/* Pure Light —— aiczz 设计系统 v5（苹果风·纯净光感） */
:root{
  --bg:#fbfbfd;--bg2:#f5f5f7;--card:#ffffff;
  --line:rgba(0,0,0,.06);--line2:rgba(0,0,0,.1);
  --ink:#1d1d1f;--muted:#6e6e73;--faint:#a1a1a6;
  --blue:#0071e3;--blue-d:#0060c0;--blue-soft:rgba(0,113,227,.08);
  --ok:#248a3d;--danger:#d70015;
  --shadow:0 2px 8px rgba(0,0,0,.04),0 12px 32px rgba(0,0,0,.06);
  --shadow-lg:0 4px 12px rgba(0,0,0,.05),0 24px 60px rgba(0,20,60,.1);
  --ease:cubic-bezier(0.16,1,0.3,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;background:var(--bg);color:var(--ink);line-height:1.75;-webkit-font-smoothing:antialiased}
::selection{background:rgba(0,113,227,.2)}
:focus-visible{outline:2.5px solid var(--blue);outline-offset:3px;border-radius:6px}
::-webkit-scrollbar{width:11px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#d2d2d7;border-radius:8px;border:2.5px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#b8b8bf}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:3px}
img{max-width:100%;display:block}
h1,h2,h3{text-wrap:balance}
.wrap{max-width:1120px;margin:0 auto;padding:0 22px}
.skip-link{position:absolute;left:-9999px;top:8px;z-index:99;background:var(--blue);color:#fff;padding:9px 18px;border-radius:10px;font-weight:700}
.skip-link:focus{left:12px}
.grain{display:none}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:980px;padding:13px 28px;font-size:15.5px;font-weight:600;cursor:pointer;transition:transform .15s var(--ease),box-shadow .3s var(--ease),background .2s,color .2s,border-color .2s;font-family:inherit;letter-spacing:-.01em}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 4px 16px rgba(0,113,227,.25)}
.btn-primary:hover{background:var(--blue-d);box-shadow:0 8px 24px rgba(0,113,227,.35);text-decoration:none}
.btn-ghost{background:transparent;color:var(--blue);border:1.5px solid rgba(0,113,227,.35)}
.btn-ghost:hover{background:var(--blue-soft);border-color:var(--blue);text-decoration:none}
.btn-block{width:100%}
.btn-lg{padding:16px 38px;font-size:16.5px}

/* nav —— 苹果式毛玻璃 */
header.nav{position:sticky;top:0;z-index:50;background:rgba(251,251,253,.78);backdrop-filter:saturate(1.8) blur(20px);border-bottom:1px solid var(--line)}
.nav-in{max-width:1120px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:inline-flex;align-items:center;gap:9px;font-size:18px;font-weight:800;color:var(--ink);letter-spacing:-.02em}
.logo:hover{text-decoration:none}
.logo .mk{width:30px;height:30px;border-radius:9px;background:linear-gradient(145deg,#3b96ff,#0064d4);display:inline-flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,113,227,.3)}
.logo .mk svg{width:17px;height:17px}
.logo b{color:var(--blue)}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#424245;font-size:14px;font-weight:500;transition:color .18s}
.nav-links a:hover{color:var(--blue);text-decoration:none}
.nav-links a[aria-current="page"]{color:var(--blue)}
.nav-links a.cta{color:#fff;background:var(--blue);padding:8px 19px;border-radius:980px;font-weight:600}
.nav-links a.cta:hover{background:var(--blue-d);color:#fff}
@media(max-width:720px){.nav-links .hide-sm{display:none}.nav-links{gap:15px}}

/* hero —— 纯净光感：白底 + 顶部淡蓝紫光晕 + 光尘 */
.hero-cine{position:relative;padding:96px 0 104px;text-align:center;overflow:hidden;background:
  radial-gradient(58% 68% at 50% -12%,rgba(0,113,227,.10),transparent 62%),
  radial-gradient(42% 52% at 82% -6%,rgba(124,86,255,.07),transparent 60%),
  radial-gradient(40% 50% at 14% -4%,rgba(0,180,240,.06),transparent 60%),
  var(--bg)}
.hero-cine #fx{position:absolute;inset:0;width:100%;height:100%;display:block}
.hero-cine .wrap{position:relative;z-index:2}
.hero-cine h1{font-size:clamp(34px,5.8vw,60px);font-weight:800;line-height:1.12;letter-spacing:-.035em;color:var(--ink)}
.hero-cine h1 .hl{color:var(--blue)}
.hero-cine .sub{margin:24px auto 0;max-width:620px;font-size:clamp(16.5px,2.2vw,20px);color:var(--muted);font-weight:450;letter-spacing:-.01em}
.hero-cine .cta-row{margin-top:34px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.btn-hero-ghost{background:transparent;color:var(--blue);border:1.5px solid rgba(0,113,227,.35)}
.btn-hero-ghost:hover{background:var(--blue-soft);border-color:var(--blue);text-decoration:none}
.trust-row{margin-top:44px;display:flex;gap:11px;justify-content:center;flex-wrap:wrap}
.trust-chip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:980px;padding:9px 18px;font-size:13.5px;font-weight:550;color:#424245;box-shadow:0 2px 10px rgba(0,0,0,.04)}
.trust-chip svg{width:15px;height:15px;color:var(--blue);flex-shrink:0}
.hero-fade{display:none}

