/* ============================================================
   加拿大平台讯 · 共享外壳样式 /assets/site.css
   冰原数据档案：深墨蓝侧轨 + 冰原米白阅读区 + 蓝图坐标网格
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100vh;overflow-x:hidden}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0D1B2A;
  --ink-2:#14283D;
  --maple:#C8102E;
  --maple-soft:#E8574A;
  --amber:#E0A43B;
  --ice:#F6F2EA;
  --cool:#DDE3E8;
  --steel:#7C8B99;
  --char:#1B2733;
  --lake:#4E8C8A;

  --rail-w:88px;
  --rail-w-min:64px;
  --bar-h:64px;

  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --pill:999px;

  --ease:cubic-bezier(.2,.7,.2,1);
  --gutter:28px;
  --maxw:1400px;

  --font-display:'Oswald','Barlow Condensed','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-body:'Noto Serif SC','Source Han Serif SC','Songti SC','SimSun',Georgia,serif;
  --font-mono:'IBM Plex Mono','JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--ice);
  color:var(--char);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.18;
  letter-spacing:.06em;
  color:var(--char);
}
h1{font-size:clamp(30px,4.6vw,48px)}
h2{font-size:clamp(24px,3.2vw,32px)}
h3{font-size:clamp(19px,2.2vw,22px)}
h4{font-size:18px}
code,kbd,samp,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.num,.fstat__num,.nav__index,.footer__legal,.footer__data-note,
[data-number]{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

::selection{background:var(--maple);color:var(--ice)}

:focus-visible{outline:2px solid var(--maple);outline-offset:3px;border-radius:6px}
.rail :focus-visible,
.site-footer :focus-visible{outline-color:var(--amber)}

/* ---------- 4. 工具类 ---------- */
.sr-only{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.rule{height:1px;border:0;background:var(--cool);margin:0}

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

.prose{max-width:38em;font-size:17px;line-height:1.85}
.prose h2{font-size:26px;margin:2.4em 0 .7em}
.prose h3{font-size:20px;margin:1.9em 0 .6em}
.prose p{margin:0 0 1.3em}
.prose ul,.prose ol{list-style:disc;padding-left:1.3em;margin:0 0 1.3em}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.5em}
.prose strong{font-weight:700;color:var(--ink)}
.prose a{color:var(--maple);text-decoration:none;border-bottom:1px solid rgba(200,16,46,.32)}
.prose a:hover{border-bottom-color:var(--maple)}
.prose blockquote{
  margin:0 0 1.4em;padding:4px 0 4px 20px;
  border-left:3px solid var(--amber);color:var(--ink-2);
}

/* 面包屑 */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  list-style:none;margin:0 0 26px;padding:0;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--steel);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--cool)}
.breadcrumbs a{text-decoration:none}
.breadcrumbs a:hover{color:var(--maple)}

/* 栏目标签 */
.label{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-display);font-size:11px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--steel);
}
.label::before{content:"";width:18px;height:1px;background:currentColor;opacity:.65}
.label--dark{color:var(--amber)}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 26px;border-radius:var(--pill);border:1px solid transparent;
  font-family:var(--font-display);font-size:13px;font-weight:600;letter-spacing:.14em;
  text-decoration:none;cursor:pointer;
  transition:background-color .25s var(--ease),color .25s var(--ease),
             border-color .25s var(--ease),transform .25s var(--ease);
}
.btn--primary{background:var(--maple);color:var(--ice)}
.btn--primary:hover{background:var(--maple-soft);transform:translateY(-2px)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--cool)}
.btn--ghost:hover{border-color:var(--ink);background:rgba(13,27,42,.05)}
.btn--on-dark{background:transparent;color:var(--ice);border-color:rgba(246,242,234,.34)}
.btn--on-dark:hover{border-color:var(--amber);color:var(--amber)}

/* 胶囊筛选 */
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 16px;border-radius:var(--pill);
  border:1px solid var(--cool);background:#fff;color:var(--char);
  font-family:var(--font-display);font-size:11.5px;font-weight:600;letter-spacing:.1em;
  cursor:pointer;transition:all .25s var(--ease);
}
.pill:hover{border-color:var(--ink)}
.pill.is-active,.pill[aria-pressed="true"]{background:var(--ink);color:var(--ice);border-color:var(--ink)}

/* 图片 / 图形占位容器 */
.img-frame{
  position:relative;display:block;overflow:hidden;
  border-radius:var(--r-lg);background:var(--ink-2);
  aspect-ratio:16/9;
}
.img-frame>img,.img-frame>picture>img{width:100%;height:100%;object-fit:cover}
.img-frame--wide{aspect-ratio:21/9}
.img-frame--square{aspect-ratio:1/1}
.img-frame--tall{aspect-ratio:3/4}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;
  background-image:
    linear-gradient(rgba(221,227,232,.16) 1px,transparent 1px),
    linear-gradient(90deg,rgba(221,227,232,.16) 1px,transparent 1px);
  background-size:44px 44px;opacity:.55;
}

