/* ===== Journal of High School Economics — Modern / bold ===== */
:root{
  --ink:#0f172a;         /* slate-900 */
  --ink-soft:#334155;    /* slate-700 */
  --muted:#64748b;       /* slate-500 */
  --line:#e2e8f0;        /* slate-200 */
  --soft:#f1f5f9;        /* slate-100 */
  --bg:#ffffff;
  --dark:#0b1220;        /* hero bg */
  --accent:#0d9488;      /* teal-600 */
  --accent-dk:#0f766e;   /* teal-700 */
  --accent-lt:#ccfbf1;   /* teal-100 */
  --amber:#0d9488;       /* alias so legacy refs stay on-brand */
  --amber-dk:#0f766e;
  --cream:#ffffff;
  --paper:#ffffff;
  --rule:#e2e8f0;
  --ok:#15803d; --err:#b91c1c;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --serif:var(--sans);   /* no serif in this design */
  --font:var(--sans);
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent-dk);text-decoration:none}
a:hover{color:var(--ink)}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.serif{font-family:var(--sans)}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:800;color:var(--accent-dk)}

/* ---- Masthead ---- */
.masthead{background:rgba(255,255,255,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.masthead-top{display:flex;justify-content:space-between;align-items:center;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);padding:7px 0}
.masthead-top{border-bottom:1px solid var(--soft)}
.masthead-main{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:16px 0}
.brand{line-height:1.05;font-weight:800}
.brand .b1{display:block;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent-dk);font-weight:800;margin-bottom:3px}
.brand .b2{display:block;font-size:22px;color:var(--ink);letter-spacing:-.01em}
nav.main{display:flex;gap:8px;align-items:center;font-size:14px;font-weight:600}
nav.main a{color:var(--ink-soft);padding:8px 12px;border-radius:10px}
nav.main a:hover{background:var(--soft);color:var(--ink)}
nav.main a.cta{background:var(--accent);color:#fff}
nav.main a.cta:hover{background:var(--accent-dk);color:#fff}

/* ---- Buttons ---- */
.btn{display:inline-block;font-weight:700;font-size:15px;border:0;cursor:pointer;border-radius:999px;padding:12px 24px;background:var(--accent);color:#fff;transition:transform .05s,background .15s}
.btn:hover{background:var(--accent-dk);color:#fff}
.btn:active{transform:translateY(1px)}
.btn.outline{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.45)}
.btn.outline:hover{background:rgba(255,255,255,.12);color:#fff}
.btn.amber{background:var(--accent)}
.btn.amber:hover{background:var(--accent-dk)}
.btn.sm{padding:8px 16px;font-size:13px}
.btn.gray{background:var(--soft);color:var(--ink)}
.btn.gray:hover{background:#e2e8f0;color:var(--ink)}

/* ---- Hero (dark) ---- */
.hero{background:radial-gradient(1200px 500px at 80% -10%,rgba(13,148,136,.25),transparent),var(--dark);color:#e5edf5;padding:74px 0 66px;border:0}
.hero .kicker{margin-bottom:16px;color:#5eead4}
.hero h1{font-size:56px;line-height:1.03;margin:0 0 18px;letter-spacing:-.025em;font-weight:800;color:#fff}
.hero h1 .hl{color:#5eead4}
.hero p.lede{font-size:19px;color:#b6c2d4;max-width:640px;margin:0 0 28px}
.hero p.lede strong{color:#fff}

/* ---- Sections ---- */
section{padding:60px 0}
.section-label{display:flex;align-items:center;gap:14px;margin-bottom:30px}
.section-label h2{font-size:30px;margin:0;font-weight:800;letter-spacing:-.02em}
.section-label .rule{flex:1;height:1px;background:var(--line)}
.grid{display:grid;gap:22px}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:26px;box-shadow:var(--shadow)}
.card h3{font-size:19px;margin:0 0 8px;font-weight:700}
.card .num{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:var(--accent-lt);color:var(--accent-dk);font-size:18px;font-weight:800;margin-bottom:14px}
.card p{margin:0;color:var(--ink-soft);font-size:15px}

/* table of contents */
.toc{border-top:1px solid var(--line)}
.toc-entry{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--line);align-items:center}
.toc-entry .pp{color:var(--muted);font-size:13px;min-width:70px;font-variant-numeric:tabular-nums}
.toc-entry .cat{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:#fff;background:var(--accent);border-radius:999px;padding:4px 10px;font-weight:700;min-width:0}
.toc-entry h3{font-size:18px;margin:0;font-weight:700}
.toc-entry .authors{color:var(--muted);font-size:14px}

/* dark feature band */
.band{background:var(--dark);color:#dbe4f0;border-radius:0}
.band h2{color:#fff}
.band .card{background:#111b2e;border-color:#1e2a42;color:#c7d2e0}
.band .card p{color:#9fb0c6}
.band a{color:#5eead4}
blockquote.pull{font-size:26px;line-height:1.4;font-weight:600;border-left:4px solid var(--accent);margin:0;padding:6px 0 6px 22px;color:#fff}

/* ---- Prose pages ---- */
.prose{max-width:760px}
.prose h1{font-size:44px;line-height:1.05;margin:0 0 10px;font-weight:800;letter-spacing:-.025em}
.prose h2{font-size:26px;margin:38px 0 12px;font-weight:800;letter-spacing:-.01em}
.prose h3{font-size:19px;margin:24px 0 6px;font-weight:700}
.prose p,.prose li{color:var(--ink-soft);font-size:16.5px}
.prose ul,.prose ol{padding-left:20px}
.prose .lead{font-size:20px;color:var(--ink)}
.steps{counter-reset:s;list-style:none;padding:0;margin:24px 0}
.steps li{counter-increment:s;position:relative;padding:0 0 22px 56px;border-left:2px solid var(--line);margin-left:18px}
.steps li:last-child{border-left-color:transparent}
.steps li:before{content:counter(s);position:absolute;left:-18px;top:-4px;width:36px;height:36px;background:var(--accent);color:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:800}
.steps li h4{margin:0 0 3px;font-size:18px;font-weight:700}
.steps li p{margin:0}
.callout{background:var(--accent-lt);border:1px solid #99f6e4;border-radius:14px;padding:16px 18px;margin:20px 0;color:#134e4a}
.factbar{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
.factbar div{background:var(--paper);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow)}
.factbar .k{font-size:30px;font-weight:800;color:var(--accent-dk);letter-spacing:-.02em}
.factbar .l{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin-top:2px}

/* ---- Footer ---- */
footer{background:var(--dark);color:#9fb0c6;padding:44px 0;margin-top:40px}
.foot{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:14px}
.foot a{color:#cdd8e6}
.foot .brand .b2{font-size:20px;color:#fff}
.foot .brand .b1{color:#5eead4}

@media(max-width:860px){
  .hero h1{font-size:40px}
  .grid.c3,.grid.c2{grid-template-columns:1fr}
  .factbar{grid-template-columns:1fr}
  nav.main a:not(.cta){display:none}
}