@charset "UTF-8";
/* ============================================================
   狗急加速器 — 全站共用样式表
   所有页面通过 <link rel="stylesheet" href="assets/style.css"> 引用
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root{
  --primary:#2563EB;
  --primary-dark:#1D4ED8;
  --cyan:#06B6D4;
  --deep-blue:#1E3A5F;
  --green:#10B981;
  --amber:#F59E0B;
  --bg-dark:#0F172A;
  --bg-dark2:#1E293B;
  --bg-light:#F8FAFC;
  --white:#FFFFFF;
  --text-primary:#1E293B;
  --text-secondary:#64748B;
  --text-muted:#94A3B8;      /* 仅用于深色背景，浅色背景请用 --text-secondary */
  --border:#E2E8F0;
  --radius-sm:8px;
  --radius:12px;
  --radius-lg:16px;
  --radius-xl:24px;
  --shadow-sm:0 4px 20px rgba(0,0,0,.06);
  --shadow-md:0 8px 25px rgba(0,0,0,.08);
  --shadow-lg:0 12px 40px rgba(0,0,0,.1);
  --maxw:1100px;
}

/* ---------- 2. 基础重置 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Helvetica Neue',Arial,sans-serif;
  color:var(--text-primary);
  line-height:1.6;
  overflow-x:hidden;
  background:var(--white);
}
img{max-width:100%;height:auto;border-style:none}
main{display:block}
a{color:var(--primary)}
/* 锚点跳转时为固定顶栏留出偏移 */
[id]{scroll-margin-top:90px}

/* ---------- 3. 无障碍辅助 ---------- */
.skip-link{
  position:absolute;left:-9999px;top:0;z-index:2000;
  background:var(--primary);color:#fff;padding:12px 18px;
  border-radius:0 0 var(--radius) 0;text-decoration:none;font-size:14px;
}
.skip-link:focus{left:0}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
:focus-visible{outline:3px solid var(--cyan);outline-offset:2px}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}

/* ---------- 4. 顶部导航 ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:1000;
  padding:0 40px;height:72px;
  display:flex;align-items:center;justify-content:space-between;
  transition:background .3s ease,box-shadow .3s ease;
}
header.scrolled,
header.solid{
  background:rgba(255,255,255,.95);
  box-shadow:0 2px 20px rgba(0,0,0,.08);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
header .logo{display:flex;align-items:center;gap:10px;text-decoration:none}
header .logo img{width:40px;height:40px;border-radius:8px}
header .logo span{font-size:20px;font-weight:700;color:var(--white)}
header.scrolled .logo span,
header.solid .logo span{color:var(--primary)}
nav{display:flex;align-items:center;gap:24px}
nav a{
  text-decoration:none;font-size:15px;color:rgba(255,255,255,.85);
  position:relative;padding:4px 0;transition:color .2s;white-space:nowrap;
}
header.scrolled nav a,
header.solid nav a{color:var(--text-primary)}
nav a:hover,nav a.active{color:var(--primary)}
nav a::after{
  content:'';position:absolute;bottom:-2px;left:50%;width:0;height:2px;
  background:var(--primary);transition:all .3s ease;transform:translateX(-50%);
}
nav a:hover::after,nav a.active::after{width:100%}
.nav-cta{
  background:var(--primary);color:#fff !important;
  padding:8px 20px !important;border-radius:20px;font-weight:500;transition:all .3s;
}
.nav-cta:hover{background:var(--primary-dark);transform:translateY(-1px)}
.nav-cta::after{display:none}
.hamburger{
  display:none;flex-direction:column;gap:5px;cursor:pointer;z-index:1001;
  background:none;border:none;padding:0;
}
.hamburger span{width:26px;height:2px;background:var(--white);transition:all .3s}
header.scrolled .hamburger span,
header.solid .hamburger span{background:var(--text-primary)}

