/* =========================================================
   企鹅看台 · 共享样式表  /assets/site.css
   深空蓝场域 + 企鹅橙 / 荧光青 / 洋红 的夜间球场语言
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol{margin:0;}
ul[class],ol[class]{list-style:none;padding:0;}
img,svg,video{max-width:100%;height:auto;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
a{color:inherit;}
table{border-collapse:collapse;width:100%;}
[hidden]{display:none !important;}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-900:#0A1122;
  --ink-800:#12203A;
  --ink-700:#16294A;
  --paper:#F2E9D8;
  --paper-hi:#FCF8F0;
  --ink-text:#17120F;
  --orange:#FF6A2B;
  --cyan:#25E6C8;
  --magenta:#FF3E86;
  --silver:#A8B6CC;
  --hairline:#2B3B58;
  --text-dark:#D9E3F5;

  --tilt:8deg;
  --shell:1240px;
  --gutter:clamp(16px,4vw,48px);
  --header-h:78px;
  --gap:clamp(14px,1.8vw,24px);

  --ease:cubic-bezier(.22,1,.36,1);
  --t-fast:150ms;
  --t-mid:280ms;
  --t-slow:400ms;

  --font-display:"PingFang SC","Noto Sans SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 3. 基础与中文排版 ---------- */
body{
  background:var(--ink-900);
  background-image:
    radial-gradient(1200px 600px at 82% -10%,rgba(37,230,200,.10),transparent 60%),
    radial-gradient(900px 520px at 6% 0%,rgba(255,106,43,.10),transparent 62%);
  background-repeat:no-repeat;
  color:var(--text-dark);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  overflow-x:hidden;
  overflow-wrap:break-word;
}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.2;letter-spacing:-.02em;font-weight:700;}
p{text-wrap:pretty;}
::selection{background:var(--orange);color:var(--ink-900);}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;}

/* ---------- 4. 排版组件 ---------- */
.display-title{font-family:var(--font-display);font-weight:900;font-size:clamp(44px,7vw,96px);line-height:.94;letter-spacing:-.035em;color:#fff;margin:0;}
.lede{font-size:clamp(16px,1.5vw,20px);line-height:1.7;color:var(--silver);max-width:48ch;}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--silver);}
.annotation{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--silver);}
.annotation--vertical{writing-mode:vertical-rl;letter-spacing:.32em;text-transform:uppercase;}
.mono-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}
.link-arrow{display:inline-flex;align-items:center;gap:8px;color:var(--cyan);text-decoration:none;font-weight:600;border-bottom:1px solid rgba(37,230,200,.35);padding-bottom:2px;transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);}
.link-arrow::after{content:"→";font-family:var(--font-mono);transition:transform var(--t-fast) var(--ease);}
.link-arrow:hover{color:#fff;border-color:var(--orange);}
.link-arrow:hover::after{transform:translateX(4px);}

.prose{max-width:72ch;font-size:17px;line-height:1.75;color:var(--text-dark);}
.prose > * + *{margin-top:1.05em;}
.prose h2{font-size:clamp(24px,3vw,34px);font-weight:900;letter-spacing:-.025em;color:#fff;margin-top:1.6em;}
.prose h3{font-size:20px;font-weight:700;color:#fff;margin-top:1.4em;}
.prose ul,.prose ol{padding-left:1.35em;display:grid;gap:.45em;}
.prose li::marker{color:var(--orange);}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;}
.prose a:hover{color:#fff;}
.prose blockquote{border-left:2px solid var(--orange);padding:4px 0 4px 18px;color:var(--silver);}
.prose code{font-family:var(--font-mono);font-size:.92em;color:var(--cyan);background:rgba(37,230,200,.10);padding:2px 6px;}
.prose table{font-size:15px;margin-top:1.2em;}
.prose th,.prose td{border-bottom:1px solid var(--hairline);padding:10px 12px;text-align:left;}
.prose th{color:var(--cyan);font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;}

/* ---------- 5. 布局骨架 ---------- */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter);}
.site-main{padding-top:var(--header-h);}
.site-main--flush{padding-top:0;}
.section{padding:clamp(48px,7vw,96px) 0;}
.section--tight{padding:clamp(28px,4vw,52px) 0;}
.hairline{border:0;border-top:1px solid var(--hairline);margin:0;}
.grid-field{background-image:
  linear-gradient(rgba(43,59,88,.42) 1px,transparent 1px),
  linear-gradient(90deg,rgba(43,59,88,.42) 1px,transparent 1px);
  background-size:64px 64px;background-position:center top;}

