/* ═══════════════════════════════════════════════════
   GEOMed360 — shared brand stylesheet
   ═══════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink: #0F172A; --bg: #F8FAFC; --surface: #FFFFFF;
  --teal: #0891B2; --teal-mid: #0E7490; --teal-light: #E0F2FE; --teal-bright: #22D3EE;
  --purple: #7C3AED; --purple-dark: #6D28D9; --purple-soft: #A78BFA; --purple-light: #EDE9FE;
  --body-text: #475569; --muted: #94A3B8; --border: #E2E8F0;
  --radius: 12px; --radius-lg: 16px;
}

html { scroll-behavior: smooth; overflow-x: hidden; }
body { font-family:'Inter',system-ui,sans-serif; background:var(--bg); color:var(--ink); line-height:1.6; -webkit-font-smoothing:antialiased; width:100%; }

/* ══ Brand logo ══ */
.logo { font-family:'Sora',sans-serif; font-weight:700; letter-spacing:-0.02em; text-decoration:none; display:inline-flex; align-items:baseline; gap:2px; white-space:nowrap; }
.logo .bkt { color:var(--purple); font-size:1.24em; line-height:1; transform:translateY(0.04em); transition:transform .25s cubic-bezier(.34,1.56,.64,1); }
.logo:hover .bkt:first-child { transform:translateY(.04em) translateX(-2px); }
.logo:hover .bkt:last-child  { transform:translateY(.04em) translateX(2px); }
.logo .n360 { color:var(--teal); }
.logo--dark { color:#fff; } .logo--dark .bkt { color:var(--purple-soft); } .logo--dark .n360 { color:var(--teal-bright); }

/* ══ Nav ══ */
.nav { position:sticky; top:0; z-index:50; background:rgba(248,250,252,.88); backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px); border-bottom:1px solid var(--border); }
.nav__inner { max-width:1100px; margin:0 auto; padding:0 1.5rem; height:64px; display:flex; align-items:center; justify-content:space-between; }
.nav .logo { font-size:1.1875rem; color:var(--ink); }
.nav__links { display:flex; align-items:center; gap:1.5rem; }
.nav__link { font-size:.875rem; font-weight:500; color:var(--body-text); text-decoration:none; transition:color .15s; }
.nav__link:hover { color:var(--ink); }
.nav__cta { font-size:.875rem; font-weight:500; color:#fff; background:var(--ink); padding:.5rem 1.125rem; border-radius:7px; text-decoration:none; transition:background .2s; }
.nav__cta:hover { background:var(--purple); }

/* ══ Buttons ══ */
.btn-primary { display:inline-block; background:var(--purple); color:#fff; font-size:.9375rem; font-weight:500; padding:.8125rem 1.875rem; border-radius:8px; text-decoration:none; transition:background .2s,transform .15s,box-shadow .2s; box-shadow:0 4px 14px rgba(124,58,237,.28); }
.btn-primary:hover { background:var(--purple-dark); transform:translateY(-1px); box-shadow:0 6px 20px rgba(124,58,237,.38); }
.btn-ghost { display:inline-block; background:transparent; color:var(--ink); font-size:.9375rem; font-weight:500; padding:.8125rem 1.875rem; border-radius:8px; text-decoration:none; border:1.5px solid var(--border); transition:border-color .2s,background .2s; }
.btn-ghost:hover { border-color:var(--ink); background:rgba(15,23,42,.04); }
.btn-white { display:inline-block; background:#fff; color:var(--purple); font-size:.9375rem; font-weight:600; padding:.875rem 2.125rem; border-radius:8px; text-decoration:none; box-shadow:0 4px 16px rgba(0,0,0,.18); transition:transform .15s,box-shadow .2s; }
.btn-white:hover { transform:translateY(-2px); box-shadow:0 8px 28px rgba(0,0,0,.22); }

/* ══ Layout ══ */
.container { max-width:1100px; margin:0 auto; padding:0 1.5rem; }
.section-label { display:block; font-family:'JetBrains Mono',monospace; font-size:.68rem; font-weight:500; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); margin-bottom:.625rem; }
.section-label::before { content:'[ '; color:var(--purple); }
.section-label::after  { content:' ]'; color:var(--purple); }
.section-title { font-family:'DM Serif Display',serif; font-size:clamp(1.875rem,3.5vw,2.625rem); line-height:1.18; color:var(--ink); letter-spacing:-.02em; }
.section-intro { font-size:1.0625rem; color:var(--body-text); line-height:1.72; }

