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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: #2c3e50;
    color: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand a {
    color: white;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-links a {
    color: #bdc3c7;
    text-decoration: none;
    margin-left: 2rem;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.nav-links a:hover,
.nav-links a.active {
    color: white;
    background: #34495e;
}

/* Container */
.container {
    max-width: 900px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Form Container */
.form-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 2rem;
}

.form-container h1 {
    margin-bottom: 1.5rem;
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
}

/* Sections */
.section {
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f9f9f9;
    border-radius: 6px;
    border-left: 4px solid #3498db;
}

.section h2 {
    font-size: 1.1rem;
    color: #2c3e50;
    margin-bottom: 1rem;
}

/* Form Rows */
.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.form-group {
    flex: 1;
}

.form-group.small {
    flex: 0 0 100px;
}

.form-group.full-width {
    flex: 1 1 100%;
}

/* Labels */
label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.3rem;
    color: #555;
}

/* Inputs */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

/* Buttons */
.button-row {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

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

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

/* Checkbox */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.checkbox-row input[type="checkbox"] {
    width: auto;
}

/* Code/JSON Display */
pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
    font-size: 0.85rem;
    line-height: 1.4;
    max-height: 400px;
}

/* Response Status */
#responseStatus {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    font-weight: bold;
}

#responseStatus.success {
    background: #d4edda;
    color: #155724;
}

#responseStatus.error {
    background: #f8d7da;
    color: #721c24;
}

/* Messages */
.errors {
    background: #f8d7da;
    color: #721c24;
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.warnings {
    background: #fff3cd;
    color: #856404;
    padding: 1rem;
    border-radius: 4px;
}

.errors ul,
.warnings ul {
    margin-left: 1.5rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Scenarios Page */
.scenario-list {
    list-style: none;
}

.scenario-item {
    background: white;
    border-radius: 6px;
    padding: 1rem 1.5rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.scenario-item.invalid {
    border-left: 4px solid #e74c3c;
}

.scenario-item.valid {
    border-left: 4px solid #27ae60;
}

.scenario-info h3 {
    margin-bottom: 0.25rem;
}

.scenario-info p {
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
    }

    .form-group.small {
        flex: 1;
    }

    .button-row {
        flex-direction: column;
    }

    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links a {
        margin-left: 0;
        margin-right: 1rem;
    }
}