/* =========================================================
   威利斯人登录 · 共享样式表 /assets/site.css
   骨架：12 列非对称网格 · 锐利直角 · 1px 细线 · 跑道导引语言
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#0B1C2C;
  --ink-800:#12314A;
  --paper:#F4EFE3;
  --paper-2:#DED5C0;
  --amber:#E0A33A;
  --amber-deep:#8A5A06;
  --orange:#FF6B2C;
  --celadon:#4E8F7A;
  --black:#10161C;
  --slate:#9AA7B8;

  --line-dark:rgba(154,167,184,.28);
  --line-dark-soft:rgba(154,167,184,.14);
  --line-light:rgba(16,22,28,.16);

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

  --fs-56:56px; --fs-40:40px; --fs-28:28px; --fs-20:20px; --fs-17:17px; --fs-14:14px;

  --pad-left:4%;
  --pad-right:8%;
  --shell-max:1440px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. reset 与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:var(--fs-17);
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,picture,svg,video{display:block;max-width:100%}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
hr{border:0;margin:0}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
::selection{background:var(--amber);color:var(--ink-900)}

/* ---------- 3. 文字层级 ---------- */
.display-1{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(34px,5.2vw,var(--fs-56));
  line-height:1.06;
  letter-spacing:-.02em;
}
.display-2{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(24px,3.2vw,var(--fs-40));
  line-height:1.14;
  letter-spacing:-.015em;
}
.section-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(21px,2.4vw,var(--fs-28));
  line-height:1.24;
  letter-spacing:-.01em;
}
.lede{font-size:clamp(17px,1.6vw,var(--fs-20));line-height:1.7;color:rgba(244,239,227,.82)}
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--amber);
}
.section-num{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.16em;
  color:var(--amber-deep);
}
.section-num::after{content:"";width:44px;height:1px;background:currentColor;opacity:.55}
.chapter-num{
  font-family:var(--font-mono);
  font-size:clamp(38px,5vw,var(--fs-56));
  line-height:1;
  color:var(--amber);
  letter-spacing:-.01em;
}
.prose{max-width:68ch}
.prose p{margin-bottom:1.2em}
.prose p:last-child{margin-bottom:0}
.prose strong{color:var(--amber-deep)}

/* ---------- 4. 布局 ---------- */
.container{
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding-left:var(--pad-left);
  padding-right:var(--pad-right);
}
.section{padding:clamp(44px,6.4vw,96px) 0}
.section--tight{padding:clamp(28px,3.6vw,56px) 0}
.section--paper{background:var(--paper);color:var(--black)}
.section--paper .lede{color:rgba(16,22,28,.72)}
.section--paper .eyebrow{color:var(--amber-deep)}
.section--paper .section-num{color:var(--amber-deep)}
.section--paper .section-title{color:var(--black)}
.section--paper :focus-visible{outline-color:var(--amber-deep)}
.section--ink{background:var(--ink-900);color:var(--paper)}
.section--panel{background:var(--ink-800);color:var(--paper)}
.band{
  background:var(--ink-800);
  border-top:1px solid var(--line-dark);
  border-bottom:1px solid var(--line-dark);
}
.divider{height:1px;background:var(--line-light);border:0}
.divider--ink{background:var(--line-dark)}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,38fr) minmax(0,62fr);gap:clamp(24px,4vw,64px)}
.grid--asym-rev{grid-template-columns:minmax(0,62fr) minmax(0,38fr);gap:clamp(24px,4vw,64px)}
.stack{display:flex;flex-direction:column;gap:14px}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:var(--fs-14);
  letter-spacing:.05em;
  line-height:1.2;
  white-space:nowrap;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn-primary{background:var(--amber);color:var(--ink-900);font-weight:700}
.btn-primary:hover{background:var(--orange);color:#fff}
.btn-ghost{border-color:var(--line-dark);color:var(--paper);background:rgba(11,28,44,.4)}
.btn-ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn-line{border-color:var(--line-light);color:var(--black)}
.btn-line:hover{border-color:var(--amber-deep);color:var(--amber-deep)}

