/* =========================================================
   AI获客大师 3.0 — 高端科技风 单页长屏 样式
   设计基准：移动端优先（Mobile First），逐级向 PC 自适应
   ========================================================= */

/* ---------- Design Tokens ---------- */
:root{
  --bg:#06080f;
  --bg-soft:#0a0e1a;
  --bg-alt:#080b16;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --line:rgba(255,255,255,.09);
  --text:#eaf0ff;
  --muted:rgba(234,240,255,.62);
  --muted-2:rgba(234,240,255,.58);
  --accent:#00e6a8;
  --accent-2:#22d3ee;
  --accent-3:#6e8bff;
  --danger:#ff6b81;
  --grad:linear-gradient(135deg,#00e6a8 0%,#22d3ee 55%,#6e8bff 115%);
  --grad-text:linear-gradient(110deg,#6ff5d2 0%,#22d3ee 55%,#8aa0ff 100%);
  --radius:16px;
  --radius-lg:22px;
  --shadow:0 24px 60px -28px rgba(0,0,0,.75);
  --glow:0 16px 44px -16px rgba(0,230,168,.40);
  --header-h:58px;
  --maxw:1200px;
  --ease:cubic-bezier(.22,.7,.2,1);
}

/* ---------- Reset ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 12px);-webkit-text-size-adjust:100%}
body{
  font-family:'Noto Sans SC',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'PingFang SC','Microsoft YaHei',sans-serif;
  background:var(--bg);color:var(--text);line-height:1.65;
  overflow-x:hidden;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select{font-family:inherit}
b{font-weight:700}
::selection{background:rgba(0,230,168,.3);color:#fff}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:20px}

/* ---------- Scroll progress ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:200;
  background:var(--grad);box-shadow:0 0 12px rgba(0,230,168,.6);
  transition:width .1s linear;
}

/* ---------- Background decor ---------- */
.bg-decor{position:fixed;inset:0;z-index:-1;overflow:hidden;background:
  radial-gradient(1200px 600px at 80% -10%,rgba(34,211,238,.10),transparent 60%),
  radial-gradient(1000px 700px at 0% 20%,rgba(110,139,255,.08),transparent 55%),
  linear-gradient(180deg,#06080f 0%,#080b16 45%,#06080f 100%);
}
.bg-grid{position:absolute;inset:0;opacity:.5;
  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:54px 54px;
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000 30%,transparent 80%);
          mask-image:radial-gradient(circle at 50% 30%,#000 30%,transparent 80%);
}
.bg-orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5;animation:float 18s ease-in-out infinite}
.bg-orb--1{width:420px;height:420px;background:rgba(0,230,168,.35);top:-80px;left:-100px}
.bg-orb--2{width:360px;height:360px;background:rgba(110,139,255,.30);top:40%;right:-120px;animation-delay:-6s}
.bg-orb--3{width:300px;height:300px;background:rgba(34,211,238,.25);bottom:-80px;left:30%;animation-delay:-12s}
@keyframes float{0%,100%{transform:translateY(0) translateX(0)}50%{transform:translateY(-40px) translateX(20px)}}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 22px;border-radius:999px;font-weight:700;font-size:15px;
  line-height:1;transition:transform .25s var(--ease),box-shadow .25s,background .25s,border-color .25s;
  white-space:nowrap;
}
.btn i{font-size:.95em}
.btn--primary{background:var(--grad);color:#04130e;box-shadow:var(--glow)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 22px 50px -14px rgba(0,230,168,.6)}
.btn--ghost{background:var(--surface);color:var(--text);border:1px solid var(--line)}
.btn--ghost:hover{background:var(--surface-2);border-color:rgba(0,230,168,.4);transform:translateY(-2px)}
.btn--lg{padding:16px 30px;font-size:16px}
.btn--sm{padding:9px 16px;font-size:13px}
.btn--block{width:100%}