.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);}
.span-2{grid-column:span 2;}
.span-3{grid-column:span 3;}
.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-9{grid-column:span 9;}
.span-10{grid-column:span 10;}
.span-12{grid-column:span 12;}

.split{display:grid;grid-template-columns:minmax(0,42fr) minmax(0,58fr);gap:clamp(24px,4vw,56px);align-items:start;}
.split__brand{min-width:0;}
.split__content{min-width:0;}
.split--tilt{position:relative;}
.split--tilt::after{content:"";position:absolute;top:0;bottom:0;left:42%;width:1px;
  background:linear-gradient(180deg,transparent,var(--hairline) 12%,var(--hairline) 88%,transparent);
  transform:rotate(var(--tilt));transform-origin:top center;pointer-events:none;}

.panel{background:var(--ink-800);border:1px solid var(--hairline);padding:clamp(20px,3vw,36px);}
.panel--paper{background:var(--paper);border-color:#D9CDB6;color:var(--ink-text);}
.panel--paper .prose{color:var(--ink-text);}
.panel--paper .prose h2,.panel--paper .prose h3{color:var(--ink-text);}
.panel--paper .prose a{color:#B8400F;}
.panel--paper .prose code{color:#0A5F52;background:rgba(37,230,200,.16);}
.panel--paper .prose blockquote{color:#4A423A;border-color:#B8400F;}

/* 描边章节号 */
.chapter{display:flex;gap:clamp(12px,2vw,24px);align-items:flex-start;}
.chapter__num{font-family:var(--font-mono);font-size:clamp(64px,9vw,120px);font-weight:700;line-height:.82;
  letter-spacing:-.05em;color:rgba(255,106,43,.14);-webkit-text-stroke:1.5px var(--orange);}
.chapter__body{min-width:0;padding-top:6px;}
.chapter__title{font-size:clamp(24px,3.4vw,40px);font-weight:900;color:#fff;letter-spacing:-.03em;}
.chapter__note{margin-top:10px;}
.chapter__note.annotation--vertical{margin-top:0;}

/* ---------- 6. 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-size:14px;font-weight:600;line-height:1;letter-spacing:.02em;
  padding:13px 20px;border:1px solid transparent;background:none;color:inherit;text-decoration:none;
  cursor:pointer;transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);}
.btn--primary{background:var(--orange);color:var(--ink-900);border-color:var(--orange);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);}
.btn--primary:hover,.btn--primary:focus-visible{background:#FF8147;border-color:#FF8147;}
.btn--ghost{background:transparent;border-color:var(--hairline);color:var(--cyan);}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);background:rgba(37,230,200,.08);}
.btn--outline{background:transparent;border-color:var(--paper);color:var(--paper);}
.btn--outline:hover,.btn--outline:focus-visible{background:var(--paper);color:var(--ink-text);}
.btn--sm{padding:9px 14px;font-size:13px;}
.btn--block{width:100%;}
.btn:active{transform:translateY(1px);}

/* ---------- 7. 页头 ---------- */
.skip-link{position:fixed;top:10px;left:10px;z-index:140;background:var(--cyan);color:var(--ink-900);
  font-weight:700;font-size:14px;padding:11px 16px;text-decoration:none;
  transform:translateY(-180%);transition:transform var(--t-mid) var(--ease);}
.skip-link:focus{transform:translateY(0);}

.site-header{position:fixed;top:0;left:0;right:0;z-index:120;color:var(--text-dark);
  background:linear-gradient(180deg,rgba(10,17,34,.92),rgba(10,17,34,0));
  transition:background var(--t-slow) var(--ease),box-shadow var(--t-slow) var(--ease),border-color var(--t-slow) var(--ease);
  border-bottom:1px solid transparent;}
.site-header[data-scrolled="true"]{background:rgba(10,17,34,.96);border-bottom-color:var(--hairline);
  box-shadow:0 12px 32px rgba(0,0,0,.45);}
.header-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(43,59,88,.6);overflow:hidden;}
.header-progress__bar{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange) 62%,var(--magenta));}
.header-inner{position:relative;width:100%;max-width:var(--shell);margin:0 auto;padding:0 var(--gutter);
  min-height:var(--header-h);display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  transition:min-height var(--t-slow) var(--ease);}
.site-header[data-scrolled="true"] .header-inner{min-height:60px;}

