/* ==========================================================================
   半岛官网口 — 共享样式 /assets/site.css
   档案室 × 海图：深海墨蓝基底、等宽索引、有机色块与刻度线
   ========================================================================== */

*,*::before,*::after{box-sizing:border-box}

:root{
  --ink:#0A1B29;
  --tide:#123045;
  --deep:#1C4A63;
  --mist:#9FBFBF;
  --glow:#45E0CE;
  --coral:#FF6A45;
  --rock:#DCD8D0;
  --shell:#F4F1E9;
  --moss:#6B8570;
  --clay:#A08B78;

  --line:var(--deep);
  --line-soft:rgba(159,191,191,.18);

  --font-sans:"PingFang SC","Noto Sans SC","Source Han Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --wrap:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:18px;
  --radius-sm:10px;
  --ease:cubic-bezier(.4,0,.2,1);
}

html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  background-color:var(--ink);
}

body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  color:var(--shell);
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 520px at 84% -10%, rgba(69,224,206,.075), transparent 62%),
    radial-gradient(920px 480px at 2% 104%, rgba(160,139,120,.10), transparent 66%),
    repeating-linear-gradient(0deg, rgba(159,191,191,.04) 0 1px, transparent 1px 7px);
  background-attachment:scroll;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body,button,input,textarea,select{font-family:var(--font-sans)}

h1,h2,h3,h4,h5{margin:0;font-weight:700;line-height:1.25;letter-spacing:-.015em;color:var(--shell)}
h1{font-size:clamp(32px,4.6vw,56px);font-weight:800;letter-spacing:-.03em;line-height:1.1}
h2{font-size:clamp(22px,2.6vw,32px)}
h3{font-size:clamp(18px,2vw,22px)}
h4{font-size:17px}

p{margin:0 0 .9em}
p:last-child{margin-bottom:0}

ul,ol{margin:0;padding:0;list-style:none}

a{color:inherit;text-decoration:none}

img,svg,picture,video{display:block;max-width:100%}
img{height:auto}

button{font:inherit;color:inherit}

hr{border:0;border-top:1px solid var(--line);margin:0}

::selection{background:var(--glow);color:var(--ink)}

:focus-visible{
  outline:2px solid var(--glow);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- 工具与排版原子 ---------- */

.shell{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.mono{
  font-family:var(--font-mono);
  letter-spacing:.08em;
  font-variant-numeric:tabular-nums;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.65em;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--mist);
  margin:0 0 14px;
}
.eyebrow::before{
  content:"";
  width:22px;
  height:1px;
  background:var(--coral);
  flex:none;
}

.lede{
  font-size:clamp(17px,1.9vw,20px);
  line-height:1.7;
  color:var(--mist);
  max-width:60ch;
  margin:0 0 1.1em;
}

.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.8;
  color:var(--shell);
}
.prose p{margin:0 0 1.1em}
.prose p:last-child{margin-bottom:0}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin:1.9em 0 .6em}
.prose h3{font-size:19px;margin:1.6em 0 .5em;color:var(--mist)}
.prose ul,.prose ol{list-style:revert;padding-left:1.35em;margin:0 0 1.1em}
.prose li{margin:.35em 0}
.prose a{
  color:var(--glow);
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:.28em;
  text-decoration-color:rgba(69,224,206,.45);
}
.prose a:hover{text-decoration-color:var(--glow)}
.prose strong{color:var(--shell);font-weight:700}
.prose code{
  font-family:var(--font-mono);
  font-size:.88em;
  letter-spacing:.06em;
  color:var(--glow);
  background:rgba(69,224,206,.08);
  padding:.1em .42em;
  border-radius:4px;
}

/* ---------- 跳到主内容 ---------- */

.skip-link{
  position:fixed;
  top:0;
  left:50%;
  z-index:300;
  transform:translate(-50%,-130%);
  background:var(--glow);
  color:var(--ink);
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  padding:10px 20px;
  border-radius:0 0 12px 12px;
  transition:transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translate(-50%,0)}

/* ---------- 头部 ---------- */

.site-header{
  position:relative;
  z-index:80;
  background:linear-gradient(180deg, rgba(18,48,69,.94) 0%, rgba(10,27,41,.99) 100%);
  border-bottom:1px solid var(--deep);
}

