/* ==========================================================================
   乐竞赛事 · 共享站点样式 /assets/site.css
   ========================================================================== */

*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:128px;
  overflow-x:clip;
}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol,pre{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}
::selection{background:rgba(51,224,210,.3);color:#F2EFE6;}

/* ---------- 变量 ---------- */
:root{
  --ink:#0B0F12;
  --blue-deep:#101A24;
  --blue-mid:#1B2A38;
  --cyan:#33E0D2;
  --cyan-dim:#1C8F8B;
  --orange:#FF6A2A;
  --yellow:#E7FF5C;
  --stone:#6F7B82;
  --moss:#5D7A63;
  --clay:#B26E57;
  --bone:#F2EFE6;

  --text:#E9EDEF;
  --text-soft:#B3BEC5;
  --text-mute:#7F8C94;

  --line:rgba(111,123,130,.26);
  --line-mid:rgba(111,123,130,.44);
  --line-cyan:rgba(51,224,210,.44);

  --shell:1240px;
  --gutter:clamp(16px,4.2vw,56px);
  --radius:3px;

  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Noto Sans Mono",monospace;
}

/* ---------- 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.012em;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    radial-gradient(120% 56% at 82% -6%,rgba(51,224,210,.075),transparent 62%),
    radial-gradient(90% 44% at 4% 100%,rgba(255,106,42,.05),transparent 70%),
    linear-gradient(180deg,#0B0F12 0%,#101A24 46%,#0B0F12 100%);
  background-attachment:fixed;
  min-height:100vh;
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.16;
  letter-spacing:.02em;
  color:var(--bone);
  text-wrap:balance;
}
h1{font-size:clamp(30px,4.6vw,54px);}
h2{font-size:clamp(25px,3.4vw,40px);}
h3{font-size:clamp(19px,2.2vw,26px);}
h4{font-size:clamp(16px,1.6vw,19px);}
p{line-height:1.8;}
strong,b{color:var(--bone);font-weight:700;}
small{font-size:12px;color:var(--text-mute);}
::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:var(--ink);}
::-webkit-scrollbar-thumb{background:var(--blue-mid);border:2px solid var(--ink);border-radius:8px;}
::-webkit-scrollbar-thumb:hover{background:var(--cyan-dim);}

/* ---------- 布局工具 ---------- */
.lj-shell{width:min(var(--shell),calc(100% - var(--gutter) * 2));margin-inline:auto;}
.lj-main{display:block;}
.lj-section{padding-block:clamp(46px,7vw,96px);}
.lj-section--band{
  background:linear-gradient(180deg,rgba(27,42,56,.62),rgba(16,26,36,.18));
  border-block:1px solid var(--line);
}
.lj-prose{max-width:68ch;font-size:16px;line-height:1.85;color:var(--text-soft);}
.lj-prose p + p{margin-top:1em;}
.lj-prose a{color:var(--cyan);border-bottom:1px solid rgba(51,224,210,.34);}
.lj-prose a:hover{color:var(--bone);border-bottom-color:var(--cyan);}
.lj-cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 42px),calc(100% - 42px) 100%,0 100%);}

/* ---------- 栅格 ---------- */
.lj-grid{display:grid;gap:clamp(16px,2.2vw,28px);}
.lj-grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.lj-grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.lj-grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
.lj-grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}
.lj-grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr);}
.lj-grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr);}

/* ---------- 按钮与链接 ---------- */
.lj-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:11px 20px;
  font-family:var(--font-body);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.2;
  color:var(--bone);
  background:transparent;
  border:1px solid var(--line-mid);
  border-radius:var(--radius);
  white-space:nowrap;
  transition:color .18s ease,border-color .18s ease,background .18s ease,transform .18s ease;
}
.lj-btn:hover{color:var(--cyan);border-color:var(--cyan);transform:translateY(-1px);}
.lj-btn--primary{background:var(--cyan);border-color:var(--cyan);color:#04110F;font-weight:700;}
.lj-btn--primary:hover{background:var(--yellow);border-color:var(--yellow);color:#0B0F12;}
.lj-btn--orange{background:var(--orange);border-color:var(--orange);color:#170702;}
.lj-btn--orange:hover{background:#FF8047;border-color:#FF8047;color:#170702;}
.lj-btn--ghost{color:var(--text-soft);border-color:var(--line);background:rgba(111,123,130,.06);}
.lj-btn--ghost:hover{color:var(--cyan);border-color:var(--cyan);background:rgba(51,224,210,.08);}
.lj-btn--sm{padding:8px 14px;font-size:12.5px;letter-spacing:.06em;}
.lj-btn--block{width:100%;}

