/* ===== 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}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
main{display:block}

/* ===== tokens ===== */
:root{
  --paper:#F4EBDD;
  --ink:#221A15;
  --ochre:#A44A2A;
  --goji:#C8322B;
  --sand:#D9A441;
  --river:#5E7A78;
  --petro:#E3C3A5;
  --night:#15110E;
  --shell:#FBF6EC;
  --ochre-deep:#7A2F1B;
  --rail-w:88px;
  --index-w:224px;
  --header-h:64px;
  --gutter:clamp(18px,4vw,64px);
  --line:2px;
  --shadow-hard:8px 8px 0 var(--ink);
  --shadow-soft:4px 4px 0 var(--ink);
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-display:"Source Han Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --dur:240ms;
}

/* ===== base / typography ===== */
body{
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 12% 6%,rgba(217,164,65,.16),transparent 42%),
    radial-gradient(circle at 88% 94%,rgba(94,122,120,.14),transparent 46%),
    repeating-linear-gradient(135deg,rgba(34,26,21,.028) 0 2px,transparent 2px 7px);
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;font-weight:200;letter-spacing:-.02em}
strong,b{font-weight:700}
:focus-visible{outline:2px solid var(--sand);outline-offset:3px}

/* ===== skip link ===== */
.skip-link{
  position:absolute;left:12px;top:-96px;z-index:200;
  padding:10px 18px;
  background:var(--ink);color:var(--shell);
  font-family:var(--font-display);font-size:13px;font-weight:700;letter-spacing:.12em;
  text-decoration:none;border:2px solid var(--sand);
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

/* ===== header : brand rail + index rail ===== */
.site-header{
  position:fixed;inset:0 auto 0 0;
  width:calc(var(--rail-w) + var(--index-w));
  z-index:80;
  background:var(--paper);
  border-right:var(--line) solid var(--ink);
}
.rail{display:grid;grid-template-columns:var(--rail-w) minmax(0,1fr);height:100%}

.rail__brand{
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  gap:16px;padding:22px 6px 18px;text-align:center;
  color:var(--shell);
  background:linear-gradient(180deg,var(--ochre) 0 70%,var(--ochre-deep) 70% 100%);
  border-right:var(--line) solid var(--ink);
}
.rail__brand-link{
  display:flex;flex-direction:column;align-items:center;gap:14px;
  text-decoration:none;color:inherit;
}
.rail__brand-mark{
  display:grid;place-items:center;width:42px;height:42px;
  border:2px solid var(--shell);background:rgba(21,17,14,.24);
  font-family:var(--font-display);font-size:17px;font-weight:800;line-height:1;
}
.rail__brand-name{
  writing-mode:vertical-rl;
  font-family:var(--font-display);font-size:22px;font-weight:800;
  letter-spacing:.24em;line-height:1;color:var(--shell);
}
.rail__brand-link:hover .rail__brand-mark{background:var(--goji)}
.rail__descriptor{
  writing-mode:vertical-rl;
  font-size:12px;letter-spacing:.2em;line-height:1.4;
  color:rgba(251,246,236,.88);
}
.rail__status{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;line-height:1.5;
  color:rgba(251,246,236,.92);
}
.rail__status-dot{
  display:inline-block;width:8px;height:8px;margin:0 0 6px;
  background:var(--sand);border:1px solid var(--ink);
}

.rail__command{
  display:flex;flex-direction:column;min-height:0;
  padding:22px 14px 18px;overflow-y:auto;
  background:var(--paper);
}
.rail__command-head{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  margin-bottom:14px;
}
.rail__command-title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ochre-deep);
}
.rail__toggle{display:none}
.rail__toggle-text{font-family:var(--font-display);font-weight:700;font-size:13px;letter-spacing:.06em}
.rail__toggle-bars{display:block;width:16px;height:2px;background:var(--ink)}

