/* ============================================================
   搜狗浏览器官网  ·  site.css
   自研无 CDN 依赖 · 语义化 CSS 变量 · 呼吸二维码框
   ============================================================ */
:root{
  --sg-blue:#0d5bd7;
  --sg-blue-d:#0844a0;
  --sg-cyan:#00b8e6;
  --sg-purple:#5b2dcb;
  --sg-green:#0bb26a;
  --sg-orange:#ff7c00;
  --sg-red:#e0362e;
  --sg-yellow:#f5a623;
  --sg-ink:#0f1a2b;
  --sg-ink-2:#1f2d44;
  --sg-gray:#5a6884;
  --sg-gray-2:#8896b0;
  --sg-line:#e4eaf4;
  --sg-line-2:#d5deee;
  --sg-bg:#ffffff;
  --sg-bg-2:#f6f9ff;
  --sg-bg-3:#eef4ff;
  --sg-hero-a:#0d5bd7;
  --sg-hero-b:#00b8e6;
  --sg-hero-c:#5b2dcb;
  --r:14px;
  --r-sm:8px;
  --r-lg:22px;
  --sh-1:0 2px 8px rgba(13,91,215,.08);
  --sh-2:0 6px 22px rgba(13,91,215,.14);
  --sh-3:0 14px 40px rgba(13,91,215,.22);
  --fs-h1:clamp(28px,4vw,44px);
  --fs-h2:clamp(22px,2.8vw,32px);
  --fs-h3:20px;
  --fs-body:15px;
  --fs-sm:13px;
  --maxw:1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans CN",system-ui,sans-serif;
  font-size:var(--fs-body);line-height:1.75;color:var(--sg-ink);background:var(--sg-bg);
  min-height:100vh;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;transition:color .2s}
a:hover{color:var(--sg-blue)}
ul,ol{list-style:none}
img{display:block;max-width:100%;height:auto}
button{font-family:inherit;cursor:pointer;border:none;background:none}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
@media (max-width:640px){.wrap{padding:0 16px}}

/* ================== 页头 ================== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--sg-line);
  transition:box-shadow .3s;
}
.site-header.scrolled{box-shadow:var(--sh-1)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-logo{width:38px;height:38px;border-radius:10px;overflow:hidden;box-shadow:0 4px 12px rgba(13,91,215,.28)}
.brand-name{font-size:18px;font-weight:700;color:var(--sg-ink);letter-spacing:.5px}
.brand-name em{color:var(--sg-blue);font-style:normal}
.brand-en{font-size:11px;color:var(--sg-gray-2);letter-spacing:1.5px;margin-left:6px;font-weight:400}
.main-nav{display:flex;gap:2px;flex:1;justify-content:center}
.main-nav a{
  padding:8px 14px;border-radius:8px;font-size:14px;color:var(--sg-ink-2);
  font-weight:500;transition:all .2s;position:relative;
}
.main-nav a:hover{background:var(--sg-bg-2);color:var(--sg-blue)}
.main-nav a.active{color:var(--sg-blue);font-weight:600}
.main-nav a.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:-2px;
  height:3px;background:linear-gradient(90deg,var(--sg-blue),var(--sg-cyan));
  border-radius:2px;
}
.header-cta{display:flex;gap:10px;align-items:center}

/* ================== 按钮 ================== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 22px;border-radius:10px;font-size:14px;font-weight:600;
  transition:all .25s;line-height:1.4;white-space:nowrap;
}
.btn-primary{
  background:linear-gradient(135deg,var(--sg-blue) 0%,var(--sg-cyan) 100%);
  color:#fff;box-shadow:0 6px 18px rgba(13,91,215,.32);
}
.btn-primary:hover{
  transform:translateY(-2px);box-shadow:0 10px 26px rgba(13,91,215,.42);
  background:linear-gradient(135deg,var(--sg-blue-d) 0%,#009dc7 100%);
}
.btn-ghost{
  background:rgba(255,255,255,.94);color:var(--sg-blue);
  border:1.5px solid rgba(255,255,255,.9);
}
.btn-ghost:hover{background:#fff;transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,.15)}
.btn-soft{
  background:var(--sg-bg-3);color:var(--sg-blue);
  border:1px solid var(--sg-line-2);
}
.btn-soft:hover{background:#fff;border-color:var(--sg-blue);color:var(--sg-blue)}
.btn-dark{background:var(--sg-ink);color:#fff}
.btn-dark:hover{background:var(--sg-ink-2)}
.btn-lg{padding:14px 30px;font-size:15px}
.btn-sm{padding:7px 14px;font-size:13px}
.btn svg,.btn .ic{width:16px;height:16px;flex-shrink:0}
.btn-block{width:100%}

