/* TradeWhy.ai 官网样式（2026-10 线性版）：首页与全部子页共用。
   子页面沿用 site-v5 的类名（shell / page-lead / form-box / faq …），app.js 依赖这些类名与元素 id，改名前先查 app.js。
   /learn/ 文章栏目（tools/growth/learn_build.mjs）也引用本文件与帮助页的类名（help-layout / help-index / qa-related …）。 */
:root{
  --bg:#08090A;
  --bg-1:#0D0E10;
  --panel:#121315;
  --panel-2:#17181B;
  --line:rgba(255,255,255,.07);
  --line-2:rgba(255,255,255,.12);
  --line-3:rgba(255,255,255,.2);
  --t1:#F7F8F8;
  --t2:#C9CED6;
  --t3:#8A8F98;
  --t4:#62666D;
  --accent:#8B5CF6;
  --accent-2:#A78BFA;
  --accent-soft:rgba(139,92,246,.12);
  --ok:#4CB782;
  --warn:#F2994A;
  --bad:#EB5757;
  --sans:"Inter","SF Pro Display","Segoe UI Variable Display","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  --mono:"JetBrains Mono","SF Mono","Cascadia Mono",Consolas,Menlo,"PingFang SC","Microsoft YaHei",sans-serif;
  --wrap:1200px;
  --gutter:32px;
  --rail:72px;
  --nav-h:60px;
  --ease:cubic-bezier(.2,.7,.2,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{
  margin:0;background:var(--bg);color:var(--t1);font-family:var(--sans);
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
body.menu-lock{overflow:hidden}
::selection{background:rgba(139,92,246,.4);color:#fff}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;background:none;border:none;padding:0}
img,video{display:block;max-width:100%}
code{font-family:var(--mono);font-size:.9em;color:var(--t2);background:var(--panel);border:1px solid var(--line);padding:1px 6px;border-radius:5px;overflow-wrap:anywhere}
:focus-visible{outline:2px solid var(--accent-2);outline-offset:3px;border-radius:6px}
.wrap,.shell{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.mono{font-family:var(--mono)}
.sr,.screen-reader{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip-link{position:absolute;left:12px;top:-60px;z-index:100;background:var(--t1);color:#08090A;font-weight:600;font-size:14px;padding:8px 14px;border-radius:8px;transition:top .15s}
.skip-link:focus{top:12px}
[hidden]{display:none!important}

/* ---------- 文字 ---------- */
.label{font-size:13px;color:var(--t3);display:flex;align-items:center;gap:8px}
.label .tag,.tag{font-size:11px;color:var(--accent-2);border:1px solid rgba(139,92,246,.35);background:var(--accent-soft);padding:1px 7px;border-radius:999px;font-weight:500}
.body-large{margin:22px 0 0;max-width:680px;font-size:clamp(15.5px,1.5vw,17px);line-height:1.8;color:var(--t3)}
.body-large strong,.body-large b{color:var(--t2);font-weight:500}
.body-medium{margin:0;font-size:15px;line-height:1.8;color:var(--t3)}
.small{margin:12px 0 0;font-size:13px;line-height:1.75;color:var(--t4)}
.small a,.body-large a,.body-medium a,.faq-answer a,.contact-card a,.release-row a{color:var(--t2);text-decoration:underline;text-decoration-color:var(--line-3);text-underline-offset:3px}
.small a:hover,.body-large a:hover,.body-medium a:hover,.faq-answer a:hover,.contact-card a:hover{color:#fff}
.small strong{color:var(--t2);font-weight:500}

/* ---------- 按钮（.pill 是 site-v5 的旧名，app.js 生成的内容里也用它） ---------- */
.btn,.pill{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:40px;padding:0 18px;border-radius:8px;font-size:14px;font-weight:600;white-space:nowrap;
  background:rgba(255,255,255,.04);border:1px solid var(--line-2);color:var(--t1);
  transition:background .15s,border-color .15s,color .15s,opacity .15s;
}
.btn:hover,.pill:hover{background:rgba(255,255,255,.08);border-color:var(--line-3)}
.btn-primary,.pill.white{background:var(--t1);border-color:var(--t1);color:#08090A}
.btn-primary:hover,.pill.white:hover{background:#fff;border-color:#fff}
.btn-ghost{background:rgba(255,255,255,.04);border:1px solid var(--line-2);color:var(--t1)}
.btn-sm,.pill.compact{height:32px;padding:0 12px;font-size:13px;border-radius:7px}
.btn-lg{height:46px;padding:0 22px;font-size:15px;border-radius:10px}
.btn .arr,.pill .arr{transition:transform .2s var(--ease)}
.btn:hover .arr,.pill:hover .arr{transform:translateX(2px)}
.btn:disabled,.pill:disabled{opacity:.5;cursor:not-allowed}
.hero-actions,.hero-cta{position:relative;margin-top:32px;display:flex;flex-wrap:wrap;align-items:center;gap:12px}

