*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --blue:#2AABEE;--blue-d:#1a8fc7;--blue-l:#e8f6fd;
  --bg:#fff;--bg2:#f8fbfe;--text:#1a1a1a;--muted:#6b7280;
  --line:#e5eef5;--max:1140px;--pad:clamp(18px,4vw,32px);--sec:clamp(48px,7vw,72px);
  --sans:"Noto Sans SC",system-ui,sans-serif
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg2);color:var(--text);line-height:1.65}
a{color:var(--blue)}img{display:block;max-width:100%}

/* 关键词条 — 必应可见 */
.kw-strip{background:var(--blue);color:#fff;text-align:center;padding:9px var(--pad);font-size:.78rem;font-weight:600;letter-spacing:.04em}
.kw-strip b{font-weight:800;margin:0 6px}

/* 官网门户顶栏 */
.portal-header{background:#fff;border-bottom:3px solid var(--blue);position:sticky;top:0;z-index:200;box-shadow:0 2px 12px rgba(42,171,238,.08)}
.header-inner{max-width:var(--max);margin:0 auto;padding:0 var(--pad);height:64px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.05rem;color:var(--blue);text-decoration:none}
.brand img{width:36px;height:36px;border-radius:50%}
.brand-tag{font-size:.62rem;background:var(--blue-l);color:var(--blue-d);padding:2px 8px;border-radius:4px;font-weight:700;margin-left:4px}
.main-nav{display:flex;gap:4px}
.main-nav a{padding:8px 16px;text-decoration:none;color:var(--muted);font-size:.86rem;font-weight:600;border-radius:6px}
.main-nav a:hover{color:var(--blue);background:var(--blue-l)}
.main-nav a.on{color:#fff;background:var(--blue)}
.nav-cta{padding:10px 20px;background:var(--blue);color:#fff;font-size:.84rem;font-weight:700;text-decoration:none;border-radius:8px}
.nav-cta:hover{background:var(--blue-d)}

.page{max-width:var(--max);margin:0 auto;padding:0 var(--pad)}
.crumb{padding:14px 0;font-size:.78rem;color:var(--muted)}
.crumb a{color:var(--blue);text-decoration:none}

/* 官网首页双栏 */
.portal-hero{display:grid;grid-template-columns:1.15fr .85fr;gap:28px;padding:clamp(36px,5vw,56px) 0;align-items:start}
.portal-hero-main{background:#fff;border:1px solid var(--line);border-radius:16px;padding:clamp(28px,4vw,40px);box-shadow:0 8px 32px rgba(42,171,238,.06)}
.portal-hero-main .badge{display:inline-block;background:var(--blue-l);color:var(--blue-d);font-size:.72rem;font-weight:700;padding:5px 12px;border-radius:20px;margin-bottom:14px}
.portal-hero-main h1{font-size:clamp(1.6rem,3.8vw,2.4rem);font-weight:800;line-height:1.25;margin-bottom:14px;color:var(--text)}
.portal-hero-main h1 em{font-style:normal;color:var(--blue)}
.portal-hero-main p{font-size:.92rem;color:var(--muted);line-height:1.75;margin-bottom:22px}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;padding:12px 24px;font-weight:700;font-size:.88rem;text-decoration:none;border-radius:10px;transition:.2s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-d);transform:translateY(-1px)}
.btn-secondary{background:#fff;color:var(--blue);border:2px solid var(--blue)}
.btn-secondary:hover{background:var(--blue-l)}

/* 右侧快捷下载面板 */
.quick-dl-panel{background:linear-gradient(160deg,var(--blue),var(--blue-d));border-radius:16px;padding:28px 24px;color:#fff;position:sticky;top:88px}
.quick-dl-panel h2{font-size:1.1rem;font-weight:800;margin-bottom:6px}
.quick-dl-panel .sub{font-size:.78rem;opacity:.88;margin-bottom:18px}
.quick-dl-list{display:flex;flex-direction:column;gap:8px}
.quick-dl-item{display:flex;align-items:center;gap:12px;padding:12px 14px;background:rgba(255,255,255,.15);border-radius:10px;text-decoration:none;color:#fff;font-size:.84rem;font-weight:600;transition:.2s;border:1px solid rgba(255,255,255,.12)}
.quick-dl-item:hover{background:rgba(255,255,255,.25);transform:translateX(4px)}
.quick-dl-item .ico{font-size:1.3rem;width:28px;text-align:center}
.quick-dl-panel .official{margin-top:16px;font-size:.7rem;opacity:.8;text-align:center}

/* 信任条 */
.trust-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:8px}
.trust-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 12px;text-align:center}
.trust-item b{display:block;font-size:1.2rem;color:var(--blue);font-weight:800}
.trust-item span{font-size:.72rem;color:var(--muted)}

.section{padding:var(--sec) 0}
.section-box{background:#fff;border:1px solid var(--line);border-radius:16px;padding:clamp(24px,4vw,36px);margin-bottom:20px}
.section-head{margin-bottom:24px}
.section-head h2{font-size:clamp(1.2rem,2.8vw,1.6rem);font-weight:800;margin-bottom:6px}
.section-head p{color:var(--muted);font-size:.88rem}

