:root{
  color-scheme: light;
  --paper:#EEF1F6;
  --sheet:#FFFFFF;
  --ink:#0F1E3D;
  --ink-2:#4A5772;
  --ink-3:#8590A6;
  --line:#DCE2EC;
  --brand:#2350C8;
  --brand-deep:#13286B;
  --mint:#10A37F;
  --amber:#F2B33D;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","STSong",serif;
  --sans:-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --num:"Avenir Next","Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:var(--sans);color:var(--ink);background:var(--paper);font-size:15px;line-height:1.65;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}

/* ---------- 顶栏 ---------- */
.top{position:sticky;top:0;z-index:20;background:rgba(238,241,246,.86);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
.top.scrolled{border-bottom-color:var(--line)}
.top .wrap{display:flex;align-items:center;height:68px;gap:28px}
.logo{display:flex;align-items:center;gap:10px;font-family:Georgia,var(--serif);font-size:26px;color:var(--brand-deep);letter-spacing:.5px}
.logo svg{width:28px;height:28px}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:8px 14px;border-radius:8px;color:var(--ink-2);font-size:14.5px}
.nav a:hover{color:var(--ink);background:rgba(15,30,61,.05)}
.nav a.on{color:var(--ink);font-weight:600;background:var(--sheet);box-shadow:0 1px 0 var(--line)}
.top-r{display:flex;gap:10px;align-items:center}
.chip-btn{padding:6px 11px;border:1px solid var(--line);border-radius:8px;font-size:13px;color:var(--ink-2);background:var(--sheet)}
.user{padding:8px 16px;border-radius:8px;background:var(--brand-deep);color:#fff;font-size:14px;font-weight:500}

/* ---------- 第一屏 ---------- */
.hero{min-height:calc(100vh - 68px);display:flex;flex-direction:column;justify-content:center;padding:40px 0 24px;position:relative}
.hero .wrap{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;width:100%}
.hero h1{font-family:var(--serif);font-weight:700;font-size:clamp(34px,4.4vw,54px);line-height:1.22;letter-spacing:-.5px}
.hero p.lead{margin-top:18px;font-size:17px;color:var(--ink-2)}
.hero-cta{margin-top:34px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:10px;font-weight:600;font-size:15px;transition:transform .15s,background .15s,border-color .15s}
.btn:active{transform:translateY(1px)}
.btn-main{background:var(--brand);color:#fff}
.btn-main:hover{background:#1C43AE}
.btn-ghost{background:var(--sheet);color:var(--ink);border:1px solid var(--line)}
.btn-ghost:hover{border-color:#B9C3D6}
.scroll-cue{position:absolute;left:50%;bottom:22px;transform:translateX(-50%);font-size:13px;color:var(--ink-3);display:flex;flex-direction:column;align-items:center;gap:4px}
.scroll-cue svg{width:16px;height:16px;animation:nudge 1.8s ease-in-out infinite}
@keyframes nudge{50%{transform:translateY(4px)}}

/* 卡密卡组：常驻视觉，轮换展示不同平台 */
.stage{position:relative;height:420px}
.stage .formula{position:absolute;font-family:Georgia,serif;font-style:italic;color:#B6C1D6;font-size:22px;user-select:none;pointer-events:none}
.deck{position:absolute;inset:40px 10px auto 30px;height:240px}
.keycard{position:absolute;inset:0;border-radius:20px;padding:26px 28px;color:#fff;
  background:radial-gradient(120% 140% at 100% 0%, var(--glow) 0%, transparent 55%),linear-gradient(150deg,var(--c1) 0%,var(--c2) 100%);
  box-shadow:0 30px 60px -24px rgba(12,27,68,.55), inset 0 0 0 1px rgba(255,255,255,.08);
  transition:transform .6s cubic-bezier(.2,.8,.2,1),opacity .6s;transform-origin:30% 100%}
.keycard[data-pos="0"]{transform:rotate(-4deg);z-index:3}
.keycard[data-pos="1"]{transform:rotate(3deg) translate(26px,-14px) scale(.96);z-index:2;opacity:.9}
.keycard[data-pos="2"]{transform:rotate(9deg) translate(50px,-26px) scale(.92);z-index:1;opacity:.75}
.keycard[data-pos="1"] *,.keycard[data-pos="2"] *{visibility:hidden}
.keycard .row{display:flex;justify-content:space-between;align-items:center}
.keycard .prod{display:flex;gap:10px;align-items:center;font-weight:600;font-size:17px}
.mono{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;font-family:var(--num);font-weight:700;font-size:14px;background:rgba(255,255,255,.14)}
.keycard .term{font-size:12.5px;padding:3px 10px;border-radius:20px;background:rgba(255,255,255,.12)}
.keycard .label{margin-top:46px;font-size:12.5px;color:rgba(255,255,255,.6)}
.keycard .code{margin-top:4px;font-family:"SF Mono",Menlo,Consolas,monospace;font-size:24px;letter-spacing:2px;filter:blur(6px);transition:filter .4s}
.keycard.shown .code{filter:none}
.keycard .foot{position:absolute;left:28px;right:28px;bottom:22px;display:flex;justify-content:space-between;font-size:12.5px;color:rgba(255,255,255,.6)}
.keycard .reveal{color:#fff;text-decoration:underline;text-underline-offset:3px}
.receipt{position:absolute;right:0;bottom:24px;width:250px;background:var(--sheet);border-radius:14px;padding:16px 18px;box-shadow:0 18px 40px -20px rgba(15,30,61,.35);border:1px solid var(--line);font-size:13px;z-index:4}
.receipt .st{display:flex;align-items:center;gap:8px;font-weight:600;color:var(--ink)}
.receipt .st i{width:8px;height:8px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(16,163,127,.15)}
.receipt dl{margin-top:10px;display:grid;grid-template-columns:auto 1fr;gap:4px 12px;color:var(--ink-3)}
.receipt dd{color:var(--ink);text-align:right}
.dots{position:absolute;left:30px;bottom:24px;display:flex;gap:8px;z-index:4}
.dots button{width:8px;height:8px;border-radius:8px;background:#C3CCDD;transition:width .3s,background .3s}
.dots button.on{width:22px;background:var(--brand)}

