/* ============================================================
   尘牛浏览器 · 下载与功能介绍页样式
   对应页面：index.html（同目录）
   说明：界面截图是真机截图（assets/shot-*.webp），不是 CSS 画的；
        .stage 只是给截图加一圈浅色衬底和阴影。
   分段：基础 → 顶栏 → 按钮 → Hero → 数据条 → 版块 → 通用功能（弱化）
        → 截图 → 共用登录 → 快捷键 → 系统要求 → 下载 CTA → FAQ → 页脚 → 响应式 → 局部变体
   ============================================================ */

/* ============ 基础 ============ */
:root{
  --ink:#0f1319;
  --ink-2:#3e4753;
  --ink-3:#6d7683;
  --ink-4:#98a1ad;
  --line:#e7eaef;
  --line-2:#eef1f5;
  --bg:#ffffff;
  --bg-soft:#f6f7f9;
  --blue:#1a73e8;
  --blue-d:#1257b8;
  --red:#e5432e;
  --yellow:#f3b73c;
  --green:#2fa84f;
  --radius:18px;
  --shadow-s:0 1px 2px rgba(15,23,42,.05), 0 8px 24px -12px rgba(15,23,42,.18);
  --shadow-m:0 24px 60px -28px rgba(15,23,42,.28), 0 2px 6px rgba(15,23,42,.05);
  --font:"Segoe UI","Microsoft YaHei UI","Microsoft YaHei","PingFang SC","Hiragino Sans GB",system-ui,-apple-system,sans-serif;
  --mono:"Cascadia Mono",Consolas,"SFMono-Regular",Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  font-size:16px;line-height:1.65;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
h1,h2,h3,h4{margin:0;line-height:1.25;letter-spacing:-.02em;font-weight:700}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
.wrap{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ============ 顶栏 ============ */
.hdr{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .2s ease, box-shadow .2s ease;
}
.hdr.is-stuck{border-bottom-color:var(--line);box-shadow:0 6px 20px -18px rgba(15,23,42,.6)}
.hdr__in{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em;flex-shrink:0}
.brand img{width:30px;height:30px;border-radius:50%}
.brand small{display:block;font-size:11px;font-weight:500;color:var(--ink-4);letter-spacing:0;line-height:1.1}
.brand b{font-size:15px;line-height:1.15;display:block}
.nav{display:flex;gap:26px;margin-left:auto}
.nav a{font-size:14.5px;color:var(--ink-2);font-weight:500;transition:color .15s}
.nav a:hover{color:var(--blue)}
.hdr__cta{display:flex;align-items:center;gap:10px;margin-left:6px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:44px;padding:0 20px;border-radius:12px;font-size:15px;font-weight:600;
  white-space:nowrap;transition:transform .15s ease, box-shadow .2s ease, background .2s ease;
}
.btn:active{transform:translateY(1px)}
.btn--primary{
  color:#fff;background:linear-gradient(180deg,#2c82f0,#1465d6);
  box-shadow:0 10px 24px -12px rgba(26,115,232,.75), inset 0 1px 0 rgba(255,255,255,.28);
}
.btn--primary:hover{background:linear-gradient(180deg,#3a8cf6,#1668dd);box-shadow:0 14px 30px -12px rgba(26,115,232,.85), inset 0 1px 0 rgba(255,255,255,.3)}
.btn--sm{height:38px;padding:0 16px;font-size:14px;border-radius:10px}
.btn--ghost{color:var(--ink);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-s)}
.btn--ghost:hover{border-color:#d2d8e0;background:#fcfcfd}
.btn--xl{height:58px;padding:0 30px;font-size:17px;border-radius:14px}
.btn--dark{background:#141a22;color:#fff;box-shadow:0 10px 24px -14px rgba(0,0,0,.8)}
.btn--dark:hover{background:#1c2530}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:#0b0e13;
  padding:76px 0 88px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    radial-gradient(60% 55% at 78% 12%,rgba(26,115,232,.30),transparent 62%),
    radial-gradient(45% 45% at 92% 62%,rgba(47,168,79,.20),transparent 60%),
    radial-gradient(40% 40% at 8% 88%,rgba(229,67,46,.25),transparent 62%),
    radial-gradient(48% 40% at 30% -8%,rgba(243,183,60,.16),transparent 60%);
  pointer-events:none;
}
.hero::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(70% 60% at 50% 30%,#000,transparent 78%);
  -webkit-mask-image:radial-gradient(70% 60% at 50% 30%,#000,transparent 78%);
  pointer-events:none;
}
.hero__in{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.06fr);gap:56px;align-items:center}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  height:32px;padding:0 14px 0 10px;border-radius:999px;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.13);
  font-size:13px;font-weight:500;color:#cfd8e6;
}
.eyebrow i{
  width:18px;height:18px;border-radius:50%;flex-shrink:0;
  background:conic-gradient(from 180deg,#1a73e8 0 25%,#e5432e 0 50%,#f3b73c 0 75%,#2fa84f 0);
}
.hero h1{
  margin:22px 0 0;font-size:clamp(32px,4.2vw,50px);line-height:1.15;letter-spacing:-.035em;font-weight:800;
}
.hero h1 em{
  font-style:normal;
  background:linear-gradient(96deg,#8ec2ff 0%,#7ff0c0 46%,#ffd97a 100%);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero__sub{
  margin-top:22px;max-width:33em;font-size:16.5px;line-height:1.8;color:#aab6c6;
}
.hero__sub b{color:#e8eef7;font-weight:600}

