:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f7fa;
    --text-color: #333;
    --border-color: #ddd;
    --hover-color: #3a7bc8;
    --delete-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    padding: 20px;
    background-color: var(--secondary-color);
    color: var(--text-color);
    direction: rtl;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 1rem;
    text-align: center;
    border-radius: 8px;
    margin-bottom: 2rem;
}

main {
    max-width: 1200px;
    margin: 0 auto;
}

#mainContent {
    display: none;
}

body.logged-in #loginScreen {
    display: none;
}

body.logged-in #mainContent {
    display: block;
}

#loginScreen {
    max-width: 300px;
    margin: 100px auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

#loginScreen h2 {
    text-align: center;
    color: var(--primary-color);
}

#loginForm {
    display: flex;
    flex-direction: column;
}

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

#loginForm button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

#loginForm button:hover {
    background-color: var(--hover-color);
}

nav, .company-nav {
    background-color: var(--primary-color);
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

nav button, .company-nav button {
    background-color: transparent;
    color: white;
    border: 1px solid white;
    padding: 8px 16px;
    cursor: pointer;
    margin: 5px;
    border-radius: 4px;
    transition: all 0.3s ease;
}

nav button:hover, .company-nav button:hover {
    background-color: white;
    color: var(--primary-color);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background-color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    overflow: hidden;
}

th, td {
    padding: 12px 15px;
    text-align: right;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
    cursor: pointer;
}

tr:hover {
    background-color: #f0f4f8;
}

.editable:hover {
    background-color: #e3f2fd;
}

#customerForm {
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

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

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-color);
    font-weight: bold;
}

input, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.2);
}

button[type="submit"] {
    width: 100%;
    padding: 12px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

button[type="submit"]:hover {
    background-color: var(--hover-color);
}

.icon-button {
    background: none;
    border: none;
    color: var(--delete-color);
    cursor: pointer;
    font-size: 1.2em;
    transition: all 0.3s ease;
}

.icon-button:hover {
    color: #c0392b;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 300px;
    border-radius: 8px;
    text-align: center;
}

.close {
    color: #aaa;
    float: left;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #000;
    text-decoration: none;
    cursor: pointer;
}

h1, h2 {
    color: var(--primary-color);
    text-align: center;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
}

@media screen and (max-width: 600px) {
    table {
        font-size: 14px;
    }
    
    th, td {
        padding: 8px 10px;
    }
    
    nav button, .company-nav button {
        padding: 6px 12px;
        font-size: 14px;
    }
}