/* ============================================================
   千机阵 · 下载站  style.css
   风格对齐 clbot.com.cn 官网（龙虾AI云工坊）：深蓝渐变 / 卡片 / 暗色 footer
   纯静态、零 JS 依赖
   ============================================================ */

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:#1e293b;background:#fff;line-height:1.6;overflow-x:hidden
}
a{text-decoration:none;color:inherit}

/* ---------- 顶部导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:72px;display:flex;align-items:center;justify-content:space-between;
  padding:0 48px;background:rgba(255,255,255,0.9);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(0,0,0,0.06)
}
.nav .logo{font-size:20px;font-weight:800;letter-spacing:-0.5px}
.nav .logo span{color:#2563eb}
.nav-links{display:flex;align-items:center;gap:28px;list-style:none}
.nav-links a{font-size:14px;font-weight:500;color:#64748b;transition:color .2s}
.nav-links a:hover{color:#2563eb}
.nav-links .nav-back{color:#2563eb;font-weight:600}
.nav-links .nav-back:hover{color:#1d4ed8}

/* ---------- Hero ---------- */
.hero{
  margin-top:72px;padding:120px 48px 100px;
  background:linear-gradient(135deg,#0f172a 0%,#1e3a5f 50%,#2563eb 100%);
  text-align:center;position:relative;overflow:hidden
}
.hero::before{
  content:'';position:absolute;top:-60%;left:-20%;width:140%;height:200%;
  background:radial-gradient(ellipse at 30% 50%,rgba(59,130,246,0.12) 0%,transparent 60%),
             radial-gradient(ellipse at 70% 50%,rgba(99,102,241,0.08) 0%,transparent 60%);
  pointer-events:none
}
.hero-content{position:relative;z-index:1;max-width:680px;margin:0 auto}
.hero-badge{
  display:inline-block;padding:6px 20px;border-radius:20px;font-size:13px;font-weight:600;
  background:rgba(255,255,255,0.1);color:rgba(255,255,255,0.8);margin-bottom:24px;
  border:1px solid rgba(255,255,255,0.1)
}
.hero h1{font-size:52px;font-weight:800;color:#fff;margin-bottom:16px;letter-spacing:-1px;line-height:1.15}
.hero h1 span{background:linear-gradient(135deg,#60a5fa,#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero .subtitle{font-size:20px;color:rgba(255,255,255,0.85);font-weight:500;margin-bottom:12px}
.hero p{font-size:16px;color:rgba(255,255,255,0.65);max-width:560px;margin:0 auto 36px;line-height:1.7}
.hero-btns{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero-btn{
  padding:14px 36px;border-radius:10px;font-size:16px;font-weight:600;
  transition:all .25s;display:inline-flex;align-items:center;gap:8px
}
.hero-btn.primary{background:#2563eb;color:#fff;box-shadow:0 4px 20px rgba(37,99,235,0.35)}
.hero-btn.primary:hover{background:#1d4ed8;transform:translateY(-2px);box-shadow:0 6px 28px rgba(37,99,235,0.45)}
.hero-btn.secondary{background:rgba(255,255,255,0.08);color:#fff;border:1px solid rgba(255,255,255,0.15)}
.hero-btn.secondary:hover{background:rgba(255,255,255,0.15);transform:translateY(-2px)}

/* ---------- 通用 Section ---------- */
.section{padding:100px 48px}
.inner{max-width:1100px;margin:0 auto}
.section-title{text-align:center;font-size:32px;font-weight:800;color:#0f172a;margin-bottom:12px;letter-spacing:-0.5px}
.section-desc{text-align:center;font-size:16px;color:#64748b;max-width:640px;margin:0 auto 64px}

/* ---------- 功能亮点 ---------- */
.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-bottom:0}
.feat-card{
  background:#f8fafc;border-radius:14px;padding:28px 24px;
  border:1px solid #e2e8f0;transition:all .3s;text-align:center
}
.feat-card:hover{border-color:#bfdbfe;box-shadow:0 8px 32px rgba(37,99,235,0.06);transform:translateY(-2px)}
.feat-card .icon{font-size:36px;margin-bottom:14px}
.feat-card h3{font-size:16px;font-weight:700;color:#0f172a;margin-bottom:6px}
.feat-card p{font-size:14px;color:#64748b;line-height:1.6}

