/* Root Variables */
:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 20px;
}

/* Header */
.header {
    background: var(--surface-color);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.header h1 {
    font-size: 28px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.header p {
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.session-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

#session-id {
    font-size: 14px;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

/* Chat Container */
.chat-container {
    flex: 1;
    background: var(--surface-color);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* Chat Messages */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 80%;
    animation: slideIn 0.3s ease-out;
}

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

.message.user {
    align-self: flex-end;
}

.message.assistant {
    align-self: flex-start;
}

.message-content {
    padding: 16px 20px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.message.user .message-content {
    background: var(--primary-color);
    color: white;
}

.message.assistant .message-content {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.message-content p {
    margin-bottom: 12px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul {
    margin-left: 20px;
    margin-bottom: 12px;
}

.message-content ul li {
    margin-bottom: 8px;
}

.message-content img {
    max-width: 100%;
    border-radius: 8px;
    margin: 12px 0;
}

.message-content strong {
    font-weight: 600;
    color: var(--text-primary);
}

.message-content em {
    font-style: italic;
    color: var(--text-secondary);
}

/* Loading */
.loading {
    padding: 16px 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.loading.hidden {
    display: none;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Input Area */
.input-area {
    padding: 20px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 12px;
}

#user-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    resize: none;
    transition: border-color 0.2s;
}

#user-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Buttons */
button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.btn-primary:disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--surface-color);
    border-color: var(--primary-color);
}

/* Status Bar */
.status-bar {
    margin-top: 16px;
    padding: 12px 20px;
    background: var(--surface-color);
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 14px;
    box-shadow: var(--shadow);
}

#status-text {
    color: var(--text-secondary);
}

#intent-info {
    color: var(--primary-color);
    font-weight: 500;
}

/* Scrollbar */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--bg-color);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 12px;
    }

    .header h1 {
        font-size: 24px;
    }

    .message {
        max-width: 90%;
    }

    .session-info {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }
}