:root {
  --bg-0: #f6f6f2;
  --bg-1: #ece9dd;
  --ink: #173042;
  --ink-soft: #486173;
  --panel: #ffffffd9;
  --line: #d8d2c0;
  --accent: #186a8a;
  --accent-2: #cc4f35;
  --ghost-ok: #1f9d5570;
  --ghost-bad: #da3b3b80;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Avenir Next", "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--ink);
  background: linear-gradient(140deg, var(--bg-0), var(--bg-1));
  position: relative;
  overflow-x: hidden;
}

.bg-shape {
  position: fixed;
  pointer-events: none;
  filter: blur(0.5px);
  opacity: 0.55;
  z-index: 0;
}

.bg-shape-a {
  width: 38vw;
  min-width: 280px;
  aspect-ratio: 1;
  border-radius: 42% 58% 50% 50% / 55% 43% 57% 45%;
  background: radial-gradient(circle at 30% 30%, #7ab89388, #2f736944);
  right: -9vw;
  top: -9vh;
}

.bg-shape-b {
  width: 34vw;
  min-width: 260px;
  aspect-ratio: 1.2;
  border-radius: 60% 40% 47% 53% / 33% 61% 39% 67%;
  background: radial-gradient(circle at 50% 50%, #efad6f88, #cf6c4f33);
  left: -11vw;
  bottom: -12vh;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1rem 2rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: 0.02em;
}

.hero p {
  margin: 0.35rem 0 0;
  color: var(--ink-soft);
  max-width: 70ch;
}

kbd {
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  padding: 0.1rem 0.35rem;
  font-size: 0.85rem;
  background: #fff;
}

.toolbar {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  backdrop-filter: blur(3px);
}

.control {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-right: 0.45rem;
  padding-right: 0.45rem;
}

.control input {
  width: 110px;
}

button {
  border: 1px solid #11455a33;
  background: linear-gradient(180deg, #e8f4f8, #cde8f1);
  color: #153a4b;
  border-radius: 11px;
  padding: 0.55rem 0.8rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease, background 120ms ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px #0f3f5233;
}

button:active {
  transform: translateY(0);
}

.game-layout {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(280px, 1fr);
  gap: 1rem;
}

.board-panel,
.tray-panel {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  padding: 0.85rem;
}

.board-meta {
  display: grid;
  gap: 0.5rem;
}

.board-meta p {
  margin: 0;
  min-height: 1.2rem;
  color: var(--ink-soft);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  font-size: 0.95rem;
}

.board {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(11, minmax(18px, 1fr));
  border: 1px solid #9caab555;
  border-radius: 8px;
  overflow: hidden;
  width: min(100%, 760px);
}

.board-cell {
  aspect-ratio: 1;
  border: 1px solid #aab7c833;
  background: #faf9f4;
  position: relative;
  transition: background-color 120ms ease, box-shadow 120ms ease;
}

.board-cell.occupied {
  box-shadow: inset 0 0 0 1px #00000012;
}

.board-cell.locked {
  box-shadow: inset 0 0 0 2px #ffffffcc, inset 0 0 0 3px #0000001d;
}

.board-cell.ghost-ok {
  background-image: linear-gradient(135deg, transparent 0 42%, var(--ghost-ok) 42% 58%, transparent 58% 100%);
}

.board-cell.ghost-bad {
  background-image: linear-gradient(135deg, transparent 0 42%, var(--ghost-bad) 42% 58%, transparent 58% 100%);
}

.tray-panel h2 {
  margin: 0.2rem 0 0.65rem;
  font-size: 1.15rem;
}

.piece-tray {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(125px, 1fr));
  gap: 0.55rem;
}

.piece-btn {
  padding: 0.55rem;
  min-height: 98px;
  border-radius: 11px;
  border: 1px solid #2e4f6730;
  background: #f8fbfc;
  display: grid;
  gap: 0.35rem;
  justify-items: start;
  text-align: left;
}

.piece-btn.selected {
  outline: 2px solid var(--accent);
  background: linear-gradient(180deg, #edf8fd, #def2fa);
}

.piece-btn.placed:not(.locked-piece) {
  border-style: dashed;
  opacity: 0.74;
}

.piece-btn.locked-piece {
  background: linear-gradient(180deg, #f9efe8, #f4ddd2);
  border-color: #af6a4f66;
}

.piece-title {
  font-weight: 700;
  font-size: 0.9rem;
}

.piece-mini {
  --u: 12px;
  position: relative;
  width: calc(var(--mw) * var(--u));
  height: calc(var(--mh) * var(--u));
  min-height: 28px;
  min-width: 28px;
}

.mini-cell {
  position: absolute;
  width: calc(var(--u) - 1px);
  height: calc(var(--u) - 1px);
  left: calc(var(--x) * var(--u));
  top: calc(var(--y) * var(--u));
  border-radius: 3px;
  box-shadow: inset 0 0 0 1px #ffffff9d;
}

.piece-state {
  color: var(--ink-soft);
  font-size: 0.8rem;
}

@media (max-width: 900px) {
  .game-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .toolbar {
    gap: 0.45rem;
    padding: 0.6rem;
  }

  button {
    padding: 0.5rem 0.68rem;
    font-size: 0.92rem;
  }

  .piece-tray {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}