.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex:0 0 auto;min-width:0;}
.brand__mark{position:relative;flex:0 0 auto;width:34px;height:34px;border:1px solid var(--orange);
  clip-path:polygon(0 0,100% 0,100% 74%,74% 100%,0 100%);display:block;background:rgba(255,106,43,.08);}
.brand__mark::before{content:"";position:absolute;left:9px;top:10px;width:13px;height:13px;background:var(--orange);}
.brand__mark::after{content:"";position:absolute;right:4px;top:4px;width:5px;height:5px;background:var(--cyan);}
.brand__text{display:flex;flex-direction:column;min-width:0;}
.brand__name{font-family:var(--font-display);font-weight:900;font-size:18px;letter-spacing:.04em;color:#fff;line-height:1.2;}
.brand__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--silver);line-height:1.4;white-space:nowrap;}

.header-status{display:flex;align-items:center;gap:8px;margin:0;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.08em;color:var(--silver);white-space:nowrap;}
.header-status__dot{width:7px;height:7px;background:var(--cyan);flex:0 0 auto;
  box-shadow:0 0 0 4px rgba(37,230,200,.16);animation:pk-pulse 2200ms var(--ease) infinite;}
@keyframes pk-pulse{0%,100%{opacity:1;}50%{opacity:.35;}}

.site-nav{margin-left:auto;display:flex;align-items:center;gap:clamp(12px,2vw,28px);}
.site-nav__list{display:flex;align-items:center;gap:clamp(8px,1.5vw,22px);}
.site-nav__item{flex:0 0 auto;}
.site-nav__link{position:relative;display:inline-block;padding:8px 2px;font-size:14px;font-weight:500;
  color:var(--silver);text-decoration:none;white-space:nowrap;transition:color var(--t-fast) var(--ease);}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:2px;height:2px;background:var(--orange);
  transform:scaleX(0);transform-origin:0 50%;transition:transform var(--t-mid) var(--ease);}
.site-nav__link:hover,.site-nav__link:focus-visible{color:#fff;}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:#fff;font-weight:700;}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]::before{content:"";position:absolute;left:-9px;top:50%;width:4px;height:4px;
  background:var(--cyan);transform:translateY(-50%) rotate(45deg);}
.site-nav__actions{display:flex;align-items:center;gap:10px;}

.nav-toggle{display:none;align-items:center;gap:9px;margin-left:auto;padding:10px 12px;
  background:transparent;border:1px solid var(--hairline);color:var(--text-dark);cursor:pointer;
  font-size:13px;font-weight:600;transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);}
.nav-toggle:hover{border-color:var(--cyan);color:#fff;}
.nav-toggle__bars{display:grid;gap:4px;width:18px;}
.nav-toggle__bars span{display:block;height:2px;background:var(--orange);transition:transform var(--t-mid) var(--ease),opacity var(--t-fast) var(--ease);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.nav-toggle__label{letter-spacing:.04em;}

/* ---------- 8. 数据组件 ---------- */
.data-bar{display:grid;grid-template-columns:auto minmax(60px,1fr) auto;align-items:center;gap:16px;
  padding:14px 18px;background:var(--ink-800);border:1px solid var(--hairline);border-left:3px solid var(--cyan);}
.data-bar__label{font-size:14px;color:var(--text-dark);white-space:nowrap;}
.data-bar__meter{position:relative;height:6px;background:var(--ink-700);overflow:hidden;}
.data-bar__fill{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--orange));}
.data-bar__value{font-family:var(--font-mono);font-size:15px;color:var(--cyan);text-align:right;min-width:56px;}

