/* ============================================================
   安信 · 共享样式表 /assets/site.css
   顺序：变量 → 基础 → 命令栏 → 页脚 → 通用组件 → 响应式
   ============================================================ */

/* ---------- 01 设计变量 ---------- */
:root{
  --paper:#FBFAF7;
  --gray-50:#F2F0EB;
  --gray-200:#E2DED6;
  --gray-700:#4B4A45;
  --ink:#131A22;
  --blue-900:#0E2A47;
  --blue-700:#16436E;
  --blue-500:#2F72B4;
  --blue-100:#DCE8F4;
  --celadon-600:#3C7C68;
  --celadon-200:#D2E4DC;
  --brass-600:#A87B2F;
  --brass-100:#F3E6C9;
  --brass-ink:#6E4F16;      /* 铜金文字专用深色，用于 18px 以下正文保证对比度 */

  --line:#E2DED6;
  --line-strong:#CFC9BE;
  --line-blue:#C6D9EC;
  --line-celadon:#BCD8CD;
  --line-brass:#E6D2A6;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC",serif;
  --font-ui:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --t-12:.75rem; --t-14:.875rem; --t-16:1rem;  --t-20:1.25rem;
  --t-24:1.5rem; --t-32:2rem;    --t-44:2.75rem; --t-56:3.5rem;

  --r-sm:3px; --r-md:6px; --r-lg:10px; --r-pill:999px;

  --ease:cubic-bezier(.2,.7,.3,1);
  --fast:140ms var(--ease);
  --base:180ms var(--ease);

  --shell-max:1240px;
  --gutter:24px;
  --header-h:56px;
}

/* ---------- 02 基础 ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
html.nav-open,
html.nav-open body{overflow:hidden;}

body{
  margin:0;
  background:var(--paper);
  color:var(--gray-700);
  font-family:var(--font-ui);
  font-size:var(--t-16);
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;}
img,svg,video{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}

a{color:var(--blue-700);text-decoration:none;}

:focus-visible{
  outline:2px solid var(--blue-500);
  outline-offset:2px;
  border-radius:var(--r-sm);
}
.site-header :focus-visible,
.site-footer :focus-visible{
  outline-color:var(--brass-100);
}

::selection{background:var(--blue-100);color:var(--blue-900);}

#main-content{display:block;scroll-margin-top:calc(var(--header-h) + 24px);}
.section[id],[data-spy-section]{scroll-margin-top:calc(var(--header-h) + 28px);}

.skip-link{
  position:fixed;
  left:16px;
  top:-120px;
  z-index:120;
  padding:10px 18px;
  background:var(--brass-100);
  color:var(--blue-900);
  font-size:var(--t-14);
  font-weight:500;
  border:1px solid var(--brass-600);
  border-top:0;
  border-radius:0 0 var(--r-md) var(--r-md);
  transition:top var(--fast);
}
.skip-link:focus{top: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;
}

.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}

/* ---------- 03 容器与栅格 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.shell--narrow{max-width:860px;}

.dual{
  display:grid;
  grid-template-columns:minmax(0,1fr) 268px;
  gap:32px;
  align-items:start;
}

.grid{display:grid;gap:16px;}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr));}
.grid--bento{grid-template-columns:repeat(12,minmax(0,1fr));gap:16px;}

.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-12{grid-column:span 12;}

/* ---------- 04 命令栏（站点头部） ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--blue-900);
  color:#fff;
  border-bottom:1px solid rgba(220,232,244,.16);
}
.site-header__shell{
  display:flex;
  align-items:center;
  gap:20px;
  min-height:var(--header-h);
}

.brand-lockup{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  color:#fff;
  text-decoration:none;
}
.brand-mark{
  flex:0 0 30px;
  width:30px;height:30px;
  display:grid;place-items:center;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(220,232,244,.28);
  border-bottom:2px solid var(--brass-600);
  border-radius:var(--r-sm);
  font-family:var(--font-display);
  font-size:var(--t-14);
  font-weight:700;
  line-height:1;
  transition:background-color var(--fast),border-color var(--fast);
}
.brand-lockup:hover .brand-mark{
  background:var(--blue-700);
  border-color:rgba(243,230,201,.7);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{
  font-family:var(--font-display);
  font-size:1.0625rem;
  font-weight:700;
  letter-spacing:.04em;
  color:#fff;
}
.brand-sub{
  margin-top:2px;
  font-size:var(--t-12);
  letter-spacing:.12em;
  color:rgba(220,232,244,.68);
}