.lj-link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--cyan);
  border-bottom:1px solid rgba(51,224,210,.34);
  transition:color .18s ease,border-color .18s ease;
}
.lj-link:hover{color:var(--bone);border-bottom-color:var(--cyan);}

.lj-rule{
  position:relative;
  height:1px;
  border:0;
  background:var(--line);
  margin-block:clamp(22px,3vw,40px);
}
.lj-rule::before{
  content:"";
  position:absolute;
  left:0;
  top:-2px;
  width:64px;
  height:5px;
  opacity:.6;
  background:repeating-linear-gradient(90deg,var(--stone) 0 1px,transparent 1px 8px);
}

/* ---------- 章节标题 ---------- */
.lj-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--cyan);
}
.lj-eyebrow::before{content:"";width:18px;height:1px;background:var(--cyan);flex:none;}
.lj-sechead{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:start;
  gap:clamp(16px,3vw,36px);
  margin-bottom:clamp(24px,3.6vw,44px);
  padding-bottom:clamp(14px,2vw,22px);
  border-bottom:1px solid var(--line);
}
.lj-sechead__num{
  font-family:var(--font-mono);
  font-size:clamp(38px,7vw,84px);
  font-weight:700;
  line-height:.82;
  letter-spacing:-.05em;
  color:var(--cyan-dim);
  user-select:none;
}
@supports (-webkit-text-stroke:1px #000){
  .lj-sechead__num{color:transparent;-webkit-text-stroke:1px var(--cyan-dim);}
}
.lj-sechead__body{display:flex;flex-direction:column;gap:10px;padding-top:4px;}

/* ---------- 面包屑 ---------- */
.lj-crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.05em;
  color:var(--text-mute);
}
.lj-crumbs a{color:var(--text-soft);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease;}
.lj-crumbs a:hover{color:var(--cyan);border-bottom-color:var(--cyan);}
.lj-crumbs__sep{color:var(--stone);}
.lj-crumbs [aria-current="page"]{color:var(--bone);}

/* ---------- 卡片 / 面板 ---------- */
.lj-panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:linear-gradient(180deg,rgba(27,42,56,.66),rgba(16,26,36,.88));
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.lj-panel:hover{
  border-color:var(--line-cyan);
  transform:translateY(-2px);
  box-shadow:0 18px 42px -34px rgba(51,224,210,.9);
}

/* ---------- 标签 ---------- */
.lj-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.1em;
  line-height:1.5;
  color:var(--cyan);
  background:rgba(51,224,210,.1);
  border:1px solid rgba(51,224,210,.34);
  border-radius:2px;
}
.lj-tag--orange{color:var(--orange);background:rgba(255,106,42,.1);border-color:rgba(255,106,42,.38);}
.lj-tag--yellow{color:var(--yellow);background:rgba(231,255,92,.1);border-color:rgba(231,255,92,.34);}
.lj-tag--moss{color:#93BC9E;background:rgba(93,122,99,.18);border-color:rgba(93,122,99,.52);}
.lj-tag--clay{color:#D79B86;background:rgba(178,110,87,.18);border-color:rgba(178,110,87,.52);}
.lj-tag--stone{color:var(--text-soft);background:rgba(111,123,130,.14);border-color:var(--line-mid);}

/* ---------- 图片容器 ---------- */
.lj-media{
  position:relative;
  display:block;
  width:100%;
  margin:0;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(140deg,#14212C 0%,#0B0F12 100%);
}
.lj-media img{width:100%;height:100%;object-fit:cover;filter:saturate(.86) contrast(1.05);}
.lj-media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(11,15,18,0) 44%,rgba(11,15,18,.74) 100%);
}
.lj-media--wide{aspect-ratio:16/9;}
.lj-media--tall{aspect-ratio:4/5;}
.lj-media--square{aspect-ratio:1/1;}
.lj-media--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 28px),calc(100% - 28px) 100%,0 100%);}
.lj-media__cap{
  position:absolute;
  left:14px;
  right:14px;
  bottom:11px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--text-soft);
}