/* ---------- Eyebrow / section heads ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:7px;
  font-size:13px;font-weight:600;letter-spacing:.04em;
  color:var(--accent);background:rgba(0,230,168,.08);
  border:1px solid rgba(0,230,168,.2);padding:6px 14px;border-radius:999px;
}
.section{padding:72px 0;position:relative;scroll-margin-top:var(--header-h)}
.section--alt{background:linear-gradient(180deg,rgba(255,255,255,.018),rgba(255,255,255,0))}
.section__head{text-align:center;max-width:720px;margin:0 auto 38px}
.section__head .eyebrow{margin-bottom:16px}
.section__title{
  font-size:clamp(1.55rem,5.6vw,2.6rem);font-weight:900;line-height:1.2;letter-spacing:-.01em;
}
.section__sub{margin-top:12px;color:var(--muted);font-size:clamp(.95rem,3.4vw,1.1rem)}

/* gradient text helper applied to key titles */
.hero__title,.section__title{background:none}

/* ---------- Header / Nav ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;height:var(--header-h);
  display:flex;align-items:center;
  padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);
  transition:background .3s,border-color .3s,backdrop-filter .3s;
  border-bottom:1px solid transparent;
}
.site-header.is-stuck{
  background:rgba(8,11,22,.78);backdrop-filter:blur(16px);
  border-bottom-color:var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:900;font-size:18px}
.brand__mark{
  width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  background:var(--grad);color:#04130e;font-size:14px;font-weight:900;box-shadow:var(--glow)
}
.brand__text b{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;margin-left:2px}
.nav__links{display:none}
.nav__toggle{display:flex;flex-direction:column;gap:5px;padding:8px}
.nav__toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s var(--ease)}
.nav__toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav__toggle.is-open span:nth-child(2){opacity:0}
.nav__toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* mobile drawer */
@media (max-width:1023px){
  .nav__links{
    position:fixed;top:var(--header-h);left:0;right:0;
    flex-direction:column;gap:2px;padding:14px 20px 24px;
    background:rgba(8,11,22,.96);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s var(--ease);
  }
  .nav__links.is-open{display:flex;transform:none;opacity:1;pointer-events:auto}
  .nav__links a{padding:13px 8px;font-size:16px;border-bottom:1px solid rgba(255,255,255,.05)}
  .nav__links .nav__cta{margin-top:10px;border-bottom:none;text-align:center;background:var(--grad);color:#04130e;border-radius:999px;font-weight:700}
}

/* ---------- HERO ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:center;
  padding:calc(var(--header-h) + 30px) 0 70px;text-align:center;
}
.hero__inner{display:flex;flex-direction:column;align-items:center}
.hero__title{
  font-size:clamp(2.6rem,14vw,5.5rem);font-weight:900;line-height:1.02;margin:18px 0 14px;letter-spacing:-.02em;
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero__badge{
  font-size:.34em;vertical-align:super;margin-left:8px;-webkit-text-fill-color:#04130e;
  background:var(--grad);padding:.18em .5em;border-radius:.5em;box-shadow:var(--glow)
}
.hero__lead{color:var(--muted);font-size:clamp(1rem,4vw,1.3rem);max-width:640px;margin-bottom:30px}
.hero__lead b{color:var(--text)}
.hero__actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-bottom:42px}

.platform-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;width:100%;max-width:540px;margin-bottom:40px}
.platform-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 14px;display:flex;flex-direction:column;align-items:center;gap:4px;
  transition:transform .3s var(--ease),border-color .3s,background .3s;
}
.platform-card i{font-size:26px;margin-bottom:6px}
.platform-card b{font-size:16px}
.platform-card span{font-size:12px;color:var(--muted-2)}
.platform-card:hover{transform:translateY(-4px);border-color:rgba(0,230,168,.4);background:var(--surface-2)}
.platform-card[data-p="douyin"] i{color:#fff}
.platform-card[data-p="kuaishou"] i{color:#ff7a00}
.platform-card[data-p="xhs"] i{color:#ff4060}
.platform-card[data-p="sph"] i{color:#19d35a}

