@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&family=Work+Sans:wght@300;400;500;600;700&display=swap');

:root{
  --ink:#0F1B2D;
  --ink2:#152740;
  --ink3:#1C3352;
  --hot:#FF5A36;
  --hot2:#FF7454;
  --paper:#F2F0E9;
  --mute:#A9B4C4;
  --body:#DCE3EC;
  --line:rgba(242,240,233,.15);
  --edge:clamp(16px,4vw,44px);
  --maxw:1120px;
}
*,*::before,*::after{box-sizing:border-box;border-radius:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:hidden}
body{
  margin:0;
  background-color:var(--ink);
  background-image:radial-gradient(rgba(242,240,233,.09) 1px,transparent 1px);
  background-size:18px 18px;
  color:var(--paper);
  font-family:"Outfit","Work Sans",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:3px solid var(--hot);outline-offset:3px}

/* 顶部：品牌行 + 菜单行 */
.topbar{position:sticky;top:0;z-index:30;background:var(--ink);border-bottom:2px solid var(--hot)}
.brandrow{display:flex;align-items:center;max-width:var(--maxw);margin:0 auto;padding:8px var(--edge);border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center;gap:12px;min-height:44px;font-size:20px;font-weight:700;letter-spacing:.01em}
.brand .mark{width:24px;height:24px;background:var(--hot);flex:none;object-fit:cover}
.brand:hover .brandname{color:var(--hot)}

.nav{max-width:var(--maxw);margin:0 auto;padding:0 var(--edge)}
.nav ol{list-style:none;margin:0;padding:0;display:flex;gap:2px;overflow-x:auto;scrollbar-width:none}
.nav ol::-webkit-scrollbar{display:none}
.nav li{position:relative;flex:none}
.nav a{display:flex;align-items:center;min-height:44px;padding:10px 14px;font-size:16px;font-weight:600;color:var(--mute);transition:color .15s ease,background-color .15s ease}
.nav a:hover,.nav a:focus-visible{color:var(--paper);background:var(--ink3)}
.nav li.has-sub>a::after{content:"";width:7px;height:7px;margin-left:10px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px)}
.nav .sub{position:absolute;left:0;top:100%;display:block;min-width:186px;padding:4px;background:var(--ink3);border:2px solid var(--hot);opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .15s ease,transform .15s ease,visibility .15s;z-index:40}
.nav li.has-sub:hover>.sub,.nav li.has-sub:focus-within>.sub{opacity:1;visibility:visible;transform:translateY(0)}
.nav .sub a{font-weight:500;color:var(--paper)}
.nav .sub li+li a{border-top:1px solid var(--line)}

.shell{max-width:var(--maxw);margin:0 auto;padding:0 var(--edge)}

/* Hero */
.hero{display:grid;grid-template-columns:1.06fr .94fr;gap:clamp(20px,4vw,54px);align-items:center;min-height:45vh;padding:clamp(26px,4.6vw,52px) 0;border-bottom:1px solid var(--line)}
.hero-copy{min-width:0}
.hero h1{margin:0 0 14px;font-size:clamp(28px,4.8vw,50px);line-height:1.1;letter-spacing:-.02em;font-weight:700}
.lead{margin:0 0 24px;max-width:42ch;font-size:clamp(16px,1.4vw,19px);color:var(--mute)}
.cta{display:inline-flex;align-items:center;min-height:48px;padding:12px 28px;background:var(--hot);color:var(--ink);font-size:17px;font-weight:700;transition:background-color .15s ease}
.cta:hover{background:var(--hot2)}
.hero-art{display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(3,1fr);gap:7px;aspect-ratio:4/3;will-change:transform}
.hero-art span{background:var(--ink3)}
.hero-art span:nth-child(1){background:var(--hot)}
.hero-art span:nth-child(6){background:var(--paper)}
.hero-art span:nth-child(9){background:var(--hot)}
.hero-art span:nth-child(11){background:var(--paper)}
.hero-img{aspect-ratio:4/3;object-fit:cover;border:2px solid var(--hot);width:100%;will-change:transform}

/* 内容区：左栏 + 正文 */
.grid{display:grid;grid-template-columns:232px minmax(0,1fr);gap:clamp(24px,4vw,48px);padding:clamp(26px,4vw,46px) 0 4px;align-items:start}
.rail{position:sticky;top:150px;background:var(--ink2);padding:18px 14px;box-shadow:0 8px 22px rgba(0,0,0,.32)}
.rail-title{margin:0 0 10px;font-size:16px;font-weight:600;letter-spacing:.26em;color:var(--hot)}
.rail hr{margin:0 0 16px;border:0;border-top:3px solid var(--hot);width:46px}
.rail-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.rail-list a{display:flex;gap:10px;align-items:baseline;min-height:40px;padding:9px 10px;font-size:16px;color:var(--mute);border-left:2px solid transparent;transition:color .15s ease,background-color .15s ease,border-color .15s ease}
.rail-list a:hover,.rail-list a:focus-visible{color:var(--paper);background:var(--ink3);border-left-color:var(--hot)}
.rail-list .n{font-size:13px;font-weight:700;color:var(--hot);font-variant-numeric:tabular-nums}

