*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --navy:#0f172a;--navy2:#1e293b;
  --safe:#22c55e;--safe-d:#16a34a;--safe-l:#dcfce7;
  --warn:#f59e0b;--danger:#ef4444;
  --bg:#f8fafc;--card:#fff;--text:#0f172a;--muted:#64748b;
  --line:#e2e8f0;--max:1100px;--pad:clamp(18px,4vw,32px);--sec:clamp(48px,7vw,72px);
  --sans:"Noto Sans SC",system-ui,sans-serif;--mono:Consolas,monospace
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.65}
a{color:var(--safe-d)}img{display:block;max-width:100%}

/* 安全站顶栏 */
.sec-header{background:var(--navy);border-bottom:3px solid var(--safe);position:sticky;top:0;z-index:200}
.header-inner{max-width:var(--max);margin:0 auto;padding:0 var(--pad);height:62px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:.95rem;color:#fff;text-decoration:none}
.brand img{width:32px;height:32px;border-radius:50%}
.brand .shield{font-size:.65rem;color:var(--safe);font-weight:700}
.main-nav{display:flex;gap:3px}
.main-nav a{padding:7px 14px;text-decoration:none;color:rgba(255,255,255,.7);font-size:.82rem;font-weight:600;border-radius:6px}
.main-nav a:hover{color:#fff}
.main-nav a.on{color:var(--navy);background:var(--safe)}
.nav-cta{padding:9px 16px;background:var(--safe);color:var(--navy);font-size:.82rem;font-weight:800;text-decoration:none;border-radius:8px}
.nav-cta:hover{background:var(--safe-d);color:#fff}

.page{max-width:var(--max);margin:0 auto;padding:0 var(--pad)}
.crumb{padding:12px 0;font-size:.76rem;color:var(--muted)}
.crumb a{color:var(--safe-d);text-decoration:none}

/* 安全首页 */
.sec-hero{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding:clamp(32px,5vw,52px) 0;align-items:center}
.sec-hero-text h1{font-size:clamp(1.5rem,3.5vw,2.2rem);font-weight:800;line-height:1.25;margin-bottom:12px}
.sec-hero-text h1 span{color:var(--safe)}
.sec-hero-text p{font-size:.9rem;color:var(--muted);margin-bottom:20px;line-height:1.75}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;padding:11px 22px;font-weight:700;font-size:.86rem;text-decoration:none;border-radius:8px;transition:.2s}
.btn-safe{background:var(--safe);color:var(--navy)}
.btn-safe:hover{background:var(--safe-d);color:#fff}
.btn-outline{border:2px solid var(--line);color:var(--text);background:#fff}
.btn-outline:hover{border-color:var(--safe);color:var(--safe-d)}

/* 校验面板 */
.verify-panel{background:var(--navy);border-radius:16px;padding:28px 24px;color:#fff;border:2px solid var(--safe)}
.verify-panel h2{font-size:1rem;font-weight:800;margin-bottom:4px;display:flex;align-items:center;gap:8px}
.verify-panel h2::before{content:'✓';width:24px;height:24px;background:var(--safe);color:var(--navy);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:900}
.verify-panel .hint{font-size:.76rem;color:rgba(255,255,255,.6);margin-bottom:16px}
.verify-list{display:flex;flex-direction:column;gap:8px}
.verify-item{display:flex;align-items:flex-start;gap:10px;padding:12px;background:rgba(255,255,255,.06);border-radius:10px;font-size:.82rem;border:1px solid rgba(34,197,94,.2)}
.verify-item .ck{color:var(--safe);font-weight:900;flex-shrink:0}
.verify-item code{font-family:var(--mono);font-size:.75rem;color:#86efac;background:rgba(0,0,0,.2);padding:2px 6px;border-radius:4px}

.section{padding:var(--sec) 0}
.section-card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:clamp(22px,4vw,32px);margin-bottom:18px}
.section-head{margin-bottom:22px}
.section-head .label{font-size:.68rem;font-weight:800;color:var(--safe-d);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px}
.section-head h2{font-size:clamp(1.15rem,2.5vw,1.5rem);font-weight:800}

