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

body {
    font-family: Arial, sans-serif;
    display: flex;
    height: 100vh;
    overflow: hidden;
    background-color: #f5f5f5;
}

.container {
    display: flex;
    width: 100%;
    position: relative;
}

.sidebar {
    width: 250px;
    height: 100vh;
    background-color: #2c3e50;
    color: white;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.sidebar.collapsed {
    width: 0;
}

.sidebar-content {
    padding: 20px;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .sidebar-content {
    opacity: 0;
}

.logo-placeholder {
    width: 60px;
    height: 60px;
    background-color: #34495e;
    border-radius: 50%;
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: #ecf0f1;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin: 15px 0;
}

.nav-links a {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: #bdc3c7;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s ease;
    font-size: 14px;
}

.nav-links a:hover {
    background-color: #34495e;
    color: white;
    transform: translateX(5px);
}

.nav-links i {
    margin-right: 10px;
    width: 20px;
    text-align: center;
}

.toggle-btn {
    position: absolute;
    top: 20px;
    left: 200px;
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
}

.toggle-btn:hover {
    background-color: #2980b9;
    transform: scale(1.05);
}

.sidebar.collapsed ~ .toggle-btn {
    left: -4px;
}

.content {
    flex: 1;
    padding: 40px;
    margin-left: 20px;
    transition: margin-left 0.3s ease;
}

.sidebar.collapsed ~ .content {
    margin-left: 0;
}

.content h1 {
    color: #2c3e50;
    margin-bottom: 20px;
}

.content p {
    color: #7f8c8d;
    line-height: 1.6;
}

/* Mobile Responsive Styles */
@media screen and (max-width: 768px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        z-index: 1000;
        width: 280px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar:not(.collapsed) {
        transform: translateX(0);
        width: 280px;
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
        width: 280px;
    }

    .toggle-btn {
        position: fixed;
        top: 15px;
        left: 15px;
        padding: 12px;
        font-size: 18px;
        border-radius: 50%;
        width: 50px;
        height: 50px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .sidebar:not(.collapsed) ~ .toggle-btn {
        left: 295px;
    }

    .sidebar.collapsed ~ .toggle-btn {
        left: 15px;
    }

    .content {
        padding: 80px 20px 20px;
        margin-left: 0;
    }

    .nav-links a {
        padding: 15px;
        font-size: 16px;
    }

    .logo-placeholder {
        width: 80px;
        height: 80px;
        font-size: 30px;
    }
}

@media screen and (max-width: 480px) {
    .sidebar {
        width: 100%;
    }

    .sidebar:not(.collapsed) {
        width: 100%;
    }

    .sidebar:not(.collapsed) ~ .toggle-btn {
        left: auto;
        right: 15px;
    }

    .content {
        padding: 70px 15px 15px;
    }

    .nav-links a {
        padding: 18px;
        font-size: 18px;
    }
}

/* Overlay for mobile when sidebar is open */
@media screen and (max-width: 768px) {
    body.sidebar-open::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
    }
}