/* aifree.in.th — shared look for the hub page and future apps.
   Layout: bright paper-white ground, one blue ink accent; hero = headline + byline beside a stack of paper sheets. */
:root{
  --bg:#f4f7fb; --panel:#ffffff; --fg:#17202e; --muted:#5b6678; --line:#d9e0ea;
  --ink:#1f45b5; --ink-deep:#16328a; --ink-fg:#ffffff; --ink-soft:#e8eefc;
  --ok:#137a4b; --ok-soft:#e3f4ea;
  --ui:"IBM Plex Sans Thai",system-ui,-apple-system,"Segoe UI",sans-serif;
  --display:"Noto Serif Thai","IBM Plex Sans Thai",Georgia,serif;
  color-scheme:light;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;background:var(--bg);color:var(--fg);font-family:var(--ui);font-size:16px;line-height:1.65}
a{color:var(--ink)}
img{max-width:100%}
.wrap{width:100%;max-width:1080px;margin:0 auto;padding-inline:16px}
.site-head{background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(8px);-webkit-backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.site-head .wrap{display:flex;align-items:center;gap:16px;min-height:64px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--fg);font-weight:600;font-size:18px;margin-right:auto}
.logo-mark{width:34px;height:34px;border-radius:9px;background:var(--ink);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700;letter-spacing:.02em}
.logo small{color:var(--muted);font-weight:400;font-size:14px}
.nav{display:flex;gap:4px}
.nav a{text-decoration:none;color:var(--fg);font-size:15px;padding:8px 12px;border-radius:8px}
.nav a:hover{background:var(--ink-soft);color:var(--ink)}
.hero{background:linear-gradient(180deg,#ffffff 0%,var(--bg) 100%);border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:40px;align-items:center;padding-block:56px 60px}
.eyebrow{display:inline-block;font-size:13px;letter-spacing:.04em;color:var(--ink);font-weight:600;background:var(--ink-soft);padding:4px 12px;border-radius:999px}
.hero h1{margin:16px 0 0;font-family:var(--display);font-size:clamp(30px,5vw,48px);line-height:1.3;font-weight:700;text-wrap:balance}
.hero h1 em{font-style:normal;color:var(--ink)}
.lead{margin:16px 0 0;color:var(--muted);font-size:18px;max-width:52ch}
.cta{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 20px;border-radius:10px;font-weight:600;font-size:16px;text-decoration:none;border:1px solid var(--line);background:var(--panel);color:var(--fg)}
.btn.primary{background:var(--ink);border-color:var(--ink);color:#fff}
.btn.primary:hover{background:var(--ink-deep)}
.btn:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.byline{display:flex;align-items:center;gap:12px;margin-top:30px;padding-top:22px;border-top:1px solid var(--line);max-width:52ch}
.avatar{flex:none;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:700;overflow:hidden;position:relative}
.avatar img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.byline .avatar{width:48px;height:48px;font-size:15px}
.byline b{display:block;font-size:16px}
.byline > div > span{display:block;color:var(--muted);font-size:14px;line-height:1.45}
.papers{position:relative;height:340px;max-width:100%}
.sheet{position:absolute;width:56%;aspect-ratio:210/297;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 8px 28px rgba(23,32,46,.10);padding:8% 9%;display:flex;flex-direction:column;gap:9px}
.sheet i{display:block;height:5px;border-radius:3px;background:#e3e8f0}
.sheet i.s{width:55%}.sheet i.m{width:78%}.sheet i.t{width:40%;height:7px;background:#cfd8e6;margin-bottom:6px}
.sheet i.fill{background:var(--ink);opacity:.55;width:62%}
.sheet.a{left:6%;top:6%;transform:rotate(-7deg)}
.sheet.b{left:22%;top:0;transform:rotate(3deg)}
.sheet.c{left:38%;top:8%;transform:rotate(-1.5deg);z-index:2}
.sig{margin-top:auto;align-self:flex-end;width:50%;height:auto}
.stamp{position:absolute;right:0;bottom:4%;z-index:3;background:var(--ok);color:#fff;font-weight:700;font-size:14px;padding:8px 14px;border-radius:10px;transform:rotate(-6deg);box-shadow:0 6px 18px rgba(19,122,75,.3)}
