/* =========================================================
   正版U蓝 · Site Kit 共享样式  /assets/site.css
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#0B1420;
  --steel:#14315C;
  --ublue:#1D5BD6;
  --ublue-deep:#17479F;
  --tint:#5B8DEF;
  --cyan:#2EE6D6;
  --orange:#E4572E;
  --paper:#F6F1E6;
  --mist:#DFE6EE;
  --white:#F7F9FC;
  --green:#1F9D6B;

  --rail-w:88px;
  --shell-w:1240px;
  --gutter:clamp(18px,4.6vw,56px);
  --radius:10px;
  --radius-sm:6px;
  --shadow:0 1px 0 rgba(11,20,32,.03), 0 16px 32px -26px rgba(11,20,32,.5);
  --dur:.22s;

  --font-sans:'Noto Sans SC','Source Han Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,-apple-system,sans-serif;
  --font-mono:'JetBrains Mono','Roboto Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 2. Reset & 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.01em;
  color:var(--ink);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,dl,dd,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
[hidden]{display:none !important}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:3px}
::selection{background:var(--ublue);color:#fff}

#main-content{scroll-margin-top:76px}

/* ---------- 3. 跳转链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:-120px;z-index:200;
  display:inline-flex;align-items:center;min-height:44px;
  padding:10px 18px;background:var(--ink);color:#fff;
  font-size:14px;font-weight:700;border-radius:0 0 var(--radius-sm) var(--radius-sm);
  transition:top var(--dur) ease;
}
.skip-link:focus{top:0}

/* ---------- 4. 排版 ---------- */
.h-display{
  font-weight:900;font-size:clamp(2.15rem,6.4vw,4.25rem);
  line-height:1.08;letter-spacing:-.012em;
}
.h-section{
  font-weight:900;font-size:clamp(1.45rem,3.1vw,2.15rem);
  line-height:1.18;letter-spacing:-.006em;
}
.h-sub{font-weight:800;font-size:clamp(1.05rem,1.5vw,1.3rem);line-height:1.35}
.eyebrow{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--ublue);
}
.lede{font-size:clamp(1rem,1.5vw,1.125rem);line-height:1.78;color:var(--steel);max-width:36em}
.mono{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em}
.prose{max-width:36em;color:var(--steel);line-height:1.85}
.prose > * + *{margin-top:1.1em}
.prose strong{color:var(--ink)}
.annotation{
  font-size:11px;font-weight:500;letter-spacing:.2em;
  color:var(--steel);opacity:.72;
}
.annotation--vertical{writing-mode:vertical-rl;text-orientation:mixed}
.text-blue{color:var(--ublue)}
.text-cyan{color:var(--cyan)}

/* ---------- 5. 布局容器 ---------- */
.shell{
  width:100%;max-width:var(--shell-w);margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(46px,7vw,96px)}
.section--paper{background:var(--paper)}
.section--mist{background:var(--mist)}
.section--ink{background:var(--ink);color:#E8EEF7}
.section--ink .lede,.section--ink .prose{color:#A9BDD8}
.section--tight{padding-block:clamp(28px,4vw,52px)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-2,.grid-3{grid-template-columns:1fr}
@media (min-width:620px){.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:860px){.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}}
.tile-grid{display:grid;gap:14px;grid-template-columns:1fr}
@media (min-width:560px){.tile-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (min-width:960px){.tile-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}

