/* เซ็นสวย: cream paper, blue-black ink, one vermilion seal accent. The tool sits on a white "sheet" with a signing line. */
:root{
  --paper:#f7f3ea;--sheet:#fffdf8;--ink:#1d2433;--muted:#5b5f6a;--rule:#ddd5c4;--rule-2:#c4baa5;
  --pen:#1f3a8a;--seal:#b3361f;--seal-ink:#ffffff;--well:#efe9dc;--ok:#1d6a3a;--bad:#a12a1c;
  --wrap:880px;
  --font:"Leelawadee UI","Leelawadee","Thonburi","Noto Sans Thai","Sukhumvit Set",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"Cascadia Mono","SF Mono",Consolas,"Roboto Mono",monospace;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#16181d;--ink:#e9e6df;--muted:#a9a69e;--rule:#33353c;--rule-2:#4a4c54;
    --pen:#9db6ff;--seal:#ef8a73;--seal-ink:#16181d;--well:#202229;--ok:#8fd6a6;--bad:#ff9d8c}
}
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:17px;line-height:1.72}
a{color:var(--pen);text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
img,svg{max-width:100%;height:auto}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:8px 12px;z-index:9}
.skip:focus{left:8px;top:8px}
:focus-visible{outline:3px solid var(--seal);outline-offset:2px;border-radius:6px}

/* header: brand + nav over a double rule, like the head of a form */
.top{border-bottom:3px double var(--rule-2)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:2px 16px;flex-wrap:wrap;padding-top:6px;padding-bottom:6px}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:1.28rem;color:var(--ink);text-decoration:none;min-height:44px;letter-spacing:.01em}
.brand svg{width:34px;height:34px;flex:none}
.nav{display:flex;flex-wrap:wrap;gap:0 4px;list-style:none;margin:0;padding:0}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 10px;color:var(--ink);text-decoration:none;font-size:.97rem;border-bottom:2px solid transparent}
.nav a:hover{border-bottom-color:var(--rule-2)}
.nav a[aria-current]{border-bottom-color:var(--seal);font-weight:700}

main{padding:16px 0 56px}
.crumbs{font-size:.9rem;color:var(--muted);margin:0 0 2px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.75rem,5vw,2.45rem);line-height:1.25;font-weight:800;margin:.2em 0 .3em}
h2{font-size:1.42rem;line-height:1.32;margin:2.2em 0 .5em}
h3{font-size:1.12rem;line-height:1.38;margin:1.5em 0 .3em}
p{margin:0 0 1em}
.lead{font-size:1.06rem;max-width:44em}
ul,ol{padding-left:1.3em}
li{margin:.28em 0}
code{font-family:var(--mono);font-size:.9em;background:var(--well);padding:0 .3em;border-radius:4px}
.muted{color:var(--muted)}
.note{font-size:.92rem;color:var(--muted)}

/* the sheet: white paper with a ruled signing line; stays light in dark mode because it stands for paper */
.sheet{background:var(--sheet);color:#1d2433;border:1px solid var(--rule);border-radius:14px;padding:16px;margin:16px 0 10px;
  box-shadow:0 1px 0 var(--rule),0 10px 24px -18px rgba(40,30,10,.35)}
.sheet a{color:#1f3a8a}
.sheet .muted,.sheet .note{color:#5b5f6a}
@media (prefers-color-scheme:dark){.sheet{border-color:#3a3b40;box-shadow:none}}

.tabs{display:flex;gap:6px;margin:0 0 14px;border-bottom:1px solid #e6dfcf}
.tab{appearance:none;border:0;background:none;font:inherit;font-weight:700;color:#5b5f6a;min-height:44px;padding:0 14px;cursor:pointer;border-bottom:3px solid transparent;margin-bottom:-1px}
.tab[aria-selected=true]{color:#1d2433;border-bottom-color:#b3361f}

.field{display:flex;flex-direction:column;gap:4px;margin:0 0 12px}
.field label,.lbl{font-weight:700;font-size:.95rem}
input[type=text]{font:inherit;font-size:1.15rem;min-height:48px;padding:6px 12px;border:1px solid #c4baa5;border-radius:10px;background:#fff;color:#1d2433;width:100%}
input[type=text]:focus{border-color:#1f3a8a}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;margin:0 0 12px}
.row label{font-size:.95rem}
input[type=range]{accent-color:#b3361f;width:150px;min-height:44px}
input[type=checkbox]{accent-color:#b3361f;width:20px;height:20px;vertical-align:-4px}
select{font:inherit;min-height:44px;padding:0 8px;border:1px solid #c4baa5;border-radius:10px;background:#fff;color:#1d2433}

/* ink swatches */
.inks{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.ink{appearance:none;width:44px;height:44px;border-radius:50%;border:2px solid #fff;box-shadow:0 0 0 1px #c4baa5;background:var(--c);cursor:pointer;padding:0}
.ink[aria-pressed=true]{box-shadow:0 0 0 3px #b3361f}

/* style cards */
.styles{list-style:none;margin:6px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.styles li{margin:0}
.style{appearance:none;width:100%;text-align:left;font:inherit;background:#fff;border:1px solid #e1d9c8;border-radius:12px;padding:10px 12px 8px;cursor:pointer;color:#1d2433;display:flex;flex-direction:column;gap:2px;min-height:112px}
.style:hover{border-color:#c4baa5}
.style[aria-pressed=true]{border-color:#b3361f;box-shadow:0 0 0 2px #b3361f inset}
.style .sig{font-size:2.3rem;line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:clip;color:var(--c,#1f3a8a);padding:4px 2px 2px;border-bottom:1px solid #e6dfcf;min-height:64px}
.style small{font-size:.8rem;color:#5b5f6a}

