/* Nunito is loaded via <link> in the HTML <head> so styles
   apply immediately (no render-blocking @import). */
*{margin:0;padding:0;box-sizing:border-box}
:root{--ink:#0f2040;--tile:52px}
html,body{height:100%}
body{
  font-family:'Nunito',system-ui,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(700px 380px at 50% -4%, #ffffff 0%, transparent 62%),
    linear-gradient(180deg,#dff3ff 0%, #c6eaff 38%, #a8d7ff 68%, #90c4f5 100%);
  min-height:100vh;min-height:100dvh;
  overflow-x:hidden;
  display:flex;align-items:center;justify-content:center;
  padding:10px 0 52px;
}
body::before{
  content:'';position:fixed;inset:0;pointer-events:none;opacity:0.45;
  background:
    radial-gradient(120px 120px at 20% 24%, rgba(255,255,255,0.85) 0%, transparent 70%),
    radial-gradient(140px 140px at 82% 18%, rgba(255,255,255,0.4) 0%, transparent 70%);
}
.app{
  width:min(390px,100%);
  padding:0 12px;
  display:flex;flex-direction:column;gap:12px;
  position:relative;z-index:2;
}
header{display:flex;align-items:center;justify-content:space-between;gap:10px}
.header-actions{display:flex;flex-direction:row;align-items:center;gap:4px;flex:none}
.logo{
  font-weight:900;letter-spacing:0.13em;font-size:13px;
  background:rgba(255,255,255,0.8);backdrop-filter:blur(16px) saturate(1.3);
  border:1px solid rgba(255,255,255,0.9);border-radius:999px;
  padding:8px 12px;box-shadow:0 6px 18px rgba(90,150,210,0.18), inset 0 1px 0 #fff;
}
.restart{
  width:36px;height:36px;border-radius:50%;border:1px solid #fff;
  background:linear-gradient(180deg,#fff 0%, #eef8ff 100%);
  box-shadow:0 6px 16px rgba(90,150,210,0.18), inset 0 1px 0 #fff;
  cursor:pointer;display:grid;place-items:center;color:#2a4a6b;
}
.restart:active{transform:scale(0.96)}
.board-frame{
  position:relative;
  background:rgba(255,255,255,0.68);backdrop-filter:blur(20px) saturate(1.3);
  border:1px solid rgba(255,255,255,0.92);border-radius:26px;
  padding:8px;box-shadow:0 18px 44px rgba(70,130,190,0.24), inset 0 1px 0 #fff;
}
.board-frame::before{
  content:'';position:absolute;inset:1px;border-radius:25px;
  background:linear-gradient(180deg,rgba(255,255,255,0.5) 0%, transparent 36%);pointer-events:none;
}
#board{
  position:relative;width:100%;
  aspect-ratio:3/4;
  min-height:440px;max-height:min(62dvh,540px);
  border-radius:18px;overflow:hidden;
  background:
    linear-gradient(rgba(160,195,220,0.22) 1px, transparent 1px),
    linear-gradient(90deg,rgba(160,195,220,0.22) 1px, transparent 1px),
    linear-gradient(180deg,#f3f9ff 0%, #eef6ff 55%, #e6f1ff 100%);
  background-size:22px 22px,22px 22px, auto;
  border:1px solid rgba(255,255,255,0.9);box-shadow:inset 0 1px 0 #fff;
}
.tile{
  position:absolute;width:var(--tile);height:var(--tile);
  background:linear-gradient(180deg,#ffffff 0%, #f7fbff 60%, #eef4ff 100%);
  border-radius:12px;border:1.4px solid rgba(15,32,64,0.95);
  box-shadow:0 4px 0 rgba(15,32,64,1), 0 10px 18px rgba(40,80,130,0.16), inset 0 1px 0 #fff;
  display:flex;align-items:center;justify-content:center;
  cursor:pointer;user-select:none;
  transition:transform 130ms cubic-bezier(.2,.8,.2,1), box-shadow 130ms, filter 130ms;
  overflow:hidden;
}
.tile::before{content:'';position:absolute;inset:1px;border-radius:10px;background:linear-gradient(180deg,rgba(255,255,255,0.95) 0%, transparent 46%);pointer-events:none}
.tile:active{transform:translateY(2px);box-shadow:0 2px 0 #0f2040}
.tile img{width:26px;height:26px;image-rendering:pixelated;position:relative;z-index:1}
