/* 键盘管家官网：配色、圆角、阴影、键帽和 App 的 src/style.css（风格 A 清新浅色）一致 */
:root{
  --bg:#F7F9FC;--primary:#2F6BFF;--primary-d:#2257D9;--primary-soft:#E8EFFF;--accent:#5ED3F3;
  --text:#1B2333;--sub:#6B7487;--faint:#9AA3B5;--line:#E4E9F2;--card:#fff;
  --shadow:0 1px 2px rgba(40,72,140,.06),0 8px 24px rgba(40,72,140,.08);
  --shadow-lg:0 30px 80px rgba(30,50,100,.22);
  --r:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",sans-serif;color:var(--text);font-size:16px;line-height:1.7;
  background:radial-gradient(1200px 700px at -10% -10%,#DCE7FF 0,transparent 60%),radial-gradient(1000px 600px at 110% -5%,#DBF5FD 0,transparent 55%),var(--bg) no-repeat;
  -webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
/* 焦点框只在按 Tab 切换时出现（html.kbd-nav 由 site.js 加）；测试页一直在按键，交给浏览器判断会在点过的按钮上冒出外圈框。输入框用所在搜索条的 focus-within 提示 */
:focus{outline:none}
html.kbd-nav :is(a,button,summary,select):focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:6px}
img{max-width:100%;height:auto}
svg{flex:none}
[hidden]{display:none!important}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}
.wrap.narrow{max-width:860px}
.muted{color:var(--faint);font-size:13px}
.grow{flex:1;min-width:0}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:10px 22px;font-size:15px;font-weight:600;white-space:nowrap;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s}
.btn svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{background:linear-gradient(180deg,#4A80FF,#2F6BFF);color:#fff;box-shadow:0 6px 16px rgba(47,107,255,.3)}
.btn-primary:hover{background:linear-gradient(180deg,#3F77FF,#2560F0);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--primary);border:1.5px solid #9DBBFF}
.btn-ghost:hover{border-color:var(--primary)}
.btn-sm{padding:7px 18px;font-size:14px}
.btn-lg{padding:14px 30px;font-size:17px}
.btn.block{display:flex;width:100%}
.btn-white{background:#fff;color:var(--primary);box-shadow:0 6px 18px rgba(10,40,120,.2)}
.btn.is-off{cursor:default;opacity:.85}

/* 顶部导航 */
.top{position:sticky;top:0;z-index:20;background:rgba(247,249,252,.78);backdrop-filter:blur(20px) saturate(1.6);-webkit-backdrop-filter:blur(20px) saturate(1.6);border-bottom:1px solid rgba(30,60,120,.06)}
.top-in{display:flex;align-items:center;gap:32px;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700;letter-spacing:.5px}
.brand.sm{font-size:15px}.brand.sm .logo{width:28px;height:28px}
.logo{width:36px;height:36px;border-radius:10px;filter:drop-shadow(0 4px 10px rgba(47,107,255,.25))}
.logo.lg{width:64px;height:64px}.logo.xl{width:80px;height:80px;filter:drop-shadow(0 8px 20px rgba(0,20,90,.3))}
.menu{display:flex;gap:28px;flex:1;font-size:15px;color:#3A4458}
.menu a{white-space:nowrap}
.menu a:hover,.menu a[aria-current]{color:var(--primary)}
.menu a[aria-current]{font-weight:600}

/* 首屏 */
.hero{padding:72px 0 24px;text-align:center}
.hero h1{font-size:56px;line-height:1.2;margin:0 0 18px;letter-spacing:1px}
.lead{font-size:19px;color:var(--sub);margin:0 auto 32px;max-width:760px}
.cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.shot{position:relative;margin:56px auto 0;max-width:1040px;border-radius:14px;overflow:hidden;background:#EEF2F8;box-shadow:var(--shadow-lg),0 0 0 1px rgba(30,60,120,.08)}
.shot img{display:block;width:100%}
.win-bar{position:absolute;top:14px;left:16px;display:flex;gap:8px;z-index:1}
.win-bar i{width:12px;height:12px;border-radius:50%;background:#FF5F57}
.win-bar i:nth-child(2){background:#FEBC2E}.win-bar i:nth-child(3){background:#28C840}
.hero-sm{padding:40px 0 28px;text-align:left}
.hero-sm h1{font-size:38px;margin:14px 0 8px}
.hero-sm .lead{margin:0 0 24px;font-size:17px;max-width:none}

