:root{--teal:#0d9488;--teal-d:#0f766e;--mint:#5eead4;--teal-l:#f0fdfa;--ink:#0f172a;--gray:#475569;--mut:#64748b;--line:#e2e8f0;}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{font-family:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;color:var(--ink);line-height:1.65;background:#fff;font-size:16px;}
a{color:var(--teal-d);}
.container{max-width:1080px;margin:0 auto;padding:0 24px;}
/* NAV */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);}
.nav .container{display:flex;justify-content:space-between;align-items:center;height:64px;}
.logo{display:flex;align-items:center;text-decoration:none;}
.logo img{height:42px;display:block;}
.nav nav{display:flex;align-items:center;gap:20px;}
.nav nav a{color:var(--gray);text-decoration:none;font-size:15px;font-weight:500;}
.nav nav a:hover{color:var(--teal-d);}
.nav nav a.navcta{background:var(--teal);color:#fff;padding:8px 16px;border-radius:9px;font-weight:700;}
/* read progress */
.read-progress{position:sticky;top:64px;z-index:49;height:3px;background:transparent;}
.read-progress-fill{height:100%;width:0;background:var(--teal);transition:width .08s linear;}
/* breadcrumb */
.breadcrumb{font-size:13px;color:var(--mut);padding:14px 0 0;}
.breadcrumb a{color:var(--mut);text-decoration:none;}.breadcrumb a:hover{color:var(--teal-d);}
.breadcrumb .bc-sep{color:#cbd5e1;margin:0 7px;}.breadcrumb .bc-curr{color:var(--teal-d);font-weight:600;}
/* HERO BAND (hub) */
.hero-band{background:linear-gradient(180deg,var(--teal-l),#fff);border-bottom:1px solid var(--line);}
.hero-band .container{padding:18px 24px 34px;}
.eyebrow{display:inline-block;color:var(--teal);font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:12.5px;}
h1{font-size:38px;line-height:1.14;margin:10px 0 12px;letter-spacing:-.02em;}
.sub{color:var(--gray);font-size:18px;max-width:60ch;}
/* ARTICLE layout */
.a-body{display:flex;gap:40px;padding:18px 0 60px;align-items:flex-start;}
.a-sidebar{width:230px;flex-shrink:0;position:sticky;top:88px;}
.a-content{flex:1;min-width:0;}
.a-content .eyebrow{margin-top:6px;}
.a-content h1{font-size:30px;}
.a-content .sub{font-size:18px;margin-bottom:8px;}
h2{font-size:22px;color:var(--ink);margin:30px 0 10px;letter-spacing:-.01em;}
.a-content h2{scroll-margin-top:88px;}
h3{font-size:17px;margin:18px 0 4px;}
p{margin:0 0 14px;} ul,ol{margin:0 0 16px;padding-left:22px;} li{margin:6px 0;}
.a-content{font-size:16.5px;color:#334155;}
.a-content b{color:var(--ink);}
/* TOC */
.toc-title{font-size:13px;font-weight:700;color:var(--ink);text-transform:uppercase;letter-spacing:.05em;padding-bottom:8px;border-bottom:2px solid var(--teal);margin-bottom:6px;}
a.toc-item{display:block;font-size:14px;color:var(--mut);text-decoration:none;padding:7px 0;border-bottom:1px solid #f1f5f9;line-height:1.35;}
a.toc-item:hover{color:var(--teal-d);}
.sidebar-cta{background:var(--teal-l);border:1px solid var(--mint);border-radius:12px;padding:14px;margin-top:18px;}
.sc-label{font-size:12px;font-weight:700;color:var(--teal-d);text-transform:uppercase;letter-spacing:.04em;margin-bottom:5px;}
.sc-title{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:10px;line-height:1.3;}
.sc-btn{display:inline-block;background:var(--teal);color:#fff;text-decoration:none;font-weight:700;font-size:14px;padding:8px 14px;border-radius:8px;}
.related{margin-top:16px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;}
.related .rt{font-size:13px;font-weight:700;color:var(--ink);margin-bottom:8px;}
.related a{display:block;font-size:14px;color:var(--teal-d);text-decoration:none;padding:3px 0;}
.related a:hover{text-decoration:underline;}
/* COLORED BOXES — story=green / verify=amber / tip=teal */
.story{background:#f0fdf4;border-left:4px solid #22c55e;border-radius:0 10px 10px 0;padding:13px 16px;margin:16px 0;font-size:15.5px;color:#166534;}
.story b{color:#15803d;}
.story .label{display:block;color:#15803d;font-weight:700;font-size:12px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:5px;}
.verify{background:#fffbeb;border-left:4px solid #f59e0b;border-radius:0 10px 10px 0;padding:12px 16px;margin:14px 0;font-size:15px;color:#78350f;}
.verify b{color:#92400e;}
