/* ============================================================
   乐竞主站 · 共享样式 / assets/site.css
   ============================================================ */
:root{
  --ink-deep:#0B2B24;
  --ink-night:#061913;
  --ink-mid:#145145;
  --mist:#F4F6F5;
  --silver:#C7CFCC;
  --silver-dim:#8FA8A1;
  --cyan:#29F0D2;
  --amber:#FFA62B;
  --amber-deep:#B96B00;
  --graphite:#2A3331;

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

  --container:1200px;
  --gut:clamp(16px,4vw,40px);
  --gap:clamp(16px,2.4vw,28px);
  --dur:160ms;
  --ease:cubic-bezier(.2,.75,.3,1);
  --hair:rgba(199,207,204,.22);
  --hair-dark:rgba(199,207,204,.14);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--mist);
  color:var(--graphite);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.78;
  font-weight:400;
}
h1,h2,h3,h4{margin:0;font-family:var(--font-title);font-weight:900;letter-spacing:-.02em;line-height:1.2;color:var(--graphite)}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0 0 0 1.2em}
img{max-width:100%;display:block}
a{color:inherit}
::selection{background:var(--cyan);color:var(--ink-night)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 基础容器 ---------- */
.container{width:min(calc(100% - 2 * var(--gut)),var(--container));margin-inline:auto}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:80;
  display:inline-block;
  background:var(--cyan);color:var(--ink-night);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  padding:10px 16px;text-decoration:none;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:10px}

/* ---------- 阅读进度 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;height:2px;width:0;z-index:70;
  background:var(--cyan);pointer-events:none;
}

/* ============================================================
   页头
   ============================================================ */
.site-header{position:relative;background:var(--ink-deep);color:var(--mist)}
.site-header::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(to right,rgba(199,207,204,.07) 1px,transparent 1px);
  background-size:80px 100%;
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,.85),transparent);
  mask-image:linear-gradient(to bottom,rgba(0,0,0,.85),transparent);
}
.header-inner{position:relative;z-index:1;padding-top:24px}

.masthead{
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:end;gap:16px;
  padding-bottom:18px;
}
.masthead__coord{
  justify-self:start;margin:0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--silver-dim);
}
.masthead__coord::before{
  content:"";display:inline-block;width:22px;height:1px;
  background:var(--cyan);vertical-align:middle;margin-right:10px;
}
.masthead__brand{justify-self:center;text-align:center}
.brand{
  display:inline-flex;flex-direction:column;align-items:center;gap:7px;
  text-decoration:none;
}
.brand__name{
  font-family:var(--font-title);font-weight:900;
  font-size:clamp(28px,4vw,44px);line-height:1;letter-spacing:-.02em;
  color:var(--mist);
  transition:color var(--dur) var(--ease);
}
.brand:hover .brand__name{color:var(--cyan)}
.brand__tagline{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  color:var(--cyan);
}

.masthead__index{justify-self:end;display:flex;align-items:center;gap:18px;font-family:var(--font-mono)}
.index__cell{display:inline-flex;flex-direction:column;align-items:flex-end;line-height:1.25}
.index__cell + .index__cell{border-left:1px solid var(--hair);padding-left:18px}
.index__key{font-size:11px;letter-spacing:.18em;color:var(--silver-dim)}
.index__val{font-size:13px;letter-spacing:.06em;color:var(--mist)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:transparent;color:var(--mist);
  border:1px solid rgba(199,207,204,.35);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  padding:8px 12px;cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:currentColor}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__text{white-space:nowrap}

.site-nav{border-top:1px solid var(--hair)}
.site-nav__list{
  display:flex;flex-wrap:wrap;justify-content:center;
  gap:clamp(12px,3vw,40px);
  list-style:none;padding:0;margin:0;
}
.site-nav__link{
  position:relative;display:inline-block;
  padding:16px 2px;font-size:15px;letter-spacing:.02em;
  color:var(--silver);text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:9px;width:0;height:2px;
  background:var(--cyan);
  transition:width 180ms var(--ease);
}
.site-nav__link:hover{color:var(--mist)}
.site-nav__link:hover::after{width:100%}
.site-nav__link[aria-current="page"]{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{width:100%}

