/* 老克 · 官网样式
   规范来源：设计画布 Spec.dc.html（颜色 / 字体 / 字号 / 间距） */

:root{
  /* 颜色 */
  --ink:#0A0C10;          /* 深色区块底色、浅底主文字 */
  --ink-2:#0F1218;        /* 浅底主文字、深色按钮 */
  --surface:#11141A;      /* 深色区卡片 */
  --demo:#12151C;         /* 演示窗口 */
  --signal:#8AB4FF;       /* 强调蓝（深底） */
  --signal-deep:#2456D6;  /* 强调蓝·深（浅底文字） */
  --mint:#6FD9BC;         /* 校验绿（深底） */
  --mint-deep:#0E7A5E;
  --fg:#ECEEF2;           /* 深底主文字 */
  --muted:#A0A8B6;        /* 深底辅文 */
  --muted-2:#8B93A2;
  --dim:#7D8696;
  --paper:#F2F3F6;        /* 浅色区块底色 */
  --white:#FFFFFF;
  --text-2:#2B313C;
  --muted-light:#545C6B;  /* 浅底辅文 */
  --line-light:#E1E4EA;
  --line-dark:rgba(255,255,255,.08);
  --error:#B3261E;
  --foot:#07080B;

  /* 字体 */
  --f-serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --f-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;

  /* 布局 */
  --maxw:1200px;
  --gutter:clamp(20px,3vw,40px);
  --sec-pad:clamp(72px,8.9vw,128px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:var(--ink);color:var(--fg);font-family:var(--f-sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
[hidden]{display:none!important}
a{color:inherit}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:6px}
h1,h2,h3{margin:0}
p{margin:0}

.skip{position:absolute;left:-9999px;top:8px;z-index:100;background:var(--signal);color:var(--ink);padding:8px 14px;border-radius:8px;text-decoration:none}
.skip:focus{left:8px}

.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.dots{background-color:var(--ink);background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);background-size:26px 26px}

/* ---------- 文字层级 ---------- */
.display{font-family:var(--f-serif);font-weight:900;font-size:clamp(40px,5.8vw,84px);line-height:1.1;letter-spacing:-.01em;text-wrap:balance}
.accent{color:var(--signal)}
.h2{font-family:var(--f-serif);font-weight:700;font-size:clamp(30px,3.6vw,52px);line-height:1.2;text-wrap:balance}
.lead{font-size:clamp(16px,1.32vw,19px);line-height:1.8;color:var(--muted);text-wrap:pretty}
.lead--light{color:var(--muted-light)}
.kicker{font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;color:var(--signal)}
.kicker--light{color:var(--signal-deep)}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:999px;font-family:inherit;font-weight:500;text-decoration:none;cursor:pointer;border:0;transition:transform .15s ease,background .15s ease,border-color .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--signal);color:var(--ink)}
.btn--primary:hover{background:#A3C4FF}
.btn--ghost{border:1px solid rgba(255,255,255,.22);color:var(--fg);background:transparent}
.btn--ghost:hover{border-color:rgba(255,255,255,.45)}
.btn--lg{min-height:52px;padding:0 28px;font-size:16px}
.btn--nav{min-height:44px;padding:0 20px;font-size:15px;gap:8px}
.btn--ink{min-height:52px;padding:0 32px;background:var(--ink-2);color:#fff;font-size:16px}
.btn--ink:disabled{opacity:.6;cursor:progress;transform:none}
.btn--outline{min-height:48px;padding:0 22px;border:1px solid #C9CED8;background:#fff;color:var(--ink-2);font-size:15px;font-weight:400}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:20;background:rgba(10,12,16,.86);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--line-dark)}
.nav__in{height:68px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--fg)}
.brand__mark{width:26px;height:32px;border:1.5px solid var(--fg);border-radius:4px 9px 4px 4px;display:flex;align-items:center;justify-content:center;flex:none}
.brand__mark span{width:13px;height:3px;border-radius:2px;background:var(--signal)}
.brand__mark--sm{width:22px;height:27px;border-radius:3px 8px 3px 3px}
.brand__mark--sm span{width:11px}
.brand__cn{font-family:var(--f-serif);font-weight:900;font-size:21px;letter-spacing:.04em}
.brand__en{font-family:var(--f-mono);font-weight:500;font-size:13px;letter-spacing:.04em;color:var(--muted)}

