:root {
    --bg-color: #f3f4f6;
    --text-color: #1f2937;
    --header-bg: #3b82f6;
    --header-text: #ffffff;
    --tab-active-bg: #2563eb;
    --tab-active-text: #ffffff;
    --tab-inactive-bg: #e5e7eb;
    --tab-inactive-text: #4b5563;
    --content-bg: #ffffff;
    --table-header-bg: #dbeafe;
    --table-header-text: #1e40af;
    --table-border: #d1d5db;
    --table-stripe: #f9fafb;
    --table-hover: #fef3c7;
    --toggle-bg: #ccc;
    --toggle-bg-checked: #2196F3;
}

.dark-mode {
    --bg-color: #111827;
    --text-color: #f3f4f6;
    --header-bg: #1e40af;
    --header-text: #e5e7eb;
    --tab-active-bg: #3b82f6;
    --tab-active-text: #ffffff;
    --tab-inactive-bg: #374151;
    --tab-inactive-text: #d1d5db;
    --content-bg: #1f2937;
    --table-header-bg: #1e3a8a;
    --table-header-text: #bfdbfe;
    --table-border: #4b5563;
    --table-stripe: #2a384d;
    --table-hover: #4d3900;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    font-size: 16px;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

h1 {
    color: var(--header-bg);
    font-size: 2.5em;
    margin: 0 0 10px 0;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.tab {
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    border-radius: 20px;
    background-color: var(--tab-inactive-bg);
    color: var(--tab-inactive-text);
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s, color 0.3s, box-shadow 0.3s;
}

.tab:hover {
    background-color: var(--tab-active-bg);
    color: var(--tab-active-text);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.tab-active {
    background-color: var(--tab-active-bg);
    color: var(--tab-active-text);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.content {
    background-color: var(--content-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.data-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    text-align: left;
}

.data-table th, .data-table td {
    padding: 12px;
    border: 1px solid var(--table-border);
}

.data-table th {
    background-color: var(--table-header-bg);
    color: var(--table-header-text);
    position: sticky;
    top: 0;
}

.data-table tr:nth-child(even) {
    background-color: var(--table-stripe);
}

.data-table tr:hover {
    background-color: var(--table-hover);
}

.error {
    color: #ef4444;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.toggle-container {
    display: flex;
    align-items: center;
    background-color: var(--content-bg);
    padding: 5px 10px;
    border-radius: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.toggle-label {
    margin: 0 10px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-bg);
    transition: .4s;
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--toggle-bg-checked);
}

input:checked + .toggle-slider:before {
    transform: translateX(26px);
}

.mobile-tab-select {
    display: none;
}

.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-form {
    background-color: var(--content-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-form h2 {
    margin-bottom: 1.5rem;
    color: var(--header-bg);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--table-border);
    border-radius: 4px;
    font-size: 1rem;
}

.login-btn {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--tab-active-bg);
    color: var(--tab-active-text);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.login-btn:hover {
    background-color: var(--header-bg);
}

.error-message {
    color: #ef4444;
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
        font-size: 14px;
    }

    .container {
        padding: 0 10px;
    }

    .header {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    h1 {
        font-size: 2em;
        margin-bottom: 15px;
    }
    
    .toggle-container {
        margin-top: 15px;
        margin-bottom: 15px;
    }
    
    .tabs {
        display: none; /* Hide the original tabs on mobile */
    }

    .mobile-tab-select {
        display: block;
        width: 100%;
        padding: 10px;
        font-size: 16px;
        border: 1px solid var(--table-border);
        background-color: var(--content-bg);
        color: var(--text-color);
        border-radius: 5px;
        margin-bottom: 15px;
    }

    .content {
        padding: 15px;
    }

    .data-table th, .data-table td {
        padding: 8px;
    }

    .login-form {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 13px;
    }

    h1 {
        font-size: 1.8em;
    }

    .toggle-switch {
        width: 50px;
        height: 28px;
    }

    .toggle-slider:before {
        height: 22px;
        width: 22px;
        left: 3px;
        bottom: 3px;
    }

    input:checked + .toggle-slider:before {
        transform: translateX(22px);
    }

    .data-table th, .data-table td {
        padding: 6px;
    }
}