body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
    margin: 0;
    line-height: 1.6;
}

.main-container {
    background: white;
    padding: 40px;
    border-radius: 15px;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

h1 {
    text-align: center;
    color: #155724;
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

h2 {
    text-align: center;
    color: #34495e;
    font-size: 1.3em;
    margin-bottom: 15px;
    font-weight: 500;
}

h3 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 15px;
}

.header-section p {
    text-align: center;
    color: #666;
    margin: 8px 0;
}

.framework-section {
    background: #e8f4f8;
    padding: 20px;
    border-radius: 10px;
    margin: 25px 0;
    border: 2px solid #3498db;
}

.framework-section p {
    margin: 10px 0;
    padding-left: 10px;
}

.sources-section {
    background: #fff9e6;
    padding: 20px;
    border-radius: 10px;
    margin: 25px 0;
    border: 2px solid #f39c12;
}

.sources-section p {
    margin: 8px 0;
    padding-left: 10px;
}

.warning-note {
    background: #ffe5e5;
    padding: 12px;
    border-radius: 5px;
    margin: 15px 0;
    color: #c0392b;
    font-weight: 600;
    border-left: 4px solid #e74c3c;
}

.free-trial-section {
    margin: 25px 0;
}

.trial-box {
    background: #d4edda;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    color: #155724;
    border: 2px solid #c3e6cb;
}

.trial-box p {
    margin: 8px 0;
}

.response-block {
    border: 2px solid #bdc3c7;
    padding: 20px;
    margin: 20px 0;
    min-height: 150px;
    max-height: 500px;
    overflow-y: auto;
    background: #f9f9f9;
    border-radius: 10px;
    font-size: 15px;
}

.input-area {
    margin: 20px 0;
}

input[type="text"],
input[type="password"] {
    padding: 12px;
    margin: 8px 0;
    width: 100%;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 15px;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #3498db;
}

button {
    padding: 12px 25px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 15px;
    width: 100%;
    margin-top: 10px;
    font-weight: 600;
    transition: background 0.3s;
}

button:hover {
    background: #2980b9;
}

button:disabled {
    background: #95a5a6;
    cursor: not-allowed;
}

.premium-section {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 10px;
    margin: 25px 0;
    border: 2px solid #dee2e6;
}

.core-principles-summary {
    background: #f0f8ff;
    padding: 20px;
    border-radius: 10px;
    margin-top: 25px;
    border: 2px solid #3498db;
}

.core-principles-summary p {
    margin: 12px 0;
    padding-left: 10px;
}

.core-principles-summary strong {
    color: #2c3e50;
}

.message {
    padding: 12px;
    margin: 10px 0;
    border-radius: 8px;
    animation: fadeIn 0.3s;
}

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

.user-message {
    background: #e3f2fd;
    border-left: 4px solid #2196F3;
}

.ai-message {
    background: #f5f5f5;
    border-left: 4px solid #4CAF50;
}

.warning-message {
    background: #fff3cd;
    padding: 10px;
    margin: 8px 0;
    font-size: 13px;
    color: #856404;
    border-radius: 6px;
    border: 1px solid #ffeaa7;
}

.error-message {
    background: #f8d7da;
    padding: 10px;
    margin: 8px 0;
    font-size: 13px;
    color: #721c24;
    border-radius: 6px;
    border: 1px solid #f5c6cb;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}