/* ===== 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{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
img,svg,video{display:block;max-width:100%}
[hidden]{display:none !important}

/* ===== variables ===== */
:root{
  --ink:#0B1F3A;
  --ink-2:#132B4D;
  --gold:#D4AF37;
  --gold-deep:#7A5A18;
  --paper:#F7F3EA;
  --black:#111418;
  --ochre:#A65E2E;
  --snow:#9FC7C9;
  --snow-ink:#3F7C80;
  --dust:#6E7787;
  --white:#FFFFFF;
  --rail-w:112px;
  --bar-h:60px;
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ===== base ===== */
body{
  font-family:var(--font-cn);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--black);
  background-color:var(--paper);
  background-image:
    repeating-linear-gradient(0deg,rgba(11,31,58,.055) 0 1px,transparent 1px 88px),
    repeating-linear-gradient(90deg,rgba(11,31,58,.055) 0 1px,transparent 1px 88px);
}
h1,h2,h3,h4{font-weight:900;line-height:1.1;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(40px,7.2vw,96px)}
h2{font-size:clamp(28px,4vw,52px)}
h3{font-size:clamp(20px,2.4vw,28px);line-height:1.26}
strong{font-weight:800;color:var(--ink)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
#main-content{scroll-margin-top:76px}

/* ===== layout ===== */
.wrap{width:100%;max-width:1180px;margin-inline:auto;padding-inline:20px}
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid--split{grid-template-columns:1fr}
.flow > * + *{margin-top:var(--flow-gap,18px)}
.rule{height:1px;background:rgba(17,20,24,.16);border:0;margin-block:32px}
.rule--gold{height:2px;width:64px;background:var(--gold);margin-block:20px}

/* ===== typography helpers ===== */
.coord{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--gold-deep);
}
.coord::before{content:"";width:18px;height:2px;background:var(--gold)}
.coord--light{color:var(--gold)}
.section-head{max-width:64ch;margin-bottom:clamp(20px,3vw,36px)}
.section-head__title{margin-top:10px}
.section-head__lead{margin-top:14px;font-size:17px;color:#39414D}
.note{font-size:12.5px;line-height:1.7;letter-spacing:.02em;color:var(--dust)}
.note--vertical{writing-mode:vertical-rl;letter-spacing:.3em;font-size:12px;color:var(--ochre)}

/* ===== breadcrumb ===== */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:16px;font-family:var(--font-mono);
  font-size:12px;letter-spacing:.12em;color:var(--dust);
}
.breadcrumb__link{color:var(--dust);border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--gold-deep);border-bottom-color:var(--gold)}
.breadcrumb__sep{color:rgba(17,20,24,.28)}
.breadcrumb__current{color:var(--ink);font-weight:700}

/* ===== buttons & links ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:2px;cursor:pointer;
  font-size:15px;font-weight:800;letter-spacing:.06em;
  border:1px solid var(--ink);background:var(--ink);color:var(--paper);
  transition:background .18s,color .18s,border-color .18s,transform .18s;
}
.btn:hover{background:var(--ink-2);border-color:var(--ink-2);transform:translateY(-1px)}
.btn--gold{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btn--gold:hover{background:var(--gold-deep);border-color:var(--gold-deep);color:var(--paper)}
.btn--outline{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn--outline:hover{background:var(--ink);color:var(--paper)}
.btn--onDark{background:transparent;border-color:rgba(247,243,234,.5);color:var(--paper)}
.btn--onDark:hover{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btn--sm{padding:8px 14px;font-size:13px}
.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-weight:800;color:var(--ink);
  border-bottom:2px solid var(--gold);padding-bottom:2px;
}
.link-arrow::after{content:"→";color:var(--gold-deep)}
.link-arrow:hover{color:var(--gold-deep)}

