/* ChatGPT20x — design system v2 */
:root{
  --ink:#0a0f0d;--ink2:#1d2622;--sub:#56615c;--faint:#8b958f;
  --line:#e6e9e7;--line2:#eff2f0;--bg:#fff;--soft:#f6f8f7;--soft2:#fafbfa;
  --acc:#0c9468;--acc-d:#07734f;--acc-l:#e9f7f1;--acc-b:#bfe8d7;--glow:#34d399;--mint:#5eead4;
  --dark:#070d0b;--dark2:#0d1613;
  --warn:#9a5b00;--warnbg:#fff8eb;
  --r:14px;--r-lg:20px;
  --sh-sm:0 1px 2px rgba(10,15,13,.05);
  --sh:0 1px 2px rgba(10,15,13,.04),0 10px 28px -12px rgba(10,15,13,.14);
  --sh-lg:0 2px 4px rgba(10,15,13,.04),0 30px 70px -24px rgba(10,15,13,.30);
  --w:1180px;
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","HarmonyOS Sans SC","MiSans","Hiragino Sans GB","Microsoft YaHei UI","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --num:"SF Pro Display","Segoe UI",-apple-system,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{font:16px/1.75 var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}
a{color:var(--acc-d);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
img{max-width:100%;height:auto}
::selection{background:#c9f0df}
.hidden{display:none!important}
.center{text-align:center}
.muted{color:var(--sub)}
.hint,.small{font-size:13.5px;color:var(--faint)}
.wrap{max-width:var(--w);margin:0 auto;padding:0 24px}
.ic{width:18px;height:18px;flex:none;vertical-align:-3px}

/* ── header ── */
.hd{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(16px);-webkit-backdrop-filter:saturate(180%) blur(16px);border-bottom:1px solid rgba(10,15,13,.07)}
.hd-in{max-width:var(--w);margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:36px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink);letter-spacing:-.2px;font-family:var(--num)}
.brand:hover{text-decoration:none}
.logo{width:30px;height:30px;flex:none;border-radius:9px}
.nav{display:flex;gap:2px;flex:1;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{color:var(--sub);padding:7px 12px;border-radius:8px;font-size:14.5px;white-space:nowrap;transition:color .15s,background .15s}
.nav a:hover{color:var(--ink);text-decoration:none;background:rgba(10,15,13,.04)}
.nav a.on{color:var(--ink);font-weight:600}
.hd-r{display:flex;align-items:center;gap:6px}
.hd-link{color:var(--sub);font-size:14.5px;padding:7px 12px;white-space:nowrap}
.hd-link:hover{color:var(--ink);text-decoration:none}
.hd-cta{background:var(--ink);color:#fff;padding:8px 16px;border-radius:999px;font-size:14px;font-weight:600;white-space:nowrap;transition:transform .15s,background .15s}
.hd-cta:hover{text-decoration:none;background:#1c2521}
.hd-dark{background:rgba(7,13,11,.72);border-bottom-color:rgba(255,255,255,.07)}
.hd-dark .brand{color:#fff}
.hd-dark .nav a,.hd-dark .hd-link{color:rgba(255,255,255,.66)}
.hd-dark .nav a:hover,.hd-dark .hd-link:hover{color:#fff;background:rgba(255,255,255,.06)}
.hd-dark .hd-cta{background:#fff;color:var(--ink)}
.hd-dark .hd-cta:hover{background:#e8f6f0}
@media(max-width:900px){
  .hd-in{height:auto;padding:10px 16px 0;gap:0;flex-wrap:wrap}
  .brand{height:40px}
  .hd-r{margin-left:auto}
  .nav{order:3;flex-basis:100%;margin:6px -16px 0;padding:0 10px 8px}
  .nav a{padding:6px 10px;font-size:14px}
}

/* ── buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:12px;border:1px solid var(--line);background:#fff;color:var(--ink);font-size:15px;font-weight:600;cursor:pointer;text-align:center;font-family:inherit;line-height:1.4;transition:background .15s,border-color .15s,transform .15s,box-shadow .15s}
.btn:hover{text-decoration:none;border-color:#cfd5d2}
.btn:active{transform:translateY(1px)}
.btn .ic{width:17px;height:17px}
.btn.pri{background:var(--ink);border-color:var(--ink);color:#fff}
.btn.pri:hover{background:#1c2521}
.btn.acc{background:linear-gradient(180deg,#10a472,#0b8a5f);border-color:#0a8159;color:#fff;box-shadow:0 1px 0 rgba(255,255,255,.18) inset,0 6px 16px -6px rgba(12,148,104,.55)}
.btn.acc:hover{background:linear-gradient(180deg,#0f9a6b,#087a53)}
.btn.soft{background:var(--soft);border-color:var(--line2)}
.btn.soft:hover{background:var(--ink);border-color:var(--ink);color:#fff}
.btn.inv{background:#fff;border-color:#fff;color:var(--ink);box-shadow:0 8px 24px -8px rgba(52,211,153,.45)}
.btn.inv:hover{background:#ecfbf4}
.btn.ghost{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.18);color:#fff}
.btn.ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.3)}
.btn.block{display:flex;width:100%}
.btn.lg{padding:13px 22px;font-size:16px;border-radius:14px}
.btn:disabled{opacity:.55;cursor:default;transform:none}

/* ── hero (home) ── */
.hero{position:relative;background:var(--dark);color:#fff;overflow:hidden;margin-top:-65px;padding-top:65px}
.hero-bg{position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(52% 60% at 78% 18%,rgba(16,185,129,.30),transparent 62%),
    radial-gradient(38% 46% at 8% 92%,rgba(45,212,191,.13),transparent 60%),
    radial-gradient(30% 30% at 50% 0%,rgba(94,234,212,.10),transparent 70%)}
.hero-bg:after{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:56px 56px;background-position:-1px -1px;
  -webkit-mask-image:radial-gradient(ellipse 80% 70% at 60% 20%,#000 25%,transparent 75%);mask-image:radial-gradient(ellipse 80% 70% at 60% 20%,#000 25%,transparent 75%)}
.hero-in{position:relative;max-width:var(--w);margin:0 auto;padding:84px 24px 56px;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:56px;align-items:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:5px 8px 5px 12px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.85);font-size:13.5px;transition:background .15s,border-color .15s}
.pill:hover{text-decoration:none;background:rgba(255,255,255,.1);border-color:rgba(94,234,212,.35)}
.pill-dot{width:7px;height:7px;border-radius:50%;background:var(--glow);box-shadow:0 0 0 4px rgba(52,211,153,.18)}
.pill-arr{display:inline-flex;width:22px;height:22px;border-radius:50%;background:rgba(255,255,255,.08);align-items:center;justify-content:center}
.pill-arr .ic{width:13px;height:13px}
.hero h1{margin-top:22px;font-weight:700;letter-spacing:-.035em;line-height:1.08}
.h1-a{display:block;font-size:60px;font-family:var(--num),var(--font)}
.h1-b{display:block;margin-top:14px;font-size:32px;letter-spacing:-.01em;line-height:1.3;background:linear-gradient(92deg,#a7f3d0 0%,#5eead4 45%,#34d399 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .lead{margin-top:22px;font-size:17.5px;line-height:1.8;color:rgba(255,255,255,.68);max-width:580px}
.hero .acts,.final .acts{margin-top:30px;display:flex;gap:12px;flex-wrap:wrap}
.hero-proof{list-style:none;margin-top:26px;display:flex;flex-wrap:wrap;gap:8px 22px;font-size:14px;color:rgba(255,255,255,.62)}
.hero-proof li{display:flex;align-items:center;gap:7px}
.hero-proof .ic{color:var(--glow);width:16px;height:16px}

