/* ===== 00 reset ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
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}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}

/* ===== 01 tokens ===== */
:root{
  --ink:#10171C;
  --paper:#F5EFE3;
  --paper-2:#EAE0CE;
  --teal:#0F4A52;
  --teal-2:#4E8F94;
  --crimson:#A32A28;
  --gold:#E4B23C;
  --nav-green:#2C463C;
  --help-blue:#6F8798;
  --grid:#C6B79E;
  --rail-w:76px;
  --bar-h:62px;
  --wrap:1180px;
  --shot:8px 8px 0 rgba(16,23,28,.12);
  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ===== 02 base ===== */
body{
  font-family:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  font-size:17px;line-height:1.7;color:var(--ink);
  background-color:var(--paper);
  background-image:
    linear-gradient(to right,rgba(198,183,158,.34) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(198,183,158,.34) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
h1,h2,h3,h4{font-weight:900;line-height:1.1;letter-spacing:-.02em}
h1{font-size:clamp(34px,6vw,68px)}
h2{font-size:clamp(26px,4vw,44px)}
h3{font-size:20px;line-height:1.3}
strong{font-weight:900}

/* ===== 03 layout ===== */
.wrap{width:min(var(--wrap),100% - 40px);margin-inline:auto}
.section{padding-block:64px}
.section__head{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px 16px;border-bottom:2px solid var(--ink);padding-bottom:12px;margin-bottom:28px}
.section__index{font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--crimson)}
.section__title{font-size:clamp(22px,3vw,30px);font-weight:900;letter-spacing:-.01em}
.section__note{margin-left:auto;font-size:12px;letter-spacing:.1em;color:var(--teal-2)}
.lede{font-size:clamp(18px,2.2vw,21px);line-height:1.65;max-width:28em;color:var(--ink)}
.prose{max-width:34em;font-size:16px;line-height:1.75;color:rgba(16,23,28,.82)}
.prose p + p{margin-top:14px}
.rule{border:0;border-top:2px solid var(--ink);margin:0}
.rule--grid{border-top:1px solid var(--grid)}
.annot{font-size:11px;letter-spacing:.2em;color:var(--grid);writing-mode:vertical-rl;text-orientation:mixed}
.coords{font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--teal-2)}
.grid{display:grid;gap:24px;grid-template-columns:repeat(12,minmax(0,1fr))}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ===== 04 buttons ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:11px 20px;
  font-size:14px;font-weight:900;letter-spacing:.06em;line-height:1.2;
  background:var(--paper);color:var(--ink);
  border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease;
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--ink)}
.btn:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:var(--ink)}
.btn--crimson{background:var(--crimson);color:var(--paper);border-color:var(--ink)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink);box-shadow:none}
.btn--ghost:hover{background:var(--paper-2);box-shadow:4px 4px 0 var(--ink)}
.btn--block{display:flex;width:100%}

/* ===== 05 tags ===== */
.tag{display:inline-flex;align-items:center;gap:6px;padding:3px 9px;font-size:12px;font-weight:700;letter-spacing:.08em;line-height:1.4;border:1px solid var(--ink);background:var(--paper-2);color:var(--ink)}
.tag--crimson{background:var(--crimson);color:var(--paper);border-color:var(--crimson)}
.tag--teal{background:var(--teal);color:var(--paper);border-color:var(--teal)}
.tag--gold{background:var(--gold);color:var(--ink);border-color:var(--ink)}
.tag--blue{background:var(--help-blue);color:var(--paper);border-color:var(--help-blue)}

/* ===== 06 panels & frames ===== */
.panel{position:relative;padding:26px 22px 24px;background:var(--paper);border:2px solid var(--ink);box-shadow:var(--shot)}
.panel--paper2{background:var(--paper-2)}
.panel--dark{background:var(--ink);color:var(--paper)}
.panel--dark .panel__body{color:rgba(245,239,227,.76)}
.panel__index{position:absolute;top:-2px;left:-2px;padding:4px 9px;background:var(--ink);color:var(--gold);font-family:var(--mono);font-size:11px;letter-spacing:.16em}
.panel--dark .panel__index{background:var(--gold);color:var(--ink)}
.panel__title{font-size:20px;font-weight:900;line-height:1.28;margin-bottom:8px}
.panel__body{font-size:15px;line-height:1.7;color:rgba(16,23,28,.78)}
.frame{position:relative;border:2px solid var(--ink);background:var(--paper);box-shadow:var(--shot);padding:26px}
.frame::before,.frame::after{content:"";position:absolute;width:10px;height:10px}
.frame::before{top:-2px;left:-2px;background:var(--gold)}
.frame::after{bottom:-2px;right:-2px;background:var(--crimson)}

