/* Light Theme (default) */
:root {
    --header-bg: #4CAF50;
    --sidebar-bg: #f0f0f0;
    --main-bg: #fff;
    --footer-bg: #4CAF50;
    --text-color: black;
    --link-color: #4CAF50;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

/* Layout */
.container {
    display: grid;
    grid-template-areas:
        "header header"
        "sidebar main"
        "footer footer";
    grid-template-columns: 200px 1fr;
    grid-template-rows: auto 1fr auto;
    /* Removed height: 100vh for better responsiveness */
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.header {
    grid-area: header;
    padding: 1rem;
    background: var(--header-bg);
    color: var(--text-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.sidebar {
    grid-area: sidebar;
    padding: 1rem;
    background: var(--sidebar-bg);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
}

.sidebar a {
    color: var(--link-color);
    text-decoration: none;
    display: block;
    padding: 0.5rem 0;
    border-radius: 4px;
}

.sidebar a:hover {
    color: var(--link-color);
    background: rgba(0, 0, 0, 0.1);
}

.main-content {
    grid-area: main;
    padding: 1rem;
    background: var(--main-bg);
    color: var(--text-color);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    border-radius: 5px;
}

.footer {
    grid-area: footer;
    padding: 0.5rem;
    text-align: center;
    background: var(--footer-bg);
    color: var(--text-color);
    box-shadow: 0 -2px 5px rgba(0, 0, 0, 0.1);
    font-size: 0.9rem;
}

/* Theme Toggle Styles */
#theme-toggle {
    display: none;
}

.theme-label {
    display: inline-block;
    padding: 0.5rem 1rem;
    cursor: pointer;
    background: #ccc;
    margin: 0.5rem;
    border-radius: 5px;
    border: 1px solid #999;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-label:hover {
    background: #bbb;
    color: black;
}

.theme-label.dark {
    background: #555;
    color: white;
}

.theme-label.light {
    background: #ccc;
    color: black;
}

/* Dark Theme */
#theme-toggle:checked ~ .container {
    --header-bg: #333;
    --sidebar-bg: #222;
    --main-bg: #111;
    --footer-bg: #333;
    --text-color: white;
    --link-color: #90caf9;
}

/* =========================
   Responsive Design
   ========================= */
@media (max-width: 1024px) {
    .container {
        grid-template-columns: 180px 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        grid-template-areas:
            "header"
            "sidebar"
            "main"
            "footer";
        grid-template-columns: 1fr;
        grid-template-rows: auto auto 1fr auto;
    }

    .sidebar {
        display: block;
        width: 100%;
        padding: 0.8rem;
    }

    .theme-label {
        display: block;
        text-align: center;
        width: fit-content;
        margin: 0.5rem auto;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.2rem;
    }

    .main-content h2 {
        font-size: 1rem;
    }

    .main-content p {
        font-size: 0.9rem;
    }

    .sidebar a {
        padding: 0.3rem 0;
        font-size: 0.9rem;
    }
}