.cmd-nav{margin-left:auto;}
.cmd-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.cmd-nav__item{display:block;}
.cmd-nav__link{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 10px;
  color:rgba(220,232,244,.8);
  font-size:var(--t-14);
  line-height:1.5;
  border-bottom:2px solid transparent;
  transition:color var(--fast),background-color var(--fast),border-color var(--fast);
}
.cmd-nav__link:hover{
  color:#fff;
  background:rgba(255,255,255,.07);
}
.cmd-nav__num{
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.06em;
  color:rgba(168,123,47,.95);
  transition:color var(--fast);
}
.cmd-nav__link:hover .cmd-nav__num{color:var(--brass-100);}
.cmd-nav__link[aria-current="page"]{
  color:#fff;
  border-bottom-color:var(--brass-600);
  background:rgba(255,255,255,.05);
}
.cmd-nav__link[aria-current="page"] .cmd-nav__num{color:var(--brass-100);}

.cmd-utility{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.cmd-cta{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:7px 14px;
  background:var(--blue-700);
  color:#fff;
  font-size:var(--t-14);
  font-weight:500;
  letter-spacing:.02em;
  line-height:1.4;
  border:1px solid rgba(220,232,244,.26);
  border-radius:var(--r-sm);
  transition:background-color var(--fast),border-color var(--fast);
}
.cmd-cta::before{
  content:"";
  width:6px;height:6px;
  flex:0 0 6px;
  background:var(--brass-100);
  border-radius:1px;
  transform:rotate(45deg);
}
.cmd-cta:hover{
  background:var(--blue-500);
  border-color:rgba(255,255,255,.55);
}

.version-pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  margin:0;
  padding:5px 11px;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(220,232,244,.2);
  border-radius:var(--r-pill);
  color:rgba(220,232,244,.9);
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.04em;
  line-height:1.5;
  white-space:nowrap;
  cursor:help;
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.version-pill__dot{
  width:6px;height:6px;
  flex:0 0 6px;
  border-radius:50%;
  background:var(--celadon-200);
  box-shadow:0 0 0 3px rgba(210,228,220,.16);
}
.version-pill__sep{color:rgba(220,232,244,.4);}
.version-pill__meta{color:rgba(220,232,244,.72);}

.nav-toggle{
  display:none;
  align-items:center;
  justify-content:center;
  width:38px;height:34px;
  padding:0;
  background:rgba(255,255,255,.06);
  color:#fff;
  border:1px solid rgba(220,232,244,.28);
  border-radius:var(--r-sm);
  cursor:pointer;
  transition:background-color var(--fast),border-color var(--fast);
}
.nav-toggle:hover{
  background:rgba(255,255,255,.14);
  border-color:rgba(255,255,255,.5);
}
.nav-toggle__bars{display:grid;gap:4px;width:16px;}
.nav-toggle__bars i{
  display:block;
  height:1.5px;
  background:currentColor;
  border-radius:1px;
  transition:transform var(--base),opacity var(--fast);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) 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(-5.5px) rotate(-45deg);}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(220,232,244,.12);
  overflow:hidden;
}
.scroll-progress__fill{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--celadon-600),var(--celadon-200) 55%,var(--brass-600));
  transition:width 90ms linear;
}

/* ---------- 05 站点页脚 ---------- */
.site-footer{
  margin-top:88px;
  background:var(--blue-900);
  color:rgba(220,232,244,.86);
  font-size:var(--t-14);
  line-height:1.7;
}

.foot-bar{
  background:var(--brass-100);
  color:#3A2E12;
  border-bottom:1px solid rgba(168,123,47,.4);
}
.foot-bar__shell{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 16px;
  min-height:44px;
  padding-top:10px;
  padding-bottom:10px;
}
.foot-bar__label{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-size:var(--t-14);
  font-weight:500;
  letter-spacing:.06em;
}
.foot-bar__tick{
  display:block;
  width:14px;height:2px;
  background:var(--brass-600);
}
.foot-bar__value{
  margin:0;
  font-size:var(--t-14);
  color:#241C08;
  cursor:help;
  border-bottom:1px dashed rgba(110,79,22,.5);
}
.foot-bar__hint{
  margin:0 0 0 auto;
  font-size:var(--t-12);
  color:rgba(58,46,18,.78);
  opacity:0;
  transition:opacity var(--fast);
}
.foot-bar__shell:hover .foot-bar__hint,
.foot-bar__shell:focus-within .foot-bar__hint{opacity:1;}

