:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #ea4335;
    --background-color: #f8f9fa;
    --text-color: #202124;
    --border-color: #dadce0;
}

.content {
    max-width: 1200px;
    margin: 0 auto;
}

.tips-container {
    background-color: #e8f0fe;
    border-left: 4px solid var(--primary-color);
    padding: 15px;
    margin-bottom: 30px;
    border-radius: 0 4px 4px 0;
}

.demo-section {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}

.demo-box {
    padding: 15px;
    margin: 15px 0;
    background-color: #e0e0e0;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.instructions {
    background-color: #fafafa;
    padding: 15px;
    border-left: 3px solid var(--secondary-color);
    margin-top: 15px;
    font-size: 0.9rem;
}

/* Paint flashing demo */
.paint-demo {
    background-color: #bbdefb;
}

.paint-demo.active {
    background-color: #ffccbc;
}

/* Layout shift demo */
.layout-demo {
    height: 50px;
    transition: height 0.5s ease;
}

.layout-demo.expanded {
    height: 150px;
}

/* Animation demo */
.animation-demo {
    position: relative;
    overflow: hidden;
}

.animation-demo.animated {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        background-color: #bbdefb;
    }

    50% {
        background-color: #90caf9;
    }

    100% {
        background-color: #bbdefb;
    }
}

/* Layer borders demo */
.layer-demo {
    transform: translateZ(0);
    background-color: #c8e6c9;
}

/* Scrolling demo */
.scroll-container {
    width: 100%;
    height: 200px;
    overflow-y: auto;
    border: 1px solid #ccc;
    margin: 15px 0;
}

.scroll-content {
    padding: 15px;
    min-height: 500px;
}

.sticky-elem {
    position: sticky;
    top: 0;
    background-color: #ffecb3;
    padding: 10px;
    z-index: 10;
}

/* Media type demo */
.media-demo {
    background-color: #e1bee7;
    padding: 15px;
}

@media print {
    .media-demo {
        background-color: transparent;
        color: black;
        border: 1px solid black;
    }
}

/* Dark mode demo */
.dark-mode-demo {
    background-color: white;
    color: black;
    padding: 15px;
    transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    .dark-mode-demo {
        background-color: #333;
        color: white;
    }
}

/* Reduced motion demo */
.motion-demo {
    height: 100px;
    position: relative;
    overflow: hidden;
}

.moving-element {
    position: absolute;
    width: 50px;
    height: 50px;
    background-color: #ff9800;
    border-radius: 50%;
    animation: move 3s infinite alternate;
}

@keyframes move {
    0% {
        left: 0;
        top: 0;
    }

    100% {
        left: calc(100% - 50px);
        top: calc(100% - 50px);
    }
}

@media (prefers-reduced-motion: reduce) {
    .moving-element {
        animation: none;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
    }
}

/* Color palette for vision deficiencies */
.color-palette {
    display: flex;
    gap: 10px;
    margin: 15px 0;
}

.color-palette div {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-shadow: 0 0 2px rgba(0, 0, 0, 0.5);
    border-radius: 4px;
}

/* Font demo */
.font-demo {
    margin: 15px 0;
}

.custom-font {
    font-family: 'Arial', sans-serif;
    font-size: 18px;
}

.system-font {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 18px;
}

/* Accessibility features */
.contrast-demo {
    margin: 15px 0;
    padding: 15px;
    background-color: #f5f5f5;
}

.low-contrast {
    color: #aaaaaa;
}

.high-contrast {
    color: #000000;
    font-weight: bold;
}

/* FPS meter style for overlay */
.fps-meter {
    position: fixed;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 5px 10px;
    border-radius: 3px;
    font-family: monospace;
    z-index: 9999;
    display: none;
}

/* Slow element highlighting */
.slow-element {
    background-color: #ffcdd2;
    padding: 15px;
    margin: 15px 0;
}

.slow-element.active {
    animation: expensive-animation 0.5s infinite;
}

@keyframes expensive-animation {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

/* Flexbox and grid highlighting */
.grid-container {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 10px;
    margin: 15px 0;
}

.grid-item {
    background-color: #b3e5fc;
    padding: 20px;
    border-radius: 4px;
    text-align: center;
}

.flex-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin: 15px 0;
}

.flex-item {
    background-color: #dcedc8;
    padding: 20px;
    border-radius: 4px;
    flex: 1;
    min-width: 100px;
    text-align: center;
}

/* Container queries demo */
.container-demo {
    container-type: inline-size;
    resize: horizontal;
    overflow: auto;
    width: 300px;
    border: 1px dashed #999;
    padding: 10px;
    margin: 15px 0;
}

@container (min-width: 400px) {
    .container-content {
        display: flex;
        gap: 10px;
    }
}

.container-content>div {
    background-color: #e1f5fe;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

kbd {
    background-color: #f7f7f7;
    border: 1px solid #ccc;
    border-radius: 3px;
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2);
    color: #333;
    display: inline-block;
    font-size: 0.85em;
    font-weight: 700;
    line-height: 1;
    padding: 2px 4px;
    white-space: nowrap;
}