:root{--bg:#f4f6fa;--surface:#fff;--surface-soft:#f8fafc;--ink:#111827;--ink-2:#374151;--ink-3:#6b7280;--ink-4:#9ca3af;--line:#e5e7eb;--line-strong:#d1d5db;--accent:#2f54d0;--accent-deep:#2543a8;--accent-soft:#eef1ff;--accent-border:#c7d2fe;--success-bg:#ecfdf3;--success-text:#047857;--success-line:#a7f3d0;--warning-bg:#fffbeb;--warning-text:#92400e;--warning-line:#fde68a;--danger-bg:#fef2f2;--danger-text:#b91c1c;--danger-line:#fecaca;--redeem-red:#e53935;--redeem-red-soft:#fff1f0;--redeem-red-line:#ffc9c7;--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--shadow-panel:0 10px 30px rgba(17,24,39,.05);--shadow-float:0 10px 24px rgba(18,183,245,.34)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:92px}body,html{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica 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ease}.footer-support-button:hover{color:var(--accent-deep)}@media(max-width:1100px){.redeem-layout{grid-template-columns:1fr}.promo-section{position:static}.promo-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));padding:6px}.promo-item{border:0;border-radius:var(--radius-md)}}@media(max-width:1024px){.receipt-meta{grid-template-columns:repeat(3,minmax(0,1fr))}.receipt-meta>div:nth-child(3n){border-right:0}.receipt-meta>div{border-bottom:1px solid var(--line)}.receipt-meta>div:nth-last-child(-n+3){border-bottom:0}.contact-panel{grid-template-columns:1fr}.support-card{max-width:460px}}@media(max-width:760px){.nav-button{display:none}.header-contact{padding:8px 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