.hero__stats{display:flex;gap:10px;width:100%;max-width:540px;margin-bottom:30px}
.stat{flex:1;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 8px}
.stat b{display:block;font-size:clamp(1.7rem,7vw,2.4rem);font-weight:900;line-height:1;
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat span{font-size:12.5px;color:var(--muted);margin-top:7px;display:block}

.hero__chips{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hero__chips li{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;color:var(--muted);
  background:var(--surface);border:1px solid var(--line);padding:8px 14px;border-radius:999px}
.hero__chips i{color:var(--accent)}

.hero__scroll{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);
  width:40px;height:40px;border-radius:50%;display:grid;place-items:center;
  border:1px solid var(--line);color:var(--muted);animation:bob 2s ease-in-out infinite}
@keyframes bob{0%,100%{transform:translate(-50%,0)}50%{transform:translate(-50%,8px)}}

/* ---------- Generic cards / grid ---------- */
.grid{display:grid;gap:16px}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--4{grid-template-columns:1fr}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:26px;transition:transform .3s var(--ease),border-color .3s,box-shadow .3s,background .3s;
}
.card:hover{transform:translateY(-5px);border-color:rgba(0,230,168,.35);box-shadow:var(--shadow);background:var(--surface-2)}
.card h3{font-size:1.18rem;font-weight:700;margin-bottom:9px}
.card p{color:var(--muted);font-size:.95rem}
.card.center{text-align:center;display:flex;flex-direction:column;align-items:center}
.card--row{display:flex;gap:18px;align-items:flex-start}
.card__icon{
  flex:none;width:58px;height:58px;border-radius:15px;display:grid;place-items:center;font-size:24px;
  color:var(--accent);background:linear-gradient(145deg,rgba(0,230,168,.18),rgba(0,230,168,.04));
  border:1px solid rgba(0,230,168,.2);margin-bottom:16px;
}
.card--row .card__icon,.card.center .card__icon{margin-bottom:14px}
.card--row .card__icon{margin-bottom:0}
.card__icon--sm{width:44px;height:44px;font-size:18px;border-radius:12px;margin-bottom:0}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.chips span{font-size:12px;color:var(--accent);background:rgba(0,230,168,.08);
  border:1px solid rgba(0,230,168,.2);padding:5px 11px;border-radius:999px}

/* ---------- Compare ---------- */
.compare{display:grid;gap:14px;position:relative;align-items:stretch}
.compare__card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:24px}
.compare__card--new{border-color:rgba(0,230,168,.35);background:linear-gradient(160deg,rgba(0,230,168,.06),rgba(255,255,255,.02))}
.compare__top{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.compare__icon{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;font-size:20px;
  background:var(--surface-2);border:1px solid var(--line)}
.compare__card--new .compare__icon{color:var(--accent);background:linear-gradient(145deg,rgba(0,230,168,.2),rgba(0,230,168,.04));border-color:rgba(0,230,168,.3)}
.compare__card--old .compare__icon{color:var(--muted)}
.compare__top h3{font-size:1.15rem;font-weight:700}
.tag{display:inline-block;font-size:11.5px;color:var(--muted-2);background:var(--surface-2);padding:3px 10px;border-radius:999px;margin-top:4px}
.tag--accent{color:var(--accent);background:rgba(0,230,168,.1)}
.compare__vs{align-self:center;justify-self:center;width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;font-weight:900;font-size:14px;color:#04130e;background:var(--grad);box-shadow:var(--glow);z-index:2}
.ticklist li{position:relative;padding:7px 0 7px 28px;color:var(--muted);font-size:.95rem;border-bottom:1px solid rgba(255,255,255,.05)}
.ticklist li:last-child{border-bottom:none}
.ticklist li::before{position:absolute;left:0;top:7px;font-family:"Font Awesome 6 Free";font-weight:900;font-size:.95em}
.ticklist--bad li::before{content:"\f00d";color:var(--danger)}
.ticklist--good li{color:var(--text)}
.ticklist--good li::before{content:"\f00c";color:var(--accent)}

