/* ==========================================================================
   Clash免费下载 · 设计系统基座(base.css)
   分层:设计令牌 → 重置 → 排版 → 布局 → 按钮 → 头部导航 → 页脚 → Hero 首屏 → 工具类 → 响应式 → 动效降级
   视觉基准:用户拍板的首屏稿(地平线光轨跑道 + 动态大字入场),此处仅做工程化重组,不改视觉结果。
   ========================================================================== */

/* ============ 设计令牌(全站唯一颜色来源) ============ */
:root{
  /* 底色与面板层级 */
  --bg:#070A16;
  --bg-panel:#0D1226;
  --bg-panel2:#141B36;
  /* 描边 */
  --border:#26304F;
  --border-soft:rgba(38,48,79,.6);
  /* 主色:品红 → 桃红 */
  --accent:#FF4F9A;
  --accent-2:#FF9E7D;
  --accent-dark:#C71F77;
  --peach-bright:#FFD9C8;
  --on-accent:#2B0A1F;
  /* 文字 */
  --text:#F2F5FF;
  --text-muted:#8E97B8;
  /* 语义色 */
  --success:#3ED598;
  --warn:#FFB54D;
  --error:#FF5C6C;
  --success-10:rgba(62,213,152,.10);
  --warn-10:rgba(255,181,77,.10);
  --error-10:rgba(255,92,108,.10);
  --success-glow:rgba(62,213,152,.8);
  /* 主色透明度阶梯 */
  --accent-04:rgba(255,79,154,.04);
  --accent-08:rgba(255,79,154,.08);
  --accent-10:rgba(255,79,154,.10);
  --accent-12:rgba(255,79,154,.12);
  --accent-18:rgba(255,79,154,.18);
  --accent-28:rgba(255,79,154,.28);
  --accent-35:rgba(255,79,154,.35);
  --accent-55:rgba(255,79,154,.55);
  --accent-dark-40:rgba(199,31,119,.4);
  --peach-20:rgba(255,158,125,.20);
  --peach-30:rgba(255,158,125,.30);
  --peach-55:rgba(255,158,125,.55);
  --peach-85:rgba(255,158,125,.85);
  /* 氛围与特效 */
  --panel-55:rgba(13,18,38,.55);
  --bg-80:rgba(7,10,22,.82);
  --shade-top:rgba(7,10,22,.55);
  --vignette:rgba(4,6,14,.5);
  --veil:rgba(4,6,14,.66);
  --shadow-deep:rgba(3,5,12,.55);
  --sheen:rgba(255,255,255,.3);
  --sheen-strong:rgba(255,255,255,.5);
  --grid-v:rgba(255,79,154,.30);
  --grid-h:rgba(255,158,125,.55);
  /* 字体 */
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  /* 布局 */
  --wrap:1280px;
  --gutter:28px;
  --header-h:64px;
  /* 圆角 */
  --r-s:10px;
  --r-m:16px;
  --r-l:22px;
  --r-xl:28px;
  --r-pill:999px;
  /* 动效 */
  --ease-out:cubic-bezier(.16,.8,.26,1);
}
@media (max-width:640px){
  :root{--gutter:16px}
}

/* ============ 重置 ============ */
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
article,aside,figcaption,figure,footer,header,main,nav,section{display:block}
img{max-width:100%;height:auto}
button{font:inherit}
input,select,textarea{font:inherit}
ul,ol{margin:0 0 1em;padding-left:1.4em}
li{line-height:1.8}
hr{border:0;height:1px;margin:2.2em 0;background:linear-gradient(90deg,transparent,var(--border),transparent)}

/* ============ 基础 ============ */
html{
  scroll-behavior:smooth;
  scrollbar-width:thin;
  scrollbar-color:var(--border) var(--bg);
}
html.nav-open{overflow:hidden}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:var(--accent-2);text-decoration:none;transition:color .2s}
a:hover{color:var(--text)}
::selection{background:var(--accent-35);color:var(--text)}
a:focus-visible,button:focus-visible,summary:focus-visible{
  outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;
}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:6px}
/* 锚点偏移:给 sticky 头部留位 */
[id]{scroll-margin-top:calc(var(--header-h) + 18px)}

