/* ==========================================================================
   老虎游戏机玩 · 共享样式 /assets/site.css
   午夜游戏厅 × 复古街机海报 × 展览画册节奏
   ========================================================================== */

/* ---------- 0. 设计变量 ---------- */
:root{
  --gold:#F5A524;
  --gold-bright:#FFC94A;
  --copper:#C2571A;
  --green:#0F2E26;
  --green-deep:#071A15;
  --black:#0B0F0E;
  --cyan:#3DE0D0;
  --bone:#F4EFE4;
  --moss:#7E9A8F;
  --glass:rgba(244,239,228,.06);
  --line:rgba(244,239,228,.14);
  --line-gold:rgba(245,165,36,.38);
  --line-cyan:rgba(61,224,208,.32);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","DejaVu Sans Mono",Consolas,"Liberation Mono","Courier New",monospace;

  --rail-w:15.5rem;
  --status-h:2.75rem;
  --topbar-h:3.5rem;
  --pad-x:clamp(1.25rem,4vw,3.5rem);
  --maxw:80rem;
  --radius:3px;
  --shadow-lg:0 26px 60px -28px rgba(0,0,0,.9);
  --ease:cubic-bezier(.22,.8,.28,1);
}

/* ---------- 1. RESET ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
hr{border:0;border-top:1px solid var(--line);margin:2rem 0}

/* ---------- 2. 基础版式 ---------- */
body{
  min-height:100vh;
  background-color:var(--black);
  color:var(--bone);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.8;
  padding-top:var(--status-h);
  padding-left:var(--rail-w);
  overflow-x:hidden;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background:
    radial-gradient(90% 70% at 100% 0%,rgba(15,46,38,.92),transparent 62%),
    radial-gradient(75% 60% at 0% 100%,rgba(194,87,26,.16),transparent 64%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.34;
  background-image:
    linear-gradient(rgba(61,224,208,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(61,224,208,.06) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 0%,transparent 72%);
  mask-image:radial-gradient(120% 90% at 50% 0%,#000 0%,transparent 72%);
}
main{display:block;position:relative;z-index:1}
#main-content{scroll-margin-top:calc(var(--status-h) + 1.5rem)}

h1,h2,h3,h4,h5{font-family:var(--font-display);font-weight:900;line-height:1.12;letter-spacing:-.01em}
h1{font-size:clamp(2.75rem,7vw,6rem);line-height:.98;letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,3vw,2.5rem);line-height:1.15}
h3{font-size:clamp(1.15rem,1.6vw,1.5rem)}
p{max-width:68ch}
strong{font-weight:800;color:var(--bone)}
::selection{background:var(--gold);color:var(--black)}

:focus{outline:none}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em}
.measure{max-width:68ch}
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad-x)}

/* ---------- 3. 栅格与章节节奏 ---------- */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(1rem,2vw,2rem)}
.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-9{grid-column:span 9}
.col-12{grid-column:span 12}

.section{position:relative;padding-block:clamp(3rem,7vw,6.5rem)}
.section__head{display:flex;flex-direction:column;gap:.75rem;margin-bottom:clamp(1.5rem,3vw,2.75rem);max-width:60ch}
.eyebrow{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);display:flex;align-items:center;gap:.6rem;
}
.eyebrow::before{content:"";width:2rem;height:1px;background:var(--copper)}
.section__title{color:var(--bone)}
.lede{font-size:1.05rem;color:var(--moss);max-width:60ch}

.divider-cut{
  height:calc(1px + 1.2vw);margin-block:clamp(2rem,5vw,4rem);
  background:linear-gradient(90deg,transparent,var(--line-gold) 30%,var(--line-cyan) 78%,transparent);
  clip-path:polygon(0 100%,100% 0,100% 2px,0 calc(100% - 2px));
  transform:skewY(-1.2deg);
}