/* ===== 07 media ===== */
.media{position:relative;overflow:hidden;aspect-ratio:16/9;border:2px solid var(--ink);background:var(--ink)}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.05)}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media__cap{position:absolute;left:0;bottom:0;padding:5px 10px;background:rgba(16,23,28,.84);color:var(--paper);font-size:11px;letter-spacing:.14em}
.media__placeholder{display:grid;place-items:center;height:100%;color:rgba(245,239,227,.46);font-size:12px;letter-spacing:.24em}

/* ===== 08 crumbs ===== */
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:10px;padding-block:18px;font-size:12px;letter-spacing:.1em;color:var(--teal-2)}
.crumbs a{border-bottom:1px solid var(--grid);transition:color .18s ease,border-color .18s ease}
.crumbs a:hover{color:var(--crimson);border-bottom-color:var(--crimson)}
.crumbs__sep{color:var(--grid)}
.crumbs__here{font-weight:900;color:var(--ink)}

/* ===== 09 motion & progress & skip ===== */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .38s ease,transform .38s ease}
[data-reveal].is-in{opacity:1;transform:none}
.scroll-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:90;background:var(--gold);transform:scaleX(0);transform-origin:left center;pointer-events:none}
.skip-link{position:fixed;left:10px;top:10px;z-index:200;transform:translateY(-200%);padding:11px 18px;background:var(--gold);color:var(--ink);border:2px solid var(--ink);font-size:14px;font-weight:900;transition:transform .18s ease}
.skip-link:focus{transform:translateY(0)}

/* ===== 10 header ===== */
.site-header{position:fixed;inset:0 auto 0 0;width:var(--rail-w);z-index:60;background:rgba(16,23,28,.86);color:var(--paper);border-right:2px solid var(--ink);transition:background-color .2s ease,box-shadow .2s ease}
.site-header[data-scrolled="true"]{background:var(--nav-green);box-shadow:6px 0 0 rgba(16,23,28,.14)}
.bar{display:flex;flex-direction:column;height:100%;width:100%}
.brand{display:flex;flex-direction:column;align-items:center;gap:8px;padding:14px 6px;border-bottom:1px solid rgba(245,239,227,.16);color:var(--paper)}
.brand__mark{display:grid;place-items:center;width:40px;height:40px;border:2px solid var(--gold);color:var(--gold);font-size:19px;font-weight:900;line-height:1}
.brand__text{display:flex;flex-direction:column;align-items:center;gap:6px}
.brand__name{writing-mode:vertical-rl;text-orientation:mixed;font-size:12px;font-weight:900;letter-spacing:.18em;line-height:1}
.brand__tag{display:none}
.nav-toggle{display:none}
.site-nav{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin}
.site-nav__note{display:none}
.site-nav__list{display:flex;flex-direction:column;padding:4px 0}
.site-nav__item{border-bottom:1px solid rgba(245,239,227,.1)}
.site-nav__link{display:flex;flex-direction:column;align-items:center;gap:5px;min-height:44px;padding:11px 4px;border-left:3px solid transparent;color:rgba(245,239,227,.74);transition:color .18s ease,background-color .18s ease,border-color .18s ease}
.site-nav__link:hover{color:var(--paper);background:rgba(245,239,227,.09);border-left-color:var(--gold)}
.site-nav__index{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--teal-2)}
.site-nav__label{writing-mode:vertical-rl;text-orientation:mixed;font-size:12px;font-weight:900;letter-spacing:.1em;line-height:1}
.site-nav__link[aria-current="page"]{background:rgba(16,23,28,.55);color:var(--paper);border-left-color:var(--gold)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--gold)}
.site-nav__cta{display:flex;flex-direction:row;gap:6px;padding:10px 8px 14px;border-top:1px solid rgba(245,239,227,.16)}
.site-nav__cta .btn{flex:1 1 0;min-height:44px;padding:14px 0;background:transparent;color:var(--paper);border-color:rgba(245,239,227,.42);box-shadow:none;font-size:11px;letter-spacing:.14em}
.site-nav__cta .btn:hover{transform:none;box-shadow:none;background:rgba(245,239,227,.12)}
.site-nav__cta .btn--gold{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.site-nav__cta .btn--gold:hover{background:#F0C257}
.site-nav__cta .btn--ghost:hover{background:var(--help-blue);border-color:var(--help-blue);color:var(--paper)}
.btn--rail{writing-mode:vertical-rl;text-orientation:mixed;line-height:1}