.rail__nav{
  display:flex;flex-direction:column;flex:1 1 auto;min-height:0;
  visibility:visible;opacity:1;
}
.rail__nav-list{border-top:2px solid var(--ink)}
.rail__nav-item{border-bottom:1px solid rgba(34,26,21,.18)}
.rail__nav-link{
  display:grid;grid-template-columns:34px minmax(0,1fr);align-items:center;gap:4px;
  padding:11px 8px 11px 10px;
  border-left:6px solid transparent;
  text-decoration:none;color:var(--ink);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.rail__nav-index{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--ochre);
}
.rail__nav-label{
  font-family:var(--font-display);font-weight:700;font-size:15px;letter-spacing:.02em;
}
.rail__nav-link:hover{background:var(--petro);border-left-color:var(--sand)}
.rail__nav-link:hover .rail__nav-index{color:var(--goji)}
.rail__nav-link[aria-current="page"]{
  background:var(--ochre);color:var(--shell);border-left-color:var(--sand);
}
.rail__nav-link[aria-current="page"] .rail__nav-index{color:var(--shell)}
.rail__nav-link:focus-visible{outline:2px solid var(--sand);outline-offset:-4px}

.rail__foot{
  margin-top:auto;padding-top:16px;border-top:2px solid var(--ink);
  display:grid;gap:12px;
}
.rail__cta{
  display:block;padding:10px 12px;text-align:center;text-decoration:none;
  background:var(--goji);color:var(--shell);
  font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.04em;
  border:2px solid var(--ink);box-shadow:var(--shadow-soft);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.rail__cta:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 var(--ink);background:var(--ochre-deep)}
.rail__cta:active{transform:translate(2px,2px);box-shadow:1px 1px 0 var(--ink)}
.rail__meta{
  font-family:var(--font-mono);font-size:11px;line-height:1.65;letter-spacing:.04em;
  color:rgba(34,26,21,.68);
}

/* ===== footer ===== */
.site-footer{
  background-color:var(--night);color:var(--shell);
  border-top:6px solid var(--ochre);
  padding:clamp(36px,6vw,76px) 0 22px;
  background-image:repeating-linear-gradient(90deg,rgba(251,246,236,.045) 0 1px,transparent 1px 14px);
}
.footer-canvas{
  max-width:1180px;margin:0 auto;padding:0 var(--gutter);
  display:grid;gap:clamp(28px,4vw,52px);
}
.footer-lead{display:grid;gap:14px;align-content:start}
.footer-eyebrow{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--sand);
}
.footer-brand{
  justify-self:start;
  font-family:var(--font-display);font-weight:200;
  font-size:clamp(30px,4.4vw,46px);line-height:1.1;letter-spacing:-.02em;
  color:var(--shell);text-decoration:none;
}
.footer-brand:hover{color:var(--sand)}
.footer-summary{
  max-width:34ch;font-size:15px;line-height:1.85;color:rgba(251,246,236,.8);
}
.footer-cta{
  justify-self:start;display:inline-flex;align-items:center;gap:10px;
  padding:11px 20px;text-decoration:none;
  background:var(--goji);color:var(--shell);
  font-family:var(--font-display);font-size:14px;font-weight:700;letter-spacing:.04em;
  border:2px solid var(--shell);box-shadow:6px 6px 0 var(--ochre);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
}
.footer-cta:hover{transform:translate(-2px,-2px);box-shadow:9px 9px 0 var(--ochre);background:var(--ochre)}
.footer-nav{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(126px,1fr));
  gap:24px 20px;
}
.footer-col{
  display:grid;gap:12px;align-content:start;
  border-top:2px solid rgba(251,246,236,.35);padding-top:12px;
}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.2em;
  text-transform:uppercase;color:var(--sand);
}
.footer-list{display:grid;gap:8px}
.footer-link{
  width:fit-content;font-size:14px;text-decoration:none;
  color:rgba(251,246,236,.88);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--sand);border-bottom-color:var(--sand)}
.footer-legal{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:20px 28px;
  border-top:2px solid rgba(251,246,236,.3);padding-top:22px;
}
.footer-legal-item{display:grid;gap:4px;align-content:start}
.footer-legal-label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--petro);
}
.footer-legal-value{font-size:14px;line-height:1.7;color:rgba(251,246,236,.92)}
.footer-note{
  grid-column:1/-1;
  padding-left:12px;border-left:3px solid var(--ochre);
  font-size:12.5px;line-height:1.85;color:rgba(251,246,236,.66);
}
.footer-base{
  grid-column:1/-1;
  display:flex;flex-wrap:wrap;gap:10px 22px;align-items:center;justify-content:space-between;
  border-top:1px solid rgba(251,246,236,.22);padding-top:16px;
}
.footer-copy{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:rgba(251,246,236,.72);
}
.footer-base-mark{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--sand);
}