/* sections */
.section{padding:72px 0}
.section-alt{background:var(--bg2)}
.sec-head{text-align:center;max-width:660px;margin:0 auto 46px}
.sec-head h2{font-size:clamp(26px,4vw,40px);font-weight:800;letter-spacing:-.03em}
.sec-head p{margin-top:14px;color:var(--muted);font-size:17px;letter-spacing:-.01em}

/* pricing —— 白玻璃卡，刚性等高 */
.pricing{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:15px;align-items:stretch}
@media(min-width:1080px){.pricing{grid-template-columns:repeat(5,1fr)}}
.pcard{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:27px 20px 21px;display:flex;flex-direction:column;position:relative;transition:transform .35s var(--ease),box-shadow .35s var(--ease);box-shadow:var(--shadow)}
.pcard:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.pcard .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--blue);color:#fff;font-size:12px;font-weight:700;padding:4px 14px;border-radius:980px;white-space:nowrap;box-shadow:0 4px 12px rgba(0,113,227,.3)}
.pcard h3{font-size:17px;font-weight:750;line-height:1.35;height:48px;display:flex;align-items:flex-start;letter-spacing:-.015em}
.pcard .best{color:var(--faint);font-size:13px;height:22px;overflow:hidden}
.pcard .price{margin-top:10px;display:flex;align-items:baseline;gap:4px;height:48px;font-variant-numeric:tabular-nums}
.pcard .price .cur{font-size:17px;font-weight:650;color:var(--muted)}
.pcard .price .num{font-size:39px;font-weight:800;letter-spacing:-.03em;color:var(--ink)}
.pcard .price .per{color:var(--faint);font-size:13.5px}
.pcard .orig{color:var(--faint);font-size:13px;text-decoration:line-through;height:22px;font-variant-numeric:tabular-nums}
.pcard .quota{margin:10px 0 20px;color:var(--muted);font-size:13.5px;line-height:1.62;flex:1;min-height:64px}
.pcard .btn{margin-top:auto;padding:12px 16px;font-size:14.5px}
.pcard.featured{border:none;box-shadow:0 0 0 2px var(--blue),var(--shadow-lg)}
.pcard.featured .price .num{color:var(--blue)}
.pricing-note{text-align:center;color:var(--faint);margin-top:24px;font-size:14px}

/* 流程时间轴 */
.timeline{position:relative;max-width:620px;margin:0 auto;padding-left:6px}
.tl-track{position:absolute;left:25px;top:10px;bottom:10px;width:2px;background:#e3e3e8;border-radius:2px;overflow:hidden}
.tl-progress{width:100%;height:0;background:var(--blue);border-radius:2px;transition:height .18s linear}
.tl-item{position:relative;display:flex;gap:22px;padding:0 0 36px;align-items:flex-start}
.tl-item:last-child{padding-bottom:0}
.tl-dot{position:relative;z-index:2;width:38px;height:38px;flex-shrink:0;border-radius:50%;background:#fff;border:2px solid #d9d9de;color:var(--faint);font-weight:800;font-size:15px;display:flex;align-items:center;justify-content:center;transition:all .4s var(--ease);font-variant-numeric:tabular-nums}
.tl-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:19px 22px;flex:1;opacity:.55;transform:translateX(12px);transition:opacity .45s var(--ease),transform .45s var(--ease),box-shadow .45s;box-shadow:0 1px 4px rgba(0,0,0,.03)}
.tl-card h3{font-size:16.5px;font-weight:750;margin-bottom:5px;letter-spacing:-.01em}
.tl-card p{color:var(--muted);font-size:14.5px}
.tl-item.on .tl-dot{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(0,113,227,.3)}
.tl-item.on .tl-card{opacity:1;transform:none;box-shadow:var(--shadow)}

/* why us —— 图标左置双列清单 */
.merits{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:10px 44px;max-width:880px;margin:0 auto}
.merit{display:flex;gap:16px;padding:19px 8px;align-items:flex-start}
.merit .ic{width:40px;height:40px;flex-shrink:0;border-radius:12px;background:var(--blue-soft);display:flex;align-items:center;justify-content:center}
.merit .ic svg{width:19px;height:19px;color:var(--blue)}
.merit h3{font-size:16px;font-weight:750;margin-bottom:3px;letter-spacing:-.01em}
.merit p{color:var(--muted);font-size:14px;line-height:1.65}

