/* ============================================================
   WILLIAMHILL 中文资料站 · 共享样式 /assets/site.css
   主题：档案库房 + 电子索引
   ============================================================ */

/* ---------- reset ---------- */
*,
*::before,
*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
address{font-style:normal}
:focus-visible{outline:3px solid var(--orange);outline-offset:3px}

/* ---------- tokens ---------- */
:root{
  --green-900:#0B3D2E;
  --green-700:#145A45;
  --mint:#2FE0B0;
  --mint-100:#D9F7EE;
  --sand:#F4EDE1;
  --cream:#FCF8F1;
  --orange:#E8642C;
  --amber:#F3A43B;
  --ink:#1E1C18;
  --ink-soft:#6F6A60;
  --brown:#2A211A;
  --line-green:#A8C7BB;
  --rule:rgba(30,28,24,.16);
  --rule-light:rgba(252,248,241,.22);
  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --shell:1280px;
  --gutter:clamp(18px,4vw,56px);
  --header-h:100px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- base ---------- */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:clamp(16px,1.05vw,17px);
  line-height:1.75;
  color:var(--ink);
  background-color:var(--sand);
  background-image:
    radial-gradient(1100px 520px at 92% -8%, rgba(217,247,238,.75), rgba(217,247,238,0) 62%),
    radial-gradient(880px 460px at -8% 4%, rgba(252,248,241,.95), rgba(252,248,241,0) 58%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
::selection{background:var(--mint);color:var(--green-900)}
#main-content{
  display:block;
  padding-top:calc(var(--header-h) + 12px);
  scroll-margin-top:calc(var(--header-h) + 8px);
}
body[data-hero="overlay"] #main-content{padding-top:0}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-weight:800;line-height:1.18;letter-spacing:-.02em}
.display{
  font-size:clamp(2.7rem,7vw,5.6rem);
  font-weight:900;
  line-height:.94;
  letter-spacing:-.045em;
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.08em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--green-700);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--orange)}
.lede{
  max-width:64ch;
  font-size:clamp(17px,1.6vw,20px);
  line-height:1.72;
  color:#3A352D;
}
.prose{max-width:68ch}
.prose p + p{margin-top:1em}

/* ---------- layout ---------- */
.shell{
  width:min(var(--shell),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}
.section{padding-block:clamp(36px,6vw,72px)}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:clamp(12px,3vw,32px);
  flex-wrap:wrap;
  padding-bottom:14px;
  border-bottom:1px dashed var(--rule);
  margin-bottom:clamp(20px,3vw,34px);
}
.grid{display:grid;gap:clamp(18px,3vw,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(0,1.55fr) minmax(0,1fr)}

/* ---------- surfaces ---------- */
.card{
  position:relative;
  background:var(--cream);
  border:1px solid var(--rule);
  padding:clamp(18px,2.4vw,28px);
  clip-path:polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}
.cut-panel{
  background:var(--cream);
  border:1px solid var(--rule);
  clip-path:polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 0 100%);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--green-900);
  background:var(--mint-100);
  border:1px solid rgba(11,61,46,.14);
  clip-path:polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 0 100%);
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  font-size:14px;
  font-weight:700;
  line-height:1;
  letter-spacing:.01em;
  border:1px solid transparent;
  clip-path:polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--sm{padding:8px 12px;font-size:12px}
.btn--solid{background:var(--green-900);color:var(--cream)}
.btn--solid:hover{background:var(--green-700)}
.btn--signal{background:var(--orange);color:#fff}
.btn--signal:hover{background:#CF5320}
.btn--mint{background:var(--mint);color:var(--green-900)}
.btn--mint:hover{background:#25C79C}
.btn--ghost{background:transparent;border-color:currentColor;color:inherit}
.btn--ghost:hover{background:rgba(11,61,46,.08)}

/* ---------- breadcrumbs ---------- */
.crumbs{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ink-soft);
}
.crumbs a{color:var(--green-700);border-bottom:1px solid transparent}
.crumbs a:hover{border-bottom-color:currentColor}
.crumbs span[aria-hidden="true"]{color:var(--line-green)}
.crumbs [aria-current="page"]{color:var(--ink)}

/* ---------- media frames ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  aspect-ratio:4 / 3;
  background:
    linear-gradient(135deg, rgba(217,247,238,.9), rgba(244,237,225,.9));
  border:1px solid rgba(11,61,46,.16);
  clip-path:polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-caption{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-soft);
}

/* ---------- filters ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:8px}
.filter-btn{
  padding:8px 14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--green-900);
  background:var(--cream);
  border:1px solid rgba(11,61,46,.2);
  clip-path:polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.filter-btn:hover{background:var(--mint-100);border-color:var(--green-700)}
.filter-btn[aria-pressed="true"]{background:var(--green-900);color:var(--mint);border-color:var(--green-900)}
.is-filtered-out{display:none !important}