/* ══ Scroll reveal ══ */
.reveal { opacity:0; transform:translateY(22px); transition:opacity .65s ease,transform .65s ease; }
.reveal.in { opacity:1; transform:none; }
@media (prefers-reduced-motion:reduce){ .reveal{opacity:1;transform:none;transition:none;} }

/* ══ Hero (home) ══ */
.hero { position:relative; overflow:hidden; text-align:center; padding:6rem 1.5rem 5.5rem; }
.hero::before { content:''; position:absolute; inset:0; background:radial-gradient(ellipse 90% 70% at 50% -5%,rgba(124,58,237,.11) 0%,transparent 60%),radial-gradient(ellipse 55% 45% at 85% 90%,rgba(8,145,178,.09) 0%,transparent 65%); pointer-events:none; }
.hero__radar { position:absolute; top:54%; left:50%; width:860px; height:860px; transform:translate(-50%,-50%); pointer-events:none; }
.hero__radar-ring { position:absolute; inset:0; border-radius:50%; animation:radarExpand 4.2s ease-out infinite; }
.hero__radar-ring:nth-child(1){ border:1.5px solid rgba(8,145,178,.7); box-shadow:0 0 18px rgba(8,145,178,.25),inset 0 0 18px rgba(8,145,178,.08); animation-delay:0s; }
.hero__radar-ring:nth-child(2){ border:1.5px solid rgba(124,58,237,.55); box-shadow:0 0 18px rgba(124,58,237,.2),inset 0 0 18px rgba(124,58,237,.06); animation-delay:1.4s; }
.hero__radar-ring:nth-child(3){ border:1.5px solid rgba(8,145,178,.6); box-shadow:0 0 18px rgba(8,145,178,.22),inset 0 0 18px rgba(8,145,178,.07); animation-delay:2.8s; }
@keyframes radarExpand { 0%{transform:scale(.06);opacity:0;} 6%{opacity:1;} 70%{opacity:.45;} 100%{transform:scale(1);opacity:0;} }
.hero__radar-dot { position:absolute; top:50%; left:50%; width:14px; height:14px; background:var(--teal); border-radius:50%; transform:translate(-50%,-50%); animation:dotBreath 2.1s ease-in-out infinite; }
@keyframes dotBreath { 0%{box-shadow:0 0 0 0 rgba(8,145,178,.7),0 0 22px rgba(8,145,178,.5);} 50%{box-shadow:0 0 0 22px rgba(8,145,178,0),0 0 36px rgba(8,145,178,.7);} 100%{box-shadow:0 0 0 0 rgba(8,145,178,.7),0 0 22px rgba(8,145,178,.5);} }
@media (prefers-reduced-motion:reduce){ .hero__radar{display:none;} }
.hero__content { position:relative; }
.hero__eyebrow { display:inline-block; font-family:'JetBrains Mono',monospace; font-size:.7rem; font-weight:500; letter-spacing:.12em; text-transform:uppercase; color:var(--teal-mid); background:var(--teal-light); padding:.35rem .875rem; border-radius:100px; margin-bottom:1.75rem; }
.hero__kicker { font-family:'DM Serif Display',serif; font-size:clamp(1.25rem,2.6vw,1.75rem); color:var(--muted); letter-spacing:-.01em; margin-bottom:.5rem; }
.hero__title { font-family:'DM Serif Display',serif; font-size:clamp(2.375rem,5.8vw,4.25rem); line-height:1.1; color:var(--ink); max-width:860px; margin:0 auto 1.5rem; letter-spacing:-.02em; }
.hero__title em { font-style:italic; background:linear-gradient(125deg,var(--purple) 20%,var(--teal) 100%); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; }
.hero__subtitle { font-size:1.125rem; color:var(--body-text); max-width:600px; margin:0 auto 2.75rem; line-height:1.7; }
.hero__actions { display:flex; gap:.875rem; justify-content:center; flex-wrap:wrap; margin-bottom:2.5rem; }
.hero__llms-link { display:inline-flex; align-items:center; gap:.375rem; font-family:'JetBrains Mono',monospace; font-size:.75rem; color:var(--teal-mid); text-decoration:none; opacity:.8; transition:opacity .2s; }
.hero__llms-link:hover { opacity:1; }