/* ---------- Hero ---------- */
.hero__grid{padding-top:clamp(48px,6vw,96px);padding-bottom:clamp(56px,6vw,88px);display:grid;grid-template-columns:repeat(auto-fit,minmax(min(500px,100%),1fr));gap:clamp(40px,4.5vw,72px);align-items:center}
.hero__copy{display:flex;flex-direction:column;align-items:flex-start;gap:28px}
.hero__copy .lead{max-width:540px}
.hero__demo{min-width:0}
.pill{display:inline-flex;align-items:center;gap:10px;padding:7px 14px;border:1px solid rgba(138,180,255,.35);border-radius:999px;background:rgba(138,180,255,.07);font-size:13px;letter-spacing:.06em;color:#C9D8F5}
.pill__dot{width:7px;height:7px;border-radius:50%;background:var(--mint);box-shadow:0 0 0 4px rgba(111,217,188,.18);flex:none}
.ctas{display:flex;flex-wrap:wrap;gap:12px;padding-top:4px}
.meta-row{display:flex;flex-wrap:wrap;gap:8px 20px;font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;color:var(--dim)}
.ticker{border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark)}
.ticker__in{padding-top:22px;padding-bottom:22px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 28px;font-family:var(--f-serif);font-weight:600;font-size:clamp(16px,1.5vw,21px);color:#6E7787}
.ticker__label{font-family:var(--f-mono);font-weight:500;font-size:12px;letter-spacing:.1em;color:var(--signal)}

/* ---------- 演示窗口 ---------- */
.demo{background:var(--demo);border:1px solid rgba(255,255,255,.12);border-radius:16px;overflow:hidden;box-shadow:0 40px 80px -30px rgba(0,0,0,.7),0 0 0 1px rgba(0,0,0,.4)}
.demo__bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line-dark);background:#0E1117}
.demo__tabs{display:flex;gap:4px;padding:3px;background:rgba(255,255,255,.05);border-radius:10px}
.demo__tab{display:flex;align-items:center;gap:7px;min-height:36px;padding:0 14px;border:0;border-radius:8px;cursor:pointer;font-family:inherit;font-size:14px;background:transparent;color:#A0A8B6;transition:background .2s ease,color .2s ease}
.demo__tab span{font-family:var(--f-mono);font-size:11px;opacity:.7}
.demo__tab[aria-selected="true"]{background:var(--fg);color:var(--ink)}
.demo__badge{font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;color:var(--muted-2);padding:4px 8px;border:1px solid rgba(255,255,255,.14);border-radius:6px}
.demo__progress{height:2px;background:rgba(255,255,255,.05)}
.demo__progress div{height:2px;width:0;background:var(--signal);transition:width .28s linear}
.demo__need{display:flex;gap:12px;align-items:flex-start;padding:18px 18px 14px}
.demo__needtag{flex:none;font-family:var(--f-mono);font-size:11px;letter-spacing:.08em;color:var(--ink);background:var(--signal);border-radius:6px;padding:4px 8px;margin-top:2px}
.demo__need p{font-size:15px;line-height:1.65;color:var(--fg)}
.demo__doc{margin:0 14px;height:372px;overflow:hidden;background:#FAFBFC;border-radius:10px;padding:22px 24px;color:var(--ink-2);display:flex;flex-direction:column;gap:9px}
.dl{opacity:0;transform:translateY(8px);transition:opacity .45s ease,transform .45s ease}
.dl.on{opacity:1;transform:none}
.dl--title{font-family:var(--f-serif);font-weight:900;font-size:18px;line-height:1.4}
.dl--meta{font-family:var(--f-mono);font-size:11px;letter-spacing:.04em;color:#5A6272;padding-bottom:8px;border-bottom:1px solid var(--line-light)}
.dl--h{font-weight:700;font-size:14px;line-height:1.5;padding-top:4px}
.dl--p{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 8px;font-size:13.5px;line-height:1.6;color:var(--text-2)}
.dl__src{font-family:var(--f-mono);font-size:10.5px;color:#1F4FC4;background:#E8EFFE;border-radius:4px;padding:1px 6px;white-space:nowrap}
.dl--en{font-family:var(--f-mono);font-size:11.5px;line-height:1.6;color:#5A6272}
.dl--check{display:flex;align-items:center;gap:8px;margin-top:4px;font-size:12.5px;font-weight:500;color:var(--mint-deep)}
.demo__stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;padding:14px}
.stat{display:flex;flex-direction:column;gap:4px;padding:12px 14px;background:rgba(255,255,255,.04);border:1px solid var(--line-dark);border-radius:10px;min-width:0}
.stat b{font-family:var(--f-mono);font-size:22px;font-weight:500;color:var(--fg);line-height:1.1;font-variant-numeric:tabular-nums}
.stat span{font-size:12px;color:var(--muted-2)}
.demo__note{padding:0 16px 14px;font-size:11.5px;line-height:1.5;color:var(--dim)}

