/* =========================================================
   大江赛场 · 共享站点样式 /assets/site.css
   ========================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:128px}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ol,ul{margin:0}
ol,ul{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}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px}

/* ---------- 2. 设计变量 ---------- */
:root{
  --teal:#0B3B3C;
  --teal-deep:#062526;
  --orange:#FF6A1A;
  --orange-soft:#FFB27A;
  --aqua:#1FA7A0;
  --sand:#E9DCC6;
  --steel:#C7CDC9;
  --paper:#F8F6F0;
  --ink:#121918;
  --danger:#B23A32;
  --muted:#5C6A66;
  --line:rgba(11,59,60,.16);
  --line-strong:rgba(11,59,60,.34);
  --f-display:"PingFang SC","Helvetica Neue",Arial,"Microsoft YaHei",system-ui,sans-serif;
  --f-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --f-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --shell:1240px;
  --rail-w:56px;
  --gutter:28px;
  --radius:2px;
  --edge:6px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  background-color:var(--paper);
  background-image:
    repeating-linear-gradient(0deg,rgba(11,59,60,.028) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(11,59,60,.028) 0 1px,transparent 1px 44px);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:17px;
  line-height:1.8;
  font-weight:400;
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:900;letter-spacing:-.02em;line-height:1.14}
h1{font-size:clamp(32px,5vw,56px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,24px)}
strong{font-weight:800}
.h-section{font-family:var(--f-display);font-weight:900;font-size:clamp(28px,4vw,40px);line-height:1.1;letter-spacing:-.02em}
.h-sub{font-family:var(--f-display);font-weight:800;font-size:24px;line-height:1.3;letter-spacing:-.01em}
.prose{max-width:64ch;font-size:17px;line-height:1.8}
.prose p+p{margin-top:1.2em}
.prose a{color:var(--teal);text-decoration:underline;text-decoration-color:var(--aqua);text-underline-offset:4px}
.prose a:hover{color:var(--orange)}
.num{font-family:var(--f-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

/* ---------- 4. 布局容器 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.page-main{display:block}
.section{padding-block:clamp(44px,6vw,88px)}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--3-2{grid-template-columns:minmax(0,3fr) minmax(0,2fr)}
.grid--2-3{grid-template-columns:minmax(0,2fr) minmax(0,3fr)}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--3-2,.grid--2-3{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 5. skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:12px 22px;
  background:var(--orange);color:var(--teal-deep);
  font-size:14px;font-weight:800;letter-spacing:.06em;text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------- 6. 头部框架 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--teal);
  color:var(--paper);
  border-bottom:1px solid rgba(6,37,38,.9);
}
.site-header::before{
  content:"";display:block;height:var(--edge);
  background:linear-gradient(90deg,var(--orange) 0 96px,var(--orange-soft) 96px 148px,var(--teal-deep) 148px 100%);
}
.header-frame{
  display:flex;flex-wrap:wrap;align-items:center;
  gap:0 24px;
  max-width:var(--shell);margin-inline:auto;
  padding:12px var(--gutter) 0;
}
.brand{
  order:1;flex:0 0 auto;
  display:flex;align-items:center;gap:12px;
  text-decoration:none;color:var(--paper);
}
.brand-mark{
  display:grid;place-items:center;
  width:42px;height:42px;
  background:var(--orange);color:var(--teal-deep);
  font-family:var(--f-mono);font-size:15px;font-weight:700;letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% 70%,86% 100%,0 100%);
  transition:background .18s var(--ease),transform .18s var(--ease);
}
.brand:hover .brand-mark{background:var(--orange-soft);transform:translateY(-2px)}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-name{font-family:var(--f-display);font-size:22px;font-weight:900;letter-spacing:-.02em}
.brand-note{font-size:11px;font-weight:700;letter-spacing:.12em;color:rgba(248,246,240,.62)}

.nav-toggle{
  order:2;margin-left:auto;display:none;align-items:center;gap:10px;
  padding:10px 14px;
  border:1px solid rgba(248,246,240,.3);
  color:var(--paper);
  font-size:12px;font-weight:800;letter-spacing:.14em;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(255,106,26,.18);border-color:var(--orange)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:20px}
.nav-toggle-bar{display:block;height:2px;background:currentColor;transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[data-open="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[data-open="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[data-open="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{white-space:nowrap}