/* ---------- 顶栏 ---------- */
.progress{position:fixed;top:0;left:0;height:2px;width:100%;z-index:80;pointer-events:none;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));transform-origin:0 50%;transform:scaleX(0)}
.site-nav{
  position:sticky;top:0;z-index:70;
  background:rgba(8,9,10,.76);backdrop-filter:blur(14px) saturate(150%);-webkit-backdrop-filter:blur(14px) saturate(150%);
  border-bottom:1px solid transparent;transition:border-color .2s;
}
.site-nav.scrolled{border-bottom-color:var(--line)}
.nav-row{height:var(--nav-h);display:flex;align-items:center;gap:24px}
.wordmark{display:inline-flex;align-items:center;flex:none}
.wordmark img{display:block;height:17px;width:auto}
.site-foot .wordmark img{height:18px}
.nav-center{display:flex;gap:2px;flex:1;min-width:0}
.nav-center a{font-size:13.5px;color:var(--t3);padding:6px 10px;border-radius:6px;white-space:nowrap;transition:color .15s}
.nav-center a:hover,.nav-center a.on,.nav-center a[aria-current="page"]{color:var(--t1)}
.nav-tools{display:flex;align-items:center;gap:8px;margin-left:auto}
.menu-button{display:none;position:relative;width:36px;height:36px;border-radius:8px;border:1px solid var(--line-2)}
.menu-button span,.menu-button span::before,.menu-button span::after{position:absolute;left:10px;width:14px;height:1.6px;border-radius:2px;background:var(--t1);transition:transform .2s var(--ease),opacity .2s}
.menu-button span{top:17px}
.menu-button span::before,.menu-button span::after{content:"";left:0}
.menu-button span::before{top:-5px}
.menu-button span::after{top:5px}
.menu-button.open span{background:transparent}
.menu-button.open span::before{transform:translateY(5px) rotate(45deg)}
.menu-button.open span::after{transform:translateY(-5px) rotate(-45deg)}

/* ---------- 子页页首 ---------- */
.page-lead{position:relative;padding:96px 0 24px;overflow:hidden}
.page-lead::before{content:"";position:absolute;left:50%;top:-300px;width:1100px;height:600px;transform:translateX(-50%);pointer-events:none;background:radial-gradient(closest-side,rgba(139,92,246,.13),transparent)}
.page-lead .shell{position:relative}
.page-lead h1,.closing h2,.final h2{
  margin:22px 0 0;max-width:900px;font-size:clamp(32px,4.6vw,56px);line-height:1.12;font-weight:650;letter-spacing:-.035em;
  background:linear-gradient(180deg,#fff 25%,rgba(255,255,255,.64));-webkit-background-clip:text;background-clip:text;color:transparent;
}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:13px;color:var(--t4)}
.crumbs a{color:var(--t3)}
.crumbs a:hover{color:var(--t1)}

/* ---------- 子页区块 ---------- */
.section{padding:72px 0 0}
.section-title{max-width:820px}
.section-title h2,.section h2{margin:16px 0 0;font-size:clamp(26px,3.2vw,38px);line-height:1.18;font-weight:650;letter-spacing:-.025em}
.section h3{font-size:18px;font-weight:600;letter-spacing:-.01em;line-height:1.4;margin:0}
.page-layout,.membership-row{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(0,1fr);gap:56px;align-items:start}
.flow-grid,.flow{display:grid;gap:12px;margin-top:40px}
.flow.three{grid-template-columns:repeat(3,1fr)}
.flow.four{grid-template-columns:repeat(4,1fr)}
.flow-step{padding:22px 22px 20px;border:1px solid var(--line);border-radius:12px;background:var(--bg-1)}
.flow-step>span{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--t4)}
.flow-step .num{font-family:var(--mono);font-size:11px;color:var(--accent-2)}
.flow-step h3{margin:12px 0 0;font-size:16px}
.flow-step p{margin:8px 0 0;font-size:14px;line-height:1.75;color:var(--t3)}
.closing{position:relative;margin-top:120px;padding:110px 0;border-top:1px solid var(--line);overflow:hidden}
.closing::before{content:"";position:absolute;left:50%;bottom:-320px;width:1100px;height:640px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(139,92,246,.15),transparent);pointer-events:none}
.closing .shell{position:relative}
.closing .body-large{max-width:620px}

/* 价格表 / 列表 */
.points-table,.data-table{width:100%;margin-top:32px;border-collapse:collapse;font-size:14px}
.points-table th,.points-table td,.data-table th,.data-table td{text-align:left;padding:13px 16px 13px 0;border-top:1px solid var(--line);vertical-align:top;line-height:1.65;font-weight:400}
.points-table tr:first-child th,.data-table thead th{border-top:none;color:var(--t4);font-size:12.5px;padding-top:0}
.points-table td:first-child,.data-table tbody th{color:var(--t1);font-weight:500;white-space:nowrap}
.points-table td,.data-table td{color:var(--t3)}
.points-table td:nth-child(2){color:var(--t2);white-space:nowrap;font-variant-numeric:tabular-nums}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.table-scroll .data-table{min-width:600px}
.data-table tbody th{white-space:normal;min-width:120px}
.plan-list{list-style:none;margin:20px 0 0;padding:0}
.plan-list li{position:relative;padding-left:24px;margin-bottom:11px;font-size:14px;line-height:1.65;color:var(--t3)}
.plan-list li::before{content:"";position:absolute;left:2px;top:.55em;width:9px;height:5px;border-left:1.6px solid var(--t2);border-bottom:1.6px solid var(--t2);transform:rotate(-45deg)}
.plan-list li.no::before{transform:none;width:9px;height:0;top:.8em;border-left:none;border-bottom:1.6px solid var(--t4)}
.plan-list li.no{color:var(--t4)}
.plan-list li b,.plan-list li strong{color:var(--t1);font-weight:600}
.membership-features{display:flex;flex-wrap:wrap;gap:8px;margin-top:28px}
.membership-features span{font-size:13px;color:var(--t2);padding:6px 12px;border-radius:999px;border:1px solid var(--line-2);background:rgba(255,255,255,.02)}
.side-card{padding:26px 26px 24px;border:1px solid var(--line-2);border-radius:14px;background:var(--bg-1)}

