/* 涌客来Ai获客 · 官网样式 v2
   层次策略：每个分区有独立强调色（--accent/--accent2）与微差背景，
   形成「一区一色」的视觉节奏；标题层级 h1 > h2(分区) > h3(卡片) > h4(小节)。 */

:root{
  --bg:#060a16;
  --card:rgba(255,255,255,.045);
  --card2:rgba(255,255,255,.08);
  --line:rgba(148,163,184,.16);
  --line2:rgba(148,163,184,.32);
  --text:#e9eefc;
  --muted:#9aa9c8;
  --brand:#3b82f6;
  --brand2:#8b5cf6;
  --ok:#22c55e;
  --warn:#f59e0b;
  --radius:18px;
  --radius-sm:12px;
  --wrap:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
html,body{margin:0;padding:0}
body{
  background:var(--bg);
  color:var(--text);
  font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul,ol{margin:0;padding-left:20px}
p{margin:0}
h1,h2,h3,h4{margin:0;line-height:1.35}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 28px}
.muted{color:var(--muted)}
.small{font-size:13px}
.tiny{font-size:12px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px;word-break:break-all}
.mobile-only{display:none}

/* ============ 导航 ============ */
.nav{position:sticky;top:0;z-index:80;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);background:rgba(6,10,22,.85);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:18px}
.logo-img{width:38px;height:38px;border-radius:11px;object-fit:cover;box-shadow:0 6px 18px rgba(59,130,246,.35)}
.logo-text em{font-style:normal;color:var(--muted);font-weight:500}
.nav-links{display:flex;align-items:center;gap:24px;font-size:15px}
.nav-links a{color:var(--muted);transition:color .18s}
.nav-links a:hover{color:#93c5fd}
.btn-mini{padding:8px 16px;border-radius:999px;background:linear-gradient(135deg,var(--brand),var(--brand2));font-size:14px;color:#fff!important;font-weight:600}
.nav-toggle{display:none;width:42px;height:38px;border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.04);cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px;padding:0}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--text);border-radius:2px;transition:transform .2s,opacity .2s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-mask{display:none}

/* ============ 通用分区：一区一色 ============ */
.sec{
  padding:86px 0;position:relative;
  --accent:var(--brand);--accent2:var(--brand2);--accent-soft:rgba(59,130,246,.14);
}
.sec.alt{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-tight{padding:60px 0}
.sec-head{max-width:760px;margin-bottom:38px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12.5px;letter-spacing:.14em;color:var(--accent);text-transform:uppercase;margin-bottom:12px;font-weight:600}
.eyebrow::before{content:"";width:22px;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent2));display:inline-block;border-radius:2px}
.sec-title{font-size:clamp(24px,3vw,34px);font-weight:800;letter-spacing:-.3px}
.sec-sub{margin-top:12px;color:var(--muted);font-size:16px}
.sec-note{margin-top:14px;padding-left:14px;border-left:2px solid var(--line2);color:var(--muted);font-size:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:13px 24px;border-radius:14px;font-size:15px;font-weight:600;border:1px solid transparent;transition:transform .15s ease,box-shadow .2s ease,background .2s ease;cursor:pointer}
.btn:hover{transform:translateY(-2px)}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 12px 28px rgba(59,130,246,.32)}
.btn.ghost{background:var(--card);border-color:var(--line2);color:var(--text)}
.btn.big{padding:16px 30px;font-size:16px;width:100%}
.btn.sm{padding:8px 14px;font-size:13.5px;border-radius:10px}
.ico{font-size:15px}

/* 分区底色（微差层次） */
#why{background:#0b0d1a}
#features{background:linear-gradient(180deg,#081226,#0a1832)}
#preview{background:#0c0a1c}
#framework{background:linear-gradient(180deg,#07181f,#0a2028)}
#flow{background:#120e08}
#tutorial{background:linear-gradient(180deg,#160a1c,#1d0e26)}
#cases{background:#07130c}
#audience{background:linear-gradient(180deg,#0b0e24,#101430)}
#faq{background:#0a0d18}
#changelog{background:linear-gradient(180deg,#0a0f1c,#0c1220)}
#download{background:radial-gradient(120% 100% at 50% 0%,rgba(59,130,246,.15),transparent 60%),#081226}
#partner{background:#120f06}