/* ===== shared layout ===== */
.canvas{
  max-width:1180px;margin-inline:auto;
  padding:clamp(30px,5vw,72px) var(--gutter);
}
.prose{max-width:68ch}
.prose p + p{margin-top:1em}
.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--halves{grid-template-columns:repeat(auto-fit,minmax(258px,1fr))}
.grid--index{grid-template-columns:repeat(auto-fit,minmax(176px,1fr))}
.section-label{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--ochre-deep);
}
.section-label::before{content:"";width:26px;height:2px;background:var(--goji)}
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--river);
}
.rule{border:0;border-top:2px solid var(--ink);margin:clamp(24px,3vw,40px) 0}

/* ===== buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 22px;text-decoration:none;
  font-family:var(--font-display);font-size:15px;font-weight:700;line-height:1;
  color:var(--ink);background:var(--shell);
  border:2px solid var(--ink);box-shadow:var(--shadow-soft);
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             background var(--dur) var(--ease),color var(--dur) var(--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--solid{background:var(--goji);color:var(--shell)}
.btn--outline{background:transparent}
.btn--sand{background:var(--sand);color:var(--ink)}
.btn--river{background:var(--river);color:var(--shell)}

/* ===== breadcrumb ===== */
.breadcrumb{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:rgba(34,26,21,.72)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__link{text-decoration:none;border-bottom:1px solid rgba(164,74,42,.5)}
.breadcrumb__link:hover{color:var(--ochre-deep);border-bottom-color:var(--sand)}
.breadcrumb__sep{color:var(--ochre)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* ===== figure / media frame ===== */
.figure{display:grid;gap:10px;margin:0}
.figure__media{
  position:relative;display:block;width:100%;aspect-ratio:16/9;
  overflow:hidden;background-color:var(--petro);
  background-image:
    repeating-linear-gradient(45deg,rgba(34,26,21,.07) 0 2px,transparent 2px 10px),
    linear-gradient(160deg,rgba(217,164,65,.55),rgba(94,122,120,.32));
  border:2px solid var(--ink);box-shadow:var(--shadow-soft);
}
.figure__media > img,
.figure__media > svg{width:100%;height:100%;object-fit:cover}
.figure__caption{
  font-family:var(--font-mono);font-size:11.5px;line-height:1.7;letter-spacing:.06em;
  color:rgba(34,26,21,.72);
}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure--tall .figure__media{aspect-ratio:3/4}
.figure--square .figure__media{aspect-ratio:1/1}

/* ===== tags ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--ink);background:var(--shell);border:1.5px solid var(--ink);
}
.tag--goji{background:var(--goji);color:var(--shell)}
.tag--river{background:var(--river);color:var(--shell)}
.tag--sand{background:var(--sand);color:var(--ink)}

/* ===== reading progress + reveal ===== */
.read-progress{
  position:fixed;inset:0 0 auto 0;height:4px;z-index:120;
  background:rgba(34,26,21,.18);pointer-events:none;
}
.read-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--goji),var(--ochre) 55%,var(--sand));
  transition:width 120ms linear;
}
.has-reveal [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity var(--dur) var(--ease),transform 320ms var(--ease);
}
.has-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ===== desktop canvas offset ===== */
@media (min-width:1081px){
  body{padding-left:calc(var(--rail-w) + var(--index-w))}
}

/* ===== footer split ===== */
@media (min-width:900px){
  .footer-canvas{grid-template-columns:minmax(0,1fr) minmax(0,1.55fr)}
  .footer-legal,.footer-nav{grid-column:auto}
  .footer-legal{grid-column:1/-1}
}