/* ---------- 4. 框景容器 ---------- */
.frame{
  position:relative;
  padding:clamp(1.5rem,4vw,3.25rem);
  background:linear-gradient(180deg,rgba(15,46,38,.72),rgba(7,26,21,.92));
  border:1px solid rgba(244,239,228,.16);
  box-shadow:var(--shadow-lg);
}
.frame::before,.frame::after{
  content:"";position:absolute;left:-1px;right:-1px;height:11px;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(245,165,36,.6) 0 1px,transparent 1px 30px);
}
.frame::before{top:-6px}
.frame::after{bottom:-6px;background-image:repeating-linear-gradient(90deg,rgba(61,224,208,.5) 0 1px,transparent 1px 30px)}

/* ---------- 5. 按钮 ---------- */
.btn{
  --btn-bg:var(--gold);--btn-fg:var(--black);
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:.8rem 1.15rem;border-radius:var(--radius);
  border:1px solid transparent;
  font-family:var(--font-display);font-weight:800;font-size:.95rem;letter-spacing:.02em;line-height:1.2;
  background:var(--btn-bg);color:var(--btn-fg);cursor:pointer;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,transform .16s ease;
}
.btn:hover{background:var(--gold-bright);color:var(--black)}
.btn:active{background:var(--copper);color:var(--bone);transform:translateY(1px)}
.btn--gold{background:var(--gold);color:var(--black)}
.btn--ghost{background:transparent;color:var(--gold-bright);border-color:var(--line-gold)}
.btn--ghost:hover{background:rgba(245,165,36,.14);color:var(--gold-bright);border-color:var(--gold)}
.btn--glass{
  background:var(--glass);color:var(--bone);border-color:rgba(244,239,228,.2);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.btn--glass:hover{background:rgba(244,239,228,.13);color:var(--bone);border-color:var(--cyan)}
.btn--block{width:100%}

.copy-btn{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
  padding:.2rem .5rem;border:1px solid var(--line-cyan);border-radius:var(--radius);
  color:var(--cyan);background:transparent;
  transition:background-color .16s ease,color .16s ease;
}
.copy-btn:hover{background:rgba(61,224,208,.16);color:var(--bone)}

/* ---------- 6. 头部：状态条 ---------- */
.site-header{position:relative;z-index:80}
.skip-link{
  position:fixed;top:.5rem;left:.5rem;z-index:140;
  padding:.6rem 1rem;border-radius:var(--radius);
  background:var(--gold);color:var(--black);font-weight:800;
  transform:translateY(-200%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline-color:var(--black)}

.status-bar{
  position:fixed;top:0;left:0;right:0;height:var(--status-h);z-index:75;
  display:flex;align-items:center;
  background:linear-gradient(90deg,rgba(7,26,21,.97),rgba(15,46,38,.93) 62%,rgba(7,26,21,.97));
  border-bottom:1px solid var(--line-gold);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  color:var(--moss);
}
.status-bar__inner{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding-inline:var(--pad-x);
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
}
.status-meta{display:flex;align-items:center;gap:.55rem;flex-wrap:wrap;max-width:none}
.status-meta__k{color:var(--moss)}
.status-meta__v{color:var(--gold-bright);font-weight:500}
.status-meta__sep{color:var(--copper)}
.status-live{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);flex:0 0 auto;
  animation:livepulse 2.6s ease-out infinite;
}
@keyframes livepulse{
  0%{box-shadow:0 0 0 0 rgba(61,224,208,.55)}
  70%{box-shadow:0 0 0 8px rgba(61,224,208,0)}
  100%{box-shadow:0 0 0 0 rgba(61,224,208,0)}
}
.status-link{
  color:var(--cyan);border-bottom:1px solid var(--line-cyan);padding-bottom:1px;
  transition:color .16s ease,border-color .16s ease;
}
.status-link:hover{color:var(--bone);border-color:var(--bone)}

/* ---------- 7. 头部：移动细条 ---------- */
.topstrip{display:none}
.nav-toggle{display:none}
.nav-scrim{display:none}