/* hero visual: 订阅页示意 */
.hero-visual{position:relative;padding:12px 0 44px 28px}
.mock{position:relative;border-radius:18px;background:#fff;color:var(--ink);box-shadow:0 0 0 1px rgba(255,255,255,.12),0 40px 90px -30px rgba(0,0,0,.7),0 0 80px -20px rgba(52,211,153,.35);overflow:hidden;transform:perspective(1600px) rotateY(-7deg) rotateX(2deg);transform-origin:left center}
.mock-bar{display:flex;align-items:center;gap:6px;padding:12px 14px;background:#f5f7f6;border-bottom:1px solid var(--line)}
.mock-bar i{width:10px;height:10px;border-radius:50%;background:#e1e5e3}
.mock-bar i:first-child{background:#ff6159}.mock-bar i:nth-child(2){background:#ffbd2e}.mock-bar i:nth-child(3){background:#28c941}
.mock-bar span{margin-left:10px;font-size:12.5px;color:var(--faint)}
.mock-body{padding:22px 22px 24px}
.mock-plan{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-radius:14px;background:linear-gradient(135deg,#f0fbf6,#e6f7ef);border:1px solid var(--acc-b)}
.mock-plan small{display:block;font-size:12px;color:var(--sub)}
.mock-plan b{font-size:20px;letter-spacing:-.3px;font-family:var(--num),var(--font)}
.mock-plan em{font-style:normal;display:inline-flex;align-items:center;gap:4px;font-size:12.5px;font-weight:600;color:var(--acc-d);background:#fff;border:1px solid var(--acc-b);padding:3px 10px 3px 7px;border-radius:999px}
.mock-plan em .ic{width:14px;height:14px}
.mock-row{display:flex;justify-content:space-between;padding:13px 2px;border-bottom:1px solid var(--line2);font-size:14px}
.mock-row span{color:var(--faint)}
.mock-row b{font-weight:600;font-family:var(--num),var(--font)}
.mock-meter{margin-top:16px;font-size:12.5px;color:var(--faint)}
.mock-meter .bar{margin-top:7px;height:7px;border-radius:9px;background:var(--line2);overflow:hidden}
.mock-meter .bar i{display:block;height:100%;width:38%;border-radius:9px;background:linear-gradient(90deg,var(--acc),var(--mint))}
.mock-float{position:absolute;left:-10px;bottom:0;width:236px;padding:14px 16px;border-radius:16px;background:rgba(13,22,19,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.12);box-shadow:0 24px 50px -16px rgba(0,0,0,.7)}
.mf-h{display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:600;color:#fff;margin-bottom:8px}
.mf-h small{font-weight:400;color:rgba(255,255,255,.45);font-family:var(--num)}
.mock-float ol{list-style:none}
.mock-float li{position:relative;padding:4px 0 4px 24px;font-size:13px;color:rgba(255,255,255,.72)}
.mock-float li:before{content:"";position:absolute;left:3px;top:10px;width:11px;height:11px;border-radius:50%;border:1.5px solid rgba(255,255,255,.3)}
.mock-float li.done:before{background:var(--glow);border-color:var(--glow);box-shadow:0 0 0 3px rgba(52,211,153,.18)}
.mock-float li.now{color:#fff}
.mock-float li.now:before{border-color:var(--glow);animation:pulse 1.8s ease-in-out infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(52,211,153,.5)}50%{box-shadow:0 0 0 5px rgba(52,211,153,0)}}

.facts{position:relative;max-width:var(--w);margin:0 auto;padding:0 24px 64px;display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.fact{display:flex;gap:14px;align-items:flex-start;padding:20px 22px;border-top:1px solid rgba(255,255,255,.1)}
.fact+.fact{border-left:1px solid rgba(255,255,255,.08)}
.fact .ic{width:22px;height:22px;color:var(--glow);margin-top:3px}
.fact b{display:block;font-size:18px;letter-spacing:-.2px;font-family:var(--num),var(--font)}
.fact span{font-size:13.5px;color:rgba(255,255,255,.55)}
@media(max-width:900px){.hero{margin-top:0;padding-top:0}}
@media(max-width:1020px){
  .hero-in{grid-template-columns:1fr;gap:36px;padding-top:64px}
  .hero-visual{max-width:520px;padding-left:18px}
  .facts{grid-template-columns:1fr 1fr}
  .fact:nth-child(3){border-left:0}
}
@media(max-width:640px){
  .hero-in{padding:44px 20px 36px}
  .h1-a{font-size:40px}
  .h1-b{font-size:22px;margin-top:10px}
  .hero .lead{font-size:16px}
  .hero .acts .btn{flex:1 1 100%}
  .hero-visual{display:none}
  .facts{padding:0 20px 36px}
  .fact{padding:16px 10px 16px 0}
  .fact+.fact{border-left:0}
  .fact:nth-child(2n){padding-left:14px;border-left:1px solid rgba(255,255,255,.08)}
  .fact b{font-size:16px}
}

/* ── sections ── */
.sec{max-width:var(--w);margin:0 auto;padding:104px 24px}
.sec.band{max-width:none;background:var(--soft2);border-top:1px solid var(--line2);border-bottom:1px solid var(--line2)}
.sec.band>*{max-width:calc(var(--w) - 48px);margin-left:auto;margin-right:auto}
.sec-hd{margin-bottom:44px;max-width:720px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--acc);letter-spacing:.08em}
.eyebrow:before{content:"";width:18px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--acc),var(--mint))}
.sec-hd h2,.sec>h2{margin-top:10px;font-size:40px;line-height:1.2;letter-spacing:-.03em;font-weight:700}
.sec-hd .sub,.sec>.sub{margin-top:14px;font-size:17px;color:var(--sub);line-height:1.8}
@media(max-width:640px){.sec{padding:68px 20px}.sec-hd{margin-bottom:30px}.sec-hd h2,.sec>h2{font-size:28px}.sec-hd .sub{font-size:15.5px}}

