/* ============ Reset & Tokens ============ */
:root{
  --ink:#1a1a1a;
  --parchment:#f2ead9;
  --cinnabar:#c3272b;
  --gold:#c9a54a;
  --celadon:#7ba3a1;
  --brown:#3e2b1e;
  --pale-gold:#e8d5a8;
  --mist:#e5dfd3;
  --white:#ffffff;
  --ink-soft:#2c2c2c;
  --ink-muted:rgba(26,26,26,.72);
  --line-pale:rgba(201,165,74,.35);
  --line-ink:rgba(26,26,26,.14);
  --header-h:72px;
  --nav-w:264px;
  --page-w:1280px;
  --font-serif:"Source Han Serif SC","Noto Serif CJK SC","Songti SC","SimSun",serif;
  --font-sans:"Source Han Sans SC","Noto Sans CJK SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","SF Mono","Consolas",monospace;
  --shadow-card:0 2px 12px rgba(30,20,8,.08),0 1px 3px rgba(30,20,8,.06);
  --shadow-lift:0 12px 30px rgba(30,20,8,.14),0 2px 8px rgba(30,20,8,.08);
  --radius:10px;
  --radius-sm:6px;
  --transition-base:.28s cubic-bezier(.4,0,.2,1);
}
*,
*::before,
*::after{
  box-sizing:border-box;
  margin:0;
  padding:0;
}
html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--ink);
  background:var(--parchment);
  min-height:100vh;
  display:flex;
  flex-direction:column;
}
img{
  max-width:100%;
  display:block;
}
ul,ol{
  list-style:none;
}
a{
  color:var(--celadon);
  text-decoration:none;
  transition:color var(--transition-base);
}
a:hover{
  color:var(--gold);
}
button{
  font:inherit;
  border:none;
  background:none;
  cursor:pointer;
  color:inherit;
}
:focus-visible{
  outline:3px solid var(--gold);
  outline-offset:3px;
  border-radius:2px;
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    transition-duration:.01ms !important;
  }
}

/* ============ Skip Link ============ */
.site-skip{
  position:fixed;
  top:-100%;
  left:16px;
  z-index:2000;
  padding:10px 20px;
  background:var(--ink);
  color:var(--white);
  border-radius:0 0 8px 8px;
  font-size:14px;
  font-weight:600;
  transition:top .2s ease;
}
.site-skip:focus{
  top:0;
  color:var(--white);
}
.site-skip:focus-visible{
  outline-color:var(--gold);
}

/* ============ Header Layout ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:1000;
  width:100%;
  background:var(--brown);
  border-bottom:2px solid var(--gold);
  box-shadow:0 2px 16px rgba(26,26,26,.2);
}
.header-inner{
  max-width:var(--page-w);
  margin:0 auto;
  height:var(--header-h);
  padding:0 24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  position:relative;
}
/* brand */
.brand-block{
  display:inline-flex;
  align-items:center;
  gap:14px;
  color:var(--parchment);
  text-decoration:none;
}
.brand-block:hover{
  color:var(--white);
}
.brand-mark{
  position:relative;
  width:40px;
  height:40px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  padding:9px 8px;
  border:1.5px solid var(--gold);
  border-radius:8px;
  background:linear-gradient(135deg, rgba(201,165,74,.12) 0%, rgba(201,165,74,0) 60%);
}
.brand-mark-line{
  height:2px;
  background:var(--gold);
  border-radius:2px;
  opacity:.8;
}
.brand-mark-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--cinnabar);
  position:absolute;
}
.brand-mark-dot:nth-child(1){
  top:5px;
  left:5px;
}
.brand-mark-dot:nth-child(3){
  bottom:5px;
  right:5px;
}
.brand-text{
  display:flex;
  flex-direction:column;
  line-height:1.15;
}
.brand-title{
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--white);
}
.brand-sub{
  font-size:12px;
  letter-spacing:.22em;
  color:var(--pale-gold);
  margin-top:2px;
  font-weight:400;
}
/* header right */
.header-right{
  display:flex;
  align-items:center;
  gap:16px;
}
.section-indicator{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--pale-gold);
  border:1px solid rgba(201,165,74,.35);
  border-radius:100px;
  padding:5px 16px;
  background:rgba(26,26,26,.2);
  white-space:nowrap;
}
/* progress */
.top-progress{
  position:absolute;
  top:0;
  left:0;
  height:3px;
  width:0%;
  background:linear-gradient(90deg, var(--cinnabar), var(--gold));
  z-index:5;
  border-radius:0 4px 4px 0;
  transform-origin:left center;
  transition:width .08s linear;
}
@media (prefers-reduced-motion: reduce){
  .top-progress{transition:none;}
}

