/* ============================================================
   奇迹电游 · 中文版 — 共享样式 /assets/site.css
   深夜信号台 / 堆叠面板 / 左侧框架式频道导轨
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --abyss:#04070F;
  --deep:#0A1730;
  --signal:#12294A;
  --line:#2C4A72;
  --cyan:#39E6D8;
  --orange:#FF7A33;
  --purple:#A96BFF;
  --amber:#F2C14E;
  --paper:#E9F2FB;
  --muted:#93A7C2;

  --font-title:"Barlow Condensed","Oswald","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  --rail-w:224px;
  --status-h:38px;
  --brand-h:60px;
  --header-h:98px;
  --gutter:20px;
  --ease:cubic-bezier(.22,.8,.3,1);
  --shadow-deep:0 26px 60px -42px rgba(0,0,0,.95);
}

@media (min-width:768px){ :root{ --gutter:32px; --brand-h:64px; --header-h:102px; } }
@media (min-width:1200px){ :root{ --gutter:48px; } }

/* ---------- 2. Reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--abyss);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.8;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(880px 520px at 82% -12%, rgba(57,230,216,.10), transparent 62%),
    radial-gradient(680px 460px at 4% 22%, rgba(169,107,255,.085), transparent 66%),
    linear-gradient(180deg, rgba(10,23,48,.9), rgba(4,7,15,1) 46%);
}
img,svg{ max-width:100%; height:auto; display:block; }
button{ font:inherit; color:inherit; }
ul,ol{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4,p{ margin:0; }
:focus-visible{ outline:2px solid var(--cyan); outline-offset:2px; border-radius:2px; }

/* ---------- 3. 排版 ---------- */
h1,h2,h3,h4,.font-title{
  font-family:var(--font-title);
  font-weight:700;
  line-height:1.18;
  letter-spacing:.012em;
}
h1{ font-size:clamp(30px,5vw,52px); }
h2{ font-size:clamp(23px,3.2vw,34px); }
h3{ font-size:clamp(18px,2.2vw,24px); }
h4{ font-size:clamp(16px,1.6vw,19px); }
p{ max-width:78ch; }
a{ color:var(--cyan); text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:3px; }
.mono{ font-family:var(--font-mono); letter-spacing:.1em; }
.prose{ max-width:78ch; font-size:16.5px; line-height:1.85; }
.prose > * + *{ margin-top:1em; }
.prose h2{ margin-top:2.2em; font-size:clamp(21px,2.8vw,29px); }
.prose h3{ margin-top:1.8em; }
.prose ul,.prose ol{ padding-left:1.35em; list-style:disc; }
.prose ol{ list-style:decimal; }
.prose li{ margin-top:.45em; }
.prose strong{ color:var(--cyan); font-weight:600; }
.prose blockquote{
  border-left:2px solid var(--purple);
  padding:10px 0 10px 18px;
  color:var(--muted);
  margin-left:0;
}

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:#03110F;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{ transform:translateY(0); text-decoration:none; }

/* ---------- 5. 滚动进度 ---------- */
.scroll-progress{
  position:fixed;
  top:0; left:0;
  width:100%;
  height:2px;
  z-index:150;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--purple) 55%,var(--orange));
  pointer-events:none;
}

/* ---------- 6. Header 外壳 ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:80;
  display:flex;
  flex-direction:column;
}
.site-header a{ text-decoration:none; }

/* 呼号状态条 */
.statusbar{
  height:var(--status-h);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:0 var(--gutter);
  background:#02040A;
  border-bottom:1px solid rgba(44,74,114,.65);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--muted);
  white-space:nowrap;
  overflow:hidden;
}
.statusbar__greet{ color:var(--cyan); flex:0 1 auto; overflow:hidden; text-overflow:ellipsis; }
.statusbar__live{ display:flex; align-items:center; gap:8px; margin-left:auto; flex:0 0 auto; }
.statusbar__chan{ color:var(--paper); font-size:10.5px; }
.statusbar__word{ display:none; }
.statusbar__meta{ display:none; }
.statusbar__link{
  color:var(--orange);
  border-bottom:1px solid rgba(255,122,51,.4);
  padding-bottom:1px;
}
.statusbar__link:hover{ color:#FFB183; }
@media (min-width:640px){ .statusbar__word{ display:inline; } }
@media (min-width:880px){
  .statusbar__meta{ display:flex; align-items:center; gap:14px; margin-left:0; }
  .statusbar__live{ margin-left:0; }
  .statusbar{ justify-content:space-between; }
  .statusbar__greet{ color:var(--cyan); }
}

