/* One stylesheet for every lesson page. Brand: navy #0B2C3C, teal #0B5263, blue #0A84FF, orange #F75F1A, cream #FBF8F4. */
:root{--navy:#0B2C3C;--teal:#0B5263;--orange:#F75F1A;--cream:#FBF8F4;--blue:#0A84FF;--line:#e3ddd3;--muted:#5b6b75;--good:#1a8f5a;--bad:#c2410c}
*{box-sizing:border-box}
body{margin:0;background:var(--cream);color:#1d2a33;font:17px/1.6 Nunito,system-ui,sans-serif}
a{color:var(--blue)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
header.top{background:var(--navy);color:#fff}
header.top .wrap{display:flex;justify-content:space-between;align-items:center;padding:14px 16px;gap:12px}
.brand{color:#fff;text-decoration:none;font-weight:800;font-size:20px;white-space:nowrap} .brand b{color:var(--orange)}
.brand span{font-weight:600}
.top-links{display:flex;gap:10px;align-items:center}
.top-links a{color:#fff;font-weight:700;text-decoration:none;font-size:14px}
.top-links a.pill{border:1px solid #ffffff55;padding:6px 12px;border-radius:999px}
.crumbs{font-size:14px;color:var(--muted);margin:18px 0 4px} .crumbs a{color:var(--muted)}
h1{font-size:34px;line-height:1.15;color:var(--navy);margin:4px 0 10px}
h2{font-size:25px;color:var(--navy);margin:38px 0 10px}
h3{font-size:18px;color:var(--teal);margin:0 0 6px}
.tags span{display:inline-block;font-size:13px;font-weight:700;padding:4px 10px;border-radius:999px;background:#fff;border:1px solid var(--line);margin:0 6px 6px 0}
.tags .code{background:var(--navy);color:#fff;font-family:"Space Mono",monospace;border-color:var(--navy)}
.mono{font-family:"Space Mono",monospace}
.lead{font-size:19px}
.card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;margin:14px 0}
.hero{display:grid;grid-template-columns:1fr 300px;gap:18px;align-items:center}
.path{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.path ul{margin:0;padding-left:18px} .path .soon{color:var(--muted)}
.big{border-left:6px solid var(--orange)} .big p{margin:6px 0}
svg.fig{width:100%;max-width:300px;height:auto;display:block}
dl.vocab{display:grid;grid-template-columns:max-content 1fr;gap:6px 16px;margin:0}
dl.vocab dt{font-weight:800;color:var(--teal)} dl.vocab dd{margin:0}
table.grid{border-collapse:collapse;width:100%;font-size:16px}
table.grid th,table.grid td{border-bottom:1px solid var(--line);padding:8px 6px;text-align:left;vertical-align:top}
table.grid th{color:var(--teal);font-size:14px;text-transform:uppercase;letter-spacing:.04em}
.ex-grid{display:grid;grid-template-columns:1fr 260px;gap:16px;align-items:start}
.ex-grid.nofig{grid-template-columns:1fr}
.steps li{margin:4px 0}
.mistake{border-left:6px solid var(--bad)} .mistake p{margin:6px 0}
ol.qs{padding-left:22px}
.q{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px 16px;margin:10px 0}
.prompt{font-weight:700}
.qfig svg.fig{max-width:240px;margin-top:6px}
svg.fig.wide{max-width:420px}.qfig svg.fig.wide{max-width:400px}
.wtag{font-size:12px;font-weight:800;color:var(--teal);background:#e7f2f2;border-radius:999px;padding:2px 8px;white-space:nowrap}
.rel{margin:6px 0}
table.xy{border-collapse:collapse;font-family:"Space Mono",monospace;margin:8px 0}
table.xy td,table.xy th{border:1px solid var(--line);padding:3px 12px;text-align:center} table.xy th{background:#f3efe8}
svg.map{width:240px;max-width:100%}
ul.opts{list-style:none;padding:0;margin:6px 0}
.showbtn{font:inherit;font-weight:800;background:var(--orange);color:#fff;border:0;border-radius:999px;padding:10px 18px;cursor:pointer}
ol.ans li{margin:8px 0} ol.ans b{color:var(--good)}
h3.tier{margin:26px 0 4px;color:var(--navy);font-size:19px} h3.tier .tnum{display:inline-block;background:var(--navy);color:#fff;border-radius:999px;padding:1px 10px;font-size:13px;margin-right:6px;vertical-align:2px}
h3.tier .tsub{display:block;font-size:14px;font-weight:600;color:var(--muted)}
.wtag.stretch{color:#9a3412;background:#fdebe2}
.cta{background:var(--navy);color:#fff;border-radius:16px;padding:22px;margin:38px 0}
.cta h2{color:#fff;margin-top:0}
.cta a{display:inline-block;text-decoration:none;font-weight:800;padding:10px 16px;border-radius:999px;margin:4px 8px 0 0}
.cta .primary{background:var(--orange);color:#fff} .cta .secondary{background:#fff;color:var(--navy)}
footer{color:var(--muted);font-size:14px;padding:12px 0 40px}
/* lessons home */
.strand{margin:10px 0 24px} .strand ul{columns:2;column-gap:28px;padding-left:18px} .strand li{break-inside:avoid;margin:3px 0}
/* transversal explorer */
.explore{display:grid;grid-template-columns:320px 1fr;gap:18px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.chips button{font:inherit;font-size:14px;font-weight:700;border:1px solid var(--line);background:#fff;color:var(--navy);border-radius:999px;padding:6px 12px;cursor:pointer}
.chips button[aria-pressed="true"]{background:var(--navy);color:#fff;border-color:var(--navy)}
input[type=range]{width:100%}
.meas{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-top:10px}
.meas div{background:var(--cream);border-radius:8px;padding:6px;text-align:center;font-family:"Space Mono",monospace;font-size:14px}
.meas div.on{background:var(--orange);color:#fff}
#exNote{font-weight:700;color:var(--navy);min-height:3em}
@media (max-width:680px){
  .hero,.path,.explore,.ex-grid{grid-template-columns:1fr} h1{font-size:28px}
  .card{padding:14px 12px} table.grid{font-size:14px} table.grid th,table.grid td{padding:6px 3px} table.grid th{font-size:12px}
  dl.vocab{grid-template-columns:1fr} dl.vocab dd{margin-bottom:8px}
  .strand ul{columns:1} .top-links a:not(.pill){display:none}
}