/* ---------- 表单 ---------- */
.form-box,.status-box{padding:30px 30px 28px;border:1px solid var(--line-2);border-radius:14px;background:var(--bg-1)}
.status-box{margin-top:28px}
.form-box h2{margin:14px 0 0;font-size:24px}
.form-stack{display:grid;gap:18px;margin-top:24px}
.input-group{display:grid;gap:7px}
.input-group label{font-size:13.5px;color:var(--t2);font-weight:500;display:flex;justify-content:space-between;gap:12px}
.input-group label small{font-weight:400;color:var(--t4)}
.input-group small{font-size:12.5px;color:var(--t4);line-height:1.6}
.input-group small.error,#referrerHint.error{color:#F4A3A3}
.input-group small.success,#referrerHint.success{color:var(--ok)}
input[type=text],input[type=email],input[type=search],input:not([type]),select,textarea,.search-field{
  width:100%;font:inherit;font-size:14.5px;color:var(--t1);background:var(--bg);border:1px solid var(--line-2);border-radius:8px;
  padding:10px 12px;min-height:42px;transition:border-color .15s,box-shadow .15s;-webkit-appearance:none;appearance:none;
}
select{background-image:linear-gradient(45deg,transparent 50%,var(--t3) 50%),linear-gradient(135deg,var(--t3) 50%,transparent 50%);background-position:calc(100% - 17px) 50%,calc(100% - 12px) 50%;background-size:5px 5px;background-repeat:no-repeat;padding-right:32px}
textarea{min-height:96px;resize:vertical;line-height:1.65}
input::placeholder,textarea::placeholder{color:var(--t4)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent-2);box-shadow:0 0 0 3px rgba(139,92,246,.18)}
.code-row{display:flex;gap:8px}
.code-row input{flex:1;min-width:0}
.code-row .pill{height:42px;flex:none}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.check-row{display:flex;gap:10px;align-items:flex-start;font-size:13.5px;line-height:1.7;color:var(--t3);cursor:pointer}
.check-row input{margin-top:4px;width:16px;height:16px;accent-color:var(--accent);flex:none}
.honeypot{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-message{margin:0;font-size:13.5px;line-height:1.7;color:var(--t3)}
.form-message:empty{display:none}
.form-message.error{color:#F4A3A3}
.form-message.success{color:var(--ok)}
.form-stack .pill.white,.form-stack button[type=submit].pill{justify-self:start}
.success-card{margin-top:16px;padding:24px;border:1px solid rgba(76,183,130,.35);border-radius:12px;background:rgba(76,183,130,.05)}
.success-card h3{margin:0;font-size:18px}
.success-card p{margin:10px 0 0;font-size:14px;line-height:1.75;color:var(--t3)}
.success-card p strong{color:var(--t1)}
.follow-wechat{margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.note-code,.invite-code{font-family:var(--mono);letter-spacing:.06em;color:#fff}
.invite-code{margin-top:10px;display:inline-block;font-size:22px;padding:10px 16px;border-radius:10px;border:1px dashed var(--line-3);background:var(--bg)}
.support-qr{margin-top:14px;font-size:13px;color:var(--t4)}
.support-qr img{width:150px;height:150px;border-radius:10px;background:#fff;padding:6px}
.stage-list{list-style:none;margin:14px 0 0;padding:0;border-top:1px solid var(--line)}
.stage-list li{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px solid var(--line);font-size:14px;color:var(--t3)}
.stage-list strong{color:var(--t1);font-weight:500;text-align:right}
.result-area{margin-top:14px}
.process{list-style:none;counter-reset:p;margin:18px 0 0;padding:0}
.process li{counter-increment:p;position:relative;padding:0 0 20px 40px;font-size:14px;line-height:1.75;color:var(--t3)}
.process li::before{content:counter(p,decimal-leading-zero);position:absolute;left:0;top:1px;font-family:var(--mono);font-size:11.5px;color:var(--accent-2)}
.process strong{display:block;color:var(--t1);font-weight:600;font-size:15px;margin-bottom:2px}

/* 下载页 */
.release-info{margin-top:20px;border-top:1px solid var(--line)}
.release-row{display:grid;grid-template-columns:120px minmax(0,1fr);gap:16px;padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}
.release-row span{color:var(--t4)}
.release-row strong{color:var(--t1);font-weight:500}
.release-row ul{margin:0;padding-left:18px;color:var(--t3)}
.requirements{margin-top:56px}
.page-layout>div>h2,.requirements h2{font-size:24px}
.requirements ul{list-style:none;margin:20px 0 0;padding:0;border-top:1px solid var(--line)}
.requirements li{display:grid;grid-template-columns:120px minmax(0,1fr);gap:16px;padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}
.requirements li strong{color:var(--t2);font-weight:500}
.requirements li span{color:var(--t3)}

