:root{
  --bg:#0b0f1a;
  --bg2:#0d1326;
  --panel:rgba(19,26,43,.55);
  --panel-solid:#131a2b;
  --line:rgba(108,140,255,.18);
  --txt:#e7ecf5;
  --muted:#8a97b3;
  --blue:#2de2c4;        /* 主强调：青绿（与 SibyX 一致）*/
  --blue2:#6c8cff;       /* 次强调：蓝 */
  --green:#6c8cff;
  --green2:#a5b4fc;
  --glow:0 0 24px rgba(45,226,196,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI",system-ui,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--txt);
  background:transparent;
  line-height:1.75;
  min-height:100vh;
}
/* 科技感背景由 css/tech-bg.css 的 .tech-bg 固定层提供（网格+双色光晕+节点网络），
   与 SibyX / AI Token 控制台同源。若放入真实科技感背景图，取消下一行注释并指向 img/hero-bg.jpg。 */
/* body{background-image:url('../img/hero-bg.jpg');background-size:cover;background-position:center;} */

a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 22px}

/* ===== Nav ===== */
nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 22px;
  background:rgba(11,15,26,.82);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brand{font-weight:800;font-size:1.25rem;letter-spacing:.5px;display:flex;align-items:center;gap:9px}
.brand-logo{width:32px;height:32px;flex:none}
.brand .dot{width:11px;height:11px;border-radius:50%;background:var(--blue);box-shadow:0 0 12px var(--blue)}
.brand span{color:var(--blue);font-weight:600;font-size:.95rem;opacity:.9}
.nav-links{display:flex;gap:26px;list-style:none}
.nav-links a{color:var(--muted);font-size:.96rem;transition:.2s;position:relative;padding:4px 0}
.nav-links a:hover{color:var(--txt)}
.nav-links a.active{color:var(--blue)}
.nav-links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background:var(--blue);box-shadow:var(--glow)}
.lang-toggle{
  background:transparent;border:1px solid var(--line);color:var(--blue);
  padding:7px 14px;border-radius:8px;cursor:pointer;font-weight:600;transition:.2s
}
.lang-toggle:hover{background:rgba(45,226,196,.12);box-shadow:var(--glow)}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;padding:96px 0 76px;text-align:center}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:
    radial-gradient(circle at 50% -10%, rgba(45,226,196,.20), transparent 55%),
    radial-gradient(circle at 90% 20%, rgba(108,140,255,.14), transparent 40%);
  pointer-events:none;
}
.hero .net{position:absolute;inset:0;width:100%;height:100%;opacity:.5;pointer-events:none}
.hero-inner{position:relative;z-index:2}
.hero h1{font-size:clamp(2rem,5vw,3.4rem);line-height:1.2;font-weight:800;margin-bottom:18px}
.hero h1 .accent{color:var(--blue);text-shadow:var(--glow)}
.hero p.lead{font-size:clamp(1.05rem,2.2vw,1.3rem);color:var(--muted);max-width:760px;margin:0 auto 30px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;max-width:880px;margin:40px auto 0}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:20px 14px;backdrop-filter:blur(6px)}
.stat b{display:block;font-size:1.7rem;color:var(--blue2);text-shadow:var(--glow)}
.stat span{font-size:.85rem;color:var(--muted)}

/* ===== Sections ===== */
section.block{padding:72px 0}
.sec-head{text-align:center;margin-bottom:42px}
.sec-head h2{font-size:clamp(1.6rem,3.5vw,2.3rem);font-weight:800}
.sec-head h2 .accent{color:var(--blue)}
.sec-head p{color:var(--muted);margin-top:10px;max-width:640px;margin-left:auto;margin-right:auto}

.cards{display:grid;gap:22px}
.cards.c2{grid-template-columns:repeat(2,1fr)}
.cards.c3{grid-template-columns:repeat(3,1fr)}
.cards.c4{grid-template-columns:repeat(4,1fr)}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:28px;backdrop-filter:blur(6px);transition:.25s;position:relative;overflow:hidden
}
.card:hover{transform:translateY(-5px);border-color:rgba(45,226,196,.5);box-shadow:var(--glow)}
.card .ic{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,rgba(45,226,196,.25),rgba(108,140,255,.18));margin-bottom:16px;font-size:1.5rem}
.card h3{font-size:1.2rem;margin-bottom:10px}
.card p{color:var(--muted);font-size:.96rem}
.card .tag{display:inline-block;margin-top:14px;font-size:.8rem;color:var(--blue);border:1px solid var(--line);padding:3px 10px;border-radius:20px}