/* ---------- 5. 通用布局 ---------- */
.section{padding:80px 40px}
.section-header{text-align:center;margin-bottom:56px}
.section-header h2{font-size:36px;font-weight:700;margin-bottom:10px}
.section-header p{font-size:16px;color:var(--text-secondary);max-width:640px;margin:0 auto}
.section-header .more{
  display:inline-block;margin-top:16px;font-size:15px;font-weight:600;
  color:var(--primary);text-decoration:none;
}
.section-header .more:hover{text-decoration:underline}
.page-hero{
  padding:132px 40px 60px;
  background:linear-gradient(135deg,var(--bg-dark),var(--deep-blue));
  text-align:center;
}
.page-hero h1{font-size:40px;color:var(--white);margin-bottom:12px;line-height:1.25}
.page-hero p{color:var(--text-muted);font-size:17px;max-width:680px;margin:0 auto}
.page-hero .hero-cta{justify-content:center;margin-top:26px}

.breadcrumb{
  max-width:var(--maxw);margin:0 auto;padding:96px 40px 0;
  font-size:13px;color:var(--text-secondary);
}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.breadcrumb a{color:var(--text-secondary);text-decoration:none}
.breadcrumb a:hover{color:var(--primary);text-decoration:underline}
.breadcrumb li+li::before{content:'/';margin-right:6px;color:var(--text-muted)}

/* ---------- 6. 按钮 ---------- */
.btn-primary{
  background:var(--primary);color:#fff;padding:14px 40px;border-radius:var(--radius);
  font-size:16px;font-weight:600;border:none;cursor:pointer;text-decoration:none;
  display:inline-flex;align-items:center;gap:8px;transition:all .3s;
  position:relative;overflow:hidden;
}
.btn-primary::before{
  content:'';position:absolute;top:50%;left:50%;width:0;height:0;border-radius:50%;
  background:rgba(255,255,255,.3);transform:translate(-50%,-50%);
  transition:width .6s,height .6s;
}
.btn-primary:hover::before{width:400px;height:400px}
.btn-primary:hover{transform:scale(1.05);box-shadow:0 8px 30px rgba(37,99,235,.4)}
.btn-outline{
  background:transparent;color:#fff;padding:14px 40px;border-radius:var(--radius);
  font-size:16px;font-weight:600;border:2px solid rgba(255,255,255,.3);
  cursor:pointer;text-decoration:none;transition:all .3s;
}
.btn-outline:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- 7. 首屏 Hero ---------- */
.hero{
  min-height:100vh;
  background:linear-gradient(135deg,#0F172A 0%,#1E1B4B 50%,#1E3A5F 100%);
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:hidden;padding:100px 40px 80px;
}
.hero-particles{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none}
.hero-particles canvas{position:absolute;top:0;left:0}
.hero-content{
  max-width:1200px;width:100%;display:flex;align-items:center;
  gap:60px;position:relative;z-index:2;
}
.hero-text{flex:1}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.hero-tags span{
  background:rgba(37,99,235,.2);color:var(--cyan);padding:6px 14px;
  border-radius:20px;font-size:13px;border:1px solid rgba(37,99,235,.3);
}
.hero h1{font-size:56px;font-weight:700;line-height:1.2;color:var(--white);margin-bottom:16px;text-shadow:0 2px 20px rgba(0,0,0,.3)}
.hero h1 span{color:var(--cyan)}
.hero p.subtitle{font-size:20px;color:var(--text-muted);margin-bottom:32px;max-width:560px}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-visual{flex:1;position:relative}