/* ---------- 5. 头部外壳 ---------- */
.site-header{position:relative;z-index:90}

.skip-link{
  position:fixed;top:10px;left:calc(var(--rail-w) + 14px);z-index:200;
  padding:11px 20px;border-radius:var(--pill);
  background:var(--maple);color:var(--ice);text-decoration:none;
  font-family:var(--font-display);font-size:12.5px;font-weight:600;letter-spacing:.14em;
  transform:translateY(-180%);
  transition:transform .25s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* 侧边轨道 */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:70;
  background:var(--ink);color:var(--ice);
  display:flex;flex-direction:column;align-items:center;gap:12px;
  padding:20px 0 calc(20px + env(safe-area-inset-bottom,0px));
  border-right:1px solid rgba(221,227,232,.14);
  transition:width .35s var(--ease),transform .35s var(--ease);
}
.rail::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(221,227,232,.06) 1px,transparent 1px);
  background-size:100% 44px;
}

.rail__brand{
  position:relative;z-index:1;flex:0 0 auto;
  display:flex;flex-direction:column;align-items:center;gap:12px;
  text-decoration:none;color:inherit;
}
.rail__mark{
  display:grid;place-items:center;width:44px;height:44px;border-radius:14px;
  background:var(--maple);color:var(--ice);
  font-family:var(--font-display);font-size:20px;font-weight:700;
  box-shadow:inset 0 0 0 1px rgba(246,242,234,.2);
}
.rail__brand-text{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--font-display);font-size:12px;font-weight:600;
  letter-spacing:.24em;color:rgba(246,242,234,.86);
}

/* 导航 */
.nav{
  position:relative;z-index:1;flex:1 1 auto;min-height:0;width:100%;
  display:flex;flex-direction:column;align-items:center;
  overflow-y:auto;overflow-x:hidden;scrollbar-width:thin;
}
.nav__head{display:none;align-items:center;justify-content:space-between;gap:12px}
.nav__head-label{
  font-family:var(--font-display);font-size:11px;font-weight:600;
  letter-spacing:.24em;color:var(--steel);
}
.nav__close{
  display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;
  border:1px solid rgba(221,227,232,.26);background:transparent;color:var(--ice);
  font-size:13px;line-height:1;cursor:pointer;
  transition:background-color .25s var(--ease),border-color .25s var(--ease),color .25s var(--ease);
}
.nav__close:hover{background:rgba(246,242,234,.1);border-color:var(--amber);color:var(--amber)}

.nav__list{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  width:100%;padding:0 0 8px;
}
.nav__item{width:100%}
.nav__link{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:3px;
  width:100%;padding:8px 0;text-decoration:none;
  color:rgba(246,242,234,.62);
  transition:color .25s var(--ease),background-color .25s var(--ease);
}
.nav__link::before{
  content:"";position:absolute;left:0;top:50%;width:3px;height:24px;
  border-radius:0 3px 3px 0;background:var(--maple);
  transform:translateY(-50%) scaleY(0);
  transition:transform .25s var(--ease);
}
.nav__index{
  font-size:9.5px;letter-spacing:.16em;color:var(--steel);
  transition:color .25s var(--ease);
}
.nav__label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--font-display);font-size:12.5px;font-weight:600;letter-spacing:.14em;
}
.nav__link:hover{color:var(--ice);background:rgba(246,242,234,.06)}
.nav__link:hover .nav__index{color:var(--amber)}
.nav__link[aria-current="page"]{color:var(--ice);background:rgba(200,16,46,.18)}
.nav__link[aria-current="page"]::before{transform:translateY(-50%) scaleY(1)}
.nav__link[aria-current="page"] .nav__index{color:var(--maple-soft)}

.nav__meta{
  display:none;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--steel);
}

/* 侧轨折叠 */
.rail__toggle{
  position:relative;z-index:1;flex:0 0 auto;
  display:flex;flex-direction:column;align-items:center;gap:7px;padding:8px 0;
  color:rgba(246,242,234,.55);
  font-family:var(--font-display);font-size:10px;letter-spacing:.16em;
  transition:color .25s var(--ease);
}
.rail__toggle:hover{color:var(--ice)}
.rail__toggle-icon{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.rail__toggle-icon::before,
.rail__toggle-icon::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:currentColor;transition:transform .3s var(--ease);
}
.rail__toggle-icon::before{top:-5px}
.rail__toggle-icon::after{top:5px}

