/* =========================================================
   江南看台 · 共享样式表 /assets/site.css
   底色：看台夜青 / 深水墨绿 / 湖水蓝，唯一强调色：荧光橘
   ========================================================= */

:root{
  --jt-ink:#0E1F24;
  --jt-moss:#16382F;
  --jt-lake:#2E6E7E;
  --jt-mist:#7FA8AE;
  --jt-fog:#E6EEEF;
  --jt-accent:#FF6B2C;
  --jt-sand:#C4B79C;
  --jt-link:#4C93A8;
  --jt-deep:#081114;
  --jt-line:#3C4C50;
  --jt-line-soft:rgba(60,76,80,.62);
  --jt-line-hair:rgba(127,168,174,.22);

  --jt-header-h:70px;
  --jt-radius:2px;
  --jt-ease:cubic-bezier(.22,.61,.36,1);
  --jt-gutter:clamp(18px,4vw,56px);
  --jt-max:1240px;
  --jt-shadow:0 18px 36px -30px rgba(0,0,0,.95);

  --jt-font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --jt-font-body:var(--jt-font-display);
  --jt-font-mono:"SF Mono",SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono","PingFang SC",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--jt-ink);
  background-image:
    radial-gradient(1100px 560px at 84% -12%, rgba(46,110,126,.20), rgba(46,110,126,0) 70%),
    radial-gradient(900px 520px at 4% 108%, rgba(22,56,47,.55), rgba(22,56,47,0) 72%);
  background-repeat:no-repeat;
  color:var(--jt-fog);
  font-family:var(--jt-font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{max-width:100%;height:auto;display:block}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--jt-accent);outline-offset:3px}
:focus:not(:focus-visible){outline:none}
::selection{background:var(--jt-accent);color:var(--jt-deep)}
[id]{scroll-margin-top:calc(var(--jt-header-h) + 20px)}

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4,h5{font-family:var(--jt-font-display);font-weight:600;line-height:1.25;letter-spacing:-.01em;margin:0 0 .6em;color:var(--jt-fog)}
h1{font-size:clamp(30px,5.2vw,54px);font-weight:700}
h2{font-size:clamp(22px,3vw,34px)}
h3{font-size:clamp(18px,2vw,23px)}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 1em;padding-left:1.15em}
a{color:var(--jt-link);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:rgba(76,147,168,.5);transition:color .25s var(--jt-ease)}
a:hover{color:var(--jt-fog)}
strong{font-weight:600;color:var(--jt-fog)}
em{font-style:normal;color:var(--jt-sand)}
hr{border:0;border-top:1px solid var(--jt-line-hair);margin:clamp(24px,4vw,48px) 0}

.jt-num,.jt-stat__value,.jt-section__num,.jt-footer__legal,.jt-pagehead__meta,.jt-crumbs{font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.jt-num{font-family:var(--jt-font-mono)}
.jt-lead{font-size:clamp(17px,1.6vw,20px);line-height:1.75;color:var(--jt-fog);max-width:34em}
.jt-muted{color:var(--jt-mist)}
.jt-prose{max-width:34em}
.jt-prose p{margin-bottom:1.1em}
.jt-annot{font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.28em;color:var(--jt-mist);margin:0}
.jt-annot--vertical{writing-mode:vertical-rl;text-orientation:mixed;letter-spacing:.34em}
.jt-sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 布局容器 ---------- */
.jt-main{display:block}
.jt-main--inset{padding-top:var(--jt-header-h)}
.jt-container{width:100%;max-width:var(--jt-max);margin-inline:auto;padding-inline:var(--jt-gutter)}
.jt-container--narrow{max-width:820px}
.jt-container--wide{max-width:1440px}

.jt-grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(14px,1.8vw,26px)}
.jt-col-3{grid-column:span 3}
.jt-col-4{grid-column:span 4}
.jt-col-5{grid-column:span 5}
.jt-col-6{grid-column:span 6}
.jt-col-7{grid-column:span 7}
.jt-col-8{grid-column:span 8}
.jt-col-9{grid-column:span 9}
.jt-col-12{grid-column:span 12}