.vpn-simulator{
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-xl);padding:28px;max-width:440px;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.sim-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.sim-header .sim-logo{display:flex;align-items:center;gap:8px;color:#fff;font-weight:600;font-size:15px}
.sim-header .sim-logo svg{width:28px;height:28px}
.sim-status{display:flex;align-items:center;gap:6px;font-size:13px;color:var(--green)}
.sim-dot{width:8px;height:8px;border-radius:50%;background:var(--green);animation:pulse-dot 2s infinite}
@keyframes pulse-dot{
  0%,100%{box-shadow:0 0 0 0 rgba(16,185,129,.4)}
  50%{box-shadow:0 0 0 12px rgba(16,185,129,0)}
}
.sim-main{text-align:center;padding:24px 0}
.sim-speed-display{font-size:64px;font-weight:700;color:var(--white);line-height:1}
.sim-speed-display small{font-size:20px;color:var(--text-muted)}
.sim-speed-label{color:var(--text-muted);font-size:14px;margin-top:4px}
.sim-progress{height:4px;background:rgba(255,255,255,.1);border-radius:2px;margin:20px 0;overflow:hidden}
.sim-progress-bar{
  height:100%;background:linear-gradient(90deg,var(--green),var(--cyan));
  border-radius:2px;width:76%;animation:progress-shift 3s ease-in-out infinite;
}
@keyframes progress-shift{0%,100%{width:72%}50%{width:88%}}
.sim-node{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 16px;background:rgba(255,255,255,.05);
  border-radius:var(--radius);margin-bottom:10px;
}
.sim-node .node-name{color:#fff;font-size:14px}
.sim-node .node-ping{color:var(--green);font-size:13px;font-weight:600}
.sim-node.active{border:1px solid rgba(6,182,212,.4);background:rgba(6,182,212,.08)}
.sim-footer{text-align:center;margin-top:16px}
.sim-btn{
  background:var(--primary);color:#fff;border:none;padding:10px 32px;
  border-radius:24px;font-size:14px;cursor:pointer;font-weight:500;
  text-decoration:none;display:inline-block;
}
.sim-btn:hover{background:var(--primary-dark)}

/* ---------- 8. 数据指标 ---------- */
.stats-section{background:var(--bg-light);padding:60px 40px}
.stats-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr);gap:20px}
.stat-card{
  background:var(--white);border-radius:var(--radius-lg);padding:28px 20px;
  text-align:center;border:1px solid var(--border);transition:all .3s;
}
.stat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:var(--primary)}
.stat-card .stat-icon{font-size:32px;margin-bottom:10px;line-height:1}
.stat-card .stat-num{font-size:32px;font-weight:700;color:var(--primary)}
.stat-card .stat-label{font-size:14px;color:var(--text-secondary);margin-top:6px}

/* ---------- 9. 核心功能 ---------- */
.features-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{
  background:var(--white);border-radius:var(--radius-lg);padding:32px;
  border:1px solid var(--border);transition:all .4s ease;
}
.feature-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.feature-card .feat-icon{
  width:56px;height:56px;background:rgba(37,99,235,.08);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;font-size:28px;
  margin-bottom:18px;transition:transform .3s;
}
.feature-card:hover .feat-icon{transform:scale(1.1)}
.feature-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-secondary);line-height:1.75}
.feature-card .feat-tags{margin-top:12px;display:flex;gap:6px;flex-wrap:wrap}
.feature-card .feat-tags span{
  font-size:11px;padding:3px 10px;border-radius:12px;
  background:rgba(37,99,235,.06);color:var(--primary);
}

/* ---------- 10. 技术优势 ---------- */
.tech-section{background:var(--bg-light)}
.tech-block{
  max-width:var(--maxw);margin:0 auto 80px;
  display:flex;align-items:center;gap:60px;
}
.tech-block:last-child{margin-bottom:0}
.tech-block:nth-child(even){flex-direction:row-reverse}
.tech-text{flex:1}
.tech-text h3{font-size:28px;font-weight:700;margin-bottom:16px}
.tech-text p{color:var(--text-secondary);margin-bottom:16px;line-height:1.85}
.tech-text ul{list-style:none}
.tech-text ul li{padding:6px 0;color:var(--text-secondary)}
.tech-text ul li::before{content:'✓ ';color:var(--green);font-weight:700}
.tech-visual{
  flex:1;background:var(--white);border-radius:var(--radius-lg);padding:32px;
  text-align:center;border:1px solid var(--border);min-height:280px;
  display:flex;align-items:center;justify-content:center;
}
.tech-visual p{margin-top:12px;color:var(--text-secondary);font-size:13px}