.tile.blank{filter:none;opacity:1;cursor:default;pointer-events:none;box-shadow:0 3px 0 #0f2040, 0 6px 14px rgba(0,0,0,0.08);background:linear-gradient(180deg,#e8efff 0%, #d4deed 100%)}
.tile.blank::after{content:'';position:absolute;inset:0;background:rgba(210,220,235,0.78);border-radius:10px}
.tile.blank .back{display:grid;place-items:center;position:absolute;inset:0;z-index:2;color:#8a9ab8;font-size:14px}
.tile.blank img{display:none}
#board.peeking .tile.blank{opacity:1;filter:none;background:linear-gradient(180deg,#ffffff 0%, #f7fbff 60%, #eef4ff 100%)}
#board.peeking .tile.blank::after{background:rgba(255,255,255,0.08)}
#board.peeking .tile.blank img{display:block;opacity:1}
#board.peeking .tile.blank .back{display:none}
/* Peek reveals a single covered tile for a few seconds. */
.tile.peek-reveal{opacity:1;filter:none;background:linear-gradient(180deg,#ffffff 0%, #f7fbff 60%, #eef4ff 100%);box-shadow:0 0 0 3px rgba(0,209,255,0.4), 0 3px 0 #0f2040, 0 6px 14px rgba(0,0,0,0.08)}
.tile.peek-reveal::after{background:rgba(255,255,255,0.08)}
.tile.peek-reveal img{display:block;opacity:1}
.tile.peek-reveal .back{display:none}
.tile.hint{outline:3px solid #00d1ff;outline-offset:1px;box-shadow:0 0 0 7px rgba(0,209,255,0.18), 0 6px 0 #0f2040 !important;animation:hintPop 900ms ease infinite alternate;z-index:60 !important;opacity:1 !important;filter:none !important}
.tile.hint::after{display:none}
@keyframes hintPop{from{transform:translateY(-2px) scale(1.03)}to{transform:translateY(-5px) scale(1.05)}}
.tile.shuffling{animation:tileShuffle 520ms cubic-bezier(.2,.8,.2,1)}
@keyframes tileShuffle{0%{transform:translate(0,0) rotate(0)}22%{transform:translate(-7px,5px) rotate(-2.5deg)}48%{transform:translate(7px,-6px) rotate(2.5deg)}74%{transform:translate(-5px,-4px) rotate(-1.5deg)}100%{transform:translate(0,0) rotate(0)}}
#board.shuffling{pointer-events:none}
/* flying clone */
.fly{
  position:absolute;width:52px;height:52px;pointer-events:none;z-index:80;
  background:linear-gradient(180deg,#fff 0%, #f7fbff 100%);
  border:1.4px solid #0f2040;border-radius:12px;
  display:grid;place-items:center;
  box-shadow:0 5px 0 #0f2040, 0 12px 22px rgba(0,0,0,0.18);
  transition:transform 320ms cubic-bezier(.2,.7,.3,1), opacity 320ms;
}
.fly img{width:26px;height:26px;image-rendering:pixelated}
/* pile — corner, no chrome */
.pile{
  position:absolute;left:8px;bottom:8px;
  width:56px;height:56px;
  background:transparent;border:none;box-shadow:none;
  cursor:pointer;z-index:20;display:block;
}
.pile:active{transform:scale(0.96)}
.pile-inner{position:relative;width:100%;height:100%}
.pile-card{
  position:absolute;left:0;top:0;width:46px;height:46px;
  background:linear-gradient(180deg,#fff 0%, #f2f7ff 100%);
  border:1.4px solid #0f2040;border-radius:10px;
  display:grid;place-items:center;box-shadow:0 3px 0 #0f2040, 0 6px 12px rgba(0,0,0,0.10);
}
.pile-card img{width:22px;height:22px;image-rendering:pixelated}
/* dock */
.dock{
  width:100%;
  background:rgba(255,255,255,0.84);backdrop-filter:blur(20px) saturate(1.35);
  border:1px solid #fff;border-radius:20px;
  padding:8px;box-shadow:0 14px 32px rgba(70,130,190,0.22), inset 0 1px 0 #fff;
  display:flex;flex-direction:column;gap:8px;position:relative;z-index:10;
}
.slots{
  display:grid;grid-template-columns:repeat(7,1fr);gap:6px;
  background:linear-gradient(180deg,rgba(15,32,64,0.05), rgba(15,32,64,0.02));
  border-radius:14px;padding:6px;
  border:1px solid rgba(255,255,255,0.85);box-shadow:inset 0 1px 0 rgba(255,255,255,0.9);
