:root {
    --primary-color: #2563eb;
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    margin: 0;
    height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: "cv02", "cv03", "cv04", "cv11";
    letter-spacing: -0.01em;
}

.container {
    flex: 1;
    max-width: 1200px;
    width: 95%;
    margin: 1rem auto;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 2rem);
}

.date-range {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.example-questions {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 1rem;
    flex-shrink: 0;
}

.example-questions-header {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.example-questions-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.example-question-button {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
    color: var(--text-color);
    font-family: var(--font-sans);
}

.example-question-button:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.example-question-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.chat-container {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    min-height: 0;
}

.message {
    opacity: 0;
    transform: translateY(10px);
    animation: messageAppear 0.5s ease-out forwards;
    margin-bottom: 1rem;
    padding: 0.75rem;
    border-radius: 8px;
    max-width: 80%;
}

.message-text {
    word-wrap: break-word;
}

.message-text.error-message {
    color: #dc2626;
    background-color: #fee2e2;
    padding: 0.75rem;
    border-radius: 6px;
    border: 1px solid #fecaca;
}

.markdown-content {
    line-height: 1.6;
    font-size: 1rem;
    color: #374151;
}

.markdown-content p {
    margin-bottom: 1rem;
}

.markdown-content h1, 
.markdown-content h2, 
.markdown-content h3, 
.markdown-content h4 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
    line-height: 1.3;
    color: #111827;
}

.markdown-content h1 { font-size: 1.875rem; }
.markdown-content h2 { font-size: 1.5rem; }
.markdown-content h3 { font-size: 1.25rem; }
.markdown-content h4 { font-size: 1.125rem; }

.markdown-content ul,
.markdown-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.markdown-content li {
    margin-bottom: 0.5rem;
}

.markdown-content code {
    background: #f3f4f6;
    padding: 0.2em 0.4em;
    border-radius: 4px;
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
    font-size: 0.875em;
    color: #2563eb;
}

.markdown-content pre {
    background: #f8fafc;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid #e5e7eb;
    margin: 1rem 0;
}

.markdown-content pre code {
    background: none;
    padding: 0;
    color: #374151;
    font-size: 0.875rem;
    line-height: 1.7;
}

.markdown-content blockquote {
    border-left: 4px solid #e5e7eb;
    padding-left: 1rem;
    margin: 1rem 0;
    color: #4b5563;
    font-style: italic;
}

.markdown-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
    font-size: 0.875rem;
}

.markdown-content th,
.markdown-content td {
    border: 1px solid #e5e7eb;
    padding: 0.75rem;
    text-align: left;
}

.markdown-content th {
    background: #f9fafb;
    font-weight: 600;
}

.markdown-content tr:nth-child(even) {
    background: #f9fafb;
}

.markdown-content a {
    color: #2563eb;
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s ease;
}

.markdown-content a:hover {
    border-bottom-color: currentColor;
}

.markdown-content hr {
    border: 0;
    border-top: 1px solid #e5e7eb;
    margin: 2rem 0;
}

.markdown-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.user-message {
    background: var(--primary-color);
    color: white;
    margin-left: auto;
}

.user-message code {
    background: rgba(255, 255, 255, 0.2) !important;
}

.bot-message {
    background: var(--bg-color);
    margin-right: auto;
}

.chat-input {
    display: flex;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.chat-input input {
    flex-grow: 1;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-right: 0.5rem;
    font-size: 1rem;
    font-family: var(--font-sans);
}

.chat-input button {
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    font-family: var(--font-sans);
}

.chat-input button:hover {
    opacity: 0.9;
}

.loading {
    display: inline-block;
    margin-left: 0.5rem;
}

.error {
    color: #dc2626;
    padding: 0.5rem;
    margin-bottom: 1rem;
    background: #fee2e2;
    border-radius: 8px;
}

.loading-message {
    opacity: 0;
    animation: loadingAppear 0.5s ease-out forwards;
}

.loading-message.fade-out {
    animation: loadingFadeOut 0.5s ease-out forwards;
}

.loading-message .message-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-style: italic;
    color: #4b5563;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes messageAppear {
    0% {
        opacity: 0;
        transform: translateY(10px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes loadingAppear {
    0% {
        opacity: 0;
        transform: translateY(5px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes loadingFadeOut {
    0% {
        opacity: 1;
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateY(-5px);
    }
}

@keyframes pulse {
    0% { opacity: 0.7; }
    50% { opacity: 1; }
    100% { opacity: 0.7; }
}

.footer {
    background-color: white;
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    margin-top: auto;
    flex-shrink: 0;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.footer-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-copyright {
    color: #64748b;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .container {
        width: 100%;
        margin: 0;
        height: 100vh;
    }
    
    .date-range,
    .example-questions,
    .chat-container {
        border-radius: 0;
    }
    
    .chat-messages {
        padding: 0.75rem;
    }
    
    .message {
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    .example-questions-list {
        gap: 0.25rem;
    }
    
    .example-question-button {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .chat-input {
        padding: 0.75rem;
    }
    
    .chat-input input {
        padding: 0.5rem;
    }
    
    .chat-input button {
        padding: 0.5rem 1rem;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 1rem 0;
    }

    .footer-content {
        padding: 0 1rem;
    }

    .footer-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
}