.ring{--value:0;position:relative;width:clamp(110px,18vw,160px);aspect-ratio:1;border-radius:50%;
  background:conic-gradient(var(--cyan) calc(var(--value) * 1%),var(--hairline) 0);
  display:grid;place-items:center;transition:background var(--t-slow) var(--ease);}
.ring__core{position:absolute;inset:13%;border-radius:50%;background:var(--ink-900);border:1px solid var(--hairline);
  display:grid;place-items:center;text-align:center;}
.ring__value{font-family:var(--font-mono);font-size:clamp(20px,3vw,28px);font-weight:700;color:var(--cyan);line-height:1;}
.ring__tip{position:absolute;left:50%;bottom:-30px;transform:translateX(-50%);white-space:nowrap;
  font-family:var(--font-mono);font-size:12px;color:var(--ink-900);background:var(--cyan);padding:4px 8px;
  opacity:0;pointer-events:none;transition:opacity var(--t-fast) var(--ease);}
.ring:hover .ring__tip,.ring:focus-within .ring__tip{opacity:1;}

.timeline{position:relative;display:flex;gap:clamp(12px,2vw,24px);overflow-x:auto;padding:26px 2px 18px;
  scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;}
.timeline::before{content:"";position:absolute;left:0;right:0;top:32px;height:1px;background:var(--hairline);}
.timeline__item{position:relative;flex:0 0 auto;scroll-snap-align:start;min-width:150px;padding-top:36px;}
.timeline__item::before{content:"";position:absolute;top:26px;left:0;width:11px;height:11px;background:var(--ink-900);
  border:1px solid var(--cyan);transform:rotate(45deg);transition:background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);}
.timeline__item[data-state="current"]::before{background:var(--orange);border-color:var(--orange);
  box-shadow:0 0 0 5px rgba(255,106,43,.18);}
.timeline__round{font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;color:var(--cyan);}
.timeline__label{font-size:15px;color:var(--text-dark);margin-top:2px;}

.stat{display:flex;flex-direction:column;gap:4px;}
.stat__value{font-family:var(--font-mono);font-size:clamp(26px,3.4vw,38px);font-weight:700;color:var(--cyan);line-height:1;}
.stat__label{font-size:12px;letter-spacing:.12em;color:var(--silver);text-transform:uppercase;}

/* ---------- 9. 卡片与标记 ---------- */
.card{position:relative;display:flex;flex-direction:column;gap:12px;background:var(--ink-800);
  border:1px solid var(--hairline);padding:clamp(16px,2.2vw,26px);
  transition:border-color var(--t-mid) var(--ease),transform var(--t-mid) var(--ease),background var(--t-mid) var(--ease);}
.card::before{content:"";position:absolute;left:0;top:0;width:32px;height:2px;background:var(--cyan);}
.card:hover{border-color:var(--cyan);transform:translateY(-3px);background:var(--ink-700);}
.card__title{font-size:18px;font-weight:700;color:#fff;letter-spacing:-.01em;}
.card__meta{font-family:var(--font-mono);font-size:12px;color:var(--silver);letter-spacing:.06em;}

.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.08em;padding:4px 8px;border:1px solid var(--hairline);color:var(--silver);}
.tag--orange{border-color:var(--orange);color:var(--orange);}
.tag--cyan{border-color:var(--cyan);color:var(--cyan);}
.tag--magenta{border-color:var(--magenta);color:var(--magenta);}

/* ---------- 10. 交互组件 ---------- */
.accordion{border-top:1px solid var(--hairline);}
.accordion__item{border-bottom:1px solid var(--hairline);}
.accordion__trigger{width:100%;display:flex;align-items:center;gap:16px;padding:18px 0;background:none;border:0;
  color:inherit;font:inherit;font-weight:600;font-size:16px;text-align:left;cursor:pointer;transition:color var(--t-fast) var(--ease);}
.accordion__trigger:hover{color:var(--cyan);}
.accordion__index{font-family:var(--font-mono);font-size:13px;color:var(--cyan);flex:0 0 auto;}
.accordion__icon{position:relative;flex:0 0 auto;margin-left:auto;width:14px;height:14px;}
.accordion__icon::before,.accordion__icon::after{content:"";position:absolute;background:var(--orange);
  transition:transform var(--t-mid) var(--ease),opacity var(--t-fast) var(--ease);}
.accordion__icon::before{left:0;top:6px;width:14px;height:2px;}
.accordion__icon::after{left:6px;top:0;width:2px;height:14px;}
.accordion__item[data-open="true"] .accordion__icon::after{transform:scaleY(0);}
.accordion__panel{display:grid;grid-template-rows:0fr;opacity:0;
  transition:grid-template-rows var(--t-mid) var(--ease),opacity var(--t-mid) var(--ease);}
.accordion__panel > *{overflow:hidden;}
.accordion__item[data-open="true"] .accordion__panel{grid-template-rows:1fr;opacity:1;}
.accordion__body{padding:0 0 20px;color:var(--silver);font-size:16px;max-width:70ch;}
.accordion__body > * + *{margin-top:.9em;}