/* ---------- 第二屏：商城 ---------- */
section.block{padding:64px 0}
.head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:24px;flex-wrap:wrap}
.head h2{font-family:var(--serif);font-size:30px;font-weight:700;line-height:1.3}
.head p{color:var(--ink-2);margin-top:4px}

.shop{display:grid;grid-template-columns:220px 1fr;gap:24px;align-items:start}
.cats{position:sticky;top:88px;background:var(--sheet);border:1px solid var(--line);border-radius:16px;padding:10px}
.cats button{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-radius:10px;font-size:14.5px;color:var(--ink-2);text-align:left}
.cats button:hover{background:#F3F5F9;color:var(--ink)}
.cats button.on{background:#EAF0FD;color:var(--brand-deep);font-weight:600}
.cats .cnt{font-family:var(--num);font-size:12px;color:var(--ink-3);background:#F1F4F9;padding:1px 8px;border-radius:10px}
.cats button.on .cnt{background:#fff;color:var(--brand)}
.cats hr{border:0;border-top:1px solid var(--line);margin:8px 4px}
.cats .soon{padding:8px 12px;font-size:13px;color:var(--ink-3)}

.bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.bar .title{font-weight:700;font-size:17px}
.bar .title span{font-weight:400;color:var(--ink-3);font-size:14px;margin-left:6px}
.bar-r{display:flex;gap:10px}
.search{display:flex;align-items:center;gap:8px;background:var(--sheet);border:1px solid var(--line);border-radius:10px;padding:0 12px;height:38px;width:220px}
.search input{border:0;outline:0;font:inherit;font-size:14px;width:100%;background:none;color:var(--ink)}
.search svg{width:16px;height:16px;color:var(--ink-3);flex:none}
select.sort{height:38px;border:1px solid var(--line);border-radius:10px;background:var(--sheet);padding:0 10px;font:inherit;font-size:14px;color:var(--ink-2)}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(228px,1fr));gap:14px}
.card{position:relative;background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:16px;display:flex;flex-direction:column;transition:border-color .15s,box-shadow .15s}
.card:hover{border-color:#B9C6E0;box-shadow:0 10px 24px -16px rgba(15,30,61,.3)}
.card .top-row{display:flex;gap:11px;align-items:center}
.card .ic{flex:none;width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-family:var(--num);font-weight:700;font-size:15px;color:#fff}
.card h3{font-size:15px;font-weight:600;line-height:1.35}
.card .plat{font-size:12.5px;color:var(--ink-3)}
.card .tags{margin-top:12px;display:flex;flex-wrap:wrap;gap:6px}
.card .tags span{font-size:12px;padding:2px 8px;border-radius:6px;background:#F1F4F9;color:var(--ink-2)}
.card .bottom{margin-top:auto;padding-top:14px;display:flex;align-items:center;justify-content:space-between}
.card .price{font-family:var(--num);font-weight:700;font-size:22px;letter-spacing:-.5px}
.card .price small{font-family:var(--sans);font-weight:400;font-size:12.5px;color:var(--ink-3);margin-left:3px}
.card .buy{padding:7px 14px;border-radius:8px;background:var(--brand);color:#fff;font-size:13.5px;font-weight:600}
.card .buy:hover{background:#1C43AE}
.card .flag{position:absolute;top:12px;right:12px;font-size:11.5px;font-weight:700;padding:1px 8px;border-radius:10px;background:#FFF3D6;color:#8A5A00}
.card.ph .ic{background:#E4E9F2!important;color:var(--ink-3)}
.card.ph h3,.card.ph .price{color:var(--ink-3)}
.card.ph .buy{background:#E9EDF4;color:var(--ink-3);cursor:default}
.empty{grid-column:1/-1;text-align:center;padding:48px;background:var(--sheet);border-radius:14px;border:1px dashed var(--line);color:var(--ink-2)}
.empty a{color:var(--brand)}
.note{margin-top:16px;font-size:13px;color:var(--ink-3)}