/* 区块 */
.sec{padding:72px 0 0}
.sec:last-of-type{padding-bottom:88px}
.sec-head{text-align:center;margin-bottom:32px}
.sec-head h2{font-size:34px;margin:0 0 8px;letter-spacing:.5px}
.sec-head p{margin:0;color:var(--sub)}
.sec-head.row{display:flex;align-items:baseline;justify-content:space-between;text-align:left}
.sec-head.row h2{font-size:28px}
.more-link{display:inline-flex;align-items:center;gap:2px;color:var(--primary);font-size:15px;font-weight:500}
.more-link svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}

/* 键帽插画（和 App 里的 .kc 一样） */
.keys{display:flex;align-items:center;gap:12px;height:64px;margin-bottom:18px}
.kc{display:inline-flex;align-items:center;justify-content:center;min-width:56px;height:50px;padding:0 14px;border-radius:12px;
  background:linear-gradient(180deg,#FFFFFF,#EBF0F8);box-shadow:0 2px 0 #D1D9E8,0 8px 18px rgba(47,86,160,.14),inset 0 1px 0 #fff;
  color:var(--primary);font-weight:700;font-size:16px;white-space:nowrap}
.kc.zh{flex-direction:column;line-height:1.05;font-size:14px;min-width:50px}
.ar{width:30px;height:30px;fill:none;stroke:var(--primary);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.ar.cy{stroke:#22B8E6}
.dots{display:inline-flex;gap:5px}.dots i{width:7px;height:7px;border-radius:50%;background:#9AA3B5}
.appico{display:grid;grid-template-columns:repeat(2,13px);gap:5px;padding:11px;border-radius:13px;background:linear-gradient(180deg,#7ADCF7,#3FA9F5);box-shadow:0 8px 18px rgba(47,140,220,.3)}
.appico i{width:13px;height:13px;border-radius:4px;background:rgba(255,255,255,.92)}
.mouse-ill{height:64px;width:52px}
.shield-ill{height:60px;width:auto;filter:drop-shadow(0 6px 12px rgba(47,107,255,.3))}
.keys.cover{justify-content:center;height:120px;margin:0;background:linear-gradient(135deg,#E8EFFF,#E3F6FD);border-radius:12px 12px 0 0}
.keys.mini{height:56px;width:96px;flex:none;justify-content:center;gap:4px;margin:0;border-radius:10px;background:linear-gradient(135deg,#E8EFFF,#E3F6FD)}
.keys.mini .kc{min-width:30px;height:28px;padding:0 6px;font-size:11px;border-radius:7px;box-shadow:0 1.5px 0 #D1D9E8,0 3px 8px rgba(47,86,160,.12)}
.keys.mini .kc.zh{font-size:9px;min-width:26px}
.keys.mini .ar{width:16px;height:16px}
.keys.mini .mouse-ill{height:42px;width:34px}
.keys.mini .dots i{width:4px;height:4px}

/* 场景卡片 */
.scene{position:relative;padding:26px 26px 24px;border:1.5px solid transparent;transition:transform .15s,box-shadow .15s}
.scene.on{background:linear-gradient(180deg,#F1F6FF,#E9F5FD);border-color:#B9CEFF}
.scene:hover{transform:translateY(-2px);box-shadow:0 2px 4px rgba(40,72,140,.06),0 14px 32px rgba(40,72,140,.12)}
.scene h3,.more h3{font-size:19px;margin:0 0 6px}
.scene p,.more p{margin:0;color:var(--sub);font-size:15px;padding-right:48px}
.sw{position:absolute;right:24px;bottom:24px;width:46px;height:28px;border-radius:999px;background:#D5DBE6}
.sw::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:50%;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.22)}
.sw.on{background:var(--primary)}.sw.on::after{left:21px}
.more{padding:26px}
.more p{padding-right:0}
.ic{display:inline-flex;align-items:center;justify-content:center;color:var(--primary)}
.ic svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.more .ic{width:48px;height:48px;border-radius:14px;background:var(--primary-soft);margin-bottom:16px}
.more .ic svg{width:26px;height:26px}