/* ══ Home sections ══ */
.problem { background:var(--ink); padding:5.5rem 1.5rem; }
.problem__grid { display:grid; grid-template-columns:1fr 1fr; gap:4rem; align-items:center; }
.problem .section-label { color:var(--teal-bright); }
.problem .section-label::before,.problem .section-label::after { color:var(--purple-soft); }
.problem .section-title { color:#fff; margin-bottom:1.25rem; }
.problem__body { font-size:1.0625rem; color:#94A3B8; line-height:1.75; }
.problem__body strong { color:#E2E8F0; font-weight:600; }
.answer-window { background:rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.12); border-radius:var(--radius-lg); overflow:hidden; }
.answer-window__bar { display:flex; align-items:center; gap:6px; padding:.75rem 1.125rem; border-bottom:1px solid rgba(255,255,255,.08); }
.answer-window__dot { width:9px; height:9px; border-radius:50%; background:rgba(255,255,255,.18); }
.answer-window__bar-title { font-family:'JetBrains Mono',monospace; font-size:.7rem; color:#64748B; margin-left:8px; }
.answer-window__body { padding:1.375rem 1.375rem 1.5rem; }
.answer-window__q { font-size:.9rem; font-weight:500; color:#E2E8F0; background:rgba(255,255,255,.07); border-radius:10px; padding:.75rem 1rem; margin-bottom:1.125rem; }
.answer-window__a { font-size:.875rem; color:#94A3B8; line-height:1.7; margin-bottom:1.125rem; }
.answer-window__cites { display:flex; flex-wrap:wrap; gap:.5rem; align-items:center; }
.cite-chip { font-family:'JetBrains Mono',monospace; font-size:.72rem; padding:.3rem .7rem; border-radius:6px; background:rgba(255,255,255,.07); border:1px solid rgba(255,255,255,.12); color:#94A3B8; white-space:nowrap; }
.cite-chip--you { background:rgba(8,145,178,.18); border:1px solid rgba(34,211,238,.55); color:var(--teal-bright); font-weight:500; animation:chipGlow 2.4s ease-in-out infinite; }
@keyframes chipGlow { 0%,100%{box-shadow:0 0 0 0 rgba(34,211,238,0);} 50%{box-shadow:0 0 14px 1px rgba(34,211,238,.35);} }
@media (prefers-reduced-motion:reduce){ .cite-chip--you{animation:none;} }
.answer-window__caption { font-size:.8rem; color:#64748B; padding:.875rem 1.375rem; border-top:1px solid rgba(255,255,255,.08); line-height:1.55; }
.answer-window__caption em { color:var(--teal-bright); font-style:normal; font-weight:500; }

.geo-explainer { background:var(--surface); padding:5.5rem 1.5rem; }
.geo-explainer__grid { display:grid; grid-template-columns:1fr 1fr; gap:4.5rem; align-items:start; }
.geo-explainer .section-title { margin-bottom:1rem; }
.geo-explainer .section-intro { margin-bottom:1.75rem; }
.definition { border-left:3px solid var(--teal); border-radius:0 var(--radius) var(--radius) 0; background:var(--bg); padding:1.25rem 1.5rem; }
.definition__term { font-family:'JetBrains Mono',monospace; font-size:.72rem; font-weight:500; color:var(--teal-mid); letter-spacing:.08em; margin-bottom:.5rem; }
.definition__text { font-size:.925rem; color:var(--body-text); line-height:1.65; }
.comparison-wrap { overflow-x:auto; border:1px solid var(--border); border-radius:var(--radius); }
.comparison { width:100%; min-width:380px; border-collapse:collapse; }
.comparison caption { font-family:'JetBrains Mono',monospace; font-size:.68rem; font-weight:500; letter-spacing:.12em; text-transform:uppercase; color:var(--muted); padding:.75rem 1rem; text-align:left; border-bottom:1px solid var(--border); background:var(--bg); }
.comparison th,.comparison td { padding:.7rem 1rem; font-size:.875rem; text-align:left; border-bottom:1px solid var(--border); }
.comparison thead tr { background:var(--bg); }
.comparison th { font-size:.75rem; font-weight:600; color:var(--ink); text-transform:uppercase; letter-spacing:.05em; }
.comparison td { color:var(--body-text); }
.comparison td:last-child { color:var(--ink); font-weight:500; }
.comparison tbody tr:last-child td { border-bottom:none; }