/* price cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media(max-width:900px){.cards{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.cards{grid-template-columns:1fr;gap:12px}.card{padding:20px 20px 18px}.card .price{margin-top:12px}.card .price b{font-size:38px}.card .quota{margin:12px 0 14px;padding-top:12px}}
.card{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:26px 24px 22px;display:flex;flex-direction:column;box-shadow:var(--sh-sm);transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--sh);border-color:#d6dcd9}
.card-top{display:flex;align-items:center;justify-content:space-between;gap:8px}
.card h3{font-size:16.5px;font-weight:650;letter-spacing:-.1px}
.card .tag{font-size:12px;font-weight:600;padding:3px 10px;border-radius:999px;background:linear-gradient(90deg,rgba(52,211,153,.2),rgba(94,234,212,.2));color:#a7f3d0;border:1px solid rgba(94,234,212,.3);white-space:nowrap}
.card .for{font-size:13.5px;color:var(--faint);margin-top:2px}
.card .price{margin-top:18px;display:flex;align-items:baseline;gap:2px;font-family:var(--num),var(--font)}
.card .cur{font-size:20px;font-weight:600}
.card .price b{font-size:44px;line-height:1;font-weight:700;letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.card .price small{margin-left:4px;color:var(--faint);font-size:14px}
.card .usd{margin-top:8px;font-size:13px;color:var(--faint)}
.card .quota{font-size:14px;color:var(--sub);margin:16px 0 22px;padding-top:16px;border-top:1px dashed var(--line);flex:1}
.card .btn{width:100%}
.card.hot{background:radial-gradient(120% 80% at 100% 0%,rgba(16,185,129,.22),transparent 55%),var(--dark2);border-color:var(--dark2);color:#fff;box-shadow:var(--sh-lg)}
.card.hot:before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;background:linear-gradient(160deg,rgba(94,234,212,.7),rgba(94,234,212,0) 45%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;pointer-events:none}
.card.hot .for,.card.hot .usd,.card.hot .price small{color:rgba(255,255,255,.55)}
.card.hot .quota{color:rgba(255,255,255,.72);border-top-color:rgba(255,255,255,.14)}

/* steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.steps li{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:24px 22px 22px;box-shadow:var(--sh-sm)}
.step-n{display:inline-flex;align-items:center;justify-content:center;height:30px;padding:0 10px;border-radius:9px;background:var(--ink);color:#fff;font:600 13px/1 var(--num);letter-spacing:.04em}
.steps li:first-child .step-n{background:linear-gradient(135deg,#10a472,#0b8a5f)}
.steps b{display:block;margin-top:16px;font-size:17px;letter-spacing:-.1px}
.steps p{margin-top:6px;font-size:14.5px;color:var(--sub);line-height:1.75}
@media(min-width:901px){.steps li:not(:last-child):after{content:"";position:absolute;top:38px;right:-21px;width:22px;height:1px;background:repeating-linear-gradient(90deg,#b9c2be 0 4px,transparent 4px 8px)}}
@media(max-width:900px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.steps{grid-template-columns:1fr;gap:12px}}

.two{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media(max-width:760px){.two{grid-template-columns:1fr}}
.box{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:30px 28px;box-shadow:var(--sh-sm)}
.box-ic{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;background:var(--acc-l);color:var(--acc);margin-bottom:18px}
.box-ic.warn{background:var(--warnbg);color:#c27803}
.box-ic .ic{width:22px;height:22px}
.box h3{font-size:19px;letter-spacing:-.2px;margin-bottom:10px}
.box p+p{margin-top:10px}
.box ul{list-style:none;color:var(--sub)}
.box li{position:relative;padding-left:18px;margin:8px 0}
.box li:before{content:"";position:absolute;left:2px;top:.72em;width:6px;height:6px;border-radius:50%;background:#d7a54a}

