:root{color-scheme:light;--ink:#14283e;--muted:#526477;--navy:#132a42;--blue:#1d577b;--aqua:#39b7ad;--line:#dfe8ed;--paper:#fff;--off:#f4f8f9;--shadow:0 18px 48px rgba(19,42,66,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei UI","PingFang SC","Noto Sans CJK SC",system-ui,sans-serif;line-height:1.65}
[hidden]{display:none!important}
button,a{touch-action:manipulation}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:3px solid var(--aqua);outline-offset:3px}
.container{width:min(1180px,calc(100% - 48px));margin:auto}
.skip-link{position:absolute;left:12px;top:-60px;z-index:100;padding:8px 14px;background:white;border:2px solid var(--aqua)}
.skip-link:focus{top:8px}
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}
.header-inner{min-height:78px;display:flex;align-items:center;gap:34px}
.brand{display:inline-flex;align-items:center;gap:11px;font-size:18px;font-weight:800;white-space:nowrap;letter-spacing:.02em}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:11px;background:var(--navy);color:white;font-size:19px}
.header-nav{display:flex;gap:28px;margin-left:auto;color:var(--muted);font-size:14px;font-weight:600}
.header-nav a:hover,.text-link:hover{color:var(--blue)}
.header-action{margin-left:12px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:51px;padding:12px 20px;border:1px solid transparent;border-radius:10px;font-weight:700;font-size:14px;line-height:1.3;text-align:center;transition:transform .16s ease,background .16s ease,box-shadow .16s ease}
.button:hover{transform:translateY(-2px)}
.button-primary,.button-small{color:#fff;background:var(--navy);box-shadow:0 10px 22px rgba(19,42,66,.17)}
.button-primary:hover,.button-small:hover{background:#1e4b65}
.button-small{min-height:42px;padding:10px 15px;font-size:13px}
.button-outline{background:transparent;color:var(--navy);border-color:#b8c8d2}
.button-outline:hover{border-color:var(--blue);background:#edf5f7}
.hero{position:relative;overflow:hidden;background:linear-gradient(118deg,#f6fbfb 0%,#f7fafc 51%,#e9f4f3 100%);border-bottom:1px solid var(--line)}
.hero:before{content:"";position:absolute;width:540px;height:540px;border:1px solid rgba(55,150,160,.12);border-radius:50%;right:-130px;top:-185px;box-shadow:0 0 0 80px rgba(55,150,160,.025),0 0 0 160px rgba(55,150,160,.02);pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(320px,.7fr);gap:64px;align-items:center;min-height:475px;padding-top:72px;padding-bottom:78px}
.eyebrow,.section-kicker{font-size:12px;letter-spacing:.16em;font-weight:800;color:#237d84}
.eyebrow{display:flex;align-items:center;gap:10px}
.eyebrow-line{width:23px;height:2px;background:var(--aqua)}
h1,h2,h3,h4,p{margin-top:0}
h1{font-size:clamp(38px,5vw,65px);line-height:1.24;letter-spacing:-.035em;margin:18px 0 20px}
.muted-title{color:#456277}
.hero-description{max-width:610px;font-size:17px;color:var(--muted);margin-bottom:29px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.action-message{min-height:25px;margin:11px 0 0;color:#9d4325;font-weight:700;font-size:13px}
.announcement-card{align-self:center;background:white;border:1px solid #d8e7e8;border-radius:18px;padding:32px;box-shadow:var(--shadow)}
.card-topline{display:flex;align-items:center;gap:8px;text-transform:uppercase;letter-spacing:.12em;font-size:12px;font-weight:800;color:#2b8187;margin-bottom:24px}
.status-dot{width:7px;height:7px;border-radius:50%;background:var(--aqua);box-shadow:0 0 0 4px #e3f6f4}
.announcement-card h2{font-size:24px;margin-bottom:12px;line-height:1.35}
.announcement-card p{color:var(--muted);font-size:15px;min-height:70px;margin-bottom:20px}
.announcement-footnote{border-top:1px solid var(--line);padding-top:16px;color:#718495;font-size:12px}
.steps-section,.redeem-section,.support-section{padding:74px 0}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:27px}
.section-heading h2,.support-grid h2{font-size:clamp(28px,3vw,38px);line-height:1.28;letter-spacing:-.025em;margin:8px 0 0}
.section-heading p{color:var(--muted);margin:0 0 4px;font-size:14px}
.steps-grid{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.step-card{min-width:0;border:1px solid var(--line);background:#fff;border-radius:14px;padding:27px 23px 24px}
