/* General Reset & Body Styles */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: #f0f2f5;
    overflow: hidden; /* Prevent scrolling on the main page */
}

.page-wrapper {
    display: flex;
    height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 260px;
    background-color: #ffffff;
    border-right: 1px solid #e0e0e0;
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    box-shadow: 2px 0 15px rgba(0,0,0,0.05);
    flex-shrink: 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: #333;
    padding: 0 1.5rem 1.5rem 1.5rem;
    border-bottom: 1px solid #e0e0e0;
}

.main-nav {
    padding: 1rem 0;
}

.main-nav ul {
    list-style: none;
}

.main-nav ul li a {
    display: flex;
    align-items: center;
    padding: 0.9rem 1.5rem;
    text-decoration: none;
    color: #555;
    font-weight: 600;
    transition: all 0.3s ease;
    margin: 0.25rem 1rem;
    border-radius: 8px;
}

.main-nav ul li a:hover {
    background-color: #f0f2f5;
    color: #667eea;
}

.main-nav ul li.active a {
    background-color: #667eea;
    color: #ffffff;
    box-shadow: 0 4px 10px rgba(102, 126, 234, 0.3);
}

.main-nav ul li a i {
    font-size: 1.2rem;
    margin-right: 1rem;
    width: 20px;
    text-align: center;
}

/* Main Content Iframe */
.content-frame {
    flex-grow: 1;
    height: 100vh;
}

.content-frame iframe {
    width: 100%;
    height: 100%;
    border: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    .logo {
        padding: 0 1rem 1.5rem 1rem;
        text-align: center;
        font-size: 1.5rem;
    }
    .main-nav ul li a {
        justify-content: center;
        margin: 0.25rem 0.5rem;
    }
    .main-nav ul li a span {
        display: none;
    }
    .main-nav ul li a i {
        margin-right: 0;
    }
}