@media (min-width:1024px){
  body{padding-left:var(--rail-w);background-attachment:fixed}
  .scroll-progress{left:var(--rail-w)}
}

/* ===== 11 footer ===== */
.site-footer{margin-top:72px;padding-block:56px 26px;background-color:var(--ink);background-image:linear-gradient(to right,rgba(245,239,227,.06) 1px,transparent 1px);background-size:48px 48px;color:rgba(245,239,227,.78);border-top:2px solid var(--ink)}
.foot-grid{display:grid;gap:32px;grid-template-columns:1.4fr 1fr 1fr 1fr 1.6fr}
.foot-brand__mark{display:grid;place-items:center;width:44px;height:44px;border:2px solid var(--gold);color:var(--gold);font-size:22px;font-weight:900;line-height:1}
.foot-brand__name{margin-top:12px;font-size:20px;font-weight:900;color:var(--paper);letter-spacing:-.01em}
.foot-brand__line{margin-top:6px;font-size:12px;letter-spacing:.16em;color:var(--teal-2)}
.foot-routes{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.route-chip{display:inline-flex;align-items:center;gap:8px;padding:7px 11px;font-size:13px;font-weight:700;color:var(--paper);background:rgba(245,239,227,.04);border:1px solid rgba(245,239,227,.22);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.route-chip__k{font-family:var(--mono);font-size:11px;color:rgba(245,239,227,.6)}
.route-chip--teal{border-color:var(--teal-2)}
.route-chip--blue{border-color:var(--help-blue)}
.route-chip--crimson{border-color:var(--crimson)}
.route-chip:hover{transform:translate(-2px,-2px);box-shadow:4px 4px 0 rgba(0,0,0,.5)}
.foot-col__title{padding-bottom:10px;margin-bottom:12px;border-bottom:1px solid rgba(245,239,227,.2);font-size:13px;font-weight:900;letter-spacing:.18em;color:var(--gold)}
.foot-col__list{display:flex;flex-direction:column;gap:9px}
.foot-col__link{font-size:14px;color:rgba(245,239,227,.8);border-bottom:1px solid transparent;transition:color .18s ease,border-color .18s ease}
.foot-col__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.foot-contact__title{padding-bottom:10px;margin-bottom:6px;border-bottom:1px solid rgba(245,239,227,.2);font-size:13px;font-weight:900;letter-spacing:.18em;color:var(--help-blue)}
.foot-contact__list{display:flex;flex-direction:column}
.foot-contact__item{display:flex;flex-direction:column;gap:3px;padding:9px 0;border-bottom:1px solid rgba(245,239,227,.12)}
.foot-contact__label{font-size:11px;letter-spacing:.18em;color:var(--help-blue)}
.foot-contact__value{font-family:var(--mono);font-size:14px;color:var(--paper);word-break:break-all}
.foot-contact__note{margin-top:12px;max-width:34em;font-size:12px;line-height:1.7;color:rgba(245,239,227,.58)}
.foot-bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;margin-top:40px;padding-top:18px;border-top:2px solid rgba(245,239,227,.2)}
.foot-legal{font-size:12px;letter-spacing:.04em;color:rgba(245,239,227,.66)}
.foot-coord{font-family:var(--mono);font-size:11px;letter-spacing:.24em;color:var(--teal-2)}

