/* ============ Graviflow · 深色科技风 ============ */
:root{
  --bg:#05070f;
  --bg-2:#070b18;
  --panel:rgba(255,255,255,.045);
  --panel-2:rgba(255,255,255,.07);
  --line:rgba(140,180,255,.14);
  --line-2:rgba(140,180,255,.28);
  --text:#e9f1ff;
  --text-2:#a9bcdc;
  --muted:#7d92b8;
  --cyan:#21c7ff;
  --cyan-l:#5bf3ff;
  --blue:#2e6bff;
  --grad:linear-gradient(100deg,#5bf3ff 0%,#21c7ff 45%,#2e6bff 100%);
  --radius:18px;
  --shadow:0 24px 70px rgba(0,0,0,.55);
  --mx:50%; --my:50%;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--text);
  font-family:Inter,system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  line-height:1.65; -webkit-font-smoothing:antialiased; overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1240px,92vw);margin:0 auto}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- 背景 ---------- */
.bg-layer{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.grid-lines{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(120,170,255,.055) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(120,170,255,.055) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 65% at 50% 0%,#000 30%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 90% 65% at 50% 0%,#000 30%,transparent 78%);
}
.glow{position:absolute;border-radius:50%;filter:blur(110px);opacity:.5}
.glow-1{width:620px;height:620px;top:-220px;left:-120px;background:radial-gradient(circle,#1d5cff,transparent 70%)}
.glow-2{width:560px;height:560px;top:-140px;right:-160px;background:radial-gradient(circle,#00b7ff,transparent 70%)}
.glow-3{width:680px;height:680px;top:52%;left:38%;background:radial-gradient(circle,#123a9e,transparent 72%);opacity:.28}
#stars{position:absolute;inset:0;width:100%;height:100%;opacity:.55}
body>*:not(.bg-layer){position:relative;z-index:1}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.62rem 1.25rem;border-radius:999px;font-size:.9rem;font-weight:600;
  border:1px solid transparent;cursor:pointer;transition:.25s;white-space:nowrap;
}
.btn-lg{padding:.85rem 1.8rem;font-size:.98rem}
.btn-full{width:100%}
.btn-primary{background:var(--grad);color:#04101f;box-shadow:0 8px 26px rgba(33,199,255,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 38px rgba(33,199,255,.42)}
.btn-outline{border-color:var(--line-2);color:var(--text);background:rgba(255,255,255,.03)}
.btn-outline:hover{border-color:var(--cyan);color:var(--cyan-l);background:rgba(33,199,255,.08)}
.btn-ghost{color:var(--text-2)}
.btn-ghost:hover{color:var(--text)}

/* ---------- 导航 ---------- */
.nav{position:sticky;top:0;z-index:50;transition:.3s}
.nav.scrolled{
  background:rgba(6,10,22,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
}
.nav-inner{width:min(1240px,92vw);margin:0 auto;height:84px;display:flex;align-items:center;gap:2rem}
.brand img{height:66px;width:auto}
.nav-links{display:flex;gap:1.9rem;margin-left:1rem}
.nav-links a{font-size:.9rem;color:var(--text-2);transition:.2s;position:relative}
.nav-links a:hover{color:var(--text)}
.nav-links a::after{
  content:'';position:absolute;left:0;right:100%;bottom:-6px;height:1px;background:var(--grad);transition:right .25s
}
.nav-links a:hover::after{right:0}
.nav-actions{margin-left:auto;display:flex;gap:.6rem;align-items:center}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;margin-left:auto;flex-direction:column;gap:5px}
.nav-toggle span{width:22px;height:2px;background:var(--text);display:block;border-radius:2px}