/* 顶部条 */
.topbar{
  position:fixed;top:0;left:0;right:0;height:var(--bar-h);z-index:50;
  display:flex;align-items:center;
  background:rgba(246,242,234,.93);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--cool);
  transition:left .35s var(--ease);
}
.topbar__inner{
  width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter);
  display:flex;align-items:center;gap:18px;
}
.topbar__brand{
  display:none;flex:0 0 auto;text-decoration:none;white-space:nowrap;
  font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.1em;color:var(--ink);
}
.topbar__meta{
  min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  font-family:var(--font-display);font-size:12.5px;font-weight:600;
  letter-spacing:.1em;color:var(--steel);
}

/* 检索框 */
.search{
  position:relative;margin-left:auto;flex:0 0 auto;
  display:flex;align-items:center;height:40px;width:clamp(190px,26vw,320px);
  padding:0 16px 0 36px;border:1px solid var(--cool);border-radius:var(--pill);
  background:#fff;
  transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.search:focus-within{border-color:var(--maple);box-shadow:0 0 0 3px rgba(200,16,46,.12)}
.search__icon{
  position:absolute;left:15px;top:50%;margin-top:-8px;
  width:12px;height:12px;border:1.5px solid var(--steel);border-radius:50%;
}
.search__icon::after{
  content:"";position:absolute;right:-4px;bottom:-3px;width:6px;height:1.5px;
  border-radius:2px;background:var(--steel);transform:rotate(45deg);
}
.search__input{
  width:100%;height:100%;border:0;background:none;outline:none;
  font-family:var(--font-body);font-size:14px;color:var(--char);
  -webkit-appearance:none;appearance:none;
}
.search__input::placeholder{font-size:13px;color:var(--steel)}
.search__input::-webkit-search-cancel-button{-webkit-appearance:none}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;justify-content:center;flex:0 0 auto;
  width:38px;height:38px;border-radius:12px;background:var(--ink);
  transition:background-color .25s var(--ease);
}
.nav-toggle:hover{background:var(--ink-2)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:var(--ice)}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;border-radius:2px;
  background:var(--ice);transition:transform .3s var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

/* 抽屉遮罩 */
.nav-scrim{
  position:fixed;inset:0;z-index:65;
  background:rgba(13,27,42,.58);
  opacity:0;visibility:hidden;
  transition:opacity .3s var(--ease),visibility .3s linear;
}
.nav-scrim[data-visible]{opacity:1;visibility:visible}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:0;padding:88px 0 36px;
  background:var(--ink);color:var(--ice);
  border-top:2px solid var(--maple);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(221,227,232,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(221,227,232,.055) 1px,transparent 1px);
  background-size:88px 88px;
}
.footer__grid{
  position:relative;width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter);
  display:grid;
  grid-template-columns:minmax(0,1.55fr) repeat(3,minmax(0,.72fr));
  gap:56px 44px;
}
.footer__brand{
  font-family:var(--font-display);font-size:26px;font-weight:700;
  letter-spacing:.1em;color:var(--ice);
}
.footer__tag{
  margin-top:8px;
  font-family:var(--font-display);font-size:12px;font-weight:600;
  letter-spacing:.2em;color:var(--amber);
}
.footer__summary{
  margin-top:18px;max-width:46ch;
  font-size:14.5px;line-height:1.9;color:rgba(246,242,234,.72);
}
.footer__stats{
  display:flex;flex-wrap:wrap;gap:14px 30px;
  margin-top:28px;list-style:none;padding:0;
}
.fstat{
  display:flex;flex-direction:column;gap:2px;
  padding-left:14px;border-left:1px solid rgba(221,227,232,.2);
}
.fstat__num{font-size:22px;font-weight:600;color:var(--amber);line-height:1.2}
.fstat__label{
  font-family:var(--font-display);font-size:10.5px;font-weight:600;
  letter-spacing:.18em;color:rgba(246,242,234,.5);
}
.footer__contact{
  display:flex;flex-direction:column;gap:6px;margin-top:28px;
  font-size:14px;color:rgba(246,242,234,.76);
}
.footer__note{
  margin-top:8px;max-width:36ch;
  font-size:12.5px;line-height:1.8;color:rgba(246,242,234,.48);
}
.footer__col{display:flex;flex-direction:column;gap:14px}
.footer__col-title{
  font-family:var(--font-display);font-size:11.5px;font-weight:600;
  letter-spacing:.22em;color:var(--amber);
}
.footer__links{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-block;padding-bottom:1px;
  font-size:14.5px;color:rgba(246,242,234,.74);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .25s var(--ease),border-color .25s var(--ease);
}
.footer__link:hover{color:var(--ice);border-bottom-color:var(--maple-soft)}
.footer__link[aria-current="page"]{color:var(--amber);border-bottom-color:var(--amber)}