/* ---------- 色带与章节 ---------- */
.jt-band{display:flex;height:3px;width:100%;overflow:hidden;border:0;padding:0;margin:0}
.jt-band__seg{display:block;height:100%;flex:1;background:var(--jt-moss)}
.jt-band__seg--lake{background:var(--jt-lake)}
.jt-band__seg--mist{background:var(--jt-mist)}
.jt-band__seg--accent{background:var(--jt-accent)}
.jt-band__seg--deep{background:var(--jt-deep)}

.jt-section{position:relative;padding:clamp(40px,6vw,86px) 0}
.jt-section__head{display:grid;grid-template-columns:auto minmax(0,1fr);gap:clamp(16px,3vw,36px);align-items:baseline;padding-top:20px;border-top:1px solid var(--jt-line-hair)}
.jt-section__num{font-family:var(--jt-font-mono);font-size:clamp(24px,3.4vw,38px);font-weight:600;line-height:1;color:var(--jt-lake);letter-spacing:.02em}
.jt-section__title{margin:0;font-size:clamp(21px,2.8vw,32px);font-weight:600;letter-spacing:.01em}
.jt-section__meta{margin:10px 0 0;font-size:13px;line-height:1.7;color:var(--jt-mist);max-width:46em}

/* ---------- 跳转链接 ---------- */
.jt-skip{position:fixed;left:14px;top:-70px;z-index:200;display:inline-block;padding:10px 16px;background:var(--jt-accent);color:var(--jt-deep);font-size:13px;font-weight:600;letter-spacing:.1em;text-decoration:none;border-radius:var(--jt-radius);transition:top .2s var(--jt-ease)}
.jt-skip:focus{top:14px;color:var(--jt-deep)}

/* ---------- 头部 ---------- */
.jt-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  color:var(--jt-fog);
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .35s var(--jt-ease),border-color .35s var(--jt-ease),box-shadow .35s var(--jt-ease);
}
.jt-header::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(180deg,rgba(8,17,20,.80),rgba(8,17,20,.30) 62%,rgba(8,17,20,0));
  opacity:1;transition:opacity .35s var(--jt-ease);
}
.jt-header[data-stuck="true"]{
  background-color:rgba(14,31,36,.97);
  border-bottom-color:var(--jt-line);
  box-shadow:var(--jt-shadow);
}
.jt-header[data-stuck="true"]::before{opacity:0}
.jt-header__inner{
  width:100%;max-width:1440px;margin-inline:auto;
  min-height:var(--jt-header-h);
  padding:0 var(--jt-gutter);
  display:flex;align-items:center;gap:clamp(12px,2.4vw,34px);
}
.jt-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(60,76,80,.45);overflow:hidden}
.jt-progress__fill{display:block;height:100%;width:0;background:var(--jt-accent);transition:width .12s linear}

/* 品牌 */
.jt-brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;text-decoration:none;color:var(--jt-fog)}
.jt-brand:hover{color:var(--jt-fog)}
.jt-brand__mark{
  position:relative;width:38px;height:38px;flex:0 0 auto;display:grid;place-items:center;
  border:1px solid var(--jt-line);border-radius:var(--jt-radius);
  background-color:rgba(22,56,47,.5);
  font-family:var(--jt-font-display);font-size:19px;font-weight:700;line-height:1;
}
.jt-brand__mark::after{content:"";position:absolute;right:-1px;bottom:-1px;width:10px;height:10px;border-right:2px solid var(--jt-accent);border-bottom:2px solid var(--jt-accent)}
.jt-brand__text{display:flex;flex-direction:column;line-height:1.15}
.jt-brand__line{font-family:var(--jt-font-display);font-size:19px;font-weight:700;letter-spacing:.18em}
.jt-brand__tagline{font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.22em;color:var(--jt-mist)}