/* ---------- 6. 标签 / 卡片 / 状态 ---------- */
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-light);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--black);
}
.section--ink .chip,.section--panel .chip,.site-footer .chip{border-color:var(--line-dark);color:var(--paper)}
.chip--amber{border-color:var(--amber);color:var(--amber-deep)}
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.card{
  background:var(--paper);
  color:var(--black);
  border:1px solid var(--line-light);
  border-radius:2px;
  padding:clamp(18px,2vw,26px);
}
.card--ink{
  background:var(--ink-800);
  color:var(--paper);
  border-color:var(--line-dark);
}
.card-title{
  font-family:var(--font-display);
  font-weight:800;
  font-size:var(--fs-20);
  line-height:1.3;
  letter-spacing:-.01em;
  margin-bottom:8px;
}
.status-dot{
  display:inline-block;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--slate);
  transition:background-color .2s var(--ease);
}
.status-dot.is-fresh{background:var(--celadon);box-shadow:0 0 0 3px rgba(78,143,122,.2)}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--slate);
}
.breadcrumb a{color:var(--slate)}
.breadcrumb a:hover{color:var(--amber)}
.breadcrumb li::after{content:"/";margin-left:10px;opacity:.5}
.breadcrumb li:last-child::after{content:"";margin:0}
.section--paper .breadcrumb,.section--paper .breadcrumb a{color:rgba(16,22,28,.6)}
.section--paper .breadcrumb a:hover{color:var(--amber-deep)}

/* ---------- 8. 图片容器（页面阶段放置图片） ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line-dark);
  border-radius:2px;
  background:
    linear-gradient(140deg,var(--ink-800) 0%,var(--ink-900) 70%),
    repeating-linear-gradient(115deg,rgba(224,163,58,.16) 0 1px,transparent 1px 22px);
}
.media-frame > img,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--paper{
  border-color:var(--line-light);
  background:
    linear-gradient(140deg,var(--paper) 0%,var(--paper-2) 100%),
    repeating-linear-gradient(115deg,rgba(16,22,28,.07) 0 1px,transparent 1px 20px);
}
.caption{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--slate);
}
.section--paper .caption{color:rgba(16,22,28,.6)}

/* ---------- 9. 可展开内容组 ---------- */
.accordion{border-top:1px solid var(--line-dark)}
.section--paper .accordion{border-top-color:var(--line-light)}
.accordion-item{border-bottom:1px solid var(--line-dark)}
.section--paper .accordion-item{border-bottom-color:var(--line-light)}
.accordion-trigger{
  display:flex;
  align-items:flex-start;
  gap:14px;
  width:100%;
  padding:16px 0;
  text-align:left;
  font-family:var(--font-display);
  font-weight:800;
  font-size:var(--fs-17);
  letter-spacing:0;
  color:inherit;
}
.accordion-trigger::before{
  content:"+";
  flex:none;
  width:22px;
  font-family:var(--font-mono);
  font-weight:400;
  font-size:18px;
  line-height:1.4;
  color:var(--amber);
  transition:transform .2s var(--ease),color .2s var(--ease);
}
.accordion-trigger[aria-expanded="true"]::before{content:"–";color:var(--orange)}
.accordion-trigger:hover{color:var(--amber)}
.accordion-panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .24s var(--ease);
}
.accordion-panel[data-open]{grid-template-rows:1fr}
.accordion-body{
  overflow:hidden;
  opacity:0;
  transition:opacity .22s var(--ease);
  color:rgba(244,239,227,.78);
}
.section--paper .accordion-body{color:rgba(16,22,28,.78)}
.accordion-panel[data-open] > .accordion-body{opacity:1}
.accordion-body > *{padding-bottom:14px}
.accordion-body > *:last-child{padding-bottom:20px}

