/* =========================================================
   金宝博赛事 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================= */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- 变量 ---------- */
:root{
  --gold:#C8A227;
  --gold-lt:#E7CC6A;
  --navy:#0B1B33;
  --navy-2:#16304F;
  --orange:#FF6B2C;
  --mint:#3FBFA0;
  --teal:#0E4F4A;
  --wine:#5A1E2E;
  --indigo:#3A2A6B;
  --paper:#F5F2EA;
  --ink:#1A1A1F;
  --muted:#7C8AA0;

  --soft:rgba(26,26,31,.62);
  --line:rgba(200,162,39,.34);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","DIN Alternate",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --pad-x:clamp(18px,4.2vw,60px);
  --wide:1280px;
  --read:38em;
  --head-h:74px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --r:2px;
}

/* 深色上下文统一改写次要文字与细线 */
.kb-panel--deep,
.kb-panel--navy2,
.kb-panel--teal,
.kb-panel--wine,
.kb-panel--indigo,
.kb-footer,
.kb-header{
  --soft:rgba(245,242,234,.66);
  --line:rgba(231,204,106,.28);
}

/* ---------- 排版 ---------- */
.kb-h1{font-size:clamp(2.05rem,5.6vw,3.9rem);line-height:1.06;font-weight:900;letter-spacing:-.015em}
.kb-h2{font-size:clamp(1.5rem,3.2vw,2.3rem);line-height:1.16;font-weight:900;letter-spacing:-.01em}
.kb-h3{font-size:clamp(1.06rem,1.9vw,1.28rem);line-height:1.42;font-weight:800}
.kb-kicker{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.26em;
  color:var(--gold);
  text-transform:uppercase;
}
.kb-num{
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.kb-lede{
  font-size:clamp(1.02rem,1.9vw,1.24rem);
  line-height:1.72;
  color:var(--soft);
  max-width:34em;
}
.kb-prose{font-size:clamp(1rem,1.5vw,1.0625rem);line-height:1.85;max-width:var(--read)}
.kb-prose p + p{margin-top:1em}
.kb-prose strong{font-weight:800}
.kb-prose a{color:var(--gold);text-decoration:none;border-bottom:1px solid var(--line)}
.kb-caption{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--soft);
}
.kb-sr{
  position:absolute !important;
  width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 容器与面板 ---------- */
.kb-wrap{
  width:100%;
  max-width:var(--wide);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.kb-narrow{max-width:var(--read)}
.kb-main{display:block;min-height:60vh}

.kb-panel{position:relative;padding-block:clamp(48px,7vw,96px)}
.kb-panel--tight{padding-block:clamp(30px,4.4vw,58px)}
.kb-panel--paper{background-color:var(--paper);color:var(--ink)}
.kb-panel--deep{background-color:var(--navy);color:var(--paper)}
.kb-panel--navy2{background-color:var(--navy-2);color:var(--paper)}
.kb-panel--teal{background-color:var(--teal);color:var(--paper)}
.kb-panel--wine{background-color:var(--wine);color:var(--paper)}
.kb-panel--indigo{background-color:var(--indigo);color:var(--paper)}
.kb-panel + .kb-panel{border-top:1px solid var(--line)}

.kb-offset-l{margin-inline-start:clamp(0px,5vw,96px)}
.kb-offset-r{margin-inline-end:clamp(0px,5vw,96px)}

/* ---------- 编号章节 ---------- */
.kb-chapter{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:clamp(18px,3vw,44px);
  align-items:start;
}
.kb-rail{display:flex;align-items:flex-start;gap:10px}
.kb-rail__num{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(2rem,4.6vw,3.2rem);
  line-height:.95;
  letter-spacing:-.03em;
  color:var(--gold);
  font-variant-numeric:tabular-nums;
}
.kb-rail__note{
  writing-mode:vertical-rl;
  padding-top:6px;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.32em;
  color:var(--soft);
  text-transform:uppercase;
}
.kb-chapter__body{min-width:0}
.kb-chapter__title{
  margin:2px 0 14px;
  font-size:clamp(1.6rem,3.6vw,2.6rem);
  line-height:1.14;
  font-weight:900;
  letter-spacing:-.01em;
}