/* ================== 导航栏 mobile ================== */
.menu-toggle{display:none;padding:8px;color:var(--sg-ink);background:none}
.menu-toggle svg{width:24px;height:24px}

/* ================== Hero ================== */
.hero{
  position:relative;overflow:hidden;
  background:linear-gradient(135deg,#0a1e4e 0%,#0d5bd7 40%,#00b8e6 80%,#5b2dcb 120%);
  color:#fff;padding:60px 0 80px;
}
.hero::before{
  content:"";position:absolute;top:-100px;right:-100px;width:600px;height:600px;
  background:radial-gradient(circle,rgba(0,184,230,.4) 0%,transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;bottom:-200px;left:-100px;width:500px;height:500px;
  background:radial-gradient(circle,rgba(91,45,203,.35) 0%,transparent 70%);
  pointer-events:none;
}
.hero-grid{
  display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center;
  position:relative;z-index:2;
}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:100px;
  background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);
  font-size:13px;backdrop-filter:blur(6px);margin-bottom:22px;
}
.hero-tag .dot{width:6px;height:6px;border-radius:50%;background:var(--sg-cyan);box-shadow:0 0 8px var(--sg-cyan);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.8)}}
.hero h1{
  font-size:var(--fs-h1);font-weight:800;letter-spacing:-.5px;
  line-height:1.15;margin-bottom:20px;text-shadow:0 4px 20px rgba(0,0,0,.15);
}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,#fff 0%,#a9e8ff 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{font-size:17px;line-height:1.7;color:rgba(255,255,255,.86);margin-bottom:32px;max-width:560px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:36px}
.hero-stats{
  display:flex;gap:36px;padding-top:28px;border-top:1px solid rgba(255,255,255,.18);
}
.hero-stat .num{font-size:32px;font-weight:800;line-height:1;color:#fff;margin-bottom:4px}
.hero-stat .num em{font-style:normal;font-size:16px;margin-left:2px;color:rgba(255,255,255,.7)}
.hero-stat .lbl{font-size:13px;color:rgba(255,255,255,.72);letter-spacing:.5px}

/* Hero 右侧截图卡 */
.hero-shot{position:relative}
.hero-shot-frame{
  position:relative;border-radius:18px;overflow:hidden;
  box-shadow:0 24px 60px rgba(0,20,80,.4),0 0 0 8px rgba(255,255,255,.08);
  transform:perspective(1400px) rotateY(-4deg) rotateX(2deg);
  transition:transform .5s ease;
}
.hero-shot:hover .hero-shot-frame{transform:perspective(1400px) rotateY(-1deg) rotateX(1deg)}
.hero-shot-frame img{width:100%;aspect-ratio:16/10;object-fit:cover;background:#001238}
.hero-shot-glow{
  position:absolute;inset:-30px;border-radius:32px;
  background:radial-gradient(ellipse,rgba(0,184,230,.5) 0%,transparent 60%);
  filter:blur(30px);z-index:-1;opacity:.7;
}
.hero-shot-badge{
  position:absolute;bottom:-20px;left:-20px;
  background:#fff;border-radius:14px;padding:12px 16px;
  box-shadow:0 12px 32px rgba(0,0,0,.2);
  display:flex;align-items:center;gap:10px;
  animation:float 4s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.hero-shot-badge .ic-wrap{
  width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,var(--sg-green),#4cd690);
  display:flex;align-items:center;justify-content:center;color:#fff;
}
.hero-shot-badge .ic-wrap svg{width:20px;height:20px}
.hero-shot-badge .txt{font-size:13px;color:var(--sg-ink)}
.hero-shot-badge .txt strong{display:block;font-size:14px;font-weight:700}

/* ================== 通栏特性 ================== */
.marquee{
  background:var(--sg-bg-2);border-bottom:1px solid var(--sg-line);
  padding:14px 0;overflow:hidden;
}
.marquee-track{
  display:flex;gap:60px;white-space:nowrap;
  animation:scroll 40s linear infinite;
}
.marquee-track:hover{animation-play-state:paused}
@keyframes scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.marquee-item{
  display:inline-flex;align-items:center;gap:10px;
  font-size:14px;color:var(--sg-ink-2);font-weight:500;
}
.marquee-item .ic{width:20px;height:20px;color:var(--sg-blue)}

