.container {
    padding: 100px 40px 40px;
}

h1 {
    margin-bottom: 10px;
}

.subtitle {
    color: #7a7a95;
    margin-bottom: 30px;
}

/* GRID */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

/* CARD */
.card {
    background: #16161f;
    border: 1px solid #2a2a38;
    padding: 20px;
    border-radius: 12px;
    color: white;
    transition: 0.2s;
}

.card:hover {
    transform: translateY(-3px);
    border-color: #6c63ff;
}

.chapter-list {
    list-style: none;
    padding: 0;
    margin-top: 20px;
}

.chapter-item {
    padding: 12px 15px;
    border-bottom: 1px solid #ddd;
    display: flex;
    gap: 10px;
    align-items: center;
}

.chapter-number {
    font-weight: bold;
    color: #555;
}

.chapter-link {
    text-decoration: none;
    color: #676767;
    transition: 0.2s;
}

.chapter-link:hover {
    color: #67a6e9;
    padding-left: 5px;
}

.container {
    max-width: 900px;
    margin: auto;
    padding: 20px;
}

/* Tabs */
.tabs {
    margin: 20px 0;
}

.tabs button {
    padding: 10px 15px;
    border: none;
    background: #eee;
    cursor: pointer;
    margin-right: 5px;
}

.tabs button.active {
    background: #007bff;
    color: white;
}