/* compare teaser */
.compare{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;padding:48px;border-radius:28px;background:radial-gradient(70% 90% at 100% 0%,rgba(16,185,129,.10),transparent 60%),linear-gradient(180deg,#fbfdfc,#f4f8f6);border:1px solid var(--line);color:var(--ink);transition:box-shadow .2s,border-color .2s}
.compare:hover{text-decoration:none;box-shadow:var(--sh);border-color:#d6dcd9}
.compare h2{margin-top:10px;font-size:34px;letter-spacing:-.03em;line-height:1.2}
.compare .sub{margin-top:14px;color:var(--sub);font-size:16px}
.compare .muted{margin-top:12px;font-size:15px}
.compare-go{display:inline-flex;align-items:center;gap:6px;margin-top:22px;font-weight:600;color:var(--acc-d)}
.compare:hover .compare-go .ic{transform:translateX(3px)}
.compare-go .ic{transition:transform .2s}
.compare-vis{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh);overflow:hidden}
.cv-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:14px 20px;border-top:1px solid var(--line2);font-size:14px}
.cv-row span:first-child{display:flex;align-items:center;gap:9px;font-weight:600}
.cv-row span:last-child{color:var(--sub)}
.cv-row .ic{color:var(--acc)}
.cv-h{border-top:0;background:var(--soft);font-size:12.5px;color:var(--faint);padding:10px 20px}
.cv-h span:first-child{font-weight:500}
@media(max-width:860px){.compare{grid-template-columns:1fr;padding:30px 22px;gap:28px;border-radius:22px}.compare h2{font-size:26px}}

/* faq grid */
.qa-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.qa{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:24px 26px}
.qa h3{font-size:17px;letter-spacing:-.1px;line-height:1.5}
.qa p{margin-top:8px;font-size:15px;color:var(--sub)}
@media(max-width:760px){.qa-grid{grid-template-columns:1fr;gap:12px}.qa{padding:20px}}
.more-link{display:inline-flex;align-items:center;gap:6px;font-weight:600}

/* final cta */
.final{position:relative;display:flex;align-items:center;justify-content:space-between;gap:40px;padding:56px;border-radius:28px;overflow:hidden;color:#fff;background:radial-gradient(60% 120% at 100% 0%,rgba(16,185,129,.35),transparent 60%),radial-gradient(40% 80% at 0% 100%,rgba(45,212,191,.12),transparent 60%),var(--dark)}
.final:after{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:44px 44px;-webkit-mask-image:linear-gradient(90deg,transparent,#000);mask-image:linear-gradient(90deg,transparent,#000)}
.final-copy{position:relative;z-index:1;max-width:640px}
.final h2{font-size:36px;letter-spacing:-.03em;line-height:1.2}
.final p{margin-top:12px;color:rgba(255,255,255,.68)}
.final p a{color:#a7f3d0}
.final-qr{position:relative;z-index:1;flex:none;background:#fff;border-radius:18px;padding:14px 14px 10px;text-align:center;box-shadow:0 20px 50px -20px rgba(0,0,0,.6)}
.final-qr img{display:block;border-radius:8px}
.final-qr span{display:block;margin-top:6px;font-size:12.5px;color:var(--sub)}
@media(max-width:760px){.final{flex-direction:column;align-items:flex-start;padding:34px 22px;border-radius:22px}.final h2{font-size:26px}.final .acts .btn{flex:1 1 100%}.final-qr{display:none}}

