/* Shared stylesheet for every page. Page-specific accent colour is set by
   the `theme` front-matter key, rendered as `theme-<name>` on <main>. */

:root{
  --bg: #eef1f4;
  --surface: #ffffff;
  --text: #12151a;
  --text-soft: #33404a;
  --text-dim: #5b6470;
  --line: rgba(20,25,35,0.11);
  --accent: #c31c85;
  --accent-soft: #f6e3ef;
  --turquoise: #0d94a1;
  --turquoise-soft: #e0f3f4;
  --shadow: 0 20px 50px rgba(20,25,35,0.10);
  --radius: 12px;
}
*{ box-sizing: border-box; }
body{
  margin:0; background: var(--bg); color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  line-height: 1.6;
}
h1,h2,.brand-text{ font-family:"Space Grotesk","IBM Plex Sans",sans-serif; margin:0; color:var(--text); }
a{ color: inherit; }
img,svg{ display:block; }
.wrap{ max-width: 860px; margin: 0 auto; padding: 0 32px; }

/* ---------- header / footer (sub-page variant) ---------- */
header{ background: rgba(238,241,244,0.9); }
header::after{ content:""; display:block; height:3px; background: linear-gradient(90deg, #9aa3ad, var(--turquoise), var(--accent)); }
header .wrap{ display:flex; align-items:center; justify-content:space-between; height:76px; }
.brand{ display:flex; align-items:center; gap:12px; }
.brand img{ height:42px; width:auto; }
.brand-text{ font-size:19px; font-weight:700; letter-spacing:-0.01em; }
.brand-text small{
  display:block; font-family:"IBM Plex Sans",sans-serif;
  font-weight:500; font-size:13px; color:var(--text-dim); letter-spacing: 0.02em;
}
.back{ font-size:14.5px; font-weight:600; color:var(--text-dim); text-decoration:none; }
.back:hover{ color:var(--text); }

footer{ border-top:1px solid var(--line); padding:22px 0; }
footer .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px; }
footer, footer a{ font-size:13.5px; color:var(--text-dim); }

/* ---------- content page scaffold ---------- */
main{ padding: 48px 0 80px; }
.badge{
  display:inline-block; font-size:13.5px; font-weight:600; color:#fff;
  padding:6px 14px; border-radius:16px; margin-bottom:18px;
}
.theme-turquoise .badge{ background: var(--turquoise); }
.theme-magenta .badge{ background: var(--accent); }
.theme-gray .badge{ background: #6b7480; }
h1{ font-size: 32px; font-weight:700; letter-spacing:-0.01em; margin-bottom:14px; }
.lead{ font-size:17px; color:var(--text-soft); max-width:620px; }

/* ---------- cards, info blocks, references ---------- */
.card{
  margin-top:36px; background:var(--surface); border:1px solid var(--line);
  border-radius:var(--radius); box-shadow:var(--shadow); padding:34px 36px;
}
.card h2{ font-size:18px; font-weight:700; margin-bottom:10px; }
.card p{ font-size:15px; color:var(--text-dim); margin:0; }

.content-block{ margin-top:32px; }
.content-block h2{ font-size:18px; font-weight:700; margin:0 0 10px; }
.content-block .sub{ font-size:15.5px; color:var(--text-dim); margin:0 0 14px; }
.content-block ul, .content-block ol{ margin:0; padding-left:20px; }
.content-block ol{ list-style:decimal; }
.content-block li{ font-size:15.5px; line-height:1.6; color:var(--text-dim); margin-bottom:7px; }
.content-block li b{ color:var(--text); }
.content-block .empty{ color:var(--text-dim); font-size:15px; font-style:italic; }
.refs-note{ font-size:14px; color:var(--text-dim); margin:0 0 20px; }
.refs-inline{ font-size:15px; color:var(--text-dim); margin:0; }

/* ---------- tabs ---------- */
.tabs{
  display:flex; gap:22px; margin-top:30px;
  border-bottom:1px solid var(--line);
}
.tab-btn{
  appearance:none; background:none; border:none; cursor:pointer;
  font-family:"IBM Plex Sans",sans-serif; font-size:15.5px; font-weight:600;
  color:var(--text-dim); padding:10px 2px 12px;
  border-bottom:2px solid transparent;
}
.tab-btn.active{ color:var(--text); }
.theme-turquoise .tab-btn.active{ border-bottom-color: var(--turquoise); }
.theme-magenta .tab-btn.active{ border-bottom-color: var(--accent); }
.theme-gray .tab-btn.active{ border-bottom-color: #6b7480; }
.tab-panel{ display:none; padding-top: 30px; }
.tab-panel.active{ display:block; }
.tab-panel > .content-block:first-child{ margin-top:0; }