/* AI100WEB — paper / ink / pine / copper. Proof-first, architectural. */
:root{
  --paper:#f4f1ea; --paper-2:#ebe6db; --card:#fbf9f4; --ink:#1c1915; --ink-2:#4a443b; --muted:#6f685c;
  --pine:#0e6b52; --pine-2:#0a5340; --pine-soft:#dcebe4; --copper:#b85a28; --copper-soft:#f3e2d6;
  --line:#d8d1c3; --ok:#0e6b52; --warn:#b85a28; --bad:#a3261d;
  --r:10px; --shadow:0 1px 0 rgba(28,25,21,.04),0 6px 24px -12px rgba(28,25,21,.18);
  --f-head:"Space Grotesk","IBM Plex Sans Thai",system-ui,sans-serif;
  --f-body:"Inter","IBM Plex Sans Thai",system-ui,sans-serif;
  --f-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
html[lang="th"] body{font-family:"IBM Plex Sans Thai","Inter",system-ui,sans-serif;line-height:1.7}
h1,h2,h3{font-family:var(--f-head);line-height:1.15;letter-spacing:-.01em;margin:0 0 .5em}
html[lang="th"] h1,html[lang="th"] h2,html[lang="th"] h3{font-family:"IBM Plex Sans Thai",var(--f-head);line-height:1.35}
h1{font-size:clamp(2rem,4.6vw,3.4rem);font-weight:700}
h2{font-size:clamp(1.35rem,2.4vw,1.8rem);font-weight:700}
h3{font-size:1.05rem;font-weight:600}
p{margin:0 0 1em}
a{color:var(--pine);text-underline-offset:3px}
a:hover{color:var(--pine-2)}
code,.mono,pre{font-family:var(--f-mono);font-size:.88em}
pre{background:var(--ink);color:#efe9dc;padding:14px 16px;border-radius:var(--r);overflow:auto;max-height:440px;white-space:pre-wrap;word-break:break-word;margin:0}
:focus-visible{outline:2px solid var(--copper);outline-offset:2px}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--paper);padding:8px 12px;border-radius:6px;z-index:50}
.skip:focus{left:8px}
.small{font-size:.86rem}.muted{color:var(--muted)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.hidden{display:none!important}

/* top bar */
.topbar{position:sticky;top:0;z-index:20;background:rgba(244,241,234,.92);backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:18px;height:62px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font:700 1.12rem var(--f-head);letter-spacing:.02em}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--ink-2);text-decoration:none;padding:7px 11px;border-radius:8px;font-weight:500;font-size:.94rem}
.nav a:hover{background:var(--paper-2);color:var(--ink)}
.nav a[aria-current="page"]{background:var(--ink);color:var(--paper)}
.lang{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.lang button{border:0;background:transparent;padding:6px 10px;font:600 .82rem var(--f-head);cursor:pointer;color:var(--ink-2)}
.lang button[aria-pressed="true"]{background:var(--pine);color:#fff}
.navtoggle{display:none;margin-left:auto;border:1px solid var(--line);background:var(--card);border-radius:8px;padding:6px 10px;font:inherit;cursor:pointer}
@media (max-width:860px){
  .navtoggle{display:block}
  .nav{display:none;position:absolute;top:62px;left:0;right:0;flex-direction:column;background:var(--paper);border-bottom:1px solid var(--line);padding:10px 20px}
  .nav.open{display:flex}
  .lang{margin-left:0}
}

