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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 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: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.status-bar {
    background: #f7f9fc;
    padding: 15px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #e2e8f0;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 10px;
}

.status-indicator.ready {
    background: #48bb78;
    animation: pulse 2s infinite;
}

.status-indicator.not-ready {
    background: #f56565;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(72, 187, 120, 0.7); }
    70% { box-shadow: 0 0 0 10px rgba(72, 187, 120, 0); }
    100% { box-shadow: 0 0 0 0 rgba(72, 187, 120, 0); }
}

.stats-btn {
    background: #667eea;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.3s;
}

.stats-btn:hover {
    background: #5a67d8;
}

.init-section, .main-content {
    padding: 30px;
}

.init-section h3, .query-section h3, .results-section h3, .upload-section h3 {
    color: #2d3748;
    margin-bottom: 20px;
    font-size: 1.3em;
}

#apiKeyInput {
    width: 100%;
    padding: 12px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1em;
    margin-bottom: 15px;
}

#initBtn, #submitBtn, #uploadBtn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1em;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

#initBtn:hover, #submitBtn:hover, #uploadBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.input-group {
    margin-bottom: 20px;
}

#queryInput {
    width: 100%;
    padding: 15px;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1em;
    resize: vertical;
    margin-bottom: 15px;
}

#queryInput:focus {
    outline: none;
    border-color: #667eea;
}

.sample-queries {
    margin-top: 20px;
}

.sample-queries p {
    color: #718096;
    margin-bottom: 10px;
}

.sample-btn {
    background: #edf2f7;
    color: #4a5568;
    border: 1px solid #cbd5e0;
    padding: 8px 16px;
    border-radius: 6px;
    margin-right: 10px;
    margin-bottom: 10px;
    cursor: pointer;
    transition: all 0.3s;
}

.sample-btn:hover {
    background: #e2e8f0;
    border-color: #a0aec0;
}

.results-section {
    background: #f7fafc;
    padding: 25px;
    border-radius: 12px;
    margin-top: 25px;
}

.answer-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    line-height: 1.6;
    color: #2d3748;
    margin-bottom: 15px;
}

.metadata {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #e2e8f0;
}

.token-info, .time-info {
    color: #718096;
    font-size: 0.9em;
}

.sources-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #e2e8f0;
}

.sources-section h4 {
    color: #4a5568;
    margin-bottom: 10px;
}

.source-item {
    background: white;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 10px;
    font-size: 0.9em;
    color: #718096;
    border-left: 3px solid #667eea;
}

.upload-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid #e2e8f0;
}

#fileInput {
    margin-right: 15px;
    margin-bottom: 15px;
}

.loading {
    text-align: center;
    padding: 50px;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.stats-modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    width: 80%;
    max-width: 500px;
    position: relative;
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: #aaa;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

#statsContent {
    margin-top: 20px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #e2e8f0;
}

.stat-item:last-child {
    border-bottom: none;
}

.error-message {
    background: #fed7d7;
    color: #9b2c2c;
    padding: 12px;
    border-radius: 8px;
    margin: 15px 0;
}

.success-message {
    background: #c6f6d5;
    color: #22543d;
    padding: 12px;
    border-radius: 8px;
    margin: 15px 0;
}