/* ---------- 6. 按钮 / 芯片 / 徽标 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 20px;border-radius:var(--radius-sm);
  font-size:15px;font-weight:700;letter-spacing:.02em;
  border:1px solid transparent;cursor:pointer;
  transition:background var(--dur) ease,border-color var(--dur) ease,color var(--dur) ease,transform var(--dur) ease;
}
.btn--primary{background:var(--ublue);border-color:var(--ublue);color:#fff}
.btn--primary:hover{background:var(--ublue-deep);border-color:var(--ublue-deep)}
.btn--ghost{background:transparent;border-color:var(--mist);color:var(--ublue)}
.btn--ghost:hover{border-color:var(--tint);color:var(--steel)}
.btn--ink{background:var(--ink);border-color:var(--ink);color:#fff}
.btn--ink:hover{background:var(--steel);border-color:var(--steel)}
.btn--sm{min-height:38px;padding:6px 14px;font-size:13px}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  min-height:38px;padding:7px 15px;border-radius:999px;
  border:1px solid var(--mist);background:#fff;color:var(--steel);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;
  cursor:pointer;transition:background var(--dur) ease,color var(--dur) ease,border-color var(--dur) ease;
}
.chip:hover{border-color:var(--tint)}
.chip[aria-pressed="true"],.chip.is-active{
  background:var(--ublue);border-color:var(--ublue);color:#fff;
}

.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:2px 8px;border-radius:4px;border:1px solid;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;line-height:1.6;
}
.badge--new{color:var(--orange);border-color:rgba(228,87,46,.42);background:rgba(228,87,46,.08)}
.badge--ok{color:var(--green);border-color:rgba(31,157,107,.38);background:rgba(31,157,107,.08)}
.badge--blue{color:var(--ublue);border-color:rgba(29,91,214,.32);background:rgba(29,91,214,.07)}

/* ---------- 7. 卡片 / 磁贴 ---------- */
.card{
  background:#fff;border:1px solid var(--mist);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,26px);box-shadow:var(--shadow);
}
.card--paper{background:var(--paper);border-color:rgba(11,20,32,.09);box-shadow:none}
.card--ink{background:var(--ink);border-color:rgba(232,238,247,.14);color:#E8EEF7}
.card--flat{box-shadow:none}
.card__meta{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--steel);opacity:.78;
}
.tile{
  display:block;background:#fff;border:1px solid var(--mist);border-radius:var(--radius);
  padding:clamp(16px,2.2vw,22px);box-shadow:var(--shadow);
  transition:transform var(--dur) ease,border-color var(--dur) ease,box-shadow var(--dur) ease;
}
.tile:hover,.tile:focus-visible{transform:translateY(-2px);border-color:var(--cyan);box-shadow:0 18px 34px -26px rgba(11,20,32,.55)}
.tile__label{font-weight:800;font-size:1.05rem;line-height:1.35}
.tile__desc{margin-top:6px;font-size:14px;color:var(--steel)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:0 8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--steel);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:0 8px}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--mist)}
.breadcrumb a{border-bottom:1px solid transparent;transition:color var(--dur) ease,border-color var(--dur) ease}
.breadcrumb a:hover{color:var(--ublue);border-bottom-color:var(--tint)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ---------- 9. 图文容器（供页面阶段放置图片） ---------- */
.media{
  position:relative;overflow:hidden;display:block;
  background:var(--mist);
  border:1px solid var(--mist);border-radius:var(--radius);
}
.media img,.media svg{width:100%;height:100%;object-fit:cover;border-radius:inherit}
.media--16x9{aspect-ratio:16 / 9}
.media--4x3{aspect-ratio:4 / 3}
.media--1x1{aspect-ratio:1 / 1}
.media--3x4{aspect-ratio:3 / 4}
.media--phone{aspect-ratio:9 / 19.5;max-width:300px}
.media--paper{background:var(--paper);border-color:rgba(11,20,32,.09)}
.media__caption{
  margin-top:10px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.06em;color:var(--steel);opacity:.8;
}