.primary-nav{order:3;flex:1 1 auto;display:flex;justify-content:flex-end}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;gap:2px;justify-content:flex-end}
.nav-item{display:block}
.nav-link{
  position:relative;display:block;
  padding:10px 14px;
  color:var(--paper);
  font-size:15px;font-weight:700;letter-spacing:.02em;text-decoration:none;
  transition:background .18s var(--ease),color .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:5px;height:2px;
  background:var(--orange-soft);
  transform:scaleX(.2);transform-origin:left;opacity:0;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-link:hover{color:#fff}
.nav-link:hover::after{transform:scaleX(1);opacity:1}
.nav-link[aria-current="page"]{background:var(--orange);color:var(--teal-deep);font-weight:800}
.nav-link[aria-current="page"]::after{display:none}

.header-lanes{
  order:4;flex:1 0 100%;
  display:flex;gap:1px;
  margin-top:10px;
  border-top:1px solid rgba(248,246,240,.16);
  background-image:repeating-linear-gradient(90deg,transparent 0 26px,rgba(248,246,240,.05) 26px 28px);
}
.lane-link{
  flex:1 1 0;display:flex;align-items:center;gap:10px;
  padding:9px 16px;
  text-decoration:none;color:rgba(248,246,240,.84);
  font-size:12px;font-weight:800;letter-spacing:.12em;
  border-left:1px solid rgba(248,246,240,.14);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.lane-link:first-child{border-left:0}
.lane-num{font-family:var(--f-mono);font-size:12px;color:var(--orange)}
.lane-name{transition:transform .18s var(--ease)}
.lane-link:hover{background:rgba(255,106,26,.16);color:#fff}
.lane-link:hover .lane-name{transform:translateX(4px)}

.header-progress{height:3px;background:rgba(4,32,31,.85)}
.header-progress-bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--orange),var(--orange-soft))}

/* ---------- 7. 左侧框架边栏 ---------- */
.frame-rail{
  position:fixed;inset:0 auto 0 0;z-index:70;
  width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  gap:14px;padding:20px 0 18px;
  background:var(--teal-deep);
  border-right:1px solid rgba(255,106,26,.32);
}
.rail-mark{writing-mode:vertical-rl;font-size:11px;font-weight:800;letter-spacing:.34em;color:var(--orange-soft)}
.rail-line{flex:1 1 auto;width:2px;margin:16px 0;background:linear-gradient(180deg,rgba(255,106,26,.9),rgba(31,167,160,.55),transparent)}
.rail-note{writing-mode:vertical-rl;font-size:10px;font-weight:700;letter-spacing:.26em;color:rgba(248,246,240,.48)}
.rail-top{
  display:flex;flex-direction:column;align-items:center;gap:4px;
  padding:9px 5px;
  border:1px solid rgba(255,106,26,.5);
  color:var(--orange);
  font-size:10px;font-weight:800;letter-spacing:.1em;
  opacity:0;transform:translateY(6px);pointer-events:none;
  transition:opacity .25s var(--ease),transform .25s var(--ease),background .18s var(--ease),color .18s var(--ease);
}
.rail-top[data-visible="true"]{opacity:1;transform:none;pointer-events:auto}
.rail-top:hover{background:var(--orange);color:var(--teal-deep)}
.rail-top-arrow{font-size:13px;line-height:1}
.rail-top-text{font-size:10px;letter-spacing:.14em}