/* ---------- 数据刻度条 ---------- */
.lj-stats{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(16,26,36,.62);
}
.lj-stats__item{padding:18px 20px;border-right:1px solid var(--line);}
.lj-stats__item:last-child{border-right:0;}
.lj-stats__num{
  font-family:var(--font-mono);
  font-size:clamp(22px,3vw,32px);
  font-weight:700;
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.lj-stats__label{margin-top:4px;font-size:12px;letter-spacing:.06em;color:var(--text-mute);}

/* ---------- 折叠面板 ---------- */
.lj-fold{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(27,42,56,.42);
  transition:border-color .18s ease;
}
.lj-fold + .lj-fold{margin-top:10px;}
.lj-fold:hover{border-color:var(--line-mid);}
.lj-fold__btn{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 18px;
  text-align:left;
  font-size:15px;
  font-weight:600;
  color:var(--bone);
  transition:color .18s ease;
}
.lj-fold__btn:hover{color:var(--cyan);}
.lj-fold__icon{position:relative;flex:none;width:14px;height:14px;}
.lj-fold__icon::before,
.lj-fold__icon::after{content:"";position:absolute;background:var(--cyan);transition:transform .18s ease,opacity .18s ease;}
.lj-fold__icon::before{left:0;top:6px;width:14px;height:2px;}
.lj-fold__icon::after{left:6px;top:0;width:2px;height:14px;}
.lj-fold__btn[aria-expanded="true"] .lj-fold__icon::after{transform:rotate(90deg);opacity:0;}
.lj-fold__body{
  display:grid;
  grid-template-rows:0fr;
  overflow:hidden;
  transition:grid-template-rows .18s ease;
}
.lj-fold__body[data-open]{grid-template-rows:1fr;}
.lj-fold__inner{
  min-height:0;
  overflow:hidden;
  padding-inline:18px;
  border-top:1px solid transparent;
  font-size:14.5px;
  line-height:1.8;
  color:var(--text-soft);
  transition:padding .18s ease,border-color .18s ease;
}
.lj-fold__body[data-open] .lj-fold__inner{padding-block:14px 18px;border-top-color:var(--line);}

/* ---------- 复制按钮 ---------- */
.lj-copy{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--text-mute);
  border:1px solid var(--line);
  border-radius:2px;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.lj-copy:hover{color:var(--cyan);border-color:var(--line-cyan);background:rgba(51,224,210,.08);}
.lj-copy[data-copied="true"]{color:var(--yellow);border-color:rgba(231,255,92,.46);background:rgba(231,255,92,.08);}

/* ---------- 滚动进度 ---------- */
.lj-progress{
  position:fixed;
  inset:0 0 auto 0;
  height:2px;
  z-index:95;
  background:rgba(111,123,130,.16);
  pointer-events:none;
}
.lj-progress__bar{
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--cyan) 58%,var(--yellow) 82%,var(--orange) 100%);
}

/* ---------- 头部 ---------- */
.skip-link{
  position:absolute;
  left:12px;
  top:-120px;
  z-index:200;
  padding:10px 18px;
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  color:#04110F;
  background:var(--cyan);
  border-radius:2px;
  transition:top .18s ease;
}
.skip-link:focus{top:10px;}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(11,15,18,.86);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  backdrop-filter:blur(16px) saturate(130%);
  transition:background .2s ease,box-shadow .2s ease;
}
.site-header.is-scrolled{
  background:rgba(11,15,18,.95);
  box-shadow:0 14px 34px -30px #000;
}

