/* Layout: full-screen ocean canvas; HUD floats on top; sandy "treasure-map" cards for dialogs. Single deliberate underwater look. */
:root{
  --deep:#062a46; --sea:#0d5c86; --foam:#eafcff;
  --sand:#fff3d6; --sand-2:#f6dfa8; --ink:#173a52;
  --gold:#ffc53a; --gold-dk:#c98a12; --coral:#ff6f61; --kelp:#2fb98a; --kelp-dk:#1d8a64;
  --font-display:"Baloo 2","Nunito",system-ui,sans-serif;
  --font-body:"Nunito",system-ui,sans-serif;
  color-scheme:dark;
}
[hidden]{display:none!important}
html,body{height:100%}
body{background:var(--deep);color:var(--foam);font-family:var(--font-body);overflow:hidden;touch-action:none;-webkit-user-select:none;user-select:none}
canvas#c{position:fixed;inset:0;width:100%;height:100%;display:block}
button{font-family:var(--font-display);cursor:pointer;border:0}
button:focus-visible{outline:3px solid var(--gold);outline-offset:3px}

.btn{background:var(--gold);color:var(--ink);font-weight:800;font-size:18px;padding:10px 20px;border-radius:16px;box-shadow:0 4px 0 var(--gold-dk);transition:transform .08s}
.btn:active{transform:translateY(3px);box-shadow:0 1px 0 var(--gold-dk)}
.btn.ghost{background:rgba(255,255,255,.16);color:var(--foam);box-shadow:0 4px 0 rgba(0,0,0,.25);backdrop-filter:blur(6px)}
.btn.green{background:var(--kelp);color:#fff;box-shadow:0 4px 0 var(--kelp-dk)}

/* HUD */
#hud{position:fixed;left:0;right:0;top:0;display:flex;flex-wrap:wrap;gap:8px;align-items:flex-start;justify-content:space-between;
  padding-top:calc(10px + env(safe-area-inset-top,0px));padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));pointer-events:none}
#hud > *{pointer-events:auto}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{display:flex;align-items:center;gap:6px;background:rgba(4,26,44,.55);backdrop-filter:blur(6px);border:2px solid rgba(255,255,255,.15);border-radius:999px;padding:4px 12px 4px 6px;font-family:var(--font-display);font-weight:800;font-size:18px;font-variant-numeric:tabular-nums}
.ico{width:22px;height:22px;border-radius:50%;display:inline-block;flex:none}
.ico.coin{background:radial-gradient(circle at 35% 35%,#fff6b0,var(--gold) 45%,var(--gold-dk));box-shadow:inset 0 0 0 2px #e6a51c}
.ico.pearl{background:radial-gradient(circle at 35% 30%,#fff,#dfe9f5 50%,#a9bad1)}
.ico.star{border-radius:0;background:var(--gold);clip-path:polygon(50% 0,61% 35%,98% 35%,68% 57%,79% 91%,50% 70%,21% 91%,32% 57%,2% 35%,39% 35%)}
.ico.lvl{background:var(--coral);color:#fff;font-size:13px;display:grid;place-items:center}
#quest{background:var(--sand);color:var(--ink);border-radius:16px;padding:6px 14px;font-family:var(--font-display);font-weight:800;font-size:17px;box-shadow:0 4px 0 var(--sand-2);max-width:280px;line-height:1.25}
#quest small{display:block;font-family:var(--font-body);font-weight:700;font-size:13px;opacity:.75}
.tools{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.tools .btn{font-size:15px;padding:7px 12px}

/* Overlays */
.overlay{position:fixed;inset:0;display:grid;place-items:center;background:rgba(3,20,36,.45);
  padding-block:calc(16px + env(safe-area-inset-top,0px)) calc(16px + env(safe-area-inset-bottom,0px));
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));overflow-y:auto}
.card{background:var(--sand);color:var(--ink);border-radius:26px;box-shadow:0 8px 0 var(--sand-2),0 20px 50px rgba(0,0,0,.35);width:100%;max-width:560px;padding:24px;position:relative}
.card h2{font-family:var(--font-display);font-size:28px;line-height:1.1;margin:0 0 6px;text-wrap:balance}
.card p{margin:0;line-height:1.5;font-size:17px}