.header-strip{position:relative;z-index:1;background:var(--ink-night);border-top:1px solid var(--hair-dark)}
.header-strip__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:9px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
}
.header-strip__note{color:var(--silver-dim)}
.header-strip__links{display:flex;align-items:center;gap:10px}
.util-link{
  display:inline-block;padding:4px 10px;text-decoration:none;
  letter-spacing:.08em;border:1px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.util-link--cyan{color:var(--cyan);border-color:rgba(41,240,210,.45)}
.util-link--cyan:hover{background:var(--cyan);color:var(--ink-night);border-color:var(--cyan)}
.util-link--amber{color:var(--amber);border-color:rgba(255,166,43,.45)}
.util-link--amber:hover{background:var(--amber);color:var(--ink-night);border-color:var(--amber)}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{background:var(--ink-night);color:var(--silver);font-size:15px;position:relative}
.footer-scale{
  height:8px;
  background-image:repeating-linear-gradient(to right,rgba(41,240,210,.6) 0 2px,transparent 2px 24px);
  background-position:0 0;
}
.footer-top{background:var(--ink-deep)}
.footer-inner{padding:48px 0 40px}
.footer-top .footer-inner{
  display:grid;grid-template-columns:minmax(200px,1fr) 2.2fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand__name{
  display:block;font-family:var(--font-title);font-weight:900;
  font-size:28px;line-height:1.1;letter-spacing:-.02em;color:var(--mist);
}
.footer-brand__line{
  display:block;margin-top:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--cyan);
}
.footer-brand__coord{
  margin:18px 0 0;padding-top:14px;border-top:1px solid var(--hair-dark);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--silver-dim);
}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(140px,1fr));gap:clamp(20px,3vw,40px)}
.footer-col__title{
  margin:0 0 14px;padding-bottom:10px;border-bottom:1px solid var(--hair-dark);
  font-family:var(--font-mono);font-size:13px;font-weight:400;letter-spacing:.16em;
  color:var(--silver-dim);
}
.footer-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-list__link{
  position:relative;display:inline-block;
  color:var(--silver);text-decoration:none;
  transition:color var(--dur) var(--ease);
}
.footer-list__link::after{
  content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;
  background:var(--cyan);
  transition:width var(--dur) var(--ease);
}
.footer-list__link:hover{color:var(--cyan)}
.footer-list__link:hover::after{width:100%}
.footer-list__link--amber{color:var(--amber)}
.footer-list__link--amber:hover{color:var(--amber)}
.footer-list__link--amber::after{background:var(--amber)}

.footer-contact{
  grid-column:1 / -1;margin-top:36px;padding-top:24px;
  border-top:1px solid var(--hair-dark);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:18px 32px;
}
.footer-contact__item{margin:0}
.footer-contact__key{
  display:block;margin-bottom:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--silver-dim);
}
.footer-contact__val{color:var(--mist);word-break:break-word}
.footer-contact__note{
  grid-column:1 / -1;margin:0;max-width:70ch;
  font-size:13px;line-height:1.7;color:var(--silver-dim);
}
.footer-bottom{background:var(--ink-night);border-top:1px solid var(--hair-dark)}
.footer-bottom__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 20px;padding:18px 0 26px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--silver-dim);
}
.footer-meta{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px}
.footer-legal__sep{display:inline-block;width:1px;height:10px;background:rgba(199,207,204,.3)}

.to-top{
  position:fixed;right:20px;bottom:20px;z-index:60;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;cursor:pointer;
  background:var(--ink-deep);color:var(--cyan);
  border:1px solid rgba(41,240,210,.45);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity var(--dur) var(--ease),visibility var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease);
}
.to-top.is-on{opacity:1;visibility:visible;pointer-events:auto}
.to-top:hover{background:var(--cyan);color:var(--ink-night)}

/* ============================================================
   通用组件
   ============================================================ */
.band{padding:clamp(48px,7vw,96px) 0}
.band--mist{background:var(--mist);color:var(--graphite)}
.band--deep{background:var(--ink-deep);color:var(--mist)}
.band--night{background:var(--ink-night);color:var(--mist)}
.band--mid{background:var(--ink-mid);color:var(--mist)}
.band--deep h1,.band--deep h2,.band--deep h3,
.band--night h1,.band--night h2,.band--night h3,
.band--mid h1,.band--mid h2,.band--mid h3{color:var(--mist)}

