/* ── 变量 ── */
:root {
  --bg:        #080812;
  --surface:   #0e0e1c;
  --surface2:  #14142a;
  --border:    #222240;
  --border2:   #333360;
  --accent:    #6677ff;
  --accent-lo: rgba(102,119,255,0.15);
  --text:      #d0d0f0;
  --text-dim:  #555588;
  --cell-size: 54px;
  --cell-gap:  2px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Courier New', 'Consolas', monospace;
  height: 100vh;
  overflow: hidden;
  user-select: none;
}

/* ── 屏幕切换 ── */
.screen { display: none; }
.screen.active {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  gap: 24px;
  animation: fade-in 0.3s ease;
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── 通用按钮 ── */
button {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 12px 28px;
  font-family: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s, color 0.15s;
}
button:hover:not(:disabled) {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 0 18px rgba(102,119,255,0.5);
}
button:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}
button:active:not(:disabled) {
  transform: scale(0.97);
}

/* ══════════════════════════════════════════
   大厅
══════════════════════════════════════════ */
.logo-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.logo-deco {
  width: 40px;
  height: 40px;
  border: 2px solid var(--accent);
  transform: rotate(45deg);
  margin-bottom: 12px;
  box-shadow: 0 0 24px rgba(102,119,255,0.6), inset 0 0 12px rgba(102,119,255,0.2);
  animation: spin-deco 8s linear infinite;
}
@keyframes spin-deco {
  from { transform: rotate(45deg); }
  to   { transform: rotate(405deg); }
}

#screen-lobby h1 {
  font-size: 2.8rem;
  text-align: center;
  line-height: 1.25;
  letter-spacing: 0.15em;
  color: var(--accent);
  text-shadow: 0 0 32px rgba(102,119,255,0.7);
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.7rem;
  letter-spacing: 0.4em;
}

#lobby-status {
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  min-height: 1.2em;
  text-align: center;
}

/* ══════════════════════════════════════════
   游戏主界面
══════════════════════════════════════════ */
#screen-game {
  padding: 12px 20px;
  gap: 12px;
  justify-content: flex-start;
}

/* 顶部状态条 */
#game-header {
  display: flex;
  align-items: center;
  gap: 32px;
  width: 100%;
  max-width: 800px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

#round-info {
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.15em;
}

#game-status {
  font-size: 0.8rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
}

/* 三栏布局 */
#game-area {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

/* ── 玩家列 ── */
.player-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.col-label {
  display: flex;
  justify-content: space-between;
  width: 100%;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  padding: 0 2px;
}

.col-label b { color: var(--text); }
.score { color: var(--text-dim); }

/* ── 棋盘 ── */
.board {
  display: grid;
  grid-template-columns: repeat(4, var(--cell-size));
  grid-template-rows:    repeat(5, var(--cell-size));
  gap: var(--cell-gap);
  padding: 3px;
  background: var(--border);
  border: 1px solid var(--border2);
  position: relative;
}

.board-cell {
  width:  var(--cell-size);
  height: var(--cell-size);
  background: var(--surface);
  transition: background-color 0.08s;
  cursor: crosshair;
  position: relative;
}

/* 格线纹理 */
.board-cell::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255,255,255,0.03);
  pointer-events: none;
}

.board-readonly .board-cell { cursor: default; }

/* ghost 预览 */
.board-cell.ghost-hover {
  outline: 2px solid rgba(255,255,255,0.45);
  outline-offset: -2px;
  z-index: 1;
}
.board-cell.ghost-placed {
  outline: 2px solid rgba(255,255,255,0.9);
  outline-offset: -2px;
  z-index: 1;
}
.board-cell.ghost-invalid {
  background: rgba(255,60,60,0.35) !important;
  outline: 1px solid rgba(255,60,60,0.7);
  outline-offset: -1px;
}

/* 落子揭晓动画 */
@keyframes reveal {
  0%   { opacity: 0; transform: scale(0.92); }
  60%  { opacity: 1; transform: scale(1.03); }
  100% { opacity: 1; transform: scale(1); }
}
.board.revealing {
  animation: reveal 0.45s ease-out;
}

/* ready 标签 */
.ready-tag {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  min-height: 1.2em;
  color: #00dd88;
  transition: opacity 0.2s;
}

/* ── 中控列 ── */
#ctrl-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  min-width: 190px;
}

/* 方块库 */
#piece-library {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  width: 100%;
}

.piece-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.12s, box-shadow 0.12s;
}
.piece-btn:hover { background: var(--surface2); }
.piece-btn.selected {
  background: var(--surface2);
  border-color: currentColor;
  box-shadow: 0 0 10px currentColor;
}
.piece-btn .label {
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.mini-grid {
  display: grid;
  gap: 1px;
}
.mini-grid div {
  width: 10px;
  height: 10px;
}

/* 预览区 */
#preview-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  padding: 10px;
  background: var(--surface);
  width: 100%;
  min-height: 80px;
  justify-content: center;
}

.preview-title {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  align-self: flex-start;
}

#preview-canvas {
  display: grid;
  gap: 2px;
}
#preview-canvas div {
  width: 20px;
  height: 20px;
}
.no-sel {
  font-size: 0.65rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
}

#rotation-label {
  font-size: 0.62rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  min-height: 1em;
}

/* 操作按钮 */
#ctrl-btns {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}
#ctrl-btns button {
  width: 100%;
  padding: 10px;
  font-size: 0.78rem;
}

#ctrl-status {
  font-size: 0.72rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-align: center;
  min-height: 1.2em;
}

/* ══════════════════════════════════════════
   结算屏
══════════════════════════════════════════ */
#screen-gameover {
  gap: 28px;
}

#result-title {
  font-size: 3.2rem;
  letter-spacing: 0.25em;
  text-shadow: 0 0 36px currentColor;
}
#result-title.win  { color: #00dd88; }
#result-title.lose { color: #ff4455; }
#result-title.draw { color: var(--accent); }

#final-scores {
  display: flex;
  gap: 56px;
  font-size: 1rem;
  color: var(--text-dim);
  letter-spacing: 0.12em;
}
#final-scores b { color: var(--text); }