/* ===== 12 tablet ===== */
@media (max-width:1199px){
  .foot-grid{grid-template-columns:1fr 1fr 1fr;gap:28px}
  .foot-brand{grid-column:span 3}
  .foot-contact{grid-column:span 3}
}
@media (max-width:1023px){
  body{padding-top:var(--bar-h)}
  .site-header{inset:0 0 auto 0;width:auto;height:var(--bar-h);border-right:0;border-bottom:2px solid var(--ink);background:var(--nav-green)}
  .site-header[data-scrolled="true"]{background:var(--nav-green);box-shadow:0 6px 0 rgba(16,23,28,.14)}
  .bar{position:relative;flex-direction:row;align-items:center;justify-content:space-between;gap:12px;height:100%;padding:0 14px}
  .brand{flex-direction:row;align-items:center;gap:10px;padding:0;border-bottom:0}
  .brand__mark{width:34px;height:34px;font-size:16px}
  .brand__text{flex-direction:column;align-items:flex-start;gap:2px}
  .brand__name{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.06em}
  .brand__tag{display:block;font-size:11px;letter-spacing:.14em;color:rgba(245,239,227,.6)}
  .nav-toggle{display:flex;align-items:center;gap:10px;min-height:44px;min-width:44px;padding:8px 12px;border:2px solid rgba(245,239,227,.55);color:var(--paper);font-size:13px;font-weight:900;letter-spacing:.14em;transition:background-color .18s ease}
  .nav-toggle:hover{background:rgba(245,239,227,.14)}
  .nav-toggle__bars{display:flex;flex-direction:column;justify-content:space-between;width:20px;height:14px}
  .nav-toggle__bars span{display:block;height:2px;background:var(--paper);transition:transform .2s ease,opacity .2s ease}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
  .site-nav{position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;max-height:calc(100vh - var(--bar-h));overflow-y:auto;background:var(--nav-green);border-bottom:2px solid var(--ink);box-shadow:0 14px 0 rgba(16,23,28,.16);padding-bottom:14px}
  .site-nav[data-open="true"]{display:flex}
  .site-nav__note{display:block;padding:12px 18px 10px;border-bottom:1px solid rgba(245,239,227,.14);font-size:11px;letter-spacing:.14em;color:rgba(245,239,227,.58)}
  .site-nav__list{padding:0}
  .site-nav__item{border-bottom:1px solid rgba(245,239,227,.12)}
  .site-nav__link{flex-direction:row;align-items:center;gap:14px;min-height:50px;padding:15px 18px;border-left:0}
  .site-nav__index{width:22px;font-size:12px}
  .site-nav__label{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.06em}
  .site-nav__link[aria-current="page"]{border-left:4px solid var(--gold);background:rgba(16,23,28,.5)}
  .site-nav__cta{flex-direction:row;gap:10px;padding:14px 18px 4px;border-top:1px solid rgba(245,239,227,.14)}
  .site-nav__cta .btn--rail{writing-mode:horizontal-tb;padding:13px 10px;font-size:14px;letter-spacing:.06em}
  .section{padding-block:48px}
  .grid{gap:18px}
  .span-3,.span-4{grid-column:span 6}
  .span-5,.span-7,.span-8{grid-column:span 12}
  .foot-grid{grid-template-columns:1fr 1fr;gap:26px}
  .foot-brand,.foot-contact{grid-column:span 2}
  .site-footer{margin-top:56px;padding-block:44px 22px}
}

/* ===== 13 phone ===== */
@media (max-width:639px){
  body{font-size:16px}
  .wrap{width:min(var(--wrap),100% - 28px)}
  .section{padding-block:40px}
  .section__head{gap:8px 12px}
  .section__note{margin-left:0;flex-basis:100%}
  .panel{padding:22px 16px 20px}
  .frame{padding:18px}
  .span-3,.span-4,.span-6{grid-column:span 12}
  .foot-grid{grid-template-columns:1fr}
  .foot-brand,.foot-contact{grid-column:span 1}
  .foot-bar{flex-direction:column;align-items:flex-start;gap:8px}
  .grid{gap:16px}
}

/* ===== 14 reduced motion ===== */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  [data-reveal]{opacity:1;transform:none}
  .btn:hover,.route-chip:hover{transform:none}
  .scroll-progress{display:none}
}