}
.slot{
  aspect-ratio:1;border-radius:10px;
  background:linear-gradient(180deg,#f7fbff 0%, #eef4ff 100%);
  border:1.4px dashed rgba(15,32,64,0.15);
  display:grid;place-items:center;box-shadow:inset 0 1px 0 #fff;overflow:hidden;
  transition:transform 200ms, opacity 200ms, filter 200ms;
}
.slot.filled{background:linear-gradient(180deg,#fff 0%, #f5f9ff 100%);border-style:solid;border-color:#0f2040;box-shadow:0 2px 0 #0f2040, inset 0 1px 0 #fff}
.slot.filled img{width:24px;height:24px;image-rendering:pixelated}
.slot.pop{animation:slotIn 300ms cubic-bezier(.2,.9,.2,1)}
@keyframes slotIn{0%{transform:scale(0.75)}60%{transform:scale(1.06)}100%{transform:scale(1)}}
.slot.clearing{animation:trayClear 380ms cubic-bezier(.2,.8,.2,1) forwards}
@keyframes trayClear{
  0%{transform:scale(1);opacity:1;filter:brightness(1)}
  28%{transform:scale(1.12);filter:brightness(1.08);box-shadow:0 0 0 3px rgba(0,209,255,0.45), 0 2px 0 #0f2040}
  100%{transform:scale(0.42);opacity:0;filter:brightness(1.15)}
}
.tools{
  display:grid;grid-template-columns:repeat(5,1fr);gap:6px;width:100%;
}
.tool{
  width:100%;height:42px;border-radius:12px;border:1px solid #fff;
  background:linear-gradient(180deg,#fff 0%, #eef7ff 100%);
  box-shadow:0 5px 14px rgba(70,130,190,0.14), inset 0 1px 0 #fff;
  display:grid;place-items:center;cursor:pointer;position:relative;
  color:#0f2040;transition:transform 120ms, opacity 120ms;font-size:14px;
}
.tool:active{transform:scale(0.96)}
.tool:disabled,.tool.used{
  background:linear-gradient(180deg,#e6ecf5 0%, #d6deee 100%) !important;
  border-color:#c5d1e6 !important;
  color:#94a6c2 !important;
  box-shadow:none !important;
  opacity:1;
  filter:grayscale(0.9) brightness(0.98);
  cursor:not-allowed;transform:none;
}
.tool:disabled i,.tool.used i{color:#94a6c2}
.tool.peek-active{outline:2px solid #00d1ff}
.overlay{position:fixed;inset:0;background:rgba(175,210,240,0.42);backdrop-filter:blur(10px);display:none;align-items:center;justify-content:center;z-index:40;padding:16px}
.overlay.show{display:flex}
.modal{width:min(340px,92vw);background:rgba(255,255,255,0.94);backdrop-filter:blur(20px);border:1px solid #fff;border-radius:26px;padding:24px 20px;text-align:center;box-shadow:0 22px 50px rgba(50,110,170,0.26), inset 0 1px 0 #fff}
.modal h2{font-weight:900;letter-spacing:0.08em;font-size:18px}
.modal p{margin:6px 0 16px;color:#5a7296;font-size:13px;line-height:1.5}
.modal button{width:100%;border:0;border-radius:999px;padding:12px;background:linear-gradient(135deg,#00d1ff 0%, #2fff9b 60%, #a8ff53 100%);color:#0f2040;font-weight:900;letter-spacing:0.07em;cursor:pointer;box-shadow:0 6px 16px rgba(0,200,160,0.28), inset 0 1px 0 rgba(255,255,255,0.9)}

/* Credit pill — fixed at the very bottom, centered. */
.credit-pill{
  position:fixed;bottom:max(10px, env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:6px;padding:7px 16px;border-radius:999px;
  font-size:11px;font-weight:800;letter-spacing:0.04em;color:#2a4a6b;
  background:rgba(255,255,255,0.85);backdrop-filter:blur(12px) saturate(1.2);
  border:1px solid rgba(255,255,255,0.95);
  box-shadow:0 6px 16px rgba(90,150,210,0.2), inset 0 1px 0 #fff;
  z-index:50;white-space:nowrap;pointer-events:none;
}
/* On small screens keep the pill centered and clear of
   the dock, never drifting to the side. */
@media (max-width: 480px) {
  .credit-pill{
    left:50%;right:auto;transform:translateX(-50%);
    bottom:max(8px, env(safe-area-inset-bottom));
    font-size:10px;padding:6px 14px;
  }
}