/* ================== Section ================== */
.section{padding:80px 0}
.section-tight{padding:56px 0}
.section-alt{background:var(--sg-bg-2)}
.section-dark{
  background:linear-gradient(135deg,#0a1e4e 0%,#0d5bd7 60%,#00b8e6 100%);
  color:#fff;
}
.section-head{margin-bottom:48px;max-width:720px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px;border-radius:100px;
  background:var(--sg-bg-3);color:var(--sg-blue);
  font-size:12px;font-weight:600;letter-spacing:.8px;
  margin-bottom:14px;
}
.section-dark .eyebrow{background:rgba(255,255,255,.14);color:#a9e8ff}
.section-title{
  font-size:var(--fs-h2);font-weight:800;color:var(--sg-ink);
  line-height:1.3;margin-bottom:14px;
}
.section-dark .section-title{color:#fff}
.section-desc{font-size:16px;color:var(--sg-gray);line-height:1.75}
.section-dark .section-desc{color:rgba(255,255,255,.78)}

/* ================== 特性网格 ================== */
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-grid.f-2{grid-template-columns:repeat(2,1fr)}
.feature-grid.f-4{grid-template-columns:repeat(4,1fr)}
.feature-card{
  background:#fff;border-radius:var(--r);padding:28px;
  border:1px solid var(--sg-line);
  transition:all .3s;position:relative;overflow:hidden;
}
.feature-card::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--sg-blue),var(--sg-cyan));
  transform:scaleX(0);transform-origin:left;transition:transform .3s;
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:rgba(13,91,215,.28)}
.feature-card:hover::before{transform:scaleX(1)}
.feature-ic{
  width:52px;height:52px;border-radius:14px;
  background:linear-gradient(135deg,var(--sg-bg-3),#dbe7ff);
  display:flex;align-items:center;justify-content:center;
  color:var(--sg-blue);margin-bottom:20px;
}
.feature-ic svg{width:28px;height:28px}
.feature-card h3{font-size:18px;font-weight:700;margin-bottom:10px;color:var(--sg-ink)}
.feature-card p{font-size:14px;color:var(--sg-gray);line-height:1.7}
.feature-card .tag{
  display:inline-block;padding:3px 10px;border-radius:100px;
  background:var(--sg-bg-3);color:var(--sg-blue);font-size:11px;font-weight:600;
  margin-top:14px;letter-spacing:.5px;
}

/* ================== 大特性卡（带截图） ================== */
.feature-xl{
  display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;
  padding:24px 0;
}
.feature-xl.reverse{grid-template-columns:1fr 1fr}
.feature-xl .txt h3{font-size:26px;font-weight:800;margin-bottom:16px;color:var(--sg-ink)}
.feature-xl .txt p{font-size:15px;color:var(--sg-gray);margin-bottom:24px;line-height:1.75}
.feature-xl .txt ul{display:flex;flex-direction:column;gap:12px;margin-bottom:28px}
.feature-xl .txt ul li{
  display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--sg-ink-2);
}
.feature-xl .txt ul li::before{
  content:"";width:18px;height:18px;border-radius:50%;
  background:linear-gradient(135deg,var(--sg-green),#4cd690);
  flex-shrink:0;margin-top:3px;
  background-image:linear-gradient(135deg,var(--sg-green),#4cd690),
    linear-gradient(45deg,transparent 40%,#fff 40%,#fff 60%,transparent 60%),
    linear-gradient(-45deg,transparent 40%,#fff 40%,#fff 60%,transparent 60%);
  background-size:100% 100%,100% 100%,100% 100%;
}
.feature-xl .txt ul li::before{
  background:linear-gradient(135deg,var(--sg-green),#4cd690);
  position:relative;
  -webkit-mask:linear-gradient(45deg,transparent 42%,#000 42%,#000 58%,transparent 58%) 100% 100%/6px 6px no-repeat,
              linear-gradient(-45deg,transparent 42%,#000 42%,#000 58%,transparent 58%) 0 60%/8px 8px no-repeat,
              radial-gradient(circle,transparent 60%,#000 61%);
}
.feature-xl .shot{
  position:relative;border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-2);border:1px solid var(--sg-line);
}
.feature-xl .shot img{width:100%;aspect-ratio:16/11;object-fit:cover;background:#0a1e4e}
.feature-xl .shot-badge{
  position:absolute;top:16px;left:16px;padding:6px 12px;border-radius:100px;
  background:rgba(13,91,215,.9);color:#fff;font-size:12px;font-weight:600;
  backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.3);
}