/* ---------- 通用区块 ---------- */
.sec__in{padding-top:var(--sec-pad);padding-bottom:var(--sec-pad);display:flex;flex-direction:column;gap:clamp(40px,4vw,64px)}
.sec__head{display:flex;flex-direction:column;gap:18px;max-width:760px}
.sec__head--split{max-width:none;flex-direction:row;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px 40px}
.sec--dark{background:var(--ink);color:var(--fg)}
.sec--dark.dots{background-color:var(--ink);background-image:radial-gradient(rgba(255,255,255,.06) 1px,transparent 1px)}
.sec--paper{background:var(--paper);color:var(--ink-2)}
.sec--white{background:var(--white);color:var(--ink-2)}

/* ---------- 能力卡 ---------- */
.caps{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(500px,100%),1fr));gap:20px}
.cap{display:flex;flex-direction:column;gap:24px;padding:clamp(18px,2vw,28px);background:var(--surface);border:1px solid var(--line-dark);border-radius:16px;min-width:0}
.cap__text{display:flex;flex-direction:column;gap:10px}
.cap__title{display:flex;align-items:baseline;gap:14px}
.num{font-family:var(--f-mono);font-size:13px;color:var(--signal)}
.cap h3{font-family:var(--f-serif);font-weight:700;font-size:clamp(21px,1.8vw,26px);line-height:1.3}
.cap p{font-size:15.5px;line-height:1.8;color:var(--muted)}

.illus{min-height:220px;position:relative;overflow:hidden;padding:20px;background-color:#0C0F14;background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);background-size:20px 20px;border:1px solid var(--line-dark);border-radius:12px;color:var(--fg);display:flex;flex-direction:column;justify-content:center}
.mono{font-family:var(--f-mono)}

/* 示意 1：一摞资料 → 一份文档 */
.i1{display:flex;align-items:center;justify-content:space-evenly;gap:8px}
.i1__col{display:flex;flex-direction:column;align-items:center;gap:10px}
.i1__stack{position:relative;width:122px;height:150px;flex:none}
.i1__card{position:absolute;width:92px;height:120px;padding:10px;background:#1C212B;border:1px solid rgba(255,255,255,.16);border-radius:6px;display:flex;flex-direction:column;gap:6px;transition:transform .7s cubic-bezier(.6,0,.3,1),opacity .7s ease}
.i1__card small{font-family:var(--f-mono);font-size:9.5px;color:var(--muted-2)}
.i1__card i{display:block;height:3px;border-radius:2px;background:rgba(255,255,255,.12)}
.i1__card i:first-of-type{background:rgba(255,255,255,.22);width:80%}
.i1__card i:nth-of-type(3){width:92%}
.i1__card i:nth-of-type(4){width:60%}
.i1__cap{font-family:var(--f-mono);font-size:10.5px;color:var(--muted-2)}
.i1__arrow{flex:1 1 40px;max-width:110px;display:flex;flex-direction:column;align-items:center;gap:6px}
.i1__arrow i{width:100%;height:1px;background:linear-gradient(90deg,rgba(138,180,255,0),var(--signal))}
.i1__arrow span{font-family:var(--f-mono);font-size:10px;color:var(--signal);white-space:nowrap}
.i1__doc{width:112px;height:150px;padding:14px 12px;background:#F4F6FA;border-radius:6px;display:flex;flex-direction:column;gap:7px;box-shadow:0 12px 30px -10px rgba(138,180,255,.45)}
.i1__doc b{height:5px;width:64%;background:var(--ink-2);border-radius:2px}
.i1__doc i{height:3px;width:0;border-radius:2px;background:#B7BDC8;transition:width .6s ease}
.i1__doc i.hl{background:var(--signal)}