.metric-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:26px}
.metric{text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 8px}
.metric b{display:block;font-size:clamp(1.6rem,6.5vw,2.3rem);font-weight:900;line-height:1;
  background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.metric span{font-size:12.5px;color:var(--muted);margin-top:7px;display:block}

/* ---------- Pain ---------- */
.pain__head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.pain__head h3{margin:0}
.dotlist li{position:relative;padding:6px 0 6px 18px;color:var(--muted);font-size:.93rem}
.dotlist li::before{content:"";position:absolute;left:0;top:14px;width:6px;height:6px;border-radius:50%;background:var(--accent-3)}
.pain__fix{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);color:var(--accent);font-weight:600;font-size:.92rem}
.pain__fix i{margin-right:5px}

/* ---------- Process ---------- */
.process{display:grid;gap:16px;counter-reset:step;list-style:none;padding:0}
.process__step{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px 22px;text-align:center}
.process__num{position:absolute;top:14px;right:18px;font-size:2.4rem;font-weight:900;color:rgba(255,255,255,.06);line-height:1}
.process__icon{width:60px;height:60px;margin:0 auto 14px;border-radius:16px;display:grid;place-items:center;font-size:24px;
  color:var(--accent);background:linear-gradient(145deg,rgba(0,230,168,.18),rgba(0,230,168,.04));border:1px solid rgba(0,230,168,.2)}
.process__step h4{font-size:1.1rem;margin-bottom:7px}
.process__step p{color:var(--muted);font-size:.9rem}

/* ---------- Engine / pill ---------- */
.engine{position:relative}
.pill{display:inline-flex;align-items:center;gap:6px;margin-top:14px;font-size:12.5px;font-weight:600;
  color:var(--accent);background:rgba(0,230,168,.08);border:1px solid rgba(0,230,168,.2);padding:6px 13px;border-radius:999px}
.pill--up{color:var(--accent-2);background:rgba(34,211,238,.08);border-color:rgba(34,211,238,.25)}

/* ---------- Guard ---------- */
.guard{display:grid;gap:24px;align-items:center}
.guard__visual{display:grid;place-items:center}
.guard__ring{width:200px;height:200px;border-radius:50%;display:grid;place-items:center;text-align:center;
  background:radial-gradient(circle at 50% 40%,rgba(0,230,168,.18),transparent 70%);
  border:2px solid rgba(0,230,168,.35);position:relative;animation:pulse 3s ease-in-out infinite}
.guard__ring::before{content:"";position:absolute;inset:-12px;border-radius:50%;border:1px dashed rgba(0,230,168,.3);animation:spin 18s linear infinite}
.guard__ring b{font-size:3.4rem;font-weight:900;line-height:1;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.guard__ring span{display:block;color:var(--muted);font-size:14px;margin-top:4px}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(0,230,168,.25)}50%{box-shadow:0 0 0 18px rgba(0,230,168,0)}}
@keyframes spin{to{transform:rotate(360deg)}}
.guard__list{display:grid;gap:12px}
.guard__item{display:flex;gap:14px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.guard__item h4{font-size:1.02rem;margin-bottom:3px}
.guard__item p{color:var(--muted);font-size:.88rem}

/* ---------- Cases ---------- */
.case__head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.case__industry{display:block;font-size:12px;color:var(--accent)}
.case__name{font-size:1.05rem}
.case__results{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}
.case__results>div{background:var(--surface-2);border-radius:12px;padding:12px;text-align:center}
.case__results b{display:block;font-size:1.5rem;font-weight:900;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.case__results span{font-size:11.5px;color:var(--muted)}
.logos{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:28px}
.logos span{font-size:13px;color:var(--muted-2);background:var(--surface);border:1px solid var(--line);padding:8px 16px;border-radius:999px}

