/* ==========================================================================
   必赢亚州游戏 · 赛事档案与场馆索引  /assets/site.css
   语境：赛场夜灯下的档案秩序 · 切角面板 · 刻度与轨迹
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink-green:#0A241E;
  --deep-green:#123D32;
  --moss:#1F5748;
  --gold:#C8A24A;
  --pale-gold:#E7D4A4;
  --cyan:#2FD4C4;
  --warm-gray:#E8E2D6;
  --cream:#F6F0E3;
  --brown-black:#241A14;
  --ember:#CC5A3A;

  --surface:var(--cream);
  --surface-alt:var(--warm-gray);
  --line:rgba(36,26,20,.16);
  --line-strong:rgba(36,26,20,.34);
  --line-light:rgba(232,226,214,.2);

  --font-display:"Archivo","Noto Sans SC","PingFang SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",SFMono-Regular,ui-monospace,monospace;

  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --header-h:78px;
  --cut:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
::selection{background:var(--gold);color:var(--ink-green)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 3. 中文排版基座 ---------- */
body{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  background:var(--surface);
  color:var(--brown-black);
  font-family:var(--font-body);
  font-size:clamp(15.5px,.55vw + 14px,17.5px);
  font-weight:400;
  line-height:1.78;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body > main{flex:1 0 auto}
h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:700;line-height:1.16;letter-spacing:-.018em;color:var(--brown-black);text-wrap:balance}
h1{font-size:clamp(2rem,4.2vw,3.4rem)}
h2{font-size:clamp(1.5rem,2.5vw,2.15rem)}
h3{font-size:clamp(1.15rem,1.5vw,1.4rem);letter-spacing:-.012em}
h4{font-size:1rem;letter-spacing:0}
p + p{margin-top:.9em}
strong,b{font-weight:700}
small{font-size:.82em}
code,kbd,samp{font-family:var(--font-mono);font-size:.9em}

/* ---------- 4. 通用容器与节奏 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(26px,3.5vw,44px)}
.rule{height:1px;background:var(--line);border:0;margin:0}
.rule--gold{height:2px;background:linear-gradient(90deg,var(--gold),rgba(200,162,74,0))}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.display-num{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em;font-variant-numeric:tabular-nums;line-height:1}

/* ---------- 5. 按钮与标签 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-display);font-weight:700;font-size:.9rem;
  letter-spacing:-.005em;line-height:1.2;text-align:center;
  padding:.72em 1.15em;border:1px solid transparent;border-radius:2px;
  cursor:pointer;background:transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--gold{
  background:linear-gradient(180deg,#D8B662,#C8A24A);
  color:var(--ink-green);
  border-color:var(--pale-gold);
  box-shadow:inset 0 -2px 0 rgba(10,36,30,.18);
}
.btn--gold:hover,.btn--gold:focus-visible{background:var(--pale-gold);color:var(--ink-green);border-color:var(--gold)}
.btn--ghost{background:transparent;color:var(--pale-gold);border-color:rgba(200,162,74,.55)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan);background:rgba(47,212,196,.08)}
.btn--sm{font-size:.78rem;padding:.5em .85em;letter-spacing:.01em}
.btn__arrow{transition:transform .2s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(3px)}
.kicker{
  display:inline-flex;align-items:center;gap:.6em;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.16em;
  color:var(--moss);text-transform:none;
}
.kicker::before{content:"";width:18px;height:2px;background:var(--gold);flex:0 0 auto}
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
  padding:.26em .6em;border-radius:2px;
  color:var(--moss);background:rgba(31,87,72,.07);border:1px solid rgba(31,87,72,.26);
}
.tag--gold{color:#7A5E1C;background:rgba(200,162,74,.15);border-color:rgba(200,162,74,.5)}
.tag--cyan{color:#0E6B62;background:rgba(47,212,196,.12);border-color:rgba(47,212,196,.5)}
.tag--ember{color:#8E3A24;background:rgba(204,90,58,.1);border-color:rgba(204,90,58,.45)}
.chip{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
  padding:.42em .8em;border-radius:2px;cursor:pointer;
  background:transparent;border:1px solid var(--line-strong);color:var(--brown-black);
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);
}
.chip:hover{border-color:var(--gold);color:var(--deep-green);background:rgba(200,162,74,.12)}
.chip[aria-pressed="true"]{border-color:var(--gold);color:var(--deep-green);background:rgba(200,162,74,.18);box-shadow:inset 0 -2px 0 var(--gold)}

