*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --red:#e2231a;--red-dark:#c41d15;--red-light:#fff0ef;
  --blue:#1a56db;--blue-light:#eff6ff;
  --text:#222;--muted:#666;--line:#e8e8e8;
  --bg:#fff;--bg2:#f7f8fa;
  --shadow:0 8px 30px rgba(0,0,0,.08);
  --r:10px;--w:1180px;
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);line-height:1.75;background:var(--bg)}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--red)}
img{display:block;max-width:100%}
.wrap{max-width:var(--w);margin:0 auto;padding:0 20px}

/* header */
.header{position:sticky;top:0;z-index:200;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(0,0,0,.04)}
.header-inner{display:flex;align-items:center;height:64px;gap:28px}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:18px;flex-shrink:0}
.brand img{width:32px;height:32px;border-radius:6px;object-fit:contain;flex-shrink:0}
.nav{display:flex;gap:28px;margin-left:auto}
.nav a{color:var(--muted);font-size:15px;font-weight:500;padding:4px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a.on{color:var(--red);border-bottom-color:var(--red)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);margin:5px 0;transition:.3s}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;border-radius:6px;font-size:15px;font-weight:600;border:none;cursor:pointer;transition:.2s}
.btn-red{background:var(--red);color:#fff}
.btn-red:hover{background:var(--red-dark);color:#fff;transform:translateY(-1px);box-shadow:0 6px 20px rgba(226,35,26,.35)}
.btn-outline{background:#fff;color:var(--red);border:2px solid var(--red)}
.btn-outline:hover{background:var(--red-light)}
.btn-sm{padding:8px 20px;font-size:14px}
.btn-lg{padding:14px 36px;font-size:16px}

/* hero */
.hero{background:linear-gradient(160deg,#fff5f5 0%,#fff 45%,#f0f6ff 100%);padding:72px 0 88px;text-align:center}
.hero-tag{display:inline-block;background:var(--red-light);color:var(--red);font-size:13px;font-weight:600;padding:5px 14px;border-radius:20px;margin-bottom:18px}
.hero h1{font-size:42px;line-height:1.25;font-weight:800;margin-bottom:18px;color:#111}
.hero p{font-size:18px;color:var(--muted);max-width:680px;margin:0 auto 32px}
.hero-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* sections */
.sec{padding:72px 0}
.sec-gray{background:var(--bg2)}
.sec-head{text-align:center;margin-bottom:48px}
.sec-head h2{font-size:32px;font-weight:700;margin-bottom:10px}
.sec-head p{color:var(--muted);font-size:16px}

/* cards 3col */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:32px 26px;transition:.25s}
.card:hover{box-shadow:var(--shadow);transform:translateY(-3px);border-color:#ffd0cd}
.card-ico{width:52px;height:52px;border-radius:12px;background:var(--red-light);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:18px}
.card h3{font-size:18px;margin-bottom:10px}
.card p{color:var(--muted);font-size:14px;line-height:1.8}

/* reviews */
.review{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 24px;height:100%}
.review q{display:block;color:var(--muted);font-size:14px;line-height:1.85;margin-bottom:16px;font-style:normal}
.review q::before{content:"\201C";color:var(--red);font-size:28px;line-height:0;vertical-align:-8px;margin-right:4px}
.review cite{display:block;font-style:normal;font-weight:600;font-size:14px}
.review span{display:block;color:var(--muted);font-size:13px;margin-top:2px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;text-align:center}
.stat{padding:28px 12px}
.stat b{display:block;font-size:38px;font-weight:800;color:var(--red);line-height:1.1;margin-bottom:6px}
.stat span{color:var(--muted);font-size:14px}

/* faq */
.faq{max-width:860px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:var(--r);margin-bottom:10px;background:#fff;overflow:hidden}
.faq-q{width:100%;text-align:left;padding:18px 22px;background:none;border:none;font-size:15px;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-family:inherit;color:var(--text)}
.faq-q:hover{background:var(--bg2)}
.faq-q i{font-style:normal;color:var(--red);font-size:20px;transition:.25s}
.faq-item.open .faq-q i{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s}
.faq-a div{padding:0 22px 18px;color:var(--muted);font-size:14px;line-height:1.85}

