/* ==========================================================================
   金年会看台 / assets/site.css
   共享外壳：reset · 变量 · 中文排版 · 头部 · 页脚 · 通用组件
   ========================================================================== */

/* --- 01 reset ----------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0}
img,picture,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
ul,ol{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
table{border-collapse:collapse}

/* --- 02 变量 ------------------------------------------------------------ */
:root{
  --paper:#F4EFE4;
  --paper-raised:#E7DFCE;
  --ink:#15171B;
  --ink-body:#343A40;
  --line:#8E9189;
  --line-soft:rgba(142,145,137,.42);
  --amber:#E3A03A;
  --sea:#1C6A6D;
  --sea-mist:#86BDB4;
  --red:#C33327;
  --night:#20272E;
  --on-night:rgba(244,239,228,.78);
  --on-night-strong:#F4EFE4;

  --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;

  --shell:1240px;
  --gutter:clamp(20px,5vw,64px);
  --header-h:68px;

  --sp-1:8px;
  --sp-2:16px;
  --sp-3:24px;
  --sp-4:32px;
  --sp-5:48px;
  --sp-6:64px;
  --sp-7:96px;

  --ease:cubic-bezier(.22,.61,.36,1);
}
@media (min-width:900px){ :root{ --header-h:88px; } }

/* --- 03 中文排版基座 ---------------------------------------------------- */
body{
  padding-top:var(--header-h);
  background:var(--paper);
  color:var(--ink-body);
  font-family:var(--font-sans);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
main{display:block}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}
#main-content:focus{outline:none}

.display{
  font-family:var(--font-sans);
  font-weight:300;
  font-size:clamp(48px,9vw,132px);
  line-height:.98;
  letter-spacing:-.02em;
  color:var(--ink);
}
.section-title{
  font-family:var(--font-sans);
  font-weight:300;
  font-size:clamp(30px,4.4vw,58px);
  line-height:1.06;
  letter-spacing:-.015em;
  color:var(--ink);
}
.heading{
  font-size:clamp(19px,2vw,25px);
  font-weight:500;
  line-height:1.4;
  color:var(--ink);
}
.label-mono{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  line-height:1.6;
  color:var(--line);
}
.num,.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
}
.num{font-weight:700;color:var(--ink)}
.muted{color:var(--line)}
.prose{color:var(--ink-body);max-width:36em}
.prose p{font-size:17px;line-height:1.85;margin-bottom:1.1em;max-width:34em}
.prose p+p{margin-top:0}
.prose strong{color:var(--ink);font-weight:600}
.prose h2{font-size:clamp(24px,3vw,34px);font-weight:300;color:var(--ink);line-height:1.2;margin:2em 0 .8em;letter-spacing:-.01em}
.prose h3{font-size:19px;font-weight:500;color:var(--ink);margin:1.6em 0 .6em}
.link{color:var(--sea);border-bottom:1px solid var(--sea-mist);transition:color .2s var(--ease),border-color .2s var(--ease)}
.link:hover,.link:focus-visible{color:var(--ink);border-bottom-color:var(--ink)}

/* --- 04 容器与网格 ------------------------------------------------------ */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:var(--sp-2);
}
@media (min-width:700px){
  .grid-12{grid-template-columns:repeat(8,minmax(0,1fr));gap:var(--sp-3)}
}
@media (min-width:1024px){
  .grid-12{grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--sp-4)}
}
.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:1 / -1}
@media (min-width:700px){
  .col-4,.col-5,.col-6{grid-column:span 4}
  .col-7,.col-8,.col-12{grid-column:span 8}
}
@media (min-width:1024px){
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
  .col-12{grid-column:span 12}
}
.stack>*+*{margin-top:var(--sp-3)}
.hairline-top{border-top:1px solid var(--line-soft)}