/* ---------- 6. Skip link ---------- */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:200;
  display:inline-block;padding:.6em 1em;border-radius:2px;
  background:var(--gold);color:var(--ink-green);
  font-family:var(--font-display);font-weight:700;font-size:.85rem;
  border:1px solid var(--pale-gold);
  transition:top .22s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 7. 页头 ---------- */
.masthead{
  position:sticky;top:0;z-index:60;
  background:var(--ink-green);
  color:var(--warm-gray);
  border-bottom:1px solid rgba(200,162,74,.36);
  box-shadow:0 10px 24px -22px rgba(10,36,30,.9);
}
.masthead__rail{
  height:3px;
  background:repeating-linear-gradient(90deg,var(--gold) 0 2px,rgba(200,162,74,0) 2px 14px);
  opacity:.6;
}
.masthead__inner{
  max-width:var(--shell);margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  transition:min-height .26s var(--ease);
}
.masthead[data-condensed] .masthead__inner{min-height:60px}

/* 品牌 */
.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--cream)}
.brand__mark{
  position:relative;flex:0 0 auto;
  width:34px;height:34px;
  background:linear-gradient(150deg,var(--moss),var(--ink-green));
  border:1px solid rgba(200,162,74,.72);
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
}
.brand__mark::before{
  content:"";position:absolute;inset:8px;
  background:repeating-linear-gradient(135deg,var(--gold) 0 2px,rgba(200,162,74,0) 2px 6px);
  opacity:.9;
}
.brand__mark::after{
  content:"";position:absolute;right:4px;bottom:4px;
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand__name{font-family:var(--font-display);font-weight:700;font-size:1.02rem;letter-spacing:-.01em;color:var(--cream);white-space:nowrap}
.brand__line{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.06em;color:rgba(231,212,164,.72);margin-top:4px;white-space:nowrap}
.masthead[data-condensed] .brand__line{display:none}

/* 主导航 */
.nav{margin-left:auto;min-width:0}
.nav__list{display:flex;align-items:center;gap:clamp(2px,.9vw,16px)}
.nav__item{flex:0 0 auto}
.nav__link{
  position:relative;display:inline-block;
  padding:.45em .28em;
  font-size:.9rem;font-weight:500;color:rgba(232,226,214,.84);
  transition:color .18s var(--ease);
  white-space:nowrap;
}
.nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav__link:hover{color:var(--pale-gold)}
.nav__link:hover::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--gold);font-weight:700}
.nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}
.nav__aside{display:none}