@media (min-width:1200px){
  body{padding-left:var(--rail-w)}
}
@media (max-width:1199px){
  .frame-rail{
    inset:auto 16px 16px auto;
    width:auto;height:auto;
    flex-direction:row;padding:0;gap:0;
    background:transparent;border:0;
  }
  .rail-mark,.rail-line,.rail-note{display:none}
  .rail-top{
    background:var(--orange);color:var(--teal-deep);border-color:var(--orange);
    padding:10px 14px;
    box-shadow:0 8px 22px rgba(6,37,38,.4);
  }
  .rail-top:hover{background:var(--orange-soft);color:var(--teal-deep)}
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,96px);
  background:var(--teal-deep);
  background-image:
    repeating-linear-gradient(0deg,rgba(248,246,240,.035) 0 1px,transparent 1px 36px),
    repeating-linear-gradient(90deg,rgba(248,246,240,.035) 0 1px,transparent 1px 36px);
  color:rgba(248,246,240,.82);
}
.site-footer::before{
  content:"";position:absolute;right:-8%;bottom:-22%;
  width:540px;height:540px;border-radius:50%;
  background:radial-gradient(circle at 35% 35%,rgba(31,167,160,.22),transparent 62%);
  pointer-events:none;
}
.footer-lanes{
  height:10px;
  background:repeating-linear-gradient(90deg,var(--orange) 0 52px,rgba(255,106,26,.2) 52px 96px);
}
.footer-inner{
  position:relative;
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(40px,6vw,64px) var(--gutter) clamp(32px,4vw,48px);
  display:grid;
  grid-template-columns:1.6fr .9fr .9fr .9fr 1.35fr;
  gap:36px 32px;
}
.footer-brand-col{min-width:0}
.footer-brand{
  font-family:var(--f-display);font-size:clamp(28px,4vw,36px);font-weight:900;
  letter-spacing:-.02em;line-height:1;color:var(--paper);
}
.footer-kicker{
  display:inline-block;margin-top:14px;padding:4px 10px;
  background:var(--orange);color:var(--teal-deep);
  font-size:12px;font-weight:800;letter-spacing:.12em;
}
.footer-summary{
  margin-top:16px;max-width:34ch;
  font-size:15px;line-height:1.85;color:rgba(248,246,240,.72);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--f-body);
  font-size:12px;font-weight:800;letter-spacing:.16em;
  color:var(--orange-soft);
}
.footer-links{display:grid;gap:10px}
.footer-links a{
  position:relative;display:inline-block;
  padding-left:0;
  font-size:15px;text-decoration:none;color:rgba(248,246,240,.78);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-links a::before{
  content:"";position:absolute;left:0;top:50%;width:0;height:2px;
  background:var(--orange);transform:translateY(-50%);
  transition:width .18s var(--ease);
}
.footer-links a:hover{color:var(--paper);padding-left:16px}
.footer-links a:hover::before{width:10px}
.footer-contact{min-width:0}
.contact-list{display:grid;gap:12px;font-size:14px}
.contact-row{
  display:grid;grid-template-columns:44px minmax(0,1fr);gap:10px;
  padding-bottom:10px;border-bottom:1px dashed rgba(248,246,240,.16);
}
.contact-row dt{font-size:11px;font-weight:800;letter-spacing:.14em;color:var(--orange-soft);padding-top:4px}
.contact-row dd{color:rgba(248,246,240,.88);word-break:break-word;line-height:1.7}
.copy-btn{
  display:inline-flex;align-items:center;
  margin-left:8px;padding:2px 8px;
  border:1px solid rgba(255,178,122,.6);
  color:var(--orange-soft);
  font-size:11px;font-weight:800;letter-spacing:.1em;
  vertical-align:baseline;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{background:var(--orange-soft);color:var(--teal-deep)}
.copy-btn[data-copied="true"]{background:var(--aqua);border-color:var(--aqua);color:var(--teal-deep)}
.footer-base{
  position:relative;
  max-width:var(--shell);margin-inline:auto;
  padding:18px var(--gutter) 28px;
  display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  border-top:1px solid rgba(248,246,240,.14);
  font-size:12px;letter-spacing:.08em;color:rgba(248,246,240,.6);
}
.footer-legal{font-family:var(--f-mono);letter-spacing:.04em}
.footer-note{color:rgba(248,246,240,.48)}

@media (max-width:1100px){
  .footer-inner{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-brand-col{grid-column:1/-1}
  .footer-contact{grid-column:1/-1}
}
@media (max-width:700px){
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 24px}
  .footer-contact{grid-column:1/-1}
}
@media (max-width:460px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 9. 通用按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 26px;
  font-size:15px;font-weight:800;letter-spacing:.04em;text-decoration:none;
  border:2px solid transparent;border-radius:0;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%);
  transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn--primary{background:var(--orange);color:var(--teal-deep)}
.btn--primary:hover{background:var(--orange-soft);transform:translate(3px,-2px)}
.btn--ghost{border-color:var(--teal);color:var(--teal);background:transparent}
.btn--ghost:hover{background:var(--teal);color:var(--paper);transform:translate(3px,-2px)}
.btn--dark{background:var(--teal);color:var(--paper)}
.btn--dark:hover{background:var(--teal-deep);transform:translate(3px,-2px)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  background:var(--sand);color:var(--teal);
  border:1px solid var(--line-strong);
  font-size:12px;font-weight:800;letter-spacing:.12em;
}
.tag--hot{background:var(--orange);border-color:var(--orange);color:var(--teal-deep)}
.tag--dusk{background:var(--teal);border-color:var(--teal);color:var(--paper)}

