:root{
  --purple:#7C4DFF;
  --pink:#FF5E9C;
  --cyan:#18E0D8;
  --orange:#FF9F43;
  --yellow:#FFD93D;
  --ink:#1d1b3a;
  --ink-soft:#4a4768;
  --bg:#fbfaff;
  --card:#ffffff;
  --shadow:0 18px 50px -18px rgba(80,60,180,.35);
  --grad:linear-gradient(120deg,#7C4DFF,#FF5E9C 55%,#FF9F43);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.75;
  overflow-x:hidden;
}
.grad-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
  font-weight:900;
}
.container{max-width:1040px;margin:0 auto;padding:0 22px}

/* ===== 动态背景光斑 ===== */
.bg-orbs{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.orb{position:absolute;border-radius:50%;filter:blur(60px);opacity:.45;animation:float 16s ease-in-out infinite}
.orb-1{width:360px;height:360px;background:#b388ff;top:-80px;left:-60px;animation-delay:0s}
.orb-2{width:300px;height:300px;background:#ff8ac4;top:30%;right:-80px;animation-delay:3s}
.orb-3{width:320px;height:320px;background:#5de4dc;bottom:-100px;left:20%;animation-delay:6s}
.orb-4{width:260px;height:260px;background:#ffd36b;bottom:20%;right:18%;animation-delay:9s}
@keyframes float{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(40px,-30px) scale(1.1)}
  66%{transform:translate(-30px,25px) scale(.95)}
}

/* ===== 导航 ===== */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  display:flex;align-items:center;gap:18px;
  padding:16px 26px;
  transition:.35s;
}
.nav.scrolled{
  background:rgba(255,255,255,.82);
  backdrop-filter:blur(14px);
  box-shadow:0 6px 24px -12px rgba(80,60,180,.4);
}
.nav-logo{font-weight:900;font-size:20px;letter-spacing:.5px;color:var(--ink);text-decoration:none}
.nav-logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-links{display:flex;gap:22px;margin-left:auto}
.nav-links a{color:var(--ink-soft);text-decoration:none;font-weight:500;position:relative;transition:.2s}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:3px;border-radius:3px;background:var(--grad);transition:.25s}
.nav-links a:hover{color:var(--ink)}
.nav-links a:hover::after{width:100%}
.nav-cta{
  border:none;cursor:pointer;font-weight:700;color:#fff;
  background:var(--grad);padding:10px 18px;border-radius:999px;
  box-shadow:0 10px 24px -10px rgba(124,77,255,.7);transition:.2s;
  font-family:inherit;
}
.nav-cta:hover{transform:translateY(-2px) scale(1.04)}

/* ===== 英雄区 ===== */
.hero{
  min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:120px 22px 60px;position:relative;
}
.hero-badge{
  display:inline-block;font-weight:700;color:var(--purple);
  background:rgba(124,77,255,.1);border:1px solid rgba(124,77,255,.25);
  padding:8px 18px;border-radius:999px;margin-bottom:26px;font-size:14px;
  animation:pop .6s ease both;
}
.hero-title{
  font-size:clamp(38px,7vw,76px);line-height:1.12;font-weight:900;letter-spacing:-1px;
  margin-bottom:24px;animation:pop .7s .1s ease both;
}
.hero-sub{font-size:clamp(16px,2.4vw,20px);color:var(--ink-soft);max-width:640px;margin-bottom:34px;animation:pop .7s .2s ease both}
.hero-sub b{color:var(--pink)}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;justify-content:center;animation:pop .7s .3s ease both}
.btn{cursor:pointer;font-family:inherit;font-weight:700;border:none;font-size:16px;padding:14px 28px;border-radius:999px;transition:.25s}
.btn-primary{color:#fff;background:var(--grad);box-shadow:0 14px 30px -12px rgba(124,77,255,.7)}
.btn-primary:hover{transform:translateY(-3px) scale(1.04)}
.btn-ghost{background:#fff;color:var(--purple);border:2px solid rgba(124,77,255,.3)}
.btn-ghost:hover{transform:translateY(-3px);border-color:var(--purple)}
.hero-scroll{margin-top:54px;display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--ink-soft);font-size:13px;animation:pop .7s .5s ease both}
.mouse{width:24px;height:40px;border:2px solid rgba(80,60,180,.4);border-radius:14px;display:flex;justify-content:center;padding-top:7px}
.wheel{width:4px;height:8px;border-radius:4px;background:var(--purple);animation:wheel 1.4s infinite}
@keyframes wheel{0%{opacity:0;transform:translateY(-4px)}40%{opacity:1}100%{opacity:0;transform:translateY(10px)}}

