.odpk-app, .odpk-app * { box-sizing: border-box; }
.odpk-app {
  --ink: #1d2b53;
  --sky: #e8f3ff;
  --paper: #ffffff;
  --c0: #ff6b5e; --c0d: #c9483c;
  --c1: #ffc83d; --c1d: #c99a14;
  --c2: #2fc7a0; --c2d: #1a9477;
  --c3: #3d8bff; --c3d: #2565c9;
  --c4: #8a5cf6; --c4d: #6439c9;
  max-width: 760px;
  margin: 1.5rem auto;
  font-family: "Nunito", "Baloo 2", "Arial Rounded MT Bold", "Trebuchet MS", ui-rounded, system-ui, sans-serif;
  color: var(--ink);
  line-height: 1.4;
}
.odpk-card {
  background: var(--sky);
  border: 3px solid var(--ink);
  border-radius: 28px;
  padding: 1.25rem;
  box-shadow: 0 8px 0 var(--ink);
}
.odpk-top { display: flex; align-items: center; justify-content: space-between; gap: .75rem; flex-wrap: wrap; margin-bottom: .9rem; }
.odpk-app .odpk-title { margin: 0; font-size: 1.7rem; font-weight: 900; color: var(--ink); letter-spacing: .01em; }
.odpk-score { display: flex; align-items: center; gap: .5rem; background: var(--paper); border: 2px solid var(--ink); border-radius: 999px; padding: .25rem .8rem; font-weight: 800; }
.odpk-star { color: var(--c1); font-size: 1.3rem; text-shadow: 0 0 0 var(--ink); -webkit-text-stroke: 1px var(--ink); }
.odpk-rank { font-weight: 700; font-size: .85rem; padding-left: .5rem; border-left: 2px solid var(--sky); }

.odpk-sets { display: flex; gap: .45rem; flex-wrap: wrap; margin-bottom: .75rem; }
.odpk-app .odpk-chip {
  display: flex; flex-direction: column; align-items: flex-start; gap: 0;
  background: var(--paper); color: var(--ink); border: 2px solid var(--ink); border-radius: 14px;
  padding: .3rem .7rem; cursor: pointer; font: inherit; line-height: 1.15; text-align: left;
}
.odpk-chip span { font-size: .72rem; font-weight: 600; opacity: .75; }
.odpk-app .odpk-chip[aria-pressed="true"] { background: var(--ink); color: #fff; }

.odpk-tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1rem; }
.odpk-app .odpk-tab {
  background: transparent; color: var(--ink); border: 0; border-bottom: 4px solid transparent;
  font: inherit; font-weight: 800; font-size: 1.05rem; padding: .35rem .6rem; cursor: pointer; border-radius: 6px 6px 0 0;
}
.odpk-app .odpk-tab[aria-selected="true"] { border-bottom-color: var(--c0); }

.odpk-stage {
  position: relative; overflow: hidden; background: var(--paper); border: 2px solid var(--ink);
  border-radius: 20px; padding: 1.25rem 1rem; min-height: 280px; text-align: center;
}
.odpk-grid, .odpk-tiles, .odpk-bank, .odpk-options { display: flex; flex-wrap: wrap; justify-content: center; gap: .7rem; }
.odpk-grid { margin-bottom: 1rem; }

/* Alphabet blocks: the one memorable element */
.odpk-app .odpk-block {
  min-width: 72px; height: 72px; padding: 0 .6rem; cursor: pointer; font: inherit;
  font-size: 2.1rem; font-weight: 900; color: #fff; text-transform: none;
  border: 2px solid var(--ink); border-bottom-width: 7px; border-radius: 16px;
  transition: transform .12s, border-radius .35s;
  text-shadow: 0 2px 0 rgba(0,0,0,.25);
}
.odpk-app .odpk-block.small { min-width: 60px; height: 60px; font-size: 1.7rem; }
.odpk-app .odpk-block:active { transform: translateY(4px); border-bottom-width: 3px; }
.odpk-app .odpk-block:disabled { opacity: .3; cursor: default; transform: none; }
.odpk-block.c0 { background: var(--c0); border-bottom-color: var(--c0d); }
.odpk-block.c1 { background: var(--c1); border-bottom-color: var(--c1d); color: var(--ink); text-shadow: none; }
.odpk-block.c2 { background: var(--c2); border-bottom-color: var(--c2d); }
.odpk-block.c3 { background: var(--c3); border-bottom-color: var(--c3d); }
.odpk-block.c4 { background: var(--c4); border-bottom-color: var(--c4d); }
.odpk-block.on { transform: translateY(-8px) scale(1.12); box-shadow: 0 6px 0 rgba(29,43,83,.25); }