/* 分区强调色 */
#why{--accent:#fb7185;--accent2:#f59e0b;--accent-soft:rgba(251,113,133,.14)}
#features{--accent:#38bdf8;--accent2:#818cf8;--accent-soft:rgba(56,189,248,.14)}
#preview{--accent:#a78bfa;--accent2:#e879f9;--accent-soft:rgba(167,139,250,.16)}
#framework{--accent:#2dd4bf;--accent2:#22d3ee;--accent-soft:rgba(45,212,191,.14)}
#flow{--accent:#fbbf24;--accent2:#fb923c;--accent-soft:rgba(251,191,36,.14)}
#tutorial{--accent:#f472b6;--accent2:#a78bfa;--accent-soft:rgba(244,114,182,.14)}
#cases{--accent:#4ade80;--accent2:#34d399;--accent-soft:rgba(74,222,128,.14)}
#audience{--accent:#818cf8;--accent2:#60a5fa;--accent-soft:rgba(129,140,248,.15)}
#faq{--accent:#94a3b8;--accent2:#cbd5e1;--accent-soft:rgba(148,163,184,.12)}
#changelog{--accent:#7dd3fc;--accent2:#94a3b8;--accent-soft:rgba(125,211,252,.12)}
#partner{--accent:#fbbf24;--accent2:#f59e0b;--accent-soft:rgba(251,191,36,.14)}

/* ============ 首屏 ============ */
.hero{position:relative;padding:78px 0 66px;overflow:hidden;background:radial-gradient(110% 90% at 70% 0%,rgba(139,92,246,.16),transparent 55%),radial-gradient(90% 80% at 15% 20%,rgba(59,130,246,.14),transparent 55%)}
.hero-bg{position:absolute;inset:0;background:url("hero-bg.svg") center/cover no-repeat;opacity:.35}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,22,.25),rgba(6,10,22,.88) 78%)}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.badge{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border-radius:999px;background:var(--card);border:1px solid var(--line);font-size:13.5px;color:var(--muted);margin-bottom:20px}
.badge .dot{width:8px;height:8px;border-radius:50%;background:var(--ok);box-shadow:0 0 10px var(--ok)}
.hero h1{font-size:clamp(32px,4.2vw,56px);font-weight:800;letter-spacing:-.6px}
.grad{background:linear-gradient(120deg,#60a5fa,#c084fc);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{margin:20px 0 30px;font-size:17px;color:var(--muted);max-width:560px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.hero-meta{list-style:none;display:flex;gap:20px;flex-wrap:wrap;margin-top:26px;padding:0;font-size:13.5px;color:var(--muted)}
.hero-meta li::before{content:"✓";color:var(--ok);margin-right:6px}
.hero-card{border-radius:22px;overflow:hidden;border:1px solid var(--line2);box-shadow:0 24px 60px rgba(0,0,0,.45)}

/* ============ 信任条 ============ */
.trust{background:rgba(255,255,255,.03);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trust-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.trust-item{padding:20px 24px;text-align:center;border-right:1px solid var(--line)}
.trust-item:last-child{border-right:none}
.trust-item b{display:block;font-size:19px;font-weight:700}
.trust-item span{font-size:12.5px;color:var(--muted)}

/* ============ 痛点 ============ */
.pain{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.pain-item{padding:22px;border-radius:var(--radius-sm);background:var(--card);border:1px solid var(--line)}
.pain-q{font-size:14px;color:var(--accent);margin-bottom:10px}
.pain-a{font-size:14.5px;font-weight:600;margin-bottom:6px}
.pain-d{font-size:13.5px;color:var(--muted)}

/* ============ 能力卡 ============ */
.feat{padding:26px;transition:border-color .2s,transform .2s}
.feat:hover{border-color:var(--line2);transform:translateY(-3px)}
.fi{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:var(--accent-soft);font-size:21px;margin-bottom:14px}
.feat h3{font-size:17px;margin-bottom:8px}
.feat p{color:var(--muted);font-size:14.5px}

/* ============ 产品预览 ============ */
.preview{display:grid;grid-template-columns:200px 1fr;gap:18px}
.preview-tabs{display:flex;flex-direction:column;gap:10px}
.ptab{padding:13px 16px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--muted);text-align:left;cursor:pointer;font-size:14.5px;transition:all .18s}
.ptab:hover{border-color:var(--line2);color:var(--text)}
.ptab.active{background:linear-gradient(135deg,var(--accent-soft),rgba(167,139,250,.12));border-color:var(--accent);color:#fff;font-weight:600}
.preview-stage{overflow:hidden}
.preview-stage img{width:100%}
.preview-cap{padding:13px 18px;border-top:1px solid var(--line);font-size:14px;color:var(--muted)}

