/* Material Design 3 Tokens */
:root {
    color-scheme: light dark;
    
    /* Light theme */
    --md-sys-color-primary: #FF9900;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #FFEDCC;
    --md-sys-color-on-primary-container: #2D1600;
    --md-sys-color-surface: #FFFBFF;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #F4EFF4;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --md-sys-color-primary: #FFB951;
        --md-sys-color-on-primary: #4A2800;
        --md-sys-color-primary-container: #693C00;
        --md-sys-color-on-primary-container: #FFEDCC;
        --md-sys-color-surface: #141218;
        --md-sys-color-on-surface: #E6E0E9;
        --md-sys-color-surface-variant: #49454F;
        --md-sys-color-on-surface-variant: #CAC4D0;
        --md-sys-color-outline: #938F99;
        --md-sys-color-outline-variant: #49454F;
        --md-sys-color-surface-container: #211F26;
        --md-sys-color-surface-container-high: #2B2930;
    }
}

/* Typography Scale */
.headline-large {
    font-family: 'Roboto', sans-serif;
    font-size: 2rem;
    font-weight: 400;
    line-height: 2.5rem;
    letter-spacing: 0;
}

.headline-small {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 2rem;
    letter-spacing: 0;
}

.title-medium {
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5rem;
    letter-spacing: 0.009375rem;
}

.body-large {
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5rem;
    letter-spacing: 0.03125rem;
}

.body-medium {
    font-family: 'Roboto', sans-serif;
    font-size: 0.875rem;
    font-weight: 400;
    line-height: 1.25rem;
    letter-spacing: 0.015625rem;
}

.body-small {
    font-family: 'Roboto', sans-serif;
    font-size: 0.75rem;
    font-weight: 400;
    line-height: 1rem;
    letter-spacing: 0.025rem;
}

/* Color Classes */
.on-surface-variant {
    color: var(--md-sys-color-on-surface-variant);
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
.header {
    text-align: center;
    padding: 3rem 0;
}

.header h1 {
    margin: 0 0 1rem 0;
    color: var(--md-sys-color-primary);
}

.header p {
    margin: 0;
}

/* Card */
.card {
    background-color: var(--md-sys-color-surface-container);
    border-radius: 0.75rem;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    overflow: hidden;
    transition: background-color 0.2s ease;
}

.card-header {
    padding: 1.5rem;
    background-color: var(--md-sys-color-surface-container-high);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.card-header h2 {
    margin: 0;
    color: var(--md-sys-color-on-surface);
}

/* Demo List */
.demo-list {
    padding: 0;
}

.demo-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem;
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    transition: background-color 0.2s ease;
}

.demo-item:last-child {
    border-bottom: none;
}

.demo-item:hover {
    background-color: var(--md-sys-color-surface-container-high);
}

.demo-content {
    flex: 1;
}

.demo-content h3 {
    margin: 0 0 0.5rem 0;
    color: var(--md-sys-color-on-surface);
}

.demo-content p {
    margin: 0;
}

/* Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.5rem;
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    text-decoration: none;
    border-radius: 1.25rem;
    font-weight: 500;
    font-size: 0.875rem;
    line-height: 1.25rem;
    letter-spacing: 0.00625rem;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: color-mix(in srgb, var(--md-sys-color-primary) 92%, black);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    color: var(--md-sys-color-on-primary);
    text-decoration: none;
}

.btn-primary:focus {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
}

.btn-primary .material-icons {
    font-size: 1.125rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 2rem;
    border-top: 1px solid var(--md-sys-color-outline-variant);
}

.footer p {
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0.5rem;
    }
    
    .header {
        padding: 2rem 0;
    }
    
    .headline-large {
        font-size: 1.75rem;
        line-height: 2.25rem;
    }
    
    .demo-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1rem;
    }
    
    .btn-primary {
        align-self: stretch;
        justify-content: center;
    }
    
    .card-header {
        padding: 1rem;
    }
}