/* Start */
#start .card{max-width:640px;text-align:center}
#start h1{font-family:var(--font-display);font-weight:800;font-size:clamp(36px,8vw,58px);line-height:.95;margin:4px 0 8px;color:var(--ink);text-wrap:balance}
#start h1 span{color:var(--coral)}
.grades{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}
.grade{background:#fff;border:3px solid transparent;border-radius:18px;padding:12px 8px;text-align:center;color:var(--ink);box-shadow:0 4px 0 var(--sand-2)}
.grade b{display:block;font-size:24px}
.grade .age{font-family:var(--font-body);font-weight:800;font-size:14px;color:var(--coral)}
.grade .d{display:block;font-family:var(--font-body);font-weight:700;font-size:13px;line-height:1.35;margin-top:4px;opacity:.85}
.grade[aria-pressed="true"]{border-color:var(--kelp);background:#eafff5}
.howto{font-size:14px!important;opacity:.8;margin-top:12px!important}
.start-actions{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
@media (max-width:520px){.grades{grid-template-columns:1fr}.grade{display:grid;grid-template-columns:auto 1fr;text-align:left;column-gap:12px;align-items:center}.grade b{grid-row:span 2}.card{padding:18px}}

/* Dialog */
#dialog{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:center;
  padding-bottom:calc(16px + env(safe-area-inset-bottom,0px));padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
#dialog .card{max-width:620px;padding:18px 20px 16px}
.speaker{position:absolute;top:-16px;left:20px;background:var(--kelp);color:#fff;font-family:var(--font-display);font-weight:800;padding:2px 14px;border-radius:999px;font-size:16px}
#dlgText{font-size:19px;font-weight:700;min-height:2.6em;margin-top:6px!important}
.dlg-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:10px}

/* Question */
#qmodal .card{max-width:520px;text-align:center}
.qtag{font-family:var(--font-display);font-weight:800;color:var(--coral);font-size:16px;letter-spacing:.04em;text-transform:uppercase}
#qText{font-family:var(--font-display);font-weight:800;font-size:clamp(24px,6vw,36px);line-height:1.2;margin:4px 0 8px;text-wrap:balance}
#qText.long{font-size:clamp(19px,4.6vw,24px);font-family:var(--font-body);line-height:1.4}
#qVisual{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:10px;margin:6px 0 10px;min-height:0}
.grp{display:flex;flex-wrap:wrap;gap:4px;max-width:180px;justify-content:center;background:#fff;border-radius:14px;padding:8px}
.opsign{font-family:var(--font-display);font-weight:800;font-size:30px}
.shell{width:26px;height:24px;border-radius:50% 50% 40% 40%/65% 65% 35% 35%;background:repeating-conic-gradient(from 200deg at 50% 100%,#ff9a8a 0 10deg,#ffc2b4 10deg 20deg);box-shadow:inset 0 -3px 0 rgba(0,0,0,.08);position:relative}
.shell.x{opacity:.35}
.shell.x::after{content:"";position:absolute;left:-2px;right:-2px;top:50%;height:3px;background:var(--ink);transform:rotate(-30deg);border-radius:2px}
.answers{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:8px}
.answers.three{grid-template-columns:repeat(3,1fr)}
.ans{background:#fff;color:var(--ink);font-size:32px;font-weight:800;min-height:68px;border-radius:18px;box-shadow:0 5px 0 var(--sand-2);border:3px solid transparent;transition:transform .08s}
.ans:active{transform:translateY(3px)}
.ans.ok{background:var(--kelp);color:#fff;box-shadow:0 5px 0 var(--kelp-dk)}
.ans.no{background:#ffe1dd;color:#b04a3f;border-color:var(--coral);animation:shake .35s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
#qHint{min-height:1.5em;margin-top:12px!important;font-weight:800;font-size:16px!important}
#qHint.good{color:var(--kelp-dk)}#qHint.bad{color:#b04a3f}
.q-foot{display:flex;justify-content:space-between;gap:8px;margin-top:12px;flex-wrap:wrap}
.q-foot .btn{font-size:15px;padding:8px 14px}
.q-foot .btn.ghost{background:#fff;color:var(--ink);box-shadow:0 4px 0 var(--sand-2)}