/* --- 05 区块 ------------------------------------------------------------ */
.section{padding-block:clamp(56px,9vw,132px)}
.section--tight{padding-block:clamp(32px,5vw,72px)}
.section--raised{background:var(--paper-raised)}
.section--night{background:var(--night);color:var(--on-night)}
.section--night .section-title,
.section--night .heading,
.section--night .display{color:var(--on-night-strong)}
.section--night .label-mono,
.section--night .stat-label,
.section--night .card-text{color:rgba(244,239,228,.62)}
.section--night .rule{background:rgba(244,239,228,.2)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px 24px;
  margin-bottom:clamp(24px,4vw,56px);
}
.section-index{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--amber);
}
.section-lead{
  max-width:38em;
  margin-top:var(--sp-2);
  font-size:16px;
  line-height:1.8;
  color:var(--ink-body);
}
.rule{height:1px;border:0;margin:0;background:var(--line-soft)}
.rule--ink{background:var(--ink)}

/* --- 06 头部 ------------------------------------------------------------ */
.skip-link{
  position:fixed;
  top:10px;
  left:10px;
  z-index:200;
  transform:translateY(-180%);
  padding:10px 16px;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  transition:transform .22s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none;outline:2px solid var(--amber);outline-offset:2px}

.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:60;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color .3s var(--ease),border-color .3s var(--ease);
}
.site-header.is-pinned{
  background:var(--paper);
  border-bottom-color:var(--line-soft);
}
.site-header[data-nav-open="true"]{
  background:var(--night);
  border-bottom-color:rgba(244,239,228,.2);
}
.site-header[data-nav-open="true"] .brand,
.site-header[data-nav-open="true"] .brand-mark{color:var(--on-night-strong)}
.site-header[data-nav-open="true"] .nav-toggle{color:var(--on-night-strong);border-color:rgba(244,239,228,.36)}
.site-header[data-nav-open="true"] .nav-toggle-bars span{background:var(--on-night-strong)}

.header-shell{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,28px);
  height:var(--header-h);
  transition:height .3s var(--ease);
}
.site-header.is-pinned .header-shell{height:64px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--ink);
}
.brand-mark{display:inline-flex;align-items:center;color:var(--ink)}
.brand-mark svg{width:28px;height:28px}
.brand-mark-dot{fill:var(--amber)}
.brand-name{
  font-size:17px;
  font-weight:500;
  letter-spacing:.08em;
  color:inherit;
  white-space:nowrap;
}

.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:9px 12px;
  border:1px solid var(--line-soft);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:1px;width:100%;background:var(--ink);transition:transform .24s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(2.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-2.5px) rotate(-45deg)}
.nav-toggle-text{white-space:nowrap}

.header-cta{
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  padding:10px 14px;
  background:var(--amber);
  border:1px solid var(--amber);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  white-space:nowrap;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.header-cta:hover,.header-cta:focus-visible{background:var(--ink);border-color:var(--ink);color:var(--amber)}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:var(--amber);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}

/* 导航：移动端为深色全屏面板 */
.site-nav{
  position:fixed;
  left:0;right:0;
  top:var(--header-h);
  bottom:0;
  display:block;
  padding:clamp(20px,6vw,44px) var(--gutter) 80px;
  background:var(--night);
  color:var(--on-night-strong);
  overflow-y:auto;
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transform:translateY(-10px);
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility 0s linear .26s;
}
.site-nav[data-open="true"]{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:none;
  transition:opacity .26s var(--ease),transform .26s var(--ease),visibility 0s linear 0s;
}
.nav-list{display:flex;flex-direction:column}
.nav-item{border-bottom:1px solid rgba(244,239,228,.16)}
.nav-link{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:18px 0;
  color:var(--on-night-strong);
  font-size:20px;
  font-weight:300;
  letter-spacing:.04em;
  transition:color .2s var(--ease)
}
.nav-idx{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--amber);
}
.nav-link[aria-current="page"]{color:var(--amber)}
body[data-nav-open="true"]{overflow:hidden}

