/* =========================================================
   亚博赛场 · /assets/site.css
   共享外壳 + 基础组件（reset / 变量 / 排版 / 头尾 / 通用件）
   ========================================================= */

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
ul,ol,dl,dd{margin:0;padding:0}
li{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:inherit}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
[hidden]{display:none !important}

/* ---------- Design tokens ---------- */
:root{
  --ink:#0B1F17;
  --ink-2:#123328;
  --ink-3:#0F2A20;
  --ink-deep:#071410;
  --yellow:#F5C542;
  --yellow-soft:#FFE8A3;
  --red:#E23B2E;
  --red-deep:#8C1D18;
  --cream:#F4F1E8;
  --grey:#C9D1CC;
  --green:#2F6B57;
  --near-black:#101713;

  --line:rgba(201,209,204,.22);
  --line-strong:rgba(201,209,204,.42);
  --line-dark:rgba(16,23,19,.16);

  --header-h:76px;
  --radius:3px;
  --page-max:1240px;

  --font-display:"Barlow Condensed","Oswald","PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;
  --font-serif:"Noto Serif SC","Songti SC",STSong,"SimSun",serif;
}

/* ---------- Base / 中文排版 ---------- */
body{
  background:var(--ink);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.78;
  letter-spacing:.012em;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.18;
  letter-spacing:-.005em;
  color:var(--cream);
}
p{max-width:44em}
strong{font-weight:700}
small{font-size:13px}
::selection{background:var(--yellow);color:var(--near-black)}

:focus-visible{
  outline:3px solid var(--yellow);
  outline-offset:3px;
  border-radius:2px;
}

#main-content{padding-top:var(--header-h)}

/* ---------- 通用工具 ---------- */
.container{
  width:100%;
  max-width:var(--page-max);
  margin-inline:auto;
  padding-inline:20px;
}
@media (min-width:768px){.container{padding-inline:32px}}
@media (min-width:1200px){.container{padding-inline:48px}}

.visually-hidden{
  position:absolute !important;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);
  white-space:nowrap;border:0;
}

/* ---------- Skip link ---------- */
.skip-link{
  position:fixed;
  top:-120px;left:16px;
  z-index:1200;
  padding:12px 22px;
  background:var(--yellow);
  color:var(--near-black);
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  text-decoration:none;
  border-radius:2px;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 24px;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:800;
  letter-spacing:.04em;
  line-height:1.2;
  text-decoration:none;
  border:2px solid transparent;
  border-radius:2px;
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease;
}
.btn--solid{background:var(--yellow);color:var(--near-black);border-color:var(--yellow)}
.btn--solid:hover{background:var(--cream);border-color:var(--cream)}
.btn--solid:active{background:var(--yellow-soft);border-color:var(--yellow-soft)}
.btn--ghost{background:transparent;color:var(--cream);border-color:var(--line-strong)}
.btn--ghost:hover{border-color:var(--yellow);color:var(--yellow)}
.btn--sm{padding:9px 16px;font-size:13px}
.btn--block{display:flex;width:100%}

/* ---------- 页头 ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:900;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .3s ease,border-color .3s ease,box-shadow .3s ease;
}
.site-header[data-scrolled]{
  background:var(--ink);
  border-bottom-color:rgba(245,197,66,.55);
  box-shadow:0 22px 46px -34px rgba(0,0,0,.95);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:16px;
  min-height:var(--header-h);
}

/* 品牌 */
.brand{
  order:1;
  flex:0 0 auto;
  display:flex;
  flex-direction:column;
  gap:2px;
  text-decoration:none;
  line-height:1.1;
}
.brand__name{
  display:block;
  font-family:var(--font-display);
  font-size:21px;
  font-weight:900;
  letter-spacing:.08em;
  color:var(--cream);
}
.brand__mark{
  display:inline-block;
  width:7px;height:7px;
  margin-left:7px;
  background:var(--yellow);
  transform:translateY(-3px);
}
.brand__line{
  display:block;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:var(--grey);
}

/* 右侧工具区 */
.header-side{
  order:3;
  display:flex;
  align-items:center;
  gap:18px;
  flex:0 0 auto;
}
.header-utility{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(201,209,204,.82);
  white-space:nowrap;
}
.header-utility__dot{
  width:6px;height:6px;
  border-radius:50%;
  background:var(--yellow);
  box-shadow:0 0 0 3px rgba(245,197,66,.16);
}
.header-actions{display:flex;align-items:center}

/* 主导航（桌面） */
.site-nav{order:2;margin-left:auto;display:block}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__link{
  display:block;
  padding:9px 11px;
  font-size:14px;
  font-weight:600;
  letter-spacing:.03em;
  color:rgba(244,241,232,.8);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .2s ease,border-color .2s ease,background-color .2s ease;
}
.site-nav__link:hover{color:var(--cream);border-bottom-color:var(--yellow)}
.site-nav__link[aria-current="page"]{color:var(--yellow);border-bottom-color:var(--yellow)}
.site-nav__cta{display:none}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  background:transparent;
  color:var(--cream);
  border:2px solid var(--line-strong);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--yellow);color:var(--yellow)}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:4px;
  width:22px;height:16px;
}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .26s ease,opacity .2s ease;
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 阅读进度 */
.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  background:var(--yellow);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}

