:root {
    --primary-color: #0056b3;
    --secondary-color: #00a8cc;
    --accent-color: #ff6b6b;
    --text-color: #333;
    --bg-color: #f4f7f6;
    --card-bg: #ffffff;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    --spacing-unit: 1rem;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 0.5em;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

.grid {
    display: grid;
    gap: var(--spacing-unit);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    color: white;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent-color);
    color: white;
    border-radius: 50px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: background-color 0.3s;
    cursor: pointer;
}

.btn:hover {
    background-color: #ff5252;
}

/* Article Styles */
.article-content {
    max-width: 800px;
    margin: 2rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.article-section {
    margin-bottom: 2rem;
}

.article-section h3 {
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
    margin-top: 1.5rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th,
td {
    padding: 0.75rem;
    border-bottom: 1px solid #eee;
    text-align: left;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
}

/* Aspect Ratio for Videos (Tailwind-like) */
.aspect-w-16 {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 */
    height: 0;
    overflow: hidden;
}

.aspect-w-16 iframe,
.aspect-w-16 div {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Responsive */
@media (min-width: 768px) {
    header h1 {
        font-size: 3rem;
    }

    .grid-cols-2 {
        grid-template-columns: repeat(2, 1fr);
    }
}