:root {
    --bg-color: #0d0d0f;
    --grid-bg: #161619;
    --text-color: #e8e8ea;
    --text-secondary: #9ca3af;
    --accent-color: #6366f1;
    --glass-bg: rgba(22, 22, 25, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'SF Pro Display', 'Helvetica Neue', sans-serif;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    display: flex;
    justify-content: center;
    align-items: center;
}

.game-container {
    position: relative;
    display: flex;
    gap: 24px;
    padding: 24px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px);
}

canvas {
    background-color: var(--grid-bg);
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

#next-canvas {
    background: none;
    box-shadow: none;
    border-radius: 0;
    display: block;
    margin: 0 auto;
}

.ui-overlay {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 150px;
}

.score-board,
.level-board,
.next-piece,
.options,
.controls-info,
.debug-info {
    background: rgba(22, 22, 25, 0.5);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.score-label,
.label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.score-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-color);
    line-height: 1;
}

.controls-info p {
    margin: 6px 0;
    font-size: 0.8rem;
    color: var(--text-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.controls-info span {
    color: var(--accent-color);
    font-weight: 600;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    font-size: 0.75rem;
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
}

.debug-info p {
    margin: 4px 0;
    font-size: 0.7rem;
    font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
    color: var(--text-secondary);
}

.debug-info span {
    color: var(--accent-color);
}

.modal {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 13, 15, 0.92);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 10;
    border-radius: 12px;
    backdrop-filter: blur(8px);
}

.modal.hidden {
    display: none;
}

.modal h1 {
    font-size: 3rem;
    margin: 0 0 16px 0;
    color: var(--text-color);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.modal p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* Custom Checkbox Styling */
.checkbox-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-direction: row-reverse;
    position: relative;
    padding-left: 28px;
    padding-right: 0;
    margin-bottom: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    color: var(--text-color);
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    height: 16px;
    width: 16px;
    background-color: rgba(255, 255, 255, 0.05);
    border: 1.5px solid var(--glass-border);
    border-radius: 3px;
    transition: all 0.2s ease;
}

.checkbox-container:hover input~.checkmark {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.12);
}

.checkbox-container input:checked~.checkmark {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked~.checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 5px;
    top: 2px;
    width: 3px;
    height: 7px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}