/* ---------- 8. 头部：左侧导航轨道 ---------- */
.rail{
  position:fixed;top:var(--status-h);left:0;bottom:0;width:var(--rail-w);z-index:70;
  display:flex;flex-direction:column;gap:1.4rem;
  padding:1.7rem 1.1rem 1.3rem;
  background:linear-gradient(180deg,#0F2E26 0%,#0A211C 46%,#071A15 100%);
  border-right:1px solid rgba(61,224,208,.16);
  overflow-y:auto;overscroll-behavior:contain;
}
.rail::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:repeating-linear-gradient(180deg,rgba(244,239,228,.045) 0 1px,transparent 1px 22px);
}
.rail > *{position:relative}

.brand{display:flex;align-items:center;gap:.7rem;color:var(--bone)}
.brand__badge{
  width:2.6rem;height:2.6rem;flex:0 0 auto;display:grid;place-items:center;
  font-family:var(--font-display);font-weight:900;font-size:1.25rem;line-height:1;color:var(--black);
  background:linear-gradient(145deg,var(--gold-bright),var(--gold) 55%,var(--copper));
  border-radius:3px 3px 12px 3px;
  box-shadow:inset 0 0 0 1px rgba(11,15,14,.55),0 10px 22px -12px rgba(245,165,36,.95);
}
.brand__name{display:block;font-family:var(--font-display);font-weight:900;font-size:1.05rem;line-height:1.25;letter-spacing:.02em}
.brand__tag{display:block;font-family:var(--font-mono);font-size:.63rem;letter-spacing:.12em;text-transform:uppercase;color:var(--moss)}

.rail__quick{display:none;gap:.5rem}
.rail__nav{display:flex;flex-direction:column;gap:.55rem}
.rail__title{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--moss)}
.rail__list{display:flex;flex-direction:column;gap:.12rem}
.rail__link{
  position:relative;display:flex;align-items:center;gap:.7rem;
  padding:.7rem .8rem;border-radius:2px;color:var(--bone);
  font-family:var(--font-display);font-weight:800;font-size:.98rem;letter-spacing:.01em;
  transition:background-color .16s ease,color .16s ease;
}
.rail__link::before{
  content:"";position:absolute;left:0;top:50%;translate:0 -50%;
  width:3px;height:0;background:var(--cyan);
  transition:height .24s var(--ease);
}
.rail__link:hover{background:var(--glass)}
.rail__link:hover::before{height:58%}
.rail__link[aria-current="page"]{
  color:var(--gold-bright);
  background:linear-gradient(90deg,rgba(245,165,36,.16),rgba(245,165,36,0) 92%);
}
.rail__link[aria-current="page"]::before{height:100%;background:var(--cyan)}
.rail__num{font-family:var(--font-mono);font-size:.7rem;font-weight:500;letter-spacing:.06em;color:var(--moss)}
.rail__link[aria-current="page"] .rail__num{color:var(--cyan)}
.rail__label{flex:1}

.rail__foot{
  margin-top:auto;display:flex;flex-direction:column;gap:.65rem;
  padding-top:1.1rem;border-top:1px dashed rgba(244,239,228,.16);
}
.rail__note{font-size:.72rem;line-height:1.65;color:var(--moss);max-width:none}

/* ---------- 9. 滚动进度 / 返回顶部 / 轻提示 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:110;pointer-events:none;
  background:rgba(244,239,228,.07);
}
.scroll-progress span{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold),var(--gold-bright) 45%,var(--cyan));
}

.to-top{
  position:fixed;right:1.4rem;bottom:1.4rem;z-index:78;
  width:3rem;height:3rem;border-radius:50%;
  display:grid;place-items:center;
  background:rgba(7,26,21,.92);color:var(--gold-bright);
  border:1px solid rgba(245,165,36,.45);
  font-family:var(--font-mono);font-weight:500;font-size:1rem;
  box-shadow:0 16px 34px -16px #000;
  opacity:0;transform:translateY(1rem);pointer-events:none;
  transition:opacity .22s ease,transform .22s ease,background-color .16s ease;
}
.to-top::before{
  content:"";position:absolute;inset:-7px;border-radius:50%;pointer-events:none;
  background:repeating-conic-gradient(from 0deg,rgba(245,165,36,.55) 0deg 2deg,transparent 2deg 12deg);
  -webkit-mask:radial-gradient(circle,transparent 0 62%,#000 62%);
  mask:radial-gradient(circle,transparent 0 62%,#000 62%);
}
.to-top[data-visible]{opacity:1;transform:none;pointer-events:auto}
.to-top:hover{background:rgba(245,165,36,.2)}
.to-top__glyph{line-height:1}

