/* ============================================================
   site18 — 科技感风格（深蓝底 + 霓虹青紫 · 模块化框架）
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Consolas",monospace,"Helvetica Neue",Arial,sans-serif;background:#0a0f1e;color:#dbe4f3;line-height:1.8}
img{max-width:100%;display:block;border-radius:12px}
a{text-decoration:none;color:inherit}
.wrap{width:min(1120px,92%);margin:0 auto}
.narrow{width:min(760px,92%)}
.section{padding:70px 0}
.section.alt{background:#0c1326}
.kicker{font-family:Consolas,monospace;font-size:12px;letter-spacing:.24em;color:#22d3ee;margin-bottom:10px}
.section h2{font-size:30px;margin-bottom:16px;color:#f1f5fd}
.note{font-size:13px;color:#7487ab}

/* 年龄提示条 */
.age-bar{position:sticky;top:0;z-index:60;display:flex;gap:14px;align-items:center;justify-content:center;flex-wrap:wrap;background:#060b18;border-bottom:1px solid #17233d;color:#c7d4ee;font-size:13px;padding:9px 14px;text-align:center}
.age-bar button{border:1px solid #22d3ee;background:transparent;color:#22d3ee;font-size:13px;padding:5px 16px;border-radius:6px;cursor:pointer}
.age-bar button:hover{background:#22d3ee;color:#06121f}

/* 头部导航 */
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,15,30,.92);backdrop-filter:blur(8px);border-bottom:1px solid #17233d}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 0}
.brand{display:flex;align-items:baseline;gap:10px}
.brand b{font-size:22px;color:#fff;text-shadow:0 0 18px rgba(34,211,238,.55)}
.brand span{font-size:12px;color:#7487ab;display:flex;flex-direction:column;line-height:1.25}
.brand small{font-family:Consolas,monospace;font-size:10px;letter-spacing:.24em;color:#a78bfa}
.menu-toggle{display:none;background:none;border:1px solid #24365c;border-radius:8px;font-size:18px;padding:4px 10px;cursor:pointer;color:#c7d4ee}
.site-header nav{display:flex;gap:18px;font-size:14px}
.site-header nav a{color:#9fb3d9;padding:6px 2px;border-bottom:2px solid transparent}
.site-header nav a:hover{color:#22d3ee;border-color:#22d3ee;text-shadow:0 0 12px rgba(34,211,238,.6)}

/* 面包屑 */
.breadcrumb{padding:16px 0 0;font-size:13px;color:#7487ab;display:flex;gap:8px;font-family:Consolas,monospace}
.breadcrumb a:hover{color:#22d3ee}

/* Hero */
.hero{padding:84px 0 70px;background:radial-gradient(900px 380px at 50% -8%,rgba(34,211,238,.14),transparent),radial-gradient(700px 300px at 85% 110%,rgba(167,139,250,.1),transparent)}
.hero h1{font-size:42px;line-height:1.25;color:#fff;margin:8px 0 14px}
.hero h1 em{font-style:normal;color:#22d3ee;text-shadow:0 0 26px rgba(34,211,238,.65)}
.glow-sub{font-size:16px;color:#b9c8e6;max-width:680px}
.sys-note{font-family:Consolas,monospace;font-size:13px;color:#7fe3c3;margin-top:12px}
.hero-actions{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 28px;border-radius:8px;font-size:14px;transition:.25s;border:1px solid transparent;cursor:pointer}
.btn.primary{background:linear-gradient(92deg,#22d3ee,#a78bfa);color:#06121f;font-weight:700}
.btn.primary:hover{filter:brightness(1.12);box-shadow:0 0 26px -6px rgba(34,211,238,.7)}
.btn.ghost{border-color:#2a3b60;color:#c8d6ef}
.btn.ghost:hover{border-color:#a78bfa;color:#cdbdff}

/* 跑马灯 */
.marquee{overflow:hidden;border-top:1px solid #17233d;border-bottom:1px solid #17233d;background:#070c17;padding:12px 0}
.marquee-inner{display:inline-flex;gap:38px;white-space:nowrap;animation:mq 18s linear infinite;font-family:Consolas,monospace;font-size:13px;color:#5f739c}
@keyframes mq{to{transform:translateX(-50%)}}

