/* ── Custom properties ── */
:root {
  --grid-size: 12;
  --gap: 2px;
  --cell-size: calc((100vw - 32px - (var(--grid-size) - 1) * var(--gap)) / var(--grid-size));
  --color-bg: #eef4fb;
  --color-header: #4a90e2;
  --color-cell: #ffffff;
  --color-cell-border: #c8ddf5;
  --color-highlight: #ffe066;
  --color-found: #4caf74;
  --color-found-text: #ffffff;
  --color-miss: #ef5350;
  --color-btn-primary: #4a90e2;
  --color-btn-secondary: #e67e22;
  --radius: 6px;
}

@media (min-width: 520px) {
  :root {
    --cell-size: 38px;
  }
}

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
  transition: background 0.6s ease;
}

/* Dark theme for Space category */
body.theme-dark {
  --color-bg: #0f0f2e;
}

body.theme-dark #word-list-section,
body.theme-dark .modal-box {
  background: #1e1e42;
  color: #e8e8ff;
}

body.theme-dark .word-chip {
  background: #2a2a5a;
  border-color: #4a4a8a;
  color: #c8c8ff;
}

body.theme-dark .word-chip.found {
  background: #1a1a3a;
  border-color: #333;
  color: #666;
}

/* ── Background layer ── */
#bg-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.bg-item {
  position: absolute;
  pointer-events: none;
  line-height: 1;
  will-change: transform;
}

@keyframes bg-float {
  0%, 100% { transform: translateY(0px) rotate(var(--rot, 0deg)); }
  50%       { transform: translateY(-20px) rotate(var(--rot, 0deg)); }
}

@keyframes bg-sway {
  0%, 100% { transform: translate(0, 0) rotate(var(--rot, 0deg)); }
  30%       { transform: translate(14px, -12px) rotate(var(--rot, 0deg)); }
  70%       { transform: translate(-10px, -18px) rotate(var(--rot, 0deg)); }
}

@keyframes bg-spin-slow {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ── Header ── */
header {
  position: relative;
  z-index: 1;
  width: 100%;
  background: linear-gradient(135deg, #4a90e2, #7b68ee);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 16px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px rgba(74,144,226,0.3);
}

#timer {
  font-variant-numeric: tabular-nums;
  font-size: 1rem;
  opacity: 0.92;
}

/* ── Main ── */
main {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 520px;
  padding: 12px 16px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

/* ── Grid ── */
#grid-container {
  display: grid;
  grid-template-columns: repeat(var(--grid-size), var(--cell-size));
  grid-template-rows: repeat(var(--grid-size), var(--cell-size));
  gap: var(--gap);
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}

.cell {
  background: var(--color-cell);
  border: 1px solid var(--color-cell-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(11px, calc(var(--cell-size) * 0.57), 16px);
  font-weight: 700;
  color: #334;
  cursor: default;
  transition: background 0.08s, color 0.08s;
  border-radius: 3px;
}

.cell.highlighted {
  background: var(--color-highlight);
  color: #222;
  transform: scale(1.05);
  z-index: 1;
  position: relative;
}

.cell.found {
  background: var(--color-found);
  color: var(--color-found-text);
  border-color: #3a9a5c;
}

.cell.found.highlighted {
  background: var(--color-found);
  color: var(--color-found-text);
}

@keyframes miss-flash {
  0%   { background: var(--color-miss); color: white; }
  100% { background: var(--color-cell); color: #334; }
}

.cell.miss {
  animation: miss-flash 0.4s ease-out forwards;
}

/* ── Word list ── */
#word-list-section {
  width: 100%;
  background: white;
  border-radius: var(--radius);
  padding: 12px 14px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

#word-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
}

.word-chip {
  font-size: 0.85rem;
  font-weight: 700;
  color: #334;
  padding: 4px 8px;
  background: #f0f6ff;
  border: 1.5px solid #c8ddf5;
  border-radius: 20px;
  letter-spacing: 0.05em;
  transition: all 0.2s;
}

.word-chip.found {
  text-decoration: line-through;
  color: #aaa;
  background: #f5f5f5;
  border-color: #ddd;
  opacity: 0.6;
}

/* ── Controls ── */
#controls {
  display: flex;
  gap: 10px;
  width: 100%;
}

#controls button {
  flex: 1;
  padding: 12px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: filter 0.15s, transform 0.1s;
  letter-spacing: 0.02em;
}

