:root{
  --bg:#f6f4ef; --card:#ffffff; --ink:#1d2433; --muted:#5d6676; --line:#e2ddd2;
  --brand:#14532d; --brand-2:#1f7a45; --accent:#b45309; --ok:#e8f5ec; --okb:#1f7a45;
  --bad:#fdecec; --badb:#b42318; --warn:#fff6e0; --slide:#ffffff;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#12161d; --card:#1b212b; --ink:#e8ebf0; --muted:#a3abb8; --line:#2c3441;
    --brand:#5fc98a; --brand-2:#7fd9a2; --accent:#f0a24a; --ok:#163024; --okb:#5fc98a;
    --bad:#3a1d1d; --badb:#f08a8a; --warn:#3a2f17; --slide:#171c24; }
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:"Sarabun","Noto Sans Thai",system-ui,sans-serif;font-size:17px;line-height:1.6}
a{color:var(--brand-2)}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
header.top{border-bottom:1px solid var(--line);background:var(--card)}
header.top .wrap{display:flex;gap:16px;align-items:center;justify-content:space-between;min-height:56px;flex-wrap:wrap}
header.top a.logo{font-weight:700;color:var(--ink);text-decoration:none}
nav a{margin-left:14px;text-decoration:none;color:var(--muted);font-weight:600}
nav a.on{color:var(--brand-2)}
h1{font-size:clamp(26px,4vw,40px);line-height:1.25;margin:28px 0 8px}
h2{font-size:24px;margin:28px 0 12px}
.sub{color:var(--muted);margin:0 0 18px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.card h3{margin:4px 0 6px;font-size:19px}
.card .tag{font-size:13px;color:var(--accent);font-weight:700;letter-spacing:.3px}
a.card{text-decoration:none;color:inherit;display:block}
a.card:hover{border-color:var(--brand-2)}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:8px;padding:9px 16px;font:inherit;font-weight:600;text-decoration:none;cursor:pointer}
@media (prefers-color-scheme: dark){.btn{color:#0d1a12}}
.btn.ghost{background:transparent;color:var(--brand-2);border:1px solid var(--line)}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:12px 0}
table.t{border-collapse:collapse;width:100%;font-size:.95em}
table.t th,table.t td{border:1px solid var(--line);padding:6px 10px;text-align:left;vertical-align:top}
table.t th{background:color-mix(in srgb,var(--brand) 12%,transparent)}
table.num td+td{text-align:right;font-variant-numeric:tabular-nums}
tr.tot td{font-weight:700;border-top:2px solid var(--ink)}
.scroll{overflow-x:auto}
ul.plain{padding-left:20px}
.sess{display:grid;grid-template-columns:120px 1fr;gap:4px 14px;margin:0}
.sess dt{font-weight:700;color:var(--accent);font-variant-numeric:tabular-nums}
.sess dd{margin:0 0 10px}
.sess dd ul{margin:2px 0;padding-left:18px;color:var(--muted)}
.slides-list{counter-reset:s;padding-left:0;list-style:none}
.slides-list li{border-bottom:1px solid var(--line)}
.slides-list a{display:block;padding:8px 4px;text-decoration:none;color:var(--ink)}
.slides-list a::before{counter-increment:s;content:counter(s) ".";color:var(--muted);display:inline-block;width:34px}
footer{color:var(--muted);font-size:14px;padding:30px 0}

/* ---- present mode ---- */
body.present{overflow:hidden}
.stage{position:fixed;inset:0;background:var(--bg);display:flex;flex-direction:column}
.stage .bar{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;color:var(--muted);font-size:14px;gap:10px}
.stage .bar .tools{display:flex;gap:6px;flex-wrap:wrap}
.stage .bar button{background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:4px 10px;font:inherit;font-size:14px;cursor:pointer}
.slide{flex:1;margin:0 auto 10px;width:min(1200px,calc(100% - 32px));background:var(--slide);border:1px solid var(--line);border-radius:14px;padding:clamp(18px,3.5vw,48px);overflow:auto;font-size:clamp(17px,2.1vw,27px)}
.slide h2{margin:0 0 .6em;font-size:1.5em;color:var(--brand-2);line-height:1.25}
.slide ul,.slide ol{padding-left:1.2em;margin:.3em 0}
.slide li{margin:.25em 0}
.slide table.t{font-size:.8em}
.progress{height:4px;background:var(--line)}
.progress i{display:block;height:100%;background:var(--brand-2)}
.notes{background:var(--warn);border-top:1px solid var(--line);padding:10px 16px;font-size:15px;max-height:22vh;overflow:auto}
.big{font-size:1.2em;font-weight:600}
.center{text-align:center}
.note{color:var(--muted);font-size:.8em}
.warn{background:var(--warn);border-left:4px solid var(--accent);padding:.4em .8em;border-radius:6px}
.box{background:color-mix(in srgb,var(--brand) 7%,transparent);border:1px solid var(--line);border-radius:10px;padding:.6em 1em;margin:.4em 0}
.box h4{margin:.1em 0 .3em}
.box.ok{background:var(--ok)} .box.bad{background:var(--bad)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:1em}
@media (max-width:720px){.two{grid-template-columns:1fr}}
.cols{columns:2;column-gap:2em} @media (max-width:720px){.cols{columns:1}}
ul.check,ul.cross{list-style:none;padding-left:0}
ul.check li::before{content:"✓ ";color:var(--okb);font-weight:700}
ul.cross li::before{content:"✗ ";color:var(--badb);font-weight:700}
.flow{display:flex;flex-wrap:wrap;gap:.4em;margin:.4em 0 1em}
.flow span{background:var(--brand);color:#fff;border-radius:6px;padding:.2em .6em;font-size:.85em}
@media (prefers-color-scheme: dark){.flow span{color:#0d1a12}}
.flow span:not(:last-child)::after{content:" →"}
details.ans{border:1px dashed var(--accent);border-radius:10px;padding:.4em .8em}
details.ans summary{cursor:pointer;color:var(--accent);font-weight:700}
.qr{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:9}
.qr .in{background:#fff;color:#111;padding:24px;border-radius:14px;text-align:center;max-width:92vw}
.qr .in #qrbox{display:inline-block;margin:10px}
.qr .in code{word-break:break-all;font-size:14px}

/* ---- quiz & tools ---- */
.q{margin:18px 0}
.q .choices button{display:block;width:100%;text-align:left;margin:6px 0;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:10px 12px;font:inherit;cursor:pointer}
.q .choices button.right{background:var(--ok);border-color:var(--okb)}
.q .choices button.wrong{background:var(--bad);border-color:var(--badb)}
.q .exp{color:var(--muted);margin-top:4px}
.score{font-size:22px;font-weight:700}
label{display:block;margin:10px 0 4px;font-weight:600}
input,select{font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);width:100%;max-width:340px}
.res{margin-top:14px}
.form2{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:0 16px}
@media print{header.top,footer,.row{display:none}}

/* prompt boxes */
pre.prompt{white-space:pre-wrap;background:color-mix(in srgb,var(--accent) 9%,transparent);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:8px;padding:.6em .9em;font-family:inherit;font-size:.78em;line-height:1.55;position:relative;margin:.4em 0}
pre.prompt .cp{position:absolute;top:6px;right:6px;font:inherit;font-size:13px;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:2px 8px;cursor:pointer}