.services { background:var(--bg); padding:5.5rem 1.5rem; }
.services__header { margin-bottom:.875rem; }
.services .section-title { margin-bottom:.875rem; }
.services__intro-note { font-size:.9375rem; color:var(--body-text); max-width:640px; line-height:1.68; margin-bottom:3rem; padding:1.125rem 1.375rem; background:var(--surface); border:1px solid var(--border); border-left:3px solid var(--purple); border-radius:0 var(--radius) var(--radius) 0; }
.services__grid { display:grid; grid-template-columns:1fr 1fr; gap:1.25rem; }
.service-card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg); padding:2rem; transition:box-shadow .2s,transform .2s,border-color .2s; }
.service-card:hover { box-shadow:0 8px 32px rgba(0,0,0,.07); transform:translateY(-2px); border-color:#CBD5E1; }
.service-card__icon { width:48px; height:48px; border-radius:10px; display:flex; align-items:center; justify-content:center; font-size:1.375rem; margin-bottom:1.25rem; }
.service-card__icon--teal { background:var(--teal-light); } .service-card__icon--purple { background:var(--purple-light); }
.service-card__tag { display:inline-block; font-family:'JetBrains Mono',monospace; font-size:.68rem; font-weight:500; letter-spacing:.1em; text-transform:uppercase; padding:.25rem .625rem; border-radius:4px; margin-bottom:.875rem; }
.service-card__tag--teal { background:var(--teal-light); color:var(--teal-mid); } .service-card__tag--purple { background:var(--purple-light); color:var(--purple-dark); }
.service-card h3 { font-family:'DM Serif Display',serif; font-size:1.5rem; color:var(--ink); margin-bottom:.75rem; letter-spacing:-.01em; }
.service-card__desc { font-size:.9375rem; color:var(--body-text); line-height:1.68; margin-bottom:1.375rem; }
.service-card__list { list-style:none; display:flex; flex-direction:column; gap:.5rem; }
.service-card__list li { display:flex; align-items:flex-start; gap:.5rem; font-size:.875rem; color:var(--body-text); }
.service-card__list li::before { content:'→'; color:var(--teal); flex-shrink:0; line-height:1.5; }

.about { background:var(--surface); padding:5.5rem 1.5rem; }
.about__grid { display:grid; grid-template-columns:1fr 1.35fr; gap:4.5rem; align-items:center; }
.about .section-title { margin-bottom:1.5rem; }
.expertise-tags { display:flex; flex-wrap:wrap; gap:.5rem; }
.tag { font-size:.8125rem; font-weight:500; padding:.3rem .75rem; border-radius:100px; }
.tag--teal { background:var(--teal-light); color:var(--teal-mid); } .tag--purple { background:var(--purple-light); color:var(--purple-dark); } .tag--gray { background:var(--bg); color:var(--body-text); border:1px solid var(--border); }
.about__text p { font-size:1.0625rem; color:var(--body-text); line-height:1.75; }
.about__text p + p { margin-top:1rem; }

.faq { background:var(--bg); padding:5.5rem 1.5rem; }
.faq__header { margin-bottom:3rem; }
.faq__grid { display:grid; grid-template-columns:1fr 1fr; gap:1.125rem; }
.faq-item { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:1.5rem; transition:border-color .2s; }
.faq-item:hover { border-color:#CBD5E1; }
.faq-item h3 { font-family:'DM Serif Display',serif; font-size:1.0625rem; color:var(--ink); margin-bottom:.625rem; line-height:1.3; }
.faq-item p { font-size:.9rem; color:var(--body-text); line-height:1.65; }

.cta { background:linear-gradient(130deg,var(--purple) 0%,var(--teal) 100%); padding:5.5rem 1.5rem; text-align:center; }
.cta__brackets { font-family:'Sora',sans-serif; font-weight:700; font-size:clamp(2rem,4vw,3rem); color:rgba(255,255,255,.55); line-height:1; margin-bottom:.75rem; letter-spacing:.4em; }
.cta h2 { font-family:'DM Serif Display',serif; font-size:clamp(1.875rem,3.5vw,2.875rem); color:#fff; max-width:660px; margin:0 auto 1rem; letter-spacing:-.02em; line-height:1.18; }
.cta p { font-size:1.0625rem; color:rgba(255,255,255,.82); max-width:560px; margin:0 auto 2.25rem; line-height:1.68; }

.footer { background:var(--ink); padding:2.25rem 1.5rem; }
.footer__inner { max-width:1100px; margin:0 auto; display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:1rem; }
.footer .logo { font-size:1.0625rem; }
.footer__nav { display:flex; align-items:center; flex-wrap:wrap; gap:.25rem 1rem; }
.footer__nav a { font-size:.875rem; color:#64748B; text-decoration:none; transition:color .15s; }
.footer__nav a:hover { color:#fff; }
.footer__copy { font-size:.8125rem; color:#64748B; }