.foot-main{
  display:grid;
  grid-template-columns:minmax(240px,1.1fr) minmax(0,1.5fr);
  gap:48px;
  padding-top:48px;
  padding-bottom:36px;
}
.foot-brand__mark{
  font-family:var(--font-display);
  font-size:var(--t-24);
  font-weight:700;
  letter-spacing:.06em;
  color:#fff;
  line-height:1.3;
}
.foot-brand__line{
  margin-top:6px;
  font-size:var(--t-12);
  letter-spacing:.14em;
  color:rgba(220,232,244,.66);
}
.foot-brand__note{
  margin-top:16px;
  max-width:36ch;
  font-size:var(--t-14);
  line-height:1.8;
  color:rgba(220,232,244,.84);
}
.foot-cta{margin-top:20px;}

.foot-cols{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:32px;
}
.foot-col__title{
  margin:0 0 14px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  font-weight:500;
  letter-spacing:.18em;
  color:var(--brass-100);
  border-bottom:1px solid rgba(220,232,244,.18);
}
.foot-links{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:10px;
  counter-reset:footlink;
}
.foot-links li{
  counter-increment:footlink;
  display:flex;
  align-items:baseline;
}
.foot-links li::before{
  content:counter(footlink,decimal-leading-zero);
  flex:0 0 auto;
  margin-right:10px;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  color:rgba(243,230,201,.62);
}
.foot-links a{
  color:rgba(220,232,244,.86);
  border-bottom:1px solid transparent;
  transition:color var(--fast),border-color var(--fast);
}
.foot-links a:hover,
.foot-links a:focus-visible{
  color:#fff;
  border-bottom-color:var(--celadon-200);
}

.foot-meta{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 20px;
  padding-top:18px;
  padding-bottom:24px;
  border-top:1px solid rgba(220,232,244,.16);
  font-size:var(--t-14);
}
.foot-contact{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px 10px;
  margin:0;
  color:rgba(220,232,244,.88);
}
.foot-contact__item{font-size:var(--t-14);}
.foot-contact__sep{color:rgba(220,232,244,.32);}
.foot-hours{margin:0;color:rgba(220,232,244,.6);}
.foot-legal{
  margin:0 0 0 auto;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.02em;
  color:rgba(220,232,244,.6);
}

.copy-btn{
  padding:6px 13px;
  background:transparent;
  color:rgba(220,232,244,.9);
  font-size:var(--t-12);
  line-height:1.5;
  border:1px solid rgba(220,232,244,.34);
  border-radius:var(--r-pill);
  cursor:pointer;
  transition:background-color var(--fast),border-color var(--fast),color var(--fast);
}
.copy-btn:hover{
  background:rgba(255,255,255,.1);
  border-color:rgba(255,255,255,.6);
  color:#fff;
}
.copy-btn[data-copied]{
  background:var(--celadon-600);
  border-color:var(--celadon-600);
  color:#fff;
}

/* ---------- 06 通用排版与区块 ---------- */
.section{padding:56px 0;}
.section--tight{padding:32px 0;}
.section--band{
  background:var(--gray-50);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:12px 24px;
  margin-bottom:24px;
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}
.eyebrow{
  margin:0 0 8px;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.18em;
  color:var(--brass-ink);
}
.display{
  margin:0;
  font-family:var(--font-display);
  font-size:clamp(1.75rem,3.4vw,2.75rem);
  font-weight:700;
  line-height:1.3;
  letter-spacing:-.01em;
  color:var(--ink);
}
.display--sm{
  font-size:clamp(1.375rem,2.4vw,1.75rem);
  font-weight:600;
}
.lede{
  max-width:62ch;
  font-size:1.0625rem;
  line-height:1.85;
  color:var(--gray-700);
}