/* ---------- Hero ---------- */
.hero{padding:clamp(3rem,7vw,6.5rem) 0 4rem}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:3.5rem;align-items:center}
.badge{
  display:inline-flex;align-items:center;gap:.55rem;padding:.4rem .95rem;border-radius:999px;
  background:rgba(33,199,255,.09);border:1px solid rgba(33,199,255,.26);
  font-size:.8rem;color:var(--cyan-l);letter-spacing:.02em;
}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan-l);box-shadow:0 0 12px var(--cyan-l);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}
.hero h1{
  font-size:clamp(2.3rem,5.2vw,4rem);line-height:1.14;font-weight:800;letter-spacing:-.02em;margin:1.4rem 0 1.2rem;
}
.hero-sub{color:var(--text-2);font-size:clamp(1rem,1.25vw,1.08rem);max-width:36rem}
.hero-cta{display:flex;gap:.9rem;margin:2rem 0;flex-wrap:wrap}
.hero-stats{display:flex;gap:2.4rem;padding-top:1.6rem;border-top:1px solid var(--line)}
.hero-stats b{display:block;font-size:1.75rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats span{font-size:.8rem;color:var(--muted)}

/* 产品演示窗 */
.hero-screen{position:relative}
.screen{
  position:relative;border-radius:20px;overflow:hidden;
  background:linear-gradient(180deg,rgba(18,28,55,.92),rgba(8,13,28,.96));
  border:1px solid var(--line-2);box-shadow:var(--shadow);
  backdrop-filter:blur(10px);
}
.screen-bar{display:flex;align-items:center;gap:7px;padding:.85rem 1.1rem;border-bottom:1px solid var(--line);background:rgba(255,255,255,.03)}
.tl{width:10px;height:10px;border-radius:50%;display:block}
.tl-r{background:#ff5f57}.tl-y{background:#ffbd2e}.tl-g{background:#28c840}
.screen-title{margin-left:.7rem;font-size:.78rem;color:var(--muted);letter-spacing:.05em}
.screen-body{display:grid;grid-template-columns:132px 1fr;min-height:330px}
.sc-side{border-right:1px solid var(--line);padding:.9rem .7rem;background:rgba(0,0,0,.18)}
.sc-side-h{font-size:.7rem;color:var(--muted);letter-spacing:.08em;margin-bottom:.6rem;padding-left:.3rem}
.sc-item{display:flex;gap:.55rem;align-items:center;padding:.5rem .45rem;border-radius:10px;cursor:default}
.sc-item.active{background:rgba(33,199,255,.12);border:1px solid rgba(33,199,255,.22)}
.ava{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:.72rem;font-weight:700;background:var(--grad);color:#04101f;flex:none}
.ava.b{background:linear-gradient(135deg,#7b8cff,#4b5bd6);color:#fff}
.ava.c{background:linear-gradient(135deg,#3ecf8e,#2aa06d);color:#fff}
.sc-n{font-size:.76rem;font-weight:600}
.sc-t{font-size:.68rem;color:var(--muted);max-width:78px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sc-time{margin-left:auto;font-size:.62rem;color:var(--muted)}
.sc-tag{margin-top:1rem;font-size:.7rem;color:var(--cyan-l);background:rgba(33,199,255,.1);border:1px solid rgba(33,199,255,.2);border-radius:999px;padding:.28rem .6rem;text-align:center}
.sc-main{padding:1.1rem;display:flex;flex-direction:column;gap:.7rem}
.msg{
  max-width:84%;padding:.62rem .85rem;border-radius:14px;font-size:.82rem;line-height:1.6;
  border:1px solid var(--line);background:rgba(255,255,255,.05);
}
.msg.me{
  align-self:flex-end;background:linear-gradient(120deg,rgba(33,199,255,.16),rgba(46,107,255,.14));
  border-color:rgba(33,199,255,.3);
}
.msg.them{align-self:flex-start}
.typing::after{content:'▍';animation:blink 1s steps(1) infinite;color:var(--cyan-l)}
@keyframes blink{50%{opacity:0}}
.meta-row{display:flex;gap:.4rem;flex-wrap:wrap;margin-top:.2rem;transition:opacity .5s}
.chip{
  font-size:.66rem;padding:.22rem .55rem;border-radius:6px;
  background:rgba(255,255,255,.06);border:1px solid var(--line);color:var(--text-2)
}
.chip-cyan{background:rgba(33,199,255,.12);border-color:rgba(33,199,255,.3);color:var(--cyan-l)}
.chip-blue{background:rgba(46,107,255,.14);border-color:rgba(46,107,255,.32);color:#8fb0ff}
.sc-foot{margin-top:auto;display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem;padding-top:.8rem;border-top:1px solid var(--line)}
.sc-kpi{text-align:center}
.sc-kpi b{display:block;font-size:.62rem;color:var(--muted);font-weight:500}
.sc-kpi span{font-size:1.05rem;font-weight:800;color:var(--cyan-l)}
.screen-shadow{
  position:absolute;inset:auto 8% -28px 8%;height:80px;border-radius:50%;
  background:radial-gradient(ellipse,rgba(33,199,255,.35),transparent 70%);filter:blur(30px);z-index:-1
}

