/* ===== 云问AI客服 · 样式表 ===== */
:root{
  --brand-1:#4F66F5;
  --brand-2:#8B5CF6;
  --accent:#06B6D4;
  --grad:linear-gradient(135deg,#4F66F5 0%,#8B5CF6 100%);
  --grad-soft:linear-gradient(135deg,#eef1ff 0%,#f6f1ff 100%);
  --ink:#0F172A;
  --ink-2:#334155;
  --muted:#64748B;
  --line:#E6E9F2;
  --bg:#FFFFFF;
  --bg-soft:#F7F8FC;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06),0 1px 3px rgba(15,23,42,.05);
  --shadow:0 8px 24px rgba(31,41,89,.08);
  --shadow-lg:0 20px 48px rgba(31,41,89,.14);
  --radius:16px;
  --radius-lg:22px;
  --maxw:1160px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
ul{list-style:none}
b{font-weight:700}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:6px;
  font-size:15px;font-weight:600;line-height:1;cursor:pointer;
  border:1px solid transparent;border-radius:12px;padding:13px 22px;
  transition:transform .15s ease,box-shadow .2s ease,background .2s ease,color .2s ease,border-color .2s ease;
  white-space:nowrap;user-select:none;
}
.btn--sm{padding:9px 16px;font-size:14px;border-radius:10px}
.btn--lg{padding:16px 30px;font-size:16px;border-radius:14px}
.btn--block{display:flex;width:100%}
.btn--primary{background:var(--grad);color:#fff;box-shadow:0 8px 20px rgba(79,102,245,.32)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(79,102,245,.42)}
.btn--ghost{background:#fff;color:var(--brand-1);border-color:#d8ddf5}
.btn--ghost:hover{background:#f4f6ff;border-color:var(--brand-1);transform:translateY(-2px)}

/* ===== 导航 ===== */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);backdrop-filter:saturate(180%) blur(14px);border-bottom:1px solid transparent;transition:border-color .2s,box-shadow .2s}
.nav.is-scrolled{border-bottom-color:var(--line);box-shadow:0 4px 20px rgba(15,23,42,.05)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:inline-flex;align-items:center;gap:10px}
.brand__mark{display:inline-flex;filter:drop-shadow(0 4px 10px rgba(79,102,245,.3))}
.brand__name{font-size:20px;font-weight:800;letter-spacing:.2px}
.brand__name b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand--light .brand__name{color:#fff}
.brand--light .brand__name b{color:#c7b8ff;background:none;-webkit-text-fill-color:#c7b8ff}

.nav__links{display:flex;align-items:center;gap:30px}
.nav__links>a{font-size:15px;font-weight:500;color:var(--ink-2);transition:color .2s}
.nav__links>a:hover{color:var(--brand-1)}
.nav__links .nav__cta{color:#fff}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav__toggle span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.nav__toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav__toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{position:relative;padding:64px 0 72px;background:
  radial-gradient(900px 460px at 88% -8%,rgba(139,92,246,.14),transparent 60%),
  radial-gradient(760px 460px at 0% 8%,rgba(79,102,245,.12),transparent 58%),
  var(--bg)}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:54px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;color:var(--brand-1);background:#fff;border:1px solid #e2e3f7;box-shadow:var(--shadow-sm);padding:7px 14px;border-radius:999px}
.hero__title{font-size:46px;line-height:1.18;font-weight:800;letter-spacing:-.5px;margin:20px 0 18px}
.hero__sub{font-size:17px;color:var(--ink-2);max-width:540px;margin-bottom:28px}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero__channels{font-size:13.5px;color:var(--muted)}
.hero__channels>span{display:block;margin-bottom:10px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips i{font-style:normal;font-size:13px;color:var(--ink-2);background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px 12px;box-shadow:var(--shadow-sm)}