/* ---------- 产品卡片（凤凰台等） ---------- */
.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.card{
  background:#fff;border-radius:16px;padding:36px 32px;
  border:1px solid #e2e8f0;transition:all .3s;
  display:flex;flex-direction:column
}
.card:hover{border-color:#bfdbfe;box-shadow:0 8px 32px rgba(37,99,235,0.08);transform:translateY(-3px)}
.card .icon{font-size:40px;margin-bottom:20px}
.card .tag{
  display:inline-block;align-self:flex-start;padding:4px 12px;border-radius:6px;
  font-size:12px;font-weight:600;margin-bottom:12px
}
.card .tag.cloud{background:#e0e7ff;color:#3730a3}
.card .tag.op{background:#f1f5f9;color:#475569}
.card h3{font-size:18px;font-weight:700;color:#0f172a;margin-bottom:8px}
.card p{font-size:14px;color:#64748b;line-height:1.7;margin-bottom:24px;flex:1}
.card .btn{
  padding:10px 0;border-radius:8px;font-size:14px;font-weight:600;
  text-align:center;transition:all .2s;border:1px solid #e2e8f0;color:#1e293b
}
.card .btn:hover{background:#f8fafc;border-color:#2563eb;color:#2563eb}
.soon-badge{
  display:inline-block;align-self:flex-start;padding:6px 14px;border-radius:8px;
  font-size:13px;font-weight:600;color:#b45309;background:#fef3c7;border:1px solid #fde68a
}

/* ---------- 下载区 ---------- */
.download-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;max-width:820px;margin:0 auto}
.dl-card{
  background:#fff;border-radius:16px;padding:36px 32px;text-align:center;
  border:1px solid #e2e8f0;transition:all .3s;display:flex;flex-direction:column
}
.dl-card:hover{border-color:#bfdbfe;box-shadow:0 8px 32px rgba(37,99,235,0.08);transform:translateY(-3px)}
.dl-card .dl-icon{font-size:48px;margin-bottom:14px}
.dl-card h3{font-size:18px;font-weight:700;color:#0f172a;margin-bottom:8px}
.dl-card p{font-size:14px;color:#64748b;line-height:1.7;margin-bottom:24px;flex:1}
.dl-btn{
  display:block;padding:14px 0;border-radius:10px;font-size:16px;font-weight:600;
  background:#2563eb;color:#fff;transition:all .25s;box-shadow:0 4px 20px rgba(37,99,235,0.3)
}
.dl-btn:hover{background:#1d4ed8;transform:translateY(-2px);box-shadow:0 6px 28px rgba(37,99,235,0.4)}
.dl-note{text-align:center;font-size:13px;color:#94a3b8;margin-top:28px}

/* ---------- 扫码下载（二维码占位） ---------- */
.qr-block{text-align:center;margin-top:56px}
.qr-frame{
  width:180px;height:180px;margin:0 auto;border-radius:12px;overflow:hidden;
  border:1px solid #e2e8f0;background:#fff;position:relative
}
.qr-placeholder{
  width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;
  background:
    repeating-linear-gradient(0deg,rgba(37,99,235,0.10) 0 8px,transparent 8px 16px),
    repeating-linear-gradient(90deg,rgba(37,99,235,0.10) 0 8px,transparent 8px 16px),
    #f8fafc;
  border-radius:12px;padding:8px;text-align:center
}
.qr-placeholder .qr-mark{font-size:34px;color:#2563eb;opacity:.55;line-height:1}
.qr-placeholder .qr-hint{font-size:13px;font-weight:700;color:#1e293b}
.qr-placeholder .qr-token{font-size:10px;color:#94a3b8;word-break:break-all;max-width:90%}
.qr-img{width:100%;height:100%;display:block;border-radius:12px;object-fit:contain}
.qr-caption{font-size:14px;color:#64748b;margin-top:12px}

/* ---------- 激活说明 / 三步流程 ---------- */
.how-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;max-width:820px;margin:0 auto}
.how-step{text-align:center}
.how-step .num{
  width:48px;height:48px;border-radius:50%;background:#2563eb;color:#fff;
  font-size:20px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px
}
.how-step h3{font-size:16px;font-weight:700;color:#0f172a;margin-bottom:6px}
.how-step p{font-size:14px;color:#64748b;line-height:1.6}

