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

/* ============ TOKENS ============ */
:root{
  --flame:#C8102E;
  --ember:#E2452B;
  --gold:#D6A24A;
  --ink-green:#0E3B2E;
  --sand:#EADFCB;
  --paper:#F6F3ED;
  --ink:#0B0C0D;
  --steel:#6E8FA3;
  --steel-dark:#2A3B47;
  --moss:#2F7A5C;
  --line:#D7D2C7;

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

  --rail-w:248px;
  --head-meta-h:30px;
  --head-bar-h:62px;
  --head-h:calc(var(--head-meta-h) + var(--head-bar-h));
  --content-max:1440px;
  --gutter:24px;
  --pad:clamp(16px,3vw,48px);
  --ease:cubic-bezier(.2,0,0,1);
  --dur:200ms;
}

/* ============ BASE ============ */
html{scroll-behavior:smooth}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3{font-weight:900;letter-spacing:-.02em;line-height:1.05;color:var(--ink)}
h1{font-size:clamp(36px,7vw,104px);line-height:.98}
h2{font-size:clamp(26px,3.4vw,48px);line-height:1.06}
h3{font-size:clamp(19px,2vw,26px);line-height:1.2}
p{max-width:68ch}
strong{font-weight:800}
small{font-size:13px}
hr{border:0;border-top:1px solid var(--line);margin:0}

#main-content{scroll-margin-top:132px}

/* ============ UTILITIES ============ */
.container{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--pad)}
.prose{max-width:68ch;line-height:1.75}
.prose p + p{margin-top:1em}
.stack > * + *{margin-top:var(--gutter)}
.section{position:relative;padding-block:clamp(32px,6vw,80px);border-top:1px solid var(--line)}
.section:first-child{border-top:0}
.section__index{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);transition:color var(--dur) var(--ease)}
[data-section].is-active .section__index{color:var(--flame)}

.grid{display:grid;gap:var(--gutter);grid-template-columns:repeat(12,minmax(0,1fr))}
.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:1 / -1}
@media (min-width:768px){
  .span-4{grid-column:span 4}
  .span-5{grid-column:span 5}
  .span-6{grid-column:span 6}
  .span-7{grid-column:span 7}
  .span-8{grid-column:span 8}
  .span-12{grid-column:1 / -1}
}

.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12px;line-height:1;letter-spacing:.16em;text-transform:uppercase;color:var(--steel-dark)}
.eyebrow::before{content:"";flex:0 0 auto;width:24px;height:1px;background:var(--flame)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 8px;border:1px solid var(--gold);background:var(--sand);color:var(--steel-dark);font-family:var(--font-mono);font-size:11px;line-height:1;letter-spacing:.1em;text-transform:uppercase}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid var(--ink);background:transparent;color:var(--ink);
  font-family:var(--font-sans);font-size:14px;font-weight:700;line-height:1;letter-spacing:.04em;
  text-decoration:none;cursor:pointer;border-radius:0;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn--flame{background:var(--flame);border-color:var(--flame);color:var(--paper)}
.btn--flame:hover{background:var(--ember);border-color:var(--ember)}
.btn--ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper)}
.btn--cut{clip-path:polygon(0 0,calc(100% - 12px) 0,100% 12px,100% 100%,0 100%)}

/* breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding-block:16px;border-bottom:1px solid var(--line);font-family:var(--font-mono);font-size:12px;line-height:1.4;letter-spacing:.08em;color:var(--steel-dark)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb__item + .breadcrumb__item::before{content:"";width:16px;height:1px;background:var(--line)}
.breadcrumb a{text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--flame);border-bottom-color:var(--flame)}

/* figure / media container */
.figure{display:block;background:var(--sand);border:1px solid var(--line)}
.figure__media{
  position:relative;overflow:hidden;aspect-ratio:16 / 9;
  background-color:var(--sand);
  background-image:repeating-linear-gradient(135deg,rgba(11,12,13,.07) 0 1px,transparent 1px 12px);
}
.figure__media img{width:100%;height:100%;object-fit:cover}
.figure--wide .figure__media{aspect-ratio:21 / 9}
.figure__caption{padding:10px 12px;border-top:1px solid var(--line);font-family:var(--font-mono);font-size:12px;line-height:1.6;letter-spacing:.04em;color:var(--steel-dark)}