.status-dot{
  width:8px; height:8px;
  border-radius:50%;
  background:var(--cyan);
  flex:0 0 auto;
  animation:breathe 2.4s ease-in-out infinite;
}
@keyframes breathe{
  0%,100%{ opacity:1; box-shadow:0 0 0 0 rgba(57,230,216,.5), 0 0 12px rgba(57,230,216,.85); }
  50%{ opacity:.45; box-shadow:0 0 0 7px rgba(57,230,216,0), 0 0 4px rgba(57,230,216,.3); }
}

/* 品牌行 */
.brandline{
  position:relative;
  height:var(--brand-h);
  display:flex;
  align-items:center;
  gap:16px;
  padding:0 var(--gutter);
  background:rgba(4,7,15,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.brandline::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-1px;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(57,230,216,.7),transparent);
  opacity:.5;
  pointer-events:none;
}
.brandline__actions{ display:flex; align-items:center; gap:10px; margin-left:auto; }
.brandline__cta{ display:none; }
@media (min-width:600px){ .brandline__cta{ display:inline-flex; } }

.brand{ display:inline-flex; align-items:center; gap:12px; color:var(--paper); }
.brand:hover{ text-decoration:none; }
.brand__mark{ position:relative; width:34px; height:34px; flex:0 0 auto; display:inline-block; }
.brand__mark i{
  position:absolute;
  border:1px solid var(--cyan);
  border-radius:50%;
}
.brand__mark i:nth-child(1){ inset:0; opacity:.32; }
.brand__mark i:nth-child(2){ inset:7px; opacity:.6; }
.brand__mark i:nth-child(3){
  inset:14px;
  background:var(--orange);
  border-color:var(--orange);
  box-shadow:0 0 12px rgba(255,122,51,.85);
}
.brand__text{ display:flex; flex-direction:column; line-height:1.22; }
.brand__name{
  font-family:var(--font-title);
  font-size:19px;
  font-weight:700;
  letter-spacing:.07em;
  color:var(--paper);
}
.brand__sub{ font-size:9.5px; letter-spacing:.2em; color:var(--muted); }
.brand--footer{ margin-bottom:14px; }

/* 移动频道按钮 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  background:rgba(18,41,74,.7);
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{ border-color:var(--cyan); color:var(--cyan); background:rgba(18,41,74,.95); }
.nav-toggle__bars{ display:inline-flex; flex-direction:column; justify-content:center; gap:3px; width:16px; }
.nav-toggle__bars i{ display:block; height:2px; background:currentColor; transition:transform .24s var(--ease),opacity .24s var(--ease); }
.nav-toggle__bars i:nth-child(2){ width:70%; }
.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); }

/* 频道导轨 */
.rail{
  position:fixed;
  top:var(--header-h);
  left:0;
  bottom:0;
  width:var(--rail-w);
  z-index:70;
  display:flex;
  flex-direction:column;
  gap:18px;
  padding:28px 16px 24px;
  overflow-y:auto;
  background:linear-gradient(180deg,rgba(10,23,48,.94),rgba(4,7,15,.97));
  border-right:1px solid var(--line);
  backdrop-filter:blur(8px);
  -webkit-backdrop-filter:blur(8px);
  transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease);
}
.rail::before{
  content:"";
  position:absolute;
  top:0; bottom:0; left:0;
  width:1px;
  background:linear-gradient(180deg,transparent,rgba(57,230,216,.5),rgba(169,107,255,.35),transparent);
}
.rail::after{
  content:"";
  position:absolute;
  left:-1px;
  width:2px;
  height:120px;
  background:linear-gradient(180deg,transparent,var(--cyan),transparent);
  opacity:.55;
  animation:railtrace 6s linear infinite;
  pointer-events:none;
}
@keyframes railtrace{
  0%{ top:-140px; }
  100%{ top:100%; }
}
.rail__label{
  font-size:9.5px;
  letter-spacing:.24em;
  color:var(--muted);
  padding-left:12px;
  text-transform:uppercase;
}
.rail__list{ display:flex; flex-direction:column; gap:2px; }
.rail__link{
  display:flex;
  align-items:center;
  gap:12px;
  padding:11px 12px;
  color:var(--paper);
  font-size:15px;
  line-height:1.4;
  border-left:2px solid transparent;
  border-radius:0 2px 2px 0;
  transition:background .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}
.rail__link:hover{
  background:rgba(18,41,74,.85);
  border-left-color:var(--cyan);
  color:var(--cyan);
  transform:translateX(2px);
  text-decoration:none;
}
.rail__link[aria-current="page"]{
  background:rgba(18,41,74,.98);
  border-left-color:var(--orange);
  color:#FFFFFF;
}
.rail__link[aria-current="page"]::after{
  content:"";
  width:7px; height:7px;
  margin-left:auto;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 10px rgba(255,122,51,.95);
}
.rail__idx{ font-size:10.5px; color:var(--muted); }
.rail__link:hover .rail__idx,
.rail__link[aria-current="page"] .rail__idx{ color:var(--orange); }
.rail__foot{ margin-top:auto; padding:16px 12px 0; border-top:1px solid rgba(44,74,114,.6); }
.rail__note{ font-size:12px; line-height:1.7; color:var(--muted); max-width:100%; }
.rail__coord{ margin-top:8px; font-size:9.5px; letter-spacing:.2em; color:var(--cyan); }