.segmented{display:inline-flex;max-width:100%;overflow-x:auto;background:var(--ink-800);border:1px solid var(--hairline);
  -webkit-overflow-scrolling:touch;}
.segmented__btn{appearance:none;border:0;border-right:1px solid var(--hairline);background:none;color:var(--silver);
  font-family:var(--font-body);font-size:13px;font-weight:600;letter-spacing:.02em;padding:11px 16px;cursor:pointer;
  white-space:nowrap;transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease);}
.segmented__btn:last-child{border-right:0;}
.segmented__btn:hover{color:#fff;background:rgba(37,230,200,.08);}
.segmented__btn[aria-selected="true"]{background:var(--orange);color:var(--ink-900);}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;
  letter-spacing:.06em;color:var(--silver);}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px;}
.breadcrumbs__item + .breadcrumbs__item::before{content:"/";color:var(--hairline);}
.breadcrumbs__link{color:var(--silver);text-decoration:none;transition:color var(--t-fast) var(--ease);}
.breadcrumbs__link:hover{color:var(--cyan);}
.breadcrumbs__current{color:#fff;}

/* ---------- 12. 图片容器 ---------- */
.media-frame{position:relative;overflow:hidden;width:100%;aspect-ratio:16/9;border:1px solid var(--hairline);
  background:linear-gradient(135deg,var(--ink-800) 0%,#0D1932 55%,#152B45 100%);}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(1.06) contrast(1.05);}
.media-frame--wide{aspect-ratio:21/9;}
.media-frame--tall{aspect-ratio:3/4;}
.media-frame--square{aspect-ratio:1/1;}
.media-frame--tilt{clip-path:polygon(0 0,100% 0,100% 86%,86% 100%,0 100%);}
.media-frame__scan{position:absolute;inset:0;pointer-events:none;mix-blend-mode:screen;
  background:repeating-linear-gradient(180deg,rgba(37,230,200,.07) 0 1px,transparent 1px 4px);}
.media-frame__caption{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;
  background:linear-gradient(180deg,rgba(10,17,34,0),rgba(10,17,34,.92));
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--silver);}

/* ---------- 13. 显现动画 ---------- */
.reveal{opacity:0;transform:translateY(16px);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}

/* ---------- 14. 页脚 ---------- */
.site-footer{position:relative;margin-top:clamp(40px,6vw,88px);padding-bottom:clamp(84px,9vw,110px);
  background:var(--ink-800);border-top:1px solid var(--hairline);color:var(--text-dark);overflow:hidden;}
.site-footer::before{content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--orange),var(--cyan) 48%,var(--magenta));}
.footer-grid{width:100%;max-width:var(--shell);margin:0 auto;padding:clamp(40px,6vw,72px) var(--gutter) 0;
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1.9fr);gap:clamp(28px,5vw,64px);}
.footer-brand{min-width:0;}
.footer-brand__mark{font-family:var(--font-display);font-weight:900;font-size:clamp(20px,2.4vw,26px);
  letter-spacing:.02em;color:#fff;}
.footer-brand__line{margin-top:10px;font-size:15px;color:var(--silver);max-width:34ch;}
.footer-brand__domain{margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--cyan);}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px);}
.footer-col{min-width:0;}
.footer-col__title{font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:16px;}
.footer-col__list{display:grid;gap:10px;}
.footer-col__link{display:inline-block;font-size:15px;color:var(--text-dark);text-decoration:none;
  border-bottom:1px solid transparent;transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);}
.footer-col__link:hover,.footer-col__link:focus-visible{color:#fff;border-bottom-color:var(--orange);}