/* 下载模块 */
.dl{margin-top:32px}
.dl__row{display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.dl__os{
  display:flex;flex-direction:column;gap:5px;font-size:13px;color:#9fabbb;line-height:1.3;
}
.dl__os strong{display:flex;align-items:center;gap:7px;font-size:14px;font-weight:600;color:#e6edf6}
.dl__os strong svg{color:#9ec5ff}
.dl__os span{color:#8d99a9}
.dl__link{display:flex;align-items:center;gap:8px;margin-top:20px;font-size:13px;color:#8b97a7;min-width:0}
.dl__link code{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-family:var(--mono);font-size:12px;color:#b9c6d8;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);padding:2px 8px;border-radius:6px}
.dl__link > span{flex-shrink:0}
.plat{display:flex;gap:6px;flex-wrap:wrap;margin-top:20px}
.plat li{
  display:inline-flex;align-items:center;gap:6px;height:30px;padding:0 10px;border-radius:8px;
  font-size:12px;font-weight:500;color:#dbe4f0;
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);
}
.plat li::before{content:"";width:6px;height:6px;border-radius:50%;background:#2fbf62;box-shadow:0 0 0 3px rgba(47,191,98,.16)}
.plat li.off{color:#7c8899;background:transparent;border-color:rgba(255,255,255,.08)}
.plat li.off::before{background:#5c6673;box-shadow:none}

/* Hero 右侧产品图 */
.art{position:relative}
.art__shot{
  position:relative;z-index:1;display:block;width:100%;height:auto;border-radius:16px;
  box-shadow:0 40px 90px -34px rgba(12,20,34,.6), 0 0 0 1px rgba(255,255,255,.1), 0 6px 18px rgba(8,14,24,.28);
}
.art__glow{
  position:absolute;inset:-8% -6% -14% -6%;z-index:0;filter:blur(38px);opacity:.75;
  background:radial-gradient(45% 45% at 30% 20%,rgba(26,115,232,.5),transparent 70%),
             radial-gradient(40% 40% at 78% 72%,rgba(243,183,60,.28),transparent 70%);
}

