/* เรียงให้ถูก — สไตล์การ์ตูนหนา ๆ ขอบน้ำเงินเข้ม เงาแข็งแบบ 3D */
:root{
  --ink:#1c2745; --paper:#fffdf6; --grape:#7a5cff; --grape-d:#4b32c4; --sky:#46bdfc; --sky-d:#1c86c9;
  --sun:#ffc928; --sun-d:#c98f00; --coral:#ff6464; --coral-d:#c63535; --mint:#2fd08a; --mint-d:#158a58; --pink:#ff9bd0;
  --r:20px; --font:'Mitr','Sarabun','Tahoma',sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{font-family:var(--font);color:var(--ink);font-size:17px;line-height:1.45;
  background:
   radial-gradient(120px 60px at 12% 14%,#fff 60%,transparent 62%),
   radial-gradient(160px 70px at 18% 12%,#fff 60%,transparent 62%),
   radial-gradient(150px 64px at 82% 9%,#fff 60%,transparent 62%),
   radial-gradient(110px 54px at 90% 11%,#fff 60%,transparent 62%),
   linear-gradient(#78cffb 0,#bfe9ff 45%,#fff2bd 100%);
  background-attachment:fixed}
button,input,textarea{font-family:inherit;font-size:inherit;color:inherit}
.hidden{display:none!important}

/* กล่อง / ปุ่ม */
.panel{background:var(--paper);border:4px solid var(--ink);border-radius:var(--r);box-shadow:0 8px 0 var(--ink);padding:20px}
.btn{--bg:var(--sun);--bgd:var(--sun-d);display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  background:var(--bg);border:4px solid var(--ink);border-radius:16px;padding:10px 22px;font-weight:600;font-size:1.05rem;
  box-shadow:0 6px 0 var(--ink);transform:translateY(0);transition:transform .08s,box-shadow .08s,filter .15s}
.btn:hover{filter:brightness(1.06)}
.btn:active:not(:disabled){transform:translateY(5px);box-shadow:0 1px 0 var(--ink)}
.btn:disabled{filter:grayscale(.8) opacity(.6);cursor:not-allowed}
.btn.grape{--bg:var(--grape);color:#fff}.btn.mint{--bg:var(--mint)}.btn.coral{--bg:var(--coral);color:#fff}
.btn.sky{--bg:var(--sky)}.btn.white{--bg:#fff}.btn.big{font-size:1.4rem;padding:14px 32px;border-radius:20px}
.btn.small{font-size:.9rem;padding:5px 14px;border-width:3px;box-shadow:0 4px 0 var(--ink);border-radius:12px}
.btn:focus-visible,input:focus-visible,textarea:focus-visible,.card:focus-visible,.slot:focus-visible{outline:4px solid var(--grape);outline-offset:3px}
input[type=text],input[type=password],textarea{width:100%;background:#fff;border:4px solid var(--ink);border-radius:14px;padding:10px 14px;box-shadow:inset 0 4px 0 #0001}
input::placeholder,textarea::placeholder{color:#7a85a3}
label{font-weight:500;display:block;margin:12px 0 4px}
h1,h2,h3{margin:.2em 0;line-height:1.15}
h1{font-size:2.3rem}h2{font-size:1.6rem}h3{font-size:1.2rem}
.muted{color:#4a5679}
.err{background:#ffe1e1;border:3px solid var(--coral-d);border-radius:12px;padding:8px 14px;margin-top:12px;font-weight:500}
.chip{display:inline-flex;align-items:center;gap:6px;border:3px solid var(--ink);border-radius:999px;padding:2px 14px;background:#fff;font-weight:500;font-size:.95rem}
.center{text-align:center}
.wrap{max-width:560px;margin:0 auto;padding:22px 16px 40px}

