:root {
  --md-primary-fg-color: #3f51b5; /* Indigo 500 */
  --md-primary-fg-color--light: #7986cb; /* Indigo 300 */
  --md-primary-fg-color--dark: #303f9f; /* Indigo 700 */
}

/* Landing Page Hero Section */
.md-content__inner.md-typeset {
    margin-top: 0;
    padding-top: 0;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
    margin-bottom: 2rem;
    color: var(--md-default-fg-color);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--md-primary-fg-color);
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    color: var(--md-default-fg-color--light);
    max-width: 800px;
    margin: 0 auto 2rem;
    line-height: 1.6;
}

.hero .md-button {
    font-size: 1.1rem;
    padding: 0.8rem 1.5rem;
    margin: 0.5rem;
    border-radius: 4px; /* Slightly rounded */
    font-weight: 600;
}

.hero .md-button--primary {
    background-color: var(--md-primary-fg-color);
    color: white;
    border: none;
}

.hero .md-button--primary:hover {
    background-color: var(--md-primary-fg-color--dark);
}

/* Feature Grid (Simple Flexbox for "Why TrainCheck") */
.feature-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}

.feature-item {
    flex: 1 1 300px; /* Min width 300px, grow/shrink */
    max-width: 400px;
    padding: 1.5rem;
    background: var(--md-default-bg-color); /* Match theme bg */
    border: 1px solid var(--md-default-fg-color--lighter);
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 12px rgba(0,0,0,0.1);
}

.feature-item h3 {
    margin-top: 0;
    color: var(--md-primary-fg-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Hide Sidebar on Home Page (controlled by .home-page class on body/main if possible, 
   but mkdocs-material handles 'hide: navigation' frontmatter natively. 
   This styling handles content width centering when sidebar is hidden) */

@media screen and (min-width: 76.25em) {
    .md-content {
        max-width: 100%; /* Use full width for hero */
    }
}