/* 工具区 */
.masthead__tools{display:flex;align-items:center;gap:clamp(8px,1.2vw,16px);flex:0 0 auto}
.tools-link{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;
  color:rgba(231,212,164,.78);
  border-bottom:1px dashed rgba(200,162,74,.45);
  padding-bottom:2px;white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.tools-link:hover,.tools-link:focus-visible{color:var(--cyan);border-color:var(--cyan)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:.45em .6em;border-radius:2px;cursor:pointer;
  background:rgba(47,212,196,.06);
  border:1px solid rgba(200,162,74,.5);
  color:var(--pale-gold);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__box{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bar{display:block;height:2px;background:currentColor;transition:transform .22s var(--ease),opacity .18s var(--ease)}
.nav-toggle__label{line-height:1}
.masthead[data-open] .nav-toggle{color:var(--cyan);border-color:var(--cyan);background:rgba(47,212,196,.14)}
.masthead[data-open] .nav-toggle__bar:nth-child(1){transform:translateY(5px) rotate(45deg)}
.masthead[data-open] .nav-toggle__bar:nth-child(2){opacity:0}
.masthead[data-open] .nav-toggle__bar:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* 赛程刻度轴 */
.masthead__axis{
  border-top:1px solid rgba(232,226,214,.12);
  background:linear-gradient(90deg,rgba(18,61,50,.92),rgba(10,36,30,.96));
}
.axis__inner{
  max-width:var(--shell);margin-inline:auto;
  padding:7px var(--gutter);
  display:flex;align-items:center;gap:clamp(10px,1.6vw,20px);
}
.axis__title{
  flex:0 0 auto;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;
  color:rgba(47,212,196,.88);white-space:nowrap;
}
.axis__list{
  flex:1 1 auto;min-width:0;
  display:flex;align-items:center;
  max-height:26px;overflow:hidden;overflow-x:auto;
  scrollbar-width:none;
  transition:max-height .26s var(--ease),opacity .2s var(--ease);
}
.axis__list::-webkit-scrollbar{display:none}
.masthead[data-condensed] .axis__list{max-height:0;opacity:0}
.axis__item{
  position:relative;flex:0 0 auto;
  display:flex;align-items:center;gap:7px;
  padding-right:22px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.04em;
  color:rgba(232,226,214,.6);white-space:nowrap;
}
.axis__item::before{
  content:"";flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  border:1px solid rgba(200,162,74,.66);background:transparent;
}
.axis__item::after{
  content:"";position:absolute;right:6px;top:50%;
  width:12px;height:1px;background:rgba(232,226,214,.28);
}
.axis__item:last-child::after{display:none}
.axis__item--now{color:var(--pale-gold)}
.axis__item--now::before{background:var(--gold);box-shadow:0 0 0 3px rgba(200,162,74,.18)}
.axis__num{color:rgba(200,162,74,.85)}
.axis__item--now .axis__num{color:var(--cyan)}
.axis__label{letter-spacing:.06em}
.axis__more{
  flex:0 0 auto;margin-left:auto;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.08em;
  color:var(--cyan);border-bottom:1px solid rgba(47,212,196,.4);
  padding-bottom:1px;white-space:nowrap;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.axis__more:hover,.axis__more:focus-visible{color:var(--pale-gold);border-color:var(--gold)}

/* ---------- 8. 页脚 ---------- */
.foot{
  position:relative;
  background:var(--ink-green);
  color:rgba(232,226,214,.78);
  border-top:3px solid var(--gold);
  margin-top:clamp(48px,7vw,96px);
}
.foot::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(200,162,74,.07) 0 1px,rgba(200,162,74,0) 1px 24px);
}
.foot__inner{
  position:relative;max-width:var(--shell);margin-inline:auto;
  padding:clamp(42px,6vw,78px) var(--gutter) clamp(20px,3vw,30px);
  display:grid;
  grid-template-columns:minmax(220px,.85fr) minmax(0,2fr);
  gap:clamp(28px,4vw,56px);
}
.foot__brand{display:flex;flex-direction:column;gap:16px}
.brand--foot{color:var(--cream)}
.brand--foot .brand__name{font-size:1.08rem}
.brand--foot .brand__line{color:rgba(47,212,196,.72);letter-spacing:.12em}
.foot__note{font-size:.86rem;line-height:1.75;color:rgba(232,226,214,.62);max-width:30ch}
.foot__main{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);
  gap:clamp(24px,3vw,40px);
}
.foot__cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,2.6vw,30px)}
.foot__col-title{
  font-family:var(--font-mono);font-weight:500;font-size:.7rem;letter-spacing:.16em;
  color:var(--gold);margin-bottom:14px;padding-bottom:8px;
  border-bottom:1px solid rgba(200,162,74,.28);
}
.foot__list{display:block}
.foot__list li{
  display:grid;grid-template-columns:52px minmax(0,1fr);gap:10px;align-items:baseline;
  padding:7px 0;border-bottom:1px dashed rgba(232,226,214,.14);
}
.foot__col .foot__list li{display:block;padding:0;border:0}
.foot__col .foot__list li + li{margin-top:2px}
.foot__col .foot__list a{
  display:inline-block;padding:6px 0;font-size:.9rem;
  color:rgba(232,226,214,.84);
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.foot__col .foot__list a:hover,.foot__col .foot__list a:focus-visible{color:var(--cyan);border-color:rgba(47,212,196,.5)}
.foot__key{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;color:rgba(200,162,74,.85)}
.foot__val{font-size:.86rem;line-height:1.65;color:rgba(232,226,214,.9);word-break:break-word}
.foot__contact .foot__hint{font-size:.78rem;line-height:1.7;color:rgba(232,226,214,.55);margin-top:14px;max-width:34ch}
.foot__contact .btn{margin-top:16px}
.foot__base{
  grid-column:1 / -1;
  display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:space-between;align-items:baseline;
  padding-top:18px;border-top:1px solid var(--line-light);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.05em;
  color:rgba(232,226,214,.52);
}
.foot__legal,.foot__copy{margin:0}

