/* ==========================================================================
   KHERAD — stylesheet
   Design language: architectural drafting sheet meets research archive.
   Mono for data and annotation (drafting labels), geometric sans for
   structure, serif for long-form reading. Small type, large whitespace.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Space+Grotesk:wght@400;500;600&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;1,8..60,400&display=swap');

:root{
  /* surface */
  --paper:#FBFAF7;
  --paper-warm:#F4F2ED;
  --paper-pure:#FFFFFF;

  /* ink */
  --ink:#161614;
  --ink-soft:#55534C;
  --ink-faint:#8E8B82;
  --ink-ghost:#B8B4AA;

  /* structure */
  --line:#E6E2D9;
  --line-soft:#EFEDE6;

  /* signal — used sparingly */
  --accent:#0F7A80;
  --accent-soft:#E3F0EF;
  --fail:#A8452F;
  --fail-soft:#F6EAE6;
  --mixed:#8A6A1F;
  --mixed-soft:#F7F1E0;

  /* type */
  --mono:'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;
  --sans:'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --serif:'Source Serif 4', Georgia, serif;

  /* measure */
  --measure:640px;
  --measure-wide:1000px;
  --gutter:32px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

a{
  color:inherit;
  text-decoration:none;
  border-bottom:1px solid var(--line);
  transition:border-color .18s ease, color .18s ease;
}
a:hover{color:var(--accent); border-color:var(--accent);}

::selection{background:var(--accent-soft);}

/* ---------- layout ---------- */
.wrap{max-width:var(--measure); margin:0 auto; padding:0 var(--gutter);}
.wrap-wide{max-width:var(--measure-wide); margin:0 auto; padding:0 var(--gutter);}

main{min-height:60vh;}

section{padding:96px 0;}
section + section{padding-top:0;}
section.alt{
  background:var(--paper-warm);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:96px 0;
}

/* ---------- sticky header ---------- */
header.site{
  position:sticky; top:0; z-index:60;
  background:rgba(251,250,247,.88);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line-soft);
}
header.site .bar{
  max-width:var(--measure-wide); margin:0 auto;
  padding:20px var(--gutter);
  display:flex; align-items:center; justify-content:space-between;
  gap:24px;
}
header.site .logo{
  font-family:var(--mono);
  font-size:.82rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ink);
  border:none;
  white-space:nowrap;
}
header.site .logo:hover{color:var(--accent);}
header.site nav{display:flex; gap:26px; flex-wrap:wrap;}
header.site nav a{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
  border:none;
  padding-bottom:2px;
}
header.site nav a:hover{color:var(--ink);}
header.site nav a.active{
  color:var(--ink);
  border-bottom:1px solid var(--accent);
}

/* ---------- hero ---------- */
.hero{padding:140px 0 100px; text-align:center;}
.hero .rule{width:40px; height:1px; background:var(--accent); margin:0 auto 36px;}
.hero .rule.bottom{margin:36px auto 40px;}
.hero h1{
  font-family:var(--sans);
  font-weight:500;
  font-size:clamp(1.9rem, 4.2vw, 2.9rem);
  line-height:1.2;
  letter-spacing:-.02em;
  margin:0;
  text-wrap:balance;
}
.hero p.lede{
  font-family:var(--serif);
  font-size:1.02rem;
  line-height:1.8;
  color:var(--ink-soft);
  max-width:560px;
  margin:0 auto;
  text-wrap:pretty;
}
.meta-line{
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin-top:40px;
}

/* ---------- section headings ---------- */
p.section-kicker{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--ink-ghost);
  margin:0 0 18px;
}
h2.section-title{
  font-family:var(--sans);
  font-size:1.5rem;
  font-weight:500;
  letter-spacing:-.015em;
  margin:0 0 20px;
  line-height:1.3;
}
p.section-sub{
  font-family:var(--serif);
  font-size:1rem;
  line-height:1.8;
  color:var(--ink-soft);
  max-width:var(--measure);
  margin:0 0 44px;
  text-wrap:pretty;
}