/* intro split */
.split{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.split .txt h2{font-size:clamp(1.5rem,3vw,2.1rem);margin-bottom:16px}
.split .txt p{color:var(--muted);margin-bottom:14px}
.split .visual{
  background:var(--panel-solid);border:1px solid var(--line);border-radius:18px;padding:26px;
  position:relative;overflow:hidden
}
.split .visual .row{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px dashed var(--line);font-size:.95rem}
.split .visual .row:last-child{border-bottom:none}
.split .visual .row b{color:var(--green2)}

/* pricing */
.plan{display:flex;flex-direction:column}
.plan.featured{border-color:var(--blue);box-shadow:var(--glow)}
.plan .price{font-size:2rem;color:var(--blue2);font-weight:800;margin:8px 0}
.plan ul{list-style:none;margin:14px 0;color:var(--muted);font-size:.94rem}
.plan ul li{padding:6px 0;border-bottom:1px dashed var(--line)}
.plan ul li::before{content:"▹";color:var(--blue);margin-right:8px}

/* buttons */
.btn{
  display:inline-block;padding:13px 28px;border-radius:10px;font-weight:700;cursor:pointer;
  background:linear-gradient(135deg,var(--blue),var(--blue2));color:#06231f;border:none;
  box-shadow:var(--glow);transition:.2s;font-size:1rem
}
.btn:hover{transform:translateY(-2px);filter:brightness(1.08)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--txt);box-shadow:none}
.btn.ghost:hover{border-color:var(--blue);color:var(--blue)}
.center{text-align:center}
.cta-row{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-top:26px}

/* contact form */
.form{max-width:560px;margin:0 auto;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:30px;backdrop-filter:blur(6px)}
.form label{display:block;font-size:.9rem;color:var(--muted);margin:14px 0 6px}
.form input,.form textarea,.form select{
  width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--line);
  background:rgba(11,15,26,.6);color:var(--txt);font-size:.95rem;font-family:inherit
}
.form input:focus,.form textarea:focus,.form select:focus{outline:none;border-color:var(--blue);box-shadow:var(--glow)}
.form textarea{min-height:110px;resize:vertical}

/* footer */
footer{margin-top:40px;border-top:1px solid var(--line);padding:30px 0;text-align:center;color:var(--muted);font-size:.88rem}
footer .brand{justify-content:center;margin-bottom:10px}

/* hamburger (mobile only) */
.menu-toggle{display:none}
/* responsive */
@media(max-width:860px){
  .menu-toggle{
    display:block;margin-left:auto;
    background:transparent;border:1px solid var(--line);color:var(--txt);
    font-size:1.35rem;line-height:1;cursor:pointer;padding:6px 13px;border-radius:8px
  }
  .nav-links{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;gap:0;padding:0;
    background:rgba(11,15,26,.98);
    border-bottom:1px solid var(--line);
    max-height:0;overflow:hidden;transition:max-height .28s ease
  }
  .nav-links.open{max-height:440px}
  .nav-links li{width:100%;text-align:center;padding:0;border-top:1px solid var(--line)}
  .nav-links li a{display:block;padding:15px 0}
  .nav-links a.active::after{display:none}
  .stats{grid-template-columns:repeat(2,1fr)}
  .cards.c2,.cards.c3,.cards.c4{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .hero{padding:64px 0 50px}
  .stat b{font-size:1.45rem}
  .cta-row{flex-direction:column;align-items:stretch}
  .cta-row .btn{width:100%;text-align:center}
  section.block{padding:54px 0}
  .form{padding:22px}
  .plan .price{font-size:1.7rem}
}
@media(max-width:420px){
  .stats{grid-template-columns:repeat(2,1fr);gap:12px}
  .stat{padding:16px 8px}
  .stat b{font-size:1.2rem}
  .wrap{padding:0 16px}
}