@keyframes pop{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}

/* ===== 通用区块 ===== */
.section{padding:88px 0;position:relative}
.section.alt{background:linear-gradient(180deg,rgba(124,77,255,.05),rgba(255,94,156,.05))}
.lead{font-size:clamp(17px,2.3vw,21px);color:var(--ink-soft);margin:14px 0}
.lead.big{font-size:clamp(20px,3vw,28px);color:var(--ink);text-align:center;margin-top:30px}
.hl{background:linear-gradient(transparent 60%,rgba(255,217,61,.6) 0);padding:0 4px}
.sec-head{text-align:center;margin-bottom:46px}
.kicker{display:inline-block;font-weight:700;letter-spacing:2px;text-transform:uppercase;font-size:13px;color:var(--pink);margin-bottom:12px}
.sec-head h2{font-size:clamp(28px,5vw,46px);font-weight:900;line-height:1.2}

/* 滚动揭示 */
.reveal{opacity:0;transform:translateY(34px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.visible{opacity:1;transform:none}

/* ===== 开场气泡 ===== */
.quote-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin:30px 0}
.bubble{
  background:var(--card);border-radius:18px;padding:22px 24px;font-size:17px;font-weight:500;
  box-shadow:var(--shadow);position:relative;border:1px solid rgba(124,77,255,.08);
  transition:.3s;
}
.bubble::before{content:"💬";position:absolute;top:-14px;left:18px;font-size:22px}
.bubble:hover{transform:translateY(-6px) rotate(-1deg)}

/* ===== GEO 定义卡 ===== */
.geo-def{text-align:center;margin:10px 0 20px}
.def-card{
  max-width:760px;margin:18px auto;background:#fff;border-radius:20px;padding:26px 30px;
  font-size:clamp(18px,2.6vw,24px);font-weight:700;line-height:1.6;
  box-shadow:var(--shadow);border-left:6px solid transparent;
  background-image:linear-gradient(#fff,#fff),var(--grad);
  background-origin:border-box;background-clip:padding-box,border-box;
}
.def-card.small{font-size:17px;padding:16px 22px;max-width:680px}

/* ===== 图片 ===== */
.img-row{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:34px}
.photo{margin:0;background:#fff;padding:12px;border-radius:20px;box-shadow:var(--shadow);transition:.35s}
.photo:hover{transform:translateY(-6px)}
.photo img{width:100%;height:auto;display:block;border-radius:14px;background:#eee}
.photo.wide{max-width:820px;margin:30px auto}
.photo figcaption{text-align:center;color:var(--ink-soft);font-size:14px;padding:10px 4px 4px}

