/* ============================================================
   Nilesoft Shell 中文站 - 全站样式
   配色取自官方 Logo：深蓝 #1668E3 / 主蓝 #1E88F0 / 亮青 #2CC0F5
   ============================================================ */
:root{
  --primary:#1668E3;
  --primary-dark:#0D4FB8;
  --primary-soft:#EAF2FD;
  --accent:#2CC0F5;
  --accent-soft:#E6F8FE;
  --ink:#16233B;
  --muted:#5A6B85;
  --line:#E3ECF7;
  --bg:#FFFFFF;
  --bg-soft:#F5F9FE;
  --radius:14px;
  --shadow:0 6px 24px rgba(22,104,227,.08);
  --font:"Segoe UI","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--primary);text-decoration:none}
a:hover{color:var(--primary-dark)}
img{max-width:100%;display:block}
.container{max-width:1160px;margin:0 auto;padding:0 24px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px}
.brand img{width:32px;height:32px}
.brand-name{font-size:18px;font-weight:700;color:var(--ink);letter-spacing:.2px}
.brand-name span{color:var(--primary)}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav a{
  padding:8px 14px;border-radius:8px;font-size:15px;color:var(--muted);font-weight:500;
}
.main-nav a:hover{color:var(--primary);background:var(--primary-soft)}
.main-nav a.active{color:var(--primary);background:var(--primary-soft);font-weight:600}
/* 导航栏内的 CTA 按钮：恢复按钮自身内边距，不受 .main-nav a 影响 */
.main-nav a.btn{
  padding:10px 22px;border-radius:10px;font-size:14.5px;font-weight:600;
  color:#fff;background:var(--primary);line-height:1;white-space:nowrap;
  box-shadow:0 2px 10px rgba(22,104,227,.28);
}
.main-nav a.btn:hover{
  color:#fff;background:var(--primary-dark);
  transform:translateY(-1px);box-shadow:0 6px 16px rgba(22,104,227,.35);
}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle svg{width:24px;height:24px;stroke:var(--ink)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 28px;border-radius:10px;font-size:16px;font-weight:600;
  cursor:pointer;border:none;font-family:var(--font);transition:all .2s;
  line-height:1;white-space:nowrap;flex-shrink:0;
}
.btn svg{width:18px;height:18px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);color:#fff;transform:translateY(-1px);box-shadow:0 8px 20px rgba(22,104,227,.25)}
.btn-ghost{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-ghost:hover{background:var(--primary-soft);color:var(--primary-dark)}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-lg{padding:14px 36px;font-size:17px}
.btn-light{background:#fff;color:var(--primary)}
.btn-light:hover{background:var(--accent-soft);color:var(--primary-dark)}

/* ---------- Hero ---------- */
.hero{
  background:linear-gradient(135deg,#F0F6FF 0%,#FDFEFF 55%,#E9FAFE 100%);
  padding:88px 0 72px;
  border-bottom:1px solid var(--line);
}
.hero-inner{max-width:820px;margin:0 auto;text-align:center}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;border:1px solid var(--line);border-radius:99px;
  padding:6px 16px;font-size:13.5px;color:var(--muted);margin-bottom:24px;
  box-shadow:var(--shadow);
}
.hero-badge b{color:var(--primary)}
.hero h1{font-size:44px;line-height:1.25;font-weight:800;letter-spacing:.5px}
.hero h1 em{font-style:normal;color:var(--primary);position:relative}
.hero p.lead{font-size:18px;color:var(--muted);margin:20px auto 32px;max-width:640px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-meta{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-top:28px;font-size:14px;color:var(--muted)}
.hero-meta span{display:inline-flex;align-items:center;gap:6px}
.hero-meta svg{width:16px;height:16px;stroke:var(--primary)}

/* ---------- 信任条 ---------- */
.trustbar{background:#fff;border-bottom:1px solid var(--line);padding:26px 0}
.trustbar-inner{display:flex;justify-content:space-around;flex-wrap:wrap;gap:18px}
.trust-item{display:flex;align-items:center;gap:12px}
.trust-item svg{width:30px;height:30px;stroke:var(--primary);flex-shrink:0}
.trust-item b{display:block;font-size:16px;color:var(--ink)}
.trust-item small{font-size:13px;color:var(--muted)}