/* ---------- 10. 显现基础 ---------- */
[data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .28s var(--ease),transform .28s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--pad-left);
  top:-60px;
  z-index:120;
  padding:10px 16px;
  background:var(--amber);
  color:var(--ink-900);
  font-size:var(--fs-14);
  font-weight:700;
  border-radius:2px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:10px}

/* ---------- 12. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink-900);
  border-bottom:1px solid var(--line-dark);
  box-shadow:0 1px 0 rgba(11,28,44,.6);
}
.header-inner{
  position:relative;
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto auto;
  align-items:center;
  gap:clamp(14px,2.4vw,40px);
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:12px var(--pad-right) 12px var(--pad-left);
}
.header-brand{display:flex;align-items:center}
.brand-link{display:inline-flex;align-items:center;gap:12px;padding:2px 0}
.brand-mark{
  position:relative;
  flex:none;
  width:34px;
  height:34px;
  border:1px solid var(--amber);
  background:rgba(224,163,58,.06);
}
.brand-mark::before{
  content:"";
  position:absolute;
  left:7px;
  top:7px;
  width:10px;
  height:10px;
  background:var(--amber);
}
.brand-mark::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:var(--orange);
}
.brand-copy{display:flex;flex-direction:column;line-height:1.2}
.brand-name{
  font-family:var(--font-display);
  font-weight:800;
  font-size:var(--fs-20);
  letter-spacing:.01em;
  color:var(--paper);
}
.brand-tagline{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--slate);
}
.brand-link:hover .brand-name{color:var(--amber)}

.header-route{
  display:flex;
  align-items:center;
  gap:12px;
  max-width:520px;
  margin-left:clamp(4px,3vw,48px);
  min-width:0;
}
.route-label{
  flex:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--slate);
  white-space:nowrap;
}
.route-track{
  position:relative;
  flex:1 1 auto;
  height:2px;
  background:rgba(154,167,184,.22);
  overflow:visible;
}
.route-fill{
  position:absolute;
  left:0;
  top:0;
  bottom:0;
  width:0;
  background:linear-gradient(90deg,var(--amber),var(--orange));
  transition:width .2s linear;
}
.route-fill::after{
  content:"";
  position:absolute;
  right:-3px;
  top:-3px;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,107,44,.18);
}

.site-nav{display:flex;align-items:center;gap:clamp(14px,2vw,36px);grid-column:3}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.5vw,26px)}
.nav-link{
  position:relative;
  display:inline-block;
  padding:6px 2px;
  font-size:var(--fs-14);
  letter-spacing:.05em;
  color:rgba(244,239,227,.72);
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:100%;
  bottom:0;
  height:2px;
  background:var(--amber);
  transition:right .18s var(--ease);
}
.nav-link:hover{color:var(--paper)}
.nav-link:hover::after{right:0}
.nav-link[aria-current="page"]{color:var(--amber)}
.nav-link[aria-current="page"]::after{right:0;background:var(--orange)}
.nav-actions{display:flex;align-items:center;gap:10px}

.nav-toggle{
  display:none;
  grid-column:4;
  align-items:center;
  gap:8px;
  padding:8px 10px;
  border:1px solid var(--line-dark);
  border-radius:2px;
  color:var(--paper);
}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle-bars span{
  display:block;
  height:2px;
  width:100%;
  background:var(--amber);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-text{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--slate)}