/* ============ 数据条 ============ */
.facts{border-bottom:1px solid var(--line);background:#fff}
.facts__in{display:grid;grid-template-columns:repeat(5,1fr);gap:0}
.fact{padding:26px 22px;border-left:1px solid var(--line-2)}
.fact:first-child{border-left:0}
.fact b{display:block;font-size:20px;letter-spacing:-.02em}
.fact span{display:block;margin-top:3px;font-size:13px;color:var(--ink-3)}

/* ============ 通用 section ============ */
.sec{padding:88px 0}
.sec--soft{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec__hd{max-width:660px}
.sec__hd.center{margin-inline:auto;text-align:center}
.kicker{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;color:var(--blue);
  letter-spacing:.02em;
}
.kicker::before{content:"";width:16px;height:2px;border-radius:2px;background:currentColor}
.sec h2{margin-top:14px;font-size:clamp(26px,3vw,36px);letter-spacing:-.03em}
.sec__sub{margin-top:16px;font-size:16px;color:var(--ink-3);line-height:1.8}

/* 功能卡片 */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
.card{
  padding:28px 26px 26px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow-s);transition:transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-m);border-color:#dbe1e9}
.card__ic{
  width:44px;height:44px;border-radius:13px;display:grid;place-items:center;
  background:#eff4fe;color:#1a73e8;margin-bottom:18px;
}
.card__ic svg{width:22px;height:22px}
.card:nth-child(3n+2) .card__ic{background:#f0f8f2;color:#2b9b4d}
.card:nth-child(3n+3) .card__ic{background:#fdf5e8;color:#c98a12}
.card h3{font-size:17.5px;letter-spacing:-.01em}
.card p{margin-top:9px;font-size:14.5px;color:var(--ink-3);line-height:1.75}
.card p b{color:var(--ink-2);font-weight:600}
.card code{font-family:var(--mono);font-size:12.5px;background:#f3f5f8;border:1px solid var(--line);border-radius:5px;padding:1px 5px}

/* 通用功能：一块带过（弱化呈现，不占卡片） */
.vanilla{
  margin-top:22px;padding:26px 28px 22px;border:1px solid var(--line);border-radius:var(--radius);
  background:#fbfcfd;
}
.vanilla__hd h3{font-size:16px;letter-spacing:-.01em}
.vanilla__hd p{margin-top:8px;font-size:14px;color:var(--ink-3);line-height:1.7}
.vanilla__tag{
  display:inline-block;margin-left:8px;padding:1px 8px;border-radius:999px;
  font-size:11.5px;font-weight:600;letter-spacing:0;vertical-align:2px;
  color:var(--ink-3);background:#eef1f5;border:1px solid var(--line);
}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chips li{
  display:inline-flex;align-items:center;gap:7px;
  padding:7px 13px;border-radius:999px;font-size:13px;line-height:1.5;color:var(--ink-2);
  background:#fff;border:1px solid var(--line);
}
.chips li::before{content:"";width:5px;height:5px;border-radius:50%;background:#b9c2ce;flex-shrink:0}
details.vmore{margin-top:20px;border-top:1px solid var(--line);padding-top:4px}
details.vmore summary{
  list-style:none;cursor:pointer;position:relative;padding:14px 34px 12px 0;
  font-size:14px;font-weight:600;color:var(--ink-2);
}
details.vmore summary::-webkit-details-marker{display:none}
details.vmore summary::after{
  content:"";position:absolute;right:8px;top:50%;width:8px;height:8px;
  border-right:1.7px solid var(--ink-4);border-bottom:1.7px solid var(--ink-4);
  transform:translateY(-70%) rotate(45deg);transition:transform .2s ease;
}
details.vmore[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
details.vmore summary:hover{color:var(--ink)}
details.vmore .keys{margin-top:6px}