/* ---------- 帮助中心 / 问答 ---------- */
.help-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:56px;align-items:start}
.help-index{position:sticky;top:calc(var(--nav-h) + 24px);display:grid;gap:2px}
.help-index a{font-size:13.5px;color:var(--t3);padding:7px 12px;border-radius:7px;border-left:1px solid var(--line)}
.help-index a:hover{color:var(--t1);background:rgba(255,255,255,.03)}
.faq-section{padding-top:48px}
.faq-section:first-of-type{padding-top:28px}
.faq-section>h2{margin:0 0 12px;font-size:20px;font-weight:600;letter-spacing:-.01em}
details.faq{border-bottom:1px solid var(--line)}
.faq-section details.faq:first-of-type,.faq-list details.faq:first-of-type{border-top:1px solid var(--line)}
details.faq summary{
  list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;
  padding:18px 0;font-size:15.5px;font-weight:500;color:var(--t1);
}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";flex:none;font-family:var(--mono);font-size:16px;color:var(--t3);transition:transform .25s var(--ease)}
details.faq[open] summary::after{transform:rotate(45deg)}
details.faq summary:hover{color:#fff}
.faq-answer{padding:0 40px 20px 0;font-size:14.5px;line-height:1.85;color:var(--t3);max-width:780px}
.faq-permalink{display:inline-block;margin-left:10px;font-size:12px;color:var(--t4)!important;text-decoration:none!important}
.faq-permalink:hover{color:var(--t2)!important}
.contact-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.contact-card{padding:22px;border:1px solid var(--line);border-radius:12px;background:var(--bg-1)}
.contact-card h3{margin:0;font-size:16px}
.contact-card p{margin:8px 0 0;font-size:14px;line-height:1.75;color:var(--t3)}
.contact-card strong{color:var(--t1);font-weight:500}
.qa-lead{padding-bottom:0}
.qa-answer{font-size:15.5px;line-height:1.9;color:var(--t2);max-width:760px;padding-top:4px}
.qa-answer a{color:var(--t1);text-decoration:underline;text-underline-offset:3px}
.qa-related{margin-top:40px;padding-top:24px;border-top:1px solid var(--line);display:grid;gap:4px}
.qa-related h2{margin:0 0 8px!important;font-size:16px!important}
.qa-related a{font-size:14px;color:var(--t3);padding:5px 0}
.qa-related a:hover{color:var(--t1)}
.qa-more{margin-top:28px}

/* ---------- 首页：Hero ---------- */
.hero{position:relative;padding:104px 0 0;overflow:hidden}
.hero::before{content:"";position:absolute;left:50%;top:-260px;width:1200px;height:700px;transform:translateX(-50%);pointer-events:none;background:radial-gradient(closest-side,rgba(139,92,246,.16),transparent)}
.eyebrow{position:relative;display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--t2);padding:5px 12px 5px 6px;border-radius:999px;border:1px solid var(--line-2);background:rgba(255,255,255,.03);transition:border-color .15s}
.eyebrow:hover{border-color:var(--line-3)}
.eyebrow b{font-weight:600;font-size:11.5px;color:#fff;background:var(--accent);padding:2px 8px;border-radius:999px}
.eyebrow .arr{color:var(--t3)}
.hero h1{
  position:relative;margin:28px 0 0;max-width:1000px;
  font-size:clamp(32px,5vw,64px);line-height:1.14;font-weight:650;letter-spacing:-.035em;
  background:linear-gradient(180deg,#fff 20%,rgba(255,255,255,.62));-webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero h1 .nw{display:inline-block}
.hero .lead{position:relative;margin:26px 0 0;max-width:640px;font-size:clamp(16px,1.6vw,18px);line-height:1.7;color:var(--t3)}
.hero .lead b{color:var(--t2);font-weight:500}
.hero-cta{margin-top:36px}
.hero-meta{position:relative;margin-top:18px;display:flex;flex-wrap:wrap;gap:6px 18px;font-size:12.5px;color:var(--t4)}
.hero-ref{position:relative;margin-top:14px;font-size:13.5px;line-height:1.6;color:var(--t2)}
.hero-meta span::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--t4);margin:0 8px 2px 0;vertical-align:middle}
.hero-meta span:first-child::before{display:none}
.shot{position:relative;margin-top:72px}
.shot-frame{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line-2);background:var(--bg-1);box-shadow:0 0 0 1px rgba(0,0,0,.6),0 40px 120px -20px rgba(0,0,0,.9),0 0 80px -20px rgba(139,92,246,.25)}
.shot-frame::after{content:"";position:absolute;inset:auto 0 0 0;height:28%;background:linear-gradient(180deg,transparent,var(--bg));pointer-events:none}
.shot-frame img{width:100%;height:auto}
.shot-legend{position:relative;margin-top:-28px;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.shot-legend div{padding:18px 20px 0 0;font-size:13px;color:var(--t3);line-height:1.6}
.shot-legend div+div{padding-left:20px;border-left:1px solid var(--line)}
.shot-legend b{display:block;color:var(--t1);font-weight:600;font-size:13.5px;margin-bottom:2px}
.shot-legend .n{font-family:var(--mono);font-size:11px;color:var(--t4);margin-right:8px}

/* 三步导引 */
.flow3{list-style:none;margin:64px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.flow3 li{position:relative}
.flow3 a{display:block;height:100%;padding:18px 20px;border:1px solid var(--line);border-radius:12px;background:var(--bg-1);transition:border-color .2s,background .2s}
.flow3 a:hover{border-color:var(--line-3);background:rgba(255,255,255,.02)}
.flow3 li+li::before{content:"→";position:absolute;left:-11px;top:50%;transform:translate(-50%,-50%);color:var(--t4);font-size:13px}
.flow3 .n{font-family:var(--mono);font-size:11px;color:var(--accent-2)}
.flow3 b{display:block;margin-top:6px;font-size:15.5px;font-weight:600;color:var(--t1)}
.flow3 span:last-child{display:block;margin-top:4px;font-size:13px;line-height:1.6;color:var(--t3)}