/* 导航 */
.jt-nav{display:flex;flex:1 1 auto;align-items:center;justify-content:flex-end;gap:clamp(10px,1.8vw,26px);margin-left:auto}
.jt-nav__list{display:flex;align-items:center;gap:clamp(2px,1.2vw,16px);list-style:none;margin:0;padding:0}
.jt-nav__link{
  position:relative;display:inline-block;padding:10px 2px;
  color:var(--jt-fog);text-decoration:none;font-size:14px;letter-spacing:.08em;
  transition:color .25s var(--jt-ease);
}
.jt-nav__link::after{
  content:"";position:absolute;left:2px;right:2px;bottom:2px;height:2px;
  background:var(--jt-accent);transform:scaleX(0);transform-origin:left center;
  transition:transform .3s var(--jt-ease);
}
.jt-nav__link:hover{color:#fff}
.jt-nav__link:hover::after{transform:scaleX(.4)}
.jt-nav__link[aria-current="page"]{color:#fff;font-weight:600}
.jt-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.jt-nav__side{display:flex;align-items:center;gap:12px;padding-left:clamp(10px,1.6vw,22px);border-left:1px solid var(--jt-line-soft)}
.jt-axis{
  appearance:none;background:transparent;border:1px solid var(--jt-line);border-radius:var(--jt-radius);
  color:var(--jt-mist);font:inherit;font-size:12px;letter-spacing:.14em;padding:8px 12px;cursor:pointer;
  transition:color .25s var(--jt-ease),border-color .25s var(--jt-ease),background-color .25s var(--jt-ease);
}
.jt-axis::before{content:"";display:inline-block;width:6px;height:6px;margin-right:8px;border-radius:50%;background:var(--jt-line);vertical-align:middle;transition:background-color .25s var(--jt-ease)}
.jt-axis:hover{border-color:var(--jt-link);color:var(--jt-fog)}
.jt-axis[aria-pressed="true"]{color:var(--jt-fog);border-color:var(--jt-lake);background-color:rgba(46,110,126,.16)}
.jt-axis[aria-pressed="true"]::before{background:var(--jt-accent)}

/* 移动导航按钮 */
.jt-navtoggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  appearance:none;background-color:rgba(8,17,20,.55);border:1px solid var(--jt-line);border-radius:var(--jt-radius);
  color:var(--jt-fog);font-size:12px;letter-spacing:.18em;padding:9px 12px;cursor:pointer;
  transition:border-color .25s var(--jt-ease),background-color .25s var(--jt-ease);
}
.jt-navtoggle:hover{border-color:var(--jt-link)}
.jt-navtoggle__bars{position:relative;display:block;width:18px;height:10px}
.jt-navtoggle__bars::before,.jt-navtoggle__bars::after{content:"";position:absolute;left:0;right:0;height:1px;background:currentColor;transition:transform .3s var(--jt-ease),top .3s var(--jt-ease)}
.jt-navtoggle__bars::before{top:1px}
.jt-navtoggle__bars::after{top:9px}
.jt-header[data-open="true"] .jt-navtoggle__bars::before{top:5px;transform:rotate(45deg)}
.jt-header[data-open="true"] .jt-navtoggle__bars::after{top:5px;transform:rotate(-45deg)}

/* ---------- 按钮 ---------- */
.jt-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  min-height:42px;padding:9px 18px;border:1px solid var(--jt-line);border-radius:var(--jt-radius);
  background-color:transparent;color:var(--jt-fog);
  font-family:var(--jt-font-body);font-size:13px;letter-spacing:.12em;text-decoration:none;cursor:pointer;
  transition:background-color .25s var(--jt-ease),color .25s var(--jt-ease),border-color .25s var(--jt-ease);
}
.jt-btn:hover{background-color:rgba(76,147,168,.16);border-color:var(--jt-link);color:#fff}
.jt-btn--accent{background-color:var(--jt-accent);border-color:var(--jt-accent);color:var(--jt-deep);font-weight:600}
.jt-btn--accent:hover{background-color:#ff8347;border-color:#ff8347;color:var(--jt-deep)}
.jt-btn--ghost{border-color:transparent;background-color:transparent;padding-inline:2px}
.jt-btn--ghost:hover{background-color:transparent;color:var(--jt-accent)}
.jt-btn--block{width:100%}

/* ---------- 面包屑 / 页头 ---------- */
.jt-crumbs{margin:0;font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.1em;color:var(--jt-mist)}
.jt-crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5em;list-style:none;margin:0;padding:0}
.jt-crumbs__list li{display:flex;align-items:center;gap:.5em}
.jt-crumbs__list li+li::before{content:"/";color:var(--jt-line)}
.jt-crumbs a{color:var(--jt-mist);text-decoration:none}
.jt-crumbs a:hover{color:var(--jt-link)}
.jt-crumbs [aria-current="page"]{color:var(--jt-fog)}