/* ============ 截图 ============ */
.shots{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:44px;align-items:start}
.shot{margin:0;display:flex;flex-direction:column;min-width:0}
.stage{
  min-width:0;padding:16px;
  background:linear-gradient(180deg,#f7f9fc,#edf1f6);
  border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-s);
}
.stage img{
  display:block;width:100%;height:auto;border-radius:10px;
  box-shadow:0 14px 30px -16px rgba(15,23,42,.42), 0 0 0 1px rgba(15,23,42,.05);
}
.shot figcaption{margin-top:14px;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.shot figcaption b{font-size:15px;font-weight:600}
.shot figcaption span{font-size:13.5px;color:var(--ink-3)}

/* ============ 共用登录（左文右图） ============ */
.split{display:grid;grid-template-columns:1fr 1.02fr;gap:52px;align-items:center;margin-top:8px}
.split__copy{min-width:0}
.split h2{margin-top:14px;font-size:clamp(26px,3vw,36px);letter-spacing:-.03em}
.split .sec__sub{margin-top:16px}
.split .shot{margin-top:0;min-width:0}
.split .stage{padding:16px}
.bullets{margin-top:24px;display:flex;flex-direction:column;gap:14px}
.bullets li{position:relative;padding-left:28px;font-size:14.5px;line-height:1.78;color:var(--ink-2)}
.bullets li::before{
  content:"";position:absolute;left:0;top:.42em;width:17px;height:17px;
  border-radius:6px;background:#eaf2fe;box-shadow:inset 0 0 0 1px #d7e6fc;
}
.bullets li::after{
  content:"";position:absolute;left:5px;top:.74em;width:7px;height:4px;
  border-left:1.8px solid #1a73e8;border-bottom:1.8px solid #1a73e8;transform:rotate(-45deg);
}
.bullets li b{color:var(--ink);font-weight:600}
.bullets code{
  font-family:var(--mono);font-size:12.5px;background:#fff;
  border:1px solid var(--line);border-radius:5px;padding:1px 5px;
}
.note-inline{
  margin-top:22px;padding:14px 16px;border-radius:12px;background:#fff;
  border:1px solid var(--line);font-size:13.5px;line-height:1.75;color:var(--ink-3);
}

/* ============ 快捷键 ============ */
.keys{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px;align-items:stretch}
.keygroup{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 22px 20px;box-shadow:var(--shadow-s);min-width:0;
}
.keygroup h3{font-size:15px;letter-spacing:-.01em}
.keygroup ul{margin-top:14px;display:flex;flex-direction:column;gap:11px}
.keygroup li{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  font-size:13.5px;color:var(--ink-3);
}
.kbd-set{display:inline-flex;align-items:center;gap:4px;flex-shrink:0}
kbd{
  font-family:var(--mono);font-size:11.5px;line-height:1;padding:5px 6px;border-radius:6px;
  background:#f5f7fa;border:1px solid var(--line);box-shadow:0 1px 0 #e5e9ef;
  color:var(--ink-2);white-space:nowrap;
}
.keygroup--note{background:#fbfcfd;box-shadow:none}
.keygroup--note ul.notes{gap:10px}
.keygroup--note li{
  display:block;position:relative;padding-left:14px;font-size:13px;line-height:1.72;
}
.keygroup--note li::before{
  content:"";position:absolute;left:2px;top:.62em;width:5px;height:5px;border-radius:50%;background:#c9d0da;
}
.keygroup--note b{color:var(--ink-2);font-weight:600}