@media (min-width:1024px){
  .nav-toggle{ display:none; }
}
@media (max-width:1023px){
  .rail{
    top:var(--header-h);
    left:0; right:0; bottom:auto;
    width:auto;
    max-height:calc(100vh - var(--header-h));
    padding:16px var(--gutter) 22px;
    border-right:0;
    border-bottom:1px solid var(--line);
    background:rgba(3,6,13,.985);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    pointer-events:none;
  }
  .rail::after{ display:none; }
  .rail[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
  .rail__label{ padding-left:0; }
  .rail__list{ gap:0; }
  .rail__link{
    padding:13px 4px;
    border-left:0;
    border-bottom:1px solid rgba(44,74,114,.45);
    border-radius:0;
    font-size:16px;
  }
  .rail__link:hover{ transform:none; }
  .rail__foot{ display:none; }
}

/* ---------- 7. 主内容容器 ---------- */
main,
#main-content{
  display:block;
  position:relative;
  z-index:1;
  padding:calc(var(--header-h) + 32px) var(--gutter) 88px;
}
@media (min-width:1024px){
  main,
  #main-content{
    padding-top:calc(var(--header-h) + 40px);
    padding-left:calc(var(--rail-w) + 40px);
    padding-right:clamp(24px,5vw,84px);
  }
}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:2px;
  background:transparent;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  line-height:1;
  letter-spacing:.04em;
  cursor:pointer;
  transition:background .22s var(--ease),border-color .22s var(--ease),color .22s var(--ease),transform .22s var(--ease),filter .22s var(--ease);
}
.btn:hover{ text-decoration:none; transform:translateY(-2px); }
.btn--primary{
  background:var(--orange);
  color:#120500;
  box-shadow:0 0 0 1px rgba(255,122,51,.35),0 14px 30px -18px rgba(255,122,51,.95);
}
.btn--primary:hover{ filter:brightness(1.08); }
.btn--ghost{
  background:rgba(18,41,74,.5);
  border-color:var(--line);
  color:var(--cyan);
}
.btn--ghost:hover{ border-color:var(--cyan); background:rgba(57,230,216,.1); }
.btn--sm{ padding:8px 14px; font-size:12.5px; }

/* ---------- 9. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--line);
  background:rgba(4,7,15,.55);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  text-transform:uppercase;
  line-height:1.6;
}
.tag--cyan{ color:var(--cyan); border-color:rgba(57,230,216,.5); }
.tag--orange{ color:var(--orange); border-color:rgba(255,122,51,.5); }
.tag--purple{ color:var(--purple); border-color:rgba(169,107,255,.5); }
.tag--amber{ color:var(--amber); border-color:rgba(242,193,78,.5); }

/* ---------- 10. 面板 ---------- */
.panel{
  position:relative;
  padding:28px 22px 30px;
  background:linear-gradient(180deg,rgba(10,23,48,.92),rgba(4,7,15,.88));
  border:1px solid var(--line);
  box-shadow:var(--shadow-deep);
}
.panel::before,
.panel::after{
  content:"";
  position:absolute;
  width:15px; height:15px;
  border:1px solid var(--cyan);
  opacity:.6;
  pointer-events:none;
}
.panel::before{ top:-1px; left:-1px; border-right:0; border-bottom:0; }
.panel::after{ bottom:-1px; right:-1px; border-left:0; border-top:0; }
.panel__coord{
  position:absolute;
  top:-1px; right:-1px;
  padding:4px 11px;
  background:var(--cyan);
  color:#03110F;
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.18em;
  line-height:1.6;
}
.panel__coord--orange{ background:var(--orange); color:#120500; }
.panel__coord--purple{ background:var(--purple); color:#12071F; }
.panel__coord--amber{ background:var(--amber); color:#1A1204; }
@media (min-width:768px){
  .panel{ padding:34px 34px 38px; }
}

