/* General & Fonts */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    margin: 0;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3 {
    font-weight: 600;
}

/* Navigation */
.top-nav {
    background-color: #f8f9fa;
    padding: 10px 0;
    font-size: 0.9em;
    text-align: right;
    border-bottom: 1px solid #e7e7e7;
}

/* Header */
.main-header {
    background-color: #003366;
    color: #fff;
    padding: 50px 0;
}

.main-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-content {
    flex-basis: 60%;
}

.header-content h1 {
    font-size: 2.8em;
    margin: 0;
}

.header-content .subtitle {
    font-size: 1.2em;
    opacity: 0.9;
    margin: 10px 0 30px;
}

.header-image img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid #00509e;
}

.cta {
    background-color: #ff9900;
    color: #003366;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    display: inline-block;
    transition: background-color 0.3s;
}

.cta:hover {
    background-color: #ffad33;
}

/* Features Section */
.features-overview {
    padding: 60px 0;
    background-color: #f8f9fa;
}

.features-overview h2 {
    text-align: center;
    font-size: 2.2em;
    margin-bottom: 50px;
    color: #003366;
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background-color: #fff;
    border: 1px solid #e7e7e7;
    border-radius: 5px;
    padding: 30px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.card h3 {
    font-size: 1.5em;
    color: #003366;
    margin-top: 0;
}

/* Deep Dive Section */
.deep-dive {
    padding: 60px 0;
}

.deep-dive h2 {
    font-size: 2em;
    color: #003366;
}

.deep-dive ul {
    list-style: none;
    padding: 0;
}

.deep-dive li {
    font-size: 1.1em;
    margin-bottom: 10px;
}

.check-mark {
    color: #28a745;
    font-weight: bold;
    margin-right: 10px;
}

/* About Author & Footer */
.about-author {
    background-color: #f8f9fa;
    padding: 40px 0;
    text-align: center;
}
.about-author h2 {
    color: #003366;
}

.main-footer {
    background-color: #003366;
    color: #fff;
    padding: 20px 0;
    text-align: center;
    font-size: 0.9em;
}

/* Responsive */
@media (max-width: 768px) {
    .main-header .container {
        flex-direction: column;
        text-align: center;
    }
    .header-image {
        margin-top: 30px;
    }
}