.scroll-meter{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:150;
  background:rgba(159,191,191,.14);
  pointer-events:none;
}
.scroll-meter span{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--glow) 0%, var(--coral) 100%);
}

.header-rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding-block:9px;
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--mist);
  border-bottom:1px solid rgba(28,74,99,.7);
}

.rail-meta{
  display:flex;
  align-items:center;
  gap:10px;
  flex-wrap:wrap;
  margin:0;
  font-size:11.5px;
  color:var(--mist);
}
.rail-id{color:var(--shell);letter-spacing:.14em}
.rail-sep{color:var(--deep)}
.rail-note{color:var(--clay);letter-spacing:.08em}

.rail-right{display:flex;align-items:center;gap:12px;flex:none}

.status-pill{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 11px;
  border-radius:999px;
  border:1px solid rgba(255,106,69,.38);
  background:rgba(255,106,69,.07);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}

.status-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  flex:none;
  background:var(--coral);
  animation:tidePulse 2.4s ease-in-out infinite;
}
@keyframes tidePulse{
  0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(255,106,69,.5)}
  50%{opacity:.42;box-shadow:0 0 0 5px rgba(255,106,69,0)}
}

.drawer-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:7px 13px;
  border-radius:999px;
  border:1px solid var(--deep);
  background:transparent;
  color:var(--mist);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .18s var(--ease), color .18s var(--ease), background-color .18s var(--ease);
}
.drawer-toggle:hover,
.drawer-toggle[aria-expanded="true"]{
  border-color:var(--glow);
  color:var(--glow);
  background:rgba(69,224,206,.07);
}
.drawer-toggle-label{font-size:11px;letter-spacing:.18em}

.bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:15px;
  flex:none;
}
.bars i{
  display:block;
  height:1px;
  width:100%;
  background:currentColor;
  transition:width .2s var(--ease);
}
.drawer-toggle:hover .bars i:nth-child(2),
.nav-toggle:hover .bars i:nth-child(2){width:62%}
.drawer-toggle[aria-expanded="true"] .bars i:nth-child(2),
.nav-toggle[aria-expanded="true"] .bars i:nth-child(2){width:62%}

.masthead-bar{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;
  gap:20px;
  padding-block:clamp(14px,2.4vw,26px) clamp(16px,2.6vw,28px);
}
.masthead-bar::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:7px;
  background-image:repeating-linear-gradient(90deg, rgba(159,191,191,.34) 0 1px, transparent 1px 30px);
  opacity:.65;
  pointer-events:none;
}

.masthead-side{
  display:flex;
  align-items:center;
  gap:10px;
  min-width:0;
  margin:0;
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--mist);
}
.masthead-side--start{justify-content:flex-start}
.masthead-side--end{justify-content:flex-end}
.masthead-side .mono{font-size:10.5px;letter-spacing:.16em;color:var(--mist)}
.side-note{
  font-size:10.5px;
  letter-spacing:.16em;
  color:var(--clay);
  white-space:nowrap;
}

.wordmark{
  display:block;
  justify-self:center;
  text-align:center;
  color:var(--shell);
  text-decoration:none;
  transition:color .2s var(--ease);
}
.wordmark-text{
  display:block;
  font-size:clamp(30px,5.2vw,58px);
  font-weight:800;
  line-height:1.04;
  letter-spacing:-.03em;
  font-stretch:90%;
}
.wordmark-sub{
  display:block;
  margin-top:9px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.24em;
  color:var(--mist);
  transition:color .2s var(--ease);
}
.wordmark:hover .wordmark-text{color:#FFFFFF}
.wordmark:hover .wordmark-sub{color:var(--glow)}

.masthead-navrow{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  border-bottom:1px solid var(--deep);
}

.masthead-nav{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(14px,3vw,40px);
  width:100%;
  padding:11px 0;
}

.nav-link{
  position:relative;
  display:inline-block;
  padding:7px 2px;
  color:var(--shell);
  font-size:14px;
  letter-spacing:.06em;
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:1px;
  height:2px;
  background:var(--glow);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--glow)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--glow)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-toggle{display:none}
.nav-toggle-text{font-size:12px;letter-spacing:.18em}

.header-note{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:flex-end;
  gap:6px 22px;
  margin:0;
  padding-block:9px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--clay);
  border-bottom:1px solid rgba(28,74,99,.7);
}
.header-note span{display:inline-flex;align-items:center;gap:8px}
.header-note span::before{
  content:"";
  width:5px;
  height:5px;
  flex:none;
  background:var(--deep);
}
.header-note span:first-child::before{background:var(--coral)}