/* ---------- 11. 网格 ---------- */
.grid{ display:grid; gap:18px; grid-template-columns:1fr; }
@media (min-width:640px){
  .grid--2,.grid--3,.grid--4{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (min-width:1024px){
  .grid--3{ grid-template-columns:repeat(3,minmax(0,1fr)); }
  .grid--4{ grid-template-columns:repeat(4,minmax(0,1fr)); }
}

/* ---------- 12. 卡片 ---------- */
.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:20px 18px 22px;
  background:rgba(18,41,74,.55);
  border:1px solid var(--line);
  border-left:3px solid var(--cyan);
  color:var(--paper);
  transition:background .24s var(--ease),border-color .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.card:hover{
  text-decoration:none;
  background:rgba(18,41,74,.95);
  border-left-color:var(--orange);
  transform:translateY(-2px);
  box-shadow:0 20px 44px -30px rgba(57,230,216,.85);
}
.card__coord{ font-family:var(--font-mono); font-size:10px; letter-spacing:.18em; color:var(--cyan); }
.card__title{ font-family:var(--font-title); font-size:20px; font-weight:700; line-height:1.28; }
.card__desc{ font-size:14px; line-height:1.72; color:var(--muted); }
.card__meta{ margin-top:auto; font-family:var(--font-mono); font-size:10.5px; letter-spacing:.12em; color:var(--muted); }

/* ---------- 13. 横向主题带 ---------- */
.band{
  position:relative;
  padding:26px var(--gutter);
  background:linear-gradient(90deg,rgba(18,41,74,.9),rgba(4,7,15,.55) 58%,rgba(169,107,255,.14));
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.band::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-1px;
  height:1px;
  background:repeating-linear-gradient(90deg,rgba(57,230,216,.4) 0 6px,transparent 6px 14px);
  opacity:.7;
  pointer-events:none;
}

/* ---------- 14. 信号轨道分隔线 ---------- */
.signal-rule{
  position:relative;
  height:1px;
  margin:40px 0 28px;
  background:var(--line);
}
.signal-rule::before{
  content:"";
  position:absolute;
  left:0; top:-1px;
  width:64px; height:3px;
  background:var(--cyan);
}
.signal-rule::after{
  content:attr(data-label);
  position:absolute;
  right:0; top:-11px;
  padding-left:12px;
  background:var(--abyss);
  color:var(--muted);
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.2em;
}

/* ---------- 15. 图片容器（页面阶段使用） ---------- */
.figure{
  position:relative;
  display:block;
  margin:0;
  border:1px solid var(--line);
  background:
    radial-gradient(420px 240px at 78% 12%,rgba(57,230,216,.14),transparent 68%),
    linear-gradient(150deg,#0A1730,#04070F 70%);
  overflow:hidden;
}
.figure__frame{
  position:relative;
  width:100%;
  display:block;
  overflow:hidden;
}
.figure__frame > img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) brightness(.94);
}
.figure--21x9 .figure__frame{ aspect-ratio:21/9; }
.figure--16x9 .figure__frame{ aspect-ratio:16/9; }
.figure--4x3 .figure__frame{ aspect-ratio:4/3; }
.figure--1x1 .figure__frame{ aspect-ratio:1/1; }
.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(233,242,251,.05) 0 1px,transparent 1px 3px);
  opacity:.55;
}
.figure__cap{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--muted);
}

/* ---------- 16. 面包屑 ---------- */
.breadcrumb{
  margin-bottom:22px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--muted);
}
.breadcrumb ol{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; }
.breadcrumb li{ display:inline-flex; align-items:center; }
.breadcrumb li + li::before{ content:"/"; margin-right:8px; color:var(--line); }
.breadcrumb a{ color:var(--muted); }
.breadcrumb a:hover{ color:var(--cyan); }
.breadcrumb [aria-current="page"]{ color:var(--cyan); }