/* ============ Navigation ============ */
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid rgba(201,165,74,.4);
  border-radius:8px;
  background:rgba(26,26,26,.18);
  color:var(--parchment);
  font-size:13px;
  font-weight:600;
  line-height:1;
}
.nav-toggle:hover{
  border-color:var(--gold);
  color:var(--white);
}
.nav-toggle-box{
  display:flex;
  flex-direction:column;
  gap:4px;
  width:16px;
}
.nav-toggle-line{
  height:2px;
  width:100%;
  background:currentColor;
  border-radius:2px;
  transition:var(--transition-base);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1){
  transform:translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2){
  opacity:0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3){
  transform:translateY(-6px) rotate(-45deg);
}
.site-nav{
  position:fixed;
  top:var(--header-h);
  left:0;
  bottom:0;
  width:var(--nav-w);
  background:var(--brown);
  border-right:1px solid rgba(201,165,74,.25);
  padding:32px 24px 20px;
  overflow-y:auto;
  z-index:900;
  color:var(--parchment);
  transition:transform .3s ease;
  display:flex;
  flex-direction:column;
}
.nav-inner{
  display:flex;
  flex-direction:column;
  height:100%;
}
.nav-eyebrow{
  font-family:var(--font-serif);
  font-size:14px;
  font-weight:700;
  letter-spacing:.3em;
  color:var(--gold);
  padding-bottom:16px;
  border-bottom:1px solid rgba(201,165,74,.28);
  margin-bottom:20px;
  text-transform:uppercase;
}
.nav-list{
  display:flex;
  flex-direction:column;
  gap:4px;
}
.nav-link{
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 18px;
  font-family:var(--font-serif);
  font-size:16px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--parchment);
  border-radius:8px;
  border-left:3px solid transparent;
  text-decoration:none;
  transition:background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
}
.nav-link::before{
  content:"";
  width:6px;
  height:6px;
  border-radius:50%;
  border:1px solid var(--gold);
  background:transparent;
  flex-shrink:0;
  transition:background var(--transition-base);
}
.nav-link:hover{
  background:rgba(201,165,74,.1);
  color:var(--white);
  border-left-color:var(--gold);
}
.nav-link[aria-current="page"]{
  background:linear-gradient(90deg, rgba(201,165,74,.18) 0%, rgba(201,165,74,.02) 100%);
  color:var(--pale-gold);
  border-left-color:var(--gold);
}
.nav-link[aria-current="page"]::before{
  background:var(--gold);
  box-shadow:0 0 0 3px rgba(201,165,74,.15);
}
.nav-footer-mini{
  margin-top:auto;
  padding-top:24px;
  border-top:1px solid rgba(201,165,74,.18);
}
.nav-footer-rule{
  display:block;
  height:3px;
  width:100%;
  background:repeating-linear-gradient(90deg, var(--gold) 0 6px, transparent 6px 12px);
  opacity:.3;
  border-radius:3px;
  margin-bottom:12px;
}
.nav-footer-text{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:rgba(242,234,217,.6);
}

