/* ==========================================================================
   加拿大中心 · 共享样式表 /assets/site.css
   侧边导览式布局 / 纸张叠层 / 印刷贴标 / 清透渐变
   ========================================================================== */

:root{
  --red:#D8232A;
  --red-deep:#A3141B;
  --fir:#1F5C4A;
  --fir-tint:#E4F0EA;
  --glacier:#2E6E9E;
  --glacier-tint:#E3EEF6;
  --paper:#F7F5F2;
  --sheet:#FFFFFF;
  --ink:#14181C;
  --ink-deep:#0B0E11;
  --mute:#5C6670;
  --line:#DCD8D2;
  --line-soft:rgba(220,216,210,.6);

  --rail-w:220px;
  --topbar-h:69px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:220ms;
  --dur-slow:520ms;

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%}
button{font:inherit;color:inherit}
a{color:var(--glacier);text-underline-offset:3px}

:focus-visible{
  outline:3px solid var(--glacier);
  outline-offset:2px;
  border-radius:1px;
}

/* ---------- 全局排版 ---------- */
body{
  padding-top:var(--topbar-h);
  background:var(--paper);
  color:var(--ink);
  font:400 16px/1.75 var(--font-sans);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4{
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
  color:var(--ink);
}

em,i{font-style:normal}

.site-main{
  min-height:60vh;
  scroll-margin-top:80px;
}

#main-content{scroll-margin-top:80px}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:clamp(18px,4vw,64px);
  padding-right:clamp(18px,2.6vw,40px);
}

.prose{max-width:46em}
.prose p + p{margin-top:1.05em}
.prose h3{
  font-size:clamp(1.15rem,2.4vw,1.4rem);
  margin:1.8em 0 .6em;
}
.prose strong{font-weight:800}

/* ---------- 跳至主要内容 ---------- */
.skip-link{
  position:absolute;
  left:14px;
  top:-72px;
  z-index:200;
  padding:10px 18px;
  background:var(--red);
  color:#fff;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  border-radius:1px;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:14px}

/* ==========================================================================
   头部：固定品牌轨道（双层信息导航）
   ========================================================================== */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:80;
  background:var(--sheet);
  border-bottom:1px solid var(--line);
}

.site-header::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:5px;
  background:linear-gradient(90deg,
    var(--red) 0 34%,
    var(--fir) 34% 67%,
    var(--glacier) 67% 100%);
}

.rail-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  height:64px;
  padding:5px 16px 0;
}

.rail-brand{
  flex:1 1 auto;
  min-width:0;
}

.brand-name{
  display:flex;
  align-items:center;
  font-size:17px;
  font-weight:800;
  letter-spacing:.02em;
  line-height:1.3;
  color:var(--ink);
}
.brand-name::before{
  content:"";
  display:inline-block;
  width:3px;
  height:15px;
  margin-right:9px;
  background:var(--red);
  flex:none;
}

.brand-tagline{
  display:none;
  margin-top:8px;
  font-size:12.5px;
  line-height:1.65;
  color:var(--mute);
  max-width:15em;
}

/* 移动端栏目按钮 */
.nav-toggle{
  margin-left:auto;
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  border:1px solid var(--line);
  background:var(--sheet);
  color:var(--ink);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:1px;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--fir);background:var(--fir-tint)}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px;
  height:2px;
  background:currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:16px;height:2px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),top var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"]{border-color:var(--red);color:var(--red-deep)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

/* 导航清单 */
.rail-nav{
  position:absolute;
  top:100%;
  left:0;
  right:0;
  max-height:0;
  overflow:hidden;
  background:var(--sheet);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  transition:max-height 300ms var(--ease);
}
.rail-nav[data-open]{max-height:74vh;overflow-y:auto}

.rail-nav__list{display:flex;flex-direction:column}

.rail-nav__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:12px 18px;
  border-left:3px solid transparent;
  color:var(--ink);
  font-size:15px;
  text-decoration:none;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail-nav__link:hover{
  background:var(--fir-tint);
  border-left-color:var(--fir);
  color:var(--fir);
}
.rail-nav__link[aria-current="page"]{
  background:linear-gradient(90deg,rgba(216,35,42,.10),rgba(216,35,42,0) 90%);
  border-left-color:var(--red);
  color:var(--red-deep);
  font-weight:700;
}
.rail-nav__link[aria-current="page"] .rail-nav__num{color:var(--red)}