.step-number{display:block;color:#2b999b;font-size:24px;line-height:1;font-weight:800;letter-spacing:-.06em;margin-bottom:29px}
.step-card h3{font-size:18px;margin-bottom:8px}
.step-card p{color:var(--muted);font-size:13px;line-height:1.7;margin:0}
.redeem-section{background:var(--off);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.mode-badge{display:inline-flex;align-items:center;justify-content:center;border:1px solid #b6d9d6;border-radius:999px;background:#e8f7f4;color:#216e72;padding:6px 13px;font-size:12px;font-weight:800;white-space:nowrap}
.redeem-panel{background:white;border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow)}
.redeem-panel-head{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:24px 30px;border-bottom:1px solid var(--line)}
.redeem-panel-head h3{font-size:19px;margin:0 0 3px}.redeem-panel-head p{font-size:13px;color:var(--muted);margin:0}
.entry-message{margin:0;padding:12px 30px;color:#9d4325;background:#fff5f0;font-size:13px;font-weight:700;border-bottom:1px solid #f4d9ca}
.text-link{font-size:13px;color:#146378;font-weight:800;white-space:nowrap}
.pending-view{min-height:290px;padding:50px 24px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.pending-icon{width:51px;height:51px;display:grid;place-items:center;border-radius:14px;background:#e8f5f4;color:#297d83;font-weight:800;font-size:24px;margin-bottom:15px}
.pending-view h4{font-size:20px;margin-bottom:5px}.pending-view p{color:var(--muted);max-width:500px;margin:0;font-size:14px}
.iframe-view{height:min(75vh,850px);min-height:580px;overflow:hidden}
.iframe-view iframe{display:block;width:100%;height:100%;border:0;background:white}
.frame-note{margin:0;padding:13px 30px;background:#f6fafb;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
.support-grid{display:grid;grid-template-columns:1fr minmax(250px,380px);gap:60px;align-items:center}
.support-grid>div:first-child>p{color:var(--muted);max-width:620px;font-size:15px;margin:18px 0 0}
.support-card{border:1px solid var(--line);border-radius:15px;padding:28px;background:#f9fbfc}
.support-card span{display:block;color:var(--muted);font-size:13px;margin-bottom:10px}.support-card strong{display:block;font-size:21px;overflow-wrap:anywhere}.support-card p{color:#718495;font-size:12px;margin:12px 0 0}
.site-footer{background:var(--navy);color:#bed0dc;padding:27px 0;font-size:12px}
.footer-inner{display:flex;justify-content:space-between;gap:20px}.footer-inner span:first-child{font-weight:800;color:#fff;font-size:15px}
.mobile-action{display:none}
@media(max-width:950px){.header-nav{display:none}.header-action{margin-left:auto}.hero-grid{gap:28px}.steps-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.container{width:min(100% - 32px,540px)}.header-inner{min-height:65px}.brand{font-size:15px}.brand-mark{width:34px;height:34px}.header-action{display:none}.hero-grid{display:block;min-height:0;padding:55px 0 54px}.hero h1{font-size:clamp(36px,10vw,51px)}.hero-description{font-size:15px}.hero-actions{display:none}.announcement-card{margin-top:34px;padding:24px}.announcement-card p{min-height:0}.steps-section,.redeem-section,.support-section{padding:55px 0}.section-heading{align-items:start;flex-direction:column;gap:8px}.section-heading p{margin:0}.steps-grid{gap:12px}.step-card{padding:20px 16px}.step-number{margin-bottom:20px}.step-card h3{font-size:16px}.redeem-panel-head{display:block;padding:20px}.redeem-panel-head .text-link{display:inline-block;margin-top:12px;white-space:normal}.pending-view{min-height:280px}.iframe-view{height:72dvh;min-height:520px}.frame-note{padding:12px 20px}.support-grid{grid-template-columns:1fr;gap:25px}.footer-inner{display:block}.footer-inner span{display:block;margin-bottom:8px}.mobile-action{display:block;position:fixed;bottom:0;left:0;right:0;z-index:40;background:rgba(255,255,255,.97);border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));box-shadow:0 -8px 24px rgba(19,42,66,.08)}.mobile-action .button{width:100%;min-height:52px}.site-footer{padding-bottom:112px}}
@media(max-width:380px){.steps-grid{grid-template-columns:1fr}.hero h1{font-size:35px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}