/* ---------- 11. 应用场景 ---------- */
.scenario-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.scenario-card{
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:32px;transition:all .3s;
}
.scenario-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.scenario-card .scenario-icon{font-size:40px;margin-bottom:12px;line-height:1}
.scenario-card h3{font-size:20px;font-weight:600;margin-bottom:10px}
.scenario-card p{color:var(--text-secondary);font-size:14px;line-height:1.85;margin-bottom:16px}
.scenario-stat{
  display:inline-block;background:rgba(16,185,129,.1);color:var(--green);
  padding:6px 16px;border-radius:20px;font-size:13px;font-weight:600;
}

/* ---------- 12. 用户评价 ---------- */
.testimonials-section{background:var(--bg-light)}
.testimonial-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.testimonial-card{
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:28px;box-shadow:var(--shadow-sm);
}
.testimonial-card .t-user{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.testimonial-card .t-avatar{
  width:44px;height:44px;border-radius:50%;background:var(--primary);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:600;font-size:18px;flex:none;
}
.testimonial-card .t-name{font-weight:600}
.testimonial-card .t-tag{font-size:13px;color:var(--text-secondary)}
.testimonial-card .t-stars{color:var(--amber);margin-bottom:10px;font-size:16px;letter-spacing:2px}
.testimonial-card .t-text{color:var(--text-secondary);line-height:1.85;font-size:14px}

/* ---------- 13. 价格套餐 ---------- */
.pricing-section{background:var(--white)}
.pricing-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.pricing-card{
  background:var(--white);border-radius:var(--radius-lg);padding:32px 24px;
  border:2px solid var(--border);text-align:center;transition:all .3s;position:relative;
}
.pricing-card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.pricing-card.recommended{border-color:var(--primary);box-shadow:0 8px 30px rgba(37,99,235,.15)}
.pricing-card .popular-tag{
  position:absolute;top:-14px;left:50%;transform:translateX(-50%);
  background:var(--primary);color:#fff;padding:4px 18px;border-radius:20px;
  font-size:12px;font-weight:600;
}
.pricing-card h3{font-size:20px;margin-bottom:16px}
.pricing-card .price{font-size:40px;font-weight:700;color:var(--text-primary);margin-bottom:4px}
.pricing-card .price small{font-size:16px;font-weight:400;color:var(--text-secondary)}
.pricing-card .price-period{font-size:13px;color:var(--text-secondary);margin-bottom:20px}
.pricing-card ul{list-style:none;text-align:left;margin-bottom:24px}
.pricing-card ul li{
  padding:8px 0;font-size:14px;color:var(--text-secondary);
  border-bottom:1px solid rgba(0,0,0,.04);
}
.pricing-card ul li .check{color:var(--green);margin-right:6px}
.pricing-card .pricing-btn{
  display:block;padding:12px;border-radius:var(--radius);font-weight:600;
  text-decoration:none;transition:all .3s;border:2px solid var(--primary);
  color:var(--primary);background:transparent;font-size:15px;cursor:pointer;
}
.pricing-card.recommended .pricing-btn{background:linear-gradient(135deg,var(--primary),var(--cyan));color:#fff;border:none}
.pricing-card .pricing-btn:hover{background:var(--primary);color:#fff}

.table-scroll{max-width:var(--maxw);margin:48px auto 0;overflow-x:auto;-webkit-overflow-scrolling:touch}
table.compare{
  width:100%;min-width:720px;border-collapse:separate;border-spacing:0;
  background:var(--white);border:1px solid var(--border);
  border-radius:var(--radius-lg);overflow:hidden;font-size:14px;
}
table.compare caption{
  caption-side:top;text-align:left;font-size:20px;font-weight:700;
  padding:0 0 14px;color:var(--text-primary);
}
table.compare th,table.compare td{padding:14px 16px;border-bottom:1px solid var(--border);text-align:center}
table.compare thead th{background:var(--bg-light);font-weight:600;color:var(--text-primary);white-space:nowrap}
table.compare th[scope="row"]{text-align:left;font-weight:500;color:var(--text-primary)}
table.compare tbody tr:last-child th,
table.compare tbody tr:last-child td{border-bottom:none}
table.compare .yes{color:var(--green);font-weight:700}
table.compare .no{color:var(--text-muted)}
table.compare td .plan-note{display:block;font-size:12px;color:var(--text-secondary)}

