:root{
  --bg:#f6f5f0; --surface:#ffffff; --ink:#15201c; --muted:#5d6b65; --line:#e3e1d8;
  --accent:#1a6b4f; --accent-soft:#e3f2ea; --warn:#fff4d6; --warn-ink:#7a5600;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0f1513; --surface:#171f1c; --ink:#e8eee9; --muted:#9aaaa2; --line:#26322d;
    --accent:#6fd3a4; --accent-soft:#16302a; --warn:#3a2f12; --warn-ink:#f3d27a;
  }
}
:root[data-theme="dark"]{
  --bg:#0f1513; --surface:#171f1c; --ink:#e8eee9; --muted:#9aaaa2; --line:#26322d;
  --accent:#6fd3a4; --accent-soft:#16302a; --warn:#3a2f12; --warn-ink:#f3d27a;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"IBM Plex Sans Thai",system-ui,sans-serif;line-height:1.6;font-size:16px}
a{color:var(--accent)}
.wrap{max-width:860px;margin:0 auto;padding:0 16px}
.top{display:flex;align-items:center;justify-content:space-between;padding:18px 0}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);text-decoration:none}
.mark{width:30px;height:30px;border-radius:8px;background:#123b2f;color:#b8f2cf;display:grid;place-items:center;font:500 13px "IBM Plex Mono",monospace}
.toplink{font-size:15px}
.intro h1{font-size:clamp(26px,5vw,38px);line-height:1.25;margin:16px 0 10px}
.lead{color:var(--muted);font-size:17px;margin:0 0 10px}
.safe{margin:0 0 20px;font-size:15px;background:var(--accent-soft);color:var(--ink);padding:10px 14px;border-radius:10px}
.warn{background:var(--warn);color:var(--warn-ink);padding:10px 14px;border-radius:10px;font-size:15px}
.drop{display:flex;flex-direction:column;align-items:center;gap:4px;text-align:center;border:2px dashed var(--line);background:var(--surface);border-radius:16px;padding:32px 16px;cursor:pointer;transition:border-color .15s}
.drop:hover,.drop.over{border-color:var(--accent)}
.drop input{position:absolute;width:1px;height:1px;opacity:0}
.drop-big{font-weight:600;font-size:18px}
.drop-small{color:var(--muted);font-size:14px}
.howto{margin:12px 0 20px;font-size:15px;color:var(--muted)}
.howto summary{cursor:pointer;color:var(--accent)}
.howto ol{padding-left:20px}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px;margin:0 0 24px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.grid label{display:flex;flex-direction:column;gap:4px;font-size:14px;color:var(--muted);min-width:0}
.grid .span2{grid-column:1/-1}
.grid .check{flex-direction:row;align-items:center;gap:8px;color:var(--ink);font-size:15px}
input[type=text],input[type=date],textarea{font:inherit;font-size:16px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:9px 12px;width:100%;min-width:0}
textarea{resize:vertical}
.names{margin-top:16px;font-size:15px;border-top:1px solid var(--line);padding-top:14px}
.names p{margin:0 0 8px}
.names summary{cursor:pointer;color:var(--accent)}
.names textarea{margin:6px 0 8px}
.hint{color:var(--muted);font-size:14px}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin-top:18px}
.btn{font:inherit;font-weight:600;font-size:16px;border:0;background:var(--ink);color:var(--bg);padding:11px 22px;border-radius:999px;cursor:pointer}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);font-size:14px;padding:7px 14px}
.foot{padding:28px 0 44px;color:var(--muted);font-size:13.5px}
.foot p{margin:0 0 6px}
@media (max-width:600px){.grid{grid-template-columns:1fr}}

/* ---------- document (preview = paper, also used for print) ---------- */
.doc{max-width:860px;margin:0 auto 8px;background:#fff;color:#111;padding:36px 32px;border-radius:4px;box-shadow:0 1px 3px rgba(0,0,0,.12),0 8px 24px rgba(0,0,0,.06);font-size:13.5px;line-height:1.55}
.doc-head h2{font-size:20px;margin:0 0 12px;color:#111}
.doc-head dl{display:grid;grid-template-columns:max-content 1fr;gap:3px 14px;margin:0 0 18px;font-size:12.5px}
.doc-head dt{color:#555}
.doc-head dd{margin:0;min-width:0;overflow-wrap:anywhere}
.doc code{font-family:"IBM Plex Mono",monospace;font-size:11px;word-break:break-all}
.log{width:100%;border-collapse:collapse;table-layout:fixed}
.log th{text-align:left;font-weight:600;font-size:12px;color:#444;border-bottom:1.5px solid #222;padding:5px 6px}
.log td{border-bottom:1px solid #e2e2e2;padding:5px 6px;vertical-align:top}
.log .c-n{width:44px;color:#777;font-size:11.5px;font-family:"IBM Plex Mono",monospace}
.log .c-t{width:66px;white-space:nowrap}
.log .c-s{width:22%;font-weight:600;overflow-wrap:anywhere}
.log .c-m{white-space:pre-wrap;overflow-wrap:anywhere}
.log tr.day td{background:#f1f1ec;font-weight:600;font-size:12.5px;padding:6px}
.log tr.media .c-m,.log tr.system td.c-m,.log tr.system td.c-s{color:#777;font-style:italic}
.log tr.system td.c-s{font-weight:400}
.log mark{background:#ffe27a;color:#111;padding:0 1px}
.log tr{break-inside:avoid}
.doc-foot{margin:16px 0 0;font-size:11px;color:#666}
@media (max-width:600px){
  .doc{padding:20px 12px;font-size:13px;border-radius:0}
  .doc-head dl{grid-template-columns:1fr}
  .doc-head dt{margin-top:4px}
  .log .c-n{width:32px}.log .c-t{width:52px}.log .c-s{width:26%}
}

@page{
  size:A4; margin:16mm 14mm 18mm;
  @bottom-right{content:"หน้า " counter(page) " / " counter(pages);font-family:"IBM Plex Sans Thai",sans-serif;font-size:9pt;color:#555}
  @bottom-left{content:"tools.tm8labs.com/chat-pdf";font-family:"IBM Plex Sans Thai",sans-serif;font-size:8pt;color:#888}
}
@media print{
  body{background:#fff}
  .ui{display:none !important}
  .doc{display:block !important;max-width:none;margin:0;padding:0;box-shadow:none;border-radius:0;font-size:10.5pt}
  .doc-head dl{grid-template-columns:max-content 1fr}
  .log thead{display:table-header-group}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}