/* 上层：品牌说明 */
.masthead{
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(27,42,56,.52) 0%,rgba(16,26,36,.2) 58%,rgba(11,15,18,0) 100%);
}
.masthead__inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2vw,30px);
  min-height:58px;
}
.brand{display:inline-flex;align-items:center;gap:12px;}
.brand__glyph{
  display:grid;
  place-items:center;
  flex:none;
  width:34px;
  height:34px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:-.06em;
  color:#04110F;
  background:linear-gradient(150deg,var(--cyan) 0%,#1FC4B8 100%);
  clip-path:polygon(0 0,100% 0,100% 74%,74% 100%,0 100%);
  transition:background .2s ease,transform .2s ease;
}
.brand:hover .brand__glyph{background:linear-gradient(150deg,var(--yellow) 0%,var(--cyan) 100%);transform:translateY(-1px);}
.brand__text{display:flex;flex-direction:column;gap:1px;line-height:1.15;}
.brand__name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:800;
  letter-spacing:.16em;
  color:var(--bone);
}
.brand__tagline{font-size:10.5px;letter-spacing:.22em;color:var(--text-mute);}
.masthead__note{
  display:flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--text-mute);
  white-space:nowrap;
}
.masthead__note::before{
  content:"";
  flex:none;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(51,224,210,.16);
  animation:lj-pulse 3.4s ease-in-out infinite;
}
.masthead__tools{margin-left:auto;display:flex;align-items:center;gap:12px;}

/* 下层：栏目带 */
.navdeck{
  border-bottom:1px solid var(--line);
  background:rgba(16,26,36,.36);
}
.navdeck__inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
  min-height:54px;
}
.nav{display:flex;align-items:center;min-width:0;}
.nav__list{display:flex;align-items:center;gap:2px;}
.nav__item{display:flex;}
.nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:15px clamp(9px,1.3vw,16px);
  font-size:14px;
  font-weight:500;
  letter-spacing:.04em;
  color:var(--text-soft);
  border-bottom:2px solid transparent;
  white-space:nowrap;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.nav__link:hover{color:var(--bone);background:rgba(51,224,210,.07);}
.nav__link[aria-current="page"]{color:var(--bone);border-bottom-color:var(--cyan);background:rgba(51,224,210,.06);}
.nav__tick{
  flex:none;
  width:4px;
  height:4px;
  background:var(--stone);
  transition:background .18s ease,box-shadow .18s ease;
}
.nav__link:hover .nav__tick{background:var(--cyan);}
.nav__link[aria-current="page"] .nav__tick{background:var(--cyan);box-shadow:0 0 8px rgba(51,224,210,.85);}
.navdeck__cta{margin-left:auto;flex:none;}

/* 移动导航按钮 */
.navtoggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:13px 4px 13px 0;
  font-size:13px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--text-soft);
  transition:color .18s ease;
}
.navtoggle__bars{display:flex;flex-direction:column;gap:4px;width:20px;flex:none;}
.navtoggle__bars span{display:block;height:2px;background:currentColor;transition:transform .18s ease,opacity .18s ease;}
.navtoggle:hover{color:var(--cyan);}
.site-header[data-open] .navtoggle{color:var(--cyan);}
.site-header[data-open] .navtoggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.site-header[data-open] .navtoggle__bars span:nth-child(2){opacity:0;}
.site-header[data-open] .navtoggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

@keyframes lj-pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(51,224,210,.16);opacity:1;}
  50%{box-shadow:0 0 0 5px rgba(51,224,210,.05);opacity:.72;}
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:clamp(60px,9vw,120px);
  color:var(--text-soft);
  background:linear-gradient(180deg,#0B0F12 0%,#101A24 56%,#0B0F12 100%);
}
.site-footer::before{
  content:"";
  display:block;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0%,rgba(51,224,210,.16) 36%,transparent 64%,rgba(255,106,42,.6) 100%);
}
.footer__main{
  display:grid;
  grid-template-columns:minmax(0,4.2fr) minmax(0,7.8fr);
  gap:clamp(28px,4vw,58px);
  padding-block:clamp(38px,5vw,64px) clamp(26px,3.5vw,40px);
}
.footer__lede{display:flex;flex-direction:column;align-items:flex-start;gap:14px;}
.footer__summary{max-width:36ch;font-size:14px;line-height:1.85;color:var(--text-soft);}
.footer__summary--dim{font-size:12.5px;color:var(--text-mute);letter-spacing:.04em;}
.footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,36px);
}
.footer__col{min-width:0;}
.footer__title{
  margin-bottom:14px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--stone);
  border-bottom:1px solid var(--line);
}
.footer__list{display:flex;flex-direction:column;gap:9px;font-size:13.5px;}
.footer__link{
  position:relative;
  display:inline-block;
  color:var(--text-soft);
  transition:color .18s ease;
}
.footer__link::after{
  content:"";
  position:absolute;
  left:0;
  bottom:-2px;
  width:0;
  height:1px;
  background:var(--cyan);
  transition:width .2s ease;
}
.footer__link:hover{color:var(--cyan);}
.footer__link:hover::after{width:100%;}