/* cta */
.cta{background:linear-gradient(135deg,var(--red),#ff5a4f);color:#fff;text-align:center;padding:56px 24px;border-radius:var(--r)}
.cta h2{font-size:28px;margin-bottom:10px}
.cta p{opacity:.92;margin-bottom:24px;font-size:16px}
.cta .btn-red{background:#fff;color:var(--red)}
.cta .btn-red:hover{background:#f5f5f5}

/* download */
.dl-hero{padding:56px 0 40px;text-align:center;background:linear-gradient(160deg,#fff5f5,#fff)}
.dl-hero h1{font-size:34px;margin-bottom:12px}
.dl-hero p{color:var(--muted);font-size:16px}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:40px}
.dl-card{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:36px 24px;text-align:center;transition:.25s}
.dl-card:hover{border-color:var(--red);box-shadow:var(--shadow)}
.dl-card .ico{font-size:42px;margin-bottom:14px}
.dl-card h3{margin-bottom:6px;font-size:17px}
.dl-card p{color:var(--muted);font-size:13px;margin-bottom:20px;min-height:40px}
.dl-steps{max-width:720px;margin:48px auto 0;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:28px 32px}
.dl-steps h3{text-align:center;margin-bottom:16px;font-size:18px}
.dl-steps ol{padding-left:20px;color:var(--muted);font-size:14px}
.dl-steps li{margin-bottom:10px}

/* articles */
.art-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.art-card{border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:#fff;transition:.25s}
.art-card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}
.art-body{padding:22px}
.art-meta{font-size:12px;color:var(--muted);margin-bottom:8px}
.art-body h3{font-size:16px;line-height:1.45;margin-bottom:8px}
.art-body h3 a{color:var(--text)}
.art-body h3 a:hover{color:var(--red)}
.art-body p{font-size:13px;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* article detail */
.bread{padding:16px 0;font-size:13px;color:var(--muted)}
.bread a{color:var(--muted)}
.art-detail{max-width:820px;margin:0 auto;padding:20px 0 72px}
.art-detail h1{font-size:30px;line-height:1.35;margin-bottom:14px}
.art-info{font-size:13px;color:var(--muted);padding-bottom:22px;margin-bottom:28px;border-bottom:1px solid var(--line)}
.art-content h2{font-size:22px;margin:28px 0 12px}
.art-content h3{font-size:17px;margin:20px 0 10px}
.art-content p{color:var(--muted);margin-bottom:14px;font-size:15px;line-height:1.85}
.art-content ul,.art-content ol{margin:12px 0 16px 22px;color:var(--muted);font-size:15px}
.art-content li{margin-bottom:6px}
.art-foot{margin-top:40px;padding-top:28px;border-top:1px solid var(--line);text-align:center}
.art-foot p{color:var(--muted);margin-bottom:16px;font-size:14px}

/* sitemap */
.map-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.map-box{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:24px 28px}
.map-box h3{font-size:17px;margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.map-box ul{list-style:none}
.map-box li{margin-bottom:8px}
.map-box a{font-size:14px;color:var(--muted)}
.map-box a:hover{color:var(--red)}

/* footer */
.footer{background:#1a1a2e;color:#aaa;padding:56px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:36px;padding-bottom:40px}
.footer-brand strong{display:block;color:#fff;font-size:16px;margin-bottom:10px}
.footer-brand p{font-size:13px;line-height:1.8}
.footer h4{color:#fff;font-size:14px;margin-bottom:14px}
.footer ul{list-style:none}
.footer li{margin-bottom:7px;font-size:13px}
.footer a{color:#aaa}
.footer a:hover{color:#fff}
.footer-copy{border-top:1px solid #2d2d44;padding:18px 0;text-align:center;font-size:12px}

@media(max-width:960px){
  .grid3,.dl-grid,.art-grid,.stats{grid-template-columns:repeat(2,1fr)}
  .footer-grid,.map-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:16px 20px;border-bottom:1px solid var(--line);gap:14px}
  .nav.show{display:flex}
  .nav-toggle{display:block}
  .header-inner .btn-sm{display:none}
  .hero h1{font-size:28px}
  .hero{padding:48px 0 60px}
  .grid3,.dl-grid,.art-grid,.stats,.footer-grid,.map-grid{grid-template-columns:1fr}
  .sec{padding:52px 0}
  .sec-head h2{font-size:24px}
}