/* ---------- reveal ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  padding:10px 16px;
  font-size:14px;
  font-weight:700;
  color:var(--cream);
  background:var(--green-900);
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* ---------- header ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:90;
  color:var(--green-900);
  background:rgba(252,248,241,.78);
  -webkit-backdrop-filter:blur(10px) saturate(120%);
  backdrop-filter:blur(10px) saturate(120%);
  border-bottom:1px solid rgba(11,61,46,.14);
  transition:background-color .35s var(--ease),color .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
.site-header[data-solid="true"]{
  color:var(--cream);
  background:var(--green-900);
  border-bottom-color:rgba(47,224,176,.35);
  box-shadow:0 20px 44px -30px rgba(11,61,46,.95);
}
.header-rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:28px;
  padding:6px var(--gutter);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--green-700);
  border-bottom:1px dashed rgba(11,61,46,.22);
  transition:color .35s var(--ease),border-color .35s var(--ease);
}
.site-header[data-solid="true"] .header-rail{
  color:var(--mint);
  border-bottom-color:rgba(217,247,238,.22);
}
.rail-id{margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rail-scale{display:flex;align-items:center;gap:0;margin:0;white-space:nowrap}
.rail-scale span{position:relative;padding-left:14px}
.rail-scale span::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:6px;
  height:1px;
  background:var(--orange);
}
.rail-scale span:first-child{padding-left:0}
.rail-scale span:first-child::before{display:none}
.header-inner{
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(16px,3vw,40px);
  min-height:72px;
  padding:10px var(--gutter);
}
.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  display:inline-grid;
  place-items:center;
  flex:0 0 auto;
  width:40px;
  height:40px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--mint);
  background:var(--green-900);
  clip-path:polygon(0 0, calc(100% - 11px) 0, 100% 11px, 100% 100%, 0 100%);
  transition:background-color .35s var(--ease),color .35s var(--ease);
}
.site-header[data-solid="true"] .brand-mark{background:var(--mint);color:var(--green-900)}
.brand-text{display:flex;flex-direction:column;min-width:0;line-height:1.2}
.brand-name{
  font-size:17px;
  font-weight:800;
  letter-spacing:-.02em;
  white-space:nowrap;
}
.brand-tag{
  margin-top:4px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--ink-soft);
  transition:color .35s var(--ease);
}
.site-header[data-solid="true"] .brand-tag{color:rgba(217,247,238,.72)}
.nav{display:flex;justify-content:center;min-width:0}
.nav-list{
  display:flex;
  align-items:center;
  justify-content:center;
  flex-wrap:wrap;
  gap:clamp(6px,1.5vw,22px);
}
.nav-link{
  position:relative;
  display:inline-block;
  padding:8px 2px;
  font-size:14.5px;
  font-weight:600;
  color:inherit;
  transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:2px;
  height:2px;
  background:var(--orange);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--green-700)}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--green-700)}
.site-header[data-solid="true"] .nav-link{color:rgba(252,248,241,.88)}
.site-header[data-solid="true"] .nav-link:hover,
.site-header[data-solid="true"] .nav-link[aria-current="page"]{color:var(--mint)}
.site-header[data-solid="true"] .nav-link::after{background:var(--mint)}
.header-tools{display:flex;align-items:center;gap:8px}
.site-header[data-solid="true"] .btn--ghost:hover{background:rgba(47,224,176,.14)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 12px;
  color:inherit;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.12em;
  border:1px solid currentColor;
  background:transparent;
}
.nav-toggle-bar{position:relative;display:block;width:16px;height:2px;background:currentColor;transition:background-color .2s var(--ease)}
.nav-toggle-bar::before,
.nav-toggle-bar::after{
  content:"";
  position:absolute;
  left:0;
  width:16px;
  height:2px;
  background:currentColor;
  transition:transform .25s var(--ease),top .25s var(--ease);
}
.nav-toggle-bar::before{top:-5px}
.nav-toggle-bar::after{top:5px}
[data-open="true"] .nav-toggle-bar{background:transparent}
[data-open="true"] .nav-toggle-bar::before{top:0;transform:rotate(45deg)}
[data-open="true"] .nav-toggle-bar::after{top:0;transform:rotate(-45deg)}
.nav-toggle-text{line-height:1}
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter-fill{
  display:block;
  height:100%;
  background:linear-gradient(90deg,var(--mint),var(--orange));
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .08s linear;
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,10vw,140px);
  color:var(--cream);
  background:var(--green-900);
  border-top:2px solid var(--mint);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:18px;