/* ===== tags ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 10px;border-radius:2px;
  font-size:12px;font-weight:700;letter-spacing:.08em;
  color:var(--ochre);border:1px solid currentColor;background:rgba(166,94,46,.08);
}
.tag--snow{color:var(--snow-ink);background:rgba(159,199,201,.2)}
.tag--gold{color:var(--gold-deep);background:rgba(212,175,55,.16)}
.tag--dark{color:var(--paper);background:rgba(247,243,234,.12);border-color:rgba(247,243,234,.4)}

/* ===== cards & panels ===== */
.card{
  position:relative;background:var(--white);
  border:1px solid rgba(17,20,24,.16);border-inline-start:3px solid var(--gold);
  padding:22px 22px 20px;
  box-shadow:6px 6px 0 rgba(11,31,58,.08);
  transition:transform .2s,box-shadow .2s,border-color .2s;
}
.card:hover{transform:translateY(-2px);box-shadow:8px 10px 0 rgba(11,31,58,.13);border-color:rgba(17,20,24,.32)}
.card__index{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--gold-deep)}
.card__title{font-size:20px;font-weight:900;line-height:1.3;color:var(--ink);margin-block:6px 8px}
.card__body{font-size:15px;line-height:1.7;color:#2A2F38}
.card__meta{
  display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--dust);
}
.card--tilt{transform:rotate(-1.2deg)}
.card--tilt:hover{transform:rotate(-1.2deg) translateY(-2px)}
.card--night{
  background:var(--ink-2);color:var(--paper);
  border-color:rgba(212,175,55,.35);border-inline-start-color:var(--gold);
  box-shadow:6px 6px 0 rgba(0,0,0,.25);
}
.card--night .card__title{color:var(--paper)}
.card--night .card__body{color:rgba(247,243,234,.82)}
.card--night .card__meta{color:rgba(247,243,234,.62)}
.panel{
  position:relative;background:var(--ink);color:var(--paper);
  border:1px solid rgba(212,175,55,.3);
  padding:clamp(24px,4vw,48px);
}
.panel h2,.panel h3,.panel h4{color:var(--paper)}
.panel p{color:rgba(247,243,234,.84)}
.panel--paper{background:var(--paper);color:var(--black);border-color:rgba(17,20,24,.16)}
.panel--paper h2,.panel--paper h3{color:var(--ink)}
.panel--paper p{color:#39414D}

/* ===== media frames ===== */
.media-frame{
  position:relative;display:block;margin:0;overflow:hidden;
  aspect-ratio:16 / 10;background:var(--ink);
  border:1px solid rgba(17,20,24,.22);
  box-shadow:8px 8px 0 rgba(11,31,58,.1);
}
.media-frame img,.media-frame picture,.media-frame video{width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--placeholder{
  background-image:
    radial-gradient(circle at 50% 50%,rgba(212,175,55,.5) 0 3px,transparent 3px),
    repeating-linear-gradient(0deg,rgba(247,243,234,.12) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(247,243,234,.12) 0 1px,transparent 1px 44px),
    linear-gradient(150deg,var(--ink),var(--ink-2));
}
.media-frame__caption{
  position:absolute;inset:auto 0 0 0;
  padding:10px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  color:var(--paper);
  background:linear-gradient(to top,rgba(11,31,58,.9),rgba(11,31,58,0));
}

/* ===== copy button ===== */
.copy-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:2px;cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:var(--gold);border:1px solid rgba(212,175,55,.5);
  transition:background .18s,color .18s,border-color .18s;
}
.copy-btn:hover{background:var(--gold);color:var(--ink)}
.copy-btn[data-copied="true"]{background:var(--snow);border-color:var(--snow);color:var(--ink)}

