/* ===== IPCiper 官网样式 ===== */
:root{
  --bg:#f5f7fb; --panel:#ffffff; --panel2:#eef2f9; --line:#dde3ef;
  --text:#1b2440; --muted:#5d6b88;
  --brand:#2bacb2; --brand2:#0d7d81;
  --glow:rgba(43,172,178,.14); --glow2:rgba(13,125,129,.12);
  --radius:16px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;line-height:1.6;
}
a{color:inherit;text-decoration:none;}
.muted{color:var(--muted);}
.hidden{display:none!important;}

/* ===== 按钮 ===== */
.btn{
  display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;
  padding:11px 20px;font-weight:600;cursor:pointer;font-size:14px;transition:.18s;
}
.btn:hover{filter:brightness(1.1);transform:translateY(-1px);}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text);}
.btn.ghost:hover{border-color:var(--brand);}
.btn.big{padding:14px 28px;font-size:15px;border-radius:12px;}
.btn.block{display:block;width:100%;text-align:center;margin-top:18px;}

/* ===== 导航 ===== */
.nav{
  position:sticky;top:0;z-index:100;
  background:rgba(4,44,46,.85);backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(89,239,246,.16);
}
.nav-inner{max-width:1180px;margin:0 auto;padding:0 24px;height:64px;display:flex;align-items:center;gap:24px;}
.logo{font-weight:800;font-size:21px;letter-spacing:.2px;color:var(--text);}
.logo span{color:var(--brand2);}
.nav .logo{color:#eafff2;}
.nav .logo span{color:#59eff6;}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:auto;}
.nav-item{position:relative;}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;background:none;border:0;
  color:#c4dedf;font-size:14px;font-weight:600;cursor:pointer;padding:10px 12px;
  font-family:inherit;border-radius:8px;transition:.15s;
}
.nav-link:hover{color:#59eff6;}
.drop{
  position:absolute;top:100%;left:0;min-width:190px;padding:8px;
  background:rgba(8,54,57,.98);border:1px solid rgba(89,239,246,.18);border-radius:12px;
  box-shadow:0 16px 40px rgba(0,0,0,.32);
  opacity:0;visibility:hidden;transform:translateY(8px);transition:.2s;
}
.nav-item:hover .drop{opacity:1;visibility:visible;transform:translateY(0);}
.drop a{display:block;padding:9px 14px;color:#c4dedf;font-size:13.5px;border-radius:8px;transition:.12s;}
.drop a:hover{background:rgba(89,239,246,.12);color:#59eff6;}
.drop a .desc{display:block;font-size:12px;color:#7fb6ba;font-weight:400;margin-top:2px;}
.drop-plans{min-width:340px;padding:14px;}
.drop-plans .drop-title{font-size:12px;font-weight:700;color:#59eff6;letter-spacing:.5px;margin:0 0 12px;padding:0 6px;}
.drop-plans .plan{padding:12px 10px;border-radius:10px;transition:.15s;}
.drop-plans .plan:hover{background:rgba(89,239,246,.08);}
.drop-plans .plan-name{font-size:14px;font-weight:700;color:#eafff2;margin-bottom:3px;}
.drop-plans .plan-desc{font-size:12px;color:#7fb6ba;line-height:1.5;margin-bottom:10px;}
.drop-plans .plan-item{
  display:inline-flex;align-items:center;gap:7px;color:#59eff6;font-size:13px;font-weight:600;
  padding:6px 12px;border:1px solid rgba(89,239,246,.25);border-radius:999px;transition:.12s;
}
.drop-plans .plan-item::before{content:"";width:6px;height:6px;border-radius:50%;background:#59eff6;box-shadow:0 0 6px #59eff6;}
.drop-plans .plan-item:hover{background:rgba(89,239,246,.14);color:#eafff2;}
.nav-actions{display:flex;align-items:center;gap:12px;}
.lang-btn{
  background:transparent;border:1px solid rgba(255,255,255,.25);color:#c4dedf;border-radius:9px;
  padding:8px 12px;font-size:13px;cursor:pointer;font-weight:600;
}
.lang-btn:hover{color:#fff;border-color:#59eff6;}
.nav-actions .btn.ghost{border-color:rgba(255,255,255,.28);color:#d7f0f2;}
.nav-actions .btn.ghost:hover{border-color:#59eff6;color:#fff;}
.nav-burger{display:none;background:transparent;border:1px solid rgba(255,255,255,.25);color:#eafff2;font-size:20px;border-radius:9px;padding:6px 12px;cursor:pointer;}