/* 产品模块：角标卡 */
.mods{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px}
.mod{position:relative;background:#0e1628;border:1px solid #1d2b47;border-radius:12px;padding:26px;transition:.3s}
.mod::before,.mod::after{content:"";position:absolute;width:18px;height:18px;transition:.3s}
.mod::before{top:-1px;left:-1px;border-top:2px solid #22d3ee;border-left:2px solid #22d3ee}
.mod::after{bottom:-1px;right:-1px;border-bottom:2px solid #a78bfa;border-right:2px solid #a78bfa}
.mod:hover{transform:translateY(-4px);border-color:#2a3b60;box-shadow:0 22px 50px -28px rgba(34,211,238,.4)}
.mod h3{font-size:17px;color:#9be7f6;margin-bottom:10px}
.mod p{font-size:14px;color:#93a5c9}
.specs{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.specs span{font-family:Consolas,monospace;font-size:12px;border:1px solid #24365c;border-radius:6px;padding:4px 10px;color:#8fa5cf}

/* 关于 */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.sys-list{list-style:none;margin-top:8px}
.sys-list li{font-size:14px;color:#aebddc;padding:10px 0 10px 26px;position:relative;border-bottom:1px dashed #1c2a48}
.sys-list li::before{content:"▸";position:absolute;left:4px;color:#22d3ee}
.sys-list b{color:#e4ecfa}

/* 用户日志控制台 */
.console{background:#070c17;border:1px solid #1d2b47;border-radius:12px;padding:24px;margin-top:14px;font-family:Consolas,monospace;font-size:13.5px}
.console .line{margin-bottom:10px;color:#aebddc}
.console .pfx{color:#22d3ee;font-weight:700}

/* FAQ */
.faq-item{background:#0e1628;border:1px solid #1d2b47;border-radius:10px;padding:16px 20px;margin-bottom:12px;cursor:pointer}
.faq-item h3{font-size:15px;color:#e4ecfa;display:flex;justify-content:space-between;align-items:center}
.faq-item h3::after{content:"+";color:#22d3ee;font-family:Consolas,monospace;font-weight:700}
.faq-item p{font-size:14px;color:#93a5c9;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s}
.faq-item.open p{max-height:220px;padding-top:10px}
.faq-item.open h3::after{content:"−"}

/* 联系 */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.contact-form{background:#0e1628;border:1px solid #1d2b47;border-radius:14px;padding:26px;display:grid;gap:14px}
.contact-form label{font-size:13px;color:#9fb3d9;display:grid;gap:6px}
.contact-form input,.contact-form textarea{border:1px solid #24365c;background:#0a1120;border-radius:8px;padding:11px 12px;font-size:14px;font-family:inherit;color:#e4ecfa;outline:none;resize:vertical}
.contact-form input:focus,.contact-form textarea:focus{border-color:#22d3ee;box-shadow:0 0 0 3px rgba(34,211,238,.15)}
.contact-form .err{border-color:#e15b7d!important}
.form-tip{font-size:13px;color:#7fe3c3}

/* 页脚 */
.site-footer{background:#060b18;border-top:1px solid #17233d;color:#6f81a6;padding:34px 0;font-size:13px;text-align:center}
.site-footer .legal{font-size:12px;color:#4d5d80;max-width:860px;margin:10px auto 0}

/* 响应式 */
@media (max-width:980px){
  .mods{grid-template-columns:repeat(2,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr}
}
@media (max-width:720px){
  .menu-toggle{display:block}
  .site-header nav{position:absolute;top:100%;left:0;right:0;background:#0a0f1e;flex-direction:column;gap:0;padding:8px 4%;border-bottom:1px solid #17233d;display:none}
  .site-header nav.open{display:flex}
  .site-header nav a{padding:12px 0;border-bottom:1px dashed #1c2a48}
  .mods{grid-template-columns:1fr}
  .section{padding:52px 0}
  .hero{padding:56px 0}
  .hero h1{font-size:28px}
}