.jt-pagehead{
  position:relative;margin-top:var(--jt-header-h);
  padding:clamp(42px,7vw,86px) 0 clamp(26px,4vw,48px);
  border-bottom:1px solid var(--jt-line-hair);
}
.jt-pagehead__kicker{margin:0 0 14px;font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.3em;color:var(--jt-mist)}
.jt-pagehead__title{margin:0 0 14px;font-size:clamp(30px,5.4vw,54px);font-weight:700;line-height:1.14;letter-spacing:-.01em}
.jt-pagehead__meta{margin:0;font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.1em;color:var(--jt-mist)}

/* ---------- 卡片 / 数据 ---------- */
.jt-card{
  position:relative;
  background-color:rgba(22,56,47,.42);
  border:1px solid var(--jt-line-soft);border-radius:var(--jt-radius);
  padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--jt-shadow);
}
.jt-card--flat{background-color:rgba(14,31,36,.6);box-shadow:none}
.jt-card__head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:10px;margin-bottom:14px;padding-bottom:12px;border-bottom:1px solid var(--jt-line-hair)}
.jt-card__title{margin:0;font-size:16px;font-weight:600;letter-spacing:.04em}

.jt-stat{display:flex;flex-direction:column;gap:8px;padding:16px 18px;border-left:1px solid var(--jt-line);background-color:rgba(22,56,47,.3)}
.jt-stat__value{font-family:var(--jt-font-mono);font-size:clamp(26px,3.4vw,38px);line-height:1;color:var(--jt-fog)}
.jt-stat__label{font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.14em;color:var(--jt-mist)}
.jt-stat--accent{border-left-color:var(--jt-accent)}
.jt-stat--accent .jt-stat__value{color:var(--jt-accent)}

.jt-bar{position:relative;height:6px;width:100%;background-color:rgba(60,76,80,.42);border-radius:1px;overflow:hidden}
.jt-bar__fill{display:block;height:100%;width:0;background-color:var(--jt-lake);transition:width .6s var(--jt-ease)}
.jt-bar--accent .jt-bar__fill{background-color:var(--jt-accent)}
.jt-bar--thin{height:3px}

.jt-table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
.jt-table caption{caption-side:top;text-align:left;font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.18em;color:var(--jt-mist);padding-bottom:10px}
.jt-table th,.jt-table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--jt-line-hair)}
.jt-table thead th{font-size:12px;font-weight:500;letter-spacing:.12em;color:var(--jt-mist);border-bottom-color:var(--jt-line)}
.jt-table th.jt-num,.jt-table td.jt-num{text-align:right;font-family:var(--jt-font-mono)}
.jt-table tbody tr{transition:background-color .2s var(--jt-ease)}
.jt-table tbody tr:hover{background-color:rgba(76,147,168,.08)}

.jt-tag{display:inline-flex;align-items:center;gap:.4em;padding:.22em .6em;border:1px solid var(--jt-line);border-radius:var(--jt-radius);background-color:rgba(8,17,20,.45);color:var(--jt-mist);font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.08em}
.jt-tag--accent{border-color:var(--jt-accent);color:var(--jt-accent)}
.jt-tag--sand{border-color:rgba(196,183,156,.45);color:var(--jt-sand)}
.jt-tag--lake{border-color:var(--jt-lake);color:var(--jt-fog)}

/* ---------- 图像容器（供页面阶段放置图片 / 内联 SVG） ---------- */
.jt-media{
  position:relative;display:block;overflow:hidden;
  border:1px solid var(--jt-line-soft);border-radius:var(--jt-radius);
  background-color:var(--jt-moss);
  background-image:linear-gradient(155deg,rgba(46,110,126,.5),rgba(8,17,20,.95));
}
.jt-media::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(rgba(127,168,174,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(127,168,174,.16) 1px,transparent 1px);
  background-size:48px 48px;
}
.jt-media>img,.jt-media>svg,.jt-media>video{display:block;width:100%;height:100%;object-fit:cover;filter:saturate(.72) contrast(1.06) brightness(.85)}
.jt-media--pano{aspect-ratio:21/9}
.jt-media--wide{aspect-ratio:16/9}
.jt-media--square{aspect-ratio:1/1}
.jt-media--tall{aspect-ratio:3/4}
.jt-media--fluid{aspect-ratio:auto;min-height:180px}
.jt-media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:14px 16px;font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.14em;color:var(--jt-fog);
  background:linear-gradient(0deg,rgba(8,17,20,.94),rgba(8,17,20,0));
}
.jt-media__tag{position:absolute;top:12px;left:12px;z-index:2}