/* 演示对话框 */
.hero__demo{display:flex;justify-content:center}
.chat{width:100%;max-width:400px;background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid var(--line);overflow:hidden;display:flex;flex-direction:column}
.chat__head{display:flex;align-items:center;gap:12px;padding:16px 18px;background:var(--grad);color:#fff}
.chat__avatar{width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.22);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:18px;flex-shrink:0}
.chat__who{display:flex;flex-direction:column;line-height:1.35;flex:1}
.chat__who strong{font-size:15.5px}
.chat__status{font-size:12px;opacity:.92;display:flex;align-items:center;gap:6px}
.dot{width:7px;height:7px;border-radius:50%;background:#4ade80;box-shadow:0 0 0 0 rgba(74,222,128,.6);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(74,222,128,.55)}70%{box-shadow:0 0 0 7px rgba(74,222,128,0)}100%{box-shadow:0 0 0 0 rgba(74,222,128,0)}}
.chat__tag{font-size:11px;background:rgba(255,255,255,.2);padding:3px 9px;border-radius:6px}
.chat__body{height:300px;overflow-y:auto;padding:18px;background:var(--bg-soft);display:flex;flex-direction:column;gap:12px;scroll-behavior:smooth}
.msg{display:flex;gap:9px;max-width:86%;animation:rise .3s ease}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.msg__av{width:28px;height:28px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700}
.msg.bot .msg__av{background:var(--grad);color:#fff}
.msg__txt{font-size:14.5px;line-height:1.6;padding:10px 14px;border-radius:14px;box-shadow:var(--shadow-sm)}
.msg.bot .msg__txt{background:#fff;color:var(--ink);border-top-left-radius:4px}
.msg.me{align-self:flex-end;flex-direction:row-reverse}
.msg.me .msg__av{background:#dde2f3;color:var(--brand-1)}
.msg.me .msg__txt{background:var(--grad);color:#fff;border-top-right-radius:4px}
.msg__txt b{color:var(--brand-1)}
.msg.me .msg__txt b{color:#fff;text-decoration:underline}
.typing{display:flex;gap:4px;padding:13px 16px}
.typing i{width:7px;height:7px;border-radius:50%;background:#c3cae0;animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.chat__quick{display:flex;flex-wrap:wrap;gap:7px;padding:12px 14px 4px;background:var(--bg-soft)}
.chat__quick button{font-size:12.5px;color:var(--brand-1);background:#fff;border:1px solid #dfe3f6;border-radius:999px;padding:6px 12px;cursor:pointer;transition:.18s}
.chat__quick button:hover{background:var(--brand-1);color:#fff;border-color:var(--brand-1)}
.chat__input{display:flex;gap:8px;padding:12px 14px;background:#fff;border-top:1px solid var(--line)}
.chat__input input{flex:1;border:1px solid var(--line);border-radius:11px;padding:11px 14px;font-size:14px;outline:none;transition:border-color .2s;font-family:inherit}
.chat__input input:focus{border-color:var(--brand-1)}
.chat__input button{width:44px;flex-shrink:0;border:0;border-radius:11px;background:var(--grad);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.18s}
.chat__input button:hover{transform:scale(1.05)}

/* ===== 数据条 ===== */
.stats{margin-top:-2px}
.stats__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;background:var(--ink);border-radius:var(--radius-lg);padding:34px 30px;color:#fff;box-shadow:var(--shadow-lg);position:relative;top:8px;
  background:linear-gradient(120deg,#1b2150,#2a2069)}
.stats__grid>div{text-align:center;position:relative}
.stats__grid>div::after{content:"";position:absolute;right:-10px;top:14%;height:72%;width:1px;background:rgba(255,255,255,.12)}
.stats__grid>div:last-child::after{display:none}
.stats__grid b{font-size:40px;font-weight:800;background:linear-gradient(120deg,#fff,#c9b8ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.stats__grid span{font-size:17px;font-weight:700;color:#c9b8ff;margin-left:2px}
.stats__grid p{font-size:13.5px;color:rgba(255,255,255,.72);margin-top:6px}

/* ===== 通用 section ===== */
.section{padding:84px 0}
.section--soft{background:var(--bg-soft)}
.section__head{text-align:center;max-width:680px;margin:0 auto 50px}
.section__eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--brand-1);background:var(--grad-soft);padding:6px 14px;border-radius:999px;margin-bottom:16px}
.section__eyebrow--light{color:#fff;background:rgba(255,255,255,.18)}
.section__head h2{font-size:34px;font-weight:800;letter-spacing:-.4px;line-height:1.3}
.section__head p{font-size:16.5px;color:var(--muted);margin-top:14px}

.grid{display:grid;gap:24px}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease,border-color .2s}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:#dfe3f7}

/* 功能卡 */
.feat__ico{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-bottom:18px;background:var(--grad-soft)}
.ico1{background:linear-gradient(135deg,#e0e7ff,#dbeafe)}
.ico2{background:linear-gradient(135deg,#ede9fe,#f3e8ff)}
.ico3{background:linear-gradient(135deg,#dcfce7,#d1fae5)}
.ico4{background:linear-gradient(135deg,#fef3c7,#fde68a)}
.ico5{background:linear-gradient(135deg,#cffafe,#cffafe)}
.ico6{background:linear-gradient(135deg,#fee2e2,#ffe4e6)}
.feat h3{font-size:19px;font-weight:700;margin-bottom:10px}
.feat p{font-size:14.8px;color:var(--ink-2);line-height:1.7}