/* ============ 排版 ============ */
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;margin:0 0 .6em;letter-spacing:.01em}
h1{font-size:clamp(34px,4.6vw,52px);font-weight:900;line-height:1.15}
h2{font-size:clamp(26px,3.2vw,38px);font-weight:800}
h3{font-size:clamp(19px,2vw,24px);font-weight:700}
h4{font-size:17px;font-weight:700}
p{margin:0 0 1em}
strong{color:var(--text);font-weight:600}
small{font-size:12.5px;color:var(--text-muted)}
/* 行内代码:超长串(订阅 URL / 文件名)必须可断行,防窄屏撑破 */
code{
  font-family:var(--font-mono);font-size:.88em;
  background:var(--accent-08);border:1px solid var(--border-soft);border-radius:6px;
  padding:.12em .42em;overflow-wrap:anywhere;word-break:break-word;
}
pre{
  font-family:var(--font-mono);font-size:13.5px;line-height:1.75;
  background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-m);
  padding:18px 20px;margin:1.2em 0;max-width:100%;
  overflow-x:auto;-webkit-overflow-scrolling:touch;
}
pre code{background:none;border:0;padding:0;font-size:inherit;overflow-wrap:normal;word-break:normal}
blockquote{
  margin:1.4em 0;padding:16px 22px;
  border-left:3px solid var(--accent);border-radius:0 var(--r-m) var(--r-m) 0;
  background:var(--accent-04);color:var(--text-muted);
}
blockquote p:last-child{margin-bottom:0}

/* 正文排版(教程/文章/深文档) */
.prose{max-width:100%}
.prose h2{margin:2.2em 0 .8em;font-size:clamp(23px,2.6vw,30px)}
.prose h3{margin:1.8em 0 .6em}
.prose p{margin:0 0 1.1em;line-height:1.9}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.5em}
.prose li{margin-bottom:.45em;line-height:1.85}
.prose li::marker{color:var(--accent-2)}
.prose a{color:var(--accent-2);text-decoration:underline;text-decoration-color:var(--accent-28);text-underline-offset:3px}
.prose a:hover{color:var(--text);text-decoration-color:var(--accent-2)}
.prose img{border-radius:var(--r-m)}

/* ============ 布局 ============ */
/* 版心:任何断点都保留左右内边距,严禁贴边 */
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
/* 区块节奏:只声明纵向 padding,禁止横向简写清零 */
.sec{position:relative;padding-top:88px;padding-bottom:88px}
.sec-sm{padding-top:56px;padding-bottom:56px}
/* 装饰溢出保险:带绝对定位装饰的区块加 .clip-x */
.clip-x{overflow-x:clip}
/* 区块氛围光(装饰,不伪装数据) */
.sec-glow{overflow-x:clip}
.sec-glow::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(720px 320px at 85% 0%,var(--accent-08),transparent 70%);
}
.sec-head{max-width:760px;margin-bottom:46px}
.sec-head.center{margin-inline:auto;text-align:center}
.sec-kicker{
  display:flex;align-items:center;gap:12px;margin:0 0 16px;
  font:500 11px/1 var(--font-mono);letter-spacing:.3em;color:var(--accent-2);
}
.sec-kicker::before{
  content:"";width:26px;height:1px;flex:none;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  box-shadow:0 0 8px var(--accent-55);
}
.sec-head.center .sec-kicker{justify-content:center}
.sec-head.center .sec-kicker::after{
  content:"";width:26px;height:1px;flex:none;
  background:linear-gradient(90deg,var(--accent-2),var(--accent));
  box-shadow:0 0 8px var(--accent-55);
}
.sec-title{margin:0 0 14px;font-size:clamp(26px,3.4vw,38px);font-weight:800}
.sec-desc{margin:0;color:var(--text-muted);font-size:15px;line-height:1.85}
/* 通用网格 */
.grid-2,.grid-3,.grid-4{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-2>*,.grid-3>*,.grid-4>*{min-width:0}
.row-flex{display:flex;flex-wrap:wrap;gap:16px;align-items:center}

