@keyframes breathe {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.3; transform: scale(0.6); }
}
:root {
    --bg: #070b14;
    --bg2: #0b1120;
    --card: rgba(255,255,255,.03);
    --card-border: rgba(255,255,255,.07);
    --primary: #4f8ef7;
    --primary2: #6c5ce7;
    --text: #e8ecf4;
    --text2: #8892a6;
    --heading: #ffffff;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg); color: var(--text); line-height:1.7; overflow-x:hidden;
}
a { text-decoration:none; color:inherit; }

/* 粒子画布 */
#particles { position:fixed; inset:0; z-index:0; pointer-events:none; }

/* 容器 */
.container { max-width:1140px; margin:0 auto; padding:0 24px; position:relative; z-index:1; }

/* 导航 */
header {
    position:fixed; top:0; left:0; right:0; z-index:100;
    padding:20px 0; transition:all .3s;
    background: rgba(7,11,20,.7); backdrop-filter:blur(12px);
}
.nav-inner { display:flex; justify-content:space-between; align-items:center; }
.logo { display:flex; align-items:center; gap:10px; font-weight:700; font-size:17px; color:#fff; }
.logo .logo-icon {
    width:36px; height:36px; background:linear-gradient(135deg,#4f8ef7,#6c5ce7);
    border-radius:9px; display:flex; align-items:center; justify-content:center; font-size:16px;
}
.nav-links { display:flex; align-items:center; gap:32px; }
.nav-links a { font-size:14px; color:var(--text2); transition:color .2s; }
.nav-links a:hover { color:#fff; }
.nav-links a.cta {
    padding:7px 18px; border-radius:8px; color:#fff; font-size:13px;
    background:linear-gradient(135deg,#4f8ef7,#6c5ce7);
}
.nav-links a.cta:hover { color:#fff; opacity:.9; }

/* Hero */
.hero { padding:160px 0 80px; text-align:center; position:relative; }
.hero-badge {
    display:inline-flex; align-items:center; gap:6px; padding:6px 16px; border-radius:20px;
    background:rgba(79,142,247,.1); border:1px solid rgba(79,142,247,.25);
    font-size:13px; color:var(--primary); margin-bottom:28px;
}
.hero h1 {
    font-size:56px; line-height:1.2; font-weight:800; color:var(--heading);
    margin-bottom:24px; letter-spacing:-1px;
}
.hero h1 .hl { color:var(--primary); }
.hero-desc { max-width:620px; margin:0 auto 36px; color:var(--text2); font-size:16px; }
.hero-btns { display:flex; gap:14px; justify-content:center; margin-bottom:60px; }
.btn {
    padding:13px 28px; border-radius:10px; font-size:14px; font-weight:600;
    display:inline-flex; align-items:center; gap:8px; transition:all .2s; cursor:pointer; border:none;
}
.btn-primary { background:linear-gradient(135deg,#4f8ef7,#6c5ce7); color:#fff; }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 24px rgba(79,142,247,.4); }
.btn-outline { background:transparent; border:1px solid rgba(255,255,255,.15); color:var(--text); }
.btn-outline:hover { border-color:rgba(255,255,255,.35); }
.hero-stats { display:flex; justify-content:center; gap:60px; }
.stat-item .num { font-size:32px; font-weight:800; color:#4fc3f7; }
.stat-item .label { font-size:13px; color:var(--text2); }

/* Section 通用 */
section { padding:100px 0; position:relative; }
.sec-badge {
    display:block; text-align:center; font-size:13px; color:var(--primary);
    margin-bottom:14px; font-weight:600;
}
.sec-title { text-align:center; font-size:38px; font-weight:800; color:#fff; margin-bottom:16px; }
.sec-desc { text-align:center; color:var(--text2); max-width:560px; margin:0 auto 56px; font-size:14px; }

/* 服务卡片 */
.services-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.svc-card {
    background:var(--card); border:1px solid var(--card-border); border-radius:16px;
    padding:32px; transition:all .3s;
}
.svc-card:hover { border-color:rgba(79,142,247,.4); transform:translateY(-4px); background:rgba(79,142,247,.04); }
.svc-icon {
    width:48px; height:48px; border-radius:12px; display:flex; align-items:center; justify-content:center;
    font-size:20px; margin-bottom:20px;
}
.svc-card h3 { font-size:18px; color:#fff; margin-bottom:10px; }
.svc-card p { font-size:14px; color:var(--text2); margin-bottom:16px; }
.svc-link { font-size:13px; color:var(--primary); font-weight:600; }

/* 关于 */
.about-wrap { display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:center; }
.about-badge { font-size:13px; color:var(--primary); font-weight:600; margin-bottom:12px; }
.about-wrap h2 { font-size:36px; color:#fff; font-weight:800; line-height:1.3; margin-bottom:20px; }
.about-wrap p { color:var(--text2); font-size:14px; margin-bottom:16px; }
.feature-tags { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin-top:24px; }
.feat-tag {
    display:flex; align-items:center; gap:10px; padding:12px 16px;
    background:var(--card); border:1px solid var(--card-border); border-radius:10px; font-size:14px;
}
.feat-tag i { color:var(--primary); }
.about-panel {
    background:var(--card); border:1px solid var(--card-border); border-radius:16px; padding:32px;
}
.tech-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; margin-bottom:28px; }
.tech-item {
    background:rgba(255,255,255,.03); border-radius:12px; padding:20px 10px; text-align:center;
}
.tech-item i { font-size:24px; color:var(--primary); margin-bottom:8px; display:block; }
.tech-item span { font-size:13px; color:var(--text2); }
.mile-row { margin-bottom:18px; }
.mile-label { display:flex; justify-content:space-between; font-size:13px; color:var(--text2); margin-bottom:8px; }
.mile-bar { height:6px; background:rgba(255,255,255,.06); border-radius:3px; overflow:hidden; }
.mile-fill { height:100%; background:linear-gradient(90deg,#4f8ef7,#6c5ce7); border-radius:3px; }