/* 示意 2：40 集人设线 */
.i2{display:flex;flex-direction:column;gap:14px}
.i2__legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:12px;color:#D5DAE3}
.i2__legend span{display:flex;align-items:center;gap:6px}
.i2__legend i{width:14px;height:2px;flex:none}
.i2__track{position:relative;height:76px}
.i2__bars{position:absolute;inset:0;display:flex;gap:3px}
.i2__bars i{flex:1 1 0;min-width:0;border-radius:2px;background:rgba(255,255,255,.05);transition:background .3s ease}
.i2__bars i.on{background:rgba(138,180,255,.20)}
.i2__line{position:absolute;left:0;height:2px;width:0;transition:width .15s linear}
.i2__foot{display:flex;justify-content:space-between;gap:12px;font-family:var(--f-mono);font-size:11px;color:var(--muted-2)}
.i2__foot .ok{color:var(--mint)}

/* 示意 3：出处 */
.i3{display:flex;flex-wrap:wrap;gap:16px 22px;align-items:center}
.i3__p{flex:1 1 210px;font-size:14px;line-height:2.05;color:#D5DAE3}
.i3__p sup{display:inline-block;margin:0 2px;padding:0 5px;border-radius:4px;font-family:var(--f-mono);font-size:10px;line-height:16px;vertical-align:6px;background:rgba(138,180,255,.16);color:var(--signal);transition:background .3s ease,color .3s ease;cursor:default}
.i3__p sup.on{background:var(--signal);color:var(--ink)}
.i3__list{flex:1 1 180px;display:flex;flex-direction:column;gap:6px}
.i3__src{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;border:1px solid var(--line-dark);background:transparent;transition:background .3s ease,border-color .3s ease}
.i3__src.on{background:rgba(138,180,255,.12);border-color:var(--signal)}
.i3__src b{font-family:var(--f-mono);font-weight:400;font-size:10.5px;color:var(--signal)}
.i3__src span{font-size:12.5px;color:#D5DAE3}
.i3__src small{margin-left:auto;font-family:var(--f-mono);font-size:10.5px;color:var(--muted-2);white-space:nowrap}

/* 示意 4：目录树 */
.i4{display:flex;flex-direction:column;gap:3px}
.i4__row{display:flex;align-items:center;gap:8px;min-height:20px;opacity:0;transform:translateX(-8px);transition:opacity .4s ease,transform .4s ease}
.i4__row.on{opacity:1;transform:none}
.i4__row i{width:10px;height:1px;background:rgba(255,255,255,.3);flex:none}
.i4__no{font-family:var(--f-mono);font-size:11px;min-width:34px;color:var(--dim)}
.i4__t{font-size:12.5px;color:#B9C0CC;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.i4__row--top .i4__no{color:var(--signal)}
.i4__row--top .i4__t{font-size:13.5px;font-weight:700;color:var(--fg)}
.i4__ref{font-family:var(--f-mono);font-size:10px;padding:1px 6px;border-radius:4px;white-space:nowrap;background:rgba(138,180,255,.14);color:var(--signal);transition:background .3s ease,color .3s ease}
.i4__ref.on{background:var(--signal);color:var(--ink)}

