:root{
  --primary:#114742;--primary-dark:#0c332f;--primary-soft:#edffe3;
  --bg:#f6f5f1;--card:#fff;--ink:#141414;--muted:#5f5f5f;--border:#e6e4dd;
  --accent:#2a7d5f;--paper:#fbfaf6;--danger:#c94b4b;--warn:#c98a2a;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Hedvig Letters Serif',Georgia,serif;font-weight:500;letter-spacing:-.015em;line-height:1.18}
code,.mono{font-family:'JetBrains Mono',ui-monospace,monospace}
a{color:var(--primary)}
a:hover{color:var(--primary-dark)}

.wrap{display:grid;grid-template-columns:280px 1fr;max-width:1480px;margin:0 auto;min-height:100vh}

/* sidebar */
.side{position:sticky;top:0;height:100vh;overflow-y:auto;background:var(--primary);color:#dfeee6;padding:28px 22px}
.side .brand{display:flex;align-items:center;gap:12px;margin-bottom:24px;text-decoration:none}
.logo{width:42px;height:42px;background:var(--primary-soft);border-radius:11px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.logo svg{width:22px;height:22px;fill:var(--primary)}
.brand h1{font-size:18px;color:#fff;font-family:'Hedvig Letters Serif',serif}
.brand p{font-size:10px;color:#9fc4b6;text-transform:uppercase;letter-spacing:.13em;margin-top:2px}
.nav-grp{font-size:10px;text-transform:uppercase;letter-spacing:.15em;color:#7ba696;margin:18px 0 6px;padding-left:11px}
.side a.nav{display:flex;align-items:center;gap:10px;color:#cfe3da;font-size:13px;padding:8px 11px;border-radius:7px;transition:.15s;text-decoration:none;margin-bottom:2px}
.side a.nav:hover{background:rgba(255,255,255,.07);color:#fff}
.side a.nav.on{background:var(--primary-soft);color:var(--primary);font-weight:600}
.side a.nav .num{font-family:'JetBrains Mono';font-size:10px;opacity:.7;min-width:24px}
.side a.nav.on .num{color:var(--primary);opacity:1}
.side-footer{margin-top:32px;padding:14px;background:rgba(0,0,0,.18);border-radius:9px;font-size:11.5px;color:#9fc4b6;line-height:1.55}
.side-footer a{color:var(--primary-soft);text-decoration:underline}

/* main */
main{padding:0 0 140px;background:var(--bg)}

.hero{padding:72px 70px 50px;background:radial-gradient(900px 380px at 80% -10%,rgba(17,71,66,.08),transparent 60%),var(--paper);border-bottom:1px solid var(--border)}
.kx{font-size:12px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--primary);margin-bottom:16px}
.hero h1{font-size:54px;line-height:1.05;max-width:18ch}
.hero h1 em{font-style:italic;color:var(--primary)}
.hero p.lead{font-size:18px;color:var(--muted);max-width:64ch;margin-top:20px}

.crumbs{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);margin-bottom:18px;font-family:'JetBrains Mono'}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--primary)}
.crumbs .sep{opacity:.4}

section{padding:54px 70px;border-bottom:1px solid var(--border)}
section:nth-of-type(even){background:var(--paper)}
.lbl{font-size:11px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--primary);margin-bottom:11px;display:flex;align-items:center;gap:10px}
.lbl::before{content:"";width:26px;height:2px;background:var(--primary)}
section>h2{font-size:32px;max-width:26ch;margin-bottom:11px}
section>p.sub{font-size:15.5px;color:var(--muted);max-width:74ch;margin-bottom:28px}