/* ---------- 10. 折叠面板 ---------- */
.disclosure{
  border:1px solid var(--mist);border-radius:var(--radius);
  background:#fff;overflow:hidden;
}
.disclosure + .disclosure{margin-top:10px}
.disclosure__trigger{
  display:flex;align-items:center;gap:14px;width:100%;text-align:left;
  min-height:52px;padding:14px clamp(16px,2.2vw,22px);
  font-weight:700;font-size:15.5px;color:var(--ink);
  transition:background var(--dur) ease;
}
.disclosure__trigger:hover{background:rgba(91,141,239,.07)}
.disclosure__label{flex:1}
.disclosure__icon{
  position:relative;flex:none;width:14px;height:14px;margin-left:auto;color:var(--ublue);
}
.disclosure__icon::before,.disclosure__icon::after{
  content:"";position:absolute;left:0;right:0;top:50%;height:1.5px;
  background:currentColor;transform:translateY(-50%);
  transition:transform var(--dur) ease;
}
.disclosure__icon::after{transform:translateY(-50%) rotate(90deg)}
.disclosure__trigger[aria-expanded="true"] .disclosure__icon::after{transform:translateY(-50%) rotate(0deg)}
.disclosure__panel{
  padding:0 clamp(16px,2.2vw,22px) 20px;
  border-top:1px solid var(--mist);
  color:var(--steel);font-size:15px;line-height:1.85;
}
.js-ready .disclosure__panel:not([hidden]){animation:panelIn var(--dur) ease both}
@keyframes panelIn{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:none}}

/* ---------- 11. 显现 / 回顶 ---------- */
.js-ready [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .26s ease,transform .26s ease}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

.to-top{
  position:fixed;right:18px;bottom:22px;z-index:70;
  display:inline-flex;align-items:center;justify-content:center;
  min-height:44px;padding:8px 16px;border-radius:999px;
  background:var(--ink);color:#fff;font-size:13px;font-weight:700;letter-spacing:.06em;
  border:1px solid rgba(46,230,214,.45);
  box-shadow:0 16px 32px -20px rgba(11,20,32,.75);
}

/* ---------- 12. 头部：移动端顶栏 + 抽屉 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  display:flex;align-items:center;gap:12px;
  min-height:60px;padding:8px 16px;
  background:var(--ink);color:#E8EEF7;
  border-bottom:1px solid rgba(232,238,247,.12);
}
.scroll-progress{
  position:fixed;left:0;right:0;top:0;height:2px;z-index:80;
  background:var(--cyan);transform:scaleX(0);transform-origin:0 50%;
  pointer-events:none;transition:transform .09s linear;
}
.brand{display:flex;align-items:center;gap:10px;min-height:44px}
.brand-mark{
  display:grid;place-items:center;flex:none;width:32px;height:32px;
  background:var(--ublue);color:#fff;border-radius:var(--radius-sm);
  font-family:var(--font-mono);font-size:16px;font-weight:700;
  box-shadow:inset 0 0 0 1px rgba(46,230,214,.55);
}
.brand-name{display:block;font-size:16px;font-weight:900;letter-spacing:.05em;line-height:1.2}
.brand-tag{display:block;margin-top:2px;font-size:10px;letter-spacing:.14em;color:#8098B8;line-height:1.2}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;margin-left:auto;
  min-height:44px;padding:0 13px;
  border:1px solid rgba(232,238,247,.26);border-radius:var(--radius-sm);
  color:#E8EEF7;font-size:13px;letter-spacing:.1em;
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bar{display:block;height:1.5px;background:currentColor;transition:transform var(--dur) ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-2.75px) rotate(-45deg)}

.site-nav{
  position:fixed;top:0;right:0;bottom:0;z-index:75;
  display:flex;flex-direction:column;gap:16px;
  width:min(88vw,360px);padding:76px 20px 26px;
  background:var(--steel);color:#E8EEF7;
  border-left:1px solid rgba(232,238,247,.16);
  overflow-y:auto;
  transform:translateX(103%);visibility:hidden;
  transition:transform .28s cubic-bezier(.4,0,.2,1),visibility .28s;
}
.site-nav[data-open]{transform:translateX(0);visibility:visible}
.nav-scrim{
  position:fixed;inset:0;z-index:70;width:100%;height:100%;
  background:rgba(11,20,32,.58);border:0;padding:0;
  opacity:0;pointer-events:none;transition:opacity .28s ease;
}
.site-nav[data-open] + .nav-scrim{opacity:1;pointer-events:auto}
body.is-nav-open{overflow:hidden}