/* 新手流程 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);background:var(--sheet);border-radius:18px;border:1px solid var(--line);overflow:hidden}
.step{padding:24px;border-right:1px solid var(--line);position:relative;display:flex;flex-direction:column}
.step:last-child{border-right:0}
.step .n{font-family:Georgia,serif;font-style:italic;font-size:28px;color:var(--brand);line-height:1}
.step h4{margin-top:12px;font-size:16px;font-weight:700}
.step p{margin-top:6px;font-size:13.5px;color:var(--ink-2);flex:1}
.step a{margin-top:14px;font-size:13.5px;color:var(--brand);font-weight:500}
.step a:hover{text-decoration:underline}

.duo{display:grid;grid-template-columns:1.5fr 1fr;gap:22px;margin-top:22px}
.faq{background:var(--sheet);border-radius:18px;border:1px solid var(--line);padding:6px 26px}
.faq details{border-bottom:1px solid var(--line)}
.faq details:last-child{border-bottom:0}
.faq summary{list-style:none;cursor:pointer;padding:16px 0;display:flex;justify-content:space-between;gap:16px;font-weight:500}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--ink-3);font-size:20px;line-height:1;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{padding:0 0 16px;color:var(--ink-2);font-size:14px}
.help{background:linear-gradient(160deg,#E3EAF8,#F4F6FB);border-radius:18px;padding:26px;display:flex;flex-direction:column;border:1px solid var(--line)}
.help h3{font-family:var(--serif);font-size:22px}
.help p{margin-top:8px;color:var(--ink-2);font-size:14px;flex:1}
.help .btn{margin-top:18px;align-self:flex-start}

footer{padding:40px 0 60px;color:var(--ink-3);font-size:13px}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:24px}

.fab{position:fixed;right:22px;bottom:22px;z-index:30;display:flex;align-items:center;gap:8px;padding:11px 16px;border-radius:30px;background:var(--sheet);border:1px solid var(--line);box-shadow:0 10px 24px -12px rgba(15,30,61,.4);font-size:14px;font-weight:500}
.fab i{width:8px;height:8px;border-radius:50%;background:var(--mint)}
.mnav{display:none;position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--sheet);border-top:1px solid var(--line);height:60px}
.mnav a{flex:1;display:grid;place-items:center;font-size:13px;color:var(--ink-3)}
.mnav a.on{color:var(--brand);font-weight:600}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .hero{min-height:auto;padding:48px 0 64px}
  .hero .wrap{grid-template-columns:1fr;gap:10px}
  .stage{height:380px;max-width:480px}
  .shop{grid-template-columns:1fr}
  .cats{position:static;display:flex;overflow-x:auto;gap:6px;padding:6px;scrollbar-width:none}
  .cats button{width:auto;white-space:nowrap;flex:none}
  .cats hr,.cats .soon{display:none}
  .steps{grid-template-columns:1fr 1fr}
  .step:nth-child(2){border-right:0}
  .step:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .duo{grid-template-columns:1fr}
}
@media (max-width:720px){
  .wrap{padding:0 16px}
  .nav{display:none}
  .top-r{margin-left:auto}
  .scroll-cue{display:none}
  .deck{inset:30px 40px auto 0}
  .receipt{width:210px}
  .grid{grid-template-columns:1fr 1fr;gap:10px}
  .card{padding:13px}
  .card .ic{width:34px;height:34px;font-size:13px}
  .card .plat{display:none}
  .card .bottom{flex-direction:column;align-items:stretch;gap:8px}
  .card .buy{text-align:center}
  .bar-r{width:100%}
  .search{flex:1;width:auto}
  .steps{grid-template-columns:1fr}
  .step{border-right:0!important;border-bottom:1px solid var(--line)}
  .mnav{display:flex}
  body{padding-bottom:64px}
  .fab{bottom:78px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}