/* ============ 面板 / 卡片基座 ============ */
.panel{
  position:relative;border:1px solid var(--border);border-radius:var(--r-l);
  background:linear-gradient(180deg,var(--bg-panel),var(--bg));
  box-shadow:inset 0 1px 0 var(--sheen);
}
.panel-glow{
  border-color:var(--accent-18);
  box-shadow:0 24px 60px -30px var(--accent-28),inset 0 1px 0 var(--sheen);
}
.panel-pad{padding:30px}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  border:0;border-radius:var(--r-pill);cursor:pointer;text-decoration:none;
  font:700 15px/1 var(--font-display);
  transition:transform .2s,box-shadow .25s,border-color .2s,background-color .2s,color .2s;
}
.btn svg{flex:none}
.btn-primary{
  position:relative;overflow:hidden;
  padding:20px 50px;
  font:800 17px/1 var(--font-display);letter-spacing:.04em;
  color:var(--on-accent);
  background:linear-gradient(100deg,var(--accent) 8%,var(--accent-2) 92%);
  box-shadow:
    0 0 0 1px var(--peach-30),
    0 18px 50px -10px var(--accent-55),
    0 6px 22px -6px var(--peach-55),
    inset 0 1px 0 var(--sheen-strong),
    inset 0 -3px 8px var(--accent-dark-40);
}
.btn-primary::before{
  content:"";position:absolute;top:-25%;bottom:-25%;left:0;width:45%;
  background:linear-gradient(105deg,transparent,var(--sheen-strong),transparent);
  transform:translateX(-170%) skewX(-18deg);
  animation:sheen 3.6s cubic-bezier(.4,0,.2,1) 1.8s infinite;
  pointer-events:none;
}
@keyframes sheen{
  0%{transform:translateX(-170%) skewX(-18deg)}
  42%,100%{transform:translateX(360%) skewX(-18deg)}
}
.btn-primary svg{width:18px;height:18px}
.btn-primary:hover{
  transform:translateY(-2px);
  box-shadow:
    0 0 0 1px var(--peach-55),
    0 24px 62px -12px var(--accent-55),
    0 8px 28px -6px var(--peach-55),
    inset 0 1px 0 var(--sheen-strong),
    inset 0 -3px 8px var(--accent-dark-40);
}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  padding:17px 32px;font-weight:600;font-size:14px;
  color:var(--text);
  border:1px solid var(--border);background:transparent;
}
.btn-ghost svg{width:15px;height:15px}
.btn-ghost:hover{transform:translateY(-2px);border-color:var(--accent-35);background:var(--accent-08)}
.btn-sm{padding:13px 26px;font-size:13.5px;font-weight:700;letter-spacing:.02em}
.btn-sm svg{width:14px;height:14px}
.btn-ghost.btn-sm{padding:12px 22px}
.btn[disabled],.btn.disabled{opacity:.45;pointer-events:none}
/* 主按钮呼吸光晕包装 */
.cta-main{position:relative;z-index:0;display:inline-flex}
.cta-main::before{
  content:"";position:absolute;inset:4px 6px;border-radius:999px;z-index:-1;
  background:linear-gradient(100deg,var(--accent),var(--accent-2));
  filter:blur(18px);opacity:.55;pointer-events:none;
  animation:haloPulse 2.8s ease-in-out infinite;
}
@keyframes haloPulse{
  0%,100%{opacity:.42;transform:scale(.97)}
  50%{opacity:.8;transform:scale(1.05)}
}