/* ---------- 14. 新闻资讯 ---------- */
.news-section{background:var(--bg-light)}
.news-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:var(--white);border-radius:var(--radius);overflow:hidden;
  border:1px solid var(--border);transition:all .3s;
  display:flex;flex-direction:column;
}
.news-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.news-card .news-img{
  height:160px;background:linear-gradient(135deg,var(--bg-dark),var(--deep-blue));
  display:flex;align-items:center;justify-content:center;font-size:48px;line-height:1;
}
.news-card .news-body{padding:20px}
.news-card .news-tag{
  display:inline-block;font-size:11px;padding:3px 10px;
  border-radius:12px;margin-bottom:10px;
}
.news-card .news-tag.update{background:rgba(37,99,235,.08);color:var(--primary)}
.news-card .news-tag.industry{background:rgba(6,182,212,.08);color:var(--cyan)}
.news-card .news-tag.tech{background:rgba(16,185,129,.08);color:var(--green)}
.news-card h3{font-size:16px;font-weight:600;margin-bottom:8px;line-height:1.55}
.news-card time{font-size:12px;color:var(--text-secondary)}

/* ---------- 15. 常见问题（原生 details，无 JS、可被 AI 抽取） ---------- */
.faq-section{background:var(--white)}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--border)}
.faq-item summary{
  padding:18px 0;cursor:pointer;display:flex;justify-content:space-between;
  align-items:flex-start;gap:16px;font-size:16px;font-weight:600;
  list-style:none;transition:color .3s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary:hover{color:var(--primary)}
.faq-item summary .faq-icon{font-size:20px;transition:transform .35s;flex:none;line-height:1.2}
.faq-item[open] summary .faq-icon{transform:rotate(45deg)}
.faq-answer{padding:0 0 20px;color:var(--text-secondary);font-size:15px;line-height:1.85}
.faq-answer p{margin-bottom:10px}
.faq-answer p:last-child{margin-bottom:0}
.faq-answer .lead{color:var(--text-primary);font-weight:600}
.faq-answer ol,.faq-answer ul{padding-left:22px;margin:8px 0}
.faq-answer li{margin-bottom:4px}

/* ---------- 16. 行动号召 ---------- */
.cta-section{
  background:linear-gradient(135deg,var(--bg-dark),var(--deep-blue));
  padding:80px 40px;text-align:center;
}
.cta-section h2{font-size:34px;color:var(--white);margin-bottom:12px;line-height:1.3}
.cta-section p{color:var(--text-muted);font-size:16px;margin-bottom:32px}
.cta-downloads{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.cta-btn{
  background:rgba(255,255,255,.1);color:#fff;padding:14px 28px;
  border-radius:var(--radius);text-decoration:none;font-weight:500;
  display:inline-flex;align-items:center;gap:8px;transition:all .3s;
  border:1px solid rgba(255,255,255,.15);
}
.cta-btn:hover{background:rgba(255,255,255,.2);transform:translateY(-2px)}
.cta-btn.primary{background:var(--primary);border-color:var(--primary)}
.cta-btn.primary:hover{background:var(--primary-dark)}
.cta-note{color:var(--text-muted);font-size:14px}
.cta-note a{color:var(--cyan)}

