/* ===== Datum Guides — shared stylesheet ===== */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,600;8..60,700&family=Public+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:      #132339;
  --ink-70:   #132339b3;
  --paper:    #EEEDE7;
  --paper-2:  #E4E2D9;
  --slate:    #3C4148;
  --slate-60: #3c4148a3;
  --amber:    #C67A2E;
  --line:     #C9C7BE;
  --line-dk:  #9a988e;

  --serif: 'Source Serif 4', Georgia, serif;
  --sans:  'Public Sans', -apple-system, Segoe UI, sans-serif;
  --mono:  'IBM Plex Mono', ui-monospace, Menlo, monospace;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--paper);
  color:var(--slate);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

a{ color:inherit; }
a:focus-visible, button:focus-visible{ outline:2px solid var(--amber); outline-offset:3px; }

/* --- drafting grid backdrop, used sparingly --- */
.grid-field{
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
  background-position:-1px -1px;
  opacity:0.35;
}

/* --- top nav --- */
.site-nav{
  background:var(--ink);
  color:var(--paper);
  padding:16px 32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.site-nav .wordmark{
  font-family:var(--serif);
  font-size:19px;
  letter-spacing:0.01em;
  text-decoration:none;
  color:var(--paper);
}
.site-nav .wordmark b{ font-weight:700; }
.site-nav .nav-links{
  display:flex;
  gap:28px;
  font-family:var(--sans);
  font-size:14px;
}
.site-nav .nav-links a{
  text-decoration:none;
  color:var(--paper);
  opacity:0.75;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
}
.site-nav .nav-links a:hover{ opacity:1; color:var(--amber); }
.site-nav .nav-links a.active{
  opacity:1;
  border-bottom-color:var(--amber);
}
@media (max-width:520px){
  .site-nav{ flex-direction:column; align-items:flex-start; gap:10px; }
  .site-nav .nav-links{ gap:18px; }
}

/* --- hero / landing header --- */
.hero{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  padding:88px 32px 72px;
  overflow:hidden;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(#ffffff14 1px, transparent 1px),
    linear-gradient(90deg, #ffffff14 1px, transparent 1px);
  background-size:56px 56px;
}
.hero-inner{ position:relative; max-width:760px; margin:0 auto; }
.hero-eyebrow{
  font-family:var(--sans);
  font-size:12.5px;
  letter-spacing:0.12em;
  text-transform:uppercase;
  color:var(--amber);
  margin:0 0 18px;
}
.hero h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(34px,5vw,50px);
  line-height:1.12;
  margin:0 0 20px;
}
.hero p{
  font-size:17px;
  color:#EEEDE7cc;
  max-width:56ch;
  margin:0;
}

/* --- guide index --- */
.index-wrap{ max-width:860px; margin:0 auto; padding:56px 32px 96px; }
.index-heading{
  display:flex; align-items:baseline; justify-content:space-between;
  border-bottom:1px solid var(--line-dk);
  padding-bottom:14px; margin-bottom:6px;
}
.index-heading h2{
  font-family:var(--serif); font-size:22px; font-weight:600; margin:0;
}
.index-count{ font-family:var(--sans); font-size:12.5px; color:var(--slate-60); }

.entry{
  display:grid;
  grid-template-columns:104px 1fr auto;
  gap:20px;
  align-items:start;
  padding:26px 0;
  border-bottom:1px solid var(--line);
  text-decoration:none;
  color:inherit;
}
.entry:hover .entry-title{ color:var(--amber); }
.entry-ref{
  font-family:var(--sans);
  font-size:12px;
  color:var(--slate-60);
  padding-top:4px;
}
.entry-title{
  font-family:var(--serif);
  font-size:20px;
  font-weight:600;
  margin:0 0 6px;
  transition:color 0.15s ease;
}
.entry-desc{ font-size:14.5px; color:var(--slate-60); margin:0; max-width:56ch; }
.entry-meta{
  font-family:var(--sans);
  font-size:11.5px;
  text-transform:uppercase;
  letter-spacing:0.06em;
  color:var(--slate-60);
  text-align:right;
  white-space:nowrap;
  padding-top:5px;
}
.tag{
  display:inline-block;
  border:1px solid var(--line-dk);
  border-radius:2px;
  padding:2px 7px;
  margin-left:6px;
  color:var(--slate);
}
.tag.pdf{ border-color:var(--amber); color:var(--amber); }

@media (max-width:640px){
  .entry{ grid-template-columns:1fr; gap:6px; }
  .entry-meta{ text-align:left; }
}

/* --- guide page (report layout) --- */
.report{ max-width:760px; margin:0 auto; padding:0 32px 100px; }
.report-head{
  border-bottom:2px solid var(--ink);
  padding:48px 0 24px;
}
.report-code{
  font-family:var(--sans);
  font-size:12.5px;
  letter-spacing:0.06em;
  color:var(--amber);
  margin:0 0 14px;
}
.report-head h1{
  font-family:var(--serif);
  font-size:clamp(28px,4vw,38px);
  line-height:1.18;
  margin:0 0 16px;
}
.report-meta{
  display:flex; flex-wrap:wrap; gap:18px;
  font-family:var(--sans);
  font-size:12px;
  color:var(--slate-60);
  text-transform:uppercase;
  letter-spacing:0.04em;
}

.report-body{
  display:grid;
  grid-template-columns:120px 1fr;
  gap:32px;
  padding-top:40px;
}
.rail{ font-family:var(--sans); font-size:11.5px; color:var(--slate-60); line-height:1.7; }
.rail .note{
  border-left:2px solid var(--amber);
  padding-left:10px;
  margin-bottom:28px;
}
.content h2{
  font-family:var(--serif);
  font-size:21px;
  font-weight:600;
  color:var(--ink);
  margin:34px 0 12px;
}
.content h2:first-child{ margin-top:0; }
.content p{ margin:0 0 16px; font-size:15.5px; }
.content ul, .content ol{ margin:0 0 16px; padding-left:20px; }
.content li{ margin-bottom:8px; font-size:15.5px; }
.content .callout{
  background:var(--paper-2);
  border-left:3px solid var(--amber);
  padding:14px 18px;
  font-size:14.5px;
  margin:20px 0;
}

.pdf-box{
  display:flex; align-items:center; gap:14px;
  background:var(--ink);
  color:var(--paper);
  padding:18px 20px;
  margin:28px 0 8px;
  text-decoration:none;
  border-radius:2px;
}
.pdf-box:hover{ background:#1c3455; }
.pdf-icon{
  font-family:var(--sans); font-size:11px; font-weight:600;
  background:var(--amber); color:var(--ink);
  padding:3px 6px; border-radius:2px; letter-spacing:0.04em;
}
.pdf-box .pdf-label b{ display:block; font-family:var(--serif); font-size:15.5px; font-weight:600; }
.pdf-box .pdf-label span{ font-size:12.5px; color:#EEEDE7aa; }

@media (max-width:640px){
  .report-body{ grid-template-columns:1fr; }
  .rail{ display:flex; gap:24px; flex-wrap:wrap; }
  .rail .note{ margin-bottom:12px; }
}

footer{
  border-top:1px solid var(--line);
  padding:32px 32px 40px;
  font-family:var(--sans);
  text-align:center;
}
footer p{ margin:0 0 6px; }
footer .copyright{ font-size:12px; color:var(--slate); }
footer .disclaimer{ font-size:11.5px; color:var(--slate-60); max-width:56ch; margin:0 auto; }