/* ---------- 17. 条款式条目 ---------- */
.ledger{ border-top:1px solid var(--line); }
.ledger__row{
  display:grid;
  gap:6px;
  padding:16px 0;
  border-bottom:1px solid rgba(44,74,114,.55);
}
@media (min-width:768px){
  .ledger__row{ grid-template-columns:220px 1fr; gap:26px; align-items:start; }
}
.ledger__key{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.18em;
  color:var(--cyan);
  text-transform:uppercase;
}
.ledger__val{ font-size:15px; color:var(--paper); max-width:70ch; }

/* ---------- 18. 折叠面板 ---------- */
.fold{
  margin-top:12px;
  border:1px solid var(--line);
  background:rgba(4,7,15,.55);
}
.fold > summary{
  display:flex;
  align-items:center;
  gap:10px;
  padding:14px 18px;
  cursor:pointer;
  font-size:15.5px;
  font-weight:600;
  list-style:none;
}
.fold > summary::-webkit-details-marker{ display:none; }
.fold > summary::after{
  content:"＋";
  margin-left:auto;
  color:var(--cyan);
  font-family:var(--font-mono);
}
.fold[open] > summary{ border-bottom:1px solid rgba(44,74,114,.55); }
.fold[open] > summary::after{ content:"－"; }
.fold__body{ padding:16px 18px 20px; font-size:14.5px; line-height:1.8; color:var(--muted); }

/* ---------- 19. Footer ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:72px;
  padding:52px var(--gutter) 28px;
  border-top:1px solid var(--line);
  background:
    radial-gradient(620px 300px at 12% 0%,rgba(57,230,216,.075),transparent 70%),
    linear-gradient(180deg,#0A1730,#02040A 62%);
}
@media (min-width:1024px){
  .site-footer{ padding-left:calc(var(--rail-w) + 40px); padding-right:clamp(24px,5vw,84px); }
}
.footer__inner{
  display:grid;
  gap:36px;
  grid-template-columns:1fr;
  max-width:1180px;
}
@media (min-width:720px){
  .footer__inner{ grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (min-width:1080px){
  .footer__inner{ grid-template-columns:1.5fr 1fr 1fr 1.35fr; gap:34px; }
}
.footer__col{ min-width:0; }
.footer__tagline{ font-size:14px; color:var(--cyan); letter-spacing:.06em; margin-bottom:12px; }
.footer__legal{
  font-size:12px;
  line-height:1.9;
  color:var(--muted);
  max-width:100%;
  word-break:break-word;
}
.footer__title{
  font-family:var(--font-mono);
  font-size:10.5px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--muted);
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(44,74,114,.6);
}
.footer__list{ display:flex; flex-direction:column; gap:9px; }
.footer__list a{
  color:var(--paper);
  font-size:14px;
  transition:color .2s var(--ease),transform .2s var(--ease);
  display:inline-block;
}
.footer__list a:hover{ color:var(--cyan); transform:translateX(2px); text-decoration:none; }
.footer__contact{ display:flex; flex-direction:column; gap:12px; }
.footer__contact li{ display:flex; flex-direction:column; gap:3px; }
.footer__key{
  font-size:9.5px;
  letter-spacing:.2em;
  color:var(--cyan);
  text-transform:uppercase;
}
.footer__val{
  font-size:13.5px;
  line-height:1.75;
  color:var(--paper);
  word-break:break-word;
}
.footer__copy{
  margin-top:16px;
  padding:9px 16px;
  background:rgba(18,41,74,.6);
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .2s var(--ease),background .2s var(--ease),color .2s var(--ease);
}
.footer__copy:hover{ border-color:var(--cyan); background:rgba(57,230,216,.12); }
.footer__base{
  display:flex;
  flex-wrap:wrap;
  gap:10px 24px;
  align-items:center;
  justify-content:space-between;
  max-width:1180px;
  margin-top:46px;
  padding-top:20px;
  border-top:1px solid rgba(44,74,114,.55);
}
.footer__note{ font-size:11.5px; color:var(--muted); letter-spacing:.1em; max-width:100%; }

/* ---------- 20. 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:90;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 15px;
  background:rgba(4,7,15,.92);
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s var(--ease),border-color .2s var(--ease);
}
.to-top.is-visible{ opacity:1; visibility:visible; transform:none; }
.to-top:hover{ border-color:var(--cyan); background:rgba(18,41,74,.9); }

/* ---------- 21. 滚动显现 ---------- */
.has-js .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
.has-js .reveal.is-in{ opacity:1; transform:none; }

/* ---------- 22. reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js .reveal{ opacity:1 !important; transform:none !important; }
  .rail::after{ display:none; }
  .to-top{ transform:none; }
}