.toast{
  position:fixed;left:50%;bottom:1.6rem;z-index:130;
  max-width:min(90vw,26rem);
  padding:.7rem 1.1rem;border-radius:var(--radius);
  background:rgba(11,15,14,.95);color:var(--bone);
  border:1px solid rgba(61,224,208,.5);
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.04em;
  opacity:0;transform:translate(-50%,1.5rem);pointer-events:none;
  transition:opacity .2s ease,transform .2s ease;
}
.toast[data-open]{opacity:1;transform:translate(-50%,0)}

/* ---------- 10. 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(4rem,9vw,7rem);
  padding:clamp(2.75rem,5vw,4rem) var(--pad-x) 1.6rem;
  background:linear-gradient(180deg,#071A15 0%,#040C0A 100%);
  color:var(--moss);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,var(--gold),var(--copper) 48%,var(--cyan));
}
.site-footer::after{
  content:"";position:absolute;top:2px;left:0;right:0;height:10px;pointer-events:none;opacity:.75;
  background-image:repeating-linear-gradient(90deg,rgba(245,165,36,.5) 0 1px,transparent 1px 40px);
}
.footer-grid{
  display:grid;gap:2.25rem 2.5rem;
  grid-template-columns:1.35fr .95fr .95fr 1.35fr;
  max-width:var(--maxw);margin-inline:auto;
}
.footer-col{display:flex;flex-direction:column;gap:.9rem}
.footer-col__title{
  font-family:var(--font-mono);font-size:.68rem;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--gold);
}
.brand--footer .brand__name{font-size:1rem}
.footer-lede{font-size:.95rem;line-height:1.7;color:var(--bone);max-width:32ch}
.footer-meta{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--moss)}
.footer-list{display:flex;flex-direction:column;gap:.4rem}
.footer-list a{
  position:relative;display:inline-block;padding-left:.9rem;
  font-size:.9rem;color:var(--moss);
  transition:color .16s ease;
}
.footer-list a::before{
  content:"";position:absolute;left:0;top:.75em;width:.5rem;height:1px;background:var(--copper);
  transition:width .16s ease,background-color .16s ease;
}
.footer-list a:hover{color:var(--gold-bright)}
.footer-list a:hover::before{width:.75rem;background:var(--cyan)}
.footer-list a[aria-current="page"]{color:var(--gold-bright)}
.footer-contact{display:flex;flex-direction:column;gap:.7rem}
.footer-contact li{display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem}
.footer-contact__k{
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--moss);min-width:4.75rem;
}
.footer-contact__v{font-size:.9rem;color:var(--bone);word-break:break-word}
.footer-note{font-size:.78rem;line-height:1.7;color:var(--moss);max-width:34ch}
.footer-base{
  max-width:var(--maxw);margin:clamp(2rem,4vw,3rem) auto 0;
  padding-top:1.1rem;border-top:1px dashed rgba(244,239,228,.14);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.75rem 1.5rem;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;
}
.footer-base__copy,.footer-base__icp{color:var(--moss);max-width:none}
.footer-base__links{display:flex;flex-wrap:wrap;gap:1rem}
.footer-base__links a{color:var(--moss);border-bottom:1px solid transparent;transition:color .16s ease,border-color .16s ease}
.footer-base__links a:hover{color:var(--cyan);border-color:var(--cyan)}