/* ---------- 10. 面包屑与章节标记 ---------- */
.breadcrumb{margin-top:26px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--muted)}
.breadcrumb-list li{display:flex;align-items:center;gap:8px}
.breadcrumb-list li+li::before{content:"／";color:var(--steel)}
.breadcrumb-list a{text-decoration:none;color:var(--teal)}
.breadcrumb-list a:hover{color:var(--orange)}
.breadcrumb-list [aria-current="page"]{color:var(--ink)}
.chapter-marker{
  display:flex;align-items:baseline;gap:14px;
  margin-bottom:18px;padding-bottom:12px;
  border-bottom:2px solid var(--line-strong);
}
.chapter-num{font-family:var(--f-mono);font-size:40px;line-height:.9;font-weight:700;letter-spacing:-.04em;color:var(--orange)}
.chapter-label{font-size:12px;font-weight:800;letter-spacing:.18em;color:var(--teal)}

/* ---------- 11. 表格资料库 ---------- */
.data-table{
  width:100%;font-size:15px;background:var(--paper);
  border:1px solid var(--line-strong);
}
.data-table caption{
  caption-side:top;text-align:left;padding:0 0 10px;
  font-size:12px;font-weight:800;letter-spacing:.14em;color:var(--muted);
}
.data-table th{
  padding:11px 12px;text-align:left;white-space:nowrap;
  background:var(--teal);color:var(--paper);
  font-size:12px;font-weight:800;letter-spacing:.12em;
}
.data-table td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
.data-table tbody tr:nth-child(even){background:rgba(233,220,198,.36)}
.data-table tbody tr:hover{background:rgba(255,178,122,.28)}
.data-table .num{text-align:right}
.data-table th.num{text-align:right}
.table-scroll{overflow-x:auto;border-bottom:3px solid var(--orange)}

/* ---------- 12. 图片容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  background:var(--teal);
  border:2px solid var(--teal-deep);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--band{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-caption{
  margin-top:10px;
  font-size:12px;font-weight:700;letter-spacing:.1em;color:var(--muted);
}

/* ---------- 13. 标签页（配合 data-tabs） ---------- */
.tab-bar{display:flex;flex-wrap:wrap;gap:2px;margin-bottom:24px;border-bottom:2px solid var(--line-strong)}
.tab-btn{
  padding:10px 18px;margin-bottom:-2px;
  color:var(--muted);
  font-size:14px;font-weight:800;letter-spacing:.06em;
  border-bottom:3px solid transparent;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.tab-btn:hover{color:var(--teal);background:rgba(233,220,198,.5)}
.tab-btn[aria-selected="true"]{background:var(--orange);color:var(--teal-deep);border-bottom-color:var(--teal)}
.tab-panel[hidden]{display:none}

/* ---------- 14. 目录与动效协议 ---------- */
[data-toc] a[aria-current="true"]{background:var(--orange);color:var(--teal-deep);font-weight:800}
[data-reveal]{transition:opacity .6s var(--ease),transform .6s var(--ease)}
[data-js="true"] [data-reveal]:not([data-revealed="true"]){opacity:0;transform:translateY(18px)}

/* ---------- 15. 焦点增强 ---------- */
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--orange-soft)}
.footer-links a:focus-visible,.copy-btn:focus-visible{outline-offset:2px}

/* ---------- 16. 断点：头部与栅格 ---------- */
@media (max-width:959px){
  html{scroll-padding-top:112px}
  .nav-toggle{display:inline-flex}
  .primary-nav{
    order:5;flex:1 0 100%;display:none;justify-content:flex-start;
    margin-top:8px;padding:6px 0 10px;
    border-top:1px solid rgba(248,246,240,.16);
  }
  .primary-nav[data-open="true"]{display:block}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    padding:13px 8px;
    font-size:16px;
    border-bottom:1px dashed rgba(248,246,240,.16);
  }
  .nav-link::after{display:none}
  .header-lanes{overflow-x:auto;scrollbar-width:none}
  .header-lanes::-webkit-scrollbar{display:none}
  .lane-link{flex:0 0 auto;min-width:138px;padding:10px 14px}
  .brand-name{font-size:19px}
  .brand-note{display:none}
}
@media (max-width:560px){
  :root{--gutter:18px}
  .header-frame{padding-top:10px}
  .brand-mark{width:36px;height:36px;font-size:13px}
  .brand-name{font-size:17px}
  .nav-toggle{padding:8px 12px}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ---------- 17. 减少动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .btn:hover,.brand:hover .brand-mark{transform:none}
  [data-reveal],[data-js="true"] [data-reveal]:not([data-revealed="true"]){opacity:1;transform:none}
  .rail-top{opacity:1;transform:none;pointer-events:auto}
}