/* === Root Variables === */
:root {
    /* Ocean Blue Palette */
    --deep-ocean: #0A2463;
    --ocean-blue: #1E3A8A;
    --medium-blue: #3B82F6;
    --light-blue: #60A5FA;
    --sky-blue: #DBEAFE;
    
    /* Coral/Warning Accents */
    --coral-red: #FB6F92;
    --sunset-orange: #FF6B35;
    --warning-yellow: #FCD34D;
    
    /* Neutrals */
    --white: #FFFFFF;
    --off-white: #F9FAFB;
    --light-gray: #E5E7EB;
    --medium-gray: #6B7280;
    --dark-gray: #374151;
    --near-black: #1F2937;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Inter', sans-serif;
}

/* === Global Styles === */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* === Container === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === Header/Hero Section === */
.hero {
    background: linear-gradient(135deg, var(--deep-ocean) 0%, var(--ocean-blue) 100%);
    color: var(--white);
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(251, 111, 146, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-top: var(--spacing-sm);
    opacity: 0.9;
}

.tagline {
    font-size: 1.1rem;
    margin-top: var(--spacing-sm);
    opacity: 0.8;
    font-style: italic;
}

.wave-divider {
    height: 60px;
    width: 100%;
    position: absolute;
    bottom: -1px;
    left: 0;
    background: var(--off-white);
    clip-path: polygon(0 50%, 100% 0, 100% 100%, 0 100%);
}

/* === Introduction Section === */
.introduction {
    padding: var(--spacing-xl) var(--spacing-md);
    background-color: var(--white);
}

.introduction h2 {
    color: var(--deep-ocean);
    text-align: center;
}

.introduction p {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    font-size: 1.1rem;
    color: var(--dark-gray);
}

/* === Visualization Sections === */
.visualization-section {
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: var(--off-white);
}

.visualization-section:nth-child(even) {
    background-color: var(--white);
}

.section-header {
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.section-header h2 {
    margin-bottom: 0;
    color: var(--deep-ocean);
}

/* === Visualization Description === */
.viz-description {
    max-width: 800px;
    margin: var(--spacing-md) auto;
    font-size: 1.05rem;
    color: var(--dark-gray);
    text-align: center;
}

/* === Narrative Box === */
.narrative-box {
    background-color: rgba(59, 130, 246, 0.05);
    border-left: 4px solid var(--medium-blue);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: 4px;
}

.narrative-box p {
    color: var(--dark-gray);
    font-size: 1.05rem;
}

.narrative-box p:last-child {
    margin-bottom: 0;
}

/* === Visualization Containers === */
.viz-container {
    background-color: var(--white);
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

/* === Placeholder Styles === */
.viz-placeholder {
    text-align: center;
    color: var(--medium-gray);
}

.placeholder-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    opacity: 0.5;
}

.viz-placeholder p {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
}

.viz-type {
    display: inline-block;
    background-color: var(--sky-blue);
    color: var(--ocean-blue);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

/* === Data Source === */
.legend {
    background-color: var(--white);
    border: 1px solid var(--light-gray);
    border-radius: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.legend h4 {
    font-size: 0.95rem;
    color: var(--dark-gray);
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

.legend-items {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 3px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* === Data Source === */
.data-source {
    font-size: 0.9rem;
    color: var(--medium-gray);
    font-style: italic;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--light-gray);
}

.data-source strong {
    color: var(--dark-gray);
}

/* === Footer === */
footer {
    background-color: var(--deep-ocean);
    color: var(--white);
    padding: var(--spacing-lg) var(--spacing-md);
}

footer .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.team-info h3,
.data-sources h4 {
    color: var(--light-blue);
    margin-bottom: var(--spacing-sm);
}

.team-info p {
    opacity: 0.9;
    line-height: 1.8;
}

.course-info {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    opacity: 0.7;
}

.data-sources ul {
    list-style: none;
}

.data-sources li {
    margin-bottom: var(--spacing-xs);
}

.data-sources a {
    color: var(--light-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

.data-sources a:hover {
    color: var(--white);
    text-decoration: underline;
}

/* === Responsive Design === */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .viz-container {
        min-height: 400px;
    }
}

/* === D3 Visualization Specific Styles === */
.tooltip {
    position: absolute;
    padding: 0.75rem;
    background-color: rgba(31, 41, 55, 0.95);
    color: var(--white);
    border-radius: 6px;
    pointer-events: none;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.tooltip strong {
    color: var(--light-blue);
}

/* Map styles */
.choropleth-wrapper {
    width: min(92vw, 1100px);
    max-width: 1100px;
    height: clamp(360px, 65vh, 640px);
    margin: 0 auto;
    padding: clamp(0.75rem, 2vw, 1.25rem);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Override fixed positioning used by other data-viz blocks in the story page */
.choropleth-wrapper.data-viz {
    position: fixed;
    bottom: 5%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    pointer-events: none;
    z-index: 50;
    margin: 0;
}

#choropleth-map {
    width: 100%;
    height: 100%;
    position: relative;
}

.choropleth-wrapper .viz-container {
    width: 100%;
    height: 100%;
    min-height: 0;
    padding: 0;
    margin: 0;
    border: none;
    box-shadow: none;
    background: transparent;
}

#choropleth-map svg {
    width: 100%;
    height: 100%;
    display: block;
}

.country {
    stroke: var(--white);
    stroke-width: 0.5px;
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.country:hover {
    opacity: 0.8;
    stroke-width: 1.5px;
}

/* Chart axes */
.axis path,
.axis line {
    stroke: var(--light-gray);
    shape-rendering: crispEdges;
}

.axis text {
    fill: var(--dark-gray);
    font-size: 0.85rem;
}

.axis-label {
    fill: var(--near-black);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Area chart styles */
.area {
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.area:hover {
    opacity: 1;
}