/* ---------- 参数指标 ---------- */
.kb-metrics{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(158px,1fr));
  border-top:1px solid var(--line);
  border-left:1px solid var(--line);
}
.kb-metric{
  padding:18px 18px 22px;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.kb-metric__value{
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(1.7rem,3.6vw,2.5rem);
  line-height:1;
  letter-spacing:-.01em;
  color:var(--gold);
  font-variant-numeric:tabular-nums;
}
.kb-metric__unit{
  margin-left:.18em;
  font-size:.46em;
  letter-spacing:.14em;
  color:var(--soft);
}
.kb-metric__label{
  margin-top:10px;
  font-size:.7rem;
  letter-spacing:.18em;
  color:var(--soft);
}

/* ---------- 网格与卡片 ---------- */
.kb-grid{
  display:grid;
  gap:clamp(16px,2.2vw,28px);
  grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr));
}
.kb-grid--2{grid-template-columns:repeat(auto-fit,minmax(min(340px,100%),1fr))}
.kb-grid--tight{gap:14px}

.kb-card{
  position:relative;
  min-width:0;
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);
  border-radius:var(--r);
}
.kb-card__head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:8px 14px;
  margin-bottom:10px;
}
.kb-card__title{font-size:1.02rem;font-weight:800;line-height:1.4}
.kb-card__meta{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--soft);
}
.kb-card__body{font-size:.94rem;line-height:1.75;color:var(--soft)}

.kb-tag{
  display:inline-flex;
  align-items:center;
  gap:.4em;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  color:var(--gold);
  white-space:nowrap;
}

/* ---------- 按钮 ---------- */
.kb-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5em;
  padding:12px 22px;
  border:1px solid var(--gold);
  border-radius:var(--r);
  background-color:transparent;
  color:inherit;
  font-size:.9rem;
  letter-spacing:.1em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.kb-btn:hover{background-color:var(--gold);color:var(--navy)}
.kb-btn--solid{background-color:var(--gold);color:var(--navy);border-color:var(--gold)}
.kb-btn--solid:hover{background-color:var(--gold-lt);border-color:var(--gold-lt);color:var(--navy)}
.kb-btn--flame{background-color:var(--orange);border-color:var(--orange);color:#fff}
.kb-btn--flame:hover{background-color:#ff8248;border-color:#ff8248;color:#101014}
.kb-btn--quiet{border-color:var(--line)}
.kb-btn--quiet:hover{background-color:transparent;border-color:var(--gold);color:var(--gold)}

/* ---------- 图像容器 ---------- */
.kb-media{
  margin:0;
  border:1px solid var(--line);
  border-radius:var(--r);
  overflow:hidden;
  background:linear-gradient(148deg,var(--navy-2) 0%,var(--navy) 62%,#081426 100%);
}
.kb-media__frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  background-image:
    radial-gradient(120% 90% at 18% 0%,rgba(231,204,106,.14),transparent 62%),
    repeating-linear-gradient(115deg,rgba(231,204,106,.07) 0 2px,transparent 2px 16px);
}
.kb-media__frame img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.kb-media:hover .kb-media__frame img{transform:scale(1.035)}
.kb-media__frame::after{
  content:"";
  position:absolute;
  inset:0;
  box-shadow:inset 0 0 0 1px rgba(231,204,106,.18);
  pointer-events:none;
}
.kb-media figcaption{
  padding:10px 14px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--soft);
}
.kb-media--wide .kb-media__frame{aspect-ratio:21 / 9}
.kb-media--tall .kb-media__frame{aspect-ratio:3 / 4}
.kb-media--square .kb-media__frame{aspect-ratio:1 / 1}

/* ---------- 面包屑 ---------- */
.kb-crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.14em;
  color:var(--soft);
}
.kb-crumbs li{display:flex;align-items:center;gap:10px}
.kb-crumbs li + li::before{content:"/";color:var(--gold)}
.kb-crumbs a{text-decoration:none;border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.kb-crumbs a:hover{color:var(--gold);border-bottom-color:var(--gold)}

/* ---------- 筛选 ---------- */
.kb-filter{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin:0 0 clamp(18px,3vw,30px);
}
.kb-filter__btn{
  appearance:none;
  padding:8px 18px;
  border:1px solid var(--line);
  border-radius:999px;
  background-color:transparent;
  color:inherit;
  font-size:.82rem;
  letter-spacing:.12em;
  cursor:pointer;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.kb-filter__btn:hover{border-color:var(--gold);color:var(--gold)}
.kb-filter__btn[aria-pressed="true"]{background-color:var(--gold);border-color:var(--gold);color:var(--navy)}