/* ---------- principle list (replaces boxed cards) ---------- */
.principles{border-top:1px solid var(--line);}
.principle{
  display:grid;
  grid-template-columns:88px 1fr;
  gap:28px;
  padding:26px 0;
  border-bottom:1px solid var(--line);
  align-items:start;
}
.principle .idx{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--ink-ghost);
  padding-top:.35em;
  white-space:nowrap;
}
.principle h3{
  font-family:var(--sans);
  font-size:.98rem;
  font-weight:500;
  margin:0 0 6px;
  letter-spacing:-.01em;
}
.principle p{
  font-family:var(--serif);
  font-size:.94rem;
  line-height:1.75;
  color:var(--ink-soft);
  margin:0;
  max-width:52ch;
}

/* ---------- instrument rows ---------- */
.rows{border-top:1px solid var(--line);}
.row-item{
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  padding:26px 0;
  border-bottom:1px solid var(--line);
  align-items:baseline;
}
.row-item h3{
  font-family:var(--sans);
  font-size:1rem;
  font-weight:500;
  margin:0 0 8px;
  letter-spacing:-.01em;
}
.row-item p{
  font-family:var(--serif);
  font-size:.94rem;
  line-height:1.75;
  color:var(--ink-soft);
  margin:0;
  max-width:56ch;
}
.row-item .status{
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink-ghost);
  white-space:nowrap;
}
.row-item .status.live{color:var(--accent);}
.row-item .status.soon{color:var(--mixed);}

/* ---------- epoch ladder ---------- */
.ladder{
  display:flex;
  flex-wrap:wrap;
  gap:10px 0;
  font-family:var(--mono);
  font-size:.7rem;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--ink-soft);
  margin:0 0 40px;
}
.ladder span{white-space:nowrap;}
.ladder .sep{color:var(--ink-ghost); padding:0 12px;}

/* ---------- data chips ---------- */
.chip{
  display:inline-block;
  font-family:var(--mono);
  font-size:.62rem;
  font-weight:500;
  letter-spacing:.1em;
  text-transform:uppercase;
  padding:2px 7px;
  border:1px solid var(--line);
  border-radius:2px;
  color:var(--ink-soft);
  background:var(--paper-pure);
}
.chip.pass{color:var(--accent); border-color:#B9D9D7; background:var(--accent-soft);}
.chip.fail{color:var(--fail); border-color:#E0BDB2; background:var(--fail-soft);}
.chip.mixed{color:var(--mixed); border-color:#DECFA4; background:var(--mixed-soft);}
.chip.note{color:var(--ink-faint); background:var(--paper-warm);}

/* ---------- exhibited figure ---------- */
figure.exhibit{margin:48px 0; text-align:center;}
figure.exhibit img{
  max-width:100%;
  height:auto;
  border:1px solid var(--line);
  background:var(--paper-pure);
  padding:14px;
}
figure.exhibit figcaption{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.06em;
  color:var(--ink-faint);
  margin-top:16px;
  line-height:1.6;
}

/* ---------- timeline ---------- */
.timeline{position:relative; padding-left:28px; margin-top:8px;}
.timeline::before{
  content:'';
  position:absolute; left:3px; top:10px; bottom:10px;
  width:1px; background:var(--line);
}
.t-era{
  position:relative;
  margin:56px 0 28px;
  padding-left:0;
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--ink-ghost);
}
.t-era:first-child{margin-top:8px;}
.t-era::before{
  content:'';
  position:absolute; left:-28px; top:.55em;
  width:7px; height:7px;
  background:var(--paper);
  border:1px solid var(--ink-ghost);
  transform:rotate(45deg);
}
.t-entry{position:relative; padding:0 0 26px;}
.t-entry::before{
  content:'';
  position:absolute; left:-28px; top:.5em;
  width:7px; height:7px; border-radius:50%;
  background:var(--ink-ghost);
  box-shadow:0 0 0 3px var(--paper);
}
.t-entry.pass::before{background:var(--accent);}
.t-entry.fail::before{background:var(--fail);}
.t-entry.mixed::before{background:var(--mixed);}
.t-entry .t-date{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.08em;
  color:var(--ink-ghost);
  display:flex; align-items:center; gap:10px;
}
.t-entry .t-title{
  font-family:var(--serif);
  font-size:1rem;
  line-height:1.6;
  margin:6px 0 0;
  color:var(--ink);
  max-width:64ch;
}
.t-entry .t-title .id{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.1em;
  color:var(--ink-faint);
  margin-right:12px;
  text-transform:uppercase;
}
.t-entry.fail .t-title{color:var(--ink);}