/* ══ Research hub (home) ══ */
.research { background:var(--ink); padding:5.5rem 1.5rem; }
.research .section-label { color:var(--teal-bright); }
.research .section-label::before,.research .section-label::after { color:var(--purple-soft); }
.research .section-title { color:#fff; margin-bottom:.875rem; }
.research__intro { font-size:1.0625rem; color:#94A3B8; max-width:680px; line-height:1.72; margin-bottom:2.75rem; }
.research__intro a { color:var(--teal-bright); text-decoration:none; }
.research__intro a:hover { text-decoration:underline; }
.chapter-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:1rem; }
.chapter-card { display:block; background:rgba(255,255,255,.05); border:1px solid rgba(255,255,255,.12); border-radius:var(--radius); padding:1.375rem 1.375rem 1.25rem; text-decoration:none; transition:background .2s,border-color .2s,transform .2s; }
.chapter-card:hover { background:rgba(255,255,255,.09); border-color:rgba(34,211,238,.4); transform:translateY(-2px); }
.chapter-card__num { font-family:'JetBrains Mono',monospace; font-size:.7rem; font-weight:500; color:var(--teal-bright); letter-spacing:.1em; margin-bottom:.5rem; display:block; }
.chapter-card__title { font-family:'DM Serif Display',serif; font-size:1.125rem; color:#fff; line-height:1.3; margin-bottom:.45rem; }
.chapter-card__desc { font-size:.8125rem; color:#94A3B8; line-height:1.55; }

/* ══ Article pages ══ */
.article-hero { background:var(--ink); padding:3.5rem 1.5rem 3rem; }
.article-hero .container { max-width:820px; }
.breadcrumb { font-family:'JetBrains Mono',monospace; font-size:.72rem; color:#64748B; margin-bottom:1.5rem; }
.breadcrumb a { color:var(--teal-bright); text-decoration:none; }
.breadcrumb a:hover { text-decoration:underline; }
.article-hero__num { font-family:'JetBrains Mono',monospace; font-size:.75rem; font-weight:500; color:var(--teal-bright); letter-spacing:.14em; text-transform:uppercase; display:block; margin-bottom:.75rem; }
.article-hero h1 { font-family:'DM Serif Display',serif; font-size:clamp(1.875rem,4vw,2.75rem); color:#fff; line-height:1.15; letter-spacing:-.02em; margin-bottom:1rem; }
.article-hero__standfirst { font-size:1.0625rem; color:#94A3B8; line-height:1.7; }

.article { background:var(--surface); padding:3.5rem 1.5rem 4rem; }
.article .container { max-width:820px; }
.article p { font-size:1.0313rem; color:var(--body-text); line-height:1.8; margin-bottom:1.375rem; }
.article p strong { color:var(--ink); }
.article h2 { font-family:'DM Serif Display',serif; font-size:1.75rem; color:var(--ink); letter-spacing:-.015em; line-height:1.25; margin:2.75rem 0 1.125rem; }
.article h3 { font-family:'Inter',sans-serif; font-weight:600; font-size:1.125rem; color:var(--purple-dark); margin:2.25rem 0 .875rem; }
.article ul,.article ol { margin:0 0 1.375rem 1.375rem; }
.article li { font-size:1.0313rem; color:var(--body-text); line-height:1.75; margin-bottom:.75rem; }
.article li::marker { color:var(--teal); }
.article li strong { color:var(--ink); }
.article sup { line-height:0; }
.article sup a { font-size:.72em; color:var(--purple); text-decoration:none; font-weight:600; }
.article sup a:hover { text-decoration:underline; }
.article a { color:var(--teal-mid); }

.figure { margin:2.25rem 0; border:1px solid var(--border); border-radius:var(--radius); overflow:hidden; background:var(--bg); }
.figure__label { font-family:'JetBrains Mono',monospace; font-size:.68rem; font-weight:500; letter-spacing:.12em; text-transform:uppercase; color:var(--purple); padding:.75rem 1.125rem .1rem; }
.figure__title { font-weight:600; font-size:.975rem; color:var(--ink); padding:0 1.125rem .75rem; }
.figure img { display:block; width:100%; height:auto; background:#fff; }
.figure figcaption { font-size:.78rem; color:var(--muted); line-height:1.55; padding:.75rem 1.125rem .875rem; border-top:1px solid var(--border); }