/* 页头响应式 */
@media (max-width:1180px){
  .header-utility{display:none}
}
@media (max-width:960px){
  .nav-toggle{display:inline-flex;position:relative;z-index:960}
  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    width:min(86vw,340px);
    margin:0;
    padding:calc(var(--header-h) + 26px) 22px 36px;
    background:var(--ink-2);
    border-left:2px solid var(--yellow);
    transform:translateX(102%);
    transition:transform .36s cubic-bezier(.22,.72,.24,1);
    overflow-y:auto;
    z-index:940;
  }
  .site-header[data-open] .site-nav{transform:translateX(0)}
  .site-nav__list{display:flex;flex-direction:column;gap:0}
  .site-nav__link{
    padding:15px 8px;
    font-size:16px;
    font-weight:700;
    color:rgba(244,241,232,.84);
    border:0;
    border-bottom:1px solid rgba(201,209,204,.14);
  }
  .site-nav__link:hover{border-bottom-color:var(--yellow)}
  .site-nav__link[aria-current="page"]{
    background:var(--yellow);
    color:var(--near-black);
    padding-left:16px;
    border-bottom-color:var(--yellow);
  }
  .site-nav__cta{display:block;margin-top:24px}
}
@media (max-width:560px){
  :root{--header-h:64px}
  .header-actions{display:none}
  .brand__name{font-size:18px}
  .brand__line{font-size:9px;letter-spacing:.18em}
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink-deep);
  border-top:2px solid var(--yellow);
  color:var(--grey);
  margin-top:0;
}
.footer-main{
  display:grid;
  gap:38px;
  padding-block:56px 40px;
}
@media (min-width:820px){
  .footer-main{grid-template-columns:minmax(0,1.5fr) minmax(0,1fr) minmax(0,1.35fr);gap:48px}
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:900;
  letter-spacing:.1em;
  color:var(--cream);
  max-width:none;
}
.footer-brand__summary{
  margin-top:12px;
  font-size:14px;
  line-height:1.85;
  color:rgba(201,209,204,.82);
  max-width:34em;
}
.footer-brand__legal{
  margin-top:16px;
  display:inline-block;
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--grey);
  border:1px solid var(--line);
  border-radius:2px;
}
.footer-links__title,
.footer-contact__title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--yellow);
  margin-bottom:14px;
  max-width:none;
}
.footer-links__list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:2px 18px;
}
.footer-links__list a{
  display:inline-block;
  padding:5px 0;
  font-size:14px;
  color:rgba(201,209,204,.86);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-links__list a:hover{color:var(--yellow);border-bottom-color:var(--yellow)}

.footer-contact__list{display:block}
.footer-contact__row{
  display:grid;
  grid-template-columns:56px minmax(0,1fr);
  gap:10px;
  align-items:start;
  padding:9px 0;
  border-bottom:1px solid var(--line);
}
.footer-contact__row dt{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.7;
  letter-spacing:.12em;
  color:rgba(201,209,204,.65);
  padding-top:3px;
}
.footer-contact__row dd{
  font-size:14px;
  line-height:1.7;
  color:var(--cream);
  word-break:break-word;
}
.footer-contact__value{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.01em;
}
.footer-copy{
  margin-left:10px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--grey);
  background:transparent;
  border:1px solid var(--line-strong);
  border-radius:2px;
  cursor:pointer;
  vertical-align:middle;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.footer-copy:hover{background:var(--yellow);color:var(--near-black);border-color:var(--yellow)}
.footer-copy[data-copied]{background:var(--yellow);color:var(--near-black);border-color:var(--yellow)}
.footer-contact__note{
  margin-top:16px;
  font-size:12.5px;
  line-height:1.8;
  color:rgba(201,209,204,.62);
  max-width:38em;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  padding-block:18px 30px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(201,209,204,.68);
}
.footer-bottom__copy,
.footer-bottom__icp{margin:0;max-width:none}

/* ---------- 通用分区 ---------- */
.section{padding-block:64px}
@media (min-width:900px){.section{padding-block:88px}}
.section--cream{background:var(--cream);color:var(--near-black)}
.section--cream h1,
.section--cream h2,
.section--cream h3,
.section--cream h4{color:var(--near-black)}
.section--cream .section-note{color:#4B5A52}
.section--cream .section-head{border-bottom-color:var(--line-dark)}
.section--cream .lede{color:#2B3A33}
.section--cream p{color:#2B3A33}

.hero-bleed{
  margin-top:calc(var(--header-h) * -1);
  padding-top:calc(var(--header-h) + 44px);
}

