:root {
    --cell-size: 64px; /* 恢复为正常默认尺寸；JS初始化里也会根据实际宽度更新 */
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f8f9fa;
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
    color: #2c3e50;
}

header p {
    font-size: 1.1rem;
    color: #666;
}

.game-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.difficulty-selector {
    display: flex;
    gap: 10px;
}

.difficulty-selector { display: flex; align-items: center; gap: 10px; }
.timer.inline-timer { margin-left: 6px; font-size: 1rem; font-weight: 600; color: #333; }
.difficulty-btn[data-difficulty="hard"] { margin-right: 6px; }

.difficulty-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    background: #007bff;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.9rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.difficulty-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.difficulty-btn.active {
    background: #28a745;
    box-shadow: 0 2px 4px rgba(40, 167, 69, 0.3);
}

.game-info {
    display: flex;
    align-items: center;
    gap: 20px;
    color: white;
}

.timer {
    font-size: 1.2rem;
    font-weight: 600;
}

#new-game-btn, #hint-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    background: #007bff;
    color: white;
    cursor: pointer;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.9rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#new-game-btn:hover, #hint-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.game-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    margin-bottom: 30px;
}

.game-board {
    background: transparent; /* 画布更干净 */
    border-radius: 0;
    padding: 6px;
    box-shadow: none;
    min-height: 400px;
    display: grid;
    gap: 6px; /* 参考图的格间距更大 */
    border: none;
    margin: 0 auto; /* 居中棋盘 */
}

.board-cell {
    border: 1.5px solid transparent;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1; /* 确保格子为正方形 */
    transition: all 0.2s ease;
    cursor: pointer;
    background: transparent;
}

.board-cell.colored { /* 彩色格：仅显示虚线边框，颜色从脚本注入 */
    border-style: dashed;
    background: transparent;
    border-color: currentColor !important; /* 使用脚本注入的颜色 */
}
.board-cell.colored::after { /* 内部同色阴影填充 */
    content: '';
    position: absolute;
    inset: 2px; /* 留出边框空间 */
    border-radius: inherit;
    background: currentColor;
    opacity: 0.10; /* 轻微填充，增强可见度 */
    pointer-events: none;
}

.board-cell.void { /* 白色格移除：完全透明，不可交互 */
    pointer-events: none;
    visibility: visible; /* 仍保留网格占位，形成“空洞”布局 */
    border-color: transparent !important;
}

.board-cell:hover {
    filter: brightness(1.03);
}

.board-cell.occupied {
    background: rgba(0,0,0,0.03);
    border-color: currentColor;
}

/* 棋盘内点数容器和点样式 */
.board-pips {
    position: relative;
    width: 28px;
    height: 28px;
}

.board-pips .pip {
    position: absolute;
    width: 5px;
    height: 5px;
    background: #333;
    border-radius: 50%;
}

.board-cell.drop-target {
    background: rgba(76,175,80,0.06);
    border-color: #4CAF50 !important;
    border-style: dashed;
}

/* 区域条件菱形徽章 */
.region-condition {
    position: absolute;
    right: -10px;
    top: 50%;
    transform: translate(50%, -50%) rotate(45deg);
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 12px;
    border-radius: 4px;
}
.region-condition .label {
    transform: rotate(-45deg);
    display: inline-block;
}
/* 按类型着色（近似参考图）*/
.condition-number { background: #2e7d32; }
.condition-equal { background: #43a047; }
.condition-not-equal { background: #8d6e63; }
.condition-less { background: #1e88e5; }
.condition-greater { background: #e53935; }

/* 右侧面板维持原有设计 */
.dominoes-panel {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin: 0 auto; /* 置于下方并水平居中 */
}

.dominoes-panel h3 {
    margin-bottom: 15px;
    color: #333;
    text-align: center;
}

/* Dominoes panel: simplify to single, soft border and subtle inner shadow */
.dominoes-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    max-height: 400px;
    overflow-y: auto;
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    box-shadow: 0 6px 24px rgba(0,0,0,0.08);
    border: 1px solid rgba(0,0,0,0.06);
}

/* Domino tile: remove stacked borders; use one outline + soft shadow */
.domino {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #fff;
    border: 1px solid rgba(0,0,0,0.12);
    border-radius: 10px;
    padding: 6px;
    cursor: grab;
    transition: box-shadow 0.25s ease, transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
    user-select: none;
    position: relative;
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}
.domino.horizontal {
    width: calc(var(--cell-size) * 2);
    height: var(--cell-size);
    flex-direction: row;
}
.domino.vertical {
    width: var(--cell-size);
    height: calc(var(--cell-size) * 2);
    flex-direction: column;
}

/* Single divider with subtle tone */
.domino-divider {
    background: rgba(0,0,0,0.18);
}
.domino.horizontal .domino-divider { width: 2px; height: 100%; }
.domino.vertical .domino-divider { width: 100%; height: 2px; }