.prose{
  max-width:70ch;
  font-size:var(--t-16);
  line-height:1.85;
  color:var(--gray-700);
}
.prose h2{
  margin:40px 0 12px;
  font-family:var(--font-display);
  font-size:var(--t-24);
  line-height:1.4;
  color:var(--ink);
}
.prose h3{
  margin:28px 0 8px;
  font-size:1.0625rem;
  font-weight:700;
  color:var(--ink);
}
.prose p{margin:0 0 16px;}
.prose ul,.prose ol{margin:0 0 16px;padding-left:1.35rem;}
.prose li{margin-bottom:6px;}
.prose a{
  color:var(--blue-700);
  border-bottom:1px solid var(--blue-500);
  transition:color var(--fast),border-color var(--fast);
}
.prose a:hover{color:var(--blue-500);border-bottom-color:var(--blue-700);}
.prose code{
  font-family:var(--font-mono);
  font-size:.875em;
  padding:2px 6px;
  background:var(--blue-100);
  color:var(--blue-900);
  border-radius:var(--r-sm);
}

/* ---------- 07 区块组件（Bento / 展签 / 索引） ---------- */
.panel{
  position:relative;
  padding:24px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.panel--glass{
  background:rgba(251,250,247,.74);
  border-color:rgba(226,222,214,.72);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.panel--blue{background:var(--blue-100);border-color:var(--line-blue);}
.panel--celadon{background:var(--celadon-200);border-color:var(--line-celadon);}
.panel--brass{background:var(--brass-100);border-color:var(--line-brass);}
.panel--ink{
  background:var(--blue-900);
  border-color:var(--blue-900);
  color:rgba(220,232,244,.88);
}
.panel--interactive{
  display:block;
  color:inherit;
  transition:border-color var(--base),transform var(--base),background-color var(--base);
}
.panel--interactive:hover{
  border-color:var(--blue-500);
  transform:translateX(2px);
}
.panel--interactive:focus-visible{
  border-color:var(--blue-500);
  transform:translateX(2px);
}
.panel__index{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.16em;
  color:var(--brass-ink);
}
.panel__title{
  margin:0 0 8px;
  font-family:var(--font-display);
  font-size:var(--t-20);
  font-weight:600;
  line-height:1.4;
  color:var(--ink);
}
.panel__text{
  margin:0;
  font-size:.9375rem;
  line-height:1.8;
}
.panel--ink .panel__title,
.panel--ink .panel__index,
.panel--ink .panel__text{color:#fff;}
.panel--ink .panel__text{color:rgba(220,232,244,.86);}
.panel--ink .panel__index{color:var(--brass-100);}

.exhibit{
  display:grid;
  gap:4px;
  padding-left:12px;
  border-left:2px solid var(--brass-600);
}
.exhibit__label{
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.14em;
  color:var(--gray-700);
}
.exhibit__value{
  font-family:var(--font-display);
  font-size:1.125rem;
  font-weight:600;
  line-height:1.4;
  color:var(--ink);
}

.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  background:var(--blue-100);
  color:var(--blue-700);
  border:1px solid var(--line-blue);
  border-radius:var(--r-pill);
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.06em;
  line-height:1.6;
}
.badge--celadon{background:var(--celadon-200);color:#24513F;border-color:var(--line-celadon);}
.badge--brass{background:var(--brass-100);color:var(--brass-ink);border-color:var(--line-brass);}

.index-list{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--line);
}
.index-list__item{
  display:grid;
  grid-template-columns:56px minmax(0,1fr) auto;
  gap:12px;
  align-items:baseline;
  padding:14px 6px;
  color:inherit;
  border-bottom:1px solid var(--line);
  transition:background-color var(--fast),padding-left var(--fast);
}
a.index-list__item:hover{
  background:var(--gray-50);
  padding-left:10px;
}
.index-list__num{
  font-family:var(--font-mono);
  font-size:var(--t-12);
  color:var(--brass-ink);
}
.index-list__title{
  font-size:var(--t-16);
  font-weight:500;
  color:var(--ink);
}
.index-list__meta{
  font-family:var(--font-mono);
  font-size:var(--t-12);
  color:var(--gray-700);
  white-space:nowrap;
}