/* 数字条 */
.stats{margin-top:96px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stats-in{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:30px 24px 28px 0}
.stat+.stat{padding-left:24px;border-left:1px solid var(--line)}
.stat .v{font-size:clamp(28px,3.2vw,38px);font-weight:600;letter-spacing:-.03em;line-height:1.1;font-variant-numeric:tabular-nums}
.stat .v small{font-size:.5em;font-weight:500;color:var(--t3);letter-spacing:0;margin-left:4px}
.stat .k{margin-top:8px;font-size:13px;color:var(--t3);line-height:1.55}

/* ---------- 首页：线性章节 ---------- */
.chapters{position:relative}
.chapter{position:relative;padding:128px 0 0}
.ch-head{position:relative;padding-left:var(--rail)}
.ch-node{position:absolute;left:0;top:2px;display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;color:var(--t4);letter-spacing:.04em}
.ch-node i{width:9px;height:9px;border-radius:50%;border:1px solid var(--line-3);background:var(--bg);transition:all .3s}
.chapter.on .ch-node{color:var(--accent-2)}
.chapter.on .ch-node i{background:var(--accent);border-color:var(--accent);box-shadow:0 0 0 4px rgba(139,92,246,.15)}
.ch-label{font-size:13px;color:var(--t3);display:flex;align-items:center;gap:8px}
.ch-head h2{
  margin:14px 0 0;max-width:820px;font-size:clamp(30px,4.4vw,52px);line-height:1.12;font-weight:650;letter-spacing:-.03em;
  background:linear-gradient(180deg,#fff 30%,rgba(255,255,255,.66));-webkit-background-clip:text;background-clip:text;color:transparent;
}
.ch-head p{margin:20px 0 0;max-width:640px;font-size:16px;line-height:1.75;color:var(--t3)}
.ch-head p b{color:var(--t2);font-weight:500}
.ch-head p a{color:var(--t2);text-decoration:underline;text-underline-offset:3px;text-decoration-color:var(--line-3)}
.ch-body{padding-left:var(--rail);margin-top:48px}
@media (min-width:1101px){
  .chapters::before{content:"";position:absolute;left:calc(var(--gutter) + 4px);top:132px;bottom:0;width:1px;background:linear-gradient(180deg,var(--line-2),var(--line) 80%,transparent)}
}
.sub-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:40px;padding:22px 0 0;border-top:1px solid var(--line);margin-top:20px}
.sub-row h3{margin:0;font-size:17px;font-weight:600;letter-spacing:-.01em}
.sub-row h3 small{display:block;margin-top:4px;font-weight:400;color:var(--t4);font-size:13px}
.sub-row p{margin:0;font-size:14.5px;line-height:1.75;color:var(--t3)}

/* 分段控件 */
.tabs-intro{margin:0 0 18px}
.tabs-intro h3{margin:0;font-size:clamp(18px,2vw,22px);font-weight:600;letter-spacing:-.015em;line-height:1.45}
.tabs-intro p{margin:8px 0 0;font-size:14px;color:var(--t3)}
.seg{display:inline-flex;gap:2px;padding:3px;border-radius:10px;border:1px solid var(--line);background:var(--bg-1);flex-wrap:wrap}
.seg button{font-size:13.5px;color:var(--t3);padding:7px 14px;border-radius:7px;transition:color .15s,background .15s}
.seg button:hover{color:var(--t1)}
.seg button[aria-selected="true"],.seg button[aria-pressed="true"]{color:var(--t1);background:var(--panel-2);box-shadow:inset 0 0 0 1px var(--line-2)}
.media{margin-top:20px;border-radius:12px;overflow:hidden;border:1px solid var(--line-2);background:var(--bg-1)}
.demo{position:relative;aspect-ratio:16/9;background:#0B0B0E}
.demo video{width:100%;height:100%;object-fit:cover}
.demo .pp{position:absolute;right:12px;bottom:12px;width:32px;height:32px;border-radius:8px;border:1px solid var(--line-2);background:rgba(8,9,10,.7);color:#fff;font-size:11px;display:grid;place-items:center;opacity:0;transition:opacity .2s;backdrop-filter:blur(6px)}
.demo:hover .pp,.demo .pp:focus-visible,.demo.paused .pp{opacity:1}
.cap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:11px 16px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11.5px;color:var(--t4);letter-spacing:.02em}
.tab-panel{animation:fade .35s var(--ease) both}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* 对比滑块 */
.ba{position:relative;border-radius:12px;overflow:hidden;border:1px solid var(--line-2);background:var(--bg-1);aspect-ratio:3106/1636;touch-action:pan-y;user-select:none;-webkit-user-select:none}
.ba-layer{position:absolute;inset:0}
.ba-layer img{width:100%;height:100%;object-fit:cover;object-position:right center;pointer-events:none;-webkit-user-drag:none}
.ba-after{clip-path:inset(0 0 0 var(--pos,55%))}
.ba-tag{position:absolute;top:14px;font-family:var(--mono);font-size:11px;padding:4px 10px;border-radius:6px;background:rgba(8,9,10,.78);border:1px solid var(--line-2);color:var(--t3);backdrop-filter:blur(6px)}
.ba-tag.l{left:14px}.ba-tag.r{right:14px;color:var(--t1)}
.ba-handle{position:absolute;top:0;bottom:0;left:var(--pos,55%);width:1px;background:rgba(255,255,255,.85);z-index:3;pointer-events:none}
.ba-knob{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:34px;height:34px;border-radius:50%;background:var(--t1);color:#08090A;display:grid;place-items:center;font-size:13px;font-weight:700;box-shadow:0 6px 20px rgba(0,0,0,.5)}
.ba input[type=range]{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:ew-resize;z-index:4;margin:0}
.ba-cap{padding:10px 0 0;font-family:var(--mono);font-size:11.5px;color:var(--t4)}