/* ============ Main & Footer Layout ============ */
#main-content{
  flex:1;
  min-width:0;
  display:flex;
  flex-direction:column;
  margin-left:var(--nav-w);
  width:calc(100% - var(--nav-w));
}
.page-shell{
  flex:1;
  width:100%;
  max-width:var(--page-w);
  margin:0 auto;
  padding:48px 40px 80px;
}
/* make sure fixed side nav leaves space on desktop */
@media (min-width: 981px){
  body{
    padding-left:var(--nav-w);
  }
  #main-content{
    margin-left:0;
    width:100%;
  }
  /* nav at left */
  .site-nav{
    transform:none;
  }
}
/* mobile drawer */
@media (max-width: 980px){
  body{
    padding-left:0;
  }
  #main-content{
    margin-left:0;
    width:100%;
  }
  .nav-toggle{
    display:inline-flex;
  }
  .site-nav{
    transform:translateX(-100%);
    width:min(320px, 86vw);
    box-shadow:none;
  }
  .site-nav[data-open="true"]{
    transform:translateX(0);
    box-shadow:6px 0 30px rgba(0,0,0,.3);
  }
}

/* ============ Footer ============ */
.site-footer{
  background:var(--brown);
  color:var(--parchment);
  border-top:2px solid var(--gold);
  position:relative;
  margin-left:var(--nav-w);
  width:calc(100% - var(--nav-w));
}
.footer-board-bar{
  height:12px;
  display:flex;
  overflow:hidden;
  background:var(--ink-soft);
}
.board-bg{
  display:block;
  height:100%;
  flex:1;
  background:repeating-linear-gradient(90deg, transparent 0 22px, rgba(201,165,74,.16) 22px 24px, rgba(242,234,217,.05) 24px 26px);
}
.board-bg-right{
  flex:2;
  background:repeating-linear-gradient(135deg, transparent 0 20px, rgba(123,163,161,.18) 20px 22px, transparent 22px 46px);
}
.footer-inner{
  max-width:var(--page-w);
  margin:0 auto;
  padding:48px 40px 28px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1.4fr;
  gap:40px;
  margin-bottom:36px;
}
.footer-brand-name{
  font-family:var(--font-serif);
  font-size:22px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--white);
  margin-bottom:14px;
}
.footer-brand-dot{
  color:var(--cinnabar);
  margin:0 4px;
}
.footer-trust{
  font-size:14px;
  line-height:1.8;
  color:rgba(242,234,217,.66);
  max-width:420px;
}
.footer-col-title{
  font-family:var(--font-serif);
  font-weight:700;
  font-size:15px;
  letter-spacing:.14em;
  color:var(--gold);
  padding-bottom:12px;
  border-bottom:1px solid rgba(201,165,74,.2);
  margin-bottom:16px;
  text-transform:uppercase;
}
.footer-links,.footer-contact{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-links a{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--parchment);
  font-size:14px;
  letter-spacing:.04em;
}
.footer-links a::before{
  content:"";
  width:5px;
  height:5px;
  border:1px solid var(--gold);
  transform:rotate(45deg);
  transition:background var(--transition-base);
  flex-shrink:0;
}
.footer-links a:hover{
  color:var(--gold);
}
.footer-links a:hover::before{
  background:var(--gold);
}
.footer-contact li{
  display:flex;
  flex-direction:column;
  gap:2px;
  font-size:14px;
  line-height:1.6;
}
.contact-label{
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:rgba(201,165,74,.7);
  font-family:var(--font-mono);
}
.contact-value{
  color:var(--parchment);
  opacity:.85;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 28px;
  padding-top:24px;
  border-top:1px solid rgba(201,165,74,.16);
  font-size:13px;
  color:rgba(242,234,217,.55);
}
.footer-cert{
  font-family:var(--font-mono);
  letter-spacing:.06em;
}
.footer-sign{
  letter-spacing:.03em;
}
.footer-year{
  margin-left:auto;
  font-family:var(--font-mono);
}

/* ============ Responsive: footer ============ */
@media (max-width: 980px){
  .site-footer{
    margin-left:0;
    width:100%;
  }
}
@media (max-width: 800px){
  .footer-grid{
    grid-template-columns:1fr;
    gap:28px;
  }
  .footer-inner{
    padding:36px 24px 24px;
  }
}
@media (min-width: 801px) and (max-width: 1080px){
  .footer-grid{
    grid-template-columns:1fr 1fr;
  }
}

