:root {
    --aku-primary: #1B5E20;
    --aku-secondary: #388E3C;
    --surface: #FFFFFF;
    --surface-secondary: #FAFAFA;
    --surface-variant: #F5F5F5;
    --outline: #E0E0E0;
    --outline-variant: #EEEEEE;
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-disabled: #BDBDBD;
    --success: #4CAF50;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    background-color: var(--surface-secondary);
    color: var(--text-primary);
    line-height: 1.5;
    font-size: 14px;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    background: var(--surface);
    box-shadow: var(--shadow-md);
}

.header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid var(--outline-variant);
    background: var(--surface);
    flex-shrink: 0;
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo {
    width: 40px;
    height: 40px;
    background: var(--aku-primary);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: 16px;
    flex-shrink: 0;
}

.header-text h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 2px;
}

.header-text p {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 400;
}

.main-content {
    display: flex;
    flex: 1;
    min-height: 0;
}

.chat-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--outline-variant);
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: var(--surface);
}

.chat-container::-webkit-scrollbar {
    width: 6px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--outline);
    border-radius: 3px;
}

.message {
    margin-bottom: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    max-width: 100%;
}

.message.user-message {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 600;
    flex-shrink: 0;
    margin-top: 2px;
}

.ai-message .message-avatar {
    background: var(--aku-primary);
    color: white;
}

.user-message .message-avatar {
    background: var(--outline);
    color: var(--text-secondary);
}

.message-content {
    flex: 1;
    max-width: calc(100% - 40px);
    min-width: 0;
}

.message-bubble {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    position: relative;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    max-width: 100%;
}

.ai-message .message-bubble {
    background: var(--surface-variant);
    color: var(--text-primary);
    border: 1px solid var(--outline-variant);
}

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

.message-bubble p {
    margin: 0 0 var(--spacing-sm) 0;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
}

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

.message-bubble strong {
    font-weight: 600;
}

.message-bubble em {
    font-style: italic;
}

.message-bubble ol {
    margin: var(--spacing-sm) 0;
    padding-left: 20px;
}

.message-bubble ol li {
    margin-bottom: var(--spacing-xs);
    word-wrap: break-word;
    word-break: break-word;
}

.message-bubble pre {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid var(--outline-variant);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    font-size: 13px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message-bubble code {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
    background: rgba(0, 0, 0, 0.08);
    padding: 2px 4px;
    border-radius: 3px;
    font-size: 0.9em;
    word-wrap: break-word;
}

.message-time {
    font-size: 11px;
    color: var(--text-disabled);
    margin-top: var(--spacing-xs);
    padding: 0 var(--spacing-xs);
}

.typing-indicator {
    display: none;
    margin-bottom: var(--spacing-lg);
}

.typing-indicator .message-bubble {
    background: var(--surface-variant);
    border: 1px solid var(--outline-variant);
    width: fit-content;
    padding: var(--spacing-md);
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-disabled);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
    0%, 80%, 100% { opacity: 0.3; }
    40% { opacity: 1; }
}

.input-section {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--outline-variant);
    background: var(--surface);
}

.input-container {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

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

#user-input {
    width: 100%;
    min-height: 44px;
    max-height: 120px;
    padding: 12px var(--spacing-md);
    border: 1px solid var(--outline);
    border-radius: var(--border-radius-lg);
    font-size: 14px;
    font-family: inherit;
    background: var(--surface);
    color: var(--text-primary);
    resize: none;
    transition: var(--transition);
    outline: none;
}

#user-input:focus {
    border-color: var(--aku-primary);
    box-shadow: 0 0 0 3px rgba(27, 94, 32, 0.1);
}

#user-input::placeholder {
    color: var(--text-disabled);
}

#send-button {
    width: 44px;
    height: 44px;
    background: var(--aku-primary);
    border: none;
    border-radius: var(--border-radius);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: var(--transition);
    flex-shrink: 0;
}

#send-button:hover {
    background: var(--aku-secondary);
}

#send-button:disabled {
    background: var(--text-disabled);
    cursor: not-allowed;
}

.loader {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.sidebar {
    width: 280px;
    background: var(--surface-secondary);
    border-left: 1px solid var(--outline-variant);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--outline-variant);
}

.sidebar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.sidebar-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

.sidebar-content {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.quick-actions {
    margin-bottom: var(--spacing-xl);
}

.quick-action {
    display: block;
    width: 100%;
    padding: 12px var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    background: var(--surface);
    border: 1px solid var(--outline-variant);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 13px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.quick-action:hover {
    border-color: var(--aku-primary);
    background: rgba(27, 94, 32, 0.04);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-left: auto;
    font-size: 12px;
    color: var(--text-secondary);
}

.status-dot {
    width: 6px;
    height: 6px;
    background: var(--success);
    border-radius: 50%;
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        height: 100vh;
    }

    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: 200px;
        order: -1;
        border-left: none;
        border-bottom: 1px solid var(--outline-variant);
    }

    .sidebar-content {
        padding: var(--spacing-md);
    }

    .quick-actions {
        display: flex;
        gap: var(--spacing-sm);
        overflow-x: auto;
        margin-bottom: var(--spacing-md);
    }

    .quick-action {
        white-space: nowrap;
        margin-bottom: 0;
        flex-shrink: 0;
    }

    .message-content {
        max-width: calc(100% - 40px);
    }

    .header {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .chat-container, .input-section {
        padding: var(--spacing-md);
    }
}