/* ===== filter bar ===== */
.filter-bar{
  display:flex;flex-wrap:wrap;gap:8px;
  padding-block:14px;margin-block:20px;
  border-block:1px solid rgba(17,20,24,.14);
}
.filter-btn{
  padding:6px 14px;border-radius:999px;cursor:pointer;
  font-size:13px;font-weight:700;letter-spacing:.06em;
  color:var(--ink);background:rgba(255,255,255,.65);
  border:1px solid rgba(17,20,24,.28);
  transition:background .18s,color .18s,border-color .18s;
}
.filter-btn:hover{border-color:var(--gold-deep);color:var(--gold-deep)}
.filter-btn[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:var(--gold)}

/* ===== accordion ===== */
.accordion{border-top:1px solid rgba(17,20,24,.16)}
.accordion__item{border-bottom:1px solid rgba(17,20,24,.16)}
.accordion__trigger{
  display:flex;width:100%;align-items:flex-start;justify-content:space-between;gap:16px;
  padding:18px 4px;text-align:left;cursor:pointer;
  font-size:17px;font-weight:800;color:var(--ink);
}
.accordion__trigger::after{content:"+";font-family:var(--font-mono);font-size:20px;line-height:1;color:var(--gold-deep)}
.accordion__trigger[aria-expanded="true"]::after{content:"–"}
.accordion__trigger:hover{color:var(--gold-deep)}
.accordion__panel{padding:0 4px 20px;font-size:15.5px;line-height:1.75;color:#39414D}

/* ===== reveal ===== */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .35s ease,transform .35s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ===== skip link ===== */
.skip-link{
  position:fixed;top:-120px;left:12px;z-index:200;
  padding:10px 18px;border-radius:2px;
  background:var(--gold);color:var(--ink);
  font-size:14px;font-weight:800;letter-spacing:.06em;
  transition:top .18s ease;
}
.skip-link:focus{top:12px}

/* ===== header / rail ===== */
.site-header{position:sticky;top:0;z-index:60}
.rail{
  position:relative;display:flex;align-items:center;justify-content:space-between;
  gap:12px;min-height:var(--bar-h);padding:8px 16px;
  background:var(--ink);color:var(--paper);
  border-bottom:1px solid rgba(212,175,55,.45);
}
.rail__brand{display:flex;align-items:center;gap:10px;min-width:0}
.rail__mark{color:var(--gold);font-size:18px;line-height:1}
.rail__brand-text{display:flex;flex-direction:column;line-height:1.15}
.rail__brand-line{font-size:20px;font-weight:900;letter-spacing:.02em;color:var(--paper)}
.rail__coord{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--gold);
}
.rail__toggle{
  position:relative;z-index:3;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 10px;border-radius:2px;cursor:pointer;
  border:1px solid rgba(212,175,55,.5);color:var(--paper);
}
.rail__toggle:hover{border-color:var(--gold);color:var(--gold)}
.rail__toggle-text{font-size:12px;letter-spacing:.18em}
.rail__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.rail__bar{display:block;height:2px;background:var(--gold);transition:transform .2s ease,opacity .2s ease}
.site-header[data-open] .rail__bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .rail__bar:nth-child(2){opacity:0}
.site-header[data-open] .rail__bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.rail__nav{
  position:fixed;top:0;left:0;bottom:0;z-index:2;
  display:flex;flex-direction:column;gap:8px;
  width:min(86vw,340px);
  padding:calc(var(--bar-h) + 20px) 18px 24px;
  background:var(--ink-2);
  border-right:1px solid rgba(212,175,55,.35);
  overflow-y:auto;
  transform:translateX(-102%);
  transition:transform .24s ease;
}
.site-header[data-open] .rail__nav{transform:none}
.rail__list{display:flex;flex-direction:column;gap:2px}
.rail__link{
  display:flex;flex-direction:row;align-items:center;gap:10px;
  padding:12px 12px;border-inline-start:2px solid transparent;
  color:rgba(247,243,234,.9);
  transition:color .18s,background .18s,border-color .18s;
}
.rail__link:hover{color:var(--gold);background:rgba(212,175,55,.1)}
.rail__link[aria-current="page"]{
  color:var(--gold);border-inline-start-color:var(--gold);
  background:rgba(212,175,55,.12);
}
.rail__index{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--gold)}
.rail__label{font-size:15px;font-weight:700;letter-spacing:.04em}
.rail__foot{
  display:flex;flex-direction:column;gap:10px;margin-top:auto;
  padding-top:18px;border-top:1px solid rgba(247,243,234,.16);
}
.rail__cta{
  display:inline-flex;justify-content:center;
  padding:12px 16px;border:1px solid var(--gold);
  background:var(--gold);color:var(--ink);
  font-size:14px;font-weight:800;letter-spacing:.08em;
  transition:background .18s,color .18s,border-color .18s;
}
.rail__cta:hover{background:var(--gold-deep);border-color:var(--gold-deep);color:var(--paper)}
.rail__note{font-size:11px;line-height:1.6;letter-spacing:.04em;color:rgba(247,243,234,.6)}
.rail__scrim{
  position:fixed;inset:0;z-index:1;
  background:rgba(11,31,58,.66);
  opacity:0;pointer-events:none;transition:opacity .2s ease;
}
.site-header[data-open] .rail__scrim{opacity:1;pointer-events:auto}
.rail__progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:rgba(247,243,234,.14)}
.rail__progress-fill{display:block;width:0;height:100%;background:var(--gold);transition:width .1s linear,height .1s linear}

