*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(135deg, #eef2f7, #dfe7fd);
    color: #222;
    min-height: 100vh;
}

.page-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem 3rem;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: #111827;
    margin-bottom: 0.75rem;
}

.subtitle {
    max-width: 720px;
    margin: 0 auto;
    font-size: 0.95rem;
    line-height: 1.6;
    color: #4b5563;
}

.card {
    background-color: #ffffff;
    border-radius: 1rem;
    box-shadow:
        0 10px 30px rgba(15, 23, 42, 0.12),
        0 1px 3px rgba(15, 23, 42, 0.08);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.card-header h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #111827;
    margin-bottom: 0.35rem;
}

.card-header p {
    font-size: 0.9rem;
    color: #6b7280;
}

.viz-container {
    position: relative;
    width: 100%;
    /* 16:9 aspect ratio */
    
    overflow: hidden;
    border-radius: 0.75rem;
    background: #f3f4f6;
}

#tableauViz {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

@media (min-width: 768px) {
    .header h1 {
        font-size: 2.4rem;
    }

    .card {
        padding: 2rem;
    }
}