/* ---------- 折叠 ---------- */
.kb-fold{border-bottom:1px solid var(--line)}
.kb-fold:first-of-type{border-top:1px solid var(--line)}
.kb-fold__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  width:100%;
  padding:18px 0;
  background:none;
  border:0;
  text-align:left;
  font-size:1rem;
  font-weight:700;
  cursor:pointer;
}
.kb-fold__head::after{
  content:"＋";
  font-family:var(--font-mono);
  font-size:1rem;
  line-height:1;
  color:var(--gold);
}
.kb-fold[data-open] .kb-fold__head::after{content:"－"}
.kb-fold__body{display:none;padding:0 0 22px}
.kb-fold[data-open] .kb-fold__body{display:block;animation:kb-fade .3s var(--ease)}
@keyframes kb-fade{from{opacity:0}to{opacity:1}}

/* ---------- 时间轴 ---------- */
.kb-tl{
  margin:0;
  padding:0 0 0 20px;
  border-left:1px solid var(--line);
}
.kb-tl__item{position:relative;padding:0 0 26px}
.kb-tl__item:last-child{padding-bottom:0}
.kb-tl__item::before{
  content:"";
  position:absolute;
  left:-25px;
  top:8px;
  width:9px;height:9px;
  border-radius:50%;
  background-color:var(--gold);
  box-shadow:0 0 0 3px rgba(200,162,39,.18);
}
.kb-tl__stamp{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.16em;
  color:var(--gold);
}
.kb-tl__title{margin:4px 0 6px;font-size:1rem;font-weight:800}
.kb-tl__text{font-size:.92rem;line-height:1.75;color:var(--soft)}

/* ---------- 显现与条目淡入淡出 ---------- */
.kb-reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .62s var(--ease),transform .62s var(--ease);
}
.kb-reveal--slow{transition-duration:.9s}
.kb-reveal.is-in{opacity:1;transform:none}
.kb-entry{transition:opacity .22s var(--ease)}
.kb-entry.is-out{opacity:0}

/* ---------- 头部 ---------- */
.kb-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  color:var(--paper);
  background-color:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.kb-header[data-scrolled]{
  background-color:var(--navy);
  border-bottom-color:rgba(200,162,39,.32);
  box-shadow:0 14px 38px -26px rgba(0,0,0,.9);
}
.kb-header[data-open]{
  background-color:var(--navy);
  border-bottom-color:rgba(200,162,39,.32);
}
.kb-header__bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(12px,2vw,28px);
  height:var(--head-h);
  width:100%;
  max-width:var(--wide);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.kb-skip{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:12px 20px;
  background-color:var(--gold);
  color:var(--navy);
  font-weight:800;
  text-decoration:none;
}
.kb-skip:focus{left:12px;top:12px}

.kb-brand{
  display:flex;
  flex-direction:column;
  gap:2px;
  min-width:0;
  text-decoration:none;
  color:inherit;
}
.kb-brand__mark{
  font-size:clamp(1rem,2.2vw,1.22rem);
  font-weight:900;
  letter-spacing:.14em;
  color:var(--gold-lt);
  white-space:nowrap;
}
.kb-brand__sub{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.16em;
  color:rgba(245,242,234,.55);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.kb-nav{display:flex;align-items:center;gap:clamp(4px,1.3vw,22px)}
.kb-nav__link{
  position:relative;
  display:block;
  padding:8px 2px;
  font-size:.9rem;
  letter-spacing:.08em;
  color:rgba(245,242,234,.82);
  text-decoration:none;
  transition:color .2s var(--ease);
}
.kb-nav__link::after{
  content:"";
  position:absolute;
  left:0;right:100%;bottom:2px;
  height:1px;
  background-color:var(--gold);
  transition:right .26s var(--ease);
}
.kb-nav__link:hover{color:var(--paper)}
.kb-nav__link:hover::after{right:0}
.kb-nav__link[aria-current="page"]{color:var(--gold-lt)}
.kb-nav__link[aria-current="page"]::after{right:0}

.kb-header__actions{display:flex;align-items:center;gap:10px}
.kb-cta{
  display:inline-flex;
  align-items:center;
  padding:10px 18px;
  border:1px solid var(--gold);
  color:var(--gold-lt);
  font-size:.84rem;
  letter-spacing:.14em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.kb-cta:hover{background-color:var(--gold);border-color:var(--gold);color:var(--navy)}