.rail-nav__num{
  flex:none;
  font-size:11px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--mute);
  font-variant-numeric:tabular-nums;
}

.rail-foot{display:none}

/* 轨道进度条 */
.rail-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  pointer-events:none;
}
.rail-progress__bar{
  display:block;
  width:100%;height:100%;
  background:var(--red);
  transform:scaleX(var(--p,0));
  transform-origin:0 50%;
  transition:transform 90ms linear;
}

/* ==========================================================================
   通用组件
   ========================================================================== */

/* 编号章节 */
.sec-head{display:grid;gap:8px}
.sec-num{
  font-size:clamp(3rem,7vw,5.5rem);
  font-weight:800;
  line-height:.9;
  letter-spacing:-.03em;
  font-variant-numeric:tabular-nums;
  color:var(--fir);
}
.sec-head__title{
  font-size:clamp(1.75rem,4vw,2.75rem);
  font-weight:800;
  line-height:1.18;
}
.sec-head__lead{
  max-width:46em;
  font-size:.9375rem;
  color:var(--mute);
}

/* 细线 */
.rule{height:1px;border:0;background:var(--line-soft)}
.rule--soft{background:linear-gradient(90deg,var(--line),rgba(220,216,210,0))}

/* 渐变分区 */
.tint-band{
  background:
    radial-gradient(120% 90% at 10% 0%,rgba(46,110,158,.12),rgba(46,110,158,0) 62%),
    linear-gradient(180deg,var(--glacier-tint),var(--paper) 78%);
}

/* 纸张叠层 */
.sheet{
  background:var(--sheet);
  border:1px solid var(--line);
  box-shadow:6px 6px 0 0 rgba(220,216,210,.85);
  padding:clamp(20px,3vw,32px);
}

/* 按钮 */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 22px;
  border:1px solid var(--ink);
  border-radius:1px;
  background:var(--sheet);
  color:var(--ink);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  box-shadow:3px 3px 0 0 var(--ink);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn:hover{transform:translate(-1px,-1px);box-shadow:4px 4px 0 0 var(--ink)}
.btn:active{transform:translate(3px,3px);box-shadow:0 0 0 0 var(--ink)}

.btn--primary{
  background:var(--red);
  border-color:var(--red-deep);
  color:#fff;
  box-shadow:3px 3px 0 0 var(--red-deep);
}
.btn--primary:hover{background:var(--red-deep);box-shadow:4px 4px 0 0 var(--red-deep)}
.btn--primary:active{box-shadow:0 0 0 0 var(--red-deep)}

.btn--ghost{
  border-color:var(--line);
  box-shadow:none;
  color:var(--mute);
  background:transparent;
}
.btn--ghost:hover{
  transform:none;
  border-color:var(--glacier);
  color:var(--glacier);
  background:var(--glacier-tint);
  box-shadow:none;
}

/* 印刷贴标 */
.tag{
  display:inline-block;
  padding:3px 10px 4px;
  border:1px solid var(--mute);
  border-radius:1px;
  background:var(--sheet);
  color:var(--mute);
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.35;
  box-shadow:2px 2px 0 0 var(--line-soft);
  white-space:nowrap;
}
.tag--release{border-color:var(--red);color:var(--red-deep);background:#fff}
.tag--doc{border-color:var(--fir);color:var(--fir);background:var(--fir-tint)}
.tag--service{border-color:var(--glacier);color:var(--glacier);background:var(--glacier-tint)}

/* 面包屑 */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--mute);
}
.crumbs a{color:var(--glacier);text-decoration:none}
.crumbs a:hover{text-decoration:underline}
.crumbs__sep{color:var(--line);}

/* 索引行 */
.index-list{border-top:1px solid var(--line)}
.index-list__row{
  display:grid;
  grid-template-columns:2.6rem 1fr;
  gap:0 14px;
  align-items:baseline;
  padding:15px 6px;
  border-bottom:1px solid var(--line-soft);
  color:inherit;
  text-decoration:none;
  transition:background-color var(--dur) var(--ease);
}
.index-list__row:hover{background:var(--glacier-tint)}
.index-list__num{
  font-size:13px;
  font-weight:700;
  color:var(--fir);
  font-variant-numeric:tabular-nums;
}
.index-list__title{font-weight:700}
.index-list__meta{
  display:block;
  margin-top:2px;
  font-size:13px;
  color:var(--mute);
}

