:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #7c3aed;
    --accent: #06d6a0;
    --light: #f8fafc;
    --dark: #1e293b;
    --gray: #64748b;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
}

.app-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.status-indicators {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.status-chip {
    background: var(--light);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-ready { background: var(--success); }
.status-loading { background: var(--warning); }
.status-error { background: var(--error); }

.main-grid {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 24px;
    height: calc(100vh - 200px);
}

.panel {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
}

.panel-header {
    margin-bottom: 20px;
}

.panel-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.panel-subtitle {
    color: var(--gray);
    font-size: 14px;
}

.upload-area {
    border: 2px dashed #cbd5e1;
    border-radius: 16px;
    padding: 40px 20px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 20px;
    background: var(--light);
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.05);
}

.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
    transform: scale(1.02);
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.7;
}

.file-input {
    display: none;
}

.document-list {
    flex: 1;
    overflow-y: auto;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.empty-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.document-item {
    background: white;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    border: 1px solid #e2e8f0;
    transition: all 0.2s ease;
}

.document-item:hover {
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.document-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.document-name {
    font-weight: 600;
    color: var(--dark);
}

.document-meta {
    font-size: 12px;
    color: var(--gray);
}

.document-actions {
    display: flex;
    gap: 8px;
}

.btn {
    padding: 6px 12px;
    border: none;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-danger {
    background: var(--error);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    background: var(--light);
    border-radius: 12px;
    margin-bottom: 20px;
}

.message {
    margin-bottom: 20px;
    max-width: 80%;
}

.user-message {
    margin-left: auto;
}

.message-bubble {
    padding: 16px 20px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.user-message .message-bubble {
    background: var(--primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.ai-message .message-bubble {
    background: white;
    color: var(--dark);
    border-bottom-left-radius: 4px;
    border: 1px solid #e2e8f0;
}

.thinking-indicator {
    display: none;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: white;
    border-radius: 20px;
    margin-bottom: 20px;
    border: 1px solid #e2e8f0;
}

.thinking-indicator.active {
    display: flex;
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.chat-input-area {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    padding: 16px 20px;
    border: 1px solid #e2e8f0;
    border-radius: 20px;
    resize: none;
    font-family: inherit;
    font-size: 14px;
    background: white;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary);
}

.send-btn {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.send-btn:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.send-btn:disabled {
    background: var(--gray);
    cursor: not-allowed;
    transform: none;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    background: white;
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    max-width: 400px;
    width: 90%;
}

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

.progress-bar {
    width: 100%;
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    margin-top: 20px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}

@media (max-width: 1024px) {
    .main-grid {
        grid-template-columns: 1fr;
        height: auto;
    }
    
    .panel:first-child {
        height: 400px;
    }
}