.threat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.threat-card{padding:18px;background:var(--bg);border:1px solid var(--line);border-radius:12px}
.threat-card .lvl{font-size:.64rem;font-weight:800;padding:3px 8px;border-radius:4px;display:inline-block;margin-bottom:8px}
.threat-card .lvl.high{background:#fee2e2;color:var(--danger)}
.threat-card .lvl.mid{background:#fef3c7;color:var(--warn)}
.threat-card .lvl.low{background:var(--safe-l);color:var(--safe-d)}
.threat-card h4{font-size:.86rem;font-weight:700;margin-bottom:5px}
.threat-card p{font-size:.8rem;color:var(--muted);line-height:1.55}

.sec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.sec-card{padding:22px;background:var(--bg);border:1px solid var(--line);border-radius:12px}
.sec-card.accent{background:linear-gradient(135deg,var(--navy),var(--navy2));color:#fff;border:none}
.sec-card.accent p{color:rgba(255,255,255,.8)}
.sec-card .ico{font-size:1.5rem;margin-bottom:8px}
.sec-card h3{font-size:.9rem;font-weight:700;margin-bottom:5px}
.sec-card p{font-size:.82rem;color:var(--muted);line-height:1.55}

.spec-table{width:100%;border-collapse:collapse;font-size:.84rem;margin:14px 0}
.spec-table th,.spec-table td{padding:11px 13px;border:1px solid var(--line);text-align:left;vertical-align:top}
.spec-table th{background:var(--safe-l);color:var(--safe-d);font-weight:700}
.spec-table td{color:var(--muted);line-height:1.55}
.proto-box{padding:22px;background:var(--bg);border-left:4px solid var(--safe);border-radius:0 12px 12px 0;margin-top:16px}
.proto-box h3{font-size:.92rem;font-weight:700;color:var(--safe-d);margin-bottom:8px}
.proto-box p{font-size:.86rem;color:var(--muted);line-height:1.7;margin-bottom:8px}

.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.compare-col{padding:22px;border-radius:12px;border:1px solid var(--line)}
.compare-col.old{background:var(--bg)}.compare-col.new{background:var(--safe-l)}
.compare-col h3{font-size:.9rem;font-weight:700;margin-bottom:10px}
.compare-col.new h3{color:var(--safe-d)}
.compare-col li{font-size:.82rem;color:var(--muted);margin-bottom:6px;list-style:none;padding-left:12px;position:relative}
.compare-col li::before{content:'';position:absolute;left:0;top:8px;width:4px;height:4px;border-radius:50%;background:var(--safe)}

.checklist li{font-size:.86rem;color:var(--muted);margin-bottom:10px;padding-left:24px;position:relative;list-style:none;line-height:1.6}
.checklist li::before{content:'✓';position:absolute;left:0;color:var(--safe);font-weight:900}

.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.dl-tile{padding:22px;background:var(--card);border:2px solid var(--line);border-radius:12px;text-align:center;color:inherit;transition:.25s}
.dl-tile:hover{border-color:var(--safe);box-shadow:0 6px 20px rgba(34,197,94,.1)}
.dl-tile .ico{font-size:2rem;margin-bottom:8px}
.dl-tile h3{font-size:.86rem;font-weight:700}
.dl-tile p{font-size:.72rem;color:var(--muted);margin-top:4px}
.dl-tile .safe-tag{display:inline-block;margin-top:8px;font-size:.65rem;background:var(--safe-l);color:var(--safe-d);padding:3px 8px;border-radius:4px;font-weight:700}
.dl-tile .dl-btn{display:inline-block;margin-top:12px;padding:8px 18px;background:var(--safe);color:#fff;font-size:.78rem;font-weight:700;border-radius:8px;text-decoration:none;transition:.2s}
.dl-tile .dl-btn:hover{background:var(--safe-d)}

.dl-steps{padding:22px;background:var(--bg);border-radius:12px;border:1px solid var(--line);margin-top:20px}
.dl-steps h3{font-size:.92rem;font-weight:700;color:var(--safe-d);margin-bottom:12px}
.dl-steps ol{padding-left:20px}.dl-steps li{font-size:.86rem;color:var(--muted);margin-bottom:8px;line-height:1.6}
.dl-steps li strong{color:var(--text)}