  background:repeating-linear-gradient(90deg,rgba(47,224,176,.55) 0 1px,transparent 1px 80px);
  pointer-events:none;
}
.footer-inner{padding-top:clamp(44px,6vw,76px)}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.25fr;
  gap:clamp(24px,4vw,56px);
}
.footer-mark{
  display:inline-grid;
  place-items:center;
  width:54px;
  height:54px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:18px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--green-900);
  background:var(--mint);
  clip-path:polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}
.footer-title{
  font-size:20px;
  font-weight:800;
  letter-spacing:-.02em;
  color:var(--cream);
}
.footer-tag{
  margin-top:6px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  color:var(--mint);
}
.footer-note{
  margin-top:14px;
  max-width:36ch;
  font-size:14px;
  line-height:1.7;
  color:rgba(252,248,241,.68);
}
.col-title{
  margin-bottom:14px;
  padding-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mint);
  border-bottom:1px solid rgba(217,247,238,.18);
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 0;
  font-size:14.5px;
  color:rgba(252,248,241,.86);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link::before{
  content:"";
  width:8px;
  height:1px;
  background:currentColor;
  opacity:.5;
}
.footer-link:hover{color:var(--mint);transform:translateX(2px)}
.footer-contact{display:flex;flex-direction:column;gap:4px}
.contact-line{
  display:grid;
  grid-template-columns:52px minmax(0,1fr);
  gap:10px;
  padding:4px 0;
  font-size:13.5px;
  line-height:1.65;
}
.contact-label{
  padding-top:3px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mint);
}
.contact-value{color:rgba(252,248,241,.85);word-break:break-word}
.footer-feedback{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:16px;
  margin-top:clamp(30px,5vw,52px);
  padding:18px clamp(18px,2.5vw,26px);
  background:rgba(232,100,44,.12);
  border-left:3px solid var(--orange);
  clip-path:polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}
.feedback-body{
  max-width:62ch;
  font-size:14.5px;
  line-height:1.7;
  color:rgba(252,248,241,.92);
}
.footer-bottom{
  margin-top:clamp(32px,5vw,56px);
  background:var(--brown);
  border-top:1px solid rgba(217,247,238,.14);
}
.footer-bottom-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px 20px;
  padding-block:15px;
  font-size:12.5px;
  letter-spacing:.02em;
  color:rgba(252,248,241,.62);
}
.footer-copy,.footer-icp{margin:0}
.footer-icp{font-family:var(--font-mono);letter-spacing:.08em}
.site-footer :focus-visible{outline-color:var(--mint)}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .header-tools .btn--ghost{display:none}
  .brand-tag{display:none}
}
@media (max-width:980px){
  :root{--header-h:90px}
  .header-rail{min-height:26px;font-size:10px;letter-spacing:.16em}
  .header-inner{grid-template-columns:1fr auto;gap:12px;min-height:64px}
  .brand{grid-column:1}
  .header-tools{grid-column:2}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;
    left:0;
    right:0;
    top:var(--header-h);
    display:block;
    padding:10px var(--gutter) 26px;
    max-height:calc(100dvh - var(--header-h));
    overflow-y:auto;
    color:var(--cream);
    background:var(--green-900);
    border-top:1px solid rgba(47,224,176,.35);
    border-bottom:1px solid rgba(47,224,176,.35);
    box-shadow:0 30px 60px -30px rgba(0,0,0,.6);
    opacity:0;
    visibility:hidden;
    pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s;
  }
  .site-header[data-open="true"] .nav{
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
  }
  .nav-list{display:block}
  .nav-item{border-bottom:1px solid rgba(217,247,238,.14)}
  .nav-link{display:block;padding:15px 2px;font-size:17px;color:var(--cream)}
  .nav-link::after{display:none}
  .nav-link:hover{color:var(--mint)}
  .nav-link[aria-current="page"]{color:var(--mint)}
  .nav-link[aria-current="page"]::before{
    content:"";
    display:inline-block;
    width:8px;
    height:8px;
    margin-right:10px;
    vertical-align:middle;
    background:var(--orange);
    clip-path:polygon(0 0, 100% 0, 100% 100%, 0 100%);
  }
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:880px){
  .grid--asym{grid-template-columns:1fr}
}
@media (max-width:820px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:700px){
  .grid--2,
  .grid--3,
  .grid--asym{grid-template-columns:1fr}
}
@media (max-width:640px){
  .header-tools .btn--signal{display:none}
  .brand-name{font-size:15px;white-space:normal}
  .brand-mark{width:36px;height:36px;font-size:12px}
  .footer-grid{grid-template-columns:1fr}
  .footer-feedback{align-items:flex-start;flex-direction:column}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start}
  .contact-line{grid-template-columns:46px minmax(0,1fr)}
}
@media (max-width:420px){
  .nav-toggle-text{display:none}
  .rail-scale{display:none}
}

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