:root{--em:#123F38;--gold:#C6A05A;--iv:#F5F0E6;--ink:#1F2A27;--mut:#55605C;--line:#E6D7B4}
*{box-sizing:border-box}body{margin:0;background:var(--iv);color:var(--ink);font:17px/1.6 'Source Sans 3',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif}
@font-face{font-family:'Source Sans 3';src:url(/SourceSans3.woff2) format('woff2');font-display:swap}@font-face{font-family:'Cormorant Garamond';src:url(/CormorantGaramond.woff2) format('woff2');font-display:swap}
a{color:#0E5E52}header.tb{background:#fff;border-bottom:1px solid var(--line);padding:10px max(16px,calc((100% - 828px)/2))}header.tb a{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--em);font:700 19px/1 'Cormorant Garamond',Georgia,serif;letter-spacing:.04em}
header.tb img{width:38px;height:auto}main{max-width:860px;margin:0 auto;padding:16px}
.crumb{font-size:14px;color:var(--mut)}.crumb a{color:var(--mut)}h1,h2{font-family:'Cormorant Garamond',Georgia,serif;color:var(--em);line-height:1.15}h1{font-size:34px;margin:.3em 0 .2em}h2{font-size:25px;margin:1.3em 0 .4em;border-bottom:1px solid var(--line);padding-bottom:4px}
.kick{font:700 12.5px/1.3 'Source Sans 3',sans-serif;letter-spacing:.12em;text-transform:uppercase;color:#7A5A22}
.tag{display:inline-block;font:700 12px/1 sans-serif;padding:5px 9px;border-radius:999px;background:var(--em);color:#fff;margin:0 4px 4px 0}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;margin:12px 0}
.cta{background:var(--em);color:#F5F0E6;border-radius:16px;padding:16px;margin:18px 0}.cta a.btn{display:inline-block;background:var(--gold);color:#123F38;font-weight:700;text-decoration:none;border-radius:999px;padding:11px 18px;margin:8px 8px 0 0}.cta a.alt{background:transparent;color:#F5F0E6;border:1.5px solid #C6A05A}
ul.ls{padding-left:1.2em}ul.ls li{margin:.25em 0}.q{border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:10px 0;background:#fff}.q ol{list-style:upper-alpha;padding-left:1.6em;margin:.4em 0}
details summary{cursor:pointer;font-weight:700;color:var(--em)}.why{color:var(--mut)}dl.gl dt{font-weight:700}dl.gl dd{margin:0 0 .5em}
.lessons a{display:block;padding:10px 0;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}.lessons a b{color:var(--em)}.lessons small{color:var(--mut)}
.pn{display:flex;justify-content:space-between;gap:10px;margin:20px 0}.pn a{max-width:48%}footer{font-size:13px;color:var(--mut);text-align:center;padding:24px 16px}
.unit .def{background:#F1F4F9;border-left:4px solid #123F38;padding:10px 12px;border-radius:10px;margin:12px 0}.unit .we{background:#F8FAFC;border:1.5px solid #CBD5E1;border-radius:12px;padding:10px 12px;margin:12px 0}.unit .we>b:first-child{color:#0F766E}
.unit .ans{background:#DCFCE7;border-radius:8px;padding:4px 8px;display:inline-block;font-weight:700}.unit .mis{background:#FEF2F2;border-left:5px solid #DC2626;padding:10px 12px;border-radius:10px;margin:12px 0}.unit .etip,.unit .tip{background:#FFFBEB;border-left:5px solid #D97706;padding:10px 12px;border-radius:10px;margin:12px 0}
.unit table{border-collapse:collapse;width:100%;font-size:.9em;margin:10px 0;display:block;overflow-x:auto}.unit td,.unit th{border:1px solid #CBD5E1;padding:6px}.unit th{background:#F1F5F9}.unit .fig{text-align:center;margin:12px 0}.unit svg{max-width:100%;height:auto}.unit .cap{font-size:.8em;color:#55605C}
.unit .try{background:#ECFEFF;border:1.5px solid #06B6D4;border-radius:12px;padding:10px 12px;margin:12px 0}.unit .ex{margin:8px 0;padding:8px 10px;background:#fff;border:1px solid #E2E8F0;border-radius:10px}
@media (prefers-color-scheme:dark){body{background:#0B2421;color:#EDE7DA}header.tb,.card,.q{background:#123F38;border-color:#24504A}header.tb a,h1,h2,details summary{color:#F1EBDD}a{color:#E4C882}.crumb,.crumb a,.why,.lessons small,footer{color:#C9C1B0}.kick{color:#E4C882}.lessons a{color:#EDE7DA}.lessons a b{color:#F1EBDD}.unit{background:#F5F0E6;color:#1F2A27;border-radius:14px;padding:6px 12px}.unit a{color:#0E5E52}}