/* ---------- 17. 下载页 ---------- */
.download-section{padding:60px 40px;background:var(--white)}
.download-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.download-card{
  background:var(--white);border-radius:var(--radius-lg);padding:36px 28px;
  border:2px solid var(--border);text-align:center;transition:all .3s;
}
.download-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.download-card .dl-icon{font-size:48px;margin-bottom:16px;line-height:1}
.download-card h2{font-size:20px;font-weight:600;margin-bottom:8px}
.download-card .dl-ver{font-size:13px;color:var(--text-secondary);margin-bottom:6px}
.download-card .dl-size{font-size:13px;color:var(--text-secondary);margin-bottom:20px}
.download-card .dl-features{list-style:none;text-align:left;margin-bottom:24px}
.download-card .dl-features li{padding:4px 0;font-size:13px;color:var(--text-secondary)}
.download-card .dl-features li::before{content:'✓ ';color:var(--green);font-weight:700}
.dl-btn{
  display:inline-block;padding:14px 48px;background:var(--primary);color:#fff;
  border-radius:var(--radius);font-size:16px;font-weight:600;text-decoration:none;
  transition:all .3s;border:none;cursor:pointer;
}
.dl-btn:hover{background:var(--primary-dark);transform:scale(1.05);box-shadow:0 8px 30px rgba(37,99,235,.4)}
.dl-btn.secondary{background:transparent;color:var(--primary);border:2px solid var(--primary)}
.dl-btn.secondary:hover{background:var(--primary);color:#fff}
.dl-note{margin-top:10px;font-size:12px;color:var(--text-secondary)}

.qr-section{padding:40px 40px 60px;background:var(--bg-light);text-align:center}
.qr-section h2{font-size:24px;margin-bottom:20px}
.qr-box{
  display:inline-block;background:var(--white);padding:24px;
  border-radius:var(--radius-lg);border:1px solid var(--border);
}
.qr-box img{width:160px;height:160px;display:block;margin:0 auto 12px}
.qr-box p{font-size:14px;color:var(--text-secondary)}

.guide-section{padding:60px 40px;background:var(--white)}
.guide-steps{max-width:800px;margin:0 auto}
.guide-step{
  display:flex;gap:20px;margin-bottom:24px;padding:20px;
  background:var(--bg-light);border-radius:var(--radius);
}
.guide-step .step-num{
  width:40px;height:40px;background:var(--primary);color:#fff;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-weight:700;
  font-size:18px;flex:0 0 40px;
}
.guide-step h3{font-size:16px;margin-bottom:4px}
.guide-step p{font-size:14px;color:var(--text-secondary)}

/* ---------- 18. 网站地图页 ---------- */
.sitemap-section{padding:24px 40px 60px;max-width:1000px;margin:0 auto}
.sitemap-section h1{font-size:36px;font-weight:700;margin-bottom:8px}
.sitemap-section .subtitle{color:var(--text-secondary);margin-bottom:40px;font-size:16px}
.sitemap-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.sitemap-col{background:var(--white);border-radius:var(--radius);padding:28px;border:1px solid var(--border)}
.sitemap-col h2{
  font-size:18px;font-weight:600;margin-bottom:16px;padding-bottom:12px;
  border-bottom:2px solid var(--primary);color:var(--primary);
}
.sitemap-col ul{list-style:none}
.sitemap-col ul li a{
  color:var(--text-secondary);text-decoration:none;font-size:14px;
  transition:all .2s;display:block;padding:6px 0;
}
.sitemap-col ul li a:hover{color:var(--primary);padding-left:8px}
.sitemap-col ul li a::before{content:'› ';color:var(--primary);font-weight:700}

/* ---------- 19. 法务 / 合规文本页 ---------- */
.legal{max-width:820px;margin:0 auto;padding:24px 24px 60px}
.legal h1{font-size:34px;font-weight:700;margin-bottom:8px;line-height:1.3}
.legal .updated{color:var(--text-secondary);font-size:13px;margin-bottom:32px}
.legal h2{font-size:20px;font-weight:600;margin:32px 0 10px}
.legal p,.legal li{color:var(--text-secondary);line-height:1.9}
.legal p{margin-bottom:12px}
.legal ul,.legal ol{padding-left:22px;margin-bottom:12px}
.legal li{margin-bottom:6px}
.legal a{color:var(--primary)}
.legal .callout{
  background:var(--bg-light);border-left:4px solid var(--primary);
  border-radius:0 var(--radius) var(--radius) 0;padding:16px 20px;margin:20px 0;
}
.legal .callout p{margin-bottom:0;color:var(--text-primary)}

