:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --background-color: #f5f6fa;
    --sidebar-width: 250px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Cairo', sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
}

.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar Styles */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--primary-color);
    color: white;
    padding: 20px 0;
    position: fixed;
    height: 100vh;
    right: 0;
}

.logo {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

nav ul {
    list-style: none;
    padding: 20px 0;
}

nav ul li {
    padding: 10px 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    display: block;
    padding: 10px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

nav ul li a:hover {
    background-color: var(--accent-color);
}

/* Main Content Styles */
.main-content {
    flex: 1;
    padding: 20px;
    margin-right: var(--sidebar-width);
}

.section {
    background: white;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: none;
}

.section.active {
    display: block;
}

.section h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

/* Form Styles */
.data-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-color);
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.form-group textarea {
    height: 100px;
    resize: vertical;
}

.form-buttons {
    grid-column: 1 / -1;
    display: flex;
    gap: 10px;
    justify-content: flex-start;
    margin-top: 20px;
}

button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: #2980b9;
}

#exportSheet {
    background-color: #27ae60;
}

#exportSheet:hover {
    background-color: #219a52;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }
    
    .main-content {
        margin-right: 0;
        padding: 20px;
    }
    
    .data-form {
        grid-template-columns: 1fr;
    }
}

/* Authentication Styles */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
}

.auth-box {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.auth-box h2 {
    color: var(--primary-color);
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.auth-form .form-buttons {
    margin-top: 30px;
}

.auth-form button {
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

.auth-links {
    text-align: center;
    margin-top: 20px;
}

.auth-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 14px;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Table Styles */
.section-header {
    margin-bottom: 20px;
    display: flex;
    gap: 10px;
    align-items: center;
}

.add-button {
    background-color: #27ae60;
    padding: 10px 20px;
}

.add-button:hover {
    background-color: #219a52;
}

.export-button {
    background-color: #3498db;
    padding: 10px 20px;
}

.export-button:hover {
    background-color: #2980b9;
}

.table-container {
    overflow-x: auto;
    margin-bottom: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    background-color: white;
}

th, td {
    padding: 12px 15px;
    text-align: right;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: #f8f9fa;
}

tr:hover {
    background-color: #f5f5f5;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 20px;
    border-radius: 10px;
    width: 90%;
    max-width: 800px;
    position: relative;
    max-height: 90vh;
    overflow-y: auto;
}

.close {
    position: absolute;
    left: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

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

.modal h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-color);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 5px;
    justify-content: center;
}

.edit-btn, .delete-btn {
    padding: 5px 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    color: white;
    transition: background-color 0.3s ease;
}

.edit-btn {
    background-color: #3498db;
}

.edit-btn:hover {
    background-color: #2980b9;
}

.delete-btn {
    background-color: #e74c3c;
}

.delete-btn:hover {
    background-color: #c0392b;
}