/* ============ Shared Components ============ */
.page-heading{
  margin-bottom:32px;
}
.page-heading h1{
  font-family:var(--font-serif);
  font-size:42px;
  line-height:1.2;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--ink);
  margin-bottom:8px;
}
.page-intro{
  font-size:17px;
  color:var(--ink-muted);
  max-width:640px;
}
.breadcrumb{
  margin-bottom:24px;
  font-size:13px;
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  color:var(--ink-muted);
}
.breadcrumb-item{
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";
  font-family:var(--font-mono);
  color:var(--gold);
}
.breadcrumb-item a{
  color:var(--celadon);
}
.breadcrumb-item a:hover{
  color:var(--cinnabar);
}
.breadcrumb-current{
  color:var(--ink);
  font-weight:600;
}
.prose-container{
  max-width:820px;
  font-size:16px;
  line-height:1.85;
  color:var(--ink);
}
.prose-container p{
  margin-bottom:20px;
}
.prose-container h2,
.prose-container h3{
  font-family:var(--font-serif);
  color:var(--ink);
  margin-top:36px;
  margin-bottom:12px;
  font-weight:700;
  letter-spacing:.03em;
}
.prose-container h2{
  font-size:28px;
  padding-bottom:8px;
  border-bottom:2px solid var(--line-pale);
}
.prose-container h3{
  font-size:22px;
}
.prose-container a{
  color:var(--celadon);
  text-decoration:underline;
  text-underline-offset:4px;
}
.prose-container a:hover{
  color:var(--cinnabar);
}

/* buttons */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 28px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  border-radius:6px;
  background:var(--mist);
  color:var(--ink);
  transition:background var(--transition-base), color var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  text-decoration:none;
  border:1.5px solid transparent;
  line-height:1.2;
}
.btn-primary{
  background:var(--cinnabar);
  color:var(--white);
  box-shadow:0 2px 8px rgba(195,39,43,.22);
}
.btn-primary:hover{
  background:#a52024;
  box-shadow:0 4px 18px rgba(195,39,43,.34);
  color:var(--white);
}
.btn-ghost{
  background:transparent;
  border-color:var(--gold);
  color:var(--ink);
}
.btn-ghost:hover{
  background:rgba(201,165,74,.14);
  color:var(--ink);
}

/* tags */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  border-radius:100px;
  line-height:1.5;
}
.tag-gold{
  background:rgba(201,165,74,.12);
  border:1px solid rgba(201,165,74,.45);
  color:#7a6130;
}
.tag-teal{
  background:rgba(123,163,161,.12);
  border:1px solid rgba(123,163,161,.4);
  color:#3f6f6c;
}

/* section titles */
.section-title{
  font-family:var(--font-serif);
  font-size:30px;
  font-weight:700;
  color:var(--ink);
  letter-spacing:.04em;
  display:flex;
  align-items:center;
  gap:16px;
  margin-bottom:12px;
}
.section-title-mark{
  display:inline-block;
  width:28px;
  height:28px;
  border:2px solid var(--gold);
  border-radius:6px;
  transform:rotate(45deg);
  flex-shrink:0;
  position:relative;
  background:rgba(201,165,74,.1);
}
.section-title-mark::after{
  content:"";
  position:absolute;
  inset:5px;
  border:1px solid var(--cinnabar);
  border-radius:2px;
}
.section-caption{
  font-size:15px;
  color:var(--ink-muted);
  margin-bottom:28px;
  max-width:640px;
}