/* ---------- Demo ---------- */
.demo{display:grid;gap:24px}
.demo__screen{background:linear-gradient(160deg,rgba(255,255,255,.06),rgba(255,255,255,.02));border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow)}
.demo__bar{display:flex;align-items:center;gap:7px;padding:14px 18px;border-bottom:1px solid var(--line);background:rgba(0,0,0,.25)}
.demo__bar b{margin-left:8px;font-size:13px;color:var(--muted)}
.demo__dot{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.18)}
.demo__dot:nth-child(1){background:#ff5f57}.demo__dot:nth-child(2){background:#febc2e}.demo__dot:nth-child(3){background:#28c840}
.demo__chat{padding:20px;display:flex;flex-direction:column;gap:14px}
.bubble{display:flex;gap:10px;align-items:flex-start;max-width:90%}
.bubble__avatar{flex:none;width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-size:14px}
.bubble p{padding:11px 15px;border-radius:14px;font-size:.9rem;line-height:1.55}
.bubble--ai{align-self:flex-start}
.bubble--ai .bubble__avatar{background:linear-gradient(145deg,rgba(0,230,168,.25),rgba(0,230,168,.05));color:var(--accent)}
.bubble--ai p{background:var(--surface-2);border:1px solid var(--line);border-top-left-radius:4px}
.bubble--ai p b{color:var(--accent)}
.bubble--user{align-self:flex-end;flex-direction:row-reverse}
.bubble--user .bubble__avatar{background:var(--grad);color:#04130e}
.bubble--user p{background:rgba(110,139,255,.16);border:1px solid rgba(110,139,255,.3);border-top-right-radius:4px}
.demo__side h3{font-size:1.25rem;margin-bottom:16px;color:var(--accent)}
.demo__side .btn{margin-top:20px}

/* ---------- Pricing ---------- */
.pricing{align-items:stretch}
.price{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:30px 26px;display:flex;flex-direction:column}
.price--popular{border-color:rgba(0,230,168,.45);background:linear-gradient(170deg,rgba(0,230,168,.08),rgba(255,255,255,.02));box-shadow:var(--shadow),var(--glow)}
.price__flag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#04130e;font-size:12px;font-weight:700;padding:5px 16px;border-radius:999px;white-space:nowrap}
.price__name{font-size:1.2rem;font-weight:700}
.price__num{font-size:2.3rem;font-weight:900;margin:10px 0 2px;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.price__num span{font-size:.9rem;font-weight:500;color:var(--muted-2);-webkit-text-fill-color:var(--muted-2)}
.price__desc{color:var(--muted);font-size:.9rem;margin-bottom:18px}
.plan{flex:1;margin-bottom:22px}
.plan li{position:relative;padding:9px 0 9px 26px;font-size:.92rem;border-bottom:1px solid rgba(255,255,255,.05)}
.plan li::before{position:absolute;left:0;top:9px;font-family:"Font Awesome 6 Free";font-weight:900;font-size:.85em}
.plan li.ok::before{content:"\f00c";color:var(--accent)}
.plan li.no{color:var(--muted-2)}
.plan li.no::before{content:"\f00d";color:var(--muted-2)}

/* ---------- FAQ ---------- */
.faq{display:grid;gap:12px;max-width:860px;margin:0 auto}
.faq__item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.faq__item summary{display:flex;align-items:center;gap:12px;padding:18px 20px;font-weight:600;font-size:1.02rem;cursor:pointer;list-style:none}
.faq__item summary::-webkit-details-marker{display:none}
.faq__item summary>i:first-child{color:var(--accent);width:20px;text-align:center}
.faq__arrow{margin-left:auto;color:var(--muted-2);transition:transform .3s var(--ease);font-size:.85em}
.faq__item[open] .faq__arrow{transform:rotate(180deg)}
.faq__item[open]{border-color:rgba(0,230,168,.3)}
.faq__item p{padding:0 20px 20px 52px;color:var(--muted);font-size:.93rem}
.badges{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:30px}
.badges span{display:inline-flex;align-items:center;gap:8px;font-size:13.5px;color:var(--muted);
  background:var(--surface);border:1px solid var(--line);padding:10px 18px;border-radius:999px}
.badges i{color:var(--accent)}