/* 文章卡片（首页） */
.art a{display:block;height:100%}
.art h3{font-size:17px;margin:18px 20px 6px;line-height:1.5}
.art time{display:block;margin:0 20px 20px;color:var(--faint);font-size:13px}
.art:hover h3{color:var(--primary)}

/* 常见问题 */
.faq{display:flex;flex-direction:column;gap:12px}
.faq details{background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:0 22px}
.faq summary{display:flex;align-items:center;gap:12px;padding:18px 0;font-weight:600;font-size:17px;cursor:pointer;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";margin-left:auto;width:9px;height:9px;border-right:2px solid var(--faint);border-bottom:2px solid var(--faint);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg)}
.faq details p{margin:-4px 0 20px 34px;color:var(--sub)}

/* 下载横幅 */
.dl-band{display:flex;align-items:center;gap:28px;padding:40px 44px;border-radius:24px;color:#fff;
  background:radial-gradient(600px 300px at 90% 0,rgba(94,211,243,.55),transparent 70%),linear-gradient(120deg,#2F6BFF,#4A80FF);box-shadow:0 20px 50px rgba(47,107,255,.3)}
.dl-band h2{margin:0 0 4px;font-size:30px}
.dl-band p{margin:0;opacity:.9}

/* 页脚 */
.foot{border-top:1px solid var(--line);background:rgba(255,255,255,.6)}
.foot-in{display:flex;align-items:center;gap:24px;padding:28px 24px;font-size:13px;color:var(--sub)}
.foot-in p{margin:0;flex:1}
.foot-in p a:hover,.foot-links a:hover{color:var(--primary)}
.foot-links{display:flex;gap:20px}
.to-top{position:fixed;right:28px;bottom:28px;z-index:30;width:46px;height:46px;border-radius:50%;border:0;background:#fff;color:var(--primary);box-shadow:var(--shadow);cursor:pointer;display:flex;align-items:center;justify-content:center}
.to-top svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.to-top:hover{box-shadow:0 10px 28px rgba(40,72,140,.2)}