/* ===== mobile command bar ===== */
@media (max-width:1080px){
  body{padding-left:0}
  .site-header{
    position:sticky;top:0;width:auto;
    border-right:0;border-bottom:var(--line) solid var(--ink);
  }
  .rail{display:block;height:auto}
  .rail__brand{
    flex-direction:row;align-items:center;justify-content:flex-start;
    gap:12px;height:var(--header-h);padding:10px 78px 10px 16px;
    background:linear-gradient(90deg,var(--ochre) 0 62%,var(--ochre-deep) 62% 100%);
    border-right:0;
  }
  .rail__brand-link{flex-direction:row;align-items:center;gap:10px}
  .rail__brand-mark{width:36px;height:36px;font-size:15px}
  .rail__brand-name{writing-mode:horizontal-tb;font-size:19px;letter-spacing:.1em}
  .rail__descriptor,.rail__status{display:none}
  .rail__command{position:static;display:block;padding:0;overflow:visible}
  .rail__command-head{
    position:absolute;top:0;right:0;height:var(--header-h);
    display:flex;align-items:center;gap:8px;padding-right:12px;margin:0;
  }
  .rail__command-title{display:none}
  .rail__toggle{
    display:inline-flex;align-items:center;gap:8px;
    min-height:40px;padding:9px 13px;cursor:pointer;
    background:var(--shell);color:var(--ink);
    border:2px solid var(--ink);box-shadow:3px 3px 0 var(--ink);
  }
  .rail__toggle-bars{position:relative;width:16px;height:2px;background:var(--ink)}
  .rail__toggle-bars::before,
  .rail__toggle-bars::after{
    content:"";position:absolute;left:0;width:16px;height:2px;background:var(--ink);
    transition:transform var(--dur) var(--ease),top var(--dur) var(--ease),background var(--dur) var(--ease);
  }
  .rail__toggle-bars::before{top:-5px}
  .rail__toggle-bars::after{top:5px}
  .site-header[data-open] .rail__toggle{background:var(--goji);color:var(--shell)}
  .site-header[data-open] .rail__toggle-bars{background:transparent}
  .site-header[data-open] .rail__toggle-bars::before{top:0;transform:rotate(45deg);background:var(--shell)}
  .site-header[data-open] .rail__toggle-bars::after{top:0;transform:rotate(-45deg);background:var(--shell)}

  .rail__nav{
    position:absolute;left:0;right:0;top:100%;
    flex:none;max-height:0;overflow:hidden;
    visibility:hidden;opacity:0;
    background:var(--shell);
    border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);
    box-shadow:0 10px 0 rgba(34,26,21,.16);
    transition:max-height 280ms var(--ease),opacity 200ms var(--ease),visibility 0s linear 280ms;
  }
  .site-header[data-open] .rail__nav{
    max-height:calc(100vh - var(--header-h));overflow-y:auto;
    visibility:visible;opacity:1;padding:10px 16px 20px;
    transition:max-height 320ms var(--ease),opacity 200ms var(--ease),visibility 0s;
  }
  .rail__nav-list{border-top:0}
  .rail__nav-link{grid-template-columns:38px minmax(0,1fr);padding:13px 10px}
  .rail__nav-label{font-size:16px}
  .rail__foot{margin-top:16px}
  .rail__cta{display:flex;align-items:center;justify-content:center;min-height:44px;width:100%}

  .canvas{padding-top:clamp(24px,5vw,44px)}
  .read-progress{height:3px}
}

@media (max-width:560px){
  body{font-size:16px}
  .rail__brand-name{font-size:17px;letter-spacing:.06em}
  .rail__toggle{padding:8px 11px}
  .footer-base{flex-direction:column;align-items:flex-start}
}

/* ===== 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;
  }
  .has-reveal [data-reveal]{opacity:1;transform:none}
  .read-progress__bar{transition:none}
  .rail__cta:hover,.btn:hover,.footer-cta:hover{transform:none}
}