/* ================== 步骤 ================== */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;position:relative}
.step-card{
  background:#fff;padding:28px 24px;border-radius:var(--r);
  border:1px solid var(--sg-line);position:relative;
  transition:all .3s;
}
.step-card:hover{box-shadow:var(--sh-2);transform:translateY(-3px);border-color:var(--sg-blue)}
.step-num{
  position:absolute;top:-16px;left:24px;
  width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,var(--sg-blue),var(--sg-cyan));
  color:#fff;display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:700;
  box-shadow:0 6px 16px rgba(13,91,215,.35);
}
.step-card h4{font-size:16px;font-weight:700;margin:16px 0 10px;color:var(--sg-ink)}
.step-card p{font-size:13px;color:var(--sg-gray);line-height:1.65}
.step-card .ic{
  width:44px;height:44px;border-radius:12px;
  background:var(--sg-bg-3);display:flex;align-items:center;justify-content:center;
  color:var(--sg-blue);margin-top:12px;
}
.step-card .ic svg{width:24px;height:24px}

/* ================== 下载模块 ================== */
.download-panel{
  background:linear-gradient(135deg,#0d5bd7 0%,#00b8e6 60%,#5b2dcb 100%);
  border-radius:var(--r-lg);padding:48px;color:#fff;
  display:grid;grid-template-columns:1.15fr 1fr;gap:44px;align-items:center;
  box-shadow:0 20px 60px rgba(13,91,215,.35);
  position:relative;overflow:hidden;
}
.download-panel::before{
  content:"";position:absolute;top:-50%;right:-30%;width:60%;height:200%;
  background:radial-gradient(ellipse,rgba(255,255,255,.15) 0%,transparent 60%);
  pointer-events:none;
}
.download-info{position:relative;z-index:2}
.download-info .badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:100px;
  background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.3);
  font-size:12px;margin-bottom:16px;
}
.download-info h2{font-size:32px;font-weight:800;margin-bottom:12px;line-height:1.2}
.download-info .sub{color:rgba(255,255,255,.86);font-size:15px;margin-bottom:26px}
.download-info ul{display:flex;flex-direction:column;gap:12px;margin-bottom:28px}
.download-info ul li{
  display:flex;align-items:center;gap:10px;
  font-size:14px;color:rgba(255,255,255,.94);
}
.download-info ul li .check{
  width:22px;height:22px;border-radius:50%;
  background:rgba(255,255,255,.2);color:#fff;
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.download-info ul li .check svg{width:12px;height:12px}
.download-btns{display:flex;gap:12px;flex-wrap:wrap}
.dl-btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 22px;border-radius:12px;font-size:15px;font-weight:700;
  transition:all .25s;line-height:1.2;
}
.dl-btn-primary{background:#fff;color:var(--sg-blue)}
.dl-btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,0,0,.25)}
.dl-btn-secondary{background:rgba(255,255,255,.16);color:#fff;border:1.5px solid rgba(255,255,255,.4)}
.dl-btn-secondary:hover{background:rgba(255,255,255,.24);transform:translateY(-2px)}
.dl-btn svg{width:20px;height:20px}
.download-qr{
  position:relative;z-index:2;
  background:#fff;border-radius:var(--r-lg);padding:24px;
  text-align:center;color:var(--sg-ink);
  box-shadow:0 20px 40px rgba(0,0,0,.2);
}
.download-qr .qr-title{font-size:15px;font-weight:700;margin-bottom:6px}
.download-qr .qr-hint{font-size:12px;color:var(--sg-gray);margin-bottom:16px}