/* ---------- CTA ---------- */
.cta{background:linear-gradient(180deg,rgba(0,230,168,.08),rgba(110,139,255,.08))}
.promo{display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;
  background:linear-gradient(135deg,rgba(255,107,129,.14),rgba(255,159,67,.1));
  border:1px solid rgba(255,107,129,.3);border-radius:var(--radius-lg);padding:20px;margin-bottom:34px}
.promo>i{font-size:22px;color:#ff9f43}
.promo>span{font-weight:700;font-size:clamp(.95rem,3.6vw,1.15rem)}
.promo__timer{display:flex;gap:8px}
.promo__timer>div{background:rgba(0,0,0,.35);border:1px solid var(--line);border-radius:10px;padding:8px 12px;min-width:48px;text-align:center}
.promo__timer b{display:block;font-size:1.4rem;font-weight:900;color:#ff9f43;font-variant-numeric:tabular-nums}
.promo__timer span{font-size:11px;color:var(--muted)}
.cta__grid{display:grid;gap:26px}
.cta__copy .section__title{text-align:left}
.cta__lead{color:var(--muted);font-size:1.1rem;margin:10px 0 18px}
.cta__copy .ticklist{margin-bottom:22px}
.cta__stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.cta__stats>div{text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 6px}
.cta__stats b{display:block;font-size:1.6rem;font-weight:900;background:var(--grad-text);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.cta__stats span{font-size:12px;color:var(--muted)}

/* lead form */
.leadform{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:28px 24px;box-shadow:var(--shadow)}
.leadform h3{font-size:1.35rem;font-weight:800}
.leadform__sub{color:var(--muted);font-size:.92rem;margin:6px 0 20px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:7px}
.field input,.field select{
  width:100%;padding:13px 15px;border-radius:12px;font-size:16px;color:var(--text);
  background:rgba(0,0,0,.28);border:1px solid var(--line);transition:border-color .25s,box-shadow .25s;
}
.field input::placeholder{color:var(--muted-2)}
.field input:focus,.field select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,230,168,.15)}
.field select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%2300e6a8' d='M6 8 0 0h12z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center}
.field select option{background:#0b1020;color:#eaf0ff}
.field select option:disabled{color:rgba(234,240,255,.45)}
.field input.invalid,.field select.invalid{border-color:var(--danger);box-shadow:0 0 0 3px rgba(255,107,129,.15)}
.leadform__hint{margin-top:14px;text-align:center;font-size:12.5px;color:var(--muted-2)}
.leadform__hint i{color:var(--accent)}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--line);padding:48px 0 calc(110px + env(safe-area-inset-bottom));background:var(--bg-alt)}
.footer__grid{display:grid;gap:30px}
.footer__brand p{color:var(--muted);font-size:.9rem;margin-top:14px;max-width:340px}
.footer__col h4{font-size:1rem;margin-bottom:14px}
.footer__col a{display:block;color:var(--muted);font-size:.9rem;padding:5px 0;transition:color .2s}
.footer__col a:hover{color:var(--accent)}
.footer__contact p{color:var(--muted);font-size:.9rem;margin-bottom:8px}
.footer__contact i{color:var(--accent);margin-right:6px}
.footer__contact b{color:var(--text)}
.footer__contact .btn{margin-top:8px}
.footer .btn--primary,.footer .btn--primary:hover{color:#04130e}
.footer .btn--ghost,.footer .btn--ghost:hover{color:var(--text)}
.footer__bottom{border-top:1px solid var(--line);margin-top:36px;padding-top:22px;text-align:center;color:var(--muted-2);font-size:12.5px}
.footer__bottom p{margin:4px 0}
.footer__icp a{color:var(--muted-2)}

