@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Manrope:wght@700;800&display=swap');

:root{
  color-scheme:dark;
  --bg:#060907;
  --bg-elevated:#0e1613;
  --surface:rgba(255,255,255,.035);
  --border:rgba(255,255,255,.09);
  --border-strong:rgba(185,243,206,.4);
  --text:#f3f8f5;
  --text-muted:#9fb6ab;
  --text-faint:#6a8478;
  --accent:#b9f3ce;
  --accent-2:#7be0a4;
  --accent-ink:#07160e;
  --danger:#ff9a8c;
  --radius-lg:24px;
  --radius-md:14px;
  --radius-sm:10px;
  --shadow-lg:0 40px 100px -30px rgba(0,0,0,.65),0 0 0 1px rgba(255,255,255,.04);
  --shadow-btn:0 10px 30px -10px rgba(185,243,206,.45);
  --ease:cubic-bezier(.16,1,.3,1);
  --heading-start:#ffffff;
  --heading-end:#c9dcd2;
  --input-bg:rgba(0,0,0,.28);
  --card-top:rgba(255,255,255,.045);
  --card-bottom:rgba(255,255,255,.015);
  --grid:rgba(255,255,255,.025);
  --focus-ring:rgba(185,243,206,.18);
}
:root[data-theme="light"]{
  color-scheme:light;
  --bg:#f3f7f4;
  --bg-elevated:#fff;
  --surface:rgba(255,255,255,.78);
  --border:rgba(23,65,44,.17);
  --border-strong:rgba(24,108,68,.5);
  --text:#142a20;
  --text-muted:#435e50;
  --text-faint:#536b5e;
  --accent:#176a43;
  --accent-2:#105335;
  --accent-ink:#fff;
  --danger:#ae3024;
  --shadow-lg:0 24px 64px -28px rgba(31,69,47,.2),0 0 0 1px rgba(255,255,255,.7);
  --shadow-btn:0 8px 22px -10px rgba(23,106,67,.35);
  --heading-start:#142a20;
  --heading-end:#316849;
  --input-bg:#fff;
  --card-top:rgba(255,255,255,.95);
  --card-bottom:rgba(255,255,255,.7);
  --grid:rgba(23,65,44,.035);
  --focus-ring:rgba(23,106,67,.16);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(60% 50% at 15% 0%,rgba(185,243,206,.14),transparent 60%),
    radial-gradient(50% 40% at 100% 10%,rgba(122,224,164,.08),transparent 60%);
  background-attachment:fixed;
  min-height:100vh;
  position:relative;
}
body::before{
  content:'';
  position:fixed;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(60% 60% at 50% 0%,black,transparent 80%);
  -webkit-mask-image:radial-gradient(60% 60% at 50% 0%,black,transparent 80%);
  z-index:0;
}
main{position:relative;z-index:1;max-width:980px;margin:auto;padding:28px 24px 60px}

header{
  display:flex;align-items:center;gap:12px;
  padding:14px 20px;
  border:1px solid var(--border);
  border-radius:999px;
  background:var(--surface);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--text-muted);
}
.logo{
  display:grid;place-items:center;width:34px;height:34px;flex:none;
  background:linear-gradient(145deg,var(--accent),var(--accent-2));
  color:var(--accent-ink);border-radius:10px;
  font-size:18px;font-weight:800;font-family:'Manrope',sans-serif;
  box-shadow:0 6px 16px -4px rgba(185,243,206,.5);
}
header>span:nth-child(2){color:var(--text);font-weight:700;letter-spacing:3px}
.muted{color:var(--text-faint)}
.badge{
  margin-left:auto;border:1px solid var(--border-strong);
  background:rgba(185,243,206,.08);color:var(--accent);
  border-radius:999px;padding:7px 14px;letter-spacing:1px;font-size:11px;font-weight:600;text-transform:none;
}

.platforms{display:inline-flex;gap:4px;margin:28px 0 0;padding:4px;background:var(--surface);border:1px solid var(--border);border-radius:999px}
.platform-tab{
  background:transparent;border:0;color:var(--text-muted);
  border-radius:999px;padding:9px 20px;font-size:13px;font-weight:600;
  cursor:pointer;width:auto;margin:0;transition:all .25s var(--ease);
}
.platform-tab.active{background:var(--text);color:var(--bg)}
.platform-tab:not(.active):hover{color:var(--text)}

