:root {
    /* Material 3 Tonal Palette (M3 Light Theme) */
    --md-sys-color-primary: #000000;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #e0e0e0;
    --md-sys-color-on-primary-container: #000000;
    --md-sys-color-secondary: #5d5e61;
    --md-sys-color-surface: #fdfcff;
    --md-sys-color-on-surface: #1a1c1e;
    --md-sys-color-surface-variant: #e1e2ec;
    --md-sys-color-on-surface-variant: #44474e;
    --md-sys-color-outline: #74777f;
    --md-sys-color-error: #ba1a1a;
    --md-sys-color-error-container: #ffdad6;
    --md-sys-color-on-error-container: #410002;

    /* M3 Surface Container Roles */
    --md-sys-color-surface-container-low: #f7f3f9;
    --md-sys-color-surface-container: #f3eff4;
    --md-sys-color-surface-container-high: #ede9ee;
    --md-sys-color-surface-container-highest: #e7e3e8;
    
    --md-sys-surface-image: none;
    --md-sys-bg-size: auto;
    --font-main: 'Google Sans', 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    font-family: var(--font-main);
    background: var(--md-sys-surface-image) 0 0 / var(--md-sys-bg-size) var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    margin: 0;
    -webkit-font-smoothing: antialiased;
    transition: background 0.4s cubic-bezier(0.4, 0, 0.2, 1), background-image 0.4s ease;
}

header {
    padding: 0.5rem 1.5rem;
    background-color: var(--md-sys-color-surface);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.4s ease, border-color 0.4s ease;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.logo {
    font-weight: 700;
    font-size: 1.35rem;
    text-decoration: none;
    color: var(--md-sys-color-on-surface);
    letter-spacing: -0.02em;
}

.nav-links a {
    margin-left: 0.5rem;
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 500;
    font-size: 0.875rem;
    border-radius: 20px;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.nav-links a:hover {
    background-color: var(--md-sys-color-surface-variant);
    color: var(--md-sys-color-on-surface);
}

.nav-links a .material-symbols-outlined {
    font-size: 20px;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 2rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 400;
    margin: 0 0 0.5rem 0;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 400;
    margin-bottom: 4rem;
}

/* Content Section Styling */
.content-section {
    display: none;
    margin-top: 2rem; 
    padding: 1rem 0;
    background-color: transparent;
    text-align: left;
}

.content-section.is-visible {
    display: block;
}

#about h2, .content-section h2 {
    font-size: 3rem;
    font-weight: 400;
    margin-bottom: 0.5rem;
    color: var(--md-sys-color-on-surface);
}

.content-section p {
    font-size: 1rem;
    line-height: 1.6;
    color: var(--md-sys-color-on-surface-variant);
}

.blog-post {
    margin-bottom: 1rem;
    padding: 1.5rem;
    background-color: var(--md-sys-color-surface-container-low);
    border-radius: 24px;
    transition: all 0.2s ease;
}

.blog-post:hover {
    background-color: var(--md-sys-color-surface-container);
}

.blog-post h3 {
    font-size: 1.4rem;
    font-weight: 500;
    margin: 0 0 0.5rem 0;
    color: var(--md-sys-color-on-surface);
}

.blog-date {
    display: block;
    font-size: 0.8rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 0.75rem;
}

#menu-toggle {
    display: none;
}

.hamburger {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 6px;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--md-sys-color-on-surface);
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
        z-index: 10;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--md-sys-color-surface);
        flex-direction: column;
        padding: 1.5rem 2rem;
        border-bottom: 1px solid var(--md-sys-color-surface-variant);
        text-align: left;
        z-index: 5;
    }

    .nav-links a {
        margin: 1rem 0;
        margin-left: 0;
        font-size: 1.1rem;
    }

    #menu-toggle:checked ~ .nav-links {
        display: flex;
    }

    #menu-toggle:checked ~ .hamburger span:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    #menu-toggle:checked ~ .hamburger span:nth-child(2) {
        opacity: 0;
    }