/* ============ 顶部导航(underline-tabs) ============ */
.site-header,#site-header{
  position:sticky;top:0;z-index:60;height:var(--header-h);
  border-bottom:1px solid var(--border-soft);
  background:var(--bg-80);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.header-inner{max-width:var(--wrap);height:100%;margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;gap:28px}
.brand{display:flex;align-items:center;gap:12px;flex:none}
.brand-logo{
  width:34px;height:34px;border-radius:50%;flex:none;display:block;
  box-shadow:0 0 18px -4px var(--accent-55);
}
.brand-text{display:flex;flex-direction:column;gap:3px}
.brand-text strong{font:800 15.5px/1 var(--font-display);color:var(--text);letter-spacing:.01em}
.brand-text em{font:500 9px/1 var(--font-mono);font-style:normal;letter-spacing:.24em;color:var(--text-muted)}
.nav{display:flex;align-self:stretch;gap:2px;margin-left:auto}
.nav a{
  position:relative;display:flex;align-items:center;padding:0 14px;
  font:500 14px/1 var(--font-display);color:var(--text-muted);
  transition:color .2s;
}
.nav a::after{
  content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  box-shadow:0 0 10px var(--accent-55);
  transform:scaleX(0);transform-origin:center;
  transition:transform .25s var(--ease-out);
}
.nav a:hover{color:var(--text)}
.nav a:hover::after{transform:scaleX(.55)}
.nav a.active{color:var(--text)}
.nav a.active::after{transform:scaleX(1)}
/* 工具区:语言切换 + 汉堡(窄屏必须仍贴最右,见响应式段) */
.header-tools{display:flex;align-items:center;gap:12px;flex:none}
/* ---- 语言切换下拉 ---- */
.lang-wrap{position:relative}
.lang{
  display:inline-flex;align-items:center;gap:8px;flex:none;
  padding:8px 14px;border-radius:var(--r-pill);border:1px solid var(--border);
  background:transparent;color:var(--text-muted);
  font:500 13px/1 var(--font-display);cursor:pointer;
  transition:color .2s,border-color .2s;
}
.lang:hover{color:var(--text);border-color:var(--accent-35)}
.lang svg{width:15px;height:15px;flex:none}
.lang .chev{width:12px;height:12px;transition:transform .2s}
.lang-wrap.open .chev{transform:rotate(180deg)}
.lang-menu{
  position:absolute;top:calc(100% + 10px);right:0;min-width:172px;padding:6px;
  border:1px solid var(--border);border-radius:var(--r-m);
  background:var(--bg-panel);
  box-shadow:0 26px 54px -18px var(--shadow-deep);
  opacity:0;visibility:hidden;transform:translateY(-6px);
  transition:opacity .2s,transform .2s var(--ease-out),visibility .2s;
}
.lang-wrap.open .lang-menu{opacity:1;visibility:visible;transform:none}
.lang-menu a{
  display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;
  font:500 13.5px/1.2 var(--font-display);color:var(--text-muted);
}
.lang-menu a:hover{background:var(--accent-08);color:var(--text)}
.lang-menu a.current{color:var(--accent-2);background:var(--accent-08)}
.lang-menu a.current::after{
  content:"";width:6px;height:6px;margin-left:auto;border-radius:50%;flex:none;
  background:var(--accent-2);box-shadow:0 0 8px var(--peach-55);
}
/* ---- 汉堡按钮(桌面隐藏) ---- */
.nav-toggle{
  display:none;width:44px;height:44px;min-width:44px;min-height:44px;flex:none;
  align-items:center;justify-content:center;
  border:1px solid var(--border);border-radius:12px;
  background:transparent;color:var(--text);cursor:pointer;
  transition:border-color .2s,background-color .2s;
}
.nav-toggle:hover{border-color:var(--accent-35);background:var(--accent-08)}
.nav-toggle .bars{position:relative;width:18px;height:12px}
.nav-toggle .bars i{
  position:absolute;left:0;right:0;height:2px;border-radius:2px;background:currentColor;
  transition:top .25s var(--ease-out),transform .25s var(--ease-out);
}
.nav-toggle .bars i:first-child{top:0}
.nav-toggle .bars i:last-child{top:10px}
html.nav-open .nav-toggle .bars i:first-child{top:5px;transform:rotate(45deg)}
html.nav-open .nav-toggle .bars i:last-child{top:5px;transform:rotate(-45deg)}
/* ---- 移动端抽屉(nav 元素,实色背景,整行可点;桌面隐藏) ---- */
.nav-drawer{display:none}
.drawer-list{list-style:none;margin:0;padding:10px 0}
.drawer-list li{margin:0}
.drawer-list a{
  display:flex;align-items:center;width:100%;min-height:48px;
  padding:12px var(--gutter);border-left:3px solid transparent;
  font:600 15px/1.3 var(--font-display);color:var(--text);
  transition:background-color .2s,color .2s,border-color .2s;
}
.drawer-list a:hover{background:var(--accent-08)}
.drawer-list a.active{color:var(--accent-2);border-left-color:var(--accent);background:var(--accent-08)}
.drawer-langs{border-top:1px solid var(--border-soft);padding:8px 0 14px}
.drawer-cap{margin:8px var(--gutter) 4px;font:500 10px/1 var(--font-mono);letter-spacing:.26em;color:var(--text-muted)}
.drawer-langs a{
  display:flex;align-items:center;gap:10px;width:100%;min-height:44px;
  padding:10px var(--gutter);
  font:500 14px/1.3 var(--font-display);color:var(--text-muted);
  transition:color .2s,background-color .2s;
}
.drawer-langs a:hover{color:var(--text);background:var(--accent-08)}
.drawer-langs a.current{color:var(--accent-2)}
.drawer-langs a.current::after{
  content:"";width:6px;height:6px;border-radius:50%;flex:none;
  background:var(--accent-2);box-shadow:0 0 8px var(--peach-55);
}
/* 遮罩:层级(50)低于 sticky 头部(60),抽屉在头部层叠上下文内部,链接始终可点 */
.nav-veil{
  position:fixed;inset:0;z-index:50;background:var(--veil);
  opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s;
}
html.nav-open .nav-veil{opacity:1;visibility:visible}