/* ============ 功能框架 ============ */
.step{display:flex;gap:18px;padding:26px;align-items:flex-start}
.step-no{flex:none;width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));font-weight:800;font-size:18px;color:#04121a}
.step-pain{font-size:12.5px;color:var(--warn);margin-bottom:6px}
.step-txt h3{font-size:17px;margin-bottom:10px}
.step-txt ul{color:var(--muted);font-size:14px}

/* ============ 四步流程 ============ */
.flow{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.flow-item{position:relative;padding:24px;border-radius:var(--radius-sm);background:var(--card);border:1px solid var(--line)}
.flow-item::after{content:"";position:absolute;right:-9px;top:50%;width:16px;height:16px;border-top:1px solid var(--line2);border-right:1px solid var(--line2);transform:translateY(-50%) rotate(45deg)}
.flow-item:last-child::after{display:none}
.flow-no{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;background:var(--accent-soft);border:1px solid var(--accent);font-weight:700;font-size:15px;margin-bottom:12px;color:var(--accent)}
.flow-item h3{font-size:16px;margin-bottom:8px}
.flow-item p{font-size:14px;color:var(--muted)}

/* ============ 视频 ============ */
.video-wrap{display:grid;grid-template-columns:1fr 300px;gap:18px}
.video-main{overflow:hidden}
.video-main video{width:100%;display:block;background:#000}
.video-bar{display:flex;justify-content:space-between;align-items:center;padding:13px 18px;border-top:1px solid var(--line);font-size:14px}
.video-list{display:flex;flex-direction:column;gap:10px}
.vitem{padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--card);color:var(--muted);text-align:left;cursor:pointer;font-size:14px;transition:all .18s}
.vitem:hover{border-color:var(--line2);color:var(--text)}
.vitem.active{background:linear-gradient(135deg,var(--accent-soft),rgba(167,139,250,.12));border-color:var(--accent);color:#fff;font-weight:600}

/* ============ 案例 ============ */
.cases{grid-template-columns:repeat(4,1fr)}
.case{padding:14px;border-radius:var(--radius-sm);background:var(--card);border:1px solid var(--line)}
.case img{width:100%;border-radius:9px;margin-bottom:11px}
.case h4{font-size:14.5px;margin-bottom:5px}
.case p{font-size:13px;color:var(--muted)}

/* ============ 适用人群 ============ */
.audience{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.aud{padding:24px;border-radius:var(--radius-sm);background:var(--card);border:1px solid var(--line)}
.aud h3{font-size:16px;margin-bottom:10px;display:flex;align-items:center;gap:9px}
.aud h3::before{content:"";width:7px;height:7px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2))}
.aud ul{color:var(--muted);font-size:14px}

/* ============ FAQ ============ */
.faq-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:20px}
.ftab{padding:9px 16px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--muted);cursor:pointer;font-size:14px}
.ftab.active{background:var(--accent-soft);border-color:var(--accent);color:#fff;font-weight:600}
.faq-group{display:none}
.faq-group.active{display:block}
.faq details{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--card);margin-bottom:10px;overflow:hidden}
.faq summary{padding:15px 18px;cursor:pointer;font-weight:600;font-size:15px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--muted);font-weight:400}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 18px 16px;color:var(--muted);font-size:14.5px}

/* ============ 更新日志 ============ */
.log{list-style:none;padding:0;margin:0;border-left:2px solid var(--line);padding-left:26px}
.log li{position:relative;padding-bottom:28px}
.log li::before{content:"";position:absolute;left:-33px;top:6px;width:12px;height:12px;border-radius:50%;background:var(--bg);border:2px solid var(--accent)}
.log li:first-child::before{background:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.log-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:10px}
.log-head b{font-size:16px}
.log-tag{font-size:11.5px;padding:3px 9px;border-radius:999px;background:var(--accent-soft);color:#dbeafe}
.log ul{color:var(--muted);font-size:14px}
.log-actions{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}

