:root {
    --primary-color: #2980b9;
    --secondary-color: #2c3e50;
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-color: #333;
    --header-color: #ffffff;
    --tab-inactive: #95a5a6;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
}

body {
    font-family: 'Vazirmatn', sans-serif;
    background-color: var(--background-color);
    margin: 0;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    width: 95%;
    max-width: 1200px;
    height: 90vh;
    background-color: var(--card-background);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.app-header {
    background-color: var(--primary-color);
    color: var(--header-color);
    padding: 15px 25px;
    text-align: center;
    border-bottom: 4px solid var(--secondary-color);
}

.app-header h1 {
    margin: 0;
    font-size: 1.8em;
}

.app-main {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    overflow-y: auto;
}

.tabs {
    display: flex;
    background-color: var(--secondary-color);
    padding: 0 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.tab-link {
    font-family: 'Vazirmatn', sans-serif;
    font-size: 1.1em;
    font-weight: bold;
    padding: 15px 25px;
    cursor: pointer;
    border: none;
    background-color: transparent;
    color: var(--tab-inactive);
    transition: all 0.3s ease;
    border-bottom: 4px solid transparent;
}

.tab-link.active, .tab-link:hover {
    color: var(--header-color);
    border-bottom: 4px solid var(--primary-color);
}

.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.5s;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Card styles */
.card {
    background-color: var(--card-background);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 25px;
}

.card-title {
    font-size: 1.5em;
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 20px;
    text-align: center;
}

/* Form styles */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: bold;
    margin-bottom: 8px;
    font-size: 1.1em;
}

.form-group input, .form-group select {
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-family: 'Vazirmatn', sans-serif;
    font-size: 1em;
    width: 100%;
    box-sizing: border-box;
}

/* Button styles */
.btn {
    font-family: 'Vazirmatn', sans-serif;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}
.btn-primary:hover {
    background-color: #3498db;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-warning {
    background-color: var(--warning-color);
    color: white;
}

.btn-danger {
    background-color: var(--error-color);
    color: white;
}