/* 联系 */
.contact-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
.contact-card {
    background:var(--card); border:1px solid var(--card-border); border-radius:16px;
    padding:36px 24px; text-align:center; transition:all .3s;
}
.contact-card:hover { border-color:rgba(79,142,247,.35); }
.contact-card .c-icon {
    width:52px; height:52px; border-radius:50%; background:rgba(79,142,247,.12);
    display:flex; align-items:center; justify-content:center; margin:0 auto 16px; font-size:20px; color:var(--primary);
}
.contact-card h4 { font-size:16px; color:#fff; margin-bottom:8px; }
.contact-card p { font-size:14px; color:var(--text2); }

/* 页脚 */
footer { background:var(--bg2); border-top:1px solid var(--card-border); padding:60px 0 0; margin-top:40px; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1.5fr; gap:40px; padding-bottom:40px; }
.footer-brand .logo { margin-bottom:16px; }
.footer-brand p { font-size:13px; color:var(--text2); }
.footer-col h5 { font-size:14px; color:#fff; margin-bottom:18px; }
.footer-col a { display:block; font-size:13px; color:var(--text2); margin-bottom:10px; transition:color .2s; }
.footer-col a:hover { color:var(--primary); }
.footer-contact p { font-size:13px; color:var(--text2); margin-bottom:10px; display:flex; align-items:center; gap:8px; }
.footer-contact i { color:var(--primary); width:16px; }
.footer-bottom {
    border-top:1px solid var(--card-border); padding:20px 0; display:flex; justify-content:space-between;
    font-size:12px; color:var(--text2);
}

/* 返回顶部 */
.back-top {
    position:fixed; bottom:30px; right:30px; width:42px; height:42px; border-radius:50%;
    background:var(--primary); color:#fff; display:flex; align-items:center; justify-content:center;
    cursor:pointer; z-index:50; opacity:0; transition:opacity .3s; border:none;
}
.back-top.show { opacity:1; }

/* AI客服弹窗 */
#chatOverlay { position:fixed; inset:0; background:rgba(0,0,0,.5); z-index:200; opacity:0; visibility:hidden; transition:all .3s; }
#chatOverlay.open { opacity:1; visibility:visible; }
#chatBox { position:fixed; bottom:30px; right:30px; width:380px; height:520px; background:#0d1425; border:1px solid rgba(255,255,255,.1); border-radius:16px; z-index:201; display:flex; flex-direction:column; overflow:hidden; transform:translateY(20px) scale(.95); opacity:0; visibility:hidden; transition:all .3s; }
#chatBox.open { transform:translateY(0) scale(1); opacity:1; visibility:visible; }
.chat-header { padding:16px 20px; background:rgba(79,142,247,.1); border-bottom:1px solid rgba(255,255,255,.08); display:flex; justify-content:space-between; align-items:center; }
.chat-header-info { display:flex; align-items:center; gap:12px; }
.chat-avatar { width:40px; height:40px; border-radius:50%; background:linear-gradient(135deg,#4f8ef7,#6c5ce7); display:flex; align-items:center; justify-content:center; color:#fff; font-size:18px; }
.chat-name { font-size:15px; font-weight:600; color:#fff; }
.chat-status { font-size:12px; color:#10b981; }
.chat-status .dot { display:inline-block; width:6px; height:6px; background:#10b981; border-radius:50%; margin-right:4px; }
.chat-close { background:none; border:none; color:#8892a6; font-size:18px; cursor:pointer; }
.chat-close:hover { color:#fff; }
.chat-msgs { flex:1; overflow-y:auto; padding:20px; display:flex; flex-direction:column; gap:16px; }
.msg { display:flex; gap:10px; }
.msg.user { flex-direction:row-reverse; }
.msg-avatar { width:32px; height:32px; border-radius:50%; flex-shrink:0; display:flex; align-items:center; justify-content:center; font-size:14px; background:rgba(79,142,247,.2); color:#4f8ef7; }
.msg.user .msg-avatar { background:rgba(255,255,255,.1); color:#8892a6; }
.msg-bubble { max-width:70%; padding:10px 14px; border-radius:12px; font-size:14px; line-height:1.5; }
.msg.bot .msg-bubble { background:rgba(255,255,255,.06); color:#e8ecf4; border-bottom-left-radius:4px; }
.msg.user .msg-bubble { background:linear-gradient(135deg,#4f8ef7,#6c5ce7); color:#fff; border-bottom-right-radius:4px; }
.chat-input { padding:12px 16px; border-top:1px solid rgba(255,255,255,.08); display:flex; gap:10px; }
.chat-input input { flex:1; padding:10px 14px; border-radius:10px; border:1px solid rgba(255,255,255,.1); background:rgba(255,255,255,.05); color:#fff; font-size:14px; outline:none; }
.chat-input input:focus { border-color:#4f8ef7; }
.chat-input button { width:42px; height:42px; border-radius:10px; border:none; background:linear-gradient(135deg,#4f8ef7,#6c5ce7); color:#fff; cursor:pointer; font-size:15px; }

@media (max-width: 900px) {
    .services-grid, .contact-grid { grid-template-columns:1fr; }
    .about-wrap { grid-template-columns:1fr; }
    .hero h1 { font-size:36px; }
    .footer-grid { grid-template-columns:1fr 1fr; }
    .nav-links a:not(.cta) { display:none; }
}