@media (min-width:900px){
  .nav-toggle{display:none}
  .site-nav{
    position:static;
    margin-left:auto;
    opacity:1;
    visibility:visible;
    pointer-events:auto;
    transform:none;
    background:transparent;
    color:inherit;
    padding:0;
    overflow:visible;
    transition:none;
  }
  .nav-list{flex-direction:row;align-items:center;gap:clamp(12px,2.2vw,30px)}
  .nav-item{border-bottom:0}
  .nav-link{
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:6px 0;
    position:relative;
    color:var(--ink-body);
    font-family:var(--font-mono);
    font-size:12px;
    font-weight:400;
    letter-spacing:.14em;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:0;right:0;bottom:0;
    height:2px;
    background:var(--amber);
    transform:scaleX(0);
    transform-origin:0 50%;
    transition:transform .24s var(--ease);
  }
  .nav-link:hover{color:var(--ink)}
  .nav-link:hover::after{transform:scaleX(1)}
  .nav-link[aria-current="page"]{color:var(--ink)}
  .nav-link[aria-current="page"]::after{transform:scaleX(1)}
}
@media (min-width:1180px){
  .nav-idx{font-size:9px;opacity:.75}
}

/* --- 07 页脚 ------------------------------------------------------------ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,132px);
  padding-block:calc(clamp(56px,8vw,104px) + 36px) 0;
  background:var(--night);
  color:var(--on-night);
  clip-path:polygon(0 6%,100% 0,100% 100%,0 100%);
}
.footer-shell{position:relative}
.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(32px,5vw,64px);
}
@media (min-width:760px){
  .footer-grid{grid-template-columns:1.35fr 1fr 1.15fr}
}
.footer-mark{display:inline-flex;color:var(--amber)}
.footer-mark-dot{fill:var(--amber)}
.footer-name{
  margin-top:16px;
  font-size:22px;
  font-weight:300;
  letter-spacing:.08em;
  color:var(--on-night-strong);
}
.footer-line{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--sea-mist);
}
.footer-note{
  margin-top:18px;
  max-width:30em;
  font-size:14px;
  line-height:1.8;
  color:rgba(244,239,228,.6);
}
.footer-heading{
  margin-bottom:18px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--amber);
}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-link{
  display:inline-block;
  color:#E7DFCE;
  font-size:15px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--amber);border-bottom-color:var(--amber)}
.footer-contact{display:flex;flex-direction:column;gap:16px}
.footer-contact-item{font-size:14px;line-height:1.7;color:rgba(244,239,228,.8);word-break:break-word}
.footer-contact-key{
  display:block;
  margin-bottom:2px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--sea-mist);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:clamp(40px,6vw,72px);
  padding-block:24px 36px;
  border-top:1px solid rgba(244,239,228,.18);
}
.footer-legal{display:flex;align-items:center;gap:12px;font-size:14px}
.footer-sep{color:rgba(244,239,228,.3)}
.footer-meta{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:rgba(244,239,228,.5);
}
.grain-layer{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  z-index:80;
  opacity:.05;
  mix-blend-mode:multiply;
  pointer-events:none;
}

/* --- 08 图形与容器 ------------------------------------------------------ */
.figure-block{display:block}
.figure-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--paper-raised);
  border:1px solid var(--line-soft);
}
.figure-frame img,
.figure-graphic{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.figure-frame--wide{aspect-ratio:16/9}
.figure-frame--tall{aspect-ratio:4/5}
.figure-frame--square{aspect-ratio:1/1}
.figure-frame--strip{aspect-ratio:21/9}
.figure-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--line);
}
.angle-band{
  height:clamp(56px,10vw,140px);
  background:var(--amber);
  clip-path:polygon(0 8%,100% 0,100% 92%,0 100%);
}
.angle-band--sea{background:var(--sea)}
.angle-band--night{background:var(--night)}
.angle-band--paper{background:var(--paper-raised)}

/* --- 09 通用组件 -------------------------------------------------------- */
.card{
  background:var(--paper-raised);
  border:1px solid var(--line-soft);
  padding:clamp(20px,2.4vw,32px);
}
.card--paper{background:var(--paper)}
.card--night{background:var(--night);border-color:rgba(244,239,228,.16);color:var(--on-night)}
.card--night .card-title{color:var(--on-night-strong)}
.card--night .card-text{color:rgba(244,239,228,.72)}
.card-meta{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  color:var(--line);
}
.card-title{font-size:19px;font-weight:500;line-height:1.4;color:var(--ink);margin-bottom:8px}
.card-text{font-size:15px;line-height:1.8;color:var(--ink-body)}