/* ---------- Floating dock (转化悬浮按钮) ---------- */
.dock{
  position:fixed;left:0;right:0;bottom:0;z-index:130;
  display:flex;gap:1px;padding:8px 10px calc(8px + env(safe-area-inset-bottom));
  background:rgba(8,11,22,.92);backdrop-filter:blur(16px);border-top:1px solid var(--line);
}
.dock__btn{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  padding:8px 4px;border-radius:12px;font-size:11.5px;color:var(--muted);transition:.25s var(--ease)}
.dock__btn i{font-size:18px}
.dock__btn--primary{background:var(--grad);color:#04130e;font-weight:700;box-shadow:var(--glow)}
.dock__btn:not(.dock__btn--primary):active{background:var(--surface-2)}
.dock__top{position:fixed;right:14px;bottom:calc(80px + env(safe-area-inset-bottom));
  width:46px;height:46px;flex:none;border-radius:50%;background:rgba(8,11,22,.9);border:1px solid var(--line);
  opacity:0;transform:scale(.6);pointer-events:none}
.dock__top span{display:none}
.dock__top.is-show{opacity:1;transform:scale(1);pointer-events:auto}

/* ---------- Modal ---------- */
.modal{position:fixed;inset:0;z-index:160;display:grid;place-items:center;padding:20px}
.modal[hidden]{display:none}
.modal__mask{position:absolute;inset:0;background:rgba(0,0,0,.7);backdrop-filter:blur(4px)}
.modal__box{position:relative;width:100%;max-width:340px;text-align:center;
  background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px 26px;box-shadow:var(--shadow);
  animation:pop .3s var(--ease)}
@keyframes pop{from{opacity:0;transform:translateY(16px) scale(.96)}to{opacity:1;transform:none}}
.modal__close{position:absolute;top:14px;right:16px;font-size:20px;color:var(--muted)}
.modal__wx{font-size:46px;color:#19d35a;margin-bottom:10px}
.modal__box h3{font-size:1.2rem;margin-bottom:4px}
.modal__box>p{color:var(--muted);font-size:.88rem}
.modal__wxid{display:flex;align-items:center;justify-content:center;gap:12px;margin:12px 0;
  background:var(--surface-2);border:1px dashed rgba(0,230,168,.4);border-radius:12px;padding:14px}
.modal__wxid b{font-size:1.25rem;letter-spacing:.04em;color:var(--accent)}
.modal__tip{font-size:12.5px;color:var(--muted-2);margin-top:6px}

/* ---------- Toast ---------- */
.toast{position:fixed;left:50%;bottom:96px;z-index:200;
  transform:translateX(-50%) translateY(20px);
  background:rgba(8,11,22,.96);border:1px solid rgba(0,230,168,.4);color:var(--text);
  padding:13px 22px;border-radius:999px;font-size:14px;font-weight:600;box-shadow:var(--shadow);
  opacity:0;pointer-events:none;transition:.35s var(--ease)}
.toast i{color:var(--accent);margin-right:7px}
.toast[hidden]{display:none}
.toast.is-show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- Reveal animations ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* =========================================================
   响应式：平板 ≥640px
   ========================================================= */
@media (min-width:640px){
  .platform-cards{grid-template-columns:repeat(4,1fr);max-width:680px}
  .grid--2{grid-template-columns:repeat(2,1fr)}
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .section{padding:80px 0}
  .compare{grid-template-columns:1fr auto 1fr;align-items:stretch}
  .compare__vs{margin:0}
  .process{grid-template-columns:repeat(2,1fr)}
  .case__results{gap:12px}
  /* 平板：底部转化条居中、按钮不过宽 */
  .dock{justify-content:center;gap:8px}
  .dock__btn{flex:0 1 150px}
  .dock__top{flex:none}
}

/* =========================================================
   桌面 PC ≥1024px —— 拓宽信息密度，内容顺序不变
   ========================================================= */
@media (min-width:1024px){
  :root{--header-h:70px}
  .section{padding:96px 0}
  .container{padding-inline:32px}

