details h2{font-size:22px;margin-bottom:8px}.payment-details>.muted{font-size:12px}.payment-amount{display:block;font-size:28px;margin-top:12px}.payment-details .facts{margin:14px 0 20px}.payment-details .facts>div{display:flex;gap:16px;align-items:baseline;margin:8px 0}.payment-details .facts dt{flex:none}.payment-actions{display:flex;gap:8px;flex-wrap:wrap}.payment-actions .button{font-size:12px;min-height:38px;padding:9px 13px}.page-footer{display:flex;align-items:center;justify-content:center;gap:7px;color:#8a96a8;font-size:11px;padding:28px 0 0}.page-footer .icon{width:14px;height:14px}.loading-view{padding:105px 0;text-align:center;color:var(--muted)}.spinner{display:inline-block;width:26px;height:26px;border:2px solid #d9e2f5;border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:12px}.error-card{max-width:480px;margin:40px auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px}.error-card h1{font-size:25px}.error-card .button{margin-top:25px}.footnote{color:#8792a4;font-size:11px;margin:20px 0 0}dialog{padding:28px;width:min(460px,calc(100% - 32px));border:1px solid var(--line);border-radius:16px;color:#172033;box-shadow:0 24px 100px #111f3b35}dialog::backdrop{background:#14254470;backdrop-filter:blur(3px)}dialog .muted{font-size:13px}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}
.site-header,main>section:not([hidden]),.card,.plan,.terms,.facts>div,.message:not([hidden]),.payment-actions,dialog[open]{animation:enter .26s var(--ease) both}.plan:nth-child(2){animation-delay:35ms}.plan:nth-child(3){animation-delay:70ms}.plan:nth-child(4){animation-delay:105ms}button,span,strong,p,h1,h2,svg,img{transition:opacity .18s,color .18s,transform .18s}.leaving{pointer-events:none}@keyframes enter{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:850px){.checkout-grid{grid-template-columns:1fr}.device-card{display:grid;grid-template-columns:auto 1fr;column-gap:15px}.device-card .section-icon{grid-row:1/3;margin:0}.device-card h2{margin:0}.device-card .facts,.device-card .aside-note{grid-column:1/-1}.device-card .facts{display:flex;flex-wrap:wrap;gap:15px 30px;margin:18px 0 0}.device-card .facts>div{margin:0;min-width:120px}.device-card .aside-note{margin-top:20px}.payment-content{gap:24px}.qr-wrap img{width:192px;height:192px}}
@media(max-width:560px){.site-header{height:76px;padding:0 18px}.brand strong{font-size:15px}.brand-mark{width:36px;height:36px;font-size:20px;border-radius:10px}.header-label{font-size:0;gap:0}.header-label .icon{width:18px;height:18px}main{padding:28px 16px 15px}h1{font-size:25px}.page-heading .muted{font-size:12px}.card{padding:21px}.plans{gap:10px}.plan{padding:16px 13px;min-height:132px}.plan-price{font-size:25px}.plan-unit{margin-left:3px;font-size:11px}.selection-mark{right:10px;top:12px;width:14px;height:14px}.plan-average{font-size:10px}.terms{font-size:11px}.purchase-footer{gap:12px}.purchase-footer .button{font-size:12px;padding:12px}.purchase-footer strong{font-size:24px}.payment-content{flex-direction:column;align-items:stretch}.qr-wrap{align-self:center;padding:15px}.qr-wrap img{width:224px;height:224px}.payment-details h2{font-size:20px}.payment-details .eyebrow{margin-bottom:6px}.payment-details .facts>div{display:block;margin:10px 0}.payment-actions .button{flex:1}.page-footer{font-size:10px}.error-card{padding:25px;margin:25px auto}.dialog-actions .button{flex:1;font-size:12px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms!important;animation-delay:0ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}.button:hover,.button:active,.plan:hover,.plan:active{transform:none}.spinner{border-color:var(--blue)}}