/* 判断卡（界面示意） */
.judge-wrap{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:48px;align-items:center}
.judge{border-radius:14px;border:1px solid var(--line-2);background:linear-gradient(180deg,var(--panel-2),var(--panel));box-shadow:0 30px 80px -30px rgba(0,0,0,.9);overflow:hidden;transition:border-color .4s}
.judge.dead{border-color:rgba(235,87,87,.45)}
.jg-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:11.5px;color:var(--t4)}
.jg-state{display:inline-flex;align-items:center;gap:7px;color:var(--ok)}
.jg-state i{width:7px;height:7px;border-radius:50%;background:currentColor;box-shadow:0 0 8px currentColor}
.judge.dead .jg-state{color:var(--bad)}
.jg-body{padding:20px 18px 6px}
.jg-body .k{font-size:11.5px;color:var(--t4);letter-spacing:.06em}
.jg-body .claim{margin:8px 0 0;font-size:16px;line-height:1.65;color:var(--t1);transition:opacity .4s}
.judge.dead .claim{opacity:.45;text-decoration:line-through;text-decoration-color:rgba(235,87,87,.6)}
.jg-conds{list-style:none;margin:10px 0 0;padding:0;border-top:1px solid var(--line)}
.jg-conds li{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13.5px;color:var(--t2)}
.jg-conds li:last-child{border-bottom:none}
.jg-conds .st{flex:none;font-family:var(--mono);font-size:11px;padding:2px 8px;border-radius:5px;color:var(--t3);border:1px solid var(--line-2)}
.jg-conds li.hit{color:#fff}
.jg-conds li.hit .st{color:#fff;background:var(--bad);border-color:var(--bad)}
.jg-foot{padding:12px 18px;border-top:1px solid var(--line);font-size:12.5px;color:var(--t4);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;min-height:44px}
.judge.dead .jg-foot .msg{color:#F4A3A3}
.judge-note{margin-top:10px;font-family:var(--mono);font-size:11px;color:var(--t4)}
.judge-points{list-style:none;margin:0;padding:0}
.judge-points li{position:relative;padding:0 0 22px 34px}
.judge-points li::before{content:attr(data-n);position:absolute;left:0;top:1px;font-family:var(--mono);font-size:11.5px;color:var(--t4)}
.judge-points h4{margin:0;font-size:15.5px;font-weight:600}
.judge-points p{margin:6px 0 0;font-size:14px;line-height:1.75;color:var(--t3)}

/* 盲测 */
.blind{margin-top:72px;border:1px solid var(--line);border-radius:14px;background:var(--bg-1);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.25fr)}
.blind-l{padding:30px 30px 28px;border-right:1px solid var(--line)}
.blind-l .k{font-size:12px;color:var(--t4);letter-spacing:.06em}
.blind-l .big{margin-top:10px;font-size:clamp(40px,5vw,56px);font-weight:650;letter-spacing:-.04em;line-height:1}
.blind-l .big em{font-style:normal;color:var(--accent-2)}
.blind-l p{margin:14px 0 0;font-size:14px;line-height:1.75;color:var(--t3)}
.blind-l p b{color:var(--t2);font-weight:500}
.blind-r{padding:22px 30px 24px}
.bt{width:100%;border-collapse:collapse;font-size:13.5px}
.bt th,.bt td{text-align:left;padding:10px 0;border-bottom:1px solid var(--line);font-weight:400}
.bt th{color:var(--t4);font-size:12px}
.bt td{color:var(--t2);font-variant-numeric:tabular-nums}
.bt td.v{color:#fff;font-weight:600}
.bt td:not(:first-child),.bt th:not(:first-child){text-align:right}
.blind-r dl{margin:16px 0 0;display:grid;grid-template-columns:auto 1fr;gap:6px 14px;font-size:12.5px;line-height:1.6}
.blind-r dt{color:var(--t4)}
.blind-r dd{margin:0;color:var(--t3)}

/* 规则流水线 */
.steps{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--bg-1)}
.step{position:relative;text-align:left;padding:18px 20px;border-left:1px solid var(--line);transition:background .2s}
.step:first-child{border-left:none}
.step .n{font-family:var(--mono);font-size:11px;color:var(--t4)}
.step b{display:block;margin-top:8px;font-size:15px;font-weight:600;color:var(--t2)}
.step span{display:block;margin-top:4px;font-size:12.5px;color:var(--t4);line-height:1.55}
.step::after{content:"";position:absolute;left:0;right:0;top:0;height:2px;background:transparent;transition:background .2s}
button.step:hover{background:rgba(255,255,255,.025)}
.step[aria-selected="true"]{background:rgba(255,255,255,.035)}
.step[aria-selected="true"] b{color:#fff}
.step[aria-selected="true"]::after{background:var(--accent)}
.step.you{background:repeating-linear-gradient(135deg,transparent 0 10px,rgba(255,255,255,.015) 10px 20px)}
.step.you b{color:var(--t1)}
.step.you .n{color:var(--warn)}
a.step.you:hover{background:rgba(255,255,255,.035)}
.auto-points{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:36px;padding-top:28px;border-top:1px solid var(--line)}
.auto-points li{padding-bottom:0}