/* ---------- 9. 页面容器、面包屑、网格 ---------- */
.crumbs{margin-block:clamp(16px,2.4vw,26px)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.05em;color:rgba(36,26,20,.55)}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:rgba(36,26,20,.28)}
.crumbs a{color:var(--moss);border-bottom:1px solid rgba(31,87,72,.32);transition:color .18s,border-color .18s}
.crumbs a:hover,.crumbs a:focus-visible{color:var(--brown-black);border-color:var(--gold)}
.crumbs [aria-current="page"]{color:rgba(36,26,20,.5)}

.grid{display:grid;gap:clamp(16px,2vw,24px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,3fr) minmax(0,9fr)}
.grid--bento{grid-template-columns:repeat(12,minmax(0,1fr));grid-auto-rows:minmax(110px,auto)}

/* ---------- 10. 面板、标签、列表 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,2.2vw,28px);
  background:var(--surface-alt);
  border:1px solid var(--line);
  border-radius:2px;
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.panel:hover{border-color:var(--gold)}
.panel--ink{background:var(--deep-green);color:var(--warm-gray);border-color:rgba(200,162,74,.3)}
.panel--ink h2,.panel--ink h3,.panel--ink h4{color:var(--cream)}
.panel--gold{background:#EFE6CE;border-color:rgba(200,162,74,.55);box-shadow:inset 0 0 0 1px rgba(200,162,74,.18)}

/* ---------- 11. 图片容器基础 ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 10;
  background:linear-gradient(155deg,var(--moss),var(--ink-green));
  border:1px solid rgba(200,162,74,.3);
  clip-path:polygon(0 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%);
}
.media__img{width:100%;height:100%;object-fit:cover;display:block}
.media__grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(231,212,164,.16) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(231,212,164,.16) 1px,transparent 1px);
  background-size:44px 44px;
  mix-blend-mode:screen;
}
.media__cap{
  position:absolute;left:10px;bottom:9px;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.08em;
  color:var(--pale-gold);background:rgba(10,36,30,.76);
  padding:.22em .55em;border-left:2px solid var(--gold);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:3 / 4}
.media--square{aspect-ratio:1 / 1}

/* ---------- 12. 章节索引 ---------- */
.toc{
  position:sticky;top:calc(var(--header-h) + 20px);
  padding-left:2px;
}
.toc__title{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;
  color:var(--moss);margin-bottom:12px;
}
.toc__link{
  display:block;padding:.4em 0 .4em 14px;
  font-size:.86rem;line-height:1.5;
  color:rgba(36,26,20,.62);
  border-left:2px solid var(--line);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.toc__link:hover{color:var(--brown-black);border-color:var(--gold)}
.toc__link[data-active],
.toc__link[aria-current="true"]{
  color:var(--brown-black);font-weight:700;
  border-color:var(--gold);
  background:linear-gradient(90deg,rgba(200,162,74,.14),transparent);
}