/* 接入流程 */
.steps{display:flex;align-items:flex-start;justify-content:space-between;gap:6px}
.step{flex:1;text-align:center;padding:0 10px}
.step__no{width:56px;height:56px;margin:0 auto 18px;border-radius:50%;background:var(--grad);color:#fff;font-size:24px;font-weight:800;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 22px rgba(79,102,245,.32)}
.step h3{font-size:18px;font-weight:700;margin-bottom:8px}
.step p{font-size:14.5px;color:var(--ink-2)}
.step__line{flex:0 0 40px;height:2px;background:linear-gradient(90deg,#c7cef2,#d9c9f5);margin-top:27px;border-radius:2px}

/* 应用场景 */
.scene__ico{font-size:34px;margin-bottom:14px}
.scene h3{font-size:17.5px;font-weight:700;margin-bottom:8px}
.scene p{font-size:14px;color:var(--ink-2);line-height:1.65}

/* 价格 */
.pricing{align-items:stretch}
.plan{display:flex;flex-direction:column;position:relative;padding-top:34px}
.plan--featured{border:1.5px solid var(--brand-1);box-shadow:0 18px 44px rgba(79,102,245,.18);transform:translateY(-6px)}
.plan--featured:hover{transform:translateY(-10px)}
.plan__tag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12.5px;font-weight:700;padding:5px 16px;border-radius:999px;box-shadow:0 6px 14px rgba(79,102,245,.35);white-space:nowrap}
.plan__name{font-size:20px;font-weight:800}
.plan__price{margin:14px 0 6px;display:flex;align-items:baseline;gap:6px}
.plan__price b{font-size:38px;font-weight:800;color:var(--ink)}
.plan__price span{font-size:14.5px;color:var(--muted)}
.plan__desc{font-size:14px;color:var(--muted);margin-bottom:20px;padding-bottom:20px;border-bottom:1px dashed var(--line)}
.plan__list{display:flex;flex-direction:column;gap:12px;margin-bottom:26px;flex:1}
.plan__list li{font-size:14.5px;color:var(--ink-2);padding-left:26px;position:relative}
.plan__list li::before{content:"✓";position:absolute;left:0;top:0;width:18px;height:18px;color:var(--brand-1);font-weight:800}
.pricing__note{text-align:center;font-size:13px;color:var(--muted);margin-top:28px}

/* ===== 试用表单 ===== */
.trial{background:linear-gradient(135deg,#3b2c86 0%,#4F66F5 55%,#5b54d6 100%);color:#fff;position:relative;overflow:hidden}
.trial::before{content:"";position:absolute;width:480px;height:480px;border-radius:50%;background:radial-gradient(circle,rgba(139,92,246,.45),transparent 70%);top:-160px;right:-120px}
.trial::after{content:"";position:absolute;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(6,182,212,.3),transparent 70%);bottom:-150px;left:-100px}
.trial__grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.trial__intro h2{font-size:34px;font-weight:800;line-height:1.32;margin:16px 0 16px}
.trial__intro>p{font-size:16px;color:rgba(255,255,255,.86);max-width:440px}
.trial__points{margin:24px 0 30px;display:flex;flex-direction:column;gap:12px}
.trial__points li{font-size:15.5px;color:rgba(255,255,255,.95)}
.trial__contact{display:flex;flex-wrap:wrap;gap:14px}
.trial__contact-item{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:12px 18px;backdrop-filter:blur(6px)}
.trial__contact-ico{font-size:20px}
.trial__contact-item span:last-child{display:flex;flex-direction:column;line-height:1.4}
.trial__contact-item i{font-style:normal;font-size:12px;color:rgba(255,255,255,.7)}
.trial__contact-item b{font-size:14.5px}
a.trial__contact-item:hover{background:rgba(255,255,255,.2)}