/* ============ 系统要求 ============ */
.spec{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:start;margin-top:44px}
.spec__tbl{margin:0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-s)}
.spec__row{display:grid;grid-template-columns:130px 1fr;gap:16px;padding:16px 22px;border-bottom:1px solid var(--line-2);font-size:14.5px}
.spec__row:last-child{border-bottom:0}
.spec__row dt{color:var(--ink-3)}
.spec__row dd{margin:0;color:var(--ink);font-weight:500}
.spec__row dd code{font-family:var(--mono);font-size:12.5px;background:#f3f5f8;border:1px solid var(--line);border-radius:5px;padding:1px 6px}
.yes{color:#22803f;font-weight:600}
.no{color:#b4442f;font-weight:600}
.panel-note{padding:26px 28px;border-radius:var(--radius);background:#fff;border:1px solid var(--line);box-shadow:var(--shadow-s)}
.panel-note h3{font-size:16px}
.panel-note ul{margin-top:14px;display:flex;flex-direction:column;gap:11px}
.panel-note li{position:relative;padding-left:20px;font-size:14px;color:var(--ink-3);line-height:1.7}
.panel-note li::before{content:"";position:absolute;left:2px;top:.55em;width:6px;height:6px;border-radius:50%;background:#c9d0da}
.panel-note li b{color:var(--ink-2);font-weight:600}

/* ============ 下载 CTA ============ */
.cta{padding:0 0 96px}
.cta__card{
  position:relative;overflow:hidden;color:#fff;background:#0b0e13;
  border-radius:26px;padding:56px 56px 52px;
  box-shadow:0 40px 80px -50px rgba(15,23,42,.8);
}
.cta__card::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(50% 70% at 12% 8%,rgba(26,115,232,.34),transparent 62%),
    radial-gradient(45% 60% at 92% 95%,rgba(47,168,79,.22),transparent 62%),
    radial-gradient(40% 50% at 70% 0%,rgba(243,183,60,.14),transparent 60%);
}
.cta__in{position:relative;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.cta h2{font-size:clamp(24px,2.6vw,32px);letter-spacing:-.03em}
.cta p.lead{margin-top:14px;color:#a8b4c4;font-size:15.5px;line-height:1.8;max-width:28em}
.cta .dl{margin-top:28px}
.steps{display:flex;flex-direction:column;gap:14px;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:24px 26px}
.steps li{display:flex;gap:14px;align-items:flex-start;font-size:14px;color:#b7c3d3;line-height:1.65}
.steps li i{
  width:22px;height:22px;flex-shrink:0;border-radius:50%;display:grid;place-items:center;
  background:rgba(255,255,255,.1);color:#dce6f5;font-size:11.5px;font-weight:700;font-style:normal;margin-top:2px;
}
.steps li b{color:#eef3fa;font-weight:600}

/* ============ FAQ ============ */
.faq{margin-top:40px;border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  list-style:none;cursor:pointer;padding:22px 40px 22px 0;position:relative;
  font-size:16px;font-weight:600;letter-spacing:-.01em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"";position:absolute;right:6px;top:50%;width:9px;height:9px;
  border-right:1.8px solid var(--ink-4);border-bottom:1.8px solid var(--ink-4);
  transform:translateY(-70%) rotate(45deg);transition:transform .2s ease;
}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq p{padding:0 40px 24px 0;color:var(--ink-3);font-size:14.5px;line-height:1.8}
.faq p b{color:var(--ink-2)}
.faq code{font-family:var(--mono);font-size:13px;background:#f3f5f8;border:1px solid var(--line);border-radius:5px;padding:1px 6px}

/* ============ 页脚 ============ */
.ft{border-top:1px solid var(--line);background:#fbfcfd;padding:48px 0 40px}
.ft__in{display:flex;justify-content:space-between;gap:36px;flex-wrap:wrap}
.ft__brand{display:flex;gap:12px;align-items:flex-start;max-width:340px}
.ft__brand img{width:34px;height:34px;border-radius:50%;margin-top:2px}
.ft__brand b{font-size:15px}
.ft__brand p{margin-top:8px;font-size:13px;color:var(--ink-3);line-height:1.7}
.ft__cols{display:flex;gap:64px;flex-wrap:wrap}
.ft__col h4{font-size:13px;color:var(--ink-4);font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.ft__col ul{margin-top:12px;display:flex;flex-direction:column;gap:9px}
.ft__col a{font-size:13.5px;color:var(--ink-2)}
.ft__col a:hover{color:var(--blue)}
.ft__bar{margin-top:36px;padding-top:20px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-4)}