/* ================== 二维码呼吸框 ================== */
.qr-breath{
  padding:14px;border-radius:18px;
  background:#fff;position:relative;
  animation:qrBreath 3.2s ease-in-out infinite;
  margin:0 auto;max-width:230px;
}
@keyframes qrBreath{
  0%,100%{
    box-shadow:0 0 0 2px rgba(13,91,215,.5),0 0 0 6px rgba(13,91,215,.18),0 12px 28px rgba(13,91,215,.25);
    border:2px solid rgba(13,91,215,.5);
  }
  50%{
    box-shadow:0 0 0 2px rgba(13,91,215,.85),0 0 0 10px rgba(13,91,215,.08),0 18px 40px rgba(13,91,215,.4);
    border:2px solid rgba(13,91,215,.85);
  }
}
.qr-breath.baidu{
  animation-name:qrBreathBaidu;
}
@keyframes qrBreathBaidu{
  0%,100%{
    box-shadow:0 0 0 2px rgba(22,93,236,.5),0 0 0 6px rgba(22,93,236,.18),0 12px 28px rgba(22,93,236,.25);
    border:2px solid rgba(22,93,236,.5);
  }
  50%{
    box-shadow:0 0 0 2px rgba(22,93,236,.85),0 0 0 10px rgba(22,93,236,.08),0 18px 40px rgba(22,93,236,.4);
    border:2px solid rgba(22,93,236,.85);
  }
}
.qr-breath img{width:100%;height:auto;border-radius:12px;display:block}

/* ================== 平台卡 ================== */
.platform-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.platform-card{
  background:#fff;border:1px solid var(--sg-line);border-radius:var(--r);
  padding:26px;text-align:center;transition:all .3s;
}
.platform-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:var(--sg-blue)}
.platform-ic{
  width:64px;height:64px;border-radius:18px;
  background:linear-gradient(135deg,var(--sg-bg-3),#dbe7ff);
  display:flex;align-items:center;justify-content:center;color:var(--sg-blue);
  margin:0 auto 16px;
}
.platform-ic svg{width:36px;height:36px}
.platform-card h4{font-size:16px;font-weight:700;margin-bottom:6px}
.platform-card .ver{font-size:12px;color:var(--sg-gray-2);margin-bottom:14px}
.platform-card .btn{width:100%}

/* ================== 时间线 / 新闻 ================== */
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.news-card{
  background:#fff;border:1px solid var(--sg-line);border-radius:var(--r);
  overflow:hidden;transition:all .3s;display:flex;flex-direction:column;
}
.news-card:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:var(--sg-blue)}
.news-card .cat{
  padding:8px 14px;font-size:12px;font-weight:600;letter-spacing:.5px;
  background:linear-gradient(90deg,var(--sg-bg-3),#dbe7ff);color:var(--sg-blue);
}
.news-card .body{padding:20px;flex:1;display:flex;flex-direction:column}
.news-card .date{font-size:12px;color:var(--sg-gray-2);margin-bottom:8px;letter-spacing:.5px}
.news-card h3{font-size:16px;font-weight:700;line-height:1.45;margin-bottom:10px;color:var(--sg-ink)}
.news-card p{font-size:13px;color:var(--sg-gray);line-height:1.7;flex:1}
.news-card .more{margin-top:16px;font-size:13px;color:var(--sg-blue);font-weight:600;display:inline-flex;align-items:center;gap:4px}
.news-card .more svg{width:14px;height:14px;transition:transform .2s}
.news-card:hover .more svg{transform:translateX(3px)}

/* ================== FAQ ================== */
.faq-list{max-width:820px;margin:0 auto}
.faq-item{
  background:#fff;border:1px solid var(--sg-line);border-radius:var(--r);
  margin-bottom:12px;overflow:hidden;transition:all .25s;
}
.faq-item.open{border-color:var(--sg-blue);box-shadow:var(--sh-1)}
.faq-q{
  display:flex;justify-content:space-between;align-items:center;
  padding:20px 24px;cursor:pointer;gap:16px;
  font-size:15px;font-weight:600;color:var(--sg-ink);
}
.faq-q .idx{
  width:24px;height:24px;border-radius:6px;background:var(--sg-bg-3);
  color:var(--sg-blue);display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;flex-shrink:0;margin-right:4px;
}
.faq-q .title{flex:1;display:flex;align-items:center;gap:12px}
.faq-q .arrow{width:20px;height:20px;color:var(--sg-gray);transition:transform .3s;flex-shrink:0}
.faq-item.open .faq-q .arrow{transform:rotate(180deg);color:var(--sg-blue)}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .35s ease;
  padding:0 24px;
}
.faq-item.open .faq-a{max-height:400px;padding:0 24px 22px 60px}
.faq-a p{font-size:14px;color:var(--sg-gray);line-height:1.8}
.faq-a p + p{margin-top:10px}