/* ============ 页脚 ============ */
.site-footer{border-top:1px solid var(--border-soft);background:linear-gradient(180deg,var(--bg),var(--bg-panel))}
.footer-inner{max-width:var(--wrap);margin:0 auto;padding:64px var(--gutter) 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.25fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{margin:16px 0 0;max-width:320px;color:var(--text-muted);font-size:13.5px;line-height:1.85}
.footer-title{margin:0 0 16px;font:600 11px/1 var(--font-mono);letter-spacing:.26em;color:var(--accent-2)}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a{
  display:inline-flex;align-items:center;min-height:30px;padding:4px 0;
  color:var(--text-muted);font-size:13.5px;transition:color .2s;
}
.footer-links a:hover{color:var(--accent-2)}
.hot-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.hot-list li{margin:0}
.hot-list a{
  display:inline-flex;align-items:center;padding:7px 13px;border-radius:var(--r-pill);
  border:1px solid var(--border-soft);color:var(--text-muted);font-size:12.5px;
  transition:color .2s,border-color .2s,transform .2s;
}
.hot-list a:hover{color:var(--text);border-color:var(--accent-35);transform:translateY(-1px)}
.footer-bottom{
  max-width:var(--wrap);margin:52px auto 0;padding:20px var(--gutter) 28px;
  border-top:1px solid var(--border-soft);
  display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;
}
.footer-copy{margin:0;font:500 12px/1.6 var(--font-mono);letter-spacing:.08em;color:var(--text-muted)}
.footer-note{margin:0;font:500 11px/1.6 var(--font-mono);letter-spacing:.14em;color:var(--text-muted)}