/* ===== 文章页（C 教程内容风） ===== */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px;color:var(--faint)}
.crumbs a:hover{color:var(--primary)}
.crumbs [aria-current]{color:var(--sub)}
.search{display:flex;align-items:center;gap:10px;max-width:640px;height:54px;padding:0 20px;background:#fff;border-radius:999px;box-shadow:var(--shadow),0 0 0 1.5px #D6E2FF}
.search:focus-within{box-shadow:var(--shadow),0 0 0 2px var(--primary)}
.search svg{width:20px;height:20px;fill:none;stroke:var(--faint);stroke-width:2;stroke-linecap:round}
.search input{flex:1;border:0;outline:0;background:none;font:inherit;font-size:16px;color:var(--text)}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:24px;align-items:start;padding-bottom:88px}
.col-main{display:flex;flex-direction:column;gap:24px}
.col-side{display:flex;flex-direction:column;gap:20px;position:sticky;top:92px}
.block{padding:22px 24px}
.block-head h2,.side-faq h2,.toc h2{display:flex;align-items:center;gap:8px;font-size:19px;margin:0 0 14px}
.ic.hot{color:#F26B3A}
.tut-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.tut-list a,.art-list a{display:flex;align-items:center;gap:16px;padding:12px 14px;border-radius:12px;transition:background .15s}
.tut-list a{border:1px solid var(--line)}
.tut-list a:hover,.art-list a:hover{background:#F3F7FF}
.tut-list a:hover b,.art-list a:hover b{color:var(--primary)}
.tut-list .no{width:28px;height:28px;flex:none;border-radius:50%;background:var(--primary);color:#fff;font-weight:700;font-size:14px;display:flex;align-items:center;justify-content:center}
.tt{flex:1;min-width:0;display:flex;flex-direction:column}
.tt b{font-size:16px;line-height:1.5}
.tt span{font-size:13.5px;color:var(--sub);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.tut-list svg:last-child{width:18px;height:18px;fill:none;stroke:var(--faint);stroke-width:2}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.tabs button{border:0;border-radius:999px;padding:7px 18px;font:inherit;font-size:14px;background:#EEF1F7;color:#4A5468;cursor:pointer}
.tabs button[aria-selected=true]{background:var(--primary);color:#fff;font-weight:600}
.art-list{list-style:none;margin:0;padding:0}
.art-list li+li{border-top:1px solid var(--line)}
.art-list time{flex:none;color:var(--faint);font-size:13px}
.empty{color:var(--sub);text-align:center;padding:24px 0;margin:0}
.empty a{color:var(--primary)}
.side-dl{padding:28px 24px;text-align:center;display:flex;flex-direction:column;align-items:center}
.side-dl h2{margin:12px 0 2px;font-size:21px}
.side-dl p{margin:0 0 18px;color:var(--sub);font-size:14px}
.side-dl p.muted{margin:10px 0 0;font-size:13px;color:var(--faint)}
.side-faq{padding:20px 22px}
.side-faq ul{list-style:none;margin:0;padding:0}
.side-faq li+li{border-top:1px solid var(--line)}
.side-faq a{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:11px 0;font-size:14.5px}
.side-faq a:hover{color:var(--primary)}
.side-faq a svg{width:16px;height:16px;fill:none;stroke:var(--faint);stroke-width:2}

/* 文章详情 */
.art-layout{padding-top:32px}
.post{padding:32px 44px 40px}
.post-head{margin:22px 0 26px;padding-bottom:22px;border-bottom:1px solid var(--line)}
.tag{display:inline-block;padding:3px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:13px;font-weight:600}
.post-head h1{font-size:34px;line-height:1.35;margin:12px 0 10px}
.meta{margin:0;color:var(--faint);font-size:14px}
.prose{font-size:17px;line-height:1.9;color:#2A3346}
.prose>p:first-child{margin-top:0;font-size:18px;color:var(--text);background:linear-gradient(90deg,#F1F6FF,#F2FBFE);border-left:4px solid var(--primary);padding:16px 20px;border-radius:0 12px 12px 0}
.prose h2{font-size:24px;margin:40px 0 14px;color:var(--text)}
.prose h3{font-size:19px;margin:28px 0 10px}
.prose ol,.prose ul{padding-left:1.4em}
.prose li{margin:6px 0}
.prose li::marker{color:var(--primary);font-weight:700}
.prose strong{color:var(--text)}
.prose a{color:var(--primary);text-decoration:underline;text-underline-offset:3px}
.prose kbd{display:inline-block;padding:0 8px;margin:0 2px;border-radius:6px;background:linear-gradient(180deg,#fff,#EBF0F8);box-shadow:0 1.5px 0 #D1D9E8;color:var(--primary);font:600 14px/1.8 inherit}
.tip{margin:20px 0;padding:14px 18px;border-radius:12px;background:#FFF7E8;border:1px solid #FFE2B0;color:#7A4B00;font-size:15.5px}
.tip p{margin:0}
.post-cta{display:flex;align-items:center;gap:16px;margin:40px 0 0;padding:22px 26px;border-radius:16px;background:linear-gradient(120deg,#E8EFFF,#E3F6FD)}
.post-cta b{display:block;font-size:18px}
.post-cta span{color:var(--sub);font-size:14px}
.related{margin-top:36px}
.related h2{font-size:20px;margin:0 0 14px}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.related a{display:flex;flex-direction:column;gap:10px;padding:12px;border-radius:12px;border:1px solid var(--line);font-size:15px;font-weight:600;line-height:1.5;height:100%}
.related a:hover{border-color:#9DBBFF;color:var(--primary)}
.related .keys.mini{width:100%}
.toc{padding:20px 22px}
.toc ol{margin:0;padding-left:1.3em;font-size:14.5px;color:var(--sub)}
.toc li{margin:8px 0}
.toc a:hover{color:var(--primary)}