/* ================== CTA 大区块 ================== */
.cta-block{
  background:linear-gradient(135deg,#0a1e4e 0%,#0d5bd7 50%,#00b8e6 100%);
  border-radius:var(--r-lg);padding:56px 48px;
  color:#fff;text-align:center;position:relative;overflow:hidden;
}
.cta-block::before{
  content:"";position:absolute;top:-50%;left:20%;width:60%;height:200%;
  background:radial-gradient(ellipse,rgba(0,184,230,.4) 0%,transparent 60%);
}
.cta-block h2{font-size:32px;font-weight:800;margin-bottom:14px;position:relative}
.cta-block p{font-size:16px;color:rgba(255,255,255,.86);margin-bottom:30px;position:relative}
.cta-block .btns{display:flex;gap:14px;justify-content:center;position:relative;flex-wrap:wrap}

/* ================== 时效/提示条 ================== */
.notice-bar{
  display:flex;align-items:flex-start;gap:12px;
  padding:14px 18px;border-radius:12px;
  background:#fff8e8;border:1px solid #f0c674;color:#7a5113;
  font-size:13px;line-height:1.65;
}
.notice-bar .ic{width:20px;height:20px;flex-shrink:0;margin-top:1px}
.notice-bar.urgent{background:#fff0ee;border-color:#f0a39a;color:#8b1e15}
.notice-bar.info{background:var(--sg-bg-3);border-color:#c1d6ff;color:var(--sg-blue)}

/* ================== 页脚 ================== */
.site-footer{
  background:linear-gradient(180deg,#0f1a2b 0%,#1a2740 100%);
  color:rgba(255,255,255,.72);padding:60px 0 24px;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:36px;margin-bottom:40px}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.footer-brand .brand-name{color:#fff;font-size:20px}
.footer-brand .brand-desc{font-size:13px;line-height:1.7;color:rgba(255,255,255,.6)}
/* 页脚 logo（使用用户提供的 logo.png；深色底上通过亮度+对比度滤镜让深蓝字可读） */
.footer-brand .footer-logo{height:54px;width:auto;display:block;opacity:.95;transition:opacity .3s,filter .3s;filter:brightness(1.35) contrast(1.05) saturate(1.05)}
.footer-brand .footer-logo:hover{opacity:1;filter:brightness(1.5) contrast(1.1) saturate(1.1)}
.footer-col h5{
  font-size:14px;color:#fff;font-weight:700;margin-bottom:14px;letter-spacing:.5px;
}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:13px;color:rgba(255,255,255,.6);transition:color .2s}
.footer-col ul li a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding-top:22px;
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  font-size:12px;color:rgba(255,255,255,.5);
}
.footer-bottom .disclaimer{max-width:60%;line-height:1.6}

/* ================== Breadcrumb ================== */
.breadcrumb{
  padding:14px 0;font-size:13px;color:var(--sg-gray);
  border-bottom:1px solid var(--sg-line);background:#fff;
}
.breadcrumb .wrap{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.breadcrumb a{color:var(--sg-gray)}
.breadcrumb a:hover{color:var(--sg-blue)}
.breadcrumb .sep{color:var(--sg-gray-2)}
.breadcrumb .current{color:var(--sg-blue);font-weight:500}

/* ================== 页面头（非首页） ================== */
.page-hero{
  background:linear-gradient(135deg,#0d5bd7 0%,#00b8e6 100%);
  padding:44px 0 36px;color:#fff;position:relative;overflow:hidden;
}
.page-hero::before{
  content:"";position:absolute;top:-60%;right:-10%;width:60%;height:220%;
  background:radial-gradient(ellipse,rgba(0,184,230,.4) 0%,transparent 60%);
}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{font-size:32px;font-weight:800;margin-bottom:10px}
.page-hero p{font-size:15px;color:rgba(255,255,255,.85);max-width:640px}