.pullbox { border:1px solid var(--border); border-top:3px solid var(--purple); border-radius:0 0 var(--radius) var(--radius); background:var(--bg); padding:1.375rem 1.5rem 1.125rem; margin:2.25rem 0; }
.pullbox h4 { font-weight:600; font-size:1rem; color:var(--purple-dark); margin-bottom:.625rem; }
.pullbox p { font-size:.95rem; margin-bottom:.75rem; }
.pullbox p:last-child { margin-bottom:0; }

.statbar { display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--border); border:1px solid var(--border); border-radius:var(--radius); overflow:hidden; margin:2.25rem 0; }
.statbar__cell { background:var(--ink); padding:1.375rem 1.25rem; }
.statbar__value { font-family:'DM Serif Display',serif; font-size:2rem; line-height:1; margin-bottom:.5rem; }
.statbar__value--teal { color:var(--teal-bright); } .statbar__value--purple { color:var(--purple-soft); }
.statbar__label { font-size:.8rem; color:#94A3B8; line-height:1.45; }

.own-table-wrap { overflow-x:auto; border:1px solid var(--border); border-radius:var(--radius); margin:2.25rem 0; }
.own-table { width:100%; min-width:720px; border-collapse:collapse; font-size:.84rem; }
.own-table th { background:var(--ink); color:#fff; font-weight:600; text-align:left; padding:.7rem .875rem; font-size:.76rem; }
.own-table td { padding:.7rem .875rem; color:var(--body-text); border-bottom:1px solid var(--border); vertical-align:top; line-height:1.55; }
.own-table td:first-child { font-weight:600; color:var(--ink); }
.own-table tbody tr:nth-child(even) { background:var(--bg); }
.own-table tbody tr:last-child td { border-bottom:none; }

.references { background:var(--bg); border-top:1px solid var(--border); padding:3rem 1.5rem 3.5rem; }
.references .container { max-width:820px; }
.references h2 { font-family:'DM Serif Display',serif; font-size:1.5rem; color:var(--ink); margin-bottom:1.5rem; }
.references ol { list-style:none; counter-reset:none; }
.references li { display:flex; gap:.875rem; font-size:.875rem; color:var(--body-text); line-height:1.6; margin-bottom:.875rem; }
.references li .refnum { font-family:'JetBrains Mono',monospace; font-size:.75rem; color:var(--purple); font-weight:600; flex-shrink:0; min-width:1.6rem; }
.references a { color:var(--teal-mid); }

.chapter-nav { background:var(--surface); border-top:1px solid var(--border); padding:2rem 1.5rem; }
.chapter-nav .container { max-width:820px; display:flex; justify-content:space-between; gap:1rem; flex-wrap:wrap; }
.chapter-nav a { display:flex; flex-direction:column; gap:.25rem; text-decoration:none; max-width:47%; }
.chapter-nav a span.dir { font-family:'JetBrains Mono',monospace; font-size:.68rem; letter-spacing:.1em; text-transform:uppercase; color:var(--muted); }
.chapter-nav a span.dest { font-family:'DM Serif Display',serif; font-size:1.0625rem; color:var(--ink); line-height:1.3; transition:color .15s; }
.chapter-nav a:hover span.dest { color:var(--purple); }
.chapter-nav a.next { text-align:right; margin-left:auto; }

/* ══ Responsive ══ */
@media (max-width:820px){
  .nav__links a.nav__link { display:none; }
  .problem__grid,.geo-explainer__grid,.about__grid { grid-template-columns:1fr; gap:2.5rem; }
  .services__grid,.faq__grid { grid-template-columns:1fr; }
  .chapter-grid { grid-template-columns:1fr; }
  .statbar { grid-template-columns:1fr; }
  .footer__inner { flex-direction:column; text-align:center; }
  .footer__nav { justify-content:center; }
}
@media (max-width:480px){ .hero { padding:4rem 1.25rem 4rem; } }

/* ══ Callout (article) ══ */
.callout { border-top:3px solid var(--purple); background:var(--bg); border-radius:0 0 var(--radius) var(--radius); padding:1.375rem 1.5rem 1rem; margin:2.25rem 0; }
.callout__title { font-weight:600; color:var(--purple-dark); font-size:1.0313rem; margin-bottom:.625rem; }
.callout p { margin-bottom:.375rem; }