/* AI魔手 官网 · 深色科技风(独立,不引 admin.css) */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --cyan:#00f0ff; --purple:#b84dff; --green:#3dffb4;
  --bg:#070b14; --bg2:#0b1120; --card:rgba(255,255,255,.035);
  --border:rgba(255,255,255,.09); --border2:rgba(0,240,255,.22);
  --text:#e7ecf5; --text-sec:#9aa7bd; --text-mut:rgba(255,255,255,.4);
  --grad:linear-gradient(135deg,#00f0ff,#b84dff);
  --maxw:1160px;
}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg); color:var(--text); line-height:1.6; overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* 背景光斑 */
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(700px 500px at 12% -5%, rgba(0,240,255,.12), transparent 60%),
    radial-gradient(700px 500px at 92% 8%, rgba(184,77,255,.13), transparent 60%),
    radial-gradient(900px 600px at 50% 110%, rgba(61,255,180,.06), transparent 60%);
}

/* 顶栏 */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);
  background:rgba(7,11,20,.72);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;gap:20px;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.18rem;letter-spacing:.02em}
.brand svg{width:34px;height:34px}
.brand b{color:var(--cyan)}
.nav-links{display:flex;gap:26px;margin-left:14px;font-size:.9rem;color:var(--text-sec)}
.nav-links a:hover{color:var(--text)}
.nav-cta{margin-left:auto;display:flex;align-items:center;gap:10px}
.btn{display:inline-flex;align-items:center;gap:7px;padding:9px 20px;border-radius:10px;font-size:.88rem;font-weight:600;
  border:1px solid var(--border2);color:var(--cyan);background:rgba(0,240,255,.06);cursor:pointer;transition:.22s;white-space:nowrap}
.btn:hover{background:rgba(0,240,255,.14);transform:translateY(-1px)}
.btn.ghost{border-color:var(--border);color:var(--text-sec);background:transparent}
.btn.ghost:hover{color:var(--text);border-color:var(--border2)}
.btn.primary{background:var(--grad);color:#071018;border:none;box-shadow:0 6px 24px rgba(0,240,255,.22)}
.btn.primary:hover{filter:brightness(1.08);box-shadow:0 10px 34px rgba(0,240,255,.34)}
.btn.lg{padding:14px 30px;font-size:1rem}

/* Hero */
.hero{padding:88px 0 72px;text-align:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:6px 16px;border:1px solid var(--border2);border-radius:99px;
  font-size:.78rem;color:var(--cyan);background:rgba(0,240,255,.05);margin-bottom:26px}
.pill i{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green)}
.hero h1{font-size:clamp(2.2rem,5.2vw,3.9rem);font-weight:800;line-height:1.12;letter-spacing:-.01em}
.hero p.sub{max-width:720px;margin:22px auto 0;font-size:clamp(1rem,2vw,1.2rem);color:var(--text-sec)}
.hero-cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:38px}
.hero-note{margin-top:16px;font-size:.8rem;color:var(--text-mut)}

/* 闭环流水线 */
.section{padding:76px 0}
.section h2{font-size:clamp(1.6rem,3.4vw,2.4rem);font-weight:800;text-align:center;letter-spacing:-.01em}
.section .lead{max-width:640px;margin:14px auto 0;text-align:center;color:var(--text-sec)}
.flow{display:flex;align-items:stretch;gap:0;margin-top:52px;flex-wrap:wrap;justify-content:center}
.flow-step{flex:1;min-width:150px;max-width:210px;text-align:center;position:relative;padding:0 6px}
.flow-step .dot{width:56px;height:56px;margin:0 auto 16px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  font-size:1.5rem;background:var(--card);border:1px solid var(--border2);box-shadow:0 8px 30px rgba(0,240,255,.1)}
.flow-step h4{font-size:1.02rem;font-weight:700}
.flow-step p{font-size:.82rem;color:var(--text-sec);margin-top:6px}
.flow-step:not(:last-child)::after{content:"→";position:absolute;top:18px;right:-8px;color:var(--border2);font-size:1.3rem}
@media(max-width:760px){.flow-step:not(:last-child)::after{content:"↓";top:auto;bottom:-10px;right:auto;left:50%;transform:translateX(-50%)}
  .flow{flex-direction:column;align-items:center;gap:28px}.flow-step{max-width:280px}}

/* 产品矩阵 / 特性卡 */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-top:52px}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:26px 24px;transition:.24s}
.card:hover{border-color:var(--border2);transform:translateY(-4px);background:rgba(255,255,255,.055)}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;
  background:rgba(0,240,255,.08);border:1px solid var(--border2);margin-bottom:16px}
.card h3{font-size:1.12rem;font-weight:700}
.card p{color:var(--text-sec);font-size:.9rem;margin-top:8px}
.card .tag{display:inline-block;margin-top:12px;font-size:.72rem;color:var(--cyan);opacity:.85}

.feat{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin-top:48px}
.feat-item{display:flex;gap:14px;padding:18px 18px;border-radius:14px;border:1px solid var(--border);background:var(--card)}
.feat-item .fi{font-size:1.4rem;flex:0 0 auto}
.feat-item h4{font-size:.98rem;font-weight:700}
.feat-item p{font-size:.82rem;color:var(--text-sec);margin-top:3px}

/* 上手三步 */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-top:46px}
.step{position:relative;padding:26px 22px 22px;border:1px solid var(--border);border-radius:16px;background:var(--card)}
.step .n{position:absolute;top:-16px;left:22px;width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  font-weight:800;background:var(--grad);color:#071018}
.step h4{margin-top:8px;font-size:1.05rem;font-weight:700}
.step p{color:var(--text-sec);font-size:.88rem;margin-top:8px}

/* CTA 区 */
.cta-band{margin:20px auto 0;max-width:var(--maxw);text-align:center;padding:56px 28px;border-radius:24px;
  border:1px solid var(--border2);background:
    radial-gradient(600px 300px at 50% -20%, rgba(0,240,255,.15), transparent 65%), var(--bg2)}
.cta-band h2{font-size:clamp(1.5rem,3vw,2.1rem)}
.cta-band p{color:var(--text-sec);margin-top:12px}
.cta-band .hero-cta{margin-top:28px}

/* 页脚 */
.foot{border-top:1px solid var(--border);margin-top:56px;padding:36px 0 44px;color:var(--text-mut);font-size:.84rem}
.foot-in{display:flex;flex-wrap:wrap;gap:16px 30px;align-items:center;justify-content:space-between}
.foot a:hover{color:var(--text-sec)}
.foot .fbrand{display:flex;align-items:center;gap:8px;color:var(--text-sec)}
.foot .fbrand svg{width:26px;height:26px}
.foot .flinks{display:flex;gap:20px;flex-wrap:wrap}