.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-link{
  position:relative;display:flex;align-items:center;gap:12px;
  min-height:48px;padding:10px 12px;border-radius:var(--radius-sm);
  color:#CBD9EC;font-size:15px;
  border-left:2px solid transparent;
  transition:background var(--dur) ease,color var(--dur) ease,border-color var(--dur) ease;
}
.nav-index{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:#7E97B8;
}
.nav-link:hover{background:rgba(232,238,247,.08);color:#fff}
.nav-link[aria-current="page"]{
  color:#fff;background:rgba(29,91,214,.3);border-left-color:var(--cyan);
}
.rail-foot{display:flex;flex-direction:column;gap:10px;margin-top:auto}
.nav-cta{
  display:flex;align-items:center;justify-content:center;
  min-height:46px;padding:12px 16px;border-radius:var(--radius-sm);
  background:var(--ublue);border:1px solid var(--ublue);
  color:#fff;font-size:14px;font-weight:700;letter-spacing:.08em;
  transition:background var(--dur) ease,border-color var(--dur) ease;
}
.nav-cta:hover{background:var(--ublue-deep);border-color:var(--cyan)}
.nav-cta--ghost{background:transparent;border-color:rgba(203,217,236,.4);color:#DCE7F5}
.nav-cta--ghost:hover{background:rgba(232,238,247,.08);border-color:var(--cyan)}
.rail-note{margin-top:6px;font-size:11.5px;line-height:1.7;color:#8FA6C2}

/* ---------- 13. 头部：桌面侧边轨道 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  #main-content{scroll-margin-top:0}
  .scroll-progress{left:var(--rail-w)}

  .site-header{
    position:fixed;top:0;left:0;bottom:0;z-index:60;
    width:var(--rail-w);height:100vh;height:100dvh;min-height:0;
    flex-direction:column;align-items:stretch;gap:0;
    padding:18px 0 14px;
    border-bottom:0;border-right:1px solid rgba(232,238,247,.14);
    overflow:hidden;
  }
  .brand{
    flex-direction:column;align-items:center;gap:7px;
    min-height:0;margin:0 8px;padding:0 6px 16px;
    border-bottom:1px solid rgba(232,238,247,.14);text-align:center;
  }
  .brand-mark{width:36px;height:36px;font-size:17px}
  .brand-name{font-size:15px;letter-spacing:.1em}
  .brand-tag{margin-top:4px;max-width:66px;font-size:9px;letter-spacing:.05em;line-height:1.55}
  .nav-toggle{display:none}
  .nav-scrim{display:none}

  .site-nav{
    position:static;transform:none;visibility:visible;
    width:100%;flex:1;min-height:0;gap:0;
    padding:14px 10px 0;background:transparent;
    border-left:0;overflow-y:auto;overflow-x:hidden;
  }
  .nav-list{flex:1;gap:2px;justify-content:space-evenly}
  .nav-item{display:flex;justify-content:center}
  .nav-link{
    flex-direction:column;align-items:center;gap:8px;
    min-height:0;padding:6px 2px;border-left:0;border-radius:0;
    background:transparent;color:#9DB2CE;
    font-size:13px;letter-spacing:.14em;
  }
  .nav-link::after{
    content:"";position:absolute;right:-10px;top:2px;bottom:2px;width:2px;
    background:transparent;transition:background var(--dur) ease;
  }
  .nav-link:hover{background:transparent;color:#fff}
  .nav-link[aria-current="page"]{background:transparent;color:#fff;border-left:0}
  .nav-link[aria-current="page"]::after{background:var(--ublue)}
  .nav-index{font-size:10px;color:#5F7791;letter-spacing:.08em}
  .nav-link[aria-current="page"] .nav-index{color:var(--cyan)}
  .nav-label{writing-mode:vertical-rl;text-orientation:mixed;line-height:1.25}