.grid{display:grid;gap:var(--gap)}
.grid--12{grid-template-columns:repeat(12,1fr)}
.col-2{grid-column:span 2}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:16px;
  margin-bottom:clamp(20px,3vw,34px);padding-bottom:12px;
  border-bottom:2px solid var(--graphite);
}
.band--deep .section-head,.band--night .section-head,.band--mid .section-head{border-bottom-color:var(--cyan)}
.section-head__title{font-size:clamp(22px,3vw,34px)}
.section-head__note{
  margin-left:auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--silver-dim);
}

.prose{max-width:66ch}
.prose p{font-size:17px;line-height:1.78}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin:1.8em 0 .6em}
.prose h3{font-size:19px;margin:1.6em 0 .5em}
.prose a{color:var(--amber-deep);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--graphite)}
.band--deep .prose a,.band--night .prose a,.band--mid .prose a{color:var(--cyan)}
.band--deep .prose a:hover,.band--night .prose a:hover,.band--mid .prose a:hover{color:var(--mist)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;text-decoration:none;cursor:pointer;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.12em;
  border:1px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn::before{
  content:"";display:block;width:8px;height:8px;background:currentColor;
  transition:transform var(--dur) var(--ease);
}
.btn:hover::before{transform:translateX(3px)}
.btn--cyan{background:var(--cyan);color:var(--ink-night)}
.btn--cyan:hover{background:var(--mist)}
.btn--amber{background:var(--amber);color:var(--ink-night)}
.btn--amber:hover{background:var(--mist)}
.btn--ghost{background:transparent;border-color:var(--silver);color:var(--graphite)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--ink-mid)}
.band--deep .btn--ghost,.band--night .btn--ghost,.band--mid .btn--ghost{color:var(--mist);border-color:rgba(199,207,204,.45)}
.band--deep .btn--ghost:hover,.band--night .btn--ghost:hover,.band--mid .btn--ghost:hover{color:var(--cyan);border-color:var(--cyan)}

.panel{
  background:var(--mist);color:var(--graphite);
  border:1px solid var(--silver);
  padding:clamp(20px,3vw,32px);
}
.panel--cut{
  position:relative;border:none;padding:clamp(22px,3vw,34px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
  transition:transform var(--dur) var(--ease);
}
.panel--cut:hover{transform:translate(2px,-2px)}
.panel--ink{background:var(--ink-deep);color:var(--mist);border-color:transparent}
.panel--mid{background:var(--ink-mid);color:var(--mist);border-color:transparent}
.panel__kicker{
  display:block;margin-bottom:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--silver-dim);
}
.panel--ink .panel__kicker,.panel--mid .panel__kicker{color:var(--cyan)}

.tag{
  display:inline-block;padding:3px 9px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  border:1px solid var(--silver);color:var(--graphite);
}
.tag--cyan{color:var(--ink-mid);border-color:var(--cyan);background:rgba(41,240,210,.16)}
.tag--amber{color:var(--amber-deep);border-color:var(--amber);background:rgba(255,166,43,.16)}
.band--deep .tag,.band--night .tag,.band--mid .tag{border-color:rgba(199,207,204,.4);color:var(--silver)}
.band--deep .tag--cyan,.band--night .tag--cyan,.band--mid .tag--cyan{color:var(--cyan);border-color:var(--cyan);background:rgba(41,240,210,.1)}
.band--deep .tag--amber,.band--night .tag--amber,.band--mid .tag--amber{color:var(--amber);border-color:var(--amber);background:rgba(255,166,43,.1)}

.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:14px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--silver-dim);
}
.crumbs a{color:inherit;text-decoration:none}
.crumbs a:hover{color:var(--cyan)}
.crumbs__sep{color:var(--silver)}
.crumbs [aria-current="page"]{color:var(--graphite)}
.band--deep .crumbs,.band--night .crumbs,.band--mid .crumbs{color:var(--silver-dim)}
.band--deep .crumbs [aria-current="page"],.band--night .crumbs [aria-current="page"],.band--mid .crumbs [aria-current="page"]{color:var(--mist)}

.entry-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--silver)}
.entry{
  display:grid;grid-template-columns:64px 1fr auto;
  gap:8px 18px;align-items:baseline;
  padding:18px 0;border-bottom:1px solid var(--silver);
}
.entry__index{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--silver-dim)}
.entry__title{font-family:var(--font-title);font-weight:900;font-size:19px;letter-spacing:-.01em;line-height:1.4}
.entry__title a{text-decoration:none}
.entry__title a:hover{color:var(--ink-mid)}
.entry__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--silver-dim)}
.band--deep .entry-list,.band--night .entry-list,.band--mid .entry-list,
.band--deep .entry,.band--night .entry,.band--mid .entry{border-color:rgba(199,207,204,.2)}
.band--deep .entry__title a:hover,.band--night .entry__title a:hover,.band--mid .entry__title a:hover{color:var(--cyan)}