/* ---------- 价格卡（首页与会员页共用） ---------- */
.bill{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.bill .note{font-size:13px;color:var(--t3)}
.bill .note b{color:var(--t1);font-weight:600}
.plans{margin-top:22px;display:grid;grid-template-columns:repeat(2,1fr);border:1px solid var(--line-2);border-radius:14px;overflow:hidden}
.plans.three{grid-template-columns:repeat(3,1fr)}
.plan{position:relative;padding:30px 30px 28px;display:flex;flex-direction:column;background:var(--bg-1)}
.plan+.plan{border-left:1px solid var(--line-2)}
.plan.ultra{background:linear-gradient(180deg,rgba(139,92,246,.07),var(--bg-1) 40%)}
.plan.ultra::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent-2),transparent)}
.plan-h{display:flex;align-items:center;justify-content:space-between;gap:12px}
.plan h3{margin:0;font-size:16px;font-weight:600}
.plan .rec{font-size:11.5px;color:var(--accent-2);border:1px solid rgba(139,92,246,.4);background:var(--accent-soft);padding:2px 8px;border-radius:999px}
.plan .who{margin:8px 0 0;font-size:13.5px;color:var(--t3);line-height:1.6;min-height:3.2em}
.price{margin-top:24px;display:flex;align-items:baseline;gap:8px}
.price .amt{font-size:44px;font-weight:650;letter-spacing:-.04em;font-variant-numeric:tabular-nums}
.price .per{font-size:14px;color:var(--t3)}
.price-sub{margin-top:4px;font-size:12.5px;color:var(--t4)}
.plan ul{list-style:none;margin:24px 0 0;padding:20px 0 0;border-top:1px solid var(--line);flex:1}
.plan li{position:relative;padding-left:24px;margin-bottom:11px;font-size:14px;line-height:1.65;color:var(--t3)}
.plan li::before{content:"";position:absolute;left:2px;top:.55em;width:9px;height:5px;border-left:1.6px solid var(--t2);border-bottom:1.6px solid var(--t2);transform:rotate(-45deg)}
.plan.ultra li::before{border-color:var(--accent-2)}
.plan li b{color:var(--t1);font-weight:600}
.plan .btn,.plan .pill{margin-top:22px;width:100%}
.cmp{margin-top:40px}
.cmp-h{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}
.cmp-h h3{margin:0;font-size:17px;font-weight:600}
.cmp-h span{font-size:13px;color:var(--t4)}
.ct{width:100%;margin-top:14px;border-collapse:collapse;font-size:14px}
.ct th,.ct td{text-align:left;padding:12px 16px 12px 0;border-top:1px solid var(--line);vertical-align:top;font-weight:400;line-height:1.6}
.ct thead th{border-top:none;color:var(--t4);font-size:12.5px;padding-top:0}
.ct tbody th{color:var(--t2);width:28%}
.ct td{color:var(--t3)}
.ct td.max{color:var(--t1)}
.cmp-note{margin:14px 0 0;font-size:13px;color:var(--t4);line-height:1.8;max-width:820px}

/* 评价 */
.rules{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.rules>div{padding:20px 24px 20px 0;font-size:13.5px;line-height:1.7;color:var(--t3)}
.rules>div+div{padding-left:24px;border-left:1px solid var(--line)}
.rules b{display:block;color:var(--t1);font-weight:600;font-size:14px;margin-bottom:4px}
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}
.reviews:empty{display:none}
.review{border:1px solid var(--line);border-radius:12px;background:var(--bg-1);padding:22px;display:flex;flex-direction:column}
.review blockquote{margin:0;flex:1;font-size:14.5px;line-height:1.8;color:var(--t1)}
.review .who{margin-top:18px;display:flex;align-items:center;gap:10px}
.review .av{width:30px;height:30px;border-radius:50%;flex:none;display:grid;place-items:center;font-size:12px;font-weight:700;background:var(--panel-2);border:1px solid var(--line-2)}
.review .who b{display:block;font-size:13.5px;font-weight:600}
.review .who span{display:block;font-size:12px;color:var(--t4)}
.review .meta{margin-top:12px;display:flex;flex-wrap:wrap;gap:4px 12px;font-family:var(--mono);font-size:11px;color:var(--t4)}
.review .meta .ok{color:var(--ok)}
.review .meta a{color:var(--t2);text-decoration:underline;text-underline-offset:3px}
.submit{margin-top:20px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:14px;color:var(--t3)}
.submit b{color:var(--t1);font-weight:600}

/* 结尾 */
.final{position:relative;margin-top:160px;padding:120px 0;border-top:1px solid var(--line);overflow:hidden}
.final::before{content:"";position:absolute;left:50%;bottom:-320px;width:1100px;height:640px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(139,92,246,.18),transparent);pointer-events:none}
.final h2{margin:0;max-width:780px;font-size:clamp(32px,5vw,60px);line-height:1.1}
.final p{position:relative;margin:22px 0 0;max-width:560px;font-size:16px;line-height:1.75;color:var(--t3)}