.intro{padding:56px 0 40px;max-width:680px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:12px!important;letter-spacing:3px;text-transform:uppercase;
  color:var(--accent)!important;font-weight:700;margin:0 0 18px;
}
.eyebrow::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 12px 2px rgba(185,243,206,.7)}
h1{
  font-family:'Manrope','Inter',sans-serif;
  font-size:clamp(38px,6vw,64px);line-height:1.05;letter-spacing:-2.5px;font-weight:800;
  margin:0 0 20px;
  background:linear-gradient(180deg,var(--heading-start) 30%,var(--heading-end) 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
p{line-height:1.7;color:var(--text-muted);margin:0 0 12px}
.intro>p:last-child{max-width:460px;font-size:16px}

.trust-row{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:26px}
.trust-row span{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-muted)}
.trust-row svg{flex:none;color:var(--accent)}

.card{
  max-width:640px;
  background:linear-gradient(180deg,var(--card-top),var(--card-bottom));
  border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:36px;box-shadow:var(--shadow-lg);
  backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
}
h2{font-family:'Manrope',sans-serif;font-size:23px;font-weight:700;margin:0 0 26px;letter-spacing:-.4px}

label{display:block;font-size:13px;font-weight:600;color:var(--text-muted);margin:20px 0 8px}
input:not([type=checkbox]), #paymentCurrency{
  width:100%;padding:15px 16px;background:var(--input-bg);
  border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text);font-size:15px;font-family:inherit;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
input:not([type=checkbox])::placeholder{color:var(--text-faint)}
input:focus, #paymentCurrency:focus{outline:none;border-color:var(--border-strong);box-shadow:0 0 0 4px var(--focus-ring)}
input[aria-invalid="true"]{border-color:var(--danger)}

.hint{font-size:12.5px;margin:10px 0 0;color:var(--text-faint)}
#emailError,#payError{color:var(--danger);margin-top:6px}
#invAddress{word-break:break-all}
.consent{display:flex;gap:10px;font-size:12.5px;line-height:1.7;color:var(--text-muted);align-items:flex-start;margin-top:20px}
.consent{cursor:pointer}
.consent input{flex:none;width:22px;height:22px;min-width:22px;margin:1px 0 0;accent-color:var(--accent);cursor:pointer}

button,.button{
  display:flex;justify-content:space-between;align-items:center;width:100%;
  padding:16px 20px;border:0;border-radius:var(--radius-sm);
  background:linear-gradient(180deg,var(--accent),var(--accent-2));
  color:var(--accent-ink);font-size:15px;font-weight:700;
  cursor:pointer;text-decoration:none;margin-top:24px;
  box-shadow:var(--shadow-btn);
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),filter .18s var(--ease);
}
button:hover,.button:hover{transform:translateY(-1px);filter:brightness(1.05)}
button:active,.button:active{transform:translateY(0)}
button:disabled{opacity:.5;cursor:wait;transform:none}
button span,.button span{transition:transform .2s var(--ease)}
button:hover span,.button:hover span{transform:translateX(3px)}

.secondary{
  background:transparent;color:var(--text-muted);
  border:1px solid var(--border);box-shadow:none;
  font-size:13.5px;font-weight:600;padding:13px;
}
.secondary:hover{border-color:var(--border-strong);color:var(--text);filter:none}

a{color:var(--accent)}
#download{display:block;margin:18px 0 0;font-size:13.5px;text-align:center}

