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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    padding: 30px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2em;
}

h2 {
    color: #667eea;
    margin-bottom: 10px;
    font-size: 1.5em;
}

.description {
    color: #666;
    margin-bottom: 25px;
    font-size: 0.95em;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    border-bottom: 2px solid #e0e0e0;
}

.tab-button {
    background: none;
    border: none;
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: all 0.3s ease;
}

.tab-button:hover {
    color: #667eea;
    background-color: #f5f5f5;
}

.tab-button.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 14px;
}

input[type="text"],
select,
textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 14px;
    font-family: 'Monaco', 'Courier New', monospace;
    transition: border-color 0.3s ease;
}

input[type="text"]:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: #667eea;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 14px 30px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    width: 100%;
    margin-bottom: 20px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

/* Result Box */
.result-box {
    position: relative;
}

.result-box textarea {
    background-color: #f8f9fa;
    border-color: #28a745;
}

.btn-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: #667eea;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-copy:hover {
    background-color: #764ba2;
}

.btn-copy:active {
    background-color: #5a3d82;
}

/* Response Container */
.response-container {
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    overflow: hidden;
}

.response-status {
    padding: 12px;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
    font-weight: 600;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 14px;
}

.response-status.success {
    background-color: #d4edda;
    color: #155724;
}

.response-status.error {
    background-color: #f8d7da;
    color: #721c24;
}

.response-tabs {
    display: flex;
    background-color: #f8f9fa;
    border-bottom: 1px solid #e0e0e0;
}

.response-tab-button {
    background: none;
    border: none;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    color: #666;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
}

.response-tab-button:hover {
    color: #667eea;
}

.response-tab-button.active {
    color: #667eea;
    border-bottom-color: #667eea;
    background-color: white;
}

.response-tab-content {
    display: none;
}

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

.response-tab-content textarea {
    border: none;
    border-radius: 0;
    background-color: white;
}

/* Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    background-color: #28a745;
    color: white;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.notification.error {
    background-color: #dc3545;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 1.5em;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-button {
        text-align: left;
        border-bottom: none;
        border-left: 3px solid transparent;
    }

    .tab-button.active {
        border-left-color: #667eea;
        border-bottom-color: transparent;
    }
}