.rail{
  position:sticky;top:24px;
  display:flex;flex-direction:column;gap:2px;
  font-family:var(--font-mono);
}
.rail__item{
  display:block;padding:8px 10px;
  font-size:12px;letter-spacing:.08em;text-decoration:none;
  color:var(--silver-dim);
  border-left:2px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.rail__item:hover{color:var(--mist);background:rgba(41,240,210,.08)}
.rail__item.is-active,.rail__item[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan)}
.rail--light .rail__item{color:var(--graphite)}
.rail--light .rail__item:hover{color:var(--ink-mid);background:rgba(41,240,210,.14)}
.rail--light .rail__item.is-active{color:var(--ink-mid);border-left-color:var(--cyan)}

.figure-frame{
  position:relative;overflow:hidden;
  background:var(--ink-mid);
}
.figure-frame img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.55) contrast(1.05);
  transition:filter 220ms var(--ease),transform 220ms var(--ease);
}
.figure-frame:hover img{filter:saturate(.85) contrast(1.05);transform:scale(1.02)}
.figure-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,25,19,0) 42%,rgba(6,25,19,.6));
}
.figure-frame--ratio{aspect-ratio:16 / 9}
.figure-frame--tall{aspect-ratio:3 / 4}
.figure-frame--bleed{margin-inline:calc(-1 * var(--gut))}
.figure-frame__caption{
  position:absolute;left:0;bottom:0;z-index:1;
  padding:12px 14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist);
}

[data-reveal]{
  opacity:0;transform:translateY(10px);
  transition:opacity 260ms var(--ease),transform 260ms var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .masthead__coord{font-size:11px;letter-spacing:.1em}
  .masthead__coord::before{width:14px}
}
@media (max-width:900px){
  .masthead{grid-template-columns:1fr auto;align-items:center;gap:12px;padding-bottom:14px}
  .masthead__coord{display:none}
  .masthead__brand{justify-self:start;text-align:left}
  .brand{align-items:flex-start;gap:5px}
  .masthead__index{gap:12px}
  .index__cell{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{display:none}
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;flex-wrap:nowrap;gap:0;padding:6px 0 12px}
  .site-nav__list > li{width:100%}
  .site-nav__link{display:block;padding:13px 0 13px 14px;border-bottom:1px solid var(--hair-dark)}
  .site-nav__link::after{display:none}
  .site-nav__link[aria-current="page"]{box-shadow:inset 3px 0 0 var(--cyan)}

  .header-strip__inner{flex-direction:column;align-items:flex-start;gap:8px;padding:10px 0}
  .header-strip__links{flex-wrap:wrap}

  .footer-top .footer-inner{grid-template-columns:1fr;gap:32px;padding:40px 0 32px}
  .footer-brand,.footer-grid{grid-column:auto}
  .footer-contact{margin-top:0}

  .grid--12{grid-template-columns:repeat(6,1fr)}
  .col-2,.col-3,.col-4,.col-5,.col-6{grid-column:span 6}
  .col-7,.col-8,.col-12{grid-column:1 / -1}

  .entry{grid-template-columns:56px 1fr;row-gap:4px}
  .entry__meta{grid-column:2}
  .rail{position:static;flex-direction:row;flex-wrap:wrap}
  .rail__item{border-left:none;border-bottom:2px solid transparent}
  .rail__item.is-active{border-left:none;border-bottom-color:var(--cyan)}
}
@media (max-width:640px){
  body{font-size:16px}
  .brand__name{font-size:26px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-bottom__inner{flex-direction:column;align-items:flex-start}
  .footer-legal{gap:6px 12px}
  .figure-frame--bleed{margin-inline:calc(-1 * var(--gut))}
  .to-top{right:12px;bottom:12px;padding:9px 12px}
}
@media (max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .btn{width:100%;justify-content:center}
}

/* ============================================================
   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-reveal]{opacity:1;transform:none}
  .panel--cut:hover{transform:none}
  .figure-frame:hover img{transform:none}
}