/* Hover/active states - clean and modern */
.domino { /* rotation handled by layout; no transform */ }
.domino:hover { transform: translateY(-2px); }
.domino.dragging { transform: rotate(3deg); }

    box-shadow: 0 8px 18px rgba(0,0,0,0.12);
    border-color: rgba(0,0,0,0.18);
}
.domino:active { cursor: grabbing; }
.domino.dragging { opacity: 0.85; transform: rotate(3deg); z-index: 1000; }
.domino.placed { background: #f5fbf6; border-color: #4CAF50; box-shadow: 0 2px 10px rgba(76,175,80,0.18); }

/* Halves and pips */
.domino-half { flex: 1; width: 100%; height: 100%; display:flex; align-items:center; justify-content:center; }
.pip { width: 6px; height: 6px; background: #333; border-radius: 50%; position: absolute; }

/* Panel heading spacing tweak */
.dominoes-panel h3 { margin-top: 0; margin-bottom: 10px; }

/* Ensure clicks work on domino and its children */
.domino, .domino * { pointer-events: auto; }

/* Remove accidental nested rule inside .domino block */

/* Removed old rotate-indicator to simplify visuals */

/* Hover state and active/dragging already redefined above; remove duplicates */

/* Domino base layout */

/* Remove duplicated .domino-half and .domino-divider blocks below; now defined once above with simplified rules */

.instructions {
    background: rgba(255,255,255,0.95);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.instructions h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 1.3rem;
}

.instructions ul {
    list-style: none;
}

.instructions li {
    margin-bottom: 8px;
    padding-left: 20px;
    position: relative;
}

.instructions li:before {
    content: '•';
    color: #4CAF50;
    font-weight: bold;
    position: absolute;
    left: 0;
}

.condition-item {
    display: flex;
    align-items: center;
    gap: 10px;
}

.condition-number, .condition-equal, .condition-not-equal, 
.condition-less, .condition-greater {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: bold;
    color: white;
    min-width: 30px;
    text-align: center;
}

.condition-number { background: #2196F3; }
.condition-equal { background: #4CAF50; }
.condition-not-equal { background: #FF9800; }
.condition-less { background: #9C27B0; }
.condition-greater { background: #F44336; }

.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background: white;
    margin: 15% auto;
    padding: 30px;
    border-radius: 15px;
    width: 300px;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.modal-content h2 {
    color: #4CAF50;
    margin-bottom: 20px;
}

.modal-content p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

#play-again-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    background: #007bff;
    color: white;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#play-again-btn:hover {
    background: #0056b3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* Enlarge Dominoes panel and make it responsive */
.container { max-width: min(1400px, 96vw); }
.game-area { align-items: stretch; }
.dominoes-panel { width: 100%; }
.dominoes-container { grid-template-columns: repeat(3, minmax(160px, 1fr)); max-height: none; }

/* On larger screens, show more columns */
@media (min-width: 1200px) {
  .dominoes-container { grid-template-columns: repeat(4, minmax(180px, 1fr)); }
}

/* On small screens, make tiles larger and single column */
@media (max-width: 768px) {
  :root { --cell-size: 72px; }
  .dominoes-container { grid-template-columns: repeat(2, minmax(150px, 1fr)); }
}

@media (max-width: 480px) {
  :root { --cell-size: 64px; }
  .dominoes-container { grid-template-columns: 1fr; }
}


@media (max-width: 768px) {
    .game-area {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .game-controls {
        flex-direction: column;
        gap: 15px;
    }
    
    .difficulty-selector {
        justify-content: center;
    }
    
    .dominoes-container {
        grid-template-columns: repeat(3, 1fr);
    }
    
    header h1 {
        font-size: 2rem;
    }
}

/* 动画效果 */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

.domino.placed {
    animation: bounce 0.6s ease;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(76, 175, 80, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(76, 175, 80, 0);
    }
}

.board-cell.valid-placement {
    animation: pulse 1s infinite;
}
/* Hide rotate-indicator entirely if any legacy elements remain */
.rotate-indicator { display: none !important; }
/* Intro section styles */
.hero-intro { margin-top: 10px; text-align: left; }
.hero-intro .tagline { font-size: 1.05rem; color: #444; margin-bottom: 8px; }
.selling-points { list-style: none; padding-left: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 6px 20px; }
.selling-points li { color: #555; }
@media (max-width: 768px) { .selling-points { grid-template-columns: 1fr; } }

}

/* Center timer in controls */
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
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.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto 1fr; column-gap: 16px; align-items: center; margin-bottom: 30px; background: white; padding: 20px; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.game-controls .difficulty-selector { justify-self: start; }
.game-controls .timer { justify-self: center; }
.game-controls .game-info { justify-self: end; }
.game-controls { display: grid; grid-template-columns: 1fr auto