.rail{
  position:sticky;
  top:calc(var(--header-h) + 24px);
  align-self:start;
  padding:16px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.rail__title{
  margin:0 0 12px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.18em;
  color:var(--brass-ink);
  border-bottom:1px solid var(--line);
}
.rail__list{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}
.rail__link{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:8px;
  align-items:baseline;
  padding:8px 10px;
  color:var(--gray-700);
  font-size:var(--t-14);
  line-height:1.6;
  border-left:2px solid transparent;
  border-radius:0 var(--r-sm) var(--r-sm) 0;
  transition:background-color var(--fast),color var(--fast),border-color var(--fast);
}
.rail__link:hover{background:var(--gray-50);color:var(--blue-700);}
.rail__link[aria-current="true"]{
  background:var(--blue-100);
  color:var(--blue-900);
  border-left-color:var(--blue-700);
  font-weight:500;
}
.rail__num{
  font-family:var(--font-mono);
  font-size:var(--t-12);
  color:var(--brass-ink);
}

.fold{
  margin-bottom:12px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
}
.fold > summary{
  display:flex;
  align-items:center;
  gap:12px;
  padding:16px 20px;
  color:var(--ink);
  font-weight:500;
  cursor:pointer;
  list-style:none;
  transition:background-color var(--fast);
}
.fold > summary::-webkit-details-marker{display:none;}
.fold > summary::before{
  content:"";
  flex:0 0 8px;
  width:8px;height:8px;
  border-right:1.5px solid var(--blue-700);
  border-bottom:1.5px solid var(--blue-700);
  transform:rotate(-45deg);
  transition:transform var(--base);
}
.fold[open] > summary::before{transform:rotate(45deg);}
.fold > summary:hover{background:var(--gray-50);}
.fold__body{
  padding:0 20px 18px;
  border-top:1px solid var(--line);
  font-size:.9375rem;
  line-height:1.85;
}

.ledger-wrap{
  width:100%;
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.ledger{
  width:100%;
  min-width:520px;
  border-collapse:collapse;
  font-size:var(--t-14);
}
.ledger th,
.ledger td{
  padding:10px 14px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.ledger th{
  background:var(--gray-50);
  font-family:var(--font-mono);
  font-size:var(--t-12);
  font-weight:500;
  letter-spacing:.1em;
  color:var(--gray-700);
  white-space:nowrap;
}
.ledger td{color:var(--ink);}
.ledger tbody tr:hover td{background:var(--gray-50);}
.ledger tbody tr:last-child td{border-bottom:0;}

/* ---------- 08 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  font-family:var(--font-ui);
  font-size:.9375rem;
  font-weight:500;
  line-height:1.2;
  text-decoration:none;
  border:1px solid transparent;
  border-radius:var(--r-sm);
  cursor:pointer;
  transition:background-color var(--fast),color var(--fast),border-color var(--fast);
}
.btn--primary{background:var(--blue-700);color:#fff;border-color:var(--blue-700);}
.btn--primary:hover{background:var(--blue-500);border-color:var(--blue-500);}
.btn--ghost{background:transparent;color:var(--blue-900);border-color:var(--line-strong);}
.btn--ghost:hover{background:var(--blue-100);border-color:var(--blue-500);color:var(--blue-700);}
.btn--quiet{background:var(--gray-50);color:var(--gray-700);border-color:var(--line);}
.btn--quiet:hover{background:var(--gray-200);color:var(--ink);}
.btn--on-dark{background:transparent;color:#fff;border-color:rgba(220,232,244,.4);}
.btn--on-dark:hover{background:rgba(255,255,255,.12);border-color:#fff;}

/* ---------- 09 面包屑 ---------- */
.crumbs{padding-top:20px;}
.crumbs__list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-size:var(--t-14);
}
.crumbs__item{display:inline-flex;align-items:center;gap:8px;}
.crumbs__link{
  color:var(--gray-700);
  border-bottom:1px solid var(--line);
  transition:color var(--fast),border-color var(--fast);
}
.crumbs__link:hover{color:var(--blue-700);border-bottom-color:var(--blue-500);}
.crumbs__sep{color:var(--line-strong);}
.crumbs__current{color:var(--ink);font-weight:500;}