/* PIN 3D */
.pin{display:flex;gap:8px;justify-content:center}
.pin b{width:2.1ch;height:1.5em;display:grid;place-items:center;font-size:2.6rem;background:#fff;border:4px solid var(--ink);border-radius:14px;box-shadow:0 7px 0 var(--ink);color:var(--grape-d)}

/* มาสคอต */
.mascot{width:150px;height:150px;animation:bob 2.2s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-10px) rotate(-2deg)}}

/* ===== บัตร ===== */
.card{--bg:#dff3ff;color:var(--ink);position:relative;cursor:grab;user-select:none;touch-action:manipulation;
  transition:transform .15s,filter .15s}
.card .face{position:relative;display:flex;align-items:center;gap:10px;padding:8px 12px;min-height:60px;
  background:var(--bg);border:3.5px solid var(--ink);border-radius:14px;box-shadow:0 5px 0 var(--ink);font-weight:500;line-height:1.2;font-size:.95rem}
.card .ico{font-size:1.7rem;flex:none;filter:drop-shadow(0 2px 0 #0003)}
.card:hover{transform:perspective(500px) rotateX(5deg) rotateY(-5deg) translateY(-3px)}
.card.sel{transform:translateY(-6px) scale(1.04)}
.card.sel .face{box-shadow:0 5px 0 var(--ink),0 0 0 5px var(--grape)}
.card.dragging{opacity:.4}
.card.note{--bg:#fff3b8}
.card.note .face{border-radius:6px;border-top-width:10px;border-top-color:var(--sun-d)}
.card.oval{--bg:#e0d7ff}.card.oval .face{border-radius:999px;justify-content:center;padding:8px 20px}
.card.rect{--bg:#dff3ff}
.card.para{--bg:#fff0bd}.card.para .face{transform:skewX(-12deg);border-radius:8px}
.card.para .face>*{transform:skewX(12deg)}
.card.yes{--bg:#c9f7dc}.card.no{--bg:#ffd3dc}
.card.yes .face,.card.no .face{border-radius:999px;justify-content:center;min-height:44px;padding:4px 16px;font-size:1rem}
.card.dia{--bg:#ffd6ec}
.card.dia .face{display:grid;place-items:center;min-height:84px;padding:0;background:var(--ink);border:0;border-radius:0;box-shadow:none;
  clip-path:polygon(50% 0,100% 50%,50% 100%,0 50%);filter:drop-shadow(0 5px 0 var(--ink))}
.card.dia .face::before{content:'';position:absolute;inset:0;background:var(--bg);clip-path:polygon(50% 5%,96% 50%,50% 95%,4% 50%)}
.card.dia .face>*{position:relative;z-index:1}
.card.dia .face{filter:none}
.card.dia .txt{max-width:56%;text-align:center;font-size:.78rem;line-height:1.15}
.card.dia .ico{display:none}
.card.small .face{min-height:34px;padding:4px 8px;font-size:.78rem;box-shadow:0 3px 0 var(--ink);border-width:3px}
.card.small .ico{font-size:1.1rem}
.card.small.dia .face{min-height:56px;box-shadow:none}
.card.small:hover{transform:none}
.card.static{cursor:default}.card.static:hover{transform:none}