/* ---------- 11. 通用组件 ---------- */
.card{
  position:relative;display:flex;flex-direction:column;gap:.85rem;
  padding:clamp(1.1rem,2.2vw,1.75rem);
  border:1px solid var(--line);border-radius:var(--radius);
}
.card--solid{background:linear-gradient(180deg,#0F2E26,#0A211C);border-color:rgba(244,239,228,.13)}
.card--glass{
  background:var(--glass);border-color:rgba(244,239,228,.2);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.card__title{font-family:var(--font-display);font-weight:800;font-size:1.15rem;color:var(--bone)}
.card__body{font-size:.95rem;color:var(--bone);max-width:56ch}
.card__meta{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;color:var(--moss)}

.tag,.badge{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.22rem .6rem;border-radius:2px;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.08em;
}
.tag{border:1px solid var(--line-cyan);color:var(--cyan)}
.badge{background:rgba(245,165,36,.16);border:1px solid var(--line-gold);color:var(--gold-bright)}

.breadcrumb{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--moss)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:.4rem;color:var(--copper)}
.breadcrumb a{color:var(--moss);transition:color .16s ease}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb li[aria-current="page"]{color:var(--gold-bright)}

.toc{display:flex;flex-direction:column;gap:.6rem}
.toc__title{font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;color:var(--moss)}
.toc__list{display:flex;flex-direction:column;gap:.15rem}
.toc__link{
  position:relative;display:block;padding:.4rem .6rem .4rem .9rem;
  font-size:.88rem;color:var(--moss);
  transition:color .16s ease,background-color .16s ease;
}
.toc__link::before{
  content:"";position:absolute;left:0;top:50%;translate:0 -50%;
  width:2px;height:0;background:var(--cyan);transition:height .2s var(--ease);
}
.toc__link:hover{color:var(--bone)}
.toc__link[aria-current]{color:var(--gold-bright);background:rgba(245,165,36,.09)}
.toc__link[aria-current]::before{height:70%}

.tabs{display:flex;flex-direction:column;gap:1.25rem}
.tablist{display:flex;flex-wrap:wrap;gap:.4rem;border-bottom:1px solid var(--line);padding-bottom:.6rem}
.tab{
  padding:.5rem .95rem;border:1px solid transparent;border-radius:2px;
  font-family:var(--font-display);font-weight:800;font-size:.9rem;color:var(--moss);
  transition:color .16s ease,background-color .16s ease,border-color .16s ease;
}
.tab:hover{color:var(--bone);background:var(--glass)}
.tab[aria-selected="true"]{color:var(--black);background:var(--gold);border-color:var(--gold)}
.tab-panel[hidden]{display:none}
.tab-panel{padding-top:.4rem}

.data-table{font-size:.92rem}
.data-table caption{
  text-align:left;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--moss);padding-bottom:.75rem;
}
.data-table th,.data-table td{
  padding:.7rem .8rem;text-align:left;border-bottom:1px solid var(--line);
  vertical-align:top;
}
.data-table thead th{
  font-family:var(--font-mono);font-size:.7rem;font-weight:500;letter-spacing:.1em;
  text-transform:uppercase;color:var(--moss);border-bottom-color:var(--line-gold);
}
.data-table tbody tr:nth-child(even){background:rgba(244,239,228,.025)}
.data-table td.num,.data-table th.num{font-family:var(--font-mono);letter-spacing:.02em;color:var(--gold-bright)}

.figure{
  position:relative;margin:0;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--green-deep);overflow:hidden;
}
.figure__frame{
  position:relative;aspect-ratio:var(--ratio,16/9);display:block;
  background:
    linear-gradient(135deg,rgba(245,165,36,.16),rgba(15,46,38,.55) 46%,rgba(7,26,21,.94)),
    repeating-linear-gradient(135deg,rgba(244,239,228,.05) 0 2px,transparent 2px 12px);
}
.figure__frame img{width:100%;height:100%;object-fit:cover}
.figure__cap{
  display:flex;flex-wrap:wrap;gap:.6rem;align-items:baseline;
  padding:.7rem .9rem;border-top:1px solid rgba(244,239,228,.1);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:var(--moss);
}
.figure--wide{--ratio:21/9}
.figure--tall{--ratio:3/4}
.figure--square{--ratio:1/1}
.figure::before{
  content:"";position:absolute;top:0;left:0;width:18px;height:18px;z-index:2;
  border-top:2px solid var(--gold);border-left:2px solid var(--gold);
}
.figure::after{
  content:"";position:absolute;right:0;bottom:0;width:18px;height:18px;z-index:2;
  border-bottom:2px solid var(--cyan);border-right:2px solid var(--cyan);
}