/* board grid: modular card layout */
.board-grid{
  display:grid;
  grid-template-columns:repeat(12, 1fr);
  gap:20px;
}
.board-card{
  grid-column: span 4;
  background:var(--white);
  border:1px solid var(--line-ink);
  border-radius:var(--radius);
  box-shadow:var(--shadow-card);
  padding:24px;
  position:relative;
  transition:transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}
.board-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-lift);
  border-color:var(--pale-gold);
}
.card-elevate{
  will-change:transform;
}
.card-elevate:hover{
  transform:translateY(-6px);
  box-shadow:var(--shadow-lift);
}
/* irregular placement via utility applied per page */
.board-card.wide{
  grid-column:span 6;
}
.board-card.narrow{
  grid-column:span 3;
}
.board-card.offset-right{
  transform:translateX(24px);
}
.board-card.offset-left{
  transform:translateX(-16px);
}
.board-card.offset-down{
  transform:translateY(24px);
}

/* divider */
.divider-board{
  height:14px;
  border-top:1px solid var(--line-pale);
  border-bottom:1px solid var(--line-ink);
  background:repeating-linear-gradient(90deg, transparent 0 16px, rgba(201,165,74,.25) 16px 18px, transparent 18px 32px, rgba(26,26,26,.06) 32px 34px);
  margin:56px 0;
}

/* image frame base: placeholder for page images */
.image-frame{
  position:relative;
  border-radius:8px;
  overflow:hidden;
  background:var(--mist);
  border:1px solid var(--pale-gold);
  aspect-ratio:4/3;
}
.image-frame-lg{
  aspect-ratio:16/10;
}
.image-frame-sm{
  aspect-ratio:1/1;
}
/* -- decorative grid overlay for image frames -- */
.image-frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(26,26,26,.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,26,26,.08) 1px, transparent 1px);
  background-size:24px 24px;
  opacity:.5;
  z-index:1;
  pointer-events:none;
}
.image-frame::after{
  content:"";
  position:absolute;
  top:10%;
  right:8%;
  width:24%;
  height:24%;
  border:2px solid rgba(201,165,74,.5);
  border-radius:4px;
  transform:rotate(45deg);
  opacity:.6;
  z-index:2;
  pointer-events:none;
}
.image-placeholder{
  position:absolute;
  inset:0;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:rgba(26,26,26,.5);
  z-index:0;
  background:
    radial-gradient(circle at 30% 40%, rgba(201,165,74,.18) 0%, transparent 40%),
    radial-gradient(circle at 70% 70%, rgba(123,163,161,.14) 0%, transparent 30%);
}

/* reveal */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .55s ease, transform .55s ease;
}
.reveal.is-revealed{
  opacity:1;
  transform:translateY(0);
}
@media (prefers-reduced-motion: reduce){
  .reveal{
    opacity:1;
    transform:none;
    transition:none;
  }
}

/* responsive shared */
@media (max-width: 900px){
  .board-grid{
    gap:16px;
  }
  .board-card,
  .board-card.wide,
  .board-card.narrow,
  .board-card.offset-right,
  .board-card.offset-left,
  .board-card.offset-down{
    grid-column:span 6;
    transform:none;
  }
  .page-shell{
    padding:36px 24px 60px;
  }
}
@media (max-width: 600px){
  .board-card,
  .board-card.wide,
  .board-card.narrow{
    grid-column:span 12;
    transform:none;
  }
  .page-heading h1{
    font-size:32px;
  }
  .section-title{
    font-size:24px;
  }
  .header-inner{
    padding:0 14px;
  }
  .brand-title{
    font-size:18px;
  }
  .brand-sub{
    font-size:11px;
  }
  .brand-mark{
    width:36px;
    height:36px;
  }
  .section-indicator{
    display:none;
  }
  .page-shell{
    padding:28px 16px 48px;
  }
}

/* header / nav mobile specific refinements */
@media (max-width: 980px){
  .brand-sub{
    letter-spacing:.16em;
  }
}
@media (max-width: 380px){
  .brand-sub{
    display:none;
  }
}
/* ============ Footer small ============ */
@media (max-width: 600px){
  .footer-bottom{
    flex-direction:column;
    align-items:flex-start;
    gap:6px;
  }
  .footer-year{
    margin-left:0;
  }
  .footer-contact li{
    font-size:13px;
  }
}