/* ---------- 区块通用 ---------- */
.section{padding:clamp(4rem,8vw,7rem) 0}
.section-alt{background:linear-gradient(180deg,transparent,rgba(10,16,34,.6),transparent)}
.sec-head{text-align:center;max-width:44rem;margin:0 auto 3.2rem}
.eyebrow{
  display:inline-block;font-size:.72rem;letter-spacing:.22em;color:var(--cyan);
  padding:.3rem .8rem;border:1px solid rgba(33,199,255,.24);border-radius:999px;
  background:rgba(33,199,255,.07);margin-bottom:1.1rem;
}
.sec-head h2{font-size:clamp(1.8rem,3.4vw,2.7rem);font-weight:800;letter-spacing:-.015em;line-height:1.25}
.sec-head p{color:var(--text-2);margin-top:.9rem}

/* ---------- 能力卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
.card{
  position:relative;padding:1.7rem;border-radius:var(--radius);overflow:hidden;
  background:var(--panel);border:1px solid var(--line);transition:.3s;
}
.card::before{
  content:'';position:absolute;inset:0;opacity:0;transition:opacity .35s;
  background:radial-gradient(420px circle at var(--mx) var(--my),rgba(33,199,255,.16),transparent 60%);
}
.card:hover{transform:translateY(-4px);border-color:var(--line-2);background:var(--panel-2)}
.card:hover::before{opacity:1}
.card h3{font-size:1.08rem;font-weight:700;margin:.9rem 0 .55rem}
.card p{color:var(--text-2);font-size:.9rem}
.ic{
  width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:1.3rem;
  background:linear-gradient(140deg,rgba(33,199,255,.18),rgba(46,107,255,.12));
  border:1px solid rgba(33,199,255,.24);
}

/* ---------- 渠道 ---------- */
.channel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.9rem}
.channel-chip{
  position:relative;padding:1rem;border-radius:14px;background:var(--panel);
  border:1px solid var(--line);text-align:center;font-size:.92rem;font-weight:600;transition:.25s
}
.channel-chip:hover{transform:translateY(-3px);border-color:var(--line-2);background:var(--panel-2)}
.channel-chip em{display:block;font-style:normal;font-size:.7rem;color:var(--muted);font-weight:500;margin-top:.2rem}
.channel-chip.hot{border-color:rgba(33,199,255,.42);background:linear-gradient(180deg,rgba(33,199,255,.1),rgba(46,107,255,.05))}
.channel-chip.new{border-color:rgba(91,243,255,.34);background:rgba(91,243,255,.06)}
.channel-note{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-top:1.6rem}
.channel-note div{padding:1.1rem 1.2rem;border-radius:14px;background:var(--panel);border:1px solid var(--line)}
.channel-note b{display:block;font-size:.95rem;font-weight:700;margin-bottom:.25rem}
.channel-note span{font-size:.84rem;color:var(--text-2)}

