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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #1e3c72;
    margin-bottom: 10px;
    font-size: 32px;
}

.subtitle {
    color: #666;
    font-size: 15px;
}

.main-content {
    display: grid;
    grid-template-columns: 380px 1fr;
    gap: 25px;
}

.left-panel,
.right-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.panel-section {
    background: #f8f9fa;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.panel-header h2 {
    font-size: 20px;
    color: #1e3c72;
    margin: 0;
}

.doc-count {
    background: #1e3c72;
    color: white;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.upload-area {
    border: 3px dashed #cbd5e0;
    border-radius: 15px;
    padding: 50px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: white;
}

.upload-area:hover {
    border-color: #1e3c72;
    background: #e8f0fe;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 60, 114, 0.15);
}

.upload-icon {
    font-size: 56px;
    margin-bottom: 15px;
}

.upload-text {
    color: #333;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.upload-hint {
    font-size: 13px;
    color: #666;
}

.document-list {
    max-height: 450px;
    overflow-y: auto;
}

.document-item {
    background: white;
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.document-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.document-info {
    flex: 1;
}

.document-name {
    font-weight: 600;
    color: #333;
    margin-bottom: 8px;
    font-size: 15px;
}

.document-status {
    font-size: 13px;
    color: #666;
    display: flex;
    align-items: center;
    gap: 5px;
}

.document-status.processing {
    color: #f59e0b;
}

.document-status.completed {
    color: #10b981;
}

.delete-btn {
    background: #ef4444;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s;
}

.delete-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
}

.empty-state {
    text-align: center;
    color: #999;
    padding: 60px 30px;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 15px;
}

.empty-state p {
    margin-bottom: 5px;
}

.empty-hint {
    font-size: 13px;
    color: #bbb;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 650px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 25px;
    background: white;
    border-radius: 15px;
    margin-bottom: 20px;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.message {
    margin-bottom: 25px;
    animation: fadeIn 0.3s ease-in;
}

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

.message.user {
    display: flex;
    justify-content: flex-end;
}

.message.bot {
    display: flex;
    justify-content: flex-start;
}

.message-content {
    max-width: 80%;
    padding: 18px;
    border-radius: 15px;
    line-height: 1.7;
    font-size: 15px;
}

.message.user .message-content {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(30, 60, 114, 0.3);
}

.message.bot .message-content {
    background: #f0f0f0;
    color: #333;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.sources {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 2px solid #e0e0e0;
}

.sources-title {
    font-size: 13px;
    color: #666;
    margin-bottom: 8px;
    font-weight: 600;
}

.source-item {
    font-size: 13px;
    color: #1e3c72;
    margin-bottom: 5px;
    padding: 5px 10px;
    background: #e8f0fe;
    border-radius: 6px;
    display: inline-block;
}

.chat-input {
    display: flex;
    gap: 15px;
}

.input-wrapper {
    flex: 1;
    position: relative;
}

.chat-input textarea {
    width: 100%;
    padding: 18px;
    padding-right: 100px;
    border: 2px solid #e0e0e0;
    border-radius: 15px;
    resize: none;
    font-size: 15px;
    font-family: inherit;
    min-height: 80px;
    transition: all 0.3s;
}

.chat-input textarea:focus {
    outline: none;
    border-color: #1e3c72;
    box-shadow: 0 0 0 3px rgba(30, 60, 114, 0.1);
}

.char-count {
    position: absolute;
    bottom: 10px;
    right: 15px;
    font-size: 12px;
    color: #999;
    background: white;
    padding: 3px 8px;
    border-radius: 10px;
}

.send-btn {
    padding: 18px 35px;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    border: none;
    border-radius: 15px;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 4px 12px rgba(30, 60, 114, 0.3);
}

.send-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(30, 60, 114, 0.4);
}

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

.send-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-icon {
    font-size: 18px;
}

.clear-btn {
    background: #f59e0b;
    color: white;
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.3s;
}

.clear-btn:hover {
    background: #d97706;
    transform: scale(1.05);
}

.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 25px;
    background: #333;
    color: white;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    transform: translateX(400px);
    transition: transform 0.3s ease-out;
    z-index: 1000;
    font-weight: 600;
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    background: #10b981;
}

.toast.error {
    background: #ef4444;
}

.toast.info {
    background: #3b82f6;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .chat-container {
        height: 550px;
    }
    
    h1 {
        font-size: 28px;
    }
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 20px;
        border-radius: 15px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .subtitle {
        font-size: 13px;
    }
    
    .panel-section {
        padding: 20px;
    }
    
    .chat-container {
        height: 500px;
    }
    
    .chat-input {
        flex-direction: column;
    }
    
    .send-btn {
        width: 100%;
        justify-content: center;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .upload-icon {
        font-size: 48px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 20px;
    }
    
    .panel-section {
        padding: 15px;
    }
    
    .message-content {
        max-width: 90%;
        font-size: 14px;
        padding: 15px;
    }
    
    .chat-messages {
        padding: 15px;
    }
}