/* ---------- 通用 Section ---------- */
.section{padding:76px 0}
.section-alt{background:var(--bg-soft)}
.section-head{text-align:center;max-width:680px;margin:0 auto 48px}
.section-head .kicker{
  display:inline-block;font-size:13px;font-weight:700;color:var(--primary);
  text-transform:uppercase;letter-spacing:2px;margin-bottom:12px;
}
.section-head h2{font-size:32px;font-weight:800;line-height:1.3}
.section-head p{color:var(--muted);margin-top:14px;font-size:16.5px}

/* ---------- 卡片网格 ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;transition:all .25s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#CBDDF5}
.card .icon-box{
  width:48px;height:48px;border-radius:12px;background:var(--primary-soft);
  display:flex;align-items:center;justify-content:center;margin-bottom:18px;
}
.card .icon-box svg{width:24px;height:24px;stroke:var(--primary)}
.card.cyan .icon-box{background:var(--accent-soft)}
.card.cyan .icon-box svg{stroke:#0FA3D6}
.card h3{font-size:18px;font-weight:700;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--muted)}

/* ---------- 使用场景编号 ---------- */
.scene-card{position:relative;padding-top:32px}
.scene-num{
  position:absolute;top:-14px;left:24px;width:32px;height:32px;border-radius:9px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  color:#fff;font-size:14px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
}

/* ---------- 菜单演示 ---------- */
.demo-wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:52px;align-items:center}
.demo-note{font-size:13px;color:var(--muted);margin-top:14px}
.demo-menu{
  background:#fff;border:1px solid var(--line);border-radius:12px;
  box-shadow:0 16px 40px rgba(22,104,227,.14);
  padding:8px;width:300px;margin:0 auto;
}
.demo-menu .dm-item{
  display:flex;align-items:center;gap:12px;padding:9px 12px;
  border-radius:8px;font-size:14px;color:var(--ink);
}
.demo-menu .dm-item svg{width:17px;height:17px;stroke:var(--primary);flex-shrink:0}
.demo-menu .dm-item:hover{background:var(--primary-soft)}
.demo-menu .dm-sep{height:1px;background:var(--line);margin:6px 10px}
.demo-menu .dm-sub{margin-left:26px;font-size:12.5px;color:var(--muted)}
.demo-menu .dm-head{
  display:flex;align-items:center;gap:12px;padding:9px 12px;font-weight:700;font-size:14px;
}
.demo-menu .dm-head svg{width:17px;height:17px;stroke:var(--primary)}
.demo-columns{display:grid;grid-template-columns:1fr 1fr;gap:2px}

/* ---------- 功能列表页 ---------- */
.feature-block{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:64px}
.feature-block:last-child{margin-bottom:0}
.feature-block.flip .fb-text{order:2}
.fb-text h3{font-size:24px;font-weight:800;margin-bottom:14px}
.fb-text p{color:var(--muted);font-size:15.5px;margin-bottom:14px}
.fb-text ul{list-style:none;margin-top:8px}
.fb-text ul li{
  padding:7px 0 7px 26px;position:relative;font-size:15px;color:var(--ink);
}
.fb-text ul li::before{
  content:"";position:absolute;left:0;top:14px;width:16px;height:16px;
  background:var(--primary-soft);border-radius:50%;
}
.fb-text ul li::after{
  content:"";position:absolute;left:4.5px;top:18px;width:7px;height:4px;
  border-left:2px solid var(--primary);border-bottom:2px solid var(--primary);
  transform:rotate(-45deg);
}
.code-box{
  background:#0F1B33;color:#D7E6FF;border-radius:12px;
  padding:22px 24px;font-family:"Cascadia Code",Consolas,monospace;
  font-size:13.5px;line-height:1.85;overflow-x:auto;
}
.code-box .cm{color:#6C8BC4}
.code-box .kw{color:#59C2FF}
.code-box .st{color:#8BE28B}

