/* --- General & Variables --- */
:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #343a40;
    --heading-color: #212529;
    --white-color: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--white-color);
}

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

h1, h2, h3 {
    color: var(--heading-color);
    font-weight: 600;
}

h2 {
    text-align: center;
    font-size: 2.2em;
    margin-bottom: 40px;
}

section {
    padding: 60px 0;
}

/* --- Header & Navigation --- */
.site-header {
    background: var(--white-color);
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--primary-color);
}

.main-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    align-items: center;
}

.main-nav li {
    margin-left: 25px;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.nav-button-primary, .nav-button-secondary {
    padding: 8px 18px;
    border-radius: 5px;
    color: var(--white-color);
    text-align: center;
}

.nav-button-primary {
    background-color: var(--primary-color);
    transition: background-color 0.3s ease;
}
.nav-button-primary:hover {
    background-color: #0056b3;
    color: var(--white-color);
}

.nav-button-secondary {
    background-color: var(--secondary-color);
    transition: background-color 0.3s ease;
}
.nav-button-secondary:hover {
    background-color: #5a6268;
    color: var(--white-color);
}


/* --- Hero Section --- */
.hero-section {
    background-color: var(--background-color);
    text-align: center;
    padding: 80px 0;
}

.hero-section h1 {
    font-size: 3em;
    margin-bottom: 15px;
}

.hero-section p {
    font-size: 1.2em;
    max-width: 600px;
    margin: 0 auto 30px auto;
    color: #6c757d;
}

.hero-button {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white-color);
    padding: 15px 30px;
    font-size: 1.1em;
    font-weight: 500;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.hero-button:hover {
    background-color: #0056b3;
    transform: translateY(-2px);
}

/* --- Features Section --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--white-color);
    padding: 30px;
    text-align: center;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    border: 1px solid #e9ecef;
}

.feature-card h3 {
    margin-top: 0;
    font-size: 1.5em;
}

/* --- About Section --- */
.about-section {
    background-color: var(--background-color);
}
.about-section .container {
    max-width: 800px;
    text-align: center;
}

/* --- Footer --- */
.site-footer {
    background-color: var(--heading-color);
    color: #ced4da;
    text-align: center;
    padding: 30px 0;
}
.site-footer p {
    margin: 5px 0;
    color: #ced4da;
}
.site-footer a {
    color: var(--white-color);
    text-decoration: none;
}
.site-footer a:hover {
    text-decoration: underline;
}

/* --- Responsive --- */
@media (max-width: 768px) {
    .main-nav {
        display: none; /* Simple hiding for mobile, can be replaced with a hamburger menu */
    }
    .hero-section h1 {
        font-size: 2.2em;
    }
}