  .rail-foot{gap:8px;padding-top:12px;margin-top:10px;border-top:1px solid rgba(232,238,247,.12)}
  .nav-cta{
    display:block;width:100%;min-height:0;padding:11px 0;
    writing-mode:vertical-rl;text-orientation:mixed;text-align:center;
    font-size:12px;letter-spacing:.22em;
  }
  .rail-note{display:none}
}

/* ---------- 14. 页脚 ---------- */
.footer-band{
  height:10px;background:var(--mist);
  border-top:1px solid rgba(11,20,32,.07);
  border-bottom:1px solid rgba(11,20,32,.05);
}
.site-footer{background:var(--paper);color:var(--ink)}
.footer-inner{
  display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,44px);
  padding-block:clamp(34px,5vw,64px);
}
.footer-logo{
  display:inline-block;font-size:1.35rem;font-weight:900;letter-spacing:.08em;
  border-bottom:2px solid var(--ublue);padding-bottom:4px;
}
.footer-brandline{
  margin-top:14px;font-family:var(--font-mono);font-size:11.5px;
  letter-spacing:.1em;color:var(--steel);
}
.footer-note{margin-top:12px;max-width:32em;font-size:13.5px;line-height:1.8;color:#4A5E78}

.footer-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.footer-heading{
  font-size:12px;font-weight:800;letter-spacing:.16em;
  color:var(--steel);text-transform:uppercase;
}
.footer-heading::after{
  content:"";display:block;width:22px;height:2px;margin-top:8px;background:var(--ublue);
}
.footer-links{margin-top:14px;display:flex;flex-direction:column;gap:9px}
.footer-links a{
  display:inline-block;min-height:26px;font-size:14px;color:#33475F;
  border-bottom:1px solid transparent;
  transition:color var(--dur) ease,border-color var(--dur) ease;
}
.footer-links a:hover{color:var(--ublue);border-bottom-color:var(--tint)}

.footer-contact{
  border:1px solid rgba(11,20,32,.09);border-radius:var(--radius);
  background:rgba(247,249,252,.85);padding:clamp(18px,2.4vw,24px);
}
.footer-contact-item{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-top:14px;font-size:14px;color:var(--ink);
}
.footer-contact-key{
  flex:none;min-width:34px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.08em;color:var(--steel);
}
.footer-contact-value{font-family:var(--font-mono);font-size:13px;word-break:break-all}
.copy-btn{
  flex:none;min-height:30px;padding:2px 10px;border-radius:999px;
  border:1px solid var(--mist);background:#fff;color:var(--ublue);
  font-size:11.5px;letter-spacing:.06em;
  transition:border-color var(--dur) ease,background var(--dur) ease,color var(--dur) ease;
}
.copy-btn:hover{border-color:var(--tint)}
.copy-btn.is-copied{background:var(--green);border-color:var(--green);color:#fff}
.footer-contact-note{margin-top:14px;font-size:12.5px;line-height:1.8;color:#5A6E88}
.footer-cta{margin-top:16px}

.footer-bottom{background:var(--ink);color:#8FA6C2}
.footer-bottom-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:8px 24px;padding-block:16px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
}
.footer-copy,.footer-icp{color:#8FA6C2}
.footer-icp{color:#B9CCE2}
.footer-bottom a{color:#CBD9EC}

@media (min-width:760px){
  .footer-inner{grid-template-columns:1fr 1.5fr}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-contact{grid-column:1 / -1}
}
@media (min-width:1080px){
  .footer-inner{grid-template-columns:1.05fr 1.5fr 1.25fr;align-items:start}
  .footer-contact{grid-column:auto}
  .to-top{right:26px;bottom:28px}
}

/* ---------- 15. 无障碍与减弱动效 ---------- */
@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;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .tile:hover,.tile:focus-visible{transform:none}
  .scroll-progress{transition:none}
}