/* ── article ── */
.art-hd{background:radial-gradient(60% 120% at 90% 0%,rgba(16,185,129,.08),transparent 60%),linear-gradient(180deg,var(--soft),#fff);border-bottom:1px solid var(--line2)}
.art-hd-in{max-width:var(--w);margin:0 auto;padding:36px 24px 34px}
.crumbs{font-size:13.5px;color:var(--faint);display:flex;flex-wrap:wrap;gap:0 2px}
.crumbs a{color:var(--faint)}
.crumbs a:hover{color:var(--ink)}
.crumbs i{font-style:normal;margin:0 7px;color:#c5ccc8}
.crumbs span{color:var(--sub)}
.art-hd h1{margin-top:16px;font-size:42px;line-height:1.22;letter-spacing:-.03em;max-width:880px;font-weight:700}
.art-hd .meta{margin-top:18px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 20px;font-size:14px;color:var(--faint)}
.art-hd .au{display:inline-flex;align-items:center;gap:8px;color:var(--ink2);font-weight:600}
.art-hd .au .logo{width:22px;height:22px;border-radius:6px}
.art-grid{max-width:var(--w);margin:0 auto;padding:44px 24px 24px;display:grid;grid-template-columns:minmax(0,1fr) 288px;gap:72px;align-items:start}
.prose{max-width:760px;font-size:16.5px;line-height:1.9;color:#1b2420}
.prose>*+*{margin-top:1.1em}
.prose h2{font-size:27px;line-height:1.35;margin-top:2.2em;letter-spacing:-.025em;scroll-margin-top:90px;color:var(--ink)}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19.5px;line-height:1.45;margin-top:1.8em;letter-spacing:-.01em;color:var(--ink)}
.prose a{text-decoration:underline;text-decoration-color:rgba(12,148,104,.35);text-underline-offset:3px}
.prose a:hover{text-decoration-color:var(--acc)}
.prose a.btn{text-decoration:none}
.prose b,.prose strong{color:var(--ink);font-weight:650}
.prose ul,.prose ol{padding-left:1.35em}
.prose li{margin:.45em 0;padding-left:.2em}
.prose li::marker{color:var(--acc)}
.prose blockquote{border-left:3px solid var(--acc);background:var(--soft);padding:14px 18px;border-radius:0 12px 12px 0;color:var(--sub)}
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:16px;box-shadow:var(--sh-sm)}
.prose table{width:100%;border-collapse:collapse;font-size:14.5px;line-height:1.65}
.prose th,.prose td{padding:12px 14px;text-align:left;vertical-align:top;min-width:96px;border-bottom:1px solid var(--line2)}
.prose th{background:var(--soft);font-weight:600;white-space:nowrap;font-size:13.5px;color:var(--sub)}
.prose tr:last-child td{border-bottom:0}
@media(max-width:640px){.prose table{font-size:14px;min-width:620px}.prose th,.prose td{padding:11px 12px;min-width:110px}.tbl-wrap{margin-right:-20px;border-radius:14px 0 0 14px;border-right:0}}
.prose td:first-child{font-weight:600;color:var(--ink)}
.prose tbody tr:hover{background:#fafcfb}
.prose .note,.note{background:var(--acc-l);border:1px solid var(--acc-b);border-radius:12px;padding:12px 16px;font-size:14.5px;color:#0f4a37;margin-top:16px}
.note.warn{background:var(--warnbg);border-color:#f3dcae;color:var(--warn)}
.prose .cards{margin-top:1.4em}
.prose .cs-qr{display:block;margin:10px auto;border:1px solid var(--line);border-radius:14px;padding:8px;background:#fff}
.toc-m{display:none}
.art-side{position:relative;height:100%}
.side-sticky{position:sticky;top:88px;display:flex;flex-direction:column;gap:16px}
.side-h{font-size:12.5px;font-weight:600;color:var(--faint);letter-spacing:.06em;margin-bottom:8px}
.toc{display:flex;flex-direction:column;border-left:1px solid var(--line);padding-left:2px}
.toc .side-h{padding-left:14px}
.toc a{display:block;padding:5px 0 5px 14px;margin-left:-3px;border-left:2px solid transparent;font-size:13.5px;line-height:1.55;color:var(--sub)}
.toc a:hover{color:var(--ink);border-left-color:var(--acc);text-decoration:none}
.side-card{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;box-shadow:var(--sh-sm)}
.qk{display:flex;justify-content:space-between;align-items:baseline;padding:9px 10px;margin:0 -6px;border-radius:10px;color:var(--ink);font-size:14px}
.qk:hover{background:var(--soft);text-decoration:none}
.qk b{font-family:var(--num),var(--font);font-size:16px}
.qk small{font-weight:400;color:var(--faint);font-size:12px}
.side-more{display:flex;align-items:center;gap:4px;margin-top:8px;padding-top:10px;border-top:1px solid var(--line2);font-size:13.5px;font-weight:600}
.side-more .ic{width:15px;height:15px}
.side-kf{display:flex;gap:12px;align-items:center;color:var(--ink)}
.side-kf:hover{text-decoration:none;border-color:var(--acc-b)}
.side-kf img{border-radius:8px;flex:none}
.side-kf b{display:block;font-size:14.5px}
.side-kf small{display:block;font-size:12.5px;color:var(--faint);line-height:1.5;margin-top:2px}
@media(max-width:1020px){
  .art-grid{grid-template-columns:minmax(0,1fr);gap:0}
  .art-side{display:none}
  .prose{max-width:none}
  .toc-m{display:block;border:1px solid var(--line);border-radius:14px;background:var(--soft2);padding:0 16px;margin-bottom:1.6em}
  .toc-m summary{cursor:pointer;padding:12px 0;font-weight:600;font-size:14.5px;list-style:none}
  .toc-m summary::-webkit-details-marker{display:none}
  .toc-m summary:after{content:"＋";float:right;color:var(--faint)}
  .toc-m[open] summary:after{content:"－"}
  .toc-m a{display:block;padding:7px 0;border-top:1px solid var(--line2);font-size:14px;color:var(--sub);text-decoration:none}
}
@media(max-width:640px){
  .art-hd-in{padding:24px 20px 24px}
  .art-hd h1{font-size:28px}
  .art-grid{padding:28px 20px 16px}
  .prose{font-size:16px}
  .prose h2{font-size:22px}
  .prose h3{font-size:18px}
}
.cta-box{max-width:var(--w);margin:48px auto 0;padding:0 24px}
.cta-in{border-radius:28px;padding:48px;background:radial-gradient(60% 90% at 100% 0%,rgba(16,185,129,.09),transparent 60%),var(--soft2);border:1px solid var(--line)}
.cta-in .sec-hd{margin-bottom:28px}
.cta-in h2{margin-top:8px;font-size:32px;letter-spacing:-.03em;line-height:1.2}
.cta-in .sec-hd p{margin-top:10px;color:var(--sub)}
.cta-in .small{margin-top:20px}
@media(max-width:640px){.cta-box{padding:0 16px}.cta-in{padding:28px 18px;border-radius:22px}.cta-in h2{font-size:24px}}