/* ============ 响应式 ============ */
@media (max-width:1060px){
  .hero__in{grid-template-columns:minmax(0,1fr);gap:44px}
  .hero__copy,.art{min-width:0}
  .art{max-width:760px}
  .grid3{grid-template-columns:repeat(2,1fr)}
  .facts__in{grid-template-columns:repeat(3,1fr)}
  .fact:nth-child(4){border-left:0}
  .fact{border-top:1px solid var(--line-2)}
  .fact:nth-child(-n+3){border-top:0}
  .spec{grid-template-columns:1fr;gap:24px}
  .cta__in{grid-template-columns:minmax(0,1fr);gap:32px}
  .cta__in > *{min-width:0}
  .cta__card{padding:44px 36px}
}
@media (max-width:820px){
  .nav{display:none}
  .shots{grid-template-columns:1fr}
  .sec{padding:64px 0}
  .hero{padding:52px 0 64px}
}
@media (max-width:640px){
  .wrap{width:calc(100% - 32px)}
  .grid3{grid-template-columns:1fr}
  .facts__in{grid-template-columns:repeat(2,1fr)}
  .fact{padding:20px 14px}
  .fact b{font-size:17px}
  .fact span{margin-top:4px;font-size:12.5px}
  .fact:nth-child(odd){border-left:0}
  .fact:nth-child(-n+2){border-top:0}
  .dl__row{gap:14px}
  .btn--xl{width:100%}
  .dl__row{flex-direction:column;align-items:stretch;gap:14px}
  .dl__os{flex-direction:row;flex-wrap:wrap;align-items:center;gap:6px 10px}
  .cta__card{padding:32px 22px;border-radius:20px}
  .spec__row{grid-template-columns:96px 1fr;padding:14px 16px;font-size:14px}
  .stage{padding:16px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important;animation:none!important}
}

/* 入场动画 */
.js .rv{opacity:0;transform:translateY(16px)}
.js .rv.in{opacity:1;transform:none;transition:opacity .6s cubic-bezier(.22,.61,.36,1),transform .6s cubic-bezier(.22,.61,.36,1)}

/* ============ 局部变体与工具类 ============
   放在文件末尾：这些规则用于覆盖组件基础样式或响应式断点，必须最后生效。 */

/* 字重（下载按钮里的版本号） */
.fw6{font-weight:600}

/* 版块间距微调 */
.sec--pb0{padding-bottom:0}
.sec--faqp{padding-top:76px}

/* 深色卡上的「复制链接」按钮 */
.cp--light{
  height:28px;padding:0 10px;font-size:12px;border-radius:7px;
  background:rgba(255,255,255,.06);color:#dbe4f0;
  border-color:rgba(255,255,255,.14);box-shadow:none;
}

/* 卡片正文里的站内链接（指向共用登录 / 快捷键） */
.card p a{
  color:var(--blue);font-weight:500;
  text-decoration:underline;text-decoration-thickness:1px;
  text-decoration-color:rgba(26,115,232,.35);text-underline-offset:3px;
}
.card p a:hover{text-decoration-color:var(--blue)}

/* 卡片标题上的「新」标记 */
.new{
  display:inline-block;margin-left:8px;padding:1px 6px;border-radius:5px;
  font-size:11px;font-weight:600;line-height:1.5;letter-spacing:0;vertical-align:2px;
  color:#1257b8;background:#eaf2fe;border:1px solid #d5e5fb;
}

/* 共用登录 / 快捷键 的断点（放在末尾以便覆盖上面的默认值） */
@media (max-width:1060px){
  .split{grid-template-columns:minmax(0,1fr);gap:34px}
  .split .shot{max-width:620px}
  .keys{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:640px){
  .keys{grid-template-columns:1fr}
  .bullets li{font-size:14px}
  .keygroup{padding:18px}
  .kbd-set kbd{padding:5px}
}