/* the big preview with a signing line */
.sign{position:relative;margin:14px 0 8px;padding:18px 12px 10px 34px;min-height:150px;display:flex;align-items:flex-end;overflow:hidden}
.sign::before{content:"✕";position:absolute;left:8px;bottom:22px;font-size:1rem;color:#9a8f78}
.sign::after{content:"";position:absolute;left:30px;right:10px;bottom:20px;border-bottom:1.5px solid #9a8f78}
.sign canvas{display:block;max-width:100%;height:auto;max-height:180px;position:relative;z-index:1}
.sign-cap{font-size:.85rem;color:#5b5f6a;margin:0 0 10px 34px}

.btns{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 0}
.btn{appearance:none;font:inherit;font-weight:700;min-height:46px;padding:0 18px;border-radius:999px;border:1.5px solid #1d2433;background:#1d2433;color:#fff;cursor:pointer;display:inline-flex;align-items:center;gap:8px;text-decoration:none}
.btn.ghost{background:transparent;color:#1d2433}
.btn:hover{background:#b3361f;border-color:#b3361f;color:#fff}
.btn:disabled{opacity:.45;cursor:not-allowed;background:#1d2433;border-color:#1d2433;color:#fff}
.btn.ghost:disabled{background:transparent;color:#1d2433}

/* draw pad */
.pad{position:relative;border:1px dashed #c4baa5;border-radius:12px;background:#fff;touch-action:none;margin:0 0 6px}
.pad canvas{display:block;width:100%;height:220px;cursor:crosshair}
.pad::after{content:"";position:absolute;left:40px;right:16px;bottom:52px;border-bottom:1.5px solid #ddd5c4;pointer-events:none}
.pad-hint{position:absolute;left:0;right:0;top:40%;text-align:center;color:#9a8f78;pointer-events:none;font-size:.95rem}

/* remove-background tool */
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;text-align:center;border:2px dashed #c4baa5;border-radius:14px;padding:26px 14px;background:#fff;cursor:pointer}
.drop.over{border-color:#b3361f;background:#fff7f4}
.drop b{font-size:1.05rem}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:14px 0 6px}
.compare figure{margin:0}
.compare figcaption{font-size:.85rem;color:#5b5f6a;margin:0 0 4px}
.compare canvas{display:block;width:100%;height:auto;max-height:280px;object-fit:contain;border:1px solid #e1d9c8;border-radius:10px}
.checker{background-color:#fff;background-image:linear-gradient(45deg,#e9e4d8 25%,transparent 25%,transparent 75%,#e9e4d8 75%),linear-gradient(45deg,#e9e4d8 25%,transparent 25%,transparent 75%,#e9e4d8 75%);background-size:16px 16px;background-position:0 0,8px 8px}
@media (max-width:560px){.compare{grid-template-columns:1fr}}

.status{min-height:1.6em;font-size:.92rem;color:#1d6a3a;margin:8px 0 0}
.status.err{color:#a12a1c}

/* content */
.steps{counter-reset:s;list-style:none;padding:0}
.steps>li{counter-increment:s;position:relative;padding-left:42px;margin:.7em 0}
.steps>li::before{content:counter(s);position:absolute;left:0;top:.1em;width:28px;height:28px;border-radius:50%;background:var(--seal);color:var(--seal-ink);font-weight:800;font-size:.9rem;display:flex;align-items:center;justify-content:center}
table{border-collapse:collapse;width:100%;font-size:.95rem;margin:0 0 1.2em}
th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-weight:700;background:var(--well)}
.tblwrap{overflow-x:auto}

.faq h3{margin-top:1.3em}

.tools{list-style:none;padding:0;display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.tools a{display:block;padding:14px 16px;border:1px solid var(--rule);border-radius:12px;color:var(--ink);text-decoration:none;background:var(--well)}
.tools a:hover{border-color:var(--seal)}
.tools b{display:block;font-size:1.05rem}
.tools span{font-size:.92rem;color:var(--muted)}

/* footer */
.foot{border-top:3px double var(--rule-2);padding:18px 0 28px;font-size:.92rem;color:var(--muted)}
.foot ul{list-style:none;padding:0;margin:0 0 8px;display:flex;flex-wrap:wrap;gap:0 4px}
.foot a{color:var(--muted);display:inline-flex;min-height:44px;align-items:center;padding:0 8px 0 0}
.foot p{margin:0}

/* practice sheet: only shows when printing */
#practice{display:none}
@media print{
  body{background:#fff}
  body>*:not(#practice){display:none!important}
  #practice{display:block;color:#000;font-family:var(--font)}
  #practice h2{margin:0 0 4px;font-size:16pt}
  #practice p{margin:0 0 10pt;font-size:10pt}
  #practice .pr{display:flex;align-items:flex-end;gap:16pt;height:20mm;border-bottom:.6pt solid #999;break-inside:avoid}
  #practice img{height:16mm;width:auto}
  @page{margin:14mm}
}
@media (prefers-reduced-motion:no-preference){.style,.btn,.tools a{transition:border-color .15s,background-color .15s,box-shadow .15s}}
.sheet h2.pick{font-size:1rem;margin:20px 0 0}