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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: gray;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 600px;
    width: 100%;
    padding: 30px 20px;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header-content h1 {
    font-size: 32px;
    color: #333;
    margin-bottom: 10px;
}

.game-info {
    font-size: 18px;
    color: #666;
    margin-bottom: 20px;
}

#gameNumber {
    font-weight: bold;
    color: #000000;
}

.instructions-section {
    margin-bottom: 20px;
}

.instructions-toggle {
    background: #f0f0f0;
    border: none;
    padding: 12px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    color: #000000;
    transition: all 0.3s ease;
    width: 100%;
}

.instructions-toggle:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

.instructions-content {
    background: #f9f9f9;
    border-left: 4px solid #667eea;
    padding: 15px;
    margin-top: 10px;
    border-radius: 4px;
    font-size: 14px;
    color: #000000;
    line-height: 1.6;
    text-align: left;

    max-height: 16em;
    overflow-y: auto;
    overflow-x: hidden;}

.instructions-content p {
    margin-bottom: 5px;
}

.instructions-content ul {
    margin-left: 20px;
    margin-bottom: 10px;
}

.instructions-content li {
    margin-bottom: 5px;
}

.game-board-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-touch-callout: none;
}

.grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
    background: #ddd;
    padding: 4px;
    border-radius: 8px;
    max-width: 400px;
    width: 100%;
    aspect-ratio: 1;
}

.grid-square {
    aspect-ratio: 1;
    border: 2px solid #000;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background: white;
    border-radius: 4px;
    user-select: none;
    transition: background-color 0.2s ease;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-touch-callout: none;
}

.grid-square.black {
    background: #000;
    cursor: default;
}

.grid-square.white {
    background: white;
}

.grid-square.white:hover {
    background: #f5f5f5;
}

.grid-square.white.drag-over {
    background: #e8f0ff;
    box-shadow: inset 0 0 0 2px #667eea;
}

.grid-square.white.drag-over:active {
    background: #d0e0ff;
}

.game-board-container.drag-over {
    background: rgba(102, 126, 234, 0.1);
    border-radius: 8px;
    outline: 2px dashed #667eea;
}

.tile {
    width: 90%;
    height: 90%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    cursor: grab;
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -webkit-touch-callout: none;
    border-radius: 4px;
    transition: all 0.2s ease;
    /* 3D Effect */
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.25),           /* Drop shadow */
        inset -1px -1px 3px rgba(0, 0, 0, 0.15), /* Bottom-right inner shadow */
        inset 1px 1px 3px rgba(255, 255, 255, 0.5); /* Top-left inner highlight */
    border: 1px solid rgba(0, 0, 0, 0.1);
    transform: translateZ(0);
}

.tile:active {
    cursor: grabbing;

    box-shadow:
        0 2px 4px rgba(0, 0, 0, 0.2),
        inset -0.5px -0.5px 2px rgba(0, 0, 0, 0.1),
        inset 0.5px 0.5px 2px rgba(255, 255, 255, 0.3);
    transform: translateY(2px) translateZ(0);
}

.tile.black-on-white {
    background: linear-gradient(135deg, #ffffff 0%, #f5f5f5 100%);
    color: black;
}

.tile.white-on-red {
    background: linear-gradient(135deg, #ff6b6b 0%, #ff4444 100%);
    color: white;
}

.tile.white-on-green {
    background: linear-gradient(135deg, #66dd66 0%, #44dd44 100%);
    color: white;
}

.tile-rack {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 8px;
    width: 100%;
    max-width: 600px;
    margin-top: 20px;
}

.tile-rack-slot {
    aspect-ratio: 1;
    background: #f0f0f0;
    border: 2px dashed #ccc;
    border-radius: 6px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.tile-rack-slot.centered {
    grid-column: 3 / 4;
    margin-top: 10px;
}

.tile-rack-slot .tile {
    width: 100%;
    height: 100%;
}

.button-bar {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

.game-button {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

#giveUpBtn {
    background: #6b6bff;
    color: white;
}

#giveUpBtn:hover {
    background: #5252ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

#checkBtn {
    background: #6b6bff;
    color: white;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

#checkBtn:hover {
    background: #5252ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.3);
}

#hintBtn {
    background: #6b6bff;
    color: white;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

#hintBtn:hover {
    background: #5252ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(78, 205, 196, 0.3);
}

#shareBtn {
    background: #6b6bff;
    color: white;
}

#shareBtn:hover {
    background: #5252ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.game-button:active {
    transform: translateY(0);
}

/* Mobile Responsive */
@media (max-width: 600px) {
    .container {
        padding: 20px 15px;
    }

    .header-content h1 {
        font-size: 24px;
    }

    .game-info {
        font-size: 16px;
    }

    .grid,
    .tile-rack {
        max-width: 100%;
    }

    .grid-square {
        min-height: 60px;
    }

    .tile {
        font-size: 18px;
    }

    .game-button {
        padding: 10px 20px;
        font-size: 14px;
        min-width: 100px;
    }

    .button-bar {
        gap: 8px;
    }
}

@media (max-width: 400px) {
    .container {
        padding: 15px 10px;
    }

    .header-content h1 {
        font-size: 20px;
    }

    .game-info {
        font-size: 14px;
    }

    .grid {
        gap: 3px;
        padding: 3px;
    }

    .grid-square {
        min-height: 50px;
        border-width: 1px;
    }

    .tile {
        font-size: 16px;
    }

    .tile-rack {
        gap: 6px;
    }

    .tile-rack-slot {
        border-width: 1px;
    }

    .game-button {
        padding: 8px 16px;
        font-size: 12px;
        min-width: 90px;
    }
}

/* Touch-friendly adjustments */
@media (hover: none) and (pointer: coarse) {
    .game-button:active {
        transform: scale(0.98);
    }

    .tile {
        width: 100%;
        height: 100%;
    }
}

@media (hover: hover) and (pointer: fine) {
    .tile:hover {
        box-shadow:
            0 6px 12px rgba(0, 0, 0, 0.3),
            inset -1px -1px 3px rgba(0, 0, 0, 0.15),
            inset 1px 1px 3px rgba(255, 255, 255, 0.5);
        transform: translateY(-1px) translateZ(0);
    }
}

/*toast message for sharing*/
#toast {
  visibility: hidden;
  min-width: 250px;
  background-color: #333;
  color: #fff;
  text-align: center;
  border-radius: 5px;
  padding: 16px;
  position: fixed;
  z-index: 1;
  left: 50%;
  bottom: 30px;
  transform: translateX(-50%);
}

#toast.show {
  visibility: visible;
  animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

@keyframes fadein { from {bottom: 0; opacity: 0;} to {bottom: 30px; opacity: 1;} }
@keyframes fadeout { from {bottom: 30px; opacity: 1;} to {bottom: 0; opacity: 0;} }