/* ---------- 页脚 ---------- */
.site-foot{border-top:1px solid var(--line);background:var(--bg);margin-top:120px}
.final+.site-foot,.closing+.site-foot,main>.closing:last-child~.site-foot{margin-top:0}
.foot{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:32px;padding:56px 0 40px}
.foot p{margin:14px 0 0;font-size:13px;color:var(--t4);line-height:1.75;max-width:300px}
.foot h4{margin:0 0 14px;font-size:12.5px;font-weight:600;color:var(--t2)}
.foot a.l,.foot .l{display:block;font-size:13px;color:var(--t4);padding:4px 0;transition:color .15s}
.foot a.l:hover{color:var(--t1)}
.foot .l b{font-weight:500;color:var(--t3)}
.risk{border-top:1px solid var(--line);padding:24px 0 8px;font-size:12px;color:var(--t4);line-height:1.9}
.copy{padding:12px 0 36px;font-size:12px;color:var(--t4);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,20px);opacity:0;z-index:90;pointer-events:none;background:var(--t1);color:#08090A;font-size:13.5px;font-weight:600;padding:10px 16px;border-radius:10px;box-shadow:0 12px 40px rgba(0,0,0,.6);transition:all .25s var(--ease);max-width:calc(100% - 32px);text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* 进场动画：只在脚本加上 .js 时隐藏，脚本没跑也能看到全部内容 */
.js .rv{opacity:0;transform:translateY(14px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.js .rv.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  :root{--rail:0px}
  .ch-node{position:static;margin-bottom:14px}
  .judge-wrap{grid-template-columns:1fr;gap:36px}
  .nav-center a{padding:6px 7px;font-size:13px}
  .page-layout,.membership-row{grid-template-columns:1fr;gap:40px}
  .plans.three{grid-template-columns:1fr}
  .plans.three .plan+.plan{border-left:none;border-top:1px solid var(--line-2)}
}
@media (max-width:960px){
  :root{--gutter:22px}
  .menu-button{display:block}
  .nav-row{justify-content:space-between}
  .nav-center{display:none;position:fixed;inset:var(--nav-h) 0 auto 0;z-index:69;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:6px var(--gutter) 18px;max-height:calc(100vh - var(--nav-h));overflow-y:auto}
  .nav-center.open{display:flex}
  .nav-center a{padding:13px 0;font-size:16px;color:var(--t2);border-bottom:1px solid var(--line);border-radius:0}
  .nav-center a:last-child{border-bottom:none}
  .hero{padding-top:72px}
  .page-lead{padding-top:64px}
  .shot{margin-top:52px}
  .shot-legend{grid-template-columns:1fr;margin-top:-12px}
  .shot-legend div,.shot-legend div+div{padding:12px 0;border-left:none;border-bottom:1px solid var(--line)}
  .stats-in{grid-template-columns:1fr 1fr}
  .flow3{grid-template-columns:1fr;gap:10px;margin-top:40px}
  .flow3 li+li::before{content:"↓";left:50%;top:-5px}
  .stat:nth-child(3){padding-left:0;border-left:none}
  .stat:nth-child(n+3){border-top:1px solid var(--line)}
  .chapter{padding-top:96px}
  .sub-row{grid-template-columns:1fr;gap:10px}
  .rules{grid-template-columns:1fr}
  .rules>div,.rules>div+div{padding-left:0;border-left:none;border-bottom:1px solid var(--line);padding-bottom:20px}
  .rules>div:last-child{border-bottom:none}
  .blind{grid-template-columns:1fr}
  .blind-l{border-right:none;border-bottom:1px solid var(--line)}
  .steps{grid-template-columns:1fr 1fr}
  .steps .step:nth-child(3){grid-column:1 / -1;border-left:none;border-top:1px solid var(--line)}
  .auto-points{grid-template-columns:1fr;gap:18px}
  .plans{grid-template-columns:1fr}
  .plan+.plan{border-left:none;border-top:1px solid var(--line-2)}
  .reviews{grid-template-columns:1fr}
  .ct tbody th{width:34%}
  .foot{grid-template-columns:1fr 1fr}
  .foot>div:first-child{grid-column:1/-1}
  .final{margin-top:120px;padding:90px 0}
  .ba{aspect-ratio:4/3.3}
  .flow.three,.flow.four{grid-template-columns:1fr 1fr}
  .help-layout{grid-template-columns:1fr;gap:20px}
  .help-index{position:static;display:flex;flex-wrap:wrap;gap:6px}
  .help-index a{border:1px solid var(--line);border-radius:999px;padding:5px 12px;font-size:13px}
  .contact-cards{grid-template-columns:1fr}
  .closing{margin-top:96px;padding:80px 0}
}
@media (max-width:560px){
  .hero-cta .btn{flex:1}
  .seg{display:flex}
  .seg button{flex:1;padding:7px 8px}
  .ct{font-size:13px}
  .ct th,.ct td{padding-right:10px}
  .field-grid{grid-template-columns:1fr}
  .flow.three,.flow.four{grid-template-columns:1fr}
  .form-box,.status-box{padding:22px 18px}
  .points-table{font-size:13px}
  .points-table td:first-child,.points-table td:nth-child(2){white-space:normal}
  .release-row,.requirements li{grid-template-columns:1fr;gap:4px}
  .code-row{flex-wrap:wrap}
  .code-row .pill{width:100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .rv{opacity:1;transform:none;transition:none}
  .tab-panel{animation:none}
}