@font-face{font-family:Sarabun;src:url(font/Sarabun-Regular.ttf) format('truetype');font-weight:400;font-display:block}
@font-face{font-family:Sarabun;src:url(font/Sarabun-SemiBold.ttf) format('truetype');font-weight:600;font-display:block}

:root{
  --bg:#101114; --panel:#191b20; --line:#2c2f37; --ink:#eceef2; --dim:#9aa0ac;
  --accent:#3b82f6; --ok:#22a06b; --warn:#e5484d; --tap:44px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%}
body{
  font:16px/1.55 Sarabun,system-ui,sans-serif;background:var(--bg);color:var(--ink);
  display:flex;flex-direction:column;overscroll-behavior:none;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
header{padding:10px 14px 6px;border-bottom:1px solid var(--line);flex:none}
h1{font-size:17px;margin:0 0 6px;font-weight:600}
#steps{display:flex;gap:4px;font-size:11px;color:var(--dim);flex-wrap:wrap}
#steps span{padding:4px 9px;border-radius:99px;background:var(--panel);white-space:nowrap;cursor:pointer}
#steps span.on{background:var(--accent);color:#fff}
main{flex:1;overflow:auto;padding:14px;-webkit-overflow-scrolling:touch}
.view{display:none}
.view.on{display:block}
.lead{margin:0 0 14px;color:var(--dim);font-size:14px}
.note{color:var(--dim);font-size:12.5px;margin:10px 0 0}
.note.bad{color:#ffb4b6;background:#3a1416;border:1px solid var(--warn);border-radius:8px;padding:8px 10px}

button,.bigbtn{
  font:inherit;color:var(--ink);background:var(--panel);border:1px solid var(--line);
  border-radius:12px;padding:12px 16px;min-height:var(--tap);cursor:pointer;display:inline-block
}
button:disabled{opacity:.4}
button.primary,.bigbtn{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.bigbtn{display:block;text-align:center;margin:20px 0}
.row{display:flex;gap:10px;margin-top:16px}
.row button{flex:1}

.seg{display:flex;gap:0;margin-bottom:16px;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.seg button{flex:1;border:0;border-radius:0;background:transparent}
.seg button.on{background:var(--accent);color:#fff;font-weight:600}

/* จับคู่หน้า */
#assignBar{display:flex;gap:8px;margin-bottom:12px}
#assignBar button{flex:1;font-size:13px;padding:9px 6px;line-height:1.3}
#assignBar button.on{border-color:var(--accent);box-shadow:0 0 0 2px #3b82f640}
#assignBar b{display:block;font-size:11px;color:var(--dim);font-weight:400}
#thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(96px,1fr));gap:8px}
.th{position:relative;border:2px solid var(--line);border-radius:8px;overflow:hidden;background:#fff;cursor:pointer}
.th img{width:100%;display:block}
.th.used{border-color:var(--accent)}
.th .tag{position:absolute;left:0;top:0;background:var(--accent);color:#fff;font-size:11px;padding:1px 6px;border-radius:0 0 6px 0}
.th .no{position:absolute;right:3px;bottom:3px;background:#000a;color:#fff;font-size:11px;padding:0 5px;border-radius:5px}

/* แตะมุม */
#cornerHead{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:8px}
#cornerPage{font-weight:600}
#cornerWhich{color:var(--accent);font-weight:600}
#tapWrap{position:relative;background:#000;border-radius:10px;overflow:hidden;touch-action:none}
#tap{display:block;width:100%;touch-action:none}
#loupe{position:absolute;top:8px;right:8px;border-radius:50%;border:2px solid var(--accent);
  background:#fff;display:none;pointer-events:none}
#loupe.left{right:auto;left:8px}
#cornerChips{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
#cornerChips button{flex:1;font-size:12.5px;padding:9px 4px;min-width:70px}
#cornerChips button.done{border-color:var(--ok)}
#cornerChips button.cur{border-color:var(--accent);box-shadow:0 0 0 2px #3b82f640}

/* ฟอร์ม */
#fields .grp{font-size:12px;color:var(--dim);margin:18px 0 6px;text-transform:uppercase;letter-spacing:.05em}
#fields label{display:block;margin-bottom:11px}
#fields span{display:block;font-size:12.5px;color:var(--dim);margin-bottom:3px}
#fields input,#fields select{
  width:100%;font:inherit;color:var(--ink);background:var(--panel);
  border:1px solid var(--line);border-radius:10px;padding:11px 12px;min-height:var(--tap)
}
#fields input:focus,#fields select:focus{outline:2px solid var(--accent);outline-offset:-1px}

/* ตรวจ */
#previews img{width:100%;border-radius:8px;background:#fff;margin-bottom:12px;display:block}
#warnBox{margin-bottom:12px}
.warn{background:#3a1416;border:1px solid var(--warn);color:#ffb4b6;border-radius:10px;padding:10px 12px;font-size:13.5px;margin-bottom:8px}
.okmsg{background:#10281d;border:1px solid var(--ok);color:#8fe3bb;border-radius:10px;padding:10px 12px;font-size:13.5px}

#busy{position:fixed;inset:0;background:#000c;display:flex;flex-direction:column;gap:14px;
  align-items:center;justify-content:center;z-index:9;font-size:14px}
/* ต้องมีบรรทัดนี้ ไม่งั้น #busy (id selector) ทับ [hidden] ของเบราว์เซอร์
   แล้วแผ่นหมุนจะคลุมทั้งจอตั้งแต่เปิดแอป กินทุกการแตะจนกดอะไรไม่ได้ */
#busy[hidden]{display:none}
.spin{width:36px;height:36px;border:3px solid #ffffff30;border-top-color:#fff;border-radius:50%;animation:sp .8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}

#nudge{display:flex;gap:5px;align-items:center;margin-top:10px;flex-wrap:wrap}
#nudge span{font-size:12px;color:var(--dim);flex:1 0 100%}
#nudge button{flex:1;padding:10px 4px;min-width:44px;font-size:15px}