/* ===== กระดานเกม ===== */
.game{display:grid;grid-template-columns:minmax(220px,330px) 1fr;gap:18px;align-items:start}
.tray{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-content:start;padding:14px;background:#ffffffaa;border:4px dashed var(--ink);border-radius:var(--r);min-height:120px}
.tray.over{background:#fff7c2}
.tray .empty{grid-column:1/-1;text-align:center;color:#4a5679;padding:12px}
.tray .card.note,.tray .card.rect,.tray .card.para,.tray .card.dia,.tray .card.oval{grid-column:span 2}
.tray .card.yes,.tray .card.no{grid-column:span 1}
.board{display:grid;gap:6px 10px;padding:18px 16px;background:var(--paper);border:4px solid var(--ink);border-radius:var(--r);box-shadow:0 8px 0 var(--ink)}
.board.seq{grid-template-columns:1fr;max-width:620px}
.board.grid{grid-template-columns:minmax(0,1.3fr) minmax(0,.62fr) minmax(0,1.25fr);grid-template-rows:repeat(15,auto);align-items:center;max-width:760px}
.slot{position:relative;display:flex;align-items:center;justify-content:center;min-height:68px;border:3.5px dashed #1c274577;border-radius:16px;background:#f2efe3;color:#6a7392;font-size:.85rem;text-align:center;padding:4px 6px}
.slot.over{background:#fff3b8;border-color:var(--ink)}
.slot.filled{border:0;background:transparent;padding:0;display:block}
.slot .no{position:absolute;left:-2px;top:-10px;z-index:2;background:var(--ink);color:#fff;border-radius:999px;min-width:26px;height:26px;display:grid;place-items:center;font-size:.8rem}
.board.grid .slot{min-height:60px}
.board.grid .slot.lab{min-height:42px}
.arrow{text-align:center;color:var(--ink);font-size:1rem;line-height:.6;height:12px;opacity:.7}
.slot.ok .face{box-shadow:0 5px 0 var(--mint-d),0 0 0 4px var(--mint)}
.slot.bad .face{box-shadow:0 5px 0 var(--coral-d),0 0 0 4px var(--coral)}
.slot.ok.dia,.slot.bad.dia{filter:none}
.slot .fix{margin-top:6px}
.slot.bad .card.dia .face::before{background:#ffd0d0}
.pop{animation:pop .35s cubic-bezier(.2,1.6,.4,1)}
@keyframes pop{0%{transform:scale(.6);opacity:0}100%{transform:scale(1);opacity:1}}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}

/* ===== นับถอยหลัง ===== */
.countdown{position:fixed;inset:0;z-index:50;display:grid;place-items:center;text-align:center;
  background:radial-gradient(circle at 50% 40%,var(--grape) 0,var(--grape-d) 70%);color:#fff}
.countdown .num{font-size:min(38vw,300px);font-weight:800;line-height:1;text-shadow:0 6px 0 var(--ink),0 12px 0 #0004,-3px 0 0 var(--ink),3px 0 0 var(--ink);animation:thump .9s ease-out infinite}
@keyframes thump{0%{transform:scale(1.5);opacity:0}25%{opacity:1}100%{transform:scale(1)}}
.countdown h2{font-size:2.2rem;text-shadow:0 4px 0 var(--ink)}
.modal{position:fixed;inset:0;z-index:40;background:#1c274599;display:grid;place-items:center;padding:16px}
.modal .panel{max-width:480px;width:100%}
#confetti{position:fixed;inset:0;pointer-events:none;z-index:60}
.topbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-bottom:16px}
.timer{font-size:1.6rem;font-weight:700;background:var(--ink);color:#fff;border-radius:14px;padding:2px 16px;min-width:5.5ch;text-align:center}
.spacer{flex:1}
.burst{display:inline-block;background:var(--coral);color:#fff;border:4px solid var(--ink);border-radius:999px;padding:4px 22px;font-size:1.5rem;font-weight:700;box-shadow:0 5px 0 var(--ink);transform:rotate(-3deg)}
@media (max-width:820px){
  .game{grid-template-columns:1fr}
  .tray{grid-template-columns:repeat(2,1fr)}
  .board.grid{grid-template-columns:1.2fr .7fr 1.2fr}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* การ์ดโจทย์บนจอครู */
.showcards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;align-items:center}
.card.big .face{font-size:1.25rem;min-height:84px;padding:10px 16px}
.card.big .ico{font-size:2.3rem}
.card.big.dia .face{min-height:130px;font-size:1rem}
.card.big.dia .txt{font-size:1rem;max-width:58%}
.card.big.yes .face,.card.big.no .face{min-height:64px;font-size:1.3rem}

a.btn{text-decoration:none;color:var(--ink)}
a.btn.grape{color:#fff}