/* ===== Hero ===== */
.hero{
  padding:110px 24px 96px;
  position:relative;
  background:
    radial-gradient(1000px 560px at 82% -12%, rgba(43,172,178,.32) 0, transparent 60%),
    radial-gradient(760px 460px at 8% 12%, rgba(89,239,246,.18) 0, transparent 55%),
    linear-gradient(rgba(4,44,46,.60), rgba(4,44,46,.60)),
    url("/static/assets/header-bg.webp") center/cover no-repeat,
    #042c2e;
  color:#eafff2;
  overflow:hidden;
}
.hero-inner{max-width:1180px;margin:0 auto;text-align:center;position:relative;z-index:1;}
.hero-title{font-size:54px;line-height:1.25;margin:0 0 22px;font-weight:800;letter-spacing:-.5px;color:#eafff2;}
.hero-title .gradient-text{
  background:linear-gradient(90deg,#59eff6,#2bacb2);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:transparent;
}
.hero-sub{max-width:720px;margin:0 auto 40px;font-size:18px;color:#a8cacc;}
.hero-list{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:0 0 40px;padding:0;list-style:none;}
.hero-list li{
  display:flex;align-items:center;gap:8px;padding:11px 22px;
  background:rgba(255,255,255,.06);border:1px solid rgba(89,239,246,.22);border-radius:999px;
  color:#d7f0f2;font-size:15px;font-weight:600;backdrop-filter:blur(6px);
}
.hero-list li .ic{display:inline-flex;}
.hero-list li .ic img{width:16px;height:16px;display:block;}
.hero-cta{display:flex;gap:14px;justify-content:center;margin-bottom:26px;}
.hero .btn.ghost{border-color:rgba(255,255,255,.32);color:#d7f0f2;}
.hero .btn.ghost:hover{border-color:#59eff6;color:#fff;}
.hero-tip{display:inline-flex;align-items:center;gap:5px;font-size:13px;color:#7fb6ba;}
.hero-tip .hl{color:#59eff6;font-weight:600;}

/* ===== 通用区块 ===== */
.section{padding:88px 24px;}
.section.alt{background:var(--panel);}
.section-inner{max-width:1180px;margin:0 auto;}
.section-inner.narrow{max-width:820px;}
.section-title{font-size:34px;font-weight:800;text-align:center;margin:0 0 12px;letter-spacing:-.3px;}
.section-sub{text-align:center;color:var(--muted);font-size:15.5px;margin:0 0 48px;}

/* ===== 产品模式 ===== */
.mode-cards{display:grid;grid-template-columns:1fr 1fr;gap:24px;max-width:900px;margin:0 auto;}
.mode-card{
  position:relative;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:36px 32px;transition:.2s;
}
.mode-card:hover{transform:translateY(-4px);border-color:var(--brand);}
.mode-card.featured{border-color:var(--brand2);box-shadow:0 0 0 1px var(--brand2),0 20px 50px rgba(43,172,178,.12);}
.mode-ribbon{
  position:absolute;top:-12px;right:24px;background:var(--brand2);color:#033e40;font-size:12px;
  font-weight:700;padding:4px 12px;border-radius:999px;
}
.mode-icon{font-size:34px;margin-bottom:14px;}
.mode-card h3{font-size:22px;margin:0 0 8px;}
.mode-tag{display:inline-block;color:var(--brand);font-size:13px;font-weight:600;margin:0 0 18px;}
.mode-price{display:flex;align-items:baseline;gap:8px;margin:-4px 0 18px;padding-bottom:16px;border-bottom:1px solid var(--line);}
.mode-price strong{font-size:30px;line-height:1.1;color:var(--brand2);letter-spacing:-.5px;}
.mode-price span{color:var(--muted);font-size:13px;font-weight:600;}
.mode-list{list-style:none;padding:0;margin:0 0 8px;}
.mode-list li{padding:8px 0 8px 26px;position:relative;color:var(--muted);font-size:14.5px;}
.mode-list li::before{content:"✓";position:absolute;left:0;color:var(--brand2);font-weight:700;}

/* ===== 特性 ===== */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.feat{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.18s;}
.feat:hover{border-color:var(--brand);transform:translateY(-3px);}
.feat-icon{font-size:26px;margin-bottom:12px;}
.feat h3{font-size:17px;margin:0 0 8px;}
.feat p{color:var(--muted);font-size:14px;margin:0;}

/* ===== 场景 ===== */
.scene-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.scene{
  display:flex;align-items:center;gap:14px;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:20px 22px;font-size:15.5px;font-weight:600;transition:.15s;
}
.scene:hover{border-color:var(--brand);}
.scene-icon{font-size:24px;}