/* 正文 */
.body{min-width:0}
.body article[id]{scroll-margin-top:150px;background:rgba(242,240,233,.035);box-shadow:0 6px 18px rgba(0,0,0,.22);border-top:3px solid var(--ink3);padding:clamp(18px,3vw,28px);margin-bottom:clamp(20px,3vw,30px)}
.body article:first-child{border-top-color:var(--hot)}
.body h2{margin:.1em 0 .2em;font-size:clamp(23px,3.2vw,33px);line-height:1.22;font-weight:700;letter-spacing:-.01em}
.body h2::before{content:"";display:inline-block;width:14px;height:14px;background:var(--hot);margin-right:12px;vertical-align:middle}
.body h3{margin:1.5em 0 .4em;font-size:clamp(19px,2.2vw,23px);font-weight:600;line-height:1.3}
.body p{margin:0 0 1.05em;max-width:68ch;color:var(--body)}
.body>article>p:last-child{margin-bottom:0}
.body ul,.body ol{margin:0 0 1.2em;padding-left:1.45em;max-width:66ch}
.body li{margin:.35em 0}
.body a{color:var(--hot);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.body a:hover{color:var(--hot2)}
.body strong,.body b{color:var(--paper);font-weight:600}
.body hr{border:0;border-top:3px solid var(--hot);width:62px;margin:4px 0 22px}
.body blockquote{margin:0 0 1.2em;padding:14px 20px;background:var(--ink2);border-left:5px solid var(--hot)}
.body blockquote p{max-width:none;margin-bottom:.5em}
.body blockquote p:last-child{margin-bottom:0}
.body table{display:block;width:100%;border-collapse:collapse;margin:0 0 1.2em;overflow-x:auto;font-size:16px}
.body th,.body td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.body th{background:var(--ink3);font-weight:600;color:var(--paper)}
.body pre{overflow-x:auto;margin:0 0 1.2em;padding:14px;background:var(--ink2);border-left:4px solid var(--hot);font-size:15px;line-height:1.6}
.body code{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.94em}
.body img{margin:0 0 1.2em;border:2px solid var(--line)}
.body figure{margin:0 0 1.2em}

/* 页脚：单行 */
.foot{margin-top:clamp(28px,5vw,56px);background:var(--ink2);border-top:2px solid var(--hot)}
.foot-inner{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;max-width:var(--maxw);margin:0 auto;padding:18px var(--edge)}
.foot-brand{display:inline-flex;align-items:center;gap:10px;font-size:17px;font-weight:700}
.foot-brand .mark{width:20px;height:20px;background:var(--hot);flex:none;object-fit:cover}
.foot-nav{display:flex;flex-wrap:wrap}
.foot-nav a{display:inline-flex;align-items:center;min-height:44px;padding:10px 8px;font-size:16px;color:var(--mute);transition:color .15s ease}
.foot-nav a:hover{color:var(--hot)}
.copy{margin:0;margin-left:auto;font-size:16px;color:var(--mute)}

.totop{position:fixed;right:14px;bottom:14px;z-index:26;display:inline-flex;align-items:center;min-height:44px;padding:10px 14px;background:var(--hot);color:var(--ink);font-size:16px;font-weight:700;opacity:0;pointer-events:none;transition:opacity .18s ease,background-color .15s ease}
.totop.on{opacity:1;pointer-events:auto}
.totop:hover{background:var(--hot2)}

/* 动效 */
.anim .body article[id]{opacity:0;transform:translateY(16px);transition:opacity .34s ease,transform .34s ease}
.anim .body article.in{opacity:1;transform:none}
.anim .rail-list li{opacity:0;transform:translateX(-8px);transition:opacity .26s ease,transform .26s ease}
.anim .rail-list li.in{opacity:1;transform:none}

@media (max-width:860px){
  .grid{grid-template-columns:1fr;gap:20px}
  .rail{position:static;padding:14px}
  .rail-title{letter-spacing:.2em}
  .rail-list{flex-direction:row;flex-wrap:wrap;gap:4px}
  .rail-list a{min-height:40px;border-left:0;border-bottom:2px solid transparent;padding:8px 10px}
  .rail-list a:hover,.rail-list a:focus-visible{border-left:0;border-bottom-color:var(--hot)}
  .body article[id]{scroll-margin-top:126px}
}

@media (max-width:760px){
  .nav li{display:contents}
  .nav .sub{position:static;display:contents;border:0;padding:0;opacity:1;visibility:visible;transform:none}
  .nav li.has-sub>a::after{display:none}
  .nav .sub li+li a{border-top:0}
  .hero{grid-template-columns:1fr;min-height:0;gap:22px;padding:22px 0 26px}
  .hero-art,.hero-img{aspect-ratio:16/9}
  .lead{max-width:none}
  .foot-inner{padding-bottom:22px}
  .copy{margin-left:0;width:100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .anim .body article[id],.anim .rail-list li{opacity:1;transform:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

button[aria-expanded]{min-width:44px;min-height:44px}