/* ============ Hero 首屏(拍板稿:地平线光轨跑道 + 动态大字入场) ============ */
.hero{position:relative;height:836px;overflow:hidden;background:var(--bg)}
/* ---- 场景层 ---- */
.scene{position:absolute;inset:0;z-index:0;animation:sceneIn .9s ease-out backwards}
.scene::before{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(180deg,var(--shade-top),transparent 26%),
    radial-gradient(460px 180px at 50% 62%,var(--peach-30),transparent 70%),
    radial-gradient(960px 430px at 50% 63%,var(--accent-12),transparent 72%),
    radial-gradient(1200px 500px at 50% 108%,var(--accent-10),transparent 60%);
  animation:glowPulse 8s ease-in-out infinite;
}
.scene::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 95% at 50% 45%,transparent 56%,var(--vignette) 100%);
}
.road{position:absolute;inset:0;width:100%;height:100%;display:block}
.gs-peach{stop-color:var(--accent-2)}
.gs-pink{stop-color:var(--accent)}
.grid-v line{stroke:var(--grid-v);stroke-width:1;opacity:.5}
.grid-h line{stroke:var(--grid-h);stroke-width:1}
.grid-h line:nth-child(1){opacity:.05}
.grid-h line:nth-child(2){opacity:.06}
.grid-h line:nth-child(3){opacity:.07}
.grid-h line:nth-child(4){opacity:.08}
.grid-h line:nth-child(5){opacity:.10}
.grid-h line:nth-child(6){opacity:.12}
.grid-h line:nth-child(7){opacity:.14}
.grid-h line:nth-child(8){opacity:.16}
.grid-h line:nth-child(9){opacity:.18}
.grid-h line:nth-child(10){opacity:.20}
.grid-h line:nth-child(11){opacity:.22}
.vp{fill:var(--accent-2);opacity:.5;filter:url(#blur5)}
.vp2{fill:var(--accent);opacity:.22;filter:url(#blur5)}
.tg{fill:none;stroke-width:10;opacity:.4;filter:url(#blur5)}
.tc{fill:none;stroke-width:2.4;opacity:.95}
.th{fill:none;stroke:var(--peach-bright);stroke-width:1;opacity:.7}
.tl{stroke:url(#trailL)}
.tr{stroke:url(#trailR)}
.lights circle{opacity:.9}
.lt-a{fill:var(--accent-2);filter:drop-shadow(0 0 4px var(--peach-55))}
.lt-b{fill:var(--accent);filter:drop-shadow(0 0 5px var(--accent-55))}
.pulse{fill:var(--peach-bright);opacity:0;filter:drop-shadow(0 0 6px var(--peach-85))}
.p1{animation:pulseL 5.4s linear 1.4s infinite}
.p2{animation:pulseR 5.4s linear 4s infinite}
.horizon{
  position:absolute;left:6%;right:6%;top:62.2%;height:1px;
  background:linear-gradient(90deg,transparent,var(--peach-30) 18%,var(--peach-85) 50%,var(--peach-30) 82%,transparent);
  box-shadow:0 0 14px var(--peach-55),0 0 44px var(--accent-28);
}
@keyframes sceneIn{from{opacity:0}to{opacity:1}}
@keyframes glowPulse{0%,100%{opacity:.82}50%{opacity:1}}
@keyframes pulseL{
  0%{opacity:0;transform:translate(0,0) scale(1)}
  10%{opacity:.9}
  75%{opacity:.5}
  100%{opacity:0;transform:translate(328px,-316px) scale(.35)}
}
@keyframes pulseR{
  0%{opacity:0;transform:translate(0,0) scale(1)}
  10%{opacity:.9}
  75%{opacity:.5}
  100%{opacity:0;transform:translate(-328px,-316px) scale(.35)}
}
/* ---- 内容层 ---- */
.hero-inner{
  position:relative;z-index:2;height:100%;
  display:flex;flex-direction:column;align-items:center;
  padding-top:60px;padding-inline:var(--gutter);
}
.kicker{
  display:flex;align-items:center;gap:16px;margin:0;
  font:500 11px/1 var(--font-mono);letter-spacing:.34em;padding-left:.34em;
  color:var(--text-muted);
  animation:fadeUp .45s var(--ease-out) 0s backwards;
}
.kicker::before,.kicker::after{content:"";width:44px;height:1px;flex:none}
.kicker::before{background:linear-gradient(90deg,transparent,var(--accent-55))}
.kicker::after{background:linear-gradient(90deg,var(--accent-55),transparent)}
.h1{
  margin:18px 0 0;padding:0 24px;text-align:center;white-space:nowrap;
  font:900 clamp(58px,6.4vw,96px)/1.06 var(--font-display);
  letter-spacing:.02em;color:var(--text);
  transform:skewX(-3deg);
  filter:drop-shadow(0 10px 34px var(--accent-18));
}
.h1 .w1{display:inline-block;animation:riseIn .6s var(--ease-out) .06s backwards}
.h1 .w2{display:inline-block;margin-left:.12em;filter:drop-shadow(0 4px 18px var(--accent-35))}
.h1 .ch{
  display:inline-block;
  background:linear-gradient(100deg,var(--accent) 10%,var(--accent-2) 90%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  animation:riseIn .55s var(--ease-out) backwards;
}
.h1 .ch:nth-child(1){animation-delay:.16s}
.h1 .ch:nth-child(2){animation-delay:.24s}
.h1 .ch:nth-child(3){animation-delay:.32s}
.h1 .ch:nth-child(4){animation-delay:.40s}
@supports not ((-webkit-background-clip:text) or (background-clip:text)){
  .h1 .ch{color:var(--accent-2);-webkit-text-fill-color:currentColor}
}
@keyframes riseIn{
  from{opacity:0;transform:translateY(.55em)}
  to{opacity:1;transform:translateY(0)}
}
.h1-bar{
  display:block;width:110px;height:6px;border-radius:3px;margin:18px auto 0;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));
  box-shadow:0 0 16px var(--accent-55);
  transform-origin:center;
  animation:barIn .4s var(--ease-out) .48s backwards;
}
@keyframes barIn{
  from{opacity:0;transform:scaleX(0)}
  to{opacity:1;transform:scaleX(1)}
}
.lede{
  margin:18px 0 0;max-width:780px;text-align:center;
  font:400 15.5px/1.8 var(--font-body);color:var(--text-muted);
  animation:fadeUp .45s var(--ease-out) .52s backwards;
}
.lede strong{
  color:var(--text);font-weight:600;padding-bottom:2px;
  background:linear-gradient(90deg,var(--accent-35),var(--peach-30)) no-repeat left bottom;
  background-size:100% 1px;
}
@keyframes fadeUp{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:translateY(0)}
}
.row-cta{display:flex;align-items:center;gap:18px;margin-top:30px;animation:fadeUp .45s var(--ease-out) .6s backwards}
/* ---- 平台通行灯 chips ---- */
.plats{display:flex;gap:12px;margin-top:30px;animation:fadeUp .45s var(--ease-out) .68s backwards}
.plat{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:var(--r-pill);
  border:1px solid var(--border);background:var(--panel-55);
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  color:var(--text-muted);font:500 13px/1 var(--font-display);
  transition:transform .2s,color .2s,border-color .2s,box-shadow .25s;
}
.plat:hover{
  color:var(--text);border-color:var(--accent-35);transform:translateY(-2px);
  box-shadow:0 6px 20px -8px var(--accent-35);
}
.plat .dot{width:6px;height:6px;border-radius:50%;flex:none;background:var(--success);box-shadow:0 0 8px var(--success-glow)}
.plat svg{width:15px;height:15px;flex:none}
/* ---- 事实胶囊行(里程标小字注记) ---- */
.facts{display:flex;gap:10px;margin-top:18px;animation:fadeUp .4s var(--ease-out) .74s backwards}
.fact{
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 15px;border-radius:var(--r-pill);
  border:1px solid var(--border-soft);
  font:500 11px/1 var(--font-mono);letter-spacing:.14em;
  color:var(--text-muted);
}
.fact i{width:4px;height:4px;flex:none;transform:rotate(45deg);background:var(--accent-2);box-shadow:0 0 6px var(--peach-55)}