/* ---------- 13. 页脚 ---------- */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--ink-900);
  color:rgba(244,239,227,.8);
  border-top:1px solid var(--line-dark);
}
.site-footer::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:26%;
  height:3px;
  background:linear-gradient(90deg,var(--amber),var(--orange));
}
.site-footer::after{
  content:"";
  position:absolute;
  right:-12%;
  bottom:-45%;
  width:62%;
  height:190%;
  background:repeating-linear-gradient(115deg,rgba(224,163,58,.12) 0 1px,transparent 1px 26px);
  pointer-events:none;
}
.footer-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:minmax(0,38fr) minmax(0,62fr);
  gap:clamp(24px,4vw,64px);
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:clamp(40px,5vw,72px) var(--pad-right) clamp(30px,3.6vw,52px) var(--pad-left);
}
.footer-lead{display:flex;flex-direction:column;gap:14px}
.footer-brand{
  font-family:var(--font-display);
  font-weight:800;
  font-size:var(--fs-20);
  letter-spacing:.02em;
  color:var(--paper);
}
.footer-statement{
  max-width:34ch;
  font-size:var(--fs-14);
  line-height:1.8;
  color:rgba(244,239,227,.72);
}
.footer-contact{display:flex;flex-direction:column;gap:6px;padding-top:6px}
.contact-line{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--slate);
  word-break:break-all;
}
.footer-columns{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.6vw,40px);
}
.footer-col{
  border-top:1px solid var(--line-dark);
  padding-top:14px;
}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--amber);
}
.footer-col-hint{
  margin-top:6px;
  font-size:12px;
  line-height:1.6;
  color:rgba(154,167,184,.9);
}
.footer-links{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.footer-link{
  position:relative;
  display:inline-block;
  font-size:var(--fs-14);
  color:rgba(244,239,227,.8);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link::after{
  content:"→";
  font-family:var(--font-mono);
  font-size:12px;
  margin-left:8px;
  color:var(--orange);
  opacity:0;
  transition:opacity .18s var(--ease),margin-left .18s var(--ease);
}
.footer-link:hover{color:var(--amber)}
.footer-link:hover::after{opacity:1;margin-left:12px}
.footer-base{
  position:relative;
  z-index:1;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 26px;
  width:100%;
  max-width:var(--shell-max);
  margin:0 auto;
  padding:16px var(--pad-right) 22px var(--pad-left);
  border-top:1px solid var(--line-dark);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--slate);
}
.footer-note{flex:1 1 320px;min-width:220px}
.footer-legal,.footer-icp{white-space:nowrap}

/* ---------- 14. 平板 ---------- */
@media (max-width:1180px){
  .header-route{max-width:320px}
  .nav-actions .btn-ghost{display:none}
}
@media (max-width:1080px){
  .header-route{display:none}
}
@media (max-width:980px){
  :root{--pad-left:5%;--pad-right:5%}
  .header-inner{grid-template-columns:auto minmax(0,1fr) auto;gap:12px}
  .nav-toggle{display:inline-flex;justify-self:end}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:block;
    grid-column:1 / -1;
    padding:18px var(--pad-right) 24px var(--pad-left);
    background:var(--ink-800);
    border-top:1px solid var(--line-dark);
    border-bottom:1px solid var(--line-dark);
    box-shadow:0 18px 34px rgba(4,12,20,.5);
    visibility:hidden;
    opacity:0;
    transform:translateY(-6px);
    pointer-events:none;
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .site-nav[data-open]{
    visibility:visible;
    opacity:1;
    transform:none;
    pointer-events:auto;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list li{border-bottom:1px solid var(--line-dark-soft)}
  .nav-link{display:block;padding:13px 0;font-size:var(--fs-17)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{padding-left:12px;border-left:2px solid var(--orange)}
  .nav-actions{flex-wrap:wrap;gap:10px;margin-top:18px}
  .nav-actions .btn-ghost{display:inline-flex}
  .nav-actions .btn{flex:1 1 160px;justify-content:center}
  .grid--asym,.grid--asym-rev{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 15. 手机 ---------- */
@media (max-width:760px){
  body{font-size:16px;line-height:1.72}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-inner{grid-template-columns:minmax(0,1fr);padding-top:44px}
  .footer-columns{grid-template-columns:minmax(0,1fr);gap:20px}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px}
  .footer-legal,.footer-icp{white-space:normal}
  .brand-tagline{display:none}
  .brand-mark{width:30px;height:30px}
}
@media (max-width:420px){
  .nav-toggle-text{display:none}
  .chapter-num{font-size:34px}
}

/* ---------- 16. 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;
  }
  [data-reveal]{opacity:1;transform:none}
  .route-fill{transition:none}
}