/* ===== footer ===== */
.site-footer{
  position:relative;background:var(--ink);color:var(--paper);
  border-top:3px solid var(--gold);
}
.foot{padding-block:clamp(40px,6vw,72px) 24px}
.foot__top{display:grid;grid-template-columns:1fr;gap:clamp(28px,4vw,48px)}
.foot__brand{min-width:0}
.foot__title{
  margin-top:8px;font-size:clamp(30px,4vw,44px);
  font-weight:900;letter-spacing:-.01em;color:var(--paper);
}
.foot__summary{margin-top:12px;max-width:34ch;font-size:15.5px;line-height:1.8;color:rgba(247,243,234,.78)}
.foot__coord{margin-top:16px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;color:var(--gold)}
.foot__nav{display:grid;grid-template-columns:1fr;gap:clamp(24px,3vw,40px)}
.foot__col{min-width:0}
.foot__col-title{
  margin-bottom:14px;font-family:var(--font-mono);
  font-size:12px;font-weight:700;letter-spacing:.2em;
  text-transform:uppercase;color:var(--gold);
}
.foot__links{display:grid;gap:10px}
.foot__link{
  display:inline-flex;align-items:center;gap:10px;
  padding-bottom:2px;font-size:15px;
  color:rgba(247,243,234,.86);border-bottom:1px solid transparent;
  transition:color .18s,border-color .18s;
}
.foot__link::before{content:"";width:5px;height:5px;background:var(--gold);opacity:.55;transform:rotate(45deg)}
.foot__link:hover{color:var(--gold);border-bottom-color:var(--gold)}
.foot__contact{display:grid;gap:14px}
.foot__contact-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
.foot__label{
  min-width:64px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.16em;color:rgba(247,243,234,.55);
}
.foot__value{font-size:14.5px;color:var(--paper);word-break:break-word}
.foot__note{margin-top:18px;max-width:36ch;font-size:12.5px;line-height:1.7;color:rgba(247,243,234,.6)}
.foot__bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;margin-top:clamp(32px,5vw,56px);padding-top:20px;
  border-top:1px solid rgba(247,243,234,.18);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;
  color:rgba(247,243,234,.62);
}
.foot__copy{color:rgba(247,243,234,.62)}
.foot__legal{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.foot__legal-link{
  color:rgba(247,243,234,.82);
  border-bottom:1px solid rgba(212,175,55,.4);padding-bottom:1px;
}
.foot__legal-link:hover{color:var(--gold)}
.foot__icp{color:rgba(247,243,234,.55)}