/* ---------- 交付什么 ---------- */
.deliver{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(480px,100%),1fr));gap:20px}
.dcard{display:flex;flex-direction:column;gap:22px;padding:clamp(24px,3vw,44px);border-radius:20px}
.dcard--light{background:var(--white);border:1px solid var(--line-light)}
.dcard--light p{font-size:16px;line-height:1.8;color:var(--muted-light)}
.dcard--dark{background:var(--ink-2);color:var(--fg)}
.dcard--dark p{font-size:16px;line-height:1.8;color:var(--muted)}
.dcard__top{display:flex;align-items:center;justify-content:space-between;gap:16px}
.h3big{font-family:var(--f-serif);font-weight:900;font-size:clamp(26px,2.4vw,36px);line-height:1.25}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips span{padding:7px 14px;border-radius:999px;background:var(--paper);font-size:14px;color:var(--text-2)}
.chips--dark span{background:rgba(255,255,255,.07);color:#D5DAE3}
.dcard--dark .dcard__foot{padding-top:16px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;line-height:1.7;color:var(--muted-2)}
.docicons{display:flex;gap:6px;align-items:flex-end}
.docicon{width:34px;height:44px;border:1.5px solid var(--ink-2);border-radius:4px;padding:7px 6px;display:flex;flex-direction:column;gap:4px}
.docicon i{height:2px;background:#B7BDC8}
.docicon i.w70{width:70%;background:var(--ink-2)}
.docicon i.w60{width:60%}
.docicon--ink{background:var(--ink-2)}
.docicon--ink i{background:#5A6272}
.docicon--ink i.w70{background:var(--signal)}
.shoticons{display:flex;gap:4px}
.shoticons span{width:30px;height:20px;border:1.5px solid rgba(255,255,255,.35);border-radius:3px;font-family:var(--f-mono);font-size:8px;color:var(--muted);display:flex;align-items:center;justify-content:center}
.shoticons span.on{border-color:var(--signal);color:var(--signal)}

/* ---------- 服务领域 ---------- */
.domains{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(340px,100%),1fr));gap:1px;background:var(--line-light);border:1px solid var(--line-light);border-radius:16px;overflow:hidden}
.domain{background:var(--white);padding:clamp(24px,2.6vw,36px);display:flex;flex-direction:column;gap:12px}
.domain span{font-family:var(--f-mono);font-size:12px;color:var(--signal-deep)}
.domain h3{font-family:var(--f-serif);font-weight:700;font-size:22px}
.domain p{font-size:15px;line-height:1.75;color:var(--muted-light)}

/* ---------- 合作方式 ---------- */
.steps{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(240px,100%),1fr));border-top:1px solid rgba(255,255,255,.14)}
.steps li{display:flex;flex-direction:column;gap:14px;padding:28px 24px 28px 0;border-bottom:1px solid var(--line-dark)}
.steps__no{font-family:var(--f-mono);font-size:40px;color:var(--signal);line-height:1}
.steps h3{font-size:20px;font-weight:700}
.steps p{font-size:15px;line-height:1.75;color:var(--muted)}
.limit{display:flex;flex-wrap:wrap;align-items:center;gap:12px 28px;padding:24px 28px;border:1px solid rgba(138,180,255,.4);border-radius:14px;background:rgba(138,180,255,.06);font-size:16px;line-height:1.7;color:#D5DAE3}
.limit__t{font-family:var(--f-serif);font-weight:900;font-size:22px;color:var(--signal)}

/* ---------- 接单原则 ---------- */
.rules{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(480px,100%),1fr));gap:20px}
.rule{display:flex;flex-direction:column;gap:22px;padding:clamp(24px,3vw,40px);background:var(--white);border:1px solid var(--line-light);border-radius:20px}
.rule h3{display:flex;align-items:center;gap:12px;font-size:20px;font-weight:700}
.rule__ic{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex:none}
.rule__ic--ok{background:#E3F5EE;color:var(--mint-deep)}
.rule__ic--no{background:#FBE9E8;color:var(--error)}
.rule ul{margin:0;padding:0;list-style:none}
.rule li{padding:16px 0;border-top:1px solid #ECEEF2;font-size:16px;line-height:1.6}

/* ---------- 沟通需求 ---------- */
.contact{flex-direction:row;flex-wrap:wrap;gap:clamp(40px,5vw,80px);align-items:flex-start}
.contact__side{flex:1 1 360px;min-width:0;display:flex;flex-direction:column;gap:32px}
.contact__form{flex:1.4 1 520px;min-width:0}
.qrs{display:flex;flex-wrap:wrap;gap:16px}
.qr{margin:0;display:flex;flex-direction:column;gap:10px;padding:14px;background:var(--surface);border:1px solid var(--line-dark);border-radius:14px}
.qr__img{width:132px;height:132px;border-radius:8px;background:#fff;padding:6px;display:flex;align-items:center;justify-content:center}
.qr__img img{width:100%;height:100%;object-fit:contain}
.qr__ph{font-size:12px;line-height:1.5;color:#6A7282;text-align:center}
.qr figcaption{display:flex;flex-direction:column;gap:2px}
.qr figcaption span{font-size:14px;font-weight:500}
.qr figcaption small{font-size:12px;color:var(--muted-2)}
.ids{margin:0;display:grid;grid-template-columns:auto 1fr;gap:12px 20px;font-size:15px}
.ids dt{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;color:var(--dim);padding-top:2px}
.ids dd{margin:0;color:#D5DAE3;word-break:break-all}