/* 手机和窄屏 */
@media (max-width:960px){
  .grid3{grid-template-columns:1fr 1fr}
  .layout{grid-template-columns:1fr}
  .col-side{position:static}
  .related ul{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .wrap{padding:0 16px}
  .menu{display:none}
  .top-in{justify-content:space-between}
  .hero{padding:44px 0 8px}
  .hero h1{font-size:36px}
  .lead{font-size:16px}
  .shot{margin-top:36px;border-radius:10px}
  .win-bar{display:none}
  .grid3,.related ul{grid-template-columns:1fr}
  .sec{padding-top:52px}
  .sec-head h2{font-size:26px}
  .dl-band{flex-direction:column;text-align:center;padding:32px 22px}
  .foot-in{flex-direction:column;text-align:center}
  .hero-sm h1{font-size:28px}
  .post{padding:22px 18px 28px}
  .post-head h1{font-size:26px}
  .prose{font-size:16px}
  .art-list time{display:none}
  .tut-list .keys.mini{display:none}
  .art-list .keys.mini{width:72px;height:48px}
  .art-list .keys.mini .kc{min-width:24px;padding:0 4px;font-size:10px}
  .tut-list a,.art-list a{gap:12px;padding:12px 10px}
  .layout{padding-bottom:56px}
  .post-cta{flex-direction:column;align-items:flex-start}
  .to-top{right:16px;bottom:16px}
}

/* 导航：手机菜单（窄于 860px 时一排导航换成菜单按钮） */
.top-in{position:relative}
.menu-btn{display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;align-items:center;justify-content:center;cursor:pointer;color:#3A4458;flex:none}
.menu-btn svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round}
.mnav{display:none;position:absolute;left:0;right:0;top:100%;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 18px 40px rgba(30,50,100,.14);padding:8px 16px 16px}
.mnav.open{display:block}
.mnav a{display:flex;align-items:center;justify-content:space-between;min-height:48px;padding:0 6px;border-bottom:1px solid #F0F3F8;font-size:16px;color:#3A4458}
.mnav a[aria-current]{color:var(--primary);font-weight:600}
.mnav a.btn{margin-top:14px;justify-content:center;color:#fff;border:0}
@media (max-width:860px){.menu{display:none}.menu-btn{display:inline-flex}.top-in{gap:12px}.top-in>.btn-sm{margin-left:auto}}
/* 场景卡：有教程的整张卡可点，没有的不浮起 */
a.scene{display:block;color:inherit}
.scene.still:hover,.scene.win:hover{transform:none;box-shadow:var(--shadow)}
.scene .go{display:inline-flex;align-items:center;gap:4px;margin-top:14px;font-size:14px;color:var(--primary);font-weight:600}
.scene .go svg{width:14px;height:14px}
.scene .tag{position:absolute;top:18px;right:18px;font-size:12px;padding:2px 10px;border-radius:999px;background:#EEF2F8;color:var(--sub)}
.scene.win{background:linear-gradient(180deg,#F5F7FB,#EEF2F8);border:1.5px dashed #C9D6EE}
.scene p{padding-right:0}
/* 下载区：Mac 版、Windows 版两块 */
.dl-band.dl-two{display:block}
.dl-two .dl-head{display:flex;align-items:center;gap:20px}
.dl-two .dl-head h2{margin:0 0 4px}
.dl-two .dl-head p{margin:0;opacity:.85}
.dl2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:22px}
.dl2 .pf{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);border-radius:16px;padding:20px 22px;color:#fff}
.dl2 .pf h3{margin:0 0 4px;font-size:20px}
.dl2 .pf p{margin:0 0 14px;opacity:.85;font-size:14px}
@media (max-width:640px){.dl2{grid-template-columns:1fr}}