/* ---------- 章节目录 / 返回顶部 ---------- */
.jt-toc{position:fixed;left:clamp(12px,2vw,28px);top:50%;transform:translateY(-50%);z-index:60;display:none}
.jt-toc__list{position:relative;list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.jt-toc__list::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:1px;background-color:var(--jt-line)}
.jt-toc__item{margin:0}
.jt-toc__link{
  position:relative;display:block;padding:6px 0 6px 14px;max-width:15ch;
  font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--jt-mist);text-decoration:none;
  transition:color .25s var(--jt-ease);
}
.jt-toc__link::before{content:"";position:absolute;left:-1px;top:50%;width:1px;height:0;background-color:var(--jt-accent);transform:translateY(-50%);transition:height .3s var(--jt-ease)}
.jt-toc__link:hover{color:var(--jt-fog)}
.jt-toc__item[data-active="true"] .jt-toc__link{color:var(--jt-accent)}
.jt-toc__item[data-active="true"] .jt-toc__link::before{height:100%}

.jt-backtop{
  position:fixed;right:clamp(14px,2.4vw,30px);bottom:clamp(14px,2.4vw,30px);z-index:70;
  width:46px;height:46px;display:grid;place-items:center;
  border:1px solid var(--jt-line);border-radius:50%;
  background-color:rgba(8,17,20,.88);color:var(--jt-fog);
  font-family:var(--jt-font-mono);font-size:16px;line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .3s var(--jt-ease),transform .3s var(--jt-ease),visibility .3s var(--jt-ease),border-color .25s var(--jt-ease),color .25s var(--jt-ease);
}
.jt-backtop[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.jt-backtop:hover{border-color:var(--jt-accent);color:var(--jt-accent)}

/* ---------- 页脚 ---------- */
.jt-footer{position:relative;margin-top:clamp(60px,9vw,140px);background-color:var(--jt-deep);color:var(--jt-mist);border-top:1px solid var(--jt-line)}
.jt-footer__band{
  display:block;height:3px;width:100%;
  background:linear-gradient(90deg,
    var(--jt-moss) 0 38%,
    var(--jt-lake) 38% 68%,
    var(--jt-mist) 68% 82%,
    var(--jt-accent) 82% 100%);
}
.jt-footer__inner{
  width:100%;max-width:var(--jt-max);margin-inline:auto;
  padding:clamp(38px,6vw,72px) var(--jt-gutter) clamp(28px,4vw,48px);
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,2fr) minmax(0,1.25fr);
  gap:clamp(28px,4vw,56px);align-items:start;
}
.jt-footer__lead{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.jt-footer__brand{
  width:100%;margin:0;padding-bottom:10px;border-bottom:1px solid var(--jt-line);
  font-family:var(--jt-font-display);font-size:24px;font-weight:700;letter-spacing:.18em;
  color:var(--jt-fog);text-decoration:none;
}
.jt-footer__brand:hover{color:var(--jt-accent)}
.jt-footer__tagline{margin:0;font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.2em;color:var(--jt-mist)}
.jt-footer__colophon{margin:0;max-width:22em;font-size:13px;line-height:1.7;color:var(--jt-mist)}
.jt-footer__nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,32px)}
.jt-footer__col{min-width:0}
.jt-footer__title{margin:0 0 14px;font-family:var(--jt-font-mono);font-size:12px;font-weight:600;letter-spacing:.2em;color:var(--jt-fog)}
.jt-footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}
.jt-footer__link{display:inline-block;color:var(--jt-mist);text-decoration:none;font-size:14px;transition:color .25s var(--jt-ease),transform .25s var(--jt-ease)}
.jt-footer__link:hover{color:var(--jt-accent);transform:translateX(3px)}
.jt-footer__contact{border:1px solid var(--jt-line);border-radius:var(--jt-radius);background-color:rgba(14,31,36,.7);padding:clamp(18px,2.4vw,26px)}
.jt-footer__contact-line{margin:0 0 12px;font-size:13px;line-height:1.6;color:var(--jt-fog);word-break:break-all}
.jt-footer__key{display:block;margin-bottom:2px;font-family:var(--jt-font-mono);font-size:11px;letter-spacing:.2em;color:var(--jt-mist)}
.jt-footer__note{margin:14px 0 0;padding-top:14px;border-top:1px solid var(--jt-line-hair);font-size:12px;line-height:1.7;color:var(--jt-mist)}
.jt-footer__legal{
  width:100%;max-width:var(--jt-max);margin-inline:auto;
  padding:18px var(--jt-gutter) 26px;border-top:1px solid var(--jt-line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;
  font-family:var(--jt-font-mono);font-size:12px;letter-spacing:.08em;color:var(--jt-mist);
}
.jt-footer__legal-item{margin:0}