.news-list{display:flex;flex-direction:column;gap:12px}
.news-item{display:grid;grid-template-columns:90px 1fr;gap:14px;padding:20px;background:var(--card);border:1px solid var(--line);border-radius:12px;text-decoration:none;color:inherit}
.news-item:hover{border-color:var(--safe)}
.news-item time{font-size:.76rem;color:var(--safe-d);font-weight:700}
.news-item h3{font-size:.9rem;font-weight:700;margin:4px 0}
.news-item p{font-size:.82rem;color:var(--muted);line-height:1.55}
.news-item .tag{font-size:.66rem;background:var(--safe-l);color:var(--safe-d);padding:2px 8px;border-radius:4px;font-weight:600}
.news-article{padding:24px;background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px}
.news-article .meta{font-size:.72rem;color:var(--safe-d);font-weight:600;margin-bottom:6px}
.news-article h2{font-size:.95rem;font-weight:700;margin-bottom:8px}
.news-article p{font-size:.86rem;color:var(--muted);line-height:1.7;margin-bottom:8px}
.news-source{font-size:.72rem;color:var(--muted);margin-top:12px;padding-top:10px;border-top:1px dashed var(--line)}
.news-source a{font-weight:600}
.practice-tip{background:#ecfdf5;border-left:4px solid var(--safe);padding:14px 16px;border-radius:0 10px 10px 0;margin:14px 0;font-size:.84rem;color:var(--muted);line-height:1.65}
.practice-tip strong{color:var(--text)}

.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.faq-box{padding:18px;background:var(--bg);border:1px solid var(--line);border-radius:12px}
.faq-box h4{font-size:.86rem;font-weight:700;color:var(--safe-d);margin-bottom:5px}
.faq-box p{font-size:.82rem;color:var(--muted);line-height:1.55}
.faq-details details{border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:var(--card)}
.faq-details summary{padding:14px 18px;font-weight:700;font-size:.86rem;cursor:pointer;list-style:none}
.faq-details summary::before{content:'+ ';color:var(--safe)}
.faq-details details[open] summary::before{content:'− '}
.faq-details details p{padding:0 18px 14px;font-size:.84rem;color:var(--muted);line-height:1.65}

.site-foot{padding:28px 0 40px;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.site-foot a{color:var(--safe-d);text-decoration:none}
.friend-links{margin-top:8px;font-size:.76rem}

.fab-nav{position:fixed;bottom:20px;right:20px;z-index:300}
.fab-toggle{width:50px;height:50px;border-radius:12px;border:none;background:var(--safe);color:var(--navy);font-size:1.2rem;cursor:pointer;font-weight:900}
.fab-menu{position:absolute;bottom:58px;right:0;display:flex;flex-direction:column;gap:5px;opacity:0;pointer-events:none;transition:.2s}
.fab-nav.open .fab-menu{opacity:1;pointer-events:auto}
.fab-menu a{padding:10px 14px;background:#fff;border:1px solid var(--line);font-size:.78rem;text-decoration:none;border-radius:8px;color:var(--muted);white-space:nowrap}
.fab-menu a.on,.fab-menu a:hover{color:var(--safe-d);border-color:var(--safe)}

@media(max-width:900px){
  .sec-hero,.sec-grid,.compare,.faq-grid,.threat-grid,.dl-grid{grid-template-columns:1fr}
  .main-nav{display:none}
}
@media(max-width:480px){.news-item{grid-template-columns:1fr}}

.screenshot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:16px 0 8px}
.guide-screenshot{margin:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px}
.guide-screenshot img{width:100%;max-width:100%;height:auto;border-radius:10px;border:1px solid rgba(0,0,0,.06);display:block}
.guide-screenshot a{display:block;line-height:0}
.guide-screenshot a:hover img{opacity:.92}
.guide-screenshot figcaption{font-size:.72rem;color:var(--muted);margin-top:10px;line-height:1.55}
.guide-screenshot figcaption strong{color:inherit;font-weight:700}