/* ---------- 13. 长文排版 ---------- */
.prose{max-width:74ch}
.prose > * + *{margin-top:1.05em}
.prose p{max-width:66ch}
.prose h2{margin-top:2.1em}
.prose h3{margin-top:1.6em}
.prose ul,.prose ol{display:block}
.prose li{position:relative;padding-left:1.15em}
.prose li + li{margin-top:.45em}
.prose ul li::before{content:"";position:absolute;left:0;top:.78em;width:7px;height:1px;background:var(--gold)}
.prose ol{counter-reset:prose}
.prose ol li::before{
  counter-increment:prose;content:counter(prose,decimal-leading-zero);
  font-family:var(--font-mono);font-size:.7rem;color:var(--gold);
  top:.5em;width:auto;
}
.prose a{color:var(--moss);border-bottom:1px solid rgba(31,87,72,.35)}
.prose a:hover,.prose a:focus-visible{color:var(--deep-green);border-color:var(--cyan)}

/* ---------- 14. 滚动进度与返回顶部（JS 生成） ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;z-index:120;
  width:100%;height:3px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--cyan));
  pointer-events:none;
}
.to-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:clamp(12px,3vw,28px);z-index:90;
  width:46px;height:46px;display:inline-flex;align-items:center;justify-content:center;
  font-family:var(--font-mono);font-size:1rem;line-height:1;
  background:var(--deep-green);color:var(--pale-gold);
  border:1px solid var(--gold);border-radius:2px;cursor:pointer;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s,background .2s,color .2s;
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover,.to-top:focus-visible{background:var(--ink-green);color:var(--cyan);border-color:var(--cyan)}

/* ---------- 15. 入场显现 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .42s var(--ease),transform .42s var(--ease)}
.js [data-reveal][data-revealed]{opacity:1;transform:none}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1080px){
  .nav__list{gap:4px}
  .nav__link{font-size:.85rem;padding:.45em .2em}
  .brand__line{letter-spacing:.04em}
}

@media (max-width:980px){
  :root{--header-h:64px}
  .nav-toggle{display:inline-flex}
  .tools-link{display:none}
  .masthead__inner{justify-content:space-between;gap:12px}
  .masthead__tools{margin-left:auto}

  .nav{
    position:absolute;left:0;right:0;top:100%;margin:0;
    max-height:0;overflow:hidden;
    background:var(--deep-green);
    border-bottom:1px solid rgba(200,162,74,.36);
    transition:max-height .3s var(--ease);
  }
  .masthead[data-open] .nav{max-height:min(72vh,560px);overflow-y:auto}
  .nav__list{flex-direction:column;align-items:stretch;gap:0;padding:6px var(--gutter) 4px}
  .nav__item{border-bottom:1px solid rgba(232,226,214,.1)}
  .nav__link{display:block;padding:.85em 0;font-size:.95rem}
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{
    color:var(--gold);
    background:linear-gradient(90deg,rgba(200,162,74,.16),transparent);
    padding-left:10px;
  }
  .nav__aside{display:flex;flex-wrap:wrap;gap:10px 20px;padding:14px var(--gutter) 20px}
  .nav__aside-link{
    font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;
    color:rgba(47,212,196,.86);border-bottom:1px dashed rgba(47,212,196,.45);padding-bottom:2px;
  }
  .nav__aside-link:hover{color:var(--pale-gold);border-color:var(--gold)}

  .foot__inner{grid-template-columns:minmax(0,1fr)}
  .foot__main{grid-template-columns:minmax(0,1fr)}
  .foot__note{max-width:none}
  .grid--split,.grid--3{grid-template-columns:minmax(0,1fr)}
  .toc{position:static;top:auto}
}

@media (max-width:720px){
  .foot__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--2,.grid--bento{grid-template-columns:minmax(0,1fr)}
  .axis__title{display:none}
}

@media (max-width:640px){
  .brand__line{display:none}
  .brand__mark{width:30px;height:30px}
  .brand__name{font-size:.96rem}
  .btn--sm{font-size:.74rem}
  .foot__cols{grid-template-columns:minmax(0,1fr)}
  .foot__base{flex-direction:column;align-items:flex-start}
  .axis__inner{gap:12px}
  .media--wide{aspect-ratio:16 / 10}
}

/* ---------- 17. 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;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .to-top{transform:none}
}