/* ---------- 下载页 ---------- */
.dl-hero{background:linear-gradient(135deg,var(--primary) 0%,#0B56C9 55%,#0FA3D6 100%);color:#fff;padding:64px 0;text-align:center}
.dl-hero h1{font-size:36px;font-weight:800}
.dl-hero p{margin-top:12px;opacity:.92;font-size:16.5px}
.dl-version{
  display:inline-block;margin-top:20px;background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.3);border-radius:99px;padding:7px 20px;font-size:14.5px;
}
.dl-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:32px;box-shadow:var(--shadow);
}
.dl-card-head{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:12px;margin-bottom:8px}
.dl-card-head h2{font-size:24px;font-weight:800}
.dl-tag{background:var(--accent-soft);color:#0FA3D6;font-size:12.5px;font-weight:700;border-radius:99px;padding:4px 12px}
.dl-card > p{color:var(--muted);font-size:15px;margin-bottom:22px}
.dl-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.dl-option{
  border:1.5px solid var(--line);border-radius:12px;padding:20px;
  display:flex;justify-content:space-between;align-items:center;gap:14px;
  transition:border-color .2s;
}
.dl-option:hover{border-color:var(--primary)}
.dl-option b{display:block;font-size:15.5px}
.dl-option small{color:var(--muted);font-size:13px}
.dl-arch{display:flex;align-items:center;gap:12px}
.dl-arch svg{width:26px;height:26px;stroke:var(--primary);flex-shrink:0}
.pkg-box{
  background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:22px 24px;
}
.pkg-box h4{font-size:15px;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.pkg-box pre{
  background:#0F1B33;color:#8BE28B;border-radius:8px;padding:10px 16px;
  font-family:Consolas,monospace;font-size:13.5px;overflow-x:auto;
}
.req-table{width:100%;border-collapse:collapse;font-size:14.5px}
.req-table th,.req-table td{border:1px solid var(--line);padding:11px 16px;text-align:left}
.req-table th{background:var(--bg-soft);font-weight:700;width:200px}
.note-box{
  background:var(--primary-soft);border-left:4px solid var(--primary);
  border-radius:0 10px 10px 0;padding:16px 20px;font-size:14.5px;color:var(--ink);
}
.note-box b{color:var(--primary-dark)}

/* ---------- FAQ ---------- */
.faq-list{max-width:800px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:12px;background:#fff;margin-bottom:14px;overflow:hidden}
.faq-q{
  width:100%;background:none;border:none;cursor:pointer;text-align:left;
  padding:18px 22px;font-size:16px;font-weight:600;color:var(--ink);
  display:flex;justify-content:space-between;align-items:center;gap:16px;font-family:var(--font);
}
.faq-q::after{
  content:"";width:10px;height:10px;flex-shrink:0;
  border-right:2.5px solid var(--primary);border-bottom:2.5px solid var(--primary);
  transform:rotate(45deg);transition:transform .25s;margin-top:-4px;
}
.faq-item.open .faq-q::after{transform:rotate(225deg);margin-top:4px}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:0 22px 18px;color:var(--muted);font-size:15px}
.faq-a-inner a{font-weight:600}

/* ---------- CTA 区 ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--primary) 0%,#0B56C9 60%,#0FA3D6 100%);
  color:#fff;text-align:center;padding:70px 0;
}
.cta-band h2{font-size:30px;font-weight:800}
.cta-band p{margin:14px auto 28px;opacity:.92;max-width:560px;font-size:16px}

/* ---------- 页脚 ---------- */
.site-footer{background:#0E1930;color:#9FB1CC;padding:56px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;padding-bottom:40px}
.footer-grid h4{color:#fff;font-size:15px;margin-bottom:16px;font-weight:700}
.footer-grid a{color:#9FB1CC;display:block;padding:5px 0}
.footer-grid a:hover{color:#fff}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand img{width:30px;height:30px}
.footer-brand b{color:#fff;font-size:17px}
.footer-desc{max-width:300px;line-height:1.8}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:18px 0;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:13px;color:#6D7F9C;
}