/* ---------- 20. 页脚 ---------- */
footer{background:var(--bg-dark);color:var(--text-muted);padding:60px 40px 30px}
.footer-grid{
  max-width:var(--maxw);margin:0 auto;display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:30px;margin-bottom:40px;
}
.footer-col h2,.footer-col h3{color:#fff;font-size:15px;margin-bottom:16px;font-weight:600}
.footer-col a{display:block;color:var(--text-muted);text-decoration:none;padding:4px 0;font-size:14px;transition:color .3s}
.footer-col a:hover{color:var(--primary)}
.footer-col .footer-brand{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.footer-col .footer-brand img{width:32px;height:32px;border-radius:6px}
.footer-col .footer-brand span{color:#fff;font-weight:700}
.footer-col .footer-desc{font-size:13px;line-height:1.8}
.footer-bottom{
  max-width:var(--maxw);margin:0 auto;padding-top:24px;
  border-top:1px solid rgba(255,255,255,.08);text-align:center;font-size:13px;
}
.footer-bottom a{color:var(--text-muted);text-decoration:none}
.footer-bottom a:hover{color:var(--primary)}
.footer-bottom .beian{margin-top:8px;font-size:12px}
.friend-links{max-width:var(--maxw);margin:20px auto 0;text-align:center;font-size:13px}
.friend-links a{color:var(--text-muted);text-decoration:none;margin:0 8px}
.friend-links a:hover{color:var(--primary)}

/* ---------- 21. 返回顶部 ---------- */
.back-top{
  position:fixed;bottom:30px;right:30px;width:44px;height:44px;border-radius:50%;
  background:var(--primary);color:#fff;border:none;cursor:pointer;font-size:20px;
  display:none;z-index:999;transition:all .3s;box-shadow:0 4px 15px rgba(37,99,235,.3);
}
.back-top:hover{transform:translateY(-3px)}
.back-top.show{display:flex;align-items:center;justify-content:center}

/* ---------- 22. 响应式 ---------- */
@media (max-width:1199px){
  .hero-content{flex-direction:column;text-align:center}
  .hero h1{font-size:38px}
  .hero p.subtitle{max-width:100%}
  .hero-tags,.hero-cta{justify-content:center}
  .hero-visual{width:100%}
  .vpn-simulator{max-width:100%;margin:0 auto}
  .stats-grid{grid-template-columns:repeat(3,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .tech-block,.tech-block:nth-child(even){flex-direction:column}
  .pricing-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .testimonial-grid,.scenario-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:767px){
  header{padding:0 20px}
  nav{
    display:none;position:fixed;top:0;right:0;bottom:0;width:270px;
    background:var(--white);flex-direction:column;padding:80px 30px 30px;
    gap:20px;box-shadow:-4px 0 20px rgba(0,0,0,.1);overflow-y:auto;align-items:flex-start;
  }
  nav.open{display:flex}
  nav a{color:var(--text-primary) !important}
  .hamburger{display:flex}
  .hero{padding:80px 20px 50px;min-height:auto}
  .hero h1{font-size:30px}
  .hero p.subtitle{font-size:17px}
  .sim-speed-display{font-size:52px}
  .section{padding:50px 20px}
  .section-header{margin-bottom:36px}
  .section-header h2{font-size:26px}
  .page-hero{padding:104px 20px 40px}
  .page-hero h1{font-size:28px}
  .page-hero p{font-size:15px}
  .breadcrumb{padding:88px 20px 0}
  .stats-section{padding:50px 20px}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid,.pricing-grid,.news-grid,.download-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  footer{padding:50px 20px 24px}
  .tech-text h3{font-size:22px}
  .tech-block{margin-bottom:56px;gap:32px}
  .cta-section{padding:56px 20px}
  .cta-section h2{font-size:24px}
  .download-section,.guide-section{padding:40px 20px}
  .download-card{padding:28px 20px}
  .dl-btn{width:100%;padding:14px 20px}
  .sitemap-section{padding:20px 20px 40px}
  .sitemap-section h1{font-size:28px}
  .legal{padding:20px 20px 40px}
  .legal h1{font-size:26px}
  .back-top{bottom:20px;right:20px}
}