/* 章节头 */
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 16px;
  padding-bottom:14px;
  margin-bottom:30px;
  border-bottom:1px solid var(--line);
}
.section-num{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.16em;
  color:var(--yellow);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3.4vw,34px);
  font-weight:900;
  line-height:1.2;
}
.section-note{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--grey);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--yellow);
  text-transform:uppercase;
}
.lede{
  font-size:clamp(17px,1.9vw,20px);
  line-height:1.75;
  color:rgba(244,241,232,.86);
  max-width:44em;
}

/* 网格 */
.grid{display:grid;gap:20px}
.grid--2,
.grid--3,
.grid--split{grid-template-columns:minmax(0,1fr)}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:960px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:36px}
}

/* 卡片 */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:22px 22px 20px;
  background:var(--ink-2);
  border:2px solid var(--line);
  border-radius:var(--radius);
  transition:border-color .22s ease,transform .22s ease,background-color .22s ease;
}
.card:hover{border-color:var(--yellow);transform:translateY(-3px)}
.card__index{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--yellow);
}
.card__title{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:800;
  line-height:1.35;
  letter-spacing:0;
}
.card__text{
  font-size:15px;
  line-height:1.75;
  color:rgba(244,241,232,.82);
  max-width:none;
}
.card__foot{
  margin-top:auto;
  padding-top:12px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:6px 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--grey);
}
.card--light{
  background:var(--cream);
  border-color:var(--line-dark);
  color:var(--near-black);
}
.card--light .card__title{color:var(--near-black)}
.card--light .card__text{color:#33443B}
.card--light .card__index{color:var(--red-deep)}
.card--light .card__foot{border-top-color:var(--line-dark);color:#4B5A52}
.card--alert{border-color:var(--red)}
.card--alert .card__index{color:var(--red)}

/* 筛选芯片 */
.chip-group{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:7px 15px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--grey);
  background:transparent;
  border:2px solid var(--line);
  border-radius:999px;
  cursor:pointer;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.chip:hover{border-color:var(--yellow);color:var(--yellow)}
.chip[aria-pressed="true"]{
  background:var(--yellow);
  border-color:var(--yellow);
  color:var(--near-black);
  font-weight:700;
}
.filter-empty{
  padding:26px 0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--grey);
}

/* 图片容器（页面阶段放图） */
.media-frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  background:var(--ink-2);
  border:2px solid var(--line);
  border-radius:var(--radius);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-frame__caption{
  position:absolute;
  left:0;bottom:0;
  padding:6px 12px;
  background:rgba(7,20,16,.86);
  color:var(--yellow);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
}

/* 时间轴 */
.timeline{
  border-left:2px solid var(--line);
  padding-left:0;
}
.timeline__item{
  position:relative;
  padding:0 0 22px 22px;
}
.timeline__item::before{
  content:"";
  position:absolute;
  left:-7px;top:7px;
  width:12px;height:12px;
  border-radius:50%;
  background:var(--ink);
  border:2px solid var(--line-strong);
  transition:background-color .25s ease,border-color .25s ease,box-shadow .25s ease;
}
.timeline__item[data-active]::before{
  background:var(--yellow);
  border-color:var(--yellow);
  box-shadow:0 0 0 4px rgba(245,197,66,.18);
}
.timeline__tag{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--yellow);
}
.timeline__text{
  font-size:14px;
  line-height:1.75;
  color:rgba(244,241,232,.82);
  max-width:40em;
}

/* 折叠面板 */
.accordion{border-top:2px solid var(--line)}
.accordion__item{border-bottom:1px solid var(--line)}
.accordion__trigger{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 0;
  background:none;
  border:0;
  color:inherit;
  font-family:inherit;
  font-size:16px;
  font-weight:700;
  text-align:left;
  cursor:pointer;
  transition:color .2s ease;
}
.accordion__trigger:hover{color:var(--yellow)}
.accordion__icon{
  position:relative;
  flex:0 0 auto;
  width:14px;height:14px;
}
.accordion__icon::before,
.accordion__icon::after{
  content:"";
  position:absolute;
  top:50%;left:0;
  width:100%;height:2px;
  background:currentColor;
  transform:translateY(-50%);
  transition:transform .22s ease;
}
.accordion__icon::after{transform:translateY(-50%) rotate(90deg)}
.accordion__item[data-open] .accordion__icon::after{transform:translateY(-50%) rotate(0deg)}
.accordion__panel{
  display:none;
  padding:0 0 20px;
  font-size:15px;
  line-height:1.8;
  color:rgba(244,241,232,.82);
}
.accordion__item[data-open] .accordion__panel{display:block}

/* 面包屑 */
.breadcrumb{padding-block:18px 0}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--grey);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{
  color:rgba(201,209,204,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.breadcrumb__link:hover{color:var(--yellow);border-bottom-color:var(--yellow)}
.breadcrumb__sep{color:rgba(201,209,204,.42)}

/* 滚动显现 */
[data-reveal-root] [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .55s ease,transform .55s ease;
}
[data-reveal-root] [data-reveal][data-reveal-visible]{
  opacity:1;
  transform:none;
}

/* ---------- 无障碍动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal-root] [data-reveal]{opacity:1 !important;transform:none !important}
  .card:hover{transform:none}
  .site-nav{transition:none}
}