/* ================== 关于 ================== */
.about-hero{
  display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;
  padding:20px 0;
}
.about-hero .txt h2{font-size:34px;font-weight:800;margin-bottom:16px;color:var(--sg-ink)}
.about-hero .txt p{font-size:15px;color:var(--sg-gray);margin-bottom:18px;line-height:1.8}
.about-hero .txt p strong{color:var(--sg-ink)}
.about-hero .quote{
  background:linear-gradient(135deg,var(--sg-bg-3),#dbe7ff);
  padding:22px 24px;border-radius:var(--r);border-left:4px solid var(--sg-blue);
  margin:24px 0;font-size:15px;color:var(--sg-ink);line-height:1.7;font-weight:500;
}
.about-hero .shot{
  border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-2);
  border:1px solid var(--sg-line);
}
.about-hero .shot img{width:100%;aspect-ratio:4/3;object-fit:cover;background:#0a1e4e}

/* Timeline */
.timeline{position:relative;padding:20px 0;max-width:780px;margin:0 auto}
.timeline::before{
  content:"";position:absolute;left:20px;top:20px;bottom:20px;
  width:2px;background:linear-gradient(180deg,var(--sg-blue) 0%,var(--sg-cyan) 100%);
}
.timeline-item{
  position:relative;padding:20px 0 20px 60px;
}
.timeline-item::before{
  content:"";position:absolute;left:14px;top:24px;width:14px;height:14px;
  border-radius:50%;background:var(--sg-blue);
  box-shadow:0 0 0 4px var(--sg-bg-2),0 0 0 6px var(--sg-blue);
}
.timeline-item .year{font-size:13px;color:var(--sg-blue);font-weight:700;margin-bottom:6px;letter-spacing:.5px}
.timeline-item h4{font-size:17px;font-weight:700;margin-bottom:8px;color:var(--sg-ink)}
.timeline-item p{font-size:14px;color:var(--sg-gray);line-height:1.7}

/* Team values */
.values-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:36px}
.value-card{
  background:#fff;border:1px solid var(--sg-line);border-radius:var(--r);
  padding:24px;transition:all .3s;
}
.value-card:hover{transform:translateY(-3px);box-shadow:var(--sh-1)}
.value-card .num{font-size:36px;font-weight:800;color:var(--sg-blue);line-height:1;margin-bottom:8px}
.value-card .lbl{font-size:15px;font-weight:700;color:var(--sg-ink);margin-bottom:8px}
.value-card .desc{font-size:13px;color:var(--sg-gray);line-height:1.65}

/* ================== 联系 ================== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px}
.contact-card{
  background:#fff;border:1px solid var(--sg-line);border-radius:var(--r);
  padding:32px;transition:all .3s;
}
.contact-card:hover{border-color:var(--sg-blue);box-shadow:var(--sh-1)}
.contact-card .ic-wrap{
  width:52px;height:52px;border-radius:14px;
  background:linear-gradient(135deg,var(--sg-blue),var(--sg-cyan));
  display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:18px;
}
.contact-card .ic-wrap svg{width:26px;height:26px}
.contact-card h3{font-size:18px;font-weight:700;margin-bottom:8px}
.contact-card .val{font-size:16px;color:var(--sg-ink);font-weight:600;margin-bottom:8px;word-break:break-all}
.contact-card .desc{font-size:13px;color:var(--sg-gray);line-height:1.65}

/* ================== Toast ================== */
.toast{
  position:fixed;left:50%;bottom:32px;transform:translate(-50%,20px);
  padding:14px 22px;border-radius:12px;background:var(--sg-ink);color:#fff;
  font-size:14px;box-shadow:var(--sh-3);opacity:0;pointer-events:none;
  transition:all .3s;z-index:9999;display:flex;align-items:center;gap:8px;
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.toast.success{background:var(--sg-green)}
.toast .ic{width:18px;height:18px}