/* ---------- 索引抽屉 ---------- */

.drawer-scrim{
  position:fixed;
  inset:0;
  z-index:155;
  background:rgba(4,12,18,.62);
  opacity:0;
  visibility:hidden;
  transition:opacity .26s var(--ease), visibility .26s var(--ease);
}
.drawer-scrim[data-open="true"]{opacity:1;visibility:visible}

.index-drawer{
  position:fixed;
  top:0;
  right:0;
  bottom:0;
  z-index:160;
  width:min(380px,92vw);
  display:flex;
  flex-direction:column;
  background:var(--tide);
  border-left:1px solid var(--deep);
  box-shadow:-26px 0 60px rgba(0,0,0,.5);
  overflow-y:auto;
  overscroll-behavior:contain;
  transform:translateX(102%);
  visibility:hidden;
  transition:transform .28s var(--ease), visibility .28s var(--ease);
}
.index-drawer[data-open="true"]{transform:none;visibility:visible}
.index-drawer:focus{outline:none}

.drawer-head{
  position:sticky;
  top:0;
  z-index:2;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:18px 22px;
  background:var(--tide);
  border-bottom:1px solid var(--deep);
}
.drawer-kicker{
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--mist);
}
.drawer-close{
  padding:6px 13px;
  border-radius:999px;
  border:1px solid var(--deep);
  background:transparent;
  color:var(--mist);
  font-size:11px;
  letter-spacing:.14em;
  cursor:pointer;
  transition:border-color .18s var(--ease), color .18s var(--ease);
}
.drawer-close:hover{border-color:var(--glow);color:var(--glow)}

.drawer-body{
  display:grid;
  gap:30px;
  padding:22px 22px 44px;
}

.drawer-section{margin:0}

.drawer-label{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--clay);
}

.drawer-list{display:grid;gap:2px;margin:0;padding:0;list-style:none}

.drawer-link{
  display:flex;
  align-items:baseline;
  gap:12px;
  padding:9px 9px;
  border-radius:8px;
  color:var(--shell);
  font-size:14px;
  transition:background-color .16s var(--ease), color .16s var(--ease);
}
.drawer-link .mono{font-size:10.5px;letter-spacing:.14em;color:var(--moss);flex:none}
.drawer-link:hover{background:var(--deep);color:#FFFFFF}
.drawer-link:hover .mono{color:var(--glow)}
.drawer-link[aria-current="page"]{color:var(--glow)}
.drawer-link[aria-current="page"] .mono{color:var(--glow)}
.drawer-link.is-active{background:rgba(69,224,206,.1);color:var(--glow)}
.drawer-link.is-active .mono{color:var(--glow)}

.drawer-note{
  margin:0 0 14px;
  font-size:12.5px;
  line-height:1.7;
  color:var(--mist);
}

.drawer-empty{
  padding:10px 12px;
  border:1px dashed rgba(28,74,99,.95);
  border-radius:8px;
  font-size:12.5px;
  line-height:1.7;
  color:var(--clay);
}

html.drawer-open{overflow:hidden}

/* ---------- 页脚 ---------- */

.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  background-color:var(--ink);
  border-top:1px solid var(--deep);
  color:var(--shell);
}

.footer-rule{
  height:7px;
  border-bottom:1px solid rgba(28,74,99,.65);
  background-image:repeating-linear-gradient(90deg, rgba(159,191,191,.28) 0 1px, transparent 1px 34px);
  opacity:.7;
}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,1fr) minmax(0,1.15fr);
  gap:clamp(26px,4vw,56px);
  padding-block:clamp(32px,4.6vw,60px) clamp(26px,3.4vw,44px);
}

.footer-brand,.footer-index,.footer-contact{min-width:0}

.footer-mark{
  margin:0 0 12px;
  font-size:clamp(24px,2.8vw,32px);
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--shell);
  line-height:1.15;
}
.footer-lead{
  margin:0 0 18px;
  max-width:34ch;
  font-size:14.5px;
  line-height:1.78;
  color:var(--mist);
}
.footer-code{
  margin:0;
  font-size:10.5px;
  letter-spacing:.18em;
  color:var(--clay);
}