/* legend */
.legend{
  display:flex; flex-wrap:wrap; gap:10px;
  font-family:var(--mono); font-size:.66rem;
  letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-faint);
  margin-top:32px;
  align-items:center;
}

/* ---------- field-note list ---------- */
.note-row{
  display:grid;
  grid-template-columns:1fr auto;
  gap:28px;
  padding:26px 0;
  border-bottom:1px solid var(--line);
  align-items:baseline;
}
.note-row:first-child{border-top:1px solid var(--line);}
.note-row h3{
  font-family:var(--sans);
  font-size:1rem;
  font-weight:500;
  margin:0;
  letter-spacing:-.01em;
}
.note-row h3 a{border:none;}
.note-row p{
  font-family:var(--serif);
  font-size:.92rem;
  line-height:1.7;
  color:var(--ink-soft);
  margin:8px 0 0;
  max-width:58ch;
}
.note-row .date{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.08em;
  color:var(--ink-ghost);
  white-space:nowrap;
}

/* ---------- prose ---------- */
.prose{padding:120px 0 140px;}
.prose h1{
  font-family:var(--sans);
  font-size:clamp(1.7rem, 3.4vw, 2.2rem);
  font-weight:500;
  letter-spacing:-.02em;
  line-height:1.25;
  margin:0 0 12px;
  text-wrap:balance;
}
.prose .byline{
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink-ghost);
  margin-bottom:56px;
}
.prose h2{
  font-family:var(--sans);
  font-size:1.15rem;
  font-weight:500;
  letter-spacing:-.01em;
  margin:56px 0 0;
  padding-top:28px;
  border-top:1px solid var(--line);
}
.prose h3{
  font-family:var(--sans);
  font-size:1rem;
  font-weight:500;
  margin:36px 0 0;
}
.prose p{
  font-family:var(--serif);
  font-size:1.02rem;
  line-height:1.8;
  color:var(--ink);
  margin:20px 0;
  text-wrap:pretty;
}
.prose ul, .prose ol{
  font-family:var(--serif);
  font-size:1.02rem;
  line-height:1.8;
  color:var(--ink);
  padding-left:1.2em;
}
.prose li{margin:8px 0;}
.prose strong{font-weight:600;}
.prose em{font-style:italic;}
.prose code{
  font-family:var(--mono);
  font-size:.84em;
  background:var(--paper-warm);
  padding:2px 5px;
  border-radius:2px;
}
.prose pre{
  font-family:var(--mono);
  font-size:.78rem;
  line-height:1.7;
  background:var(--paper-warm);
  border:1px solid var(--line);
  padding:20px;
  overflow-x:auto;
  border-radius:2px;
}
.prose pre code{background:none; padding:0;}
.prose blockquote{
  border-left:1px solid var(--accent);
  margin:32px 0;
  padding:2px 0 2px 24px;
  font-family:var(--serif);
  font-style:italic;
  color:var(--ink-soft);
}
.prose table{
  width:100%;
  border-collapse:collapse;
  font-family:var(--mono);
  font-size:.76rem;
  margin:28px 0;
}
.prose table th, .prose table td{
  border-bottom:1px solid var(--line);
  padding:10px 12px;
  text-align:left;
}
.prose table th{
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
  font-size:.66rem;
  color:var(--ink-faint);
  border-bottom-color:var(--ink-ghost);
}
.prose hr{border:none; border-top:1px solid var(--line); margin:48px 0;}
.prose img{max-width:100%; height:auto; border:1px solid var(--line);}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;
  font-family:var(--mono);
  font-size:.68rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  padding:11px 20px;
  border:1px solid var(--line);
  color:var(--ink-soft);
  border-radius:2px;
  background:var(--paper-pure);
}
.btn:hover{border-color:var(--ink); color:var(--ink); background:var(--paper-pure);}
.btn.accent{border-color:var(--accent); color:var(--accent);}
.btn.accent:hover{background:var(--accent); color:var(--paper-pure); border-color:var(--accent);}

.contact-links{display:flex; gap:12px; margin-top:28px; flex-wrap:wrap;}

/* ---------- verify box ---------- */
.verify-box{
  margin-top:44px;
  padding:28px;
  border:1px solid var(--line);
  background:var(--paper-warm);
  max-width:420px;
  border-radius:2px;
}
.verify-box .verify-label{
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-faint);
  margin:0 0 16px;
}
.verify-box .verify-result{
  font-family:var(--mono);
  font-size:.8rem;
  margin-top:18px;
  color:var(--ink-faint);
}