/* Shop */
#shop .card{max-width:600px}
.shop-head{display:flex;gap:16px;align-items:center;margin-bottom:12px;flex-wrap:wrap}
#preview{width:150px;height:110px;background:linear-gradient(#5cc6ea,#1679a8);border-radius:18px;flex:none}
.shop-head .money{font-family:var(--font-display);font-weight:800;font-size:20px;display:flex;align-items:center;gap:6px}
.shop h3{font-family:var(--font-display);font-size:19px;margin:12px 0 6px}
.items{display:grid;grid-template-columns:repeat(auto-fill,minmax(110px,1fr));gap:8px}
.item{background:#fff;color:var(--ink);border-radius:14px;padding:8px;border:3px solid transparent;box-shadow:0 4px 0 var(--sand-2);font-size:15px;font-weight:800;display:flex;flex-direction:column;align-items:center;gap:4px}
.item .sw{width:34px;height:22px;border-radius:50%}
.item small{font-family:var(--font-body);font-weight:800;font-size:13px;display:flex;align-items:center;gap:4px}
.item small .ico{width:14px;height:14px}
.item.on{border-color:var(--kelp);background:#eafff5}
.item.locked{opacity:.6}
.close-x{position:absolute;top:10px;right:12px;background:transparent;color:var(--ink);font-size:28px;line-height:1;padding:4px 8px;font-weight:800}

#toast{position:fixed;left:50%;top:calc(76px + env(safe-area-inset-top,0px));transform:translateX(-50%);background:var(--ink);color:var(--foam);font-family:var(--font-display);font-weight:700;font-size:18px;padding:8px 18px;border-radius:999px;box-shadow:0 6px 20px rgba(0,0,0,.3);max-width:calc(100% - 32px);text-align:center;transition:opacity .3s,transform .3s;pointer-events:none}
#toast.hide{opacity:0;transform:translate(-50%,-10px)}
@media (max-width:640px){#toast{top:calc(120px + env(safe-area-inset-top,0px))}#quest{font-size:15px}.chip{font-size:16px}}
@media (prefers-reduced-motion:reduce){.ans.no{animation:none}*{transition:none!important}}

.qboss{display:flex;justify-content:center;align-items:center;gap:6px;margin-top:6px;font-weight:800;font-size:14px}
.qboss span{margin-right:4px}
.qboss i{width:18px;height:18px;border-radius:50%;background:rgba(23,58,82,.15);display:inline-block;transition:background .3s}
.qboss i.on{background:var(--coral);box-shadow:inset 0 -3px 0 rgba(0,0,0,.15)}
.qboss b.hard{background:var(--coral);color:#fff;font-family:var(--font-display);font-size:15px;letter-spacing:.06em;text-transform:uppercase;padding:2px 14px;border-radius:999px}
.qboss b.hard.up{background:#8a3fd1}
.qboss{flex-wrap:wrap}
.ico.grow{background:radial-gradient(circle at 40% 40%,#b8ffcf,var(--kelp) 60%,var(--kelp-dk))}
.gbar{width:54px;height:8px;border-radius:99px;background:rgba(255,255,255,.18);overflow:hidden;display:inline-block}
.gbar i{display:block;height:100%;width:0;background:#7dffb0;border-radius:99px;transition:width .4s}