  /* nav inline */
  .nav__toggle{display:none}
  .nav__links{display:flex;align-items:center;gap:6px}
  .nav__links a{padding:9px 14px;font-size:14.5px;color:var(--muted);border-radius:999px;transition:color .2s,background .2s}
  .nav__links a:hover,.nav__links a.is-active{color:var(--text);background:var(--surface)}
  .nav__links .nav__cta{margin-left:10px;background:var(--grad);color:#04130e;font-weight:700}
  .nav__links .nav__cta:hover{color:#04130e;background:var(--grad);transform:translateY(-1px)}

  .grid{gap:24px}
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(4,1fr)}
  .process{grid-template-columns:repeat(4,1fr)}
  .guard{grid-template-columns:280px 1fr;gap:40px}
  .guard__list{max-width:560px}
  .demo{grid-template-columns:1.15fr 1fr;align-items:center}
  .demo__side{max-width:440px}
  .cta__grid{grid-template-columns:1.05fr .95fr;align-items:start}
  .cta__copy{max-width:520px}
  .leadform{max-width:440px;margin-left:auto}
  .footer__grid{grid-template-columns:1.6fr 1fr 1fr 1.2fr}
  .section__head{margin-bottom:52px}

  /* dock → 右侧竖向悬浮（停靠在版心外侧留白区，避免遮挡内容） */
  .dock{
    left:auto;right:max(16px,calc((100% - var(--maxw)) / 2 - 76px));bottom:auto;top:50%;transform:translateY(-50%);
    flex-direction:column;gap:10px;padding:0;background:none;backdrop-filter:none;border:none;
  }
  .dock__btn{flex:none;width:64px;height:64px;border-radius:16px;font-size:11px;
    background:rgba(8,11,22,.85);border:1px solid var(--line);backdrop-filter:blur(10px);box-shadow:var(--shadow)}
  .dock__btn:hover{transform:translateX(-3px);border-color:rgba(0,230,168,.5);color:var(--text)}
  .dock__btn--primary{background:var(--grad);color:#04130e}
  .dock__btn--primary:hover{color:#04130e}
  .dock__top{position:relative;right:auto;bottom:auto;width:64px;height:64px;border-radius:16px}
  .dock__top span{display:block}
}

@media (min-width:1280px){:root{--maxw:1240px}}
@media (min-width:1600px){:root{--maxw:1360px}}
@media (min-width:1920px){:root{--maxw:1480px}}

/* 中窄桌面（版心留白不足以容纳悬浮条时）：右侧预留空间，hero 仍居中 */
@media (min-width:1024px) and (max-width:1439px){
  .container{padding-right:96px}
  .hero .container{padding-inline:96px}
}

/* 键盘焦点可见 */
.btn:focus-visible,
.dock__btn:focus-visible,
.nav__links a:focus-visible,
.faq__item summary:focus-visible,
.hero__scroll:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.modal__close:focus-visible,
.field input:focus-visible,
.field select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* 矮屏 / 横屏 弹层适配 */
@media (max-height:520px){
  .modal__box{padding:20px 18px}
  .modal__wx{font-size:36px;margin-bottom:6px}
}

/* 弹层关闭动画 */
.modal.is-closing .modal__box{animation:popOut .22s var(--ease) forwards}
@keyframes popOut{to{opacity:0;transform:translateY(12px) scale(.96)}}

/* 窄屏精细适配（≤400px 小机型，防止溢出与拥挤） */
@media (max-width:400px){
  .hero__actions{gap:10px}
  .hero__actions .btn{padding:14px 18px;font-size:14px}
  .platform-cards{gap:10px}
  .hero__stats{gap:8px}
  .stat{padding:14px 6px}
  .hero__chips li{padding:9px 13px}
  .promo__timer{gap:5px}
  .promo__timer>div{min-width:42px;padding:7px 8px}
  .promo__timer b{font-size:1.2rem}
  .leadform{padding:22px 18px}
  .field input,.field select{padding:12px 13px}
  .dock__btn{font-size:10.5px;padding:7px 2px}
  .dock__btn i{font-size:17px}
}
@media (max-width:340px){
  .platform-cards{grid-template-columns:1fr}
}

/* =========================================================
   可访问性：尊重「减少动态效果」
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}