/* ============ 下载（核心） ============ */
.dl-wrap{display:grid;grid-template-columns:1fr 340px;gap:20px;align-items:start}
.dl-card{padding:26px}
.dl-platforms{display:flex;gap:10px;margin-bottom:20px;flex-wrap:wrap}
.dl-plat{flex:1;min-width:120px;padding:14px 12px;border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--card);cursor:pointer;text-align:center;transition:all .18s;position:relative;color:var(--text)}
.dl-plat:hover{border-color:var(--line2)}
.dl-plat.active{background:linear-gradient(135deg,rgba(59,130,246,.24),rgba(139,92,246,.2));border-color:rgba(147,197,253,.55)}
.dl-plat .pi{font-size:22px;display:block;margin-bottom:6px}
.dl-plat b{display:block;font-size:14.5px}
.dl-plat span{font-size:12px;color:var(--muted)}
.dl-plat .rec{position:absolute;top:-9px;right:8px;font-size:11px;padding:2px 8px;border-radius:999px;background:var(--ok);color:#04140a;font-weight:700}
.dl-plat .soon{position:absolute;top:-9px;right:8px;font-size:11px;padding:2px 8px;border-radius:999px;background:rgba(245,158,11,.9);color:#1a1204;font-weight:700}
.dl-filters{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:18px}
.dl-field label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:6px}
.dl-field select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--line2);background:#0a1428;color:var(--text);font-size:14px;cursor:pointer}
.dl-main-box{padding:20px;border-radius:var(--radius-sm);background:rgba(59,130,246,.08);border:1px solid rgba(147,197,253,.28)}
.dl-row{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.dl-ver{font-size:18px;font-weight:700}
.dl-ver .v{color:#93c5fd}
.dl-facts{display:flex;gap:18px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.dl-facts b{color:var(--text);font-weight:600}
.dl-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.dl-url{margin-top:16px}
.dl-url label{display:block;font-size:12.5px;color:var(--muted);margin-bottom:6px}
.copy-row{display:flex;gap:8px}
.copy-row input{flex:1;min-width:0;padding:10px 12px;border-radius:10px;border:1px solid var(--line2);background:#0a1428;color:var(--muted);font-size:12.5px;font-family:ui-monospace,Menlo,Consolas,monospace}
.dl-verify{margin-top:16px;border-top:1px solid var(--line);padding-top:14px}
.dl-verify summary{cursor:pointer;font-size:13.5px;color:#93c5fd;list-style:none}
.dl-verify summary::-webkit-details-marker{display:none}
.dl-verify summary::after{content:" 展开"}
.dl-verify[open] summary::after{content:" 收起"}
.dl-hash{margin-top:12px}
.dl-hash .row{display:flex;gap:8px;align-items:flex-start;margin-bottom:8px}
.dl-hash .k{flex:none;width:76px;font-size:12px;color:var(--muted);padding-top:3px}
.dl-planned{padding:22px;border-radius:var(--radius-sm);background:rgba(245,158,11,.08);border:1px solid rgba(245,158,11,.35);text-align:center}
.dl-planned b{display:block;font-size:16px;margin-bottom:8px}
.dl-planned p{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.dl-side{padding:24px}
.dl-side h4{font-size:14px;margin:0 0 10px;color:#93c5fd}
.dl-side h4:not(:first-child){margin-top:22px}
.req{list-style:none;padding:0;font-size:13.5px;color:var(--muted)}
.req li{padding:5px 0;border-bottom:1px dashed var(--line)}
.req li:last-child{border-bottom:none}

/* 历史版本 */
.hist{margin-top:16px}
.hist table{width:100%;border-collapse:collapse;font-size:13.5px}
.hist th,.hist td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line)}
.hist th{font-size:12.5px;color:var(--muted);font-weight:500}
.hist td.v{font-weight:700}

/* ============ 渠道 ============ */
.partner{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}

