:root{
  /* โทนสีตาม tangchang.art (กระดาษ/หมึก/ตราแดง) + ปุ่มดำแบบ tangchangmuseum.com */
  --ink:#141210;
  --muted:#6e675e;
  --line:#e4ddd2;
  --bg:#f7f4ee;
  --card:#ffffff;
  --brand:#141210;
  --brand-dk:#2a2622;
  --brand-lt:#efe9df;
  --seal:#a3281d;
  --ok:#2f6b3a;
  --ok-lt:#e7efe3;
  --ok-line:#c9dcc4;
  --warn:#8a5a00;
  --warn-lt:#f6ecd6;
  --warn-line:#e8d3a6;
  --bad:#a3281d;
  --bad-lt:#f6e3e0;
  --off:#eeeae3;
  --past:#c9c2b8;
  --r:10px;
  --sans:"Noto Sans Thai",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Noto Serif Thai",Georgia,serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;touch-action:manipulation} /* iOS: ปิด double-tap zoom ตอนกดปุ่มเร็ว ๆ (pinch zoom ยังใช้ได้) */
button,a,input,label{touch-action:manipulation}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 var(--sans);}
a{color:var(--brand-dk)}
button,input{font:inherit;color:inherit}
button{cursor:pointer}
[hidden]{display:none!important}
em{font-style:normal;color:var(--muted);font-weight:400}

header.site,footer.site{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 20px;max-width:880px;margin:0 auto;
}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink)}
.brand-logo{height:56px;width:auto;display:block}
.brand-mark{font-family:var(--serif);font-weight:600;font-size:22px;letter-spacing:.02em;color:var(--ink)}
.brand-name{font-size:14px;color:var(--muted)}
@media (max-width:560px){.brand{gap:10px}.brand-logo{height:46px}.brand-mark{font-size:17px}}
.lang button{background:none;border:1px solid var(--line);padding:5px 10px;border-radius:999px;font-size:13px;color:var(--muted)}
.lang button.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.lang{display:flex;gap:4px;flex-shrink:0}
footer.site{color:var(--muted);font-size:13px;padding-bottom:40px}

.wrap{max-width:880px;margin:0 auto;padding:0 16px 24px}
.intro h1{font-family:var(--serif);font-weight:600;font-size:clamp(28px,5vw,38px);margin:10px 0 6px}
.lead{color:var(--muted);margin:0 0 20px;max-width:60ch;text-wrap:pretty}

.steps{display:flex;gap:6px;list-style:none;padding:0;margin:0 0 16px;counter-reset:s}
.steps li{flex:1;display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;background:#fff;border:1px solid var(--line);color:var(--muted);font-size:13px}
.steps li span{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:var(--line);font-size:12px;font-weight:600}
.steps li.on{border-color:var(--brand);color:var(--ink)}
.steps li.on span{background:var(--brand);color:#fff}
.steps li.done span{background:var(--ok);color:#fff}
.steps li b{font-weight:500}
.steps li.back{cursor:pointer}
.steps li.back:hover{border-color:var(--ok)}
@media (max-width:560px){.steps li{flex-direction:column;gap:3px;padding:7px 2px;font-size:11px;text-align:center;line-height:1.25}}
.nw{white-space:nowrap}

.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-bottom:16px}
.panel h2{font-family:var(--serif);font-weight:600;font-size:22px;margin:0 0 14px}

/* calendar */
.cal-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.cal-head h2{margin:0}
.nav{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;font-size:22px;line-height:1}
.nav:disabled{opacity:.3;cursor:default}
.dow,.days{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.dow span{text-align:center;font-size:12px;color:var(--muted);padding:4px 0}
.dow span:first-child{color:var(--seal)}
.day{aspect-ratio:1;border-radius:12px;border:1px solid transparent;background:transparent;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;font-size:15px;color:var(--muted);padding:0}
.day.pad{visibility:hidden}
.day.past{color:var(--past)}
.day.open{background:var(--ok);color:#fff;border-color:var(--ok);font-weight:600}
.day.few{background:#b7791f;color:#fff;border-color:#b7791f;font-weight:600}
.day.full{background:var(--off);color:var(--muted);text-decoration:line-through}
.day.open:hover,.day.few:hover{filter:brightness(1.12)}
.day.today{border-color:var(--ink);color:var(--ink);font-weight:600}
.day.today small{font-size:9px;opacity:1;font-weight:500}
.day.sel{outline:3px solid var(--ink);outline-offset:2px}
.day small{font-size:10px;line-height:1;opacity:.8}
.legend{display:flex;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin:14px 0 0}
.legend span{display:inline-flex;align-items:center;gap:6px}
.dot{width:12px;height:12px;border-radius:4px;display:inline-block}
.dot.open{background:var(--ok)}
.dot.few{background:#b7791f}
.dot.full{background:var(--off)}
.note{color:var(--muted);font-size:14px;margin:12px 0 0}
.cal[aria-busy="true"] .days{opacity:.4}