.activate-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px;max-width:880px;margin:56px auto 0}
.info-card{
  background:#fff;border-radius:16px;padding:32px 28px;text-align:center;
  border:1px solid #e2e8f0;transition:all .3s
}
.info-card:hover{border-color:#bfdbfe;box-shadow:0 8px 32px rgba(37,99,235,0.06);transform:translateY(-2px)}
.info-card .info-icon{font-size:34px;margin-bottom:12px}
.info-card h3{font-size:16px;font-weight:700;color:#0f172a;margin-bottom:8px}
.info-card p{font-size:14px;color:#64748b;line-height:1.7;margin-bottom:18px}
.info-card b{color:#1e293b}
.how-cta-btn{
  display:inline-block;padding:12px 28px;border-radius:10px;font-size:14px;font-weight:600;
  background:#2563eb;color:#fff;transition:all .25s;box-shadow:0 4px 16px rgba(37,99,235,0.3)
}
.how-cta-btn:hover{background:#1d4ed8;transform:translateY(-2px);box-shadow:0 6px 24px rgba(37,99,235,0.4)}

/* ---------- 联系客服 ---------- */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px;max-width:960px;margin:0 auto}
.contact-card{
  background:#f8fafc;border-radius:16px;padding:32px 28px;text-align:center;
  border:1px solid #e2e8f0;transition:all .3s
}
.contact-card:hover{border-color:#bfdbfe;box-shadow:0 8px 32px rgba(37,99,235,0.06);transform:translateY(-2px)}
.contact-card .c-icon{font-size:34px;margin-bottom:12px}
.contact-card h3{font-size:16px;font-weight:700;color:#0f172a;margin-bottom:8px}
.contact-card p{font-size:14px;color:#64748b;line-height:1.7}
.contact-card .c-value{font-size:15px;font-weight:600;color:#2563eb;margin:4px 0}
.contact-card .c-link{font-size:16px;font-weight:700;color:#2563eb;margin:4px 0}
.contact-card .c-link a:hover{color:#1d4ed8}

/* ---------- Footer ---------- */
.footer{background:#0f172a;color:#94a3b8;text-align:center;padding:48px 24px 32px;font-size:14px}
.footer .contact{display:flex;justify-content:center;gap:40px;margin-bottom:32px;flex-wrap:wrap}
.footer .contact-item{text-align:center}
.footer .contact-item .label{font-size:12px;color:#475569;margin-bottom:8px}
.footer .contact-item .value{font-size:15px;color:#cbd5e1;font-weight:600}
.footer .contact-item .qrcode{
  width:120px;height:120px;background:#1e293b;border-radius:8px;display:flex;align-items:center;justify-content:center;
  margin:8px auto;border:1px solid #334155;font-size:11px;color:#64748b;cursor:pointer;transition:border-color 0.2s;text-align:center;line-height:1.5
}
.footer .contact-item .qrcode:hover{border-color:#818cf8}
.footer .divider{width:1px;height:80px;background:#1e293b;align-self:center}
.footer p{font-size:13px;color:#475569;margin-top:8px}
.footer .beian{margin-top:12px;padding-top:16px;border-top:1px solid #1e293b;font-size:12px}
.footer .beian a{color:#64748b;text-decoration:none}
.footer .beian a:hover{color:#94a3b8}

/* ---------- 移动端适配 ---------- */
@media(max-width:768px){
  .nav{padding:0 20px}
  .nav-links{gap:14px}
  .nav-links a{font-size:13px}
  .hero{padding:80px 20px 60px}
  .hero h1{font-size:36px}
  .hero .subtitle{font-size:17px}
  .section{padding:60px 20px}
  .features-grid{grid-template-columns:1fr}
  .platform-grid{grid-template-columns:1fr}
  .download-grid{grid-template-columns:1fr}
  .activate-info{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .footer .divider{display:none}
}
@media(max-width:640px){
  .how-steps{grid-template-columns:1fr;gap:24px}
  .nav-links .nav-back{display:none}
}