/* ---------- 下载弹窗 ---------- */
.modal-mask{
  position:fixed;inset:0;background:rgba(10,20,40,.55);z-index:200;
  display:none;align-items:center;justify-content:center;padding:20px;
}
.modal-mask.show{display:flex}
.modal{
  background:#fff;border-radius:18px;max-width:560px;width:100%;
  padding:36px 34px;position:relative;text-align:center;
  animation:pop .25s ease;max-height:90vh;overflow-y:auto;
}
@keyframes pop{from{transform:scale(.94);opacity:0}to{transform:scale(1);opacity:1}}
.modal-close{
  position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:50%;
  border:none;background:var(--bg-soft);cursor:pointer;font-size:18px;color:var(--muted);
  display:flex;align-items:center;justify-content:center;
}
.modal-close:hover{background:var(--line);color:var(--ink)}
.modal h3{font-size:22px;font-weight:800;margin-bottom:8px}
.modal .modal-sub{color:var(--muted);font-size:14.5px;margin-bottom:24px}
.qr-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.qr-item{
  border:1.5px dashed #BBD2F0;border-radius:14px;padding:20px 14px;background:var(--bg-soft);
}
.qr-frame{
  width:132px;height:132px;margin:0 auto 12px;background:#fff;
  border:1px solid var(--line);border-radius:10px;overflow:hidden;
  display:flex;align-items:center;justify-content:center;
}
.qr-frame img{width:100%;height:100%;object-fit:contain}
.qr-empty{font-size:12px;color:#9AB0CE;text-align:center;line-height:1.6}
.qr-item b{display:block;font-size:15px;color:var(--ink)}
.qr-item small{color:var(--muted);font-size:12.5px}
.modal-tip{margin-top:22px;font-size:13px;color:var(--muted);background:var(--bg-soft);border-radius:10px;padding:12px 16px}

/* ---------- 回到顶部 ---------- */
.back-top{
  position:fixed;right:26px;bottom:26px;width:44px;height:44px;border-radius:12px;
  background:var(--primary);color:#fff;border:none;cursor:pointer;z-index:90;
  display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;
  transition:opacity .3s;box-shadow:0 8px 20px rgba(22,104,227,.3);
}
.back-top.show{opacity:1;pointer-events:auto}
.back-top svg{width:20px;height:20px;stroke:#fff}

/* ---------- 页头横幅（内页） ---------- */
.page-hero{background:linear-gradient(135deg,#F0F6FF 0%,#FDFEFF 60%,#E9FAFE 100%);border-bottom:1px solid var(--line);padding:56px 0;text-align:center}
.page-hero h1{font-size:34px;font-weight:800}
.page-hero p{color:var(--muted);margin-top:12px;font-size:16.5px;max-width:640px;margin-left:auto;margin-right:auto}
.breadcrumb{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--primary)}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .demo-wrap,.feature-block{grid-template-columns:1fr;gap:32px}
  .feature-block.flip .fb-text{order:0}
}
@media (max-width:680px){
  .hero h1{font-size:31px}
  .hero{padding:60px 0 52px}
  .section{padding:56px 0}
  .main-nav{
    position:fixed;top:64px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;padding:12px 20px 20px;border-bottom:1px solid var(--line);
    display:none;box-shadow:0 12px 24px rgba(22,35,59,.08);
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:13px 14px;font-size:16px}
  .main-nav a.btn{margin-top:8px;padding:13px 22px;font-size:16px;justify-content:center}
  .nav-toggle{display:block}
  .grid-3,.grid-2,.dl-grid,.qr-row{grid-template-columns:1fr}
  .trustbar-inner{flex-direction:column;align-items:flex-start;gap:16px}
  .footer-grid{grid-template-columns:1fr}
  .hero-actions .btn{width:100%;max-width:320px}
  .section-head h2{font-size:26px}
  .dl-option{flex-direction:column;align-items:stretch;text-align:center}
}