.stat-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:var(--sp-3);
}
.stat{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding-top:12px;
  border-top:1px solid var(--ink);
}
.stat-value{
  font-family:var(--font-mono);
  font-weight:700;
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  font-size:clamp(34px,5vw,56px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--ink);
}
.stat-value--amber{color:var(--amber)}
.stat-value--sea{color:var(--sea)}
.stat-value--red{color:var(--red)}
.stat-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--line);
}
.section--night .stat{border-top-color:rgba(244,239,228,.4)}

.legend{display:flex;flex-wrap:wrap;align-items:center;gap:14px 24px}
.legend-item{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--line);
}
.legend-swatch{display:inline-block;width:12px;height:12px;background:var(--amber)}
.legend-swatch--sea{background:var(--sea)}
.legend-swatch--paper{background:var(--paper);border:1px solid var(--line)}
.legend-swatch--red{background:var(--red)}
.legend-swatch--line{background:transparent;border:1px solid var(--line)}

.route-list{border-top:1px solid var(--line-soft)}
.route-item{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:6px 18px;
  padding:18px 0;
  border-bottom:1px solid var(--line-soft);
}
.route-num{
  min-width:36px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:var(--amber);
}
.route-name{font-size:18px;font-weight:400;color:var(--ink)}
.route-note{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--line);
}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 22px;
  border:1px solid var(--ink);
  background:transparent;
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.12em;
  transition:background-color .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease);
}
.btn--solid{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.btn--amber{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.btn--sea{background:var(--sea);border-color:var(--sea);color:var(--paper)}
.btn--ghost{border-color:var(--line);color:var(--ink-body)}
.btn:hover,.btn:focus-visible{background:var(--ink);border-color:var(--ink);color:var(--amber)}
.btn--solid:hover,.btn--solid:focus-visible{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.section--night .btn{border-color:rgba(244,239,228,.5);color:var(--on-night-strong)}
.section--night .btn:hover,.section--night .btn:focus-visible{background:var(--amber);border-color:var(--amber);color:var(--ink)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 12px;
  border:1px solid var(--line-soft);
  background:var(--paper);
  color:var(--ink-body);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
}
.chip--amber{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.chip--sea{background:var(--sea-mist);border-color:var(--sea-mist);color:var(--ink)}

.breadcrumb{padding-top:20px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.16em;
  color:var(--line);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb-link{color:var(--line);transition:color .2s var(--ease)}
.breadcrumb-link:hover,.breadcrumb-link:focus-visible{color:var(--sea)}
.breadcrumb-sep{color:var(--sea-mist)}
.breadcrumb-current{color:var(--ink)}

.vane{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px;
  height:20px;
  color:var(--amber);
  transition:transform .24s var(--ease);
}
.vane svg{width:100%;height:100%}

/* --- 10 动效与工具 ------------------------------------------------------ */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
.reveal.is-visible{opacity:1;transform:none}

.sr-only{
  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;
}

/* --- 11 焦点与降级 ------------------------------------------------------ */
:focus-visible{outline:2px solid var(--sea);outline-offset:3px}
.site-footer :focus-visible,
.section--night :focus-visible,
.site-nav :focus-visible,
.site-header[data-nav-open="true"] :focus-visible{outline-color:var(--amber)}

@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;
  }
  .reveal{opacity:1;transform:none}
  .scroll-progress{transition:none}
}

/* --- 12 小屏微调 -------------------------------------------------------- */
@media (max-width:480px){
  body{font-size:16px}
  .brand-name{font-size:15px;letter-spacing:.04em}
  .brand-mark svg{width:24px;height:24px}
  .header-cta{font-size:11px;padding:9px 10px;letter-spacing:.06em}
  .nav-toggle{padding:9px 10px}
  .nav-toggle-text{display:none}
}