.points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;padding-block:28px 6px}
.point{display:flex;gap:12px;align-items:flex-start;padding:16px;background:var(--panel);border:1px solid var(--line);border-radius:12px;min-width:0}
.point svg{flex:none;width:26px;height:26px;color:var(--ink)}
.point b{display:block;font-size:16px}
.point span{display:block;color:var(--muted);font-size:14px;line-height:1.5}
.sec-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;padding-block:36px 14px}
.sec-head h2{margin:0;font-family:var(--display);font-size:clamp(24px,3.4vw,30px);font-weight:700}
.sec-head span{color:var(--muted);font-size:15px}
.bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding-block:0 18px}
.search{flex:1 1 240px;min-width:0;font:inherit;font-size:16px;padding:10px 14px;min-height:46px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--fg)}
.search:focus-visible{outline:2px solid var(--ink);outline-offset:1px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:inherit;font-size:14px;min-height:40px;padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:var(--panel);color:var(--fg);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--ink-soft);border-color:var(--ink);color:var(--ink)}
.chip:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px}
.card{display:flex;flex-direction:column;gap:12px;padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:14px;text-decoration:none;color:var(--fg);min-width:0;transition:border-color .15s,box-shadow .15s,transform .15s}
a.card:hover{border-color:var(--ink);box-shadow:0 8px 24px rgba(31,69,181,.12);transform:translateY(-2px)}
a.card:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.card-top{display:flex;align-items:center;gap:12px}
.tile{flex:none;width:50px;height:50px;border-radius:13px;display:grid;place-items:center;font-weight:700;font-size:14px;color:#fff;letter-spacing:.02em}
.card h3{margin:0;font-size:19px;font-weight:600;line-height:1.35}
.card p{margin:0;color:var(--muted);font-size:15px;flex:1}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tag{font-size:12px;padding:2px 10px;border-radius:999px;background:var(--bg);color:var(--muted);border:1px solid var(--line)}
.tag.new{background:var(--ok-soft);color:var(--ok);border-color:transparent;font-weight:600}
.go{font-weight:600;color:var(--ink);font-size:15px}
.empty{grid-column:1/-1;padding:28px;text-align:center;color:var(--muted);background:var(--panel);border:1px dashed var(--line);border-radius:12px}
.about{margin-block:48px 56px;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:28px;display:grid;grid-template-columns:auto minmax(0,1fr);gap:24px;align-items:center}
.about .avatar{width:112px;height:112px;font-size:30px;box-shadow:0 0 0 6px var(--ink-soft)}
.about small{color:var(--ink);font-weight:600;font-size:13px;letter-spacing:.06em}
.about h2{margin:4px 0 0;font-family:var(--display);font-size:26px;font-weight:700;line-height:1.3}
.about .full{font-size:16px;margin-top:2px}
.about .role{color:var(--muted);font-size:15px}
.about p{margin:12px 0 0;max-width:62ch}
.links{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.links a{font-size:14px;padding:6px 14px;border-radius:999px;border:1px solid var(--line);text-decoration:none;color:var(--fg)}
.links a:hover{border-color:var(--ink);color:var(--ink)}
.site-foot{margin-top:auto;border-top:1px solid var(--line);background:var(--panel);color:var(--muted);font-size:14px}
.site-foot .wrap{padding-block:20px;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
@media (max-width:820px){
  .hero .wrap{grid-template-columns:1fr;gap:8px;padding-block:28px 40px}
  .papers{display:none}
  .points{grid-template-columns:1fr}
  .nav{display:none}
}
@media (max-width:560px){
  .about{grid-template-columns:1fr;text-align:center;justify-items:center;padding:24px 18px}
  .about p{text-align:left}
  .links{justify-content:center}
  .lead{font-size:17px}
}
@media (prefers-reduced-motion:reduce){.card{transition:none}html{scroll-behavior:auto}}