.footer__bottom{
  position:relative;width:100%;max-width:var(--maxw);margin:64px auto 0;
  padding:24px var(--gutter) 0;
  border-top:1px solid rgba(221,227,232,.14);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 28px;
  font-size:12.5px;color:rgba(246,242,234,.55);
}
.footer__legal{letter-spacing:.05em}
.footer__data-note{font-size:12px}

/* ---------- 7. 页面显现 ---------- */
@media (prefers-reduced-motion: no-preference){
  [data-reveal]{
    opacity:0;transform:translateY(12px);
    transition:opacity .4s var(--ease),transform .4s var(--ease);
    will-change:opacity,transform;
  }
  [data-reveal].is-in{opacity:1;transform:none}
}

/* ---------- 8. 桌面端布局（≥901px） ---------- */
@media (min-width:901px){
  body{padding-left:var(--rail-w);padding-top:var(--bar-h);transition:padding-left .35s var(--ease)}
  .topbar{left:var(--rail-w)}
  .nav-scrim{display:none}

  body.is-rail-collapsed{padding-left:var(--rail-w-min)}
  body.is-rail-collapsed .rail{width:var(--rail-w-min)}
  body.is-rail-collapsed .topbar{left:var(--rail-w-min)}
  body.is-rail-collapsed .rail__brand-text{display:none}
  body.is-rail-collapsed .nav__label{
    position:absolute;width:1px;height:1px;padding:0;margin:-1px;
    overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);
    white-space:nowrap;border:0;writing-mode:horizontal-tb;
  }
}

/* ---------- 9. 平板（≤1100px） ---------- */
@media (max-width:1100px){
  .footer__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:44px 32px}
  .footer__identity{grid-column:1 / -1}
}

/* ---------- 10. 移动端（≤900px） ---------- */
@media (max-width:900px){
  body{padding-top:58px}
  body.nav-open{overflow:hidden}

  .skip-link{left:14px;top:8px}

  .rail{
    width:min(84vw,340px);
    transform:translateX(-102%);
    align-items:stretch;
    gap:6px;padding:18px 0 26px;
    box-shadow:0 30px 80px rgba(13,27,42,.5);
  }
  .rail[data-open]{transform:translateX(0)}

  .rail__brand{
    flex-direction:row;align-items:center;gap:14px;
    padding:0 20px 18px;margin-bottom:6px;
    border-bottom:1px solid rgba(221,227,232,.14);
  }
  .rail__brand-text{
    writing-mode:horizontal-tb;
    font-size:16px;letter-spacing:.16em;color:var(--ice);
  }
  .rail__mark{width:38px;height:38px;border-radius:12px;font-size:17px}

  .rail__toggle{display:none}

  .nav{flex:1 1 auto;align-items:stretch;padding-bottom:16px}
  .nav__head{display:flex;padding:0 20px 12px;width:100%}
  .nav__list{gap:0;padding:0}
  .nav__link{
    flex-direction:row;justify-content:flex-start;gap:14px;
    padding:15px 20px;border-radius:0;
  }
  .nav__link::before{height:24px}
  .nav__index{width:26px;font-size:11px;letter-spacing:.1em}
  .nav__label{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.08em}
  .nav__meta{display:block;padding:14px 20px 0;border-top:1px solid rgba(221,227,232,.14)}

  .topbar{height:58px;left:0}
  .topbar__inner{padding:0 14px;gap:10px}
  .topbar__meta{display:none}
  .topbar__brand{display:block}
  .nav-toggle{display:flex}
  .search{width:auto;flex:1 1 auto;min-width:0;height:36px;padding:0 12px 0 32px}
  .search__icon{left:13px}
  .search__input{font-size:13px}
  .search__input::placeholder{font-size:12px}

  .footer__grid{grid-template-columns:minmax(0,1fr);gap:40px}
  .footer__identity{grid-column:auto}
}

/* ---------- 11. 小屏（≤640px） ---------- */
@media (max-width:640px){
  :root{--gutter:18px}
  body{font-size:16px}
  .site-footer{padding:64px 0 28px}
  .footer__bottom{margin-top:44px;padding-top:20px}
  .grid{grid-template-columns:minmax(0,1fr);gap:20px}
  .prose{font-size:16px}
  .fstat__num{font-size:19px}
}

/* ---------- 12. 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;
  }
  [data-reveal]{opacity:1!important;transform:none!important}
}