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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 0;
}

.container {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    max-width: 1400px;
    width: 95%;
    margin: 0 auto;
}

h1 {
    color: #333;
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
}

h2 {
    color: #555;
    font-size: 1.3rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.5rem;
}

.form-section {
    margin-bottom: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #555;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
}

#packageTable {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1rem;
}

#packageTable th,
#packageTable td {
    padding: 0.75rem;
    text-align: left;
    border: 1px solid #ddd;
}

#packageTable th {
    background-color: #667eea;
    color: white;
    font-weight: 600;
}

#packageTable tbody tr:nth-child(even) {
    background-color: #f9f9f9;
}

#packageTable select,
#packageTable input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.9rem;
}

#packageTable select:focus,
#packageTable input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-add,
.btn-remove,
.btn-submit,
.btn-reset {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 5px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-add {
    background-color: #28a745;
    color: white;
}

.btn-add:hover {
    background-color: #218838;
}

.btn-remove {
    background-color: #dc3545;
    color: white;
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
}

.btn-remove:hover {
    background-color: #c82333;
}

.form-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.btn-submit {
    background-color: #667eea;
    color: white;
    padding: 0.8rem 2rem;
}

.btn-submit:hover {
    background-color: #5568d3;
}

.btn-reset {
    background-color: #6c757d;
    color: white;
    padding: 0.8rem 2rem;
}

.btn-reset:hover {
    background-color: #5a6268;
}

.message {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 5px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}