/* ---------- 显现与轴向开关 ---------- */
.jt-reveal{transition:opacity .5s var(--jt-ease),transform .5s var(--jt-ease)}
[data-js="on"] .jt-reveal,[data-js="on"] [data-reveal]{opacity:0;transform:translateY(16px)}
[data-js="on"] .jt-reveal[data-revealed="true"],[data-js="on"] [data-reveal][data-revealed="true"]{opacity:1;transform:none}
[data-js="on"] .jt-stat__value{opacity:0;transition:opacity .2s ease-out}
[data-js="on"] .jt-stat[data-revealed="true"] .jt-stat__value{opacity:1}
[data-axis="off"] [data-axis-panel]{display:none !important}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .jt-footer__inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .jt-footer__lead{grid-column:1/-1}
  .jt-footer__contact{grid-column:1/-1}
}
@media (max-width:960px){
  .jt-header__inner{justify-content:space-between}
  .jt-navtoggle{display:inline-flex}
  .jt-nav{
    position:fixed;top:var(--jt-header-h);left:0;right:0;z-index:79;
    max-height:calc(100vh - var(--jt-header-h));overflow-y:auto;
    flex:0 0 auto;margin:0;padding:16px var(--jt-gutter) 30px;
    flex-direction:column;align-items:stretch;justify-content:flex-start;gap:16px;
    background-color:rgba(8,17,20,.98);
    border-top:1px solid var(--jt-line-hair);border-bottom:1px solid var(--jt-line);
    transform:translateY(-10px);opacity:0;visibility:hidden;pointer-events:none;
    transition:opacity .28s var(--jt-ease),transform .28s var(--jt-ease),visibility .28s var(--jt-ease);
  }
  .jt-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .jt-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .jt-nav__item{border-bottom:1px solid var(--jt-line-hair)}
  .jt-nav__item:last-child{border-bottom:0}
  .jt-nav__link{display:block;padding:15px 2px;font-size:16px;letter-spacing:.12em}
  .jt-nav__link::after{left:2px;right:auto;bottom:9px;width:18px}
  .jt-nav__link:hover::after{transform:scaleX(1)}
  .jt-nav__side{flex-direction:column;align-items:stretch;gap:12px;padding:16px 0 0;border-left:0;border-top:1px solid var(--jt-line-hair)}
  .jt-nav__cta{width:100%}
  .jt-axis{text-align:center}
  html[data-nav-open="true"]{overflow:hidden}
}
@media (max-width:900px){
  .jt-col-3,.jt-col-4,.jt-col-5{grid-column:span 6}
  .jt-col-7,.jt-col-8,.jt-col-9{grid-column:span 12}
  .jt-section__head{grid-template-columns:minmax(0,1fr);gap:10px}
}
@media (max-width:768px){
  :root{--jt-header-h:60px}
  .jt-nav__side{gap:10px}
  .jt-footer__legal{justify-content:flex-start}
}
@media (max-width:640px){
  .jt-col-3,.jt-col-4,.jt-col-5,.jt-col-6{grid-column:span 12}
  .jt-footer__inner{grid-template-columns:minmax(0,1fr)}
  .jt-footer__nav{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .jt-brand__tagline{display:none}
}
@media (max-width:420px){
  .jt-footer__nav{grid-template-columns:minmax(0,1fr)}
}
@media (min-width:1241px){
  .jt-toc{display:block}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  [data-js="on"] .jt-reveal,[data-js="on"] [data-reveal]{opacity:1;transform:none}
  [data-js="on"] .jt-stat__value{opacity:1}
  .jt-progress__fill{transition:none}
}