.odpk-tiles { gap: .7rem; transition: gap .4s ease; margin: .5rem 0 1rem; }
.odpk-tiles.joined { gap: 0; }
.odpk-tiles.joined .odpk-block, .odpk-tiles.joined .odpk-slot { border-radius: 0; }
.odpk-tiles.joined > :first-child { border-radius: 16px 0 0 16px; }
.odpk-tiles.joined > :last-child { border-radius: 0 16px 16px 0; }
.odpk-tiles.joined > :only-child { border-radius: 16px; }

.odpk-slot {
  display: inline-flex; align-items: center; justify-content: center; min-width: 72px; height: 72px; padding: 0 .6rem;
  border: 3px dashed var(--ink); border-radius: 16px; font-size: 2.1rem; font-weight: 900; color: var(--ink);
  background: var(--sky); transition: border-radius .35s;
}
.odpk-slot.filled { border-style: solid; background: var(--c1); border-bottom-width: 7px; border-bottom-color: var(--c1d); }
.odpk-bank { margin-bottom: 1rem; padding-top: .5rem; border-top: 2px dotted var(--sky); }

.odpk-pic { font-size: 3.4rem; line-height: 1.1; }
.odpk-pic.big { font-size: 5rem; margin-bottom: .25rem; }
.odpk-detail { border-top: 2px dotted var(--sky); padding-top: .9rem; }
.odpk-line { font-size: 1.3rem; margin: .25rem 0 .8rem; }
.odpk-q { font-size: 1.25rem; font-weight: 800; margin: 0 0 .6rem; }

.odpk-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .6rem; margin: .6rem 0 0; }
.odpk-app .odpk-btn {
  font: inherit; font-weight: 800; font-size: 1.05rem; cursor: pointer; padding: .6rem 1.2rem;
  color: #fff; background: var(--c0); border: 2px solid var(--ink); border-bottom-width: 5px; border-radius: 14px;
}
.odpk-app .odpk-btn.alt { background: var(--c3); }
.odpk-app .odpk-btn.ghost { background: var(--paper); color: var(--ink); }
.odpk-app .odpk-btn:active { transform: translateY(3px); border-bottom-width: 2px; }

.odpk-app .odpk-opt {
  display: flex; flex-direction: column; align-items: center; gap: .1rem; width: 150px; padding: .8rem .5rem;
  font: inherit; color: var(--ink); background: var(--sky); border: 3px solid var(--ink); border-radius: 18px; cursor: pointer;
}
.odpk-opt .odpk-cap { font-weight: 800; font-size: 1.05rem; }
.odpk-app .odpk-opt.right { background: #c9f5e7; border-color: var(--c2d); }

.odpk-msg { min-height: 1.6rem; margin: .8rem 0 0; font-weight: 800; font-size: 1.05rem; text-align: center; }
.odpk-credit { margin: .6rem 0 0; font-size: .8rem; text-align: center; opacity: .8; }
.odpk-credit a { color: inherit; text-decoration: underline; }

.odpk-app button:focus-visible { outline: 4px solid var(--c4); outline-offset: 3px; }

.odpk-shake, .shake { animation: odpk-shake .35s; }
@keyframes odpk-shake { 0%,100% { transform: translateX(0); } 25% { transform: translateX(-7px); } 75% { transform: translateX(7px); } }

.odpk-conf { position: absolute; top: -1.5rem; font-size: 1.6rem; animation: odpk-fall 1.4s ease-in forwards; pointer-events: none; }
@keyframes odpk-fall { to { transform: translateY(340px) rotate(260deg); opacity: 0; } }

@media (max-width: 480px) {
  .odpk-card { padding: .9rem; border-radius: 22px; }
  .odpk-app .odpk-block { min-width: 62px; height: 62px; font-size: 1.8rem; }
  .odpk-slot { min-width: 62px; height: 62px; font-size: 1.8rem; }
  .odpk-app .odpk-opt { width: 30%; min-width: 96px; }
  .odpk-pic { font-size: 2.8rem; }
}
@media (prefers-reduced-motion: reduce) {
  .odpk-app *, .odpk-app *::before { animation: none !important; transition: none !important; }
}