:root {
    --sidebar-width: 260px;
    --text-main: #1a1a1a;
    --text-muted: #666;
    --border-color: #e5e7eb;
    --bg-hover: #f3f4f6;
    --accent: #2563eb;
}

.page-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
    font-family: 'Inter', sans-serif;
}

/* Sidebar Styling */
.sidebar-group {
    margin-bottom: 32px;
}

.sidebar-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 700;
    margin-bottom: 12px;
    font-family: 'Inter', sans-serif;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: 'Inter', sans-serif;
}

.nav-item i {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.nav-item:hover {
    background-color: var(--bg-hover);
    color: var(--accent);
}

.nav-item:hover i {
    color: var(--accent);
}

/* Right Side Content Grid */
.content-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-main);
}

.series-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Two column list */
    gap: 24px;
}

.series-card {
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
}

.series-category-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--accent);
}

.series-category-title a {
    text-decoration: none;
}


.series-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.series-link {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    text-decoration: none;
    color: var(--text-main);
    font-size: 0.9rem;
    border-bottom: 1px transparent;
    transition: color 0.2s ease;
}

.series-link i,
.series-category-title a i {
    font-size: 0.75rem;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.series-link:hover {
    color: var(--accent);
}

.series-link:hover i,
.series-category-title a:hover i {
    opacity: 1;
    transform: translate(2px, -2px);
}