/* faq */
.faq{max-width:760px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:2px 22px;margin:11px 0;transition:box-shadow .3s;box-shadow:0 1px 4px rgba(0,0,0,.03)}
.faq details[open]{box-shadow:var(--shadow)}
.faq summary{cursor:pointer;font-weight:650;padding:17px 0;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px;letter-spacing:-.01em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:22px;font-weight:300;flex-shrink:0;transition:transform .3s var(--ease)}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin:0 0 17px;color:var(--muted);font-size:14.5px;max-width:65ch}

/* footer —— 苹果式浅灰 */
footer{background:var(--bg2);border-top:1px solid var(--line);color:var(--muted);padding:46px 0 34px;margin-top:56px}
footer .cols{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}
footer .logo{color:var(--ink)}
footer .fcol h4{color:var(--ink);font-size:13.5px;font-weight:700;margin-bottom:12px}
footer .fcol a{display:block;color:#6e6e73;font-size:13.5px;margin:7px 0}
footer .fcol a:hover{color:var(--blue)}
footer .disclaimer{margin-top:30px;padding-top:22px;border-top:1px solid var(--line);color:#a1a1a6;font-size:12.5px;line-height:1.75;max-width:78ch}

/* checkout + 内页 */
.page{max-width:700px;margin:0 auto;padding:44px 22px 68px}
.card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow)}
.article{max-width:760px;margin:0 auto;padding:44px 22px 68px}
.article h1{font-size:clamp(25px,4vw,34px);font-weight:800;margin-bottom:8px;letter-spacing:-.025em}
.article .meta{color:var(--faint);font-size:13px;margin-bottom:26px}
.article h2{font-size:20px;font-weight:750;margin:30px 0 10px;letter-spacing:-.015em}
.article p,.article li{color:#424245;font-size:15.5px;margin:10px 0;max-width:72ch}
.article ul{padding-left:22px}
.field{margin:18px 0}
.field label{display:block;font-weight:650;font-size:14.5px;margin-bottom:9px}
.field input,.field select{width:100%;padding:14px;border:1.5px solid #d9d9de;border-radius:13px;font-size:16px;font-family:inherit;background:#fff;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.field input:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(0,113,227,.12)}
.field input::placeholder{color:var(--faint)}
.pay-tabs{display:flex;gap:11px;margin:8px 0 4px}
.pay-tab{flex:1;border:1.5px solid #d9d9de;border-radius:13px;padding:14px;text-align:center;font-weight:650;cursor:pointer;background:#fff;transition:all .18s var(--ease)}
.pay-tab:active{transform:scale(.98)}
.pay-tab.active{border-color:var(--blue);background:var(--blue-soft);color:var(--blue);box-shadow:0 0 0 3px rgba(0,113,227,.1)}
.check-row{display:flex;align-items:flex-start;gap:11px;background:var(--bg2);border:1.5px solid var(--line);border-radius:13px;padding:14px;cursor:pointer;transition:border-color .2s}
.check-row:hover{border-color:var(--line2)}
.check-row input{width:18px;height:18px;margin-top:3px;accent-color:var(--blue);cursor:pointer}
.check-row .t{font-weight:700;font-size:14.5px}
.check-row .d{color:var(--faint);font-size:13px}
.qr-box{text-align:center;padding:18px}
.qr-box img{margin:0 auto;border:1px solid var(--line);border-radius:16px;background:#fff;padding:8px;box-shadow:var(--shadow)}
.amt{font-size:34px;font-weight:800;color:var(--blue);margin:10px 0;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.note{background:#f0faf2;border:1px solid rgba(36,138,61,.16);border-radius:13px;padding:13px 17px;color:#1e7233;font-size:14px;margin:18px 0}
.muted{color:var(--muted)}.center{text-align:center}.hidden{display:none}
table{color:var(--ink);font-variant-numeric:tabular-nums}

/* 404 */
.err-page{min-height:60vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:40px 22px}
.err-page .code{font-size:92px;font-weight:800;color:var(--blue);letter-spacing:-.05em;line-height:1;font-variant-numeric:tabular-nums}
.err-page p{color:var(--muted);margin:14px 0 26px}

/* 列表入场（仅价格区） */
.pricing.reveal .pcard{opacity:0;transform:translateY(22px);transition:opacity .6s var(--ease),transform .6s var(--ease),box-shadow .35s var(--ease)}
.pricing.reveal.in .pcard{opacity:1;transform:none}
.pricing.reveal.in .pcard:nth-child(2){transition-delay:.06s}
.pricing.reveal.in .pcard:nth-child(3){transition-delay:.12s}
.pricing.reveal.in .pcard:nth-child(4){transition-delay:.18s}
.pricing.reveal.in .pcard:nth-child(5){transition-delay:.24s}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .pricing.reveal .pcard{opacity:1;transform:none}
}