/* 步骤清单 */
.steps{counter-reset:step}
.steps__item{
  display:grid;
  grid-template-columns:24px 1fr;
  gap:14px;
  padding:16px 0;
  border-bottom:1px solid var(--line-soft);
}
.steps__item.is-done .steps__body{color:var(--mute)}
.steps__item.is-done .steps__title{text-decoration:line-through;text-decoration-color:var(--line)}
.steps__box{
  width:22px;height:22px;
  margin-top:2px;
  border:1px solid var(--line);
  background:var(--sheet);
  border-radius:1px;
  cursor:pointer;
  position:relative;
  padding:0;
  transition:background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.steps__box:hover{border-color:var(--fir)}
.steps__box[aria-pressed="true"]{background:var(--fir);border-color:var(--fir)}
.steps__box[aria-pressed="true"]::after{
  content:"";
  position:absolute;
  left:7px;top:3px;
  width:5px;height:10px;
  border:2px solid #fff;
  border-top:0;
  border-left:0;
  transform:rotate(42deg);
}
.steps__title{display:block;font-weight:700}
.steps__body{font-size:.9375rem}
.steps__body p{color:var(--mute);margin-top:4px}

/* 筛选条 */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.filter-chip{
  padding:6px 14px;
  border:1px solid var(--line);
  border-radius:1px;
  background:var(--sheet);
  color:var(--mute);
  font-size:13px;
  font-weight:600;
  letter-spacing:.04em;
  cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.filter-chip:hover{border-color:var(--glacier);color:var(--glacier)}
.filter-chip[aria-pressed="true"]{
  border-color:var(--fir);
  background:var(--fir-tint);
  color:var(--fir);
}
.filter-status{font-size:12.5px;color:var(--mute);font-variant-numeric:tabular-nums}

/* 复制按钮 */
.copy-btn{
  padding:2px 8px;
  border:1px solid var(--line);
  border-radius:1px;
  background:var(--sheet);
  color:var(--mute);
  font-size:11.5px;
  letter-spacing:.06em;
  cursor:pointer;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.copy-btn:hover{color:var(--glacier);border-color:var(--glacier);background:var(--glacier-tint)}
.copy-btn[data-copied="true"]{color:var(--fir);border-color:var(--fir);background:var(--fir-tint)}

/* 响应式图片容器 */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16 / 9;
  display:grid;
  place-items:center;
  overflow:hidden;
  border:1px solid var(--line);
  background:
    radial-gradient(110% 100% at 18% 0%,rgba(46,110,158,.14),rgba(46,110,158,0) 65%),
    linear-gradient(170deg,var(--sheet),var(--paper));
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame img,
.media-frame svg{
  display:block;
  width:100%;height:100%;
  object-fit:cover;
}
.media-frame__caption{
  display:block;
  margin-top:10px;
  font-size:12.5px;
  color:var(--mute);
}

/* 网格 */
.grid{display:grid;gap:24px}
@media (min-width:700px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1000px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:70;
  width:44px;height:44px;
  display:grid;
  place-items:center;
  padding:0;
  border:1px solid var(--line);
  border-radius:1px;
  background:var(--sheet);
  color:var(--ink);
  font-size:12px;
  font-weight:700;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition:opacity var(--dur) var(--ease),visibility var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible}
.to-top:hover{border-color:var(--red);color:var(--red-deep)}