/* ---------- 流水线 ---------- */
.pipe-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.pipe{
  padding:1.5rem 1.3rem;border-radius:var(--radius);background:var(--panel);
  border:1px solid var(--line);transition:.3s
}
.pipe:hover{transform:translateY(-3px);border-color:var(--line-2);background:var(--panel-2)}
.pipe-n{font-size:.75rem;font-weight:800;color:var(--cyan);letter-spacing:.1em}
.pipe h3{font-size:1.05rem;font-weight:700;margin:.5rem 0 .5rem}
.pipe p{font-size:.85rem;color:var(--text-2)}
.ext-box{
  margin-top:1.4rem;padding:1.8rem;border-radius:22px;display:grid;grid-template-columns:1.2fr .8fr;
  gap:2rem;align-items:center;
  background:linear-gradient(120deg,rgba(33,199,255,.09),rgba(46,107,255,.05));
  border:1px solid rgba(33,199,255,.26)
}
.ext-l h3{font-size:1.15rem;font-weight:800;margin-bottom:.5rem}
.ext-l p{font-size:.9rem;color:var(--text-2)}
.ext-r{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:flex-end}
.ext-tag{
  font-size:.8rem;padding:.45rem .9rem;border-radius:999px;
  background:rgba(255,255,255,.06);border:1px solid var(--line-2);color:var(--cyan-l)
}

/* ---------- 流程 ---------- */
.flow{display:flex;align-items:stretch;gap:.5rem;flex-wrap:wrap;justify-content:center}
.flow-step{
  flex:1 1 170px;min-width:150px;padding:1.5rem 1.2rem;border-radius:var(--radius);
  background:var(--panel);border:1px solid var(--line);text-align:center;transition:.3s
}
.flow-step:hover{border-color:var(--line-2);transform:translateY(-3px)}
.flow-step .num{font-size:.78rem;font-weight:800;color:var(--cyan);letter-spacing:.08em}
.flow-step h4{font-size:1rem;margin:.5rem 0 .4rem;font-weight:700}
.flow-step p{font-size:.82rem;color:var(--text-2)}
.flow-arrow{display:grid;place-items:center;color:var(--cyan);font-size:1.3rem;opacity:.6;flex:0 0 auto}

/* ---------- 场景 ---------- */
.scenes{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.scene{
  padding:1.6rem;border-radius:var(--radius);background:var(--panel);
  border:1px solid var(--line);transition:.3s;text-align:center
}
.scene:hover{transform:translateY(-4px);border-color:var(--line-2);background:var(--panel-2)}
.scene-ic{font-size:2rem;margin-bottom:.7rem}
.scene h3{font-size:1.02rem;font-weight:700;margin-bottom:.4rem}
.scene p{font-size:.85rem;color:var(--text-2)}

/* ---------- 数据条 ---------- */
.metrics{padding:3rem 0;background:linear-gradient(90deg,rgba(33,199,255,.06),rgba(46,107,255,.06));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.metrics-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;text-align:center}
.metric b{display:block;font-size:clamp(1.9rem,3.6vw,2.7rem);font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.metric span{font-size:.85rem;color:var(--text-2)}

/* ---------- 定价 ---------- */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem;align-items:start}
.plan{
  position:relative;padding:1.9rem;border-radius:22px;background:var(--panel);
  border:1px solid var(--line);transition:.3s
}
.plan:hover{transform:translateY(-4px);border-color:var(--line-2)}
.plan-hot{
  background:linear-gradient(180deg,rgba(33,199,255,.1),rgba(46,107,255,.06));
  border-color:rgba(33,199,255,.4);box-shadow:0 20px 60px rgba(33,199,255,.12)
}
.hot-tag{
  position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--grad);color:#04101f;font-size:.72rem;font-weight:700;
  padding:.26rem .9rem;border-radius:999px;white-space:nowrap
}
.plan-h h3{font-size:1.2rem;font-weight:800}
.plan-h p{font-size:.82rem;color:var(--muted);margin:.25rem 0 1rem}
.price{font-size:2.4rem;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.price em{font-size:1.1rem;font-style:normal;color:var(--text-2);margin-right:.15rem}
.price small{font-size:.82rem;color:var(--muted);font-weight:500;margin-left:.25rem}
.plan ul{list-style:none;margin:1.3rem 0 1.6rem;display:flex;flex-direction:column;gap:.6rem}
.plan li{font-size:.88rem;color:var(--text-2);padding-left:1.35rem;position:relative}
.plan li::before{content:'✓';position:absolute;left:0;color:var(--cyan);font-weight:700}
.plan-note{text-align:center;color:var(--muted);font-size:.85rem;margin-top:1.8rem}