/* callouts */
.plain{background:var(--primary-soft);border-radius:12px;padding:15px 19px;font-size:14.5px;color:var(--primary-dark);max-width:80ch;margin-bottom:24px;line-height:1.6}
.plain b{font-weight:700}
.plain strong{font-weight:700}
.update-2026{background:#fff;border:1px solid var(--border);border-left:4px solid var(--warn);border-radius:10px;padding:14px 18px;font-size:13.5px;color:var(--ink);margin:18px 0;max-width:82ch;line-height:1.6}
.update-2026 .tag-up{display:inline-block;font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--warn);margin-right:8px}
.example{background:#fff;border:1px solid var(--border);border-radius:11px;padding:16px 19px;font-size:13.5px;margin:14px 0;max-width:82ch;line-height:1.6}
.example .tag-ex{display:inline-block;font-size:10px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--primary);background:var(--primary-soft);padding:3px 8px;border-radius:5px;margin-bottom:9px}
.danger{background:#fff;border:1px solid var(--border);border-left:4px solid var(--danger);border-radius:10px;padding:14px 18px;font-size:13.5px;color:var(--ink);margin:18px 0;max-width:82ch;line-height:1.6}
.danger b{color:var(--danger)}

/* grids/cards */
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:1100px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:760px){.wrap{grid-template-columns:1fr}.side{position:relative;height:auto}.hero,section{padding:36px 26px}.g2,.g3,.g4{grid-template-columns:1fr}}

.cardx{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px}
.cardx h3{font-size:17px;margin-bottom:6px}
.cardx h4{font-size:14px;font-family:'Inter';font-weight:700;margin-bottom:4px}
.cardx p{font-size:13px;color:var(--muted);line-height:1.6}
.cardx .tag{display:inline-block;font-size:10px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--primary);background:var(--primary-soft);padding:4px 9px;border-radius:6px;margin-bottom:11px}

/* tables */
table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:13px;overflow:hidden;font-size:13.5px;margin:16px 0}
th,td{padding:11px 16px;text-align:left;border-bottom:1px solid var(--border);vertical-align:top}
th{background:var(--primary);color:#fff;font-size:10.5px;text-transform:uppercase;letter-spacing:.07em;font-weight:600}
tr:last-child td{border-bottom:0}
td.mono{font-family:'JetBrains Mono';color:var(--primary);font-size:12px}
tr:hover td{background:var(--paper)}

/* lists */
ul.bullets{list-style:none;margin:14px 0;max-width:82ch}
ul.bullets li{padding-left:24px;position:relative;margin-bottom:10px;font-size:14.5px;line-height:1.65}
ul.bullets li::before{content:"";position:absolute;left:5px;top:11px;width:6px;height:6px;background:var(--primary);border-radius:50%}

ol.steps-list{counter-reset:s;list-style:none;margin:18px 0;max-width:82ch}
ol.steps-list li{counter-increment:s;padding:14px 18px 14px 56px;position:relative;margin-bottom:8px;background:var(--card);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:9px;font-size:14.5px;line-height:1.6}
ol.steps-list li::before{content:counter(s);position:absolute;left:14px;top:50%;transform:translateY(-50%);width:28px;height:28px;background:var(--primary);color:#fff;font-family:'JetBrains Mono';font-size:12px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:600}

/* tools row */
.tool-row{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 6px}
.tool{display:inline-flex;align-items:center;gap:6px;background:var(--card);border:1px solid var(--border);border-radius:7px;padding:7px 12px;font-size:12.5px;text-decoration:none;color:var(--ink);transition:.15s}
.tool:hover{border-color:var(--primary);color:var(--primary);transform:translateY(-1px)}
.tool .dot{width:6px;height:6px;background:var(--accent);border-radius:50%}

/* code blocks */
pre{background:var(--primary-dark);color:#e7f5ee;padding:18px 20px;border-radius:11px;font-family:'JetBrains Mono';font-size:12.5px;line-height:1.6;overflow-x:auto;margin:14px 0;max-width:82ch}
pre code{color:inherit;background:none;padding:0}
:not(pre)>code{background:var(--paper);border:1px solid var(--border);padding:1px 6px;border-radius:5px;font-size:12.5px;color:var(--primary)}

/* takeaway */
.takeaway{background:var(--primary);color:#eafff0;border-radius:15px;padding:26px;max-width:84ch;margin:22px 0}
.takeaway h3{color:#fff;font-size:20px;margin-bottom:9px;font-family:'Hedvig Letters Serif'}
.takeaway p{font-size:14px;color:#bfe0d2;line-height:1.65}
.takeaway b{color:var(--primary-soft)}