/* 滚动显现 */
.js-on [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity var(--dur-slow) var(--ease),transform var(--dur-slow) var(--ease);
}
.js-on [data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ==========================================================================
   页脚：状态面板
   ========================================================================== */
.site-footer{
  position:relative;
  margin-top:80px;
  background:var(--ink-deep);
  color:#A8B0B8;
  font-size:14px;
  line-height:1.8;
}
.footer-stripe{
  display:block;
  height:4px;
  background:linear-gradient(90deg,
    var(--red) 0 33.33%,
    var(--fir) 33.33% 66.66%,
    var(--glacier) 66.66% 100%);
}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:34px;
  padding:46px 0 30px;
}
.footer-head{
  font-size:12px;
  font-weight:700;
  letter-spacing:.16em;
  color:#6F7A83;
  margin-bottom:14px;
  display:flex;
  align-items:center;
  gap:8px;
}
.footer-head::before{
  content:"";
  width:12px;height:2px;
  background:var(--red);
  flex:none;
}
.footer-brand{
  font-size:19px;
  font-weight:800;
  letter-spacing:.02em;
  color:#F2F4F6;
}
.footer-note{
  margin-top:10px;
  font-size:13.5px;
  color:#8A939B;
  max-width:24em;
}
.status-list{display:grid;gap:7px;margin-top:16px}
.status-list__item{
  display:flex;
  align-items:center;
  gap:9px;
  font-size:12.5px;
  color:#8A939B;
}
.status-dot{width:7px;height:7px;border-radius:50%;flex:none}
.status-dot--release{background:var(--red)}
.status-dot--doc{background:#3E9C7C}
.status-dot--service{background:#5FA3D6}

.footer-links{display:grid;gap:9px}
.footer-links a{
  color:#C6CDD4;
  text-decoration:none;
  font-size:14px;
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-links a:hover{color:#fff;border-bottom-color:var(--red)}

.contact-list{display:grid;gap:11px}
.contact-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 10px;
}
.contact-key{
  font-size:12px;
  letter-spacing:.06em;
  color:#6F7A83;
  flex:none;
  min-width:4.5em;
}
.contact-value{color:#C6CDD4;font-variant-numeric:tabular-nums}

.site-footer .copy-btn{
  background:transparent;
  border-color:#3A4249;
  color:#8A939B;
}
.site-footer .copy-btn:hover{color:#fff;border-color:#6F7A83;background:transparent}
.site-footer .copy-btn[data-copied="true"]{
  color:#8FE0C0;
  border-color:#2F6B57;
  background:rgba(63,156,124,.14);
}

.footer-region{
  margin-top:16px;
  font-size:12.5px;
  color:#6F7A83;
  max-width:26em;
}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  gap:8px 26px;
  justify-content:space-between;
  padding:18px 0 30px;
  border-top:1px solid rgba(255,255,255,.1);
  font-size:12.5px;
  color:#6F7A83;
  font-variant-numeric:tabular-nums;
}

/* ==========================================================================
   断点：平板 / 桌面
   ========================================================================== */
@media (min-width:700px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:36px 32px}
}

@media (min-width:900px){
  body{
    padding-top:0;
    padding-left:var(--rail-w);
    font-size:17px;
  }
  .site-header{
    right:auto;
    bottom:0;
    width:var(--rail-w);
    border-bottom:0;
    border-right:1px solid var(--line);
  }
  .rail-inner{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    height:100%;
    padding:0;
  }
  .rail-brand{
    padding:34px 20px 22px;
    border-bottom:1px solid var(--line);
    background:linear-gradient(165deg,var(--sheet),#F2F7FA);
    flex:none;
  }
  .brand-name{font-size:21px}
  .brand-tagline{display:block}
  .nav-toggle{display:none}
  .rail-nav{
    position:static;
    max-height:none;
    overflow:visible;
    flex:1 1 auto;
    display:flex;
    flex-direction:column;
    padding:14px 0 8px;
    border-top:0;
    border-bottom:0;
    background:transparent;
    transition:none;
  }
  .rail-nav__link{padding:11px 20px;font-size:14.5px}
  .rail-foot{
    display:block;
    margin-top:auto;
    padding:16px 20px 22px;
    font-size:11.5px;
    line-height:1.7;
    letter-spacing:.04em;
    color:var(--mute);
    border-top:1px solid var(--line-soft);
  }
  .rail-progress{
    left:auto;right:-1px;
    top:0;bottom:0;
    width:2px;height:auto;
  }
  .rail-progress__bar{
    transform:scaleY(var(--p,0));
    transform-origin:50% 0;
  }
  .to-top{right:28px;bottom:28px}
}

@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.5fr 1fr 1.35fr 1.1fr;gap:40px}
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .js-on [data-reveal]{opacity:1;transform:none}
  .rail-progress__bar{transition:none}
}