/* ---------- 关于 / 联系 ---------- */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:start}
.about-p{color:var(--text-2);margin:1rem 0}
.about-points{display:flex;flex-direction:column;gap:.7rem;margin-top:1.5rem}
.about-points div{
  display:flex;align-items:center;gap:.7rem;padding:.7rem 1rem;border-radius:12px;
  background:var(--panel);border:1px solid var(--line);font-size:.9rem
}
.about-points span{
  font-size:.72rem;font-weight:800;color:var(--cyan);
  border:1px solid rgba(33,199,255,.3);border-radius:6px;padding:.1rem .38rem
}
.contact-card{
  padding:2rem;border-radius:22px;
  background:linear-gradient(180deg,rgba(33,199,255,.09),rgba(46,107,255,.05));
  border:1px solid rgba(33,199,255,.28);box-shadow:var(--shadow)
}
.contact-card h3{font-size:1.25rem;font-weight:800}
.contact-card>p{color:var(--text-2);font-size:.88rem;margin:.5rem 0 1.4rem}
.contact-form{display:flex;flex-direction:column;gap:.75rem}
.contact-form input,.contact-form textarea{
  width:100%;padding:.78rem 1rem;border-radius:12px;font-size:.9rem;font-family:inherit;
  background:rgba(4,8,18,.6);border:1px solid var(--line);color:var(--text);transition:.2s
}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:#5d7099}
.contact-form input:focus,.contact-form textarea:focus{outline:none;border-color:var(--cyan);box-shadow:0 0 0 3px rgba(33,199,255,.14)}
.contact-form textarea{resize:vertical}
.form-tip{font-size:.8rem;min-height:1.2em;color:var(--cyan-l)}
.contact-alt{margin-top:1.2rem;padding-top:1.1rem;border-top:1px solid var(--line);font-size:.84rem;color:var(--muted);display:flex;justify-content:space-between;flex-wrap:wrap;gap:.4rem}
.contact-alt a{color:var(--cyan-l)}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--line);padding:3.2rem 0 1.5rem;background:rgba(4,7,15,.6)}
.footer-inner{display:grid;grid-template-columns:1.4fr 2fr;gap:2.5rem}
.footer-brand img{height:44px;margin-bottom:.9rem}
.footer-brand p{color:var(--muted);font-size:.85rem;max-width:22rem}
.footer-cols{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem}
.footer-cols h5{font-size:.85rem;font-weight:700;margin-bottom:.8rem}
.footer-cols a{display:block;font-size:.83rem;color:var(--muted);margin-bottom:.45rem;transition:.2s}
.footer-cols a:hover{color:var(--cyan-l)}
.footer-bottom{margin-top:2.5rem;padding-top:1.2rem;border-top:1px solid var(--line)}
.footer-bottom .container{display:flex;justify-content:space-between;gap:1rem;font-size:.78rem;color:#5c6f96;flex-wrap:wrap}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:2.5rem}
  .hero-screen{order:-1}
  .cards,.plans{grid-template-columns:repeat(2,1fr)}
  .scenes{grid-template-columns:repeat(2,1fr)}
  .channel-grid,.pipe-grid{grid-template-columns:repeat(2,1fr)}
  .channel-note{grid-template-columns:1fr}
  .ext-box{grid-template-columns:1fr}
  .ext-r{justify-content:flex-start}
  .about-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
}
@media (max-width:768px){
  .nav-links,.nav-actions .btn-ghost{display:none}
  .nav-toggle{display:flex}
  .nav.open .nav-links{
    display:flex;flex-direction:column;gap:1rem;position:absolute;top:84px;left:0;right:0;
    padding:1.2rem 6vw;background:rgba(6,10,22,.96);border-bottom:1px solid var(--line);
    backdrop-filter:blur(18px)
  }
  .hero-stats{gap:1.4rem}
  .cards,.plans,.scenes,.metrics-inner{grid-template-columns:1fr}
  .screen-body{grid-template-columns:104px 1fr}
  .flow-arrow{display:none}
  .footer-cols{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
}