/* ===== 接入方式 ===== */
.integ-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:20px;}
.integ-tab{
  background:var(--panel);border:1px solid var(--line);color:var(--muted);padding:9px 18px;
  border-radius:9px;cursor:pointer;font-size:14px;font-weight:600;font-family:inherit;
}
.integ-tab.active{color:var(--text);border-color:var(--brand);background:var(--panel2);}
.code-panel{max-width:760px;margin:0 auto;background:#0d1428;border:1px solid #16203a;border-radius:14px;overflow:hidden;}
.code-head{background:#131a2e;padding:10px 18px;font-size:13px;color:#93a0bd;border-bottom:1px solid #1a2238;}
.code{padding:18px 20px;margin:0;overflow-x:auto;font-size:13.5px;line-height:1.7;}
.code code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#c9d4ee;white-space:pre;}
.c-var{color:var(--brand2);}
.integ-note{text-align:center;color:var(--muted);font-size:13.5px;margin-top:20px;}

/* ===== 全球网络资源 ===== */
.flag-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;max-width:820px;margin:0 auto;}
.flag-item{
  display:flex;align-items:center;gap:14px;background:var(--bg);border:1px solid var(--line);
  border-radius:14px;padding:16px 20px;transition:.15s;
}
.flag-item:hover{border-color:var(--brand);transform:translateY(-2px);}
.flag-item img{width:32px;height:32px;border-radius:50%;object-fit:cover;box-shadow:0 0 0 1px var(--line);flex-shrink:0;}
.flag-item span{font-size:15px;font-weight:600;}
.cover-more{text-align:center;color:var(--muted);font-size:14px;margin-top:24px;}

/* ===== 服务保障 ===== */
.assure-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}
.assure-left img{width:100%;max-width:560px;display:block;margin:0 auto;}
.assure-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:18px;}
.assure-item{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px 24px;transition:border-color .2s, box-shadow .2s;cursor:pointer;}
.assure-item:hover{border-color:rgba(43,172,178,.5);}
.assure-item.active{border-color:var(--brand);box-shadow:0 8px 24px rgba(43,172,178,.12);}
.assure-head{display:flex;align-items:center;gap:14px;}
.assure-head img{width:46px;height:46px;flex-shrink:0;transition:transform .25s;}
.assure-item.active .assure-head img{transform:scale(1.08);}
.assure-head span{font-size:18px;font-weight:700;}
.assure-body{max-height:0;overflow:hidden;opacity:0;margin:0;color:var(--muted);font-size:14.5px;line-height:1.7;transition:max-height .35s ease, opacity .3s ease, margin .35s ease;}
.assure-item.active .assure-body{max-height:220px;opacity:1;margin-top:8px;}

/* ===== FAQ ===== */
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:0 22px;}
.faq summary{
  cursor:pointer;font-weight:600;font-size:15.5px;padding:18px 0;list-style:none;
  display:flex;justify-content:space-between;align-items:center;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{content:"+";font-size:20px;color:var(--muted);transition:.2s;}
.faq[open] summary::after{transform:rotate(45deg);}
.faq p{color:var(--muted);font-size:14.5px;margin:0 0 18px;}

/* ===== 页脚 ===== */
.footer{background:var(--panel);border-top:1px solid var(--line);padding:48px 24px;}
.footer-inner{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;gap:32px;align-items:flex-start;justify-content:space-between;}
.footer-brand p{font-size:13.5px;}
.footer-links{display:flex;flex-wrap:wrap;gap:20px;font-size:14px;color:var(--muted);}
.footer-links a:hover{color:var(--text);}
.footer-copy{max-width:420px;font-size:13px;}
.footer-copy p{margin:0 0 8px;}
.footer-contact{min-width:180px;}
.footer-contact p{font-size:13.5px;margin:0 0 8px;}
.tg-link{
  display:inline-block;background:var(--brand);color:#fff;border-radius:10px;
  padding:9px 16px;font-weight:600;font-size:14px;transition:.18s;
}
.tg-link:hover{filter:brightness(1.1);transform:translateY(-1px);}

/* ===== 响应式 ===== */
@media(max-width:900px){
  .nav-links{
    position:absolute;top:64px;left:0;right:0;background:rgba(4,44,46,.98);border-bottom:1px solid rgba(89,239,246,.16);
    flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 16px;display:none;
  }
  .nav-links.open{display:flex;}
  .nav-item{width:100%;}
  .nav-link{padding:13px 4px;width:100%;text-align:left;color:#d7f0f2;font-size:15px;border-bottom:1px solid rgba(89,239,246,.12);}
  .nav-item .drop{position:static;opacity:1;visibility:visible;transform:none;background:transparent;border:0;box-shadow:none;padding:4px 0 10px 16px;display:block;}
  .drop a{padding:8px 10px;}
  .drop-plans{min-width:0;padding:0;}
  .nav-burger{display:block;margin-left:auto;}
  .nav-actions .btn.ghost{display:none;}
  .hero-title{font-size:34px;}
  .mode-cards,.feat-grid,.scene-grid,.assure-grid{grid-template-columns:1fr;}
  .assure-left{display:none;}
}