.formcard{background:var(--white);color:var(--ink-2);border-radius:20px;padding:clamp(22px,3vw,40px);box-shadow:0 30px 60px -30px rgba(0,0,0,.5)}
#lead-form{display:flex;flex-direction:column;gap:22px}
.banner{display:flex;align-items:center;gap:10px;padding:12px 16px;border-radius:10px;background:#FDECEC;color:#8C1D18;font-size:14px;font-weight:500}
.field{display:flex;flex-direction:column;gap:8px}
.field label{font-size:14px;font-weight:500}
.req{color:var(--error)}
.field input[type=text],.field select,.field textarea{width:100%;min-height:48px;padding:0 14px;border-radius:10px;border:1px solid #C9CED8;background:#fff;font-family:inherit;font-size:15px;color:var(--ink-2);outline:none;transition:border-color .15s ease,box-shadow .15s ease}
.field select{padding:0 12px}
.field textarea{padding:12px 14px;line-height:1.7;resize:vertical;min-height:132px}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--signal-deep);box-shadow:0 0 0 3px rgba(36,86,214,.15)}
.field.err input[type=text],.field.err select,.field.err textarea{border:2px solid var(--error)}
.ferr{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--error)}
.ferr::before{content:"";width:13px;height:13px;flex:none;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='8' cy='8' r='6.5'/%3E%3Cpath d='M8 4.5v4M8 11v.5'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='black' stroke-width='2'%3E%3Ccircle cx='8' cy='8' r='6.5'/%3E%3Cpath d='M8 4.5v4M8 11v.5'/%3E%3C/svg%3E") center/contain no-repeat}
.ferr--indent{padding-left:28px}
.pills{margin:0;padding:0;border:0;display:flex;flex-direction:column;gap:10px;min-width:0}
.pills legend{padding:0;margin-bottom:10px;font-size:14px;font-weight:500}
.pills__row{display:flex;flex-wrap:wrap;gap:8px}
.pills button{min-height:44px;padding:0 18px;border-radius:999px;font-family:inherit;font-size:14px;cursor:pointer;border:1px solid #C9CED8;background:#fff;color:var(--text-2);transition:background .15s ease,color .15s ease,border-color .15s ease}
.pills button[aria-pressed="true"]{background:var(--ink-2);color:#fff;border-color:var(--ink-2)}
.agree{display:flex;align-items:flex-start;gap:10px;font-size:14px!important;font-weight:400!important;line-height:1.6;color:var(--text-2);cursor:pointer}
.agree input{width:18px;height:18px;margin:2px 0 0;accent-color:var(--ink-2);flex:none}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.submit{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;padding-top:6px;font-size:13px;color:#6A7282}
.success{display:flex;flex-direction:column;align-items:flex-start;gap:22px;padding:24px 0 8px}
.success__ic{width:56px;height:56px;border-radius:50%;background:#E3F5EE;color:var(--mint-deep);display:flex;align-items:center;justify-content:center}
.success h3{font-family:var(--f-serif);font-weight:900;font-size:30px;line-height:1.3}
.success p{font-size:16px;line-height:1.8;color:var(--text-2)}
.ticket{display:flex;flex-direction:column;gap:6px;padding:18px 22px;background:var(--paper);border-radius:12px;width:100%}
.ticket span{font-size:13px;color:var(--muted-light)}
.ticket strong{font-family:var(--f-mono);font-size:28px;font-weight:500;letter-spacing:.02em;color:var(--ink-2);word-break:break-all}
.ticket small{font-size:12px;color:#6A7282}