.footer-contact{width:100%;max-width:var(--shell);margin:clamp(32px,5vw,56px) auto 0;padding:24px var(--gutter) 0;
  border-top:1px solid var(--hairline);display:grid;gap:10px;}
.contact-line{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px;margin:0;font-size:14px;}
.contact-line__key{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--cyan);
  text-transform:uppercase;flex:0 0 auto;min-width:74px;}
.contact-line__value{color:var(--text-dark);}
.copy-btn{appearance:none;background:transparent;border:1px solid var(--hairline);color:var(--silver);
  font-size:12px;font-weight:600;padding:5px 10px;cursor:pointer;
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease),background var(--t-fast) var(--ease);}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan);}
.copy-btn.is-copied{border-color:var(--orange);color:var(--orange);background:rgba(255,106,43,.10);}

.footer-legal{width:100%;max-width:var(--shell);margin:24px auto 0;padding:18px var(--gutter) 0;
  border-top:1px solid var(--hairline);display:flex;flex-wrap:wrap;gap:10px 24px;justify-content:space-between;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--silver);}
.footer-legal__icp{color:var(--silver);}
.footer-legal__year{color:var(--silver);}

/* ---------- 15. 常驻悬浮球 ---------- */
.dock-ball{position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:110;
  display:inline-flex;align-items:center;gap:9px;padding:13px 18px;text-decoration:none;
  background:var(--ink-800);border:1px solid var(--cyan);color:var(--cyan);font-size:13px;font-weight:700;
  letter-spacing:.04em;box-shadow:0 14px 34px rgba(0,0,0,.5);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:background var(--t-fast) var(--ease),color var(--t-fast) var(--ease),transform var(--t-mid) var(--ease);}
.dock-ball:hover,.dock-ball:focus-visible{background:var(--cyan);color:var(--ink-900);transform:translateY(-2px);}
.dock-ball__pulse{position:relative;flex:0 0 auto;width:8px;height:8px;background:var(--orange);}
.dock-ball__pulse::after{content:"";position:absolute;inset:-5px;border:1px solid var(--orange);
  animation:pk-ring 2400ms var(--ease) infinite;}
@keyframes pk-ring{0%{transform:scale(.6);opacity:1;}100%{transform:scale(1.5);opacity:0;}}
.dock-ball__label{white-space:nowrap;}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1200px){
  .header-status{display:none;}
}
@media (max-width:1000px){
  :root{--header-h:64px;}
  .site-header[data-scrolled="true"] .header-inner{min-height:var(--header-h);}
  .nav-toggle{display:inline-flex;}
  .site-nav{position:fixed;left:0;right:0;top:var(--header-h);margin-left:0;
    flex-direction:column;align-items:stretch;gap:18px;padding:18px var(--gutter) 26px;
    background:var(--ink-800);border-top:1px solid var(--hairline);border-bottom:1px solid var(--hairline);
    max-height:calc(100dvh - var(--header-h));overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity var(--t-mid) var(--ease),transform var(--t-mid) var(--ease),visibility var(--t-mid) var(--ease);}
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none;box-shadow:0 24px 48px rgba(0,0,0,.55);}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;}
  .site-nav__link{display:block;padding:14px 0;font-size:16px;border-bottom:1px solid var(--hairline);}
  .site-nav__link::after{display:none;}
  .site-nav__link[aria-current="page"]::before{left:auto;right:2px;top:50%;}
  .site-nav__actions{flex-direction:column;align-items:stretch;}
  .site-nav__actions .btn{width:100%;padding:14px 18px;font-size:14px;}
  body.is-nav-open{overflow:hidden;}
  .split,.split--tilt{grid-template-columns:1fr;}
  .split--tilt::after{display:none;}
  .footer-grid{grid-template-columns:1fr;}
}
@media (max-width:760px){
  .grid{grid-template-columns:repeat(4,minmax(0,1fr));}
  .grid > [class*="span-"]{grid-column:span 4;}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
  .footer-legal{flex-direction:column;gap:8px;}
  .contact-line__key{min-width:100%;}
  .data-bar{grid-template-columns:minmax(0,1fr) auto;gap:10px 14px;}
  .data-bar__label{grid-column:1 / -1;}
  .chapter{flex-direction:column;gap:8px;}
  .chapter__num{font-size:clamp(52px,16vw,84px);}
  .dock-ball{padding:11px 14px;font-size:12px;}
}
@media (max-width:420px){
  .brand__meta{display:none;}
}

/* ---------- 17. 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;}
  .reveal{opacity:1;transform:none;}
  .header-progress{display:none;}
  .site-nav{transform:none;}
}