.kb-navtoggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid rgba(200,162,39,.42);
  background:none;
  color:var(--gold-lt);
  font-size:.78rem;
  letter-spacing:.16em;
  cursor:pointer;
}
.kb-navtoggle__bars{position:relative;display:block;width:22px;height:12px}
.kb-navtoggle__bars::before,
.kb-navtoggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:1.5px;
  background-color:currentColor;
  transition:transform .24s var(--ease);
}
.kb-navtoggle__bars::before{top:0}
.kb-navtoggle__bars::after{bottom:0}
.kb-header[data-open] .kb-navtoggle__bars::before{transform:translateY(5.25px) rotate(45deg)}
.kb-header[data-open] .kb-navtoggle__bars::after{transform:translateY(-5.25px) rotate(-45deg)}
.kb-navtoggle__label{line-height:1}

.kb-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  background-color:var(--orange);
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 页脚 ---------- */
.kb-footer{
  padding-top:clamp(44px,6vw,76px);
  background-color:var(--navy);
  color:var(--paper);
  border-top:1px solid rgba(200,162,39,.32);
}
.kb-footer__top{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 24px;
  padding-bottom:20px;
  border-bottom:1px solid rgba(200,162,39,.24);
}
.kb-footer__mark{
  font-size:clamp(1.15rem,2.4vw,1.5rem);
  font-weight:900;
  letter-spacing:.16em;
  color:var(--gold-lt);
}
.kb-footer__tagline{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.2em;
  color:rgba(245,242,234,.55);
}
.kb-footer__grid{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(22px,3.4vw,44px);
  padding:clamp(28px,4vw,44px) 0 0;
}
.kb-footer__col{min-width:0}
.kb-footer__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.22em;
  color:var(--gold);
}
.kb-footer__list{
  display:grid;
  gap:10px;
  font-size:.9rem;
  line-height:1.7;
  color:rgba(245,242,234,.78);
  overflow-wrap:anywhere;
}
.kb-footer__list a{
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.kb-footer__list a:hover{color:var(--gold-lt);border-bottom-color:var(--gold-lt)}
.kb-footer__meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  margin-top:clamp(30px,4.4vw,52px);
  padding:18px 0 24px;
  border-top:1px solid rgba(200,162,39,.24);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:rgba(245,242,234,.55);
}

/* ---------- 焦点 ---------- */
:focus-visible{outline:2px solid var(--orange);outline-offset:3px}
.kb-nav__link:focus-visible,
.kb-cta:focus-visible,
.kb-footer__list a:focus-visible,
.kb-brand:focus-visible{outline-offset:5px}

/* ---------- 平板 ---------- */
@media (max-width:1180px){
  .kb-nav__link{font-size:.855rem;letter-spacing:.05em}
}

/* ---------- 移动导航断点 ---------- */
@media (max-width:960px){
  :root{--head-h:64px}
  .kb-nav{
    position:fixed;
    top:var(--head-h);
    left:0;right:0;bottom:0;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:14px var(--pad-x) 48px;
    background-color:var(--navy);
    border-top:1px solid rgba(200,162,39,.24);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);
  }
  .kb-header[data-open] .kb-nav{opacity:1;visibility:visible;transform:none}
  .kb-nav__link{
    padding:16px 0;
    font-size:1.06rem;
    border-bottom:1px solid rgba(124,138,160,.22);
  }
  .kb-nav__link::after{display:none}
  .kb-nav__link[aria-current="page"]{padding-left:16px}
  .kb-nav__link[aria-current="page"]::before{
    content:"";
    position:absolute;
    left:0;top:50%;
    width:6px;height:6px;
    background-color:var(--gold);
    transform:translateY(-50%) rotate(45deg);
  }
  .kb-navtoggle{display:inline-flex}
}

@media (max-width:900px){
  .kb-footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:640px){
  .kb-chapter{grid-template-columns:1fr;gap:14px}
  .kb-rail__note{writing-mode:horizontal-tb;padding-top:0}
  .kb-media--wide .kb-media__frame{aspect-ratio:16 / 9}
  .kb-offset-l,.kb-offset-r{margin-inline:0}
}

@media (max-width:560px){
  .kb-cta{padding:8px 12px;font-size:.78rem;letter-spacing:.08em}
  .kb-navtoggle{padding:8px 10px;gap:8px}
  .kb-navtoggle__label{display:none}
  .kb-brand__sub{font-size:.56rem;letter-spacing:.1em}
}

@media (max-width:520px){
  .kb-footer__grid{grid-template-columns:1fr}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .kb-reveal{opacity:1;transform:none}
}