/* ---------- FAQ ---------- */
.faqwrap{flex-direction:row;flex-wrap:wrap;gap:32px clamp(40px,5vw,80px)}
.faqwrap__head{flex:1 1 280px}
.faq{flex:2 1 560px;min-width:0;border-top:1px solid var(--ink-2)}
.faq__item{border-bottom:1px solid var(--line-light)}
.faq__q{width:100%;min-height:72px;display:flex;align-items:center;gap:18px;padding:18px 0;border:0;background:transparent;text-align:left;cursor:pointer;font-family:inherit;color:var(--ink-2)}
.faq__no{font-family:var(--f-mono);font-size:12px;color:var(--signal-deep);flex:none;width:24px}
.faq__text{flex:1;font-size:clamp(16px,1.3vw,18px);font-weight:500;line-height:1.5}
.faq__ic{flex:none;width:32px;height:32px;border-radius:50%;border:1px solid #C9CED8;background:#fff;color:var(--ink-2);display:flex;align-items:center;justify-content:center;transition:background .2s ease,color .2s ease,border-color .2s ease}
.faq__ic .minus{display:none}
.faq__q[aria-expanded="true"] .faq__ic{background:var(--ink-2);color:#fff;border-color:var(--ink-2)}
.faq__q[aria-expanded="true"] .faq__ic .plus{display:none}
.faq__q[aria-expanded="true"] .faq__ic .minus{display:block}
.faq__a{padding:0 50px 24px 42px;font-size:15.5px;line-height:1.85;color:var(--muted-light)}

/* ---------- 页脚 ---------- */
.foot{background:var(--foot);border-top:1px solid var(--line-dark)}
.foot__in{padding-top:48px;padding-bottom:56px;display:flex;flex-direction:column;gap:24px}
.foot__row{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px 32px}
.foot__brand{display:flex;flex-wrap:wrap;align-items:center;gap:10px 12px}
.foot__brand .brand__cn{font-size:19px}
.foot__brand .brand__en{font-size:12px}
.foot__co{font-size:14px;color:var(--muted-2)}
.foot__domain{font-family:var(--f-mono);font-size:13px;color:var(--muted-2)}
.foot__legal{padding-top:24px;border-top:1px solid var(--line-dark);font-size:13px;line-height:1.8;color:var(--muted-2);max-width:820px}

/* ---------- H5 ---------- */
@media (max-width:600px){
  .demo__tab{padding:0 10px;font-size:13px}
  .demo__doc{height:340px;padding:18px 16px}
  .stat b{font-size:18px}
  .stat{padding:10px}
  .faq__a{padding:0 0 22px 42px}
  .steps li{padding-right:0}
  .i1__stack{transform:scale(.85);transform-origin:center}
  .i1__doc{transform:scale(.85)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
}

/* ---------- 页脚政策链接 ---------- */
.foot__links{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:14px}
.foot__links a{color:var(--muted);text-decoration:none}
.foot__links a:hover{color:var(--fg);text-decoration:underline}

/* ---------- 政策页（服务条款 / 退款政策 / 隐私政策） ---------- */
.legal{background:var(--white);color:var(--ink-2)}
.legal__in{padding-top:clamp(56px,7vw,96px);padding-bottom:clamp(72px,8vw,112px);max-width:820px}
.legal__back{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--signal-deep);text-decoration:none;margin-bottom:28px}
.legal__back:hover{text-decoration:underline}
.legal h1{font-family:var(--f-serif);font-weight:900;font-size:clamp(32px,4vw,48px);line-height:1.2;margin-bottom:12px}
.legal__meta{font-family:var(--f-mono);font-size:12px;letter-spacing:.06em;color:var(--muted-light);margin-bottom:40px}
.legal__summary{background:var(--paper);border-radius:14px;padding:20px 24px;margin-bottom:40px;font-size:15.5px;line-height:1.8}
.legal__summary ul{margin:8px 0 0;padding-left:20px}
.legal h2{font-family:var(--f-serif);font-weight:700;font-size:22px;line-height:1.35;margin:40px 0 12px}
.legal p,.legal li{font-size:15.5px;line-height:1.9;color:var(--text-2)}
.legal p+p{margin-top:12px}
.legal ul,.legal ol{margin:8px 0 0;padding-left:22px;display:flex;flex-direction:column;gap:6px}
.legal a{color:var(--signal-deep)}
.legal table{width:100%;border-collapse:collapse;margin-top:12px;font-size:14.5px}
.legal th,.legal td{text-align:left;vertical-align:top;padding:12px 14px;border:1px solid var(--line-light);line-height:1.7}
.legal th{background:var(--paper);font-weight:700}
.legal__table{overflow-x:auto}

.fhint{font-size:12.5px;line-height:1.6;color:#6A7282}