/* ================== Modal ================== */
.modal-overlay{
  position:fixed;inset:0;background:rgba(15,26,43,.72);
  display:none;align-items:center;justify-content:center;
  z-index:1000;padding:20px;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
}
.modal-overlay.show{display:flex;animation:fadeIn .3s ease}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.modal{
  background:#fff;border-radius:20px;padding:36px;
  max-width:440px;width:100%;text-align:center;position:relative;
  animation:slideIn .35s cubic-bezier(.2,.9,.4,1);
}
@keyframes slideIn{from{opacity:0;transform:translateY(24px) scale(.96)}to{opacity:1;transform:none}}
.modal-close{
  position:absolute;top:16px;right:16px;
  width:32px;height:32px;border-radius:50%;
  background:var(--sg-bg-2);color:var(--sg-gray);
  display:flex;align-items:center;justify-content:center;transition:all .2s;
}
.modal-close:hover{background:var(--sg-red);color:#fff}
.modal-close svg{width:16px;height:16px}
.modal-badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 14px;border-radius:100px;
  background:linear-gradient(90deg,var(--sg-bg-3),#dbe7ff);color:var(--sg-blue);
  font-size:12px;font-weight:700;margin-bottom:14px;letter-spacing:.5px;
}
.modal-badge.green{background:linear-gradient(90deg,#e3f8ec,#c1f0d0);color:var(--sg-green)}
.modal-badge.baidu{background:linear-gradient(90deg,#e7f0ff,#c1d6ff);color:#165dec}
.modal h3{font-size:22px;font-weight:800;margin-bottom:6px;color:var(--sg-ink)}
.modal .sub{font-size:14px;color:var(--sg-gray);margin-bottom:20px}
.modal .qr-wrap{margin-bottom:20px}
.modal .qr-note{font-size:14px;color:var(--sg-ink);margin-bottom:12px;font-weight:600}
.modal .qr-note .brand{color:var(--sg-blue);font-weight:700}
.modal .qr-note.baidu .brand{color:#165dec}
.modal .qr-urgent{
  background:#fff8e8;border:1px solid #f0c674;
  padding:12px 14px;border-radius:10px;
  color:#7a5113;font-size:12px;line-height:1.6;margin-bottom:16px;
  display:flex;gap:8px;align-items:flex-start;
}
.modal .qr-urgent .ic{width:16px;height:16px;flex-shrink:0;margin-top:1px;color:#f5a623}
.modal .qr-urgent strong{color:#c43200;font-weight:700}
.modal .qr-mobile-hide{display:none}
.modal .footer-brand-info{
  margin-top:16px;padding-top:16px;border-top:1px dashed var(--sg-line);
  font-size:12px;color:var(--sg-gray-2);line-height:1.6;
}

/* ================== Reveal 动画（仅当 JS 加载后隐藏，避免脚本失败导致内容不可见） ================== */
html.js-loading .reveal{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
html.js-loading .reveal.in{opacity:1;transform:none}

/* ================== 工具 ================== */
.gap-2{gap:8px}.gap-3{gap:12px}.gap-4{gap:16px}.gap-6{gap:24px}
.mt-2{margin-top:8px}.mt-4{margin-top:16px}.mt-6{margin-top:24px}.mt-8{margin-top:32px}
.mb-2{margin-bottom:8px}.mb-4{margin-bottom:16px}.mb-6{margin-bottom:24px}
.flex{display:flex}.items-center{align-items:center}.justify-between{justify-content:space-between}
.gap-a{display:grid;grid-auto-flow:column}
.text-center{text-align:center}.text-sm{font-size:13px}.text-gray{color:var(--sg-gray)}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}

/* ================== 响应式 ================== */
@media (max-width:960px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .hero-shot{order:-1;max-width:560px}
  .hero-shot-frame{transform:none}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .feature-xl{grid-template-columns:1fr;gap:24px}
  .download-panel{grid-template-columns:1fr;gap:32px;padding:36px 28px}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .about-hero{grid-template-columns:1fr;gap:24px}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .values-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);gap:24px 12px}
}
@media (max-width:640px){
  .site-header .main-nav{display:none}
  .menu-toggle{display:block}
  .main-nav.open{
    display:flex;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;background:#fff;padding:12px 16px;gap:4px;
    border-bottom:1px solid var(--sg-line);box-shadow:var(--sh-2);
  }
  .main-nav.open a{padding:12px 16px;font-size:15px}
  .main-nav.open a.active::after{display:none}
  .header-cta .btn:not(.btn-sm){display:none}
  .hero{padding:44px 0 60px}
  .hero h1{font-size:32px}
  .hero-stats{gap:20px}
  .hero-stat .num{font-size:26px}
  .section{padding:56px 0}
  .section-head{margin-bottom:32px}
  .feature-grid,.feature-grid.f-2,.feature-grid.f-4,.platform-grid,.news-grid,.steps,.values-grid{grid-template-columns:1fr}
  .feature-xl{gap:20px}
  .download-panel{padding:32px 20px}
  .download-panel h2{font-size:24px}
  .download-info ul li{font-size:13px}
  .download-btns .dl-btn{flex:1}
  .cta-block{padding:36px 20px}
  .cta-block h2{font-size:24px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-bottom .disclaimer{max-width:100%}
  .breadcrumb{font-size:12px}
}