.footer-col-title{
  margin:0 0 12px;
  padding-bottom:9px;
  border-bottom:1px solid rgba(28,74,99,.85);
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--mist);
}
.footer-col-title--sub{margin-top:24px}

.footer-links{display:grid;gap:1px;margin:0;padding:0;list-style:none}
.footer-links--inline{display:flex;flex-wrap:wrap;gap:4px 18px}

.footer-link{
  display:inline-block;
  padding:4px 0;
  color:var(--shell);
  font-size:14px;
  transition:color .18s var(--ease);
}
.footer-link:hover{color:var(--glow)}

.footer-contact-list{
  display:grid;
  gap:9px;
  margin:0 0 14px;
  padding:0;
  list-style:none;
  font-size:14px;
  color:var(--shell);
}
.footer-contact-list li{
  display:flex;
  align-items:baseline;
  gap:10px;
  flex-wrap:wrap;
  overflow-wrap:anywhere;
}
.footer-contact-list .mono{
  flex:none;
  min-width:42px;
  font-size:10px;
  letter-spacing:.16em;
  color:var(--clay);
}

.footer-note{
  margin:0 0 18px;
  max-width:32ch;
  font-size:12.5px;
  line-height:1.72;
  color:var(--mist);
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 24px;
  padding-block:16px 24px;
  border-top:1px solid rgba(28,74,99,.8);
}
.footer-legal,.footer-icp,.footer-version{
  margin:0;
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--mist);
}
.footer-version{color:var(--clay)}

/* ---------- 通用组件 ---------- */

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:.78em 1.4em;
  border-radius:999px;
  border:1px solid var(--deep);
  background:var(--tide);
  color:var(--shell);
  font-size:14px;
  letter-spacing:.06em;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}
.btn:hover{background:var(--deep);border-color:var(--glow);color:#FFFFFF}
.btn:active{transform:translateY(1px)}

.btn--accent{
  background:var(--coral);
  border-color:var(--coral);
  color:var(--ink);
  font-weight:700;
}
.btn--accent:hover{background:#FF8462;border-color:#FF8462;color:var(--ink)}

.btn--ghost{
  background:transparent;
  border-color:rgba(159,191,191,.45);
  color:var(--mist);
}
.btn--ghost:hover{background:rgba(69,224,206,.08);border-color:var(--glow);color:var(--glow)}

.btn--small{padding:.55em 1.05em;font-size:12.5px;letter-spacing:.1em}

.panel{
  padding:clamp(18px,2.4vw,30px);
  border:1px solid var(--deep);
  border-radius:var(--radius);
  background:var(--tide);
  transition:background-color .22s var(--ease), border-color .22s var(--ease);
}
.panel:hover{background:var(--deep);border-color:var(--mist)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:.45em;
  padding:3px 10px;
  border-radius:999px;
  border:1px solid var(--deep);
  background:rgba(18,48,69,.72);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--live{color:var(--coral);border-color:rgba(255,106,69,.42);background:rgba(255,106,69,.08)}
.tag--ok{color:var(--glow);border-color:rgba(69,224,206,.4);background:rgba(69,224,206,.08)}
.tag--moss{color:var(--shell);border-color:rgba(107,133,112,.55);background:rgba(107,133,112,.22)}

.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5em;
  margin:0 0 clamp(18px,3vw,30px);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mist);
}
.crumbs li{display:flex;align-items:center;gap:.5em}
.crumbs li + li::before{content:"／";color:var(--deep)}
.crumbs a{color:var(--mist);transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--glow)}
.crumbs [aria-current="page"]{color:var(--shell)}

.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid--bento{grid-template-columns:repeat(12,minmax(0,1fr))}

/* 图片容器基础规则（页面阶段直接放占位或真实图） */
.media-frame{
  position:relative;
  isolation:isolate;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--deep);
  border-radius:var(--radius);
  background:linear-gradient(155deg,var(--tide) 0%, var(--ink) 100%);
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture,
.media-frame > video{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  z-index:2;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg, rgba(159,191,191,.1) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(159,191,191,.07) 0 1px, transparent 1px 72px);
  mix-blend-mode:screen;
}
.media-frame::after{
  content:"";
  position:absolute;
  left:14px;
  bottom:12px;
  z-index:2;
  width:26px;
  height:26px;
  border-left:1px solid var(--mist);
  border-bottom:1px solid var(--mist);
  opacity:.6;
  pointer-events:none;
}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--21x9{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}