/* nav arrows next/prev */
.nav-bottom{display:flex;justify-content:space-between;gap:16px;padding:54px 70px 0;max-width:1280px;border-top:1px solid var(--border);margin-top:0}
@media(max-width:760px){.nav-bottom{padding:36px 26px 0;flex-direction:column}}
.nav-bottom a{flex:1;background:var(--card);border:1px solid var(--border);border-radius:13px;padding:18px 22px;text-decoration:none;color:var(--ink);transition:.2s;display:block}
.nav-bottom a:hover{border-color:var(--primary);transform:translateY(-2px);box-shadow:0 8px 26px rgba(17,71,66,.08)}
.nav-bottom a .label{font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.nav-bottom a .title{font-size:16px;font-weight:600;color:var(--primary)}
.nav-bottom a.next{text-align:right}

/* checklist */
.check{display:flex;flex-direction:column;gap:10px;max-width:82ch}
.check label{display:flex;align-items:flex-start;gap:13px;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:13px 17px;font-size:14px;line-height:1.6;cursor:pointer;transition:.15s}
.check label:hover{border-color:var(--primary)}
.check input{margin-top:3px;width:17px;height:17px;accent-color:var(--primary);cursor:pointer;flex-shrink:0}
.check input:checked + .ctxt{opacity:.5;text-decoration:line-through}

/* diag quiz */
.quiz{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:30px;max-width:780px;box-shadow:0 18px 52px rgba(17,71,66,.07)}
.quiz h3{font-size:22px;margin-bottom:6px}
.quiz p.qsub{font-size:14px;color:var(--muted);margin-bottom:20px}
.quiz .q{display:none}
.quiz .q.active{display:block}
.quiz .qlabel{font-size:11px;text-transform:uppercase;letter-spacing:.13em;color:var(--primary);font-weight:700;margin-bottom:9px}
.quiz .qtext{font-size:18px;font-family:'Hedvig Letters Serif';margin-bottom:18px;line-height:1.35}
.quiz .opts{display:flex;flex-direction:column;gap:9px}
.quiz .opt{background:var(--paper);border:1.5px solid var(--border);border-radius:10px;padding:14px 18px;text-align:left;font-size:14px;cursor:pointer;font-family:'Inter';transition:.15s;line-height:1.5}
.quiz .opt:hover{border-color:var(--primary);background:var(--primary-soft)}
.quiz .result{display:none}
.quiz .result.active{display:block}
.quiz .result h4{font-size:13px;letter-spacing:.13em;text-transform:uppercase;color:var(--primary);margin-bottom:8px}
.quiz .result h3{margin-bottom:8px}
.quiz .result .verdict{background:var(--primary-soft);border-radius:11px;padding:18px 22px;margin:14px 0;font-size:14.5px;color:var(--primary-dark);line-height:1.6}
.quiz .result .go-btn{display:inline-block;background:var(--primary);color:#fff;padding:13px 22px;border-radius:10px;text-decoration:none;font-weight:600;font-size:14px;margin-top:8px;transition:.2s}
.quiz .result .go-btn:hover{background:var(--primary-dark);transform:translateY(-1px)}
.quiz .restart{background:none;border:0;color:var(--muted);text-decoration:underline;font-size:12.5px;cursor:pointer;margin-top:14px;font-family:'Inter'}

/* module grid (home) */
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;max-width:1140px}
@media(max-width:1100px){.module-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:680px){.module-grid{grid-template-columns:1fr}}
.mcard{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px;text-decoration:none;color:var(--ink);transition:.2s;display:flex;flex-direction:column;gap:9px;position:relative}
.mcard:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 14px 38px rgba(17,71,66,.09)}
.mcard .mnum{font-family:'JetBrains Mono';font-size:11px;color:var(--primary);background:var(--primary-soft);padding:3px 8px;border-radius:5px;align-self:flex-start;font-weight:600}
.mcard h3{font-size:18px;font-family:'Hedvig Letters Serif';color:var(--ink)}
.mcard p{font-size:13px;color:var(--muted);line-height:1.6}
.mcard .mtag{font-size:10px;letter-spacing:.13em;text-transform:uppercase;font-weight:700;color:var(--accent);margin-top:6px}