:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a2e;
    --bg-hover: #22223a;
    --text-primary: #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted: #555570;
    --border: #2a2a40;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
    --sidebar-width: 280px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

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

.logo-icon {
    font-size: 28px;
}

.logo h1 {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo .subtitle {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 2px;
}

.agent-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.agent-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.15s;
    margin-bottom: 2px;
}

.agent-nav-item:hover {
    background: var(--bg-hover);
}

.agent-nav-item.active {
    background: var(--accent-glow);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.agent-nav-icon {
    font-size: 20px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.agent-nav-info h3 {
    font-size: 13px;
    font-weight: 600;
}

.agent-nav-info p {
    font-size: 11px;
    color: var(--text-muted);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.tech-badge {
    font-size: 11px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Main */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* Welcome */
.welcome {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    overflow-y: auto;
}

.welcome-content {
    max-width: 900px;
    width: 100%;
}

.welcome-content h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.welcome-content > p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 15px;
}

.demo-banner {
    background: linear-gradient(135deg, var(--bg-tertiary), rgba(99, 102, 241, 0.08));
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.demo-banner-icon {
    font-size: 28px;
}

.demo-banner strong {
    display: block;
    font-size: 14px;
    margin-bottom: 2px;
}

.demo-banner p {
    font-size: 12px;
    color: var(--text-secondary);
    margin: 0;
}

.agent-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
}

.agent-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
}

.agent-card:hover {
    border-color: rgba(99, 102, 241, 0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.agent-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.agent-card-icon {
    font-size: 24px;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.agent-card-header h3 {
    font-size: 14px;
    font-weight: 600;
}

.agent-card-header p {
    font-size: 11px;
    color: var(--text-muted);
}

.agent-card-desc {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Chat */
.chat-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.chat-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.chat-header-icon {
    font-size: 24px;
}

.chat-header-info h2 {
    font-size: 15px;
    font-weight: 600;
}

.chat-header-info p {
    font-size: 12px;
    color: var(--text-muted);
}

.chat-header .back-btn {
    margin-left: auto;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 12px;
    transition: all 0.15s;
}

.chat-header .back-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

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

.message {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    line-height: 1.6;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.user {
    align-self: flex-end;
    background: var(--accent);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-bottom-left-radius: 4px;
}

.message.assistant pre {
    background: var(--bg-primary);
    padding: 12px;
    border-radius: var(--radius-sm);
    margin: 8px 0;
    overflow-x: auto;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
}

.message.assistant code {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    background: var(--bg-primary);
    padding: 2px 6px;
    border-radius: 4px;
}

.message.assistant pre code {
    background: none;
    padding: 0;
}

.message.typing::after {
    content: '●●●';
    animation: dots 1.5s infinite;
    letter-spacing: 4px;
}

@keyframes dots {
    0%, 20% { opacity: 0.2; }
    50% { opacity: 1; }
    80%, 100% { opacity: 0.2; }
}

.chat-input-area {
    padding: 16px 24px 24px;
    border-top: 1px solid var(--border);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.sample-prompts {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.sample-prompt {
    font-size: 11px;
    padding: 6px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.sample-prompt:hover {
    background: var(--bg-hover);
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--text-primary);
}

.chat-form {
    display: flex;
    gap: 8px;
    align-items: flex-end;
}

.chat-form textarea {
    flex: 1;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    padding: 12px 16px;
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    resize: none;
    outline: none;
    max-height: 120px;
    transition: border-color 0.15s;
}

.chat-form textarea:focus {
    border-color: var(--accent);
}

.chat-form button {
    background: var(--accent);
    border: none;
    color: white;
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
    flex-shrink: 0;
}

.chat-form button:hover {
    filter: brightness(1.1);
}

.chat-form button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Markdown rendering */
.message.assistant h1, .message.assistant h2, .message.assistant h3 {
    margin: 12px 0 6px;
    font-weight: 600;
}
.message.assistant h1 { font-size: 18px; }
.message.assistant h2 { font-size: 16px; }
.message.assistant h3 { font-size: 14px; }
.message.assistant ul, .message.assistant ol {
    padding-left: 20px;
    margin: 6px 0;
}
.message.assistant li { margin: 4px 0; }
.message.assistant p { margin: 6px 0; }
.message.assistant table {
    border-collapse: collapse;
    width: 100%;
    margin: 8px 0;
    font-size: 12px;
}
.message.assistant th, .message.assistant td {
    border: 1px solid var(--border);
    padding: 6px 10px;
    text-align: left;
}
.message.assistant th {
    background: var(--bg-primary);
    font-weight: 600;
}
.message.assistant blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 12px;
    color: var(--text-secondary);
    margin: 8px 0;
}
.message.assistant a {
    color: var(--accent);
    text-decoration: none;
}
.message.assistant a:hover { text-decoration: underline; }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .agent-grid { grid-template-columns: 1fr; }
}