.media-caption{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--mist);
}

/* 编号章节 */
[data-chapter]{scroll-margin-top:96px}

.chapter-head{
  display:flex;
  align-items:baseline;
  gap:clamp(12px,2vw,22px);
  margin-bottom:clamp(14px,2vw,22px);
  padding-bottom:12px;
  border-bottom:1px solid var(--deep);
}
.chapter-no{
  font-family:var(--font-mono);
  font-size:clamp(26px,3.4vw,40px);
  font-weight:500;
  letter-spacing:.04em;
  line-height:1;
  color:var(--glow);
}
.chapter-title{
  font-size:clamp(20px,2.4vw,28px);
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--shell);
}
.chapter-aside{
  margin-left:auto;
  text-align:right;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--clay);
}

/* ---------- 平板 ---------- */

@media (max-width:1080px){
  .masthead-bar{gap:14px}
  .footer-grid{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1fr)}
}

@media (max-width:900px){
  .header-rail{font-size:11px}
  .rail-note{display:none}
  .masthead-side .mono{font-size:10px}
  .side-note{display:none}

  .masthead-navrow{justify-content:space-between;padding-block:8px;border-bottom:1px solid var(--deep)}

  .nav-toggle{
    display:inline-flex;
    align-items:center;
    gap:10px;
    padding:8px 14px;
    border-radius:999px;
    border:1px solid var(--deep);
    background:transparent;
    color:var(--shell);
    font-size:12px;
    letter-spacing:.18em;
    cursor:pointer;
    transition:border-color .18s var(--ease), color .18s var(--ease);
  }
  .nav-toggle:hover,
  .nav-toggle[aria-expanded="true"]{border-color:var(--glow);color:var(--glow)}

  .masthead-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    z-index:70;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:6px var(--gutter) 20px;
    background:var(--tide);
    border-bottom:1px solid var(--deep);
    box-shadow:0 26px 52px rgba(0,0,0,.48);
    opacity:0;
    visibility:hidden;
    transform:translateY(-6px);
    transition:opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease);
  }
  .masthead-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}

  .masthead-nav .nav-link{
    display:block;
    padding:13px 4px;
    font-size:15px;
    border-bottom:1px solid rgba(159,191,191,.12);
  }
  .masthead-nav .nav-link::after{display:none}
  .masthead-nav .nav-link:hover{background:rgba(69,224,206,.07);color:var(--glow)}
  .masthead-nav .nav-link[aria-current="page"]{color:var(--glow)}

  .header-note{justify-content:flex-start;font-size:10px;gap:6px 16px}

  .footer-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px}
  .footer-brand{grid-column:1 / -1}
  .footer-lead{max-width:56ch}
  .footer-base{justify-content:flex-start}
}

/* ---------- 手机 ---------- */

@media (max-width:640px){
  .header-rail{padding-block:8px;gap:10px}
  .rail-meta{font-size:10px;gap:6px}
  .rail-id{letter-spacing:.1em}
  .status-pill{padding:4px 9px;font-size:9.5px;letter-spacing:.1em}
  .drawer-toggle{display:none}

  .masthead-bar{grid-template-columns:minmax(0,1fr);justify-items:center;gap:10px;padding-block:16px 20px}
  .masthead-side{justify-content:center;font-size:10px;letter-spacing:.14em}
  .masthead-side--start{order:2}
  .masthead-side--end{order:3}
  .wordmark-text{font-size:clamp(30px,10vw,44px)}
  .wordmark-sub{font-size:9.5px;letter-spacing:.18em}

  .header-note{font-size:9.5px;letter-spacing:.1em}
  .header-note span:last-child{display:none}

  .bento,.grid--bento{grid-template-columns:repeat(6,minmax(0,1fr))}

  .chapter-head{flex-wrap:wrap;gap:10px}
  .chapter-aside{width:100%;text-align:left;margin-left:0}

  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-base{flex-direction:column;align-items:flex-start;gap:6px}
  .index-drawer{width:min(340px,96vw)}
}

/* ---------- 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;
    scroll-behavior:auto !important;
  }
  .status-dot{animation:none;opacity:1}
  .masthead-nav,
  .index-drawer,
  .drawer-scrim,
  .skip-link{transition:none}
}