/* ── CSS Custom Properties ── */
:root {
  --bg:            #f5f5f5;
  --board-bg:      #ffffff;
  --cell-border:   #cccccc;
  --cell-hover:    #d4edda;
  --cell-hover-border: #4caf50;
  --x-color:       #d62828;
  --o-color:       #1a5fa3;
  --last-move:     #ffd700;
  --win-cell:      #ffe066;
  --text:          #222222;
  --text-muted:    #666666;
  --btn-bg:        #dddddd;
  --btn-text:      #222222;
  --btn-hover:     #c8c8c8;
  --score-active:  #e8f4e8;
  --score-border-active: #4caf50;
  --modal-bg:      rgba(255, 255, 255, 0.96);
  --modal-shadow:  rgba(0, 0, 0, 0.2);
  --overlay:       rgba(0, 0, 0, 0.4);
}

body.dark-mode {
  --bg:            #1a1a2e;
  --board-bg:      #16213e;
  --cell-border:   #2a2a4a;
  --cell-hover:    #1a3d2b;
  --cell-hover-border: #2e7d52;
  --x-color:       #ff4d4d;
  --o-color:       #4da6ff;
  --last-move:     #ffc200;
  --win-cell:      #b8860b;
  --text:          #e0e0e0;
  --text-muted:    #9090a0;
  --btn-bg:        #2a2a4a;
  --btn-text:      #e0e0e0;
  --btn-hover:     #3a3a5a;
  --score-active:  #1a2e1a;
  --score-border-active: #2e7d52;
  --modal-bg:      rgba(22, 33, 62, 0.97);
  --modal-shadow:  rgba(0, 0, 0, 0.6);
  --overlay:       rgba(0, 0, 0, 0.65);
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: background 0.3s, color 0.3s;
}

/* ── Header ── */
header {
  width: 100%;
  max-width: 460px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.4rem 1rem 0.6rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

#theme-toggle {
  font-size: 1.4rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: 6px;
  transition: background 0.2s;
}

#theme-toggle:hover {
  background: var(--btn-bg);
}

/* ── Main ── */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  width: 100%;
  max-width: 460px;
}

/* ── Setup Panel ── */
.setup-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
}

.player-setup {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.player-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.player-row input[type="text"] {
  flex: 1;
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  border: 2px solid var(--cell-border);
  background: var(--board-bg);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  transition: border-color 0.2s;
  min-width: 0;
}

.player-row input[type="text"]:focus {
  outline: none;
  border-color: #4caf50;
}

.player-row select {
  padding: 0.4rem 0.7rem;
  border-radius: 6px;
  border: 2px solid var(--cell-border);
  background: var(--board-bg);
  color: var(--text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color 0.2s;
  flex-shrink: 0;
}

.player-row select:focus {
  outline: none;
  border-color: #4caf50;
}

/* ── Labels colored by player ── */
.x-label { color: var(--x-color); }
.o-label { color: var(--o-color); }

/* ── Buttons ── */
button {
  padding: 0.5rem 1.2rem;
  border: none;
  border-radius: 8px;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

button:hover {
  background: var(--btn-hover);
}

button:active {
  transform: scale(0.97);
}

#restart {
  margin-top: 0.2rem;
  padding: 0.5rem 2rem;
}

/* ── Scoreboard ── */
.scoreboard {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  justify-content: center;
}

.score-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 10px;
  border: 2px solid transparent;
  background: var(--board-bg);
  transition: border-color 0.3s, background 0.3s;
  min-width: 110px;
  gap: 0.1rem;
}

.score-card.active {
  border-color: var(--score-border-active);
  background: var(--score-active);
}

.score-header {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.score-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 90px;
}

.score-role {
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.05rem 0.35rem;
  border-radius: 4px;
  background: var(--btn-bg);
  flex-shrink: 0;
}

.score-value {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.score-divider {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ── Status Bar ── */
.status {
  font-size: 1.1rem;
  font-weight: 600;
  min-height: 1.6rem;
  text-align: center;
}

/* ── Game Board ── */
.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 6px;
  background: var(--cell-border);
  border: 6px solid var(--cell-border);
  border-radius: 12px;
  width: 100%;
  max-width: 360px;
  aspect-ratio: 1;
}

.cell {
  background: var(--board-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.4rem;
  font-weight: 800;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
  border-radius: 6px;
  position: relative;
  min-height: 0;
  overflow: hidden;
}

.cell:first-child { border-radius: 8px 0 0 0; }
.cell:nth-child(3) { border-radius: 0 8px 0 0; }
.cell:nth-child(7) { border-radius: 0 0 0 8px; }
.cell:last-child { border-radius: 0 0 8px 0; }

.cell.x { color: var(--x-color); }
.cell.o { color: var(--o-color); }

.cell.last-move {
  background: var(--last-move);
}

.cell.win-cell {
  background: var(--win-cell);
}

.cell.hover-preview {
  background: var(--cell-hover);
  outline: 2px solid var(--cell-hover-border);
  outline-offset: -2px;
}

/* ── Modal ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: fadeIn 0.2s ease;
}

.modal-overlay.hidden {
  display: none;
}

.modal {
  background: var(--modal-bg);
  border-radius: 16px;
  padding: 2.5rem 3rem;
  text-align: center;
  box-shadow: 0 8px 40px var(--modal-shadow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  animation: popIn 0.25s ease;
}

.modal-result {
  font-size: 2.4rem;
  font-weight: 800;
  line-height: 1.1;
}

.modal-result.x-wins { color: var(--x-color); }
.modal-result.o-wins { color: var(--o-color); }
.modal-result.draw   { color: var(--text); }

.modal-sub {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
}

#play-again {
  padding: 0.6rem 2.2rem;
  font-size: 1rem;
  background: #4caf50;
  color: #fff;
}

#play-again:hover {
  background: #43a047;
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes popIn {
  from { transform: scale(0.85); opacity: 0; }
  to   { transform: scale(1);    opacity: 1; }
}

/* ── Responsive ── */
@media (max-width: 400px) {
  header h1 { font-size: 1.4rem; }
  .cell { font-size: 2.6rem; }
  .modal { padding: 2rem 1.5rem; }
  .modal-result { font-size: 2rem; }
}