/* accordion */
.accordion{border-top:1px 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;text-align:left;cursor:pointer;
  font-family:var(--font-sans);font-size:17px;font-weight:800;line-height:1.4;color:var(--ink);
  transition:color var(--dur) var(--ease);
}
.accordion__trigger::after{content:"+";font-family:var(--font-mono);font-size:20px;line-height:1;color:var(--flame)}
.accordion__trigger[aria-expanded="true"]::after{content:"–"}
.accordion__trigger:hover{color:var(--flame)}
.accordion__panel{padding-bottom:18px;font-size:15px;line-height:1.8;color:var(--steel-dark)}

/* ============ SKIP LINK + PROGRESS ============ */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  padding:10px 16px;background:var(--ink);color:var(--paper);
  font-size:13px;font-weight:700;line-height:1;letter-spacing:.04em;text-decoration:none;
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

.progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:120;background:rgba(11,12,13,.08);pointer-events:none}
.progress__bar{display:block;height:100%;width:0;background:var(--flame);transition:width 120ms linear}

/* ============ HEADER : MOBILE FIRST ============ */
.site-header{position:sticky;top:0;z-index:60;background:var(--paper)}

/* rail (移动端折叠为顶部第一层) */
.rail{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:9px 16px;background:var(--ink-green);color:var(--paper);
}
.rail__brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:inherit;min-width:0}
.rail__mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:34px;height:34px;border:1px solid var(--gold);color:var(--gold);
  font-family:var(--font-mono);font-size:14px;font-weight:800;line-height:1;letter-spacing:.04em;
}
.rail__name{display:flex;flex-direction:column;font-size:16px;font-weight:800;line-height:1.15;letter-spacing:-.01em;white-space:nowrap}
.rail__name i{display:none;font-style:normal;font-family:var(--font-mono);font-size:10px;font-weight:400;letter-spacing:.18em;color:var(--gold);margin-top:5px}
.rail__tag{display:none;font-size:13px;line-height:1.6;color:rgba(246,243,237,.72)}
.rail__actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.rail__collect{
  display:inline-flex;align-items:center;gap:6px;padding:8px 10px;
  border:1px solid rgba(214,162,74,.6);color:var(--gold);text-decoration:none;
  font-size:12px;font-weight:700;line-height:1;letter-spacing:.02em;white-space:nowrap;
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.rail__collect::after{content:"★";font-size:11px;line-height:1;color:var(--gold)}
.rail__collect:hover{background:rgba(214,162,74,.14);border-color:var(--gold)}
.rail__lamp{
  display:inline-flex;align-items:center;gap:7px;padding:8px 10px;
  border:1px solid rgba(246,243,237,.24);background:transparent;color:rgba(246,243,237,.8);
  font-family:var(--font-mono);font-size:11px;line-height:1;letter-spacing:.04em;cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail__dot{flex:0 0 auto;width:8px;height:8px;background:var(--line);transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease)}
.rail__lamp[aria-pressed="true"]{border-color:var(--moss);color:var(--paper)}
.rail__lamp[aria-pressed="true"] .rail__dot{background:var(--moss);box-shadow:0 0 0 3px rgba(47,122,92,.3)}
.rail__foot{display:none}

/* head */
.head{position:relative;background:var(--paper)}
.head__meta{display:none}
.head__bar{
  position:relative;display:flex;align-items:center;justify-content:space-between;gap:12px;
  height:56px;padding:0 16px;background:var(--paper);border-bottom:1px solid var(--ink);
}

/* nav toggle */
.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;
  padding:10px 12px;border:1px solid var(--ink);background:transparent;color:var(--ink);
  font-family:var(--font-mono);font-size:11px;font-weight:600;line-height:1;letter-spacing:.14em;text-transform:uppercase;cursor:pointer;
}
.nav-toggle__bar{position:relative;width:18px;height:2px;background:currentColor;transition:background var(--dur) var(--ease)}
.nav-toggle__bar::before,.nav-toggle__bar::after{content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor;transition:transform var(--dur) var(--ease)}
.nav-toggle__bar::before{top:-6px}
.nav-toggle__bar::after{top:6px}
.site-header[data-open] .nav-toggle__bar{background:transparent}
.site-header[data-open] .nav-toggle__bar::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bar::after{transform:translateY(-6px) rotate(-45deg)}