/* ============ 滚动淡入(reveal.js 驱动) ============ */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .7s var(--ease-out),transform .7s var(--ease-out)}
.reveal.shown{opacity:1;transform:none}

/* ============ 工具类 ============ */
[hidden]{display:none !important}
.mono{font-family:var(--font-mono)}
.muted{color:var(--text-muted)}
.text-center{text-align:center}
.visually-hidden{
  position:absolute !important;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
/* 微倾斜装饰:只许用于小卡片,严禁用在长内容容器;窄屏一律回正 */
.tilt-r{transform:rotate(.6deg)}
.tilt-l{transform:rotate(-.6deg)}

/* ============ 响应式 ============ */
@media (max-width:1180px){
  .nav a{padding:0 9px;font-size:13px}
  .brand-text em{display:none}
  .header-inner{gap:18px}
}
@media (max-width:960px){
  .nav{display:none}
  .header-tools{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .nav-drawer{
    display:block;position:absolute;top:var(--header-h);left:0;right:0;z-index:3;
    background:var(--bg-panel);
    border-bottom:1px solid var(--border);
    box-shadow:0 34px 60px -24px var(--shadow-deep);
    max-height:calc(100vh - var(--header-h));
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;overscroll-behavior:contain;
    transform:translateY(-10px);opacity:0;visibility:hidden;
    transition:transform .25s var(--ease-out),opacity .25s,visibility .25s;
  }
  html.nav-open .nav-drawer{transform:none;opacity:1;visibility:visible}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .hero{height:auto;min-height:600px;padding-bottom:72px}
  .hero-inner{padding-top:56px}
}
@media (max-width:640px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .sec{padding-top:64px;padding-bottom:64px}
  .sec-sm{padding-top:44px;padding-bottom:44px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .h1{font-size:clamp(38px,11.5vw,58px)}
  .kicker{letter-spacing:.18em;gap:10px;font-size:10px}
  .kicker::before,.kicker::after{width:22px}
  .lede{font-size:14.5px;padding-inline:8px}
  /* 窄屏头部:品牌名可收缩,语言按钮只留图标(抽屉内有完整语言列表),避免整行溢出 */
  .header-inner{gap:12px}
  .brand,.brand-text{min-width:0}
  .brand-text strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .lang{padding:8px 10px}
  .lang>span{display:none}
  .row-cta{flex-wrap:wrap;justify-content:center;gap:14px}
  .btn-primary{padding:18px 38px;font-size:15.5px}
  .btn-ghost{padding:15px 26px}
  .plats{flex-wrap:wrap;justify-content:center;gap:9px}
  .facts{flex-wrap:wrap;justify-content:center}
  .tilt-r,.tilt-l{transform:none}
}
@media (max-width:400px){
  .btn-primary{padding:17px 30px;font-size:15px}
  .brand-text strong{font-size:14px}
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}