:root{
  --bg:#FFFFFF;            /* 主背景 - 白 */
  --surface:#F7F9FB;       /* 卡片背景 */
  --text:#0E2433;          /* 深文本色 */
  --muted:#6B7A86;         /* 次要文本 */
  --primary:#0B61D8;       /* 德国常用偏稳重蓝色 */
  --accent:#E50914;        /* 点缀色（可选） */
  --radius:10px;
}

*{box-sizing:border-box}
body{font-family:Inter,system-ui,Segoe UI,Roboto,"Helvetica Neue",Arial,sans-serif;margin:0;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
.container{max-width:1100px;margin:0 auto;padding:24px}
.site-header{border-bottom:1px solid #E6EEF7;background:linear-gradient(180deg,rgba(11,97,216,0.04),transparent)}
.site-header .container{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.brand{font-weight:700;color:var(--primary);font-size:20px}
.nav{display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:flex-end}
.nav a{margin:0;color:var(--text);text-decoration:none;font-weight:600}

.hero{display:flex;gap:24px;align-items:center;padding:48px 0}
.hero-left{flex:1;min-width:260px}
.hero h1{font-size:36px;margin:0 0 12px;line-height:1.1}
.hero p{color:var(--muted);margin:0 0 18px;max-width:620px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.cta-row .btn{margin:0}

.hero-right{width:360px;max-width:100%}
.card{background:var(--surface);padding:18px;border-radius:var(--radius);box-shadow:0 6px 18px rgba(15,32,48,0.06)}
.card h3{margin:0 0 12px}
.entry-list{list-style:none;padding:0;margin:0}
.entry{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;padding:10px 8px;border-bottom:1px solid #E8F0F7}
.entry:last-child{border-bottom:0}
.latency{font-weight:600;color:var(--muted);margin-right:12px;flex:1;min-width:120px}
.open{background:transparent;border:1px solid var(--primary);color:var(--primary);padding:6px 10px;border-radius:6px;cursor:pointer}

.product{padding:32px 0}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px}
.feature{background:#fff;border-radius:8px;padding:18px;border:1px solid #EFF6FB}
.feature h4{margin:0 0 8px}
.feature p{margin:0;color:var(--muted)}

.insight-section{padding:40px 0}
.section-header{max-width:680px;margin:0 auto 28px;text-align:center}
.section-header h2{margin:0 0 12px;font-size:32px}
.section-header p{margin:0;color:var(--muted);line-height:1.75}
.insight-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:18px}
.insight-card{background:linear-gradient(180deg,#ffffff,#f7fbff);border:1px solid #E8F2FD;border-radius:16px;padding:24px;box-shadow:0 20px 40px rgba(15,32,48,0.06);min-height:220px;display:flex;flex-direction:column;gap:14px}
.insight-icon{width:48px;height:48px;border-radius:14px;background:rgba(11,97,216,0.12);display:flex;align-items:center;justify-content:center;font-size:24px}
.insight-card h3{margin:0;font-size:19px}
.insight-card p{margin:0;color:var(--muted);line-height:1.75;flex:1}

.contact{padding:32px 0}
.contact-form{display:grid;gap:12px;max-width:640px}
.contact-form label{display:flex;flex-direction:column;font-weight:600}
.contact-form input,.contact-form textarea{padding:10px;border-radius:8px;border:1px solid #DCECFB;margin-top:6px}
.form-actions{display:flex;gap:12px}
.form-note{color:var(--muted);font-size:13px}

.btn{display:inline-block;padding:10px 16px;border-radius:8px;text-decoration:none;font-weight:600}
.btn.primary{background:var(--primary);color:white}
.btn.ghost{background:transparent;border:1px solid #E2EEF9;color:var(--primary)}

.support-button{position:fixed;top:50%;right:18px;transform:translateY(-50%);width:56px;height:56px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 14px 30px rgba(11,97,216,0.18);text-decoration:none;z-index:20;border:2px solid rgba(255,255,255,0.3)}
.support-button:hover{background:#094bb8}
.support-button svg{width:24px;height:24px}

.carousel-section{background:#F4F8FF;padding:24px 0}
.carousel{position:relative;overflow:hidden;border-radius:22px;background:white;box-shadow:0 16px 36px rgba(15,32,48,0.08)}
.carousel-track{display:flex;transition:transform 0.45s ease;touch-action:pan-y;cursor:grab}
.carousel-track.grabbing{cursor:grabbing}
.carousel-slide{min-width:100%;position:relative;padding:0;overflow:hidden}
.carousel-slide::before{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,0.05),rgba(15,32,48,0.08));pointer-events:none}
.slide-text{position:absolute;left:24px;right:24px;bottom:24px;z-index:2;max-width:44%;padding:0;color:#fff;text-shadow:0 18px 30px rgba(0,0,0,0.35)}
.slide-badge{display:inline-flex;padding:8px 14px;border-radius:999px;background:rgba(255,255,255,0.14);color:#fff;font-weight:700;font-size:13px;margin-bottom:16px}
.carousel-slide h2{font-size:32px;margin:0 0 16px;line-height:1.05;color:#fff}
.carousel-slide p{margin:0;color:rgba(255,255,255,0.92);font-size:17px;line-height:1.85}
.slide-illustration{width:100%;height:420px;border-radius:10px;overflow:hidden;background:#f0f4fb;box-shadow:0 28px 60px rgba(11,97,216,0.12)}
.slide-illustration img{width:100%;height:100%;object-fit:cover;display:block}
.carousel-nav{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);display:flex;gap:12px}
.carousel-dot{width:12px;height:12px;border-radius:50%;border:none;background:rgba(14,36,51,0.16);cursor:pointer;transition:transform .2s ease,background .2s ease}
.carousel-dot.active{background:var(--primary);transform:scale(1.15)}

@media (max-width:860px){
  .carousel-slide{padding:0}
  .slide-text{position:absolute;left:16px;right:16px;bottom:16px;max-width:none;padding:0}
  .slide-illustration{width:100%;height:260px}
}

@media (max-width:560px){
  .carousel-section{padding:16px 0}
  .slide-text{left:12px;right:12px;bottom:12px;padding:16px}
  .carousel-slide h2{font-size:24px}
  .slide-illustration{height:220px}
}

.site-footer{padding:18px 0;border-top:1px solid #EEF6FB;color:var(--muted)}

/* 响应式 */
@media (max-width:900px){
  .hero{flex-direction:column;align-items:flex-start;padding:32px 0}
  .hero-right{width:100%}
  .site-header .container{padding:12px}
  .nav{justify-content:flex-start}
}

@media (max-width:700px){
  .container{padding:18px}
  .hero h1{font-size:32px}
  .hero p{font-size:15px}
  .hero-right{margin-top:16px}
  .cta-row{width:100%}
  .cta-row .btn{flex:1;min-width:140px;text-align:center}
  .entry{gap:10px}
  .form-actions{flex-direction:column}
  .form-actions .btn{width:100%}
}

@media (max-width:520px){
  .brand{font-size:18px}
  .nav{gap:10px}
  .nav a{padding:8px 0}
  .hero h1{font-size:28px}
  .hero p{font-size:14px}
  .feature-grid{grid-template-columns:1fr}
  .contact-form{max-width:100%}
  .container{padding:14px}
}