/* nav drawer */
.nav{
  position:absolute;left:0;right:0;top:100%;display:none;
  background:var(--ink-green);border-top:1px solid var(--gold);border-bottom:1px solid var(--ink);
  max-height:calc(100vh - 130px);overflow-y:auto;
}
.site-header[data-open] .nav{display:block}
.nav__list{display:flex;flex-direction:column;align-items:stretch}
.nav__item{display:block;border-bottom:1px solid rgba(246,243,237,.12)}
.nav__item:last-child{border-bottom:0}
.nav__link{
  position:relative;display:block;padding:14px 20px;
  color:var(--paper);text-decoration:none;font-size:16px;font-weight:700;line-height:1.3;letter-spacing:-.01em;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav__link:hover{background:rgba(246,243,237,.07);color:var(--gold)}
.nav__link[aria-current="page"]{color:var(--gold)}
.nav__link[aria-current="page"]::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--flame)}

/* leagues */
.leagues{display:flex;align-items:center;gap:10px;flex:1 1 auto;min-width:0;justify-content:flex-end}
.leagues__label{display:none;flex:0 0 auto;font-family:var(--font-mono);font-size:10px;line-height:1;letter-spacing:.18em;color:var(--steel)}
.leagues__scroll{display:flex;gap:6px;overflow-x:auto;padding:4px 0;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch}
.leagues__scroll::-webkit-scrollbar{height:2px}
.leagues__scroll::-webkit-scrollbar-thumb{background:var(--line)}
.league-chip{
  flex:0 0 auto;padding:6px 10px;border:1px solid var(--line);background:transparent;color:var(--steel-dark);
  font-family:var(--font-mono);font-size:11px;font-weight:500;line-height:1;letter-spacing:.06em;cursor:pointer;
  scroll-snap-align:start;border-radius:0;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.league-chip:hover{border-color:var(--ink);color:var(--ink)}
.league-chip.is-active{border-color:var(--gold);background:var(--sand);color:var(--ink);box-shadow:inset 0 -2px 0 0 var(--gold)}

/* ============ HEADER : DESKTOP ============ */
@media (min-width:1024px){
  body{padding-left:var(--rail-w);padding-top:var(--head-h)}
  #main-content{scroll-margin-top:calc(var(--head-h) + 24px)}

  .site-header{position:static}

  .rail{
    position:fixed;top:0;left:0;bottom:0;z-index:60;
    width:var(--rail-w);
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;gap:18px;
    padding:28px 22px 22px;background:var(--ink-green);color:var(--paper);
    border-right:1px solid var(--ink);overflow-y:auto;
  }
  .rail__brand{gap:12px}
  .rail__mark{width:44px;height:44px;font-size:17px}
  .rail__name{font-size:18px}
  .rail__name i{display:block}
  .rail__tag{display:block;padding-top:16px;border-top:1px solid rgba(246,243,237,.16)}
  .rail__actions{flex-direction:column;align-items:stretch;gap:10px}
  .rail__collect{justify-content:space-between;padding:11px 12px;font-size:13px}
  .rail__lamp{padding:10px 12px;font-size:12px}
  .rail__foot{
    display:flex;flex-direction:column;gap:8px;margin-top:auto;padding-top:16px;
    border-top:1px solid rgba(246,243,237,.16);
    font-family:var(--font-mono);font-size:11px;line-height:1.5;letter-spacing:.08em;color:rgba(246,243,237,.55);
  }
  .rail__icp{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease)}
  .rail__icp:hover{color:var(--gold)}

  .head{position:fixed;top:0;left:var(--rail-w);right:0;z-index:55;background:var(--paper);border-bottom:1px solid var(--ink)}