.stat-row,.why-grid,.feat-row,.compare,.faq-grid{display:grid;gap:14px}
.stat-row{grid-template-columns:repeat(4,1fr)}
.why-grid,.feat-row{grid-template-columns:repeat(3,1fr)}
.compare{grid-template-columns:1fr 1fr}
.faq-grid{grid-template-columns:1fr 1fr}
.stat-cell,.why-card,.feat-box,.faq-box{padding:20px;background:var(--bg2);border:1px solid var(--line);border-radius:12px}
.stat-cell{text-align:center}.stat-cell b{display:block;font-size:1.4rem;color:var(--blue);font-weight:800}
.stat-cell span,.why-card p,.feat-box p,.faq-box p{font-size:.82rem;color:var(--muted);line-height:1.55}
.why-card .ico{font-size:1.8rem;margin-bottom:8px}
.why-card h3,.feat-box h3,.faq-box h4{font-size:.9rem;font-weight:700;margin-bottom:6px}
.feat-box .n{font-size:.68rem;color:var(--blue);font-weight:700;margin-bottom:6px}
.compare-col{padding:22px;border-radius:12px;border:1px solid var(--line)}
.compare-col.old{background:var(--bg2)}.compare-col.new{background:var(--blue-l)}
.compare-col h3{font-size:.92rem;font-weight:700;margin-bottom:10px}
.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(--blue)}

.timeline{margin:16px 0;padding-left:20px;border-left:2px solid var(--blue-l)}
.tl-item{position:relative;padding:0 0 22px 18px}
.tl-item::before{content:'';position:absolute;left:-27px;top:5px;width:8px;height:8px;border-radius:50%;background:var(--blue)}
.tl-item h4{font-size:.88rem;font-weight:700;margin-bottom:4px}
.tl-item p{font-size:.84rem;color:var(--muted);line-height:1.6}
.deep-block{padding:20px;background:var(--bg2);border-radius:12px;border-left:4px solid var(--blue);margin:14px 0}
.deep-block h3{font-size:.92rem;font-weight:700;color:var(--blue-d);margin-bottom:8px}
.deep-block p{font-size:.86rem;color:var(--muted);line-height:1.7;margin-bottom:8px}
.spec-table{width:100%;border-collapse:collapse;font-size:.84rem}
.spec-table th,.spec-table td{padding:11px 13px;border:1px solid var(--line);text-align:left}
.spec-table th{background:var(--blue-l);color:var(--blue-d);font-weight:700}
.spec-table td{color:var(--muted)}

/* 下载页 */
.dl-page-hero{background:linear-gradient(135deg,var(--blue),var(--blue-d));border-radius:16px;padding:clamp(28px,4vw,40px);color:#fff;text-align:center;margin:20px 0}
.dl-page-hero h1{font-size:clamp(1.4rem,3.5vw,2rem);font-weight:800;margin-bottom:8px}
.dl-page-hero p{font-size:.9rem;opacity:.92;max-width:560px;margin:0 auto}
.dl-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.dl-tile{padding:22px 16px;background:#fff;border:2px solid var(--line);border-radius:14px;text-align:center;text-decoration:none;color:inherit;transition:.25s}
.dl-tile:hover{border-color:var(--blue);box-shadow:0 6px 20px rgba(42,171,238,.12);transform:translateY(-3px)}
.dl-tile .ico{font-size:2rem;margin-bottom:8px}
.dl-tile h3{font-size:.88rem;font-weight:700;margin-bottom:3px}
.dl-tile p{font-size:.72rem;color:var(--muted)}
.dl-tile .dl-btn{display:inline-block;margin-top:10px;padding:6px 14px;background:var(--blue);color:#fff;font-size:.72rem;font-weight:700;border-radius:6px}
.dl-steps{margin-top:24px;padding:24px;background:var(--bg2);border-radius:12px;border:1px solid var(--line)}
.dl-steps h3{font-size:.95rem;font-weight:700;color:var(--blue-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,.news-article{padding:22px;background:#fff;border:1px solid var(--line);border-radius:14px}
.news-item{display:grid;grid-template-columns:90px 1fr;gap:14px;text-decoration:none;color:inherit;transition:.2s}
.news-item:hover{border-color:var(--blue)}
.news-item time{font-size:.76rem;color:var(--blue);font-weight:700}
.news-item h3,.news-article h2{font-size:.92rem;font-weight:700;margin:4px 0}
.news-item p,.news-article p{font-size:.84rem;color:var(--muted);line-height:1.65}
.news-item .tag,.news-article .meta{font-size:.68rem;color:var(--blue);font-weight:600}
.news-article{margin-bottom:12px}
.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:#eff6ff;border-left:4px solid var(--blue);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-details details{border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:#fff}
.faq-details summary{padding:14px 18px;font-weight:700;font-size:.88rem;cursor:pointer;list-style:none}
.faq-details summary::before{content:'+ ';color:var(--blue)}
.faq-details details[open] summary::before{content:'− '}
.faq-details details p{padding:0 18px 14px;font-size:.84rem;color:var(--muted);line-height:1.7}

.site-foot{padding:28px 0 40px;border-top:1px solid var(--line);font-size:.8rem;color:var(--muted)}
.site-foot a{color:var(--blue);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(--blue);color:#fff;font-size:1.2rem;cursor:pointer;box-shadow:0 4px 16px rgba(42,171,238,.35)}
.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;color:var(--muted);text-decoration:none;border-radius:8px;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.06)}
.fab-menu a.on,.fab-menu a:hover{color:var(--blue);border-color:var(--blue)}

@media(max-width:900px){
  .portal-hero,.why-grid,.feat-row,.compare,.faq-grid,.dl-grid{grid-template-columns:1fr}
  .trust-bar,.stat-row{grid-template-columns:repeat(2,1fr)}
  .quick-dl-panel{position:static}
  .main-nav{display:none}
}
@media(max-width:480px){.trust-bar,.stat-row,.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}