/* ============ 页脚 ============ */
.foot{border-top:1px solid var(--line);background:#070b16;padding:44px 0 26px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
.foot-col h5{font-size:13.5px;margin:0 0 12px;color:#93c5fd;font-weight:600}
.foot-col a,.foot-col p{display:block;font-size:13.5px;color:var(--muted);padding:4px 0}
.foot-col a:hover{color:var(--text)}
.foot-brand{display:flex;gap:12px;align-items:flex-start}
.foot-bottom{margin-top:26px;padding-top:18px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .hero-inner{grid-template-columns:1fr;gap:34px}
  .g4,.pain,.flow,.cases{grid-template-columns:repeat(2,1fr)}
  .g3,.audience,.partner{grid-template-columns:repeat(2,1fr)}
  .video-wrap{grid-template-columns:1fr}
  .video-list{flex-direction:row;flex-wrap:wrap}
  .vitem{flex:1}
  .dl-wrap{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .trust-inner{grid-template-columns:repeat(2,1fr)}
  .trust-item:nth-child(2){border-right:none}
}
@media (max-width:720px){
  .mobile-only{display:block}
  /* 移动端抽屉导航：fixed + 遮罩 + 高 z-index，保证必可点击 */
  .nav-toggle{display:flex}
  .nav-links{
    position:fixed;top:70px;left:0;right:0;z-index:75;
    flex-direction:column;align-items:stretch;gap:0;
    background:rgba(6,10,22,.98);border-bottom:1px solid var(--line);
    padding:8px 24px 18px;display:none;max-height:calc(100vh - 70px);overflow-y:auto;
    box-shadow:0 24px 48px rgba(0,0,0,.5);
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:14px 0;border-bottom:1px solid var(--line);font-size:15.5px}
  .nav-links a:last-child{border-bottom:none}
  .nav-links .btn-mini{margin-top:12px;text-align:center;padding:12px 16px}
  .nav-mask{display:none;position:fixed;inset:70px 0 0 0;z-index:70;background:rgba(2,4,10,.55)}
  .nav-mask.open{display:block}

  .wrap{padding:0 20px}
  .sec{padding:44px 0}
  .sec-head{margin-bottom:22px}
  .hero{padding:40px 0 34px}
  .lead{font-size:15.5px}

  .g4,.g3,.g2,.pain,.flow,.audience,.partner,.dl-filters{grid-template-columns:1fr}
  .preview{display:block}
  .preview-tabs{flex-direction:row;overflow-x:auto;margin-bottom:14px;-webkit-overflow-scrolling:touch}
  .ptab{white-space:nowrap;flex:none}
  .flow-item::after{display:none}

  /* 案例：横向滑动卡片，一屏一张半，snap 定位 */
  .cases{
    display:flex;overflow-x:auto;gap:12px;
    scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
    margin:0 -20px;padding:0 20px 8px;
  }
  .cases::-webkit-scrollbar{display:none}
  .case{flex:0 0 76%;scroll-snap-align:start}
  .case p{display:none} /* 简约：移动端只留标题与截图 */

  /* 下载区：解除历史表格 min-width 造成的横向溢出 */
  .dl-card,.dl-side{min-width:0}
  .dl-platforms{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}
  .dl-plat{min-width:0;padding:12px 6px}
  .dl-plat span{display:none} /* 简约：版本信息已在下方筛选器中 */
  .dl-plat .pi{font-size:19px;margin-bottom:4px}
  .dl-plat b{font-size:13.5px}
  .dl-plat span{font-size:11.5px}

  /* 下载侧栏紧凑：系统要求双列、小节间距收紧 */
  .dl-side h4{margin-bottom:7px}
  .dl-side h4:not(:first-child){margin-top:14px}
  .dl-side .req{display:grid;grid-template-columns:1fr 1fr;gap:0 14px;font-size:12.5px}
  .dl-side .req li{padding:4px 0}
  .dl-side p.small{font-size:12.5px;line-height:1.7}

  /* 下载区简约：隐藏下载地址复制行、按钮大图标，按钮改为整行 */
  .dl-url{display:none}
  .dl-actions{flex:0 0 100%}
  .dl-actions .btn{width:100% !important;justify-content:center}
  .dl-actions .btn .ico{display:none}
  .dl-actions .btn.big{padding:13px 16px;font-size:15px}
  .dl-verify summary{font-size:13px}

  /* 页脚简约收尾：只留品牌 + 单行版权，去掉所有栏目链接 */
  .foot{padding:26px 0 22px}
  .foot-grid{display:block}
  .foot-col:not(.foot-brand-col){display:none}
  .foot-brand{flex-direction:column;align-items:center;text-align:center;gap:9px}
  .foot-brand img.logo-img{width:42px;height:42px}
  .foot-brand b{font-size:15px}
  .foot-brand p{font-size:11.5px;line-height:1.6}
  .foot-bottom{
    margin-top:16px;padding-top:0;border-top:none;
    justify-content:center;text-align:center;font-size:11.5px;gap:4px;
  }
  .foot-note{display:none}

  .trust-inner{grid-template-columns:repeat(2,1fr)}
  .trust-item{border-right:none;border-bottom:1px solid var(--line);padding:14px 12px}
  .hist{overflow-x:auto}
  .hist table{min-width:560px}
  .dl-card,.dl-side{padding:18px}
}