#invQr{display:block;margin:4px auto 20px;border-radius:16px;padding:14px;background:#fff;box-shadow:var(--shadow-lg)}

ol{list-style:none;padding:0;margin:28px 0;counter-reset:steps;position:relative}
li{padding:4px 0 26px 44px;color:var(--text-faint);counter-increment:steps;position:relative;font-size:14.5px}
li:before{
  content:counter(steps);position:absolute;left:0;top:-2px;
  display:inline-grid;place-items:center;width:30px;height:30px;
  border:1px solid var(--border);border-radius:50%;font-size:12px;font-weight:700;
  background:var(--bg-elevated);transition:all .3s var(--ease);
}
li:not(:last-child):after{content:'';position:absolute;left:14px;top:30px;bottom:0;width:1px;background:var(--border)}
li.active{color:var(--text)}
li.active:before{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);box-shadow:0 0 0 4px rgba(185,243,206,.15)}

#error{color:var(--danger);font-size:13.5px;margin:14px 0 0}
.privacy{max-width:640px;margin:44px 0;font-size:12.5px;color:var(--text-faint)}
.privacy h2{font-size:14px;margin-bottom:10px;color:var(--text-muted)}

footer{
  display:flex;justify-content:space-between;align-items:center;
  border-top:1px solid var(--border);padding-top:26px;margin-top:40px;
  color:var(--text-faint);font-size:11.5px;gap:16px;
}

[hidden]{display:none!important}
.ios-guide{max-width:640px;margin:0 0 24px;border:1px solid var(--border-strong);border-radius:var(--radius-md);background:var(--surface)}
.ios-guide>summary{padding:20px 24px;color:var(--accent);font-size:16px;font-weight:700;cursor:pointer;line-height:1.5}
.ios-guide>summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px;border-radius:var(--radius-md)}
.guide-body{padding:0 24px 24px;font-size:14px;overflow-wrap:anywhere}
.guide-steps{margin:24px 0}
.guide-steps li{padding:0 0 24px;margin:0 0 24px;border-bottom:1px solid var(--border);color:var(--text)}
.guide-steps li::before,.guide-steps li::after{display:none}
.guide-body h3{font-size:16px;line-height:1.5;color:var(--text);margin:0 0 10px}
.guide-sources{font-size:12px;margin-top:20px}
.page-navigation{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:32px}
.page-navigation .platforms{margin:0}
.history-nav{display:flex;gap:8px;min-height:40px}
.history-nav button{width:auto;margin:0;padding:10px 14px;gap:8px;background:var(--surface);color:var(--text-muted);border:1px solid var(--border);box-shadow:none;font-size:13px}
.history-nav button:disabled{opacity:.35;cursor:default}
.history-nav button:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.language-control{margin:0;flex:none;letter-spacing:normal;text-transform:none}
.language-control select{font:inherit;font-size:13px;color:var(--text);background:var(--bg-elevated);border:1px solid var(--border);border-radius:999px;padding:9px 12px;max-width:132px;cursor:pointer}
.language-control select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.header-tools{display:flex;align-items:center;gap:8px;margin-left:auto}
.theme-toggle{flex:none;display:flex;justify-content:center;align-items:center;width:40px;height:40px;margin:0;padding:0;border-radius:50%;background:var(--bg-elevated);color:var(--text-muted);border:1px solid var(--border);box-shadow:none}
.theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.theme-toggle svg{flex:none;width:18px;height:18px}
.theme-moon{display:none}
[data-theme="light"] .theme-sun{display:none}
[data-theme="light"] .theme-moon{display:block}
@media(max-width:700px){header{flex-wrap:wrap;border-radius:24px}header .badge{display:none}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
html[lang="zh-CN"] h1{letter-spacing:-.5px;line-height:1.2}
html[lang="zh-CN"] .eyebrow{letter-spacing:1px}
@media(max-width:560px){header{flex-wrap:wrap;gap:10px}header .badge{display:none}.language-control{margin-left:auto}.language-control select{max-width:118px;padding:9px}header>span:nth-child(2){letter-spacing:1px}}
@media(max-width:560px){
  main{padding:18px 14px 40px}
  header{padding:12px 16px}
  .intro{padding:40px 0 32px}
  .card{padding:26px 20px}
  footer{flex-direction:column;align-items:flex-start;gap:10px}
}

#paymentCurrency{margin-bottom:16px;cursor:pointer;color-scheme:dark}
:root[data-theme="light"] #paymentCurrency{color-scheme:light}
#paymentCurrency:disabled{opacity:.6;cursor:wait}