/* ── app pages ── */
.app{max-width:560px;padding-top:40px;padding-bottom:56px}
.app-wide{max-width:1040px}
.pg-app{background:var(--soft2)}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:30px;box-shadow:var(--sh)}
.panel h1{font-size:24px;letter-spacing:-.02em;margin-bottom:6px}
.panel.wide{margin-top:16px}
.app>.hint{margin-top:18px}
.amt{font-size:34px;font-weight:700;color:var(--ink);margin:10px 0 4px;letter-spacing:-.03em;font-family:var(--num),var(--font)}
.field{margin-top:22px}
.field>label{display:block;font-weight:600;margin-bottom:8px;font-size:14.5px}
.field input{width:100%;padding:12px 14px;border:1px solid #d9dfdc;border-radius:12px;font-size:16px;font-family:inherit;background:#fff;transition:border-color .15s,box-shadow .15s}
.field input:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 4px rgba(12,148,104,.12)}
.field .hint{margin-top:6px}
.pay-one{display:flex;align-items:center;gap:12px;padding:13px 14px;border:1.5px solid var(--ink);border-radius:12px;background:#fff}
.ali{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:8px;background:#1677ff;color:#fff;font-weight:700;font-size:15px;flex:none}
.pay-one b{font-size:15.5px}
.pay-one small{display:block;font-size:12.5px;color:var(--faint);line-height:1.4}
.pay-one .ck{margin-left:auto;width:22px;height:22px;border-radius:50%;background:var(--ink);color:#fff;display:flex;align-items:center;justify-content:center}
.pay-one .ck .ic{width:14px;height:14px}
.check-row{display:flex;gap:10px;align-items:flex-start;margin:20px 0;cursor:pointer;font-size:15px;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--soft2)}
.check-row input{margin-top:6px;width:16px;height:16px;accent-color:var(--ink)}
.qr-box{text-align:center;padding:8px 0 16px}
.qr-box img{margin:14px auto;display:block;border:1px solid var(--line);border-radius:14px;padding:8px;background:#fff}
.ok-mark{width:60px;height:60px;border-radius:50%;background:linear-gradient(135deg,#10a472,#0b8a5f);color:#fff;display:flex;align-items:center;justify-content:center;margin:0 auto 14px;box-shadow:0 10px 24px -8px rgba(12,148,104,.6)}
.ok-mark .ic{width:30px;height:30px;stroke-width:2.4}
.cs-qr{display:block;margin:18px auto 6px;border:1px solid var(--line);border-radius:14px;padding:6px;background:#fff}
/* checkout */
.co{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:28px;align-items:start}
.co-sum{position:sticky;top:88px;padding:30px;border-radius:var(--r-lg);color:#fff;background:radial-gradient(90% 70% at 100% 0%,rgba(16,185,129,.28),transparent 60%),var(--dark2);box-shadow:var(--sh-lg)}
.co-sum .eyebrow{color:var(--glow)}
.co-sum h1{margin-top:10px;font-size:26px;letter-spacing:-.02em;line-height:1.3}
.co-sum .muted{color:rgba(255,255,255,.6);margin-top:6px;font-size:14.5px}
.co-sum .amt{color:#fff;font-size:40px;margin-top:18px}
.co-list{list-style:none;margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}
.co-list li{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:rgba(255,255,255,.78);margin:10px 0}
.co-list .ic{color:var(--glow);margin-top:4px;width:16px;height:16px}
.co-sum .note.warn{margin-top:16px}
.co .panel h2{font-size:19px;letter-spacing:-.01em}
@media(max-width:860px){.co{grid-template-columns:1fr;gap:16px}.co-sum{position:static;padding:24px}.co-sum .amt{font-size:34px}.co-list{display:none}}
.trust-row{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 18px;margin-top:18px;font-size:13px;color:var(--faint)}
.trust-row span{display:inline-flex;align-items:center;gap:5px}
.trust-row .ic{width:14px;height:14px;color:var(--acc)}
.admin{max-width:1000px;margin:0 auto}
.row-between{display:flex;justify-content:space-between;align-items:center}
.row-wrap{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-top:16px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.stat span{display:block;font-size:13px;color:var(--faint)}
.stat b{font-size:22px}
.scroll-x{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:13.5px;margin-top:10px}
.tbl th,.tbl td{padding:8px;border-top:1px solid var(--line);text-align:left;white-space:nowrap}