/* ===== tablet: horizontal coordinate bar ===== */
@media (min-width:768px){
  .wrap{padding-inline:32px}
  .rail{padding:10px 24px;gap:20px}
  .rail__toggle{display:none}
  .rail__nav{
    position:static;transform:none;flex:1 1 auto;width:auto;
    flex-direction:row;align-items:center;gap:12px;
    padding:0;background:none;border:0;overflow:visible;
  }
  .rail__list{
    flex-direction:row;flex-wrap:nowrap;gap:2px;
    overflow-x:auto;scrollbar-width:none;
  }
  .rail__list::-webkit-scrollbar{display:none}
  .rail__link{
    padding:8px 10px;border-inline-start:0;
    border-bottom:2px solid transparent;white-space:nowrap;
  }
  .rail__link[aria-current="page"]{
    background:none;border-inline-start-color:transparent;
    border-bottom-color:var(--gold);
  }
  .rail__index{font-size:10px}
  .rail__label{font-size:13px}
  .rail__foot{
    flex:0 0 auto;flex-direction:row;align-items:center;gap:10px;
    margin:0;padding:0;border-top:0;
  }
  .rail__note{display:none}
  .rail__cta{padding:8px 14px;font-size:13px;letter-spacing:.06em;white-space:nowrap}
  .rail__scrim{display:none}
  .foot__nav{grid-template-columns:1fr 1fr}
}
@media (min-width:768px) and (max-width:999px){
  .rail__foot{display:none}
}

/* ===== desktop: fixed vertical rail ===== */
@media (min-width:1200px){
  .wrap{max-width:1120px;padding-inline:40px}
  .site-header{position:fixed;inset:0 auto 0 0;width:var(--rail-w);z-index:60}
  .rail{
    flex-direction:column;align-items:stretch;justify-content:flex-start;
    height:100%;min-height:0;padding:20px 0 0;gap:0;
    border-bottom:0;border-right:1px solid rgba(212,175,55,.35);
    background:var(--ink);
  }
  .rail__brand{
    flex-direction:column;align-items:center;gap:10px;
    margin:0 12px;padding:0 4px 16px;text-align:center;
    border-bottom:1px solid rgba(212,175,55,.25);
  }
  .rail__mark{font-size:22px}
  .rail__brand-line{font-size:18px}
  .rail__coord{writing-mode:vertical-rl;height:88px;overflow:hidden;font-size:9px;letter-spacing:.22em}
  .rail__nav{
    position:static;transform:none;flex:1 1 auto;min-height:0;
    flex-direction:column;align-items:stretch;
    width:100%;padding:14px 8px;background:none;border:0;overflow-y:auto;
  }
  .rail__list{flex-direction:column;width:100%;gap:4px;overflow:visible}
  .rail__link{
    flex-direction:column;gap:5px;align-items:center;
    padding:14px 2px;border-bottom:0;border-inline-start:2px solid transparent;
    white-space:normal;text-align:center;
  }
  .rail__link[aria-current="page"]{
    border-bottom-color:transparent;
    border-inline-start-color:var(--gold);
  }
  .rail__label{font-size:13px;letter-spacing:.06em;line-height:1.35}
  .rail__foot{
    display:flex;flex-direction:column;align-items:stretch;gap:10px;
    margin-top:auto;padding:14px 10px 0;
    border-top:1px solid rgba(212,175,55,.25);
  }
  .rail__note{display:block}
  .rail__cta{padding:10px 6px;font-size:12px;letter-spacing:.04em;text-align:center}
  .rail__scrim{display:none}
  .rail__progress{top:0;bottom:0;left:auto;right:0;width:2px;height:auto}
  .rail__progress-fill{width:100%;height:0}
  #main-content{margin-inline-start:var(--rail-w)}
  .site-footer{margin-inline-start:var(--rail-w)}
  .foot__top{grid-template-columns:minmax(0,4fr) minmax(0,7fr)}
}

/* ===== 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}
}