/* ---------- 12. 显现动效 ---------- */
html.js-ready [data-reveal]{opacity:0;transform:translateY(12px)}
[data-reveal]{
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.js-ready [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 13. 平板 ---------- */
@media (max-width:1023px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9{grid-column:span 6}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ---------- 14. 移动端：细条 + 抽屉 ---------- */
@media (max-width:1023px){
  body{padding-top:var(--topbar-h);padding-left:0}
  #main-content{scroll-margin-top:calc(var(--topbar-h) + 1rem)}
  .status-bar{display:none}

  .topstrip{
    display:flex;align-items:center;gap:.7rem;
    position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:80;
    padding-inline:1rem;
    background:linear-gradient(90deg,rgba(7,26,21,.98),rgba(15,46,38,.95));
    border-bottom:1px solid var(--line-gold);
    -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  }
  .brand-mark{
    width:2.1rem;height:2.1rem;flex:0 0 auto;display:grid;place-items:center;
    font-family:var(--font-display);font-weight:900;font-size:1rem;line-height:1;color:var(--black);
    background:linear-gradient(145deg,var(--gold-bright),var(--copper));
    border-radius:3px 3px 10px 3px;
  }
  .topstrip__v{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--gold-bright)}
  .topstrip__meta{
    margin-left:auto;display:flex;align-items:center;gap:.4rem;
    font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;max-width:none;
  }
  .topstrip__meta .status-meta__v{color:var(--cyan)}

  .nav-toggle{
    display:inline-flex;align-items:center;gap:.5rem;
    padding:.45rem .7rem .45rem .6rem;border:1px solid var(--line-gold);border-radius:var(--radius);
    background:var(--glass);color:var(--bone);
    font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;
    -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  }
  .nav-toggle__bars{display:grid;gap:3px;width:14px}
  .nav-toggle__bars i{display:block;height:2px;background:var(--gold);transition:transform .22s var(--ease),opacity .2s ease}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}
  .nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}

  .rail{
    top:var(--topbar-h);left:auto;right:0;bottom:0;
    width:min(86vw,20rem);z-index:70;
    border-right:0;border-left:1px solid rgba(61,224,208,.2);
    box-shadow:-30px 0 80px -30px #000;
    transform:translateX(104%);
    transition:transform .3s var(--ease);
  }
  .rail[data-open]{transform:translateX(0)}
  .rail__quick{display:grid}

  .nav-scrim{
    display:block;position:fixed;inset:0;z-index:69;
    background:rgba(4,9,8,.7);
    -webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);
    opacity:0;pointer-events:none;transition:opacity .3s ease;
  }
  .nav-scrim[data-open]{opacity:1;pointer-events:auto}
  body.is-nav-open{overflow:hidden}

  .to-top{right:.85rem;bottom:.85rem;width:2.65rem;height:2.65rem}
  .toast{bottom:1rem}
}

/* ---------- 15. 手机 ---------- */
@media (max-width:639px){
  body{font-size:16px;line-height:1.78}
  .grid-12{grid-template-columns:1fr;gap:1rem}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr;gap:1.9rem}
  .footer-lede,.footer-note{max-width:none}
  .frame{padding:1.15rem}
  .data-table{font-size:.85rem}
  .data-table th,.data-table td{padding:.55rem .5rem}
  .tablist{overflow-x:auto;flex-wrap:nowrap}
  .tab{white-space:nowrap}
  .footer-base__links{gap:.75rem}
}

/* ---------- 16. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js-ready [data-reveal]{opacity:1;transform:none}
  .scroll-progress span{transition:none}
}