  .head__meta{
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    height:var(--head-meta-h);padding:0 24px;
    background:var(--sand);border-bottom:1px solid var(--line);
    font-family:var(--font-mono);font-size:11px;line-height:1;letter-spacing:.1em;text-transform:uppercase;color:var(--steel-dark);
  }
  .head__meta-links{display:flex;align-items:center;gap:18px}
  .head__phone,.head__note{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease)}
  .head__phone:hover,.head__note:hover{color:var(--flame)}

  .head__bar{
    height:var(--head-bar-h);padding:0 24px;gap:28px;
    align-items:stretch;justify-content:space-between;
  }
  .nav-toggle{display:none}

  .nav{position:static;display:flex;align-items:center;flex:1 1 auto;min-width:0;overflow:hidden;background:transparent;border:0;max-height:none}
  .nav__list{flex-direction:row;align-items:center;gap:clamp(12px,1.6vw,28px)}
  .nav__item{border:0}
  .nav__link{padding:6px 0;color:var(--ink);font-size:15px;white-space:nowrap}
  .nav__link::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform var(--dur) var(--ease)}
  .nav__link:hover{background:none;color:var(--flame)}
  .nav__link:hover::after{transform:scaleX(1)}
  .nav__link[aria-current="page"]{color:var(--flame)}
  .nav__link[aria-current="page"]::before{display:none}
  .nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--flame)}

  .leagues{flex:0 1 auto;max-width:40%}
  .leagues__label{display:inline-block}
  .league-chip{font-size:12px}
}

/* ============ FOOTER ============ */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--ink-green);color:var(--paper);border-top:1px solid var(--ink);
}
.footer__top{
  display:grid;grid-template-columns:1fr;gap:36px;
  max-width:var(--content-max);margin-inline:auto;
  padding:clamp(32px,5vw,64px) var(--pad) clamp(28px,4vw,56px);
  border-bottom:1px solid rgba(246,243,237,.16);
}
.footer__lead{display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.footer__mark{
  font-family:var(--font-mono);font-size:clamp(44px,6vw,84px);font-weight:800;
  line-height:.9;letter-spacing:-.03em;color:var(--gold);
}
.footer__summary{
  max-width:20ch;font-size:clamp(20px,2.4vw,30px);font-weight:800;line-height:1.2;
  letter-spacing:-.02em;color:var(--paper);
}
.footer__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.footer__col{min-width:0}
.footer__title{
  margin-bottom:14px;font-family:var(--font-mono);font-size:12px;font-weight:600;
  line-height:1;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);
}
.footer__links{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-block;color:rgba(246,243,237,.86);text-decoration:none;font-size:14px;line-height:1.6;
  border-bottom:1px solid transparent;transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer__link:hover{color:var(--paper);border-bottom-color:var(--gold)}
.footer__meta{
  display:flex;flex-direction:column;gap:12px;
  max-width:var(--content-max);margin-inline:auto;
  padding:24px var(--pad) 40px;
}
.footer__contact{max-width:88ch;font-size:13px;line-height:1.85;color:rgba(246,243,237,.78)}
.footer__note{max-width:88ch;font-family:var(--font-mono);font-size:12px;line-height:1.8;letter-spacing:.02em;color:rgba(246,243,237,.6)}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 18px;
  padding-top:16px;border-top:1px solid rgba(246,243,237,.16);
  font-family:var(--font-mono);font-size:11px;line-height:1.6;letter-spacing:.08em;color:rgba(246,243,237,.6);
}
.footer__legal-link{color:inherit;text-decoration:none;transition:color var(--dur) var(--ease)}
.footer__legal-link:hover{color:var(--gold)}

@media (min-width:720px){
  .footer__grid{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media (min-width:900px){
  .footer__top{grid-template-columns:minmax(280px,5fr) 7fr;gap:48px;align-items:start}
}

/* ============ FOCUS & MOTION ============ */
:where(a,button,summary,input,textarea,select,[tabindex]):focus-visible{
  outline:2px solid var(--gold);
  outline-offset:2px;
  box-shadow:0 0 0 4px rgba(14,59,46,.45);
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms!important;
    animation-iteration-count:1!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
  .progress__bar{transition:none}
}