#controls button:active {
  transform: scale(0.97);
  filter: brightness(0.9);
}

#btn-new {
  background: var(--color-btn-primary);
  color: white;
}

#btn-category {
  background: var(--color-btn-secondary);
  color: white;
}

/* ── Modal ── */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 110;
  padding: 16px;
}

.modal.hidden {
  display: none;
}

.modal-box {
  background: white;
  border-radius: 16px;
  padding: 24px 20px;
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
}

.modal-box h2 {
  text-align: center;
  color: #334;
  font-size: 1.2rem;
}

#category-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.cat-btn {
  padding: 14px 8px;
  border: 2px solid #c8ddf5;
  border-radius: 10px;
  background: #f0f6ff;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-weight: 700;
  color: #334;
  font-size: 0.85rem;
  transition: all 0.15s;
}

.cat-btn:active {
  background: #4a90e2;
  color: white;
  border-color: #4a90e2;
}

@media (hover: hover) {
  .cat-btn:hover {
    background: #4a90e2;
    color: white;
    border-color: #4a90e2;
  }
}

.cat-btn .cat-emoji {
  font-size: 1.6rem;
  line-height: 1;
}

#btn-close-modal {
  padding: 10px;
  border: 1.5px solid #ddd;
  border-radius: var(--radius);
  background: white;
  color: #888;
  font-size: 0.9rem;
  cursor: pointer;
  font-weight: 600;
}

/* ── Win overlay ── */
#win-overlay {
  position: fixed;
  inset: 0;
  background: rgba(74,144,226,0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 16px;
}

#win-overlay.hidden {
  display: none;
}

@keyframes win-enter {
  from { opacity: 0; transform: scale(0.8) translateY(30px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

#win-box {
  background: white;
  border-radius: 24px;
  padding: 40px 32px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-width: 340px;
  width: 100%;
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
  animation: win-enter 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

#win-trophy {
  font-size: 4rem;
  line-height: 1;
}

#win-heading {
  font-size: 1.5rem;
  color: #334;
  font-weight: 800;
}

#win-time {
  font-size: 1rem;
  color: #666;
}

#btn-play-again {
  margin-top: 8px;
  padding: 14px 32px;
  background: var(--color-btn-primary);
  color: white;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.03em;
  transition: filter 0.15s;
}

@media (hover: hover) {
  #btn-play-again:hover {
    filter: brightness(1.1);
  }
}

/* ── Shared utility ── */
.hidden { display: none !important; }

/* ── Game menu ── */
#game-menu {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 8px 0;
}

#game-menu h2 {
  font-size: 1.3rem;
  font-weight: 800;
  color: #334;
  text-align: center;
}

.game-pick-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 20px;
  background: white;
  border: 2px solid #c8ddf5;
  border-radius: 16px;
  cursor: pointer;
  text-align: left;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: all 0.15s;
}

.game-pick-btn:active {
  background: #4a90e2;
  border-color: #4a90e2;
  color: white;
  transform: scale(0.98);
  box-shadow: 0 4px 16px rgba(74,144,226,0.35);
}

@media (hover: hover) {
  .game-pick-btn:hover {
    background: #4a90e2;
    border-color: #4a90e2;
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(74,144,226,0.35);
  }
}

.pick-emoji {
  font-size: 2.4rem;
  line-height: 1;
  flex-shrink: 0;
}

.pick-label {
  font-size: 1.15rem;
  font-weight: 800;
  display: block;
  color: #334;
}

.game-pick-btn:active .pick-label {
  color: white;
}

@media (hover: hover) {
  .game-pick-btn:hover .pick-label { color: white; }
}

.pick-desc {
  font-size: 0.8rem;
  color: #666;
  font-weight: 500;
  display: block;
  margin-top: 2px;
}

.game-pick-btn:active .pick-desc {
  color: rgba(255,255,255,0.85);
}

@media (hover: hover) {
  .game-pick-btn:hover .pick-desc { color: rgba(255,255,255,0.85); }
}

/* ── Home button in header ── */
#btn-home {
  padding: 6px 12px;
  border: 2px solid rgba(255,255,255,0.5);
  border-radius: 20px;
  background: transparent;
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

@media (hover: hover) {
  #btn-home:hover {
    background: rgba(255,255,255,0.2);
    color: white;
  }
}

/* ── Win score line ── */
#win-score {
  font-size: 1rem;
  color: #666;
}