/* slots */
.slots{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin-bottom:18px}
.slot{border:1px solid var(--line);border-radius:12px;padding:14px;text-align:left;background:#fff;display:flex;flex-direction:column;gap:4px}
.slot b{font-size:18px;font-weight:600}
.slot small{color:var(--muted)}
.slot.sel{border-color:var(--brand);background:var(--brand-lt)}
.slot:disabled{opacity:.5;cursor:not-allowed}
.slot .tag{align-self:flex-start;font-size:12px;padding:2px 8px;border-radius:999px;background:var(--ok-lt);color:var(--ok)}
.slot .tag.few{background:var(--warn-lt);color:var(--warn)}
.slot .tag.full{background:var(--bad-lt);color:var(--bad)}
.qty{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:6px}
.qty label{font-weight:500}
.qty-ctl{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden}
.qty-ctl button{width:42px;height:42px;border:0;background:#fff;font-size:20px}
.qty-ctl input{width:56px;text-align:center;border:0;border-left:1px solid var(--line);border-right:1px solid var(--line);-moz-appearance:textfield}
.qty-ctl input::-webkit-inner-spin-button{display:none}
.qty small{color:var(--muted);flex-basis:100%;line-height:1.6}
.qty small .group a{color:var(--ink)}
.qty small .group.hot{color:var(--ink);font-weight:600}

/* form */
fieldset{border:0;padding:0;margin:0 0 18px}
legend{font-weight:600;font-size:16px;margin-bottom:8px;padding:0}
.hint{color:var(--muted);font-size:14px;margin:0 0 10px;text-wrap:pretty}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:560px){.grid2{grid-template-columns:1fr}}
label{display:block}
label>span{display:block;font-size:14px;margin-bottom:4px;color:var(--muted)}
input[type=text],input[type=email],input[type=tel]{
  width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;margin-bottom:10px
}
input:focus{outline:2px solid var(--brand);outline-offset:0;border-color:transparent}
input.bad{border-color:var(--bad);background:var(--bad-lt)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.box{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:16px 16px 6px;margin:0 0 18px}
.box>legend{float:left;width:100%;font-size:17px;margin:0 0 6px}
.box>legend+*{clear:both}
.att{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px 4px;margin-bottom:12px}
.att-f .grid2{gap:0 12px}
.same,.news{display:flex;gap:8px;align-items:flex-start;font-size:14px;color:var(--muted);margin:0 0 10px;cursor:pointer}
.same input,.news input{margin-top:4px}
.news{margin:-4px 0 12px}
.att .n{font-weight:600;font-size:15px;color:var(--ink);margin:0 0 8px;padding-bottom:6px;border-bottom:1px solid var(--line)}
@media (max-width:560px){.box{padding:12px 12px 4px}.att{padding:10px 12px 2px}}
.agree{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted);margin:0 0 14px}
.agree input{margin-top:4px}
.agree b{color:var(--ink);font-weight:600}
.summary{background:var(--brand-lt);border-radius:10px;padding:12px 14px;margin-bottom:18px;display:flex;flex-wrap:wrap;gap:6px 18px;font-size:15px}
.summary b{font-weight:600}
.err{background:var(--bad-lt);color:var(--bad);padding:10px 12px;border-radius:10px;font-size:14px;margin:0 0 12px}

/* buttons */
.actions{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.actions.center{justify-content:center}
.primary,.ghost{padding:12px 22px;border-radius:8px;border:1px solid transparent;font-weight:500;text-decoration:none;display:inline-block}
.primary{background:var(--brand);color:#fff}
.primary:hover{background:var(--brand-dk)}
.primary:disabled{background:var(--past);cursor:not-allowed}
.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.primary.busy{position:relative;color:transparent}
.primary.busy::after{content:"";position:absolute;inset:0;margin:auto;width:18px;height:18px;border:2px solid #fff;border-right-color:transparent;border-radius:50%;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* done */
.done{text-align:center}
.check{width:64px;height:64px;border-radius:50%;background:var(--ok);color:#fff;font-size:34px;display:grid;place-items:center;margin:4px auto 12px}
.code{font-size:18px}
.code b{font-family:ui-monospace,Menlo,monospace;letter-spacing:.08em;background:var(--brand-lt);padding:4px 10px;border-radius:8px}

.info{margin-top:20px;padding:16px 18px;color:var(--muted);font-size:14px;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--seal);border-radius:var(--r)}
.info b{color:var(--ink);font-weight:600}
.info li{margin-bottom:4px}
.info h3{color:var(--ink);font-size:15px;margin:0 0 6px}
.info ul{margin:0 0 10px;padding-left:20px}
.contact{margin:0}

/* manage */
.danger{padding:12px 22px;border-radius:8px;border:1px solid var(--bad);background:#fff;color:var(--bad);font-weight:500}
.danger:hover{background:var(--bad-lt)}
.danger.busy{position:relative;color:transparent}
.danger.busy::after{content:"";position:absolute;inset:0;margin:auto;width:18px;height:18px;border:2px solid var(--bad);border-right-color:transparent;border-radius:50%;animation:spin .7s linear infinite}
.code .tag{font-size:13px;padding:2px 10px;border-radius:999px;vertical-align:middle;background:var(--ok-lt);color:var(--ok)}
.code .tag.few{background:var(--warn-lt);color:var(--warn)}
.code .tag.full{background:var(--bad-lt);color:var(--bad)}
.names{margin:0 0 16px;padding-left:20px;color:var(--muted)}
#box[aria-busy="true"] #msg{opacity:.6}
.tickets{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px;margin:0 0 18px}
.ticket{border:1px solid var(--line);border-radius:12px;padding:14px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:2px}
.ticket small{color:var(--muted);font-size:12px}
.ticket b{font-size:17px;margin-bottom:6px}
.ticket img{image-rendering:pixelated;width:180px;height:180px}
.ticket code{font-size:12px;color:var(--muted)}
.cal-links{text-align:center;font-size:14px;margin:14px 0 0}
.cal-links a{color:var(--ink)}
.ticket .wallet{margin-top:8px;background:#000;color:#fff;text-decoration:none;font-size:13px;font-weight:600;padding:7px 14px;border-radius:8px}