/* ==========================================================================
   FOOTERS — a full sitemap footer, plus the persistent sticky bar
   ========================================================================== */

/* full footer */
footer.full{
  border-top:1px solid var(--line);
  background:var(--paper-warm);
  padding:80px 0 64px;
}
footer.full .inner{
  max-width:var(--measure-wide);
  margin:0 auto;
  padding:0 var(--gutter);
}
footer.full .top{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:48px;
  padding-bottom:56px;
  border-bottom:1px solid var(--line);
}
footer.full .brand .mark{
  font-family:var(--mono);
  font-size:.82rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ink);
  display:block;
  margin-bottom:16px;
}
footer.full .brand .tagline{
  font-family:var(--serif);
  font-size:.98rem;
  line-height:1.75;
  color:var(--ink-soft);
  margin:0;
  max-width:34ch;
  text-wrap:pretty;
}
footer.full .brand .tagline em{font-style:italic; color:var(--ink);}
footer.full h4{
  font-family:var(--mono);
  font-size:.64rem;
  font-weight:500;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-ghost);
  margin:0 0 18px;
}
footer.full ul{list-style:none; margin:0; padding:0;}
footer.full li{margin:0 0 11px;}
footer.full li a{
  font-family:var(--sans);
  font-size:.86rem;
  color:var(--ink-soft);
  border:none;
}
footer.full li a:hover{color:var(--accent);}
footer.full .bottom{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:20px;
  flex-wrap:wrap;
  padding-top:28px;
  font-family:var(--mono);
  font-size:.66rem;
  letter-spacing:.08em;
  color:var(--ink-ghost);
}
footer.full .bottom .legal{display:flex; gap:20px; flex-wrap:wrap;}

/* sticky bar — pinned to viewport bottom */
footer.sticky{
  position:fixed; bottom:0; left:0; right:0; z-index:50;
  border-top:1px solid var(--line);
  background:rgba(251,250,247,.9);
  backdrop-filter:saturate(180%) blur(12px);
  -webkit-backdrop-filter:saturate(180%) blur(12px);
}
/* reserve room so the fixed bar never covers the full footer */
body{padding-bottom:46px;}
footer.sticky .bar{
  max-width:var(--measure-wide); margin:0 auto;
  padding:12px var(--gutter);
  display:flex; align-items:center; justify-content:space-between;
  gap:20px;
  font-family:var(--mono);
  font-size:.64rem;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--ink-ghost);
}
footer.sticky .bar .left{display:flex; gap:18px; align-items:center; min-width:0;}
footer.sticky .bar .motto{
  color:var(--ink-faint);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
footer.sticky .bar a{border:none; color:var(--ink-ghost); margin-left:18px;}
footer.sticky .bar a:hover{color:var(--accent);}

/* ---------- responsive ---------- */
@media (max-width:900px){
  footer.full .top{grid-template-columns:1fr 1fr; gap:40px;}
  footer.full .brand{grid-column:1 / -1;}
}
@media (max-width:760px){
  :root{--gutter:22px;}
  body{font-size:14.5px;}
  section, section.alt{padding:64px 0;}
  .hero{padding:88px 0 64px;}
  header.site .bar{flex-direction:column; align-items:flex-start; gap:12px; padding:16px var(--gutter);}
  header.site nav{gap:18px;}
  .prose{padding:72px 0 96px;}
  .principle{grid-template-columns:1fr; gap:8px;}
  .principle .idx{padding-top:0;}
  .row-item{grid-template-columns:1fr; gap:10px;}
  .note-row{grid-template-columns:1fr; gap:6px;}
  .note-row .date{order:-1;}
  footer.full{padding:56px 0 40px;}
  footer.full .top{grid-template-columns:1fr; gap:36px; padding-bottom:40px;}
  footer.sticky .bar .motto{display:none;}
  .ladder .sep{padding:0 8px;}
}
@media (max-width:420px){
  footer.sticky .bar{font-size:.6rem; letter-spacing:.06em;}
  footer.sticky .bar a{margin-left:12px;}
}