/* ===== 四问题卡片 ===== */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{
  position:relative;background:var(--card);border-radius:22px;padding:30px 26px 26px;
  box-shadow:var(--shadow);overflow:hidden;transition:.35s;border:1px solid rgba(124,77,255,.07);
}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:6px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:.4s}
.card:hover{transform:translateY(-10px)}
.card:hover::before{transform:scaleX(1)}
.card-num{position:absolute;top:14px;right:20px;font-size:46px;font-weight:900;color:rgba(124,77,255,.12)}
.card-ico{font-size:38px;margin-bottom:10px;display:inline-block;animation:wob 3s ease-in-out infinite}
@keyframes wob{0%,100%{transform:rotate(0)}25%{transform:rotate(-8deg)}75%{transform:rotate(8deg)}}
.card h3{font-size:20px;margin-bottom:12px}
.card p{color:var(--ink-soft);font-size:15px}
.card-point{margin-top:12px;padding-top:12px;border-top:1px dashed rgba(124,77,255,.2);color:var(--ink)!important;font-weight:600}
.mini{list-style:none;margin:12px 0 0;display:flex;flex-direction:column;gap:7px}
.mini li{position:relative;padding-left:22px;font-size:14.5px;color:var(--ink-soft)}
.mini li::before{content:"✓";position:absolute;left:0;top:0;color:#fff;background:var(--cyan);width:16px;height:16px;border-radius:50%;font-size:11px;display:flex;align-items:center;justify-content:center;font-weight:900}

/* ===== 步骤 ===== */
.step{display:flex;gap:22px;align-items:flex-start;margin:30px 0;background:#fff;border-radius:22px;padding:28px;box-shadow:var(--shadow)}
.step-no{
  flex:none;font-weight:900;font-size:15px;color:#fff;background:var(--grad);
  padding:12px 16px;border-radius:14px;writing-mode:initial;white-space:nowrap;
  box-shadow:0 10px 22px -10px rgba(124,77,255,.7);
}
.step-body{flex:1}
.step-body h3{font-size:23px;margin-bottom:12px}
.step-body p{color:var(--ink-soft);margin:10px 0}
.chip-row{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0}
.chip{background:rgba(124,77,255,.08);color:var(--purple);font-weight:600;font-size:14px;padding:7px 14px;border-radius:999px;border:1px solid rgba(124,77,255,.18);transition:.2s}
.chip:hover{background:var(--purple);color:#fff;transform:translateY(-2px)}
.mini-num{margin:12px 0 0 20px;color:var(--ink-soft)}
.mini-num li{margin:6px 0}

/* ===== 闭环 ===== */
.loop{margin-top:40px;text-align:center;background:linear-gradient(120deg,rgba(124,77,255,.08),rgba(255,94,156,.08));border-radius:24px;padding:36px 22px}
.loop h3{font-size:26px;margin-bottom:22px}
.loop-flow{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.loop-node{background:#fff;font-weight:700;padding:10px 16px;border-radius:12px;box-shadow:var(--shadow);font-size:15px}
.arrow{color:var(--pink);font-weight:900;font-size:18px}

/* ===== 工具 ===== */
.tool-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.tool{background:#fff;border-radius:24px;padding:32px;box-shadow:var(--shadow);transition:.35s;border:1px solid rgba(124,77,255,.08)}
.tool:hover{transform:translateY(-8px)}
.tool-ico{font-size:42px;margin-bottom:14px}
.tool h3{font-size:24px;margin-bottom:12px}
.tool p{color:var(--ink-soft);margin-bottom:18px}
.tool-link{display:inline-block;font-weight:700;color:var(--purple);text-decoration:none;border-bottom:2px solid transparent;transition:.2s}
.tool-link:hover{border-color:var(--purple)}

/* ===== 页脚 ===== */
.footer{text-align:center;padding:70px 22px 90px;background:linear-gradient(180deg,rgba(124,77,255,.06),rgba(255,94,156,.06))}
.footer-title{font-size:clamp(22px,4vw,32px);font-weight:900}
.footer-sub{color:var(--ink-soft);margin:10px 0 26px}

/* ===== 响应式 ===== */
@media(max-width:720px){
  .nav-links{display:none}
  .cards{grid-template-columns:1fr}
  .img-row{grid-template-columns:1fr}
  .step{flex-direction:column;gap:14px}
  .step-no{align-self:flex-start}
  .hero-title{font-size:40px}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important}
  .reveal{opacity:1;transform:none}
}