/* sections, cards */
main{min-height:70vh;outline:none}
#view{padding-top:34px;padding-bottom:64px}
.hero{padding:34px 0 22px;border-bottom:1px solid var(--line);margin-bottom:28px}
.eyebrow{font:600 .78rem var(--f-head);letter-spacing:.14em;text-transform:uppercase;color:var(--copper);margin-bottom:12px}
.lead{font-size:1.14rem;color:var(--ink-2);max-width:760px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px 20px;box-shadow:var(--shadow);min-width:0}
.card h3{display:flex;align-items:center;gap:8px;justify-content:space-between}
.card .kv{display:grid;grid-template-columns:max-content 1fr;gap:4px 14px;font-size:.92rem}
.card .kv dt{color:var(--muted)}
.card .kv dd{margin:0;word-break:break-all}
.section{margin:34px 0}
.section>h2{display:flex;align-items:baseline;gap:12px}
.section>h2 .num{font:600 .8rem var(--f-mono);color:var(--copper)}
.big{font:700 2rem var(--f-head);letter-spacing:-.02em}
.addr{display:block;background:var(--paper-2);padding:8px 10px;border-radius:8px;word-break:break-all;font-family:var(--f-mono);font-size:.86rem}
.badge{display:inline-block;font:600 .72rem var(--f-head);letter-spacing:.06em;text-transform:uppercase;padding:3px 8px;border-radius:99px;border:1px solid currentColor;white-space:nowrap}
.b-ok{color:var(--ok);background:var(--pine-soft);border-color:transparent}
.b-warn{color:var(--warn);background:var(--copper-soft);border-color:transparent}
.b-bad{color:var(--bad);background:#f5dcd9;border-color:transparent}
.b-mute{color:var(--muted)}
.notice{border-left:3px solid var(--copper);background:var(--copper-soft);padding:10px 14px;border-radius:0 8px 8px 0;margin:12px 0;font-size:.93rem}
.notice.ok{border-color:var(--pine);background:var(--pine-soft)}
.notice.bad{border-color:var(--bad);background:#f5dcd9}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font:600 .78rem var(--f-head);letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.tablewrap{overflow-x:auto}

/* buttons, forms */
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--pine);background:var(--pine);color:#fff;padding:9px 15px;border-radius:8px;font:600 .92rem var(--f-body);cursor:pointer;text-decoration:none;line-height:1.2}
.btn:hover{background:var(--pine-2);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:var(--paper-2);color:var(--ink)}
.btn.copper{background:var(--copper);border-color:var(--copper)}
.btn.sm{padding:5px 10px;font-size:.8rem}
.btn[disabled],.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
label{display:block;font-weight:600;font-size:.88rem;margin:10px 0 4px}
input,select,textarea{width:100%;font:inherit;font-size:.95rem;padding:9px 11px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
textarea{font-family:var(--f-mono);font-size:.84rem;min-height:120px}
input[aria-invalid="true"]{border-color:var(--bad)}
.err{color:var(--bad);font-size:.84rem;min-height:1.2em;margin-top:2px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin-top:4px}
.seg button{border:0;background:transparent;padding:8px 13px;font:600 .86rem var(--f-body);cursor:pointer;color:var(--ink-2)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}
.seg button[aria-pressed="true"].copper{background:var(--copper)}

/* skeletons */
.skel{display:block;height:1em;border-radius:6px;background:linear-gradient(90deg,var(--paper-2) 25%,#f7f4ee 50%,var(--paper-2) 75%);background-size:200% 100%;animation:sk 1.2s infinite linear;margin:6px 0}
.skel.w60{width:60%}.skel.w40{width:40%}.skel.w80{width:80%}.skel.tall{height:2em}
@keyframes sk{to{background-position:-200% 0}}
@media (prefers-reduced-motion:reduce){.skel{animation:none}html{scroll-behavior:auto}}

/* console log */
.log{list-style:none;padding:0;margin:0;max-height:320px;overflow:auto}
.log li{border-bottom:1px dashed var(--line);padding:7px 0;font-size:.84rem;display:flex;gap:10px;flex-wrap:wrap}
.log .t{color:var(--muted);font-family:var(--f-mono)}

/* diagram */
.diagram{width:100%;height:auto;background:var(--card);border:1px solid var(--line);border-radius:var(--r)}

/* modal */
.modal{position:fixed;inset:0;background:rgba(28,25,21,.5);display:flex;align-items:center;justify-content:center;padding:20px;z-index:60}
.modal[hidden]{display:none}
.modal-card{background:var(--card);border-radius:14px;max-width:520px;width:100%;padding:24px;box-shadow:0 30px 80px -20px rgba(0,0,0,.4)}

/* footer */
.foot{border-top:1px solid var(--line);background:var(--paper-2);padding:24px 0;font-size:.9rem}
.foot-in{display:grid;gap:6px}

/* 404 */
.nf{display:flex;min-height:100vh;align-items:center}
.nf-main{padding:60px 20px}
.nf-code{font-size:5rem;font-weight:700;color:var(--copper);margin:24px 0 0;line-height:1}