.tip{background:var(--teal-l);border-left:4px solid var(--teal);border-radius:0 10px 10px 0;padding:12px 16px;margin:14px 0;font-size:15.5px;color:#0f766e;}
.tip b{color:var(--teal-d);}
.disclaimer{background:#fffbeb;border:1px solid #fcd34d;border-radius:12px;padding:13px 17px;margin:18px 0;font-size:15px;color:#78350f;}
/* HUB topic grid + chart */
.hub-body{display:flex;gap:32px;padding:22px 0 10px;align-items:flex-start;}
.topic-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;flex:1;}
a.topic-card{display:block;text-decoration:none;color:inherit;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px;transition:.16s;}
a.topic-card:hover{border-color:var(--teal);box-shadow:0 12px 30px rgba(15,23,42,.07);transform:translateY(-2px);}
.tc-icon{width:42px;height:42px;border-radius:11px;background:var(--teal-l);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:11px;}
a.topic-card h3{font-size:16.5px;font-weight:700;color:var(--ink);margin:0 0 5px;}
a.topic-card p{font-size:14px;color:var(--mut);margin:0;line-height:1.5;}
a.topic-card .tc-arr{display:inline-block;margin-top:9px;font-size:14px;font-weight:700;color:var(--teal);}
/* chart sidebar */
.chart-card{width:250px;flex-shrink:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;}
.chart-title{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:3px;}
.chart-sub{font-size:12.5px;color:var(--mut);margin-bottom:14px;line-height:1.4;}
.bar-chart{display:flex;align-items:flex-end;gap:10px;height:130px;border-bottom:1px solid var(--line);padding-bottom:2px;}
.bar-wrap{display:flex;flex-direction:column;align-items:center;gap:5px;flex:1;justify-content:flex-end;}
.bar{width:100%;background:var(--teal);border-radius:4px 4px 0 0;}
.bar.dark{background:var(--teal-d);}
.bar-label{font-size:11px;color:var(--mut);}
.chart-note{font-size:11px;color:var(--mut);margin-top:8px;line-height:1.4;}
.chart-badge{display:flex;align-items:baseline;gap:7px;background:var(--teal-l);border:1px solid var(--mint);border-radius:10px;padding:9px 12px;margin-top:12px;}
.chart-badge .v{font-size:22px;font-weight:800;color:var(--teal-d);line-height:1;}
.chart-badge .l{font-size:12px;color:var(--teal-d);line-height:1.3;}
/* hub extra sections */
.hub-extra{padding:6px 0 0;}
.hub-extra h2{margin-top:34px;}
/* CTA box (in-content / hub) */
.cta{background:linear-gradient(135deg,var(--teal),var(--teal-d));color:#fff;border-radius:20px;padding:32px 28px;margin:40px 0 0;text-align:center;}
.cta h2{color:#fff;margin:0 0 8px;}.cta p{color:#d1fae5;max-width:54ch;margin:0 auto 14px;}
.cta a.btn{display:inline-block;background:#fff;color:var(--teal-d);font-weight:800;text-decoration:none;padding:12px 22px;border-radius:11px;}
/* next-topic band */
.next-band{display:flex;justify-content:space-between;align-items:center;gap:16px;background:var(--teal-l);border:1px solid var(--line);border-radius:14px;padding:16px 20px;margin:8px 0 0;}
.nb-label{font-size:13px;color:var(--gray);margin-bottom:3px;}
.nb-link{font-size:16px;font-weight:700;color:var(--teal-d);text-decoration:none;}
.nb-btn{flex-shrink:0;background:var(--teal);color:#fff;text-decoration:none;font-weight:700;font-size:14px;padding:9px 16px;border-radius:9px;}
/* FOOTER */
.site-footer{background:var(--ink);color:#94a3b8;margin-top:50px;}
.site-footer .container{padding:30px 24px;}
.site-footer .ft-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px;margin-bottom:18px;}
.site-footer .ft-logo{display:inline-block;background:#fff;padding:9px 13px;border-radius:11px;}
.site-footer .ft-logo img{height:34px;display:block;}
.site-footer .ft-tag{font-size:13px;color:#64748b;margin-top:8px;}
.site-footer .ft-col-t{font-size:13px;font-weight:700;color:#e2e8f0;margin-bottom:7px;}
.site-footer a{display:block;color:#94a3b8;text-decoration:none;font-size:13.5px;padding:2px 0;}
.site-footer a:hover{color:var(--mint);}
.site-footer .ft-bottom{border-top:1px solid #1e293b;padding-top:14px;font-size:12.5px;color:#64748b;}
@media(max-width:820px){
  h1{font-size:30px;} .a-content h1{font-size:26px;}
  .a-body,.hub-body{flex-direction:column;gap:22px;}
  .a-sidebar{width:100%;position:static;order:2;}
  .a-content{order:1;}
  .topic-grid{grid-template-columns:1fr;}
  .chart-card{width:100%;}
  .nav nav a:not(.navcta){display:none;}
}