.footer__contact{
  display:grid;
  gap:2px;
  padding-top:clamp(22px,3vw,32px);
  padding-bottom:clamp(26px,3.5vw,40px);
  border-top:1px solid var(--line);
}
.footer__contact-row{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 14px;
  padding:9px 0;
  font-size:13.5px;
  line-height:1.7;
}
.footer__k{
  flex:none;
  width:74px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--stone);
}
.footer__v{color:var(--text-soft);min-width:0;}
a.footer__v{transition:color .18s ease;}
a.footer__v:hover{color:var(--cyan);}
.footer__note{max-width:74ch;margin-top:10px;font-size:12px;line-height:1.7;color:var(--text-mute);}

.site-footer__base{border-top:1px solid var(--line);background:rgba(11,15,18,.72);}
.footer__base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:16px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--text-mute);
}
.footer__copyright,.footer__icp{font-size:11.5px;}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .masthead__note{font-size:11px;letter-spacing:.02em;}
  .nav__link{padding-inline:9px;font-size:13.5px;}
}

@media (max-width:980px){
  .lj-grid--3,.lj-grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .lj-grid--7-5,.lj-grid--8-4,.lj-grid--5-7{grid-template-columns:minmax(0,1fr);}
  .footer__main{grid-template-columns:minmax(0,1fr);}
}

/* ---------- 移动导航 ---------- */
@media (max-width:900px){
  html{scroll-padding-top:112px;}
  .masthead__inner{min-height:54px;}
  .masthead__note{display:none;}
  .masthead__tools{display:none;}
  .navdeck__inner{
    flex-wrap:wrap;
    column-gap:12px;
    row-gap:0;
    min-height:52px;
  }
  .navtoggle{display:inline-flex;order:1;}
  .navdeck__cta{order:2;margin-left:auto;padding:8px 12px;font-size:12px;letter-spacing:.04em;}
  .nav{
    order:3;
    flex-basis:100%;
    width:100%;
    display:none;
    flex-direction:column;
    border-top:1px solid var(--line);
    padding-bottom:8px;
  }
  .site-header[data-open] .nav{display:flex;}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%;}
  .nav__item{display:block;}
  .nav__link{
    width:100%;
    padding:13px 2px;
    justify-content:flex-start;
    border-bottom:1px solid var(--line);
    border-left:2px solid transparent;
    font-size:14px;
  }
  .nav__link:hover{background:rgba(51,224,210,.05);}
  .nav__link[aria-current="page"]{
    border-bottom-color:var(--line);
    border-left-color:var(--cyan);
    padding-left:12px;
    color:var(--cyan);
  }
  .footer__cols{grid-template-columns:repeat(3,minmax(0,1fr));}
}

@media (max-width:720px){
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr));}
  .lj-sechead{grid-template-columns:minmax(0,1fr);gap:8px;}
  .lj-sechead__num{font-size:clamp(34px,11vw,56px);}
  .footer__k{width:100%;}
  .footer__contact-row{gap:4px 12px;}
}

@media (max-width:640px){
  .lj-grid--2,.lj-grid--3,.lj-grid--4{grid-template-columns:minmax(0,1fr);}
  .lj-stats__item{border-right:0;border-bottom:1px solid var(--line);}
  .lj-stats__item:last-child{border-bottom:0;}
  .brand__tagline{display:none;}
}

@media (max-width:420px){
  .footer__cols{grid-template-columns:minmax(0,1fr);}
  .navdeck__cta{font-size:11.5px;padding:7px 10px;}
}

/* ---------- 降低动态偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .lj-panel:hover,
  .lj-btn:hover,
  .brand:hover .brand__glyph{transform:none;}
  .masthead__note::before{animation:none;}
  .lj-fold__body{transition:none;}
}