.trial__formwrap{position:relative}
.leadform{background:#fff;border-radius:var(--radius-lg);padding:34px 30px;box-shadow:var(--shadow-lg)}
.leadform__title{font-size:21px;font-weight:800;color:var(--ink);margin-bottom:22px;text-align:center}
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink-2);margin-bottom:7px}
.field label em{color:#ef4444;font-style:normal}
.field input,.field textarea{width:100%;border:1px solid #dde1ee;border-radius:11px;padding:12px 14px;font-size:14.5px;color:var(--ink);outline:none;transition:border-color .2s,box-shadow .2s;font-family:inherit;background:#fff}
.field input:focus,.field textarea:focus{border-color:var(--brand-1);box-shadow:0 0 0 3px rgba(79,102,245,.12)}
.field input.invalid,.field textarea.invalid{border-color:#ef4444;box-shadow:0 0 0 3px rgba(239,68,68,.1)}
.field textarea{resize:vertical;min-height:74px}
.leadform__hint{font-size:12.5px;color:var(--muted);text-align:center;margin-top:14px;line-height:1.6}
.leadform__hint.ok{color:#16a34a;font-weight:600;font-size:14px}
.leadform__hint.err{color:#ef4444;font-weight:600;font-size:14px}
.leadform.is-done .field,.leadform.is-done .leadform__title{opacity:.55}
.btn[disabled]{opacity:.65;cursor:not-allowed;transform:none!important}

/* ===== 页脚 ===== */
.footer{background:#0e1230;color:#cbd2ec}
.footer__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:36px;padding:60px 24px 44px}
.footer__slogan{font-size:14px;color:#8d96bf;margin-top:16px;line-height:1.75}
.footer__col h4{font-size:15px;font-weight:700;color:#fff;margin-bottom:16px}
.footer__col a,.footer__contact{display:block;font-size:14px;color:#9aa3cb;margin-bottom:11px;transition:color .2s}
.footer__col a:hover{color:#fff}
.footer__bottom{border-top:1px solid rgba(255,255,255,.08)}
.footer__bottom-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:20px 24px;font-size:13px;color:#7e87b0}
.footer__icp{color:#7e87b0;transition:color .2s}
.footer__icp:hover{color:#cbd2ec}

/* ===== 悬浮按钮 ===== */
.fab{position:fixed;right:22px;bottom:26px;z-index:40;display:inline-flex;align-items:center;gap:8px;background:var(--grad);color:#fff;font-size:14.5px;font-weight:600;padding:13px 20px;border-radius:999px;box-shadow:0 12px 28px rgba(79,102,245,.45);transition:transform .2s,box-shadow .2s;animation:fabIn .5s ease}
.fab:hover{transform:translateY(-3px) scale(1.03);box-shadow:0 16px 34px rgba(79,102,245,.55)}
@keyframes fabIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* ===== 入场动画 ===== */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ===== 响应式 ===== */
@media (max-width:980px){
  .hero__grid{grid-template-columns:1fr;gap:40px}
  .hero__copy{text-align:center}
  .hero__sub{margin-left:auto;margin-right:auto}
  .hero__cta,.chips{justify-content:center}
  .hero__demo{order:-1}
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .trial__grid{grid-template-columns:1fr;gap:36px}
  .footer__grid{grid-template-columns:1fr 1fr;gap:30px}
}
@media (max-width:760px){
  .nav__links{position:fixed;top:68px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow);padding:8px 0;clip-path:inset(0 0 100% 0);transition:clip-path .3s ease}
  .nav__links.open{clip-path:inset(0 0 0 0)}
  .nav__links>a{padding:14px 24px;border-bottom:1px solid #f1f3fa}
  .nav__links .nav__cta{margin:10px 24px;justify-content:center}
  .nav__toggle{display:flex}
  .hero{padding:44px 0 56px}
  .hero__title{font-size:34px}
  .hero__sub{font-size:15.5px}
  .stats__grid{grid-template-columns:repeat(2,1fr);gap:24px 16px;padding:30px 20px}
  .stats__grid>div::after{display:none}
  .stats__grid b{font-size:32px}
  .section{padding:60px 0}
  .section__head{margin-bottom:38px}
  .section__head h2,.trial__intro h2{font-size:26px}
  .grid--3,.grid--4{grid-template-columns:1fr}
  .steps{flex-direction:column;gap:8px;max-width:320px;margin:0 auto}
  .step{display:flex;align-items:center;gap:16px;text-align:left;width:100%}
  .step__no{margin:0;flex-shrink:0;width:48px;height:48px;font-size:20px}
  .step__line{display:none}
  .plan--featured{transform:none}
  .plan--featured:hover{transform:translateY(-5px)}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__brand{grid-column:1/-1}
  .fab span{display:none}
  .fab{right:16px;bottom:18px;padding:14px}
}
@media (max-width:420px){
  .container{padding:0 18px}
  .hero__title{font-size:29px}
  .chat{max-width:100%}
  .footer__grid{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}