/* ---------- 10 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--gray-50);
  border:1px solid var(--line);
  border-radius:var(--r-md);
}
.media__frame{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media--16x9{aspect-ratio:16 / 9;}
.media--4x3{aspect-ratio:4 / 3;}
.media--3x2{aspect-ratio:3 / 2;}
.media--1x1{aspect-ratio:1 / 1;}
.media--auto{aspect-ratio:auto;}
.media--plate{
  background-color:var(--gray-50);
  background-image:
    linear-gradient(0deg,rgba(22,67,110,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(22,67,110,.08) 1px,transparent 1px),
    linear-gradient(135deg,rgba(220,232,244,.9),rgba(242,240,235,.6) 55%,rgba(210,228,220,.7));
  background-size:24px 24px,24px 24px,100% 100%;
}
.media__tag{
  position:absolute;
  left:12px;
  top:12px;
  padding:3px 10px;
  background:rgba(251,250,247,.86);
  color:var(--blue-900);
  border:1px solid var(--line-brass);
  border-radius:var(--r-sm);
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.08em;
  backdrop-filter:blur(6px);
  -webkit-backdrop-filter:blur(6px);
}
.media__stamp{
  position:absolute;
  right:12px;
  bottom:12px;
  padding:3px 10px;
  background:rgba(14,42,71,.82);
  color:#fff;
  border-radius:var(--r-sm);
  font-family:var(--font-mono);
  font-size:var(--t-12);
  letter-spacing:.06em;
}
.media__caption{
  margin-top:10px;
  font-size:var(--t-12);
  letter-spacing:.04em;
  color:var(--gray-700);
}

/* ---------- 11 锚点高亮 ---------- */
@keyframes axTargetFlash{
  0%{box-shadow:inset 3px 0 0 0 var(--brass-600);background-color:rgba(243,230,201,.5);}
  100%{box-shadow:inset 3px 0 0 0 rgba(168,123,47,0);background-color:transparent;}
}
.is-flash{animation:axTargetFlash 1200ms ease-out 1;}

/* ---------- 12 响应式 ---------- */
@media (max-width:1120px){
  .cmd-nav__link{padding:8px 7px;gap:5px;}
  .cmd-nav__link{font-size:.8125rem;}
}

@media (max-width:1024px){
  .site-header__shell{gap:12px;}
  .cmd-utility{margin-left:auto;}
  .brand-sub{display:none;}
  .nav-toggle{display:inline-flex;}

  .cmd-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    right:0;
    display:none;
    margin:0;
    padding:8px 16px 20px;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    background:var(--blue-900);
    border-bottom:1px solid rgba(220,232,244,.18);
    box-shadow:0 24px 40px rgba(14,42,71,.28);
  }
  .cmd-nav[data-open]{display:block;}
  .cmd-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .cmd-nav__link{
    display:flex;
    justify-content:flex-start;
    padding:14px 12px;
    font-size:var(--t-16);
    border-bottom:1px solid rgba(220,232,244,.14);
  }
  .cmd-nav__link[aria-current="page"]{
    background:rgba(255,255,255,.07);
    border-bottom-color:var(--brass-600);
  }
}

@media (max-width:900px){
  .dual{grid-template-columns:minmax(0,1fr);gap:24px;}
  .rail{position:static;top:auto;}

  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--bento{grid-template-columns:repeat(6,minmax(0,1fr));}
  .span-2,.span-3,.span-4,.span-5{grid-column:span 6;}
  .span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 6;}

  .foot-main{
    grid-template-columns:minmax(0,1fr);
    gap:32px;
    padding-top:36px;
    padding-bottom:28px;
  }
  .foot-legal{margin-left:0;}
  .foot-bar__hint{margin-left:0;opacity:1;}
  .foot-bar__value{cursor:default;border-bottom:0;}
}

@media (max-width:640px){
  :root{--gutter:16px;}
  .section{padding:40px 0;}
  .grid{gap:12px;}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr);}
  .grid--bento{grid-template-columns:minmax(0,1fr);}
  .span-2,.span-3,.span-4,.span-5,.span-6,
  .span-7,.span-8,.span-9,.span-12{grid-column:span 1;}
  .panel{padding:20px;}
  .index-list__item{grid-template-columns:44px minmax(0,1fr);row-gap:4px;}
  .index-list__meta{grid-column:2;}

  .foot-cols{grid-template-columns:minmax(0,1fr);gap:24px;}
  .foot-contact__sep{display:none;}
  .foot-contact__item{white-space:normal;}
  .foot-meta{gap:10px 12px;}
  .display{font-size:clamp(1.5rem,6vw,2rem);}
}

@media (max-width:560px){
  .cmd-cta{padding:7px 11px;font-size:var(--t-12);}
  .version-pill__meta,
  .version-pill__sep{display:none;}
}

@media (max-width:420px){
  .version-pill{display:none;}
}

/* ---------- 13 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .scroll-progress__fill{transition:none;}
  .panel--interactive:hover{transform:none;}
}