    #menu-toggle:checked ~ .hamburger span:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    h1 {
        font-size: 3rem;
    }
}

/* Styling for Congress.gov API content */
.congress-item {
    margin-bottom: 0.75rem;
    padding: 1.5rem;
    background-color: var(--md-sys-color-surface-container-low);
    border-radius: 24px;
    transition: all 0.2s ease;
}

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

.congress-item:last-child {
    border-bottom: none;
}
.bill-number {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--md-sys-color-on-surface-variant);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}
.bill-title {
    font-size: 1.25rem;
    font-weight: 500;
    margin: 0.75rem 0;
    line-height: 1.3;
    color: var(--md-sys-color-on-surface);
}
.bill-status-bar {
    margin: 0.5rem 0;
}
.status-label {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 500;
}
.status-label.passed, .status-label.passed-house, .status-label.passed-senate, .status-label.enacted { background: #d7ebd8; color: #1a4d1a; }
.status-label.passed-senate { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.status-label.passed-house { background: var(--md-sys-color-primary-container); color: var(--md-sys-color-on-primary-container); }
.status-label.failed, .status-label.failed-house, .status-label.failed-senate, .status-label.vetoed { background: var(--md-sys-color-error-container); color: var(--md-sys-color-on-error-container); }
.status-label.latest { background: #d0e4ff; color: #004a77; }
.status-label.stalled { background: #fff1cc; color: #664d03; }
.status-label.in-progress { background: var(--md-sys-color-surface-variant); color: var(--md-sys-color-on-surface-variant); }

.bill-tally {
    font-size: 0.85rem;
    color: var(--md-sys-color-on-surface);
    margin: 0.6rem 0;
    padding: 0.6rem;
    background-color: var(--md-sys-color-surface-container-high);
    border-radius: 12px;
    line-height: 1.4;
}

.summary-link {
    font-size: 0.8rem;
    color: var(--md-sys-color-primary);
    text-decoration: none;
    margin-left: 5px;
    font-weight: 500;
}

.summary-link:hover { text-decoration: underline; }

/* Overlay/Modal Styling */
.overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.overlay.is-visible { display: flex; }

.overlay-content {
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    padding: 2.5rem;
    border-radius: 32px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 24px 48px rgba(0,0,0,0.2);
}

.close-overlay {
    position: absolute;
    top: 1rem; right: 1rem;
    background: none; border: none; font-size: 1.5rem; cursor: pointer;
}

.house-filters {
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 1px solid var(--md-sys-color-outline);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    border-radius: 100px;
    font-weight: 500;
    font-size: 0.85rem;
    transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
}

.filter-btn.active {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-color: var(--md-sys-color-primary-container);
}

.filter-btn:hover:not(.active) {
    background-color: var(--md-sys-color-surface-variant);
}

/* Container to keep status label and vote badge cleanly grouped */
.bill-status-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 8px 0;
    flex-wrap: wrap;
}

/* Base Vote Badge look */
.vote-count-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.7rem;
    font-weight: 500;
    padding: 4px 12px;
    border-radius: 12px;
    background-color: var(--md-sys-color-surface-container-highest);
    color: var(--md-sys-color-on-surface-variant);
    border: 1px solid var(--md-sys-color-outline);
}

.summary-trigger-badge {
    display: inline-flex;
    align-items: center;
    font-size: 0.75rem;
    font-weight: 500;
    padding: 4px 16px;
    border-radius: 100px;
    background-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    cursor: pointer;
    transition: opacity 0.2s;
}

.vote-count-badge.voice {
    background-color: var(--md-sys-color-surface);
    font-style: italic;
}

.theme-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 1.5rem;
}

.theme-swatch {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--md-sys-color-outline);
    cursor: pointer;
    transition: transform 0.2s;
}

.theme-swatch:hover { transform: scale(1.1); }