/* ── footer ── */
.ft{background:var(--dark);color:rgba(255,255,255,.6);margin-top:104px}
.pg-app .ft{margin-top:40px}
.ft-in{max-width:var(--w);margin:0 auto;padding:64px 24px 40px;display:grid;grid-template-columns:2.2fr 1fr 1fr 1fr;gap:32px}
.ft .brand{color:#fff}
.ft-about p{font-size:14px;margin-top:14px;max-width:340px;line-height:1.8}
.ft-badges{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.ft-badges li{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;padding:5px 10px;border-radius:999px;border:1px solid rgba(255,255,255,.1);background:rgba(255,255,255,.03);color:rgba(255,255,255,.72)}
.ft-badges .ic{width:14px;height:14px;color:var(--glow)}
.ft-col h4{font-size:13px;font-weight:600;color:#fff;margin-bottom:12px;letter-spacing:.04em}
.ft-col a{display:block;color:rgba(255,255,255,.58);font-size:14px;margin:8px 0}
.ft-col a:hover{color:#fff;text-decoration:none}
.ft-bot{max-width:var(--w);margin:0 auto;padding:20px 24px 32px;border-top:1px solid rgba(255,255,255,.08);display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 24px;font-size:12.5px;color:rgba(255,255,255,.4)}
@media(max-width:760px){.ft{margin-top:64px}.ft-in{grid-template-columns:1fr 1fr;padding:44px 20px 28px}.ft-about{grid-column:1/-1}.ft-bot{padding:18px 20px 90px}}

/* ── 右下角企业微信客服 ── */
.kf{position:fixed;right:22px;bottom:22px;z-index:60;display:flex;align-items:center;gap:10px;padding:8px 18px 8px 8px;border-radius:999px;background:var(--ink);color:#fff;font-size:14.5px;font-weight:600;box-shadow:0 0 0 1px rgba(255,255,255,.08) inset,0 14px 34px -10px rgba(10,15,13,.55),0 4px 10px -4px rgba(12,148,104,.4);transition:transform .2s,box-shadow .2s}
.kf:hover{text-decoration:none;transform:translateY(-2px);box-shadow:0 0 0 1px rgba(255,255,255,.1) inset,0 18px 40px -10px rgba(10,15,13,.6),0 6px 16px -4px rgba(12,148,104,.5)}
.kf-ic{position:relative;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,#10b981,#0b8a5f);display:flex;align-items:center;justify-content:center}
.kf-ic .ic{width:19px;height:19px}
.kf-dot{position:absolute;right:0;top:0;width:10px;height:10px;border-radius:50%;background:#4ade80;border:2px solid var(--ink)}
.kf-pop{position:absolute;right:0;bottom:calc(100% + 12px);width:200px;padding:16px 16px 14px;border-radius:18px;background:#fff;color:var(--ink);text-align:center;box-shadow:var(--sh-lg),0 0 0 1px rgba(10,15,13,.06);opacity:0;visibility:hidden;transform:translateY(6px);transition:opacity .18s,transform .18s,visibility .18s}
.kf-pop img{display:block;margin:0 auto;border-radius:8px}
.kf-pop b{display:block;margin-top:8px;font-size:14px}
.kf-pop small{display:block;font-size:12px;font-weight:400;color:var(--faint);line-height:1.5}
@media(hover:hover) and (min-width:900px){.kf:hover .kf-pop{opacity:1;visibility:visible;transform:none}}
@media(max-width:640px){.kf{right:14px;bottom:calc(14px + env(safe-area-inset-bottom));padding:6px 14px 6px 6px;font-size:13.5px}.kf-ic{width:32px;height:32px}.kf-pop{display:none}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}html{scroll-behavior:auto}}