:root {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #8b5cf6;
    --bg-dark: #0a0a0b;
    --bg-elevated: #19191c;
    --bg-card: #1f1f23;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --border: #2a2a2e;
    --success: #10b981;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
}

.nav {
    background: rgba(10, 10, 11, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 18px;
    color: var(--text-primary);
    text-decoration: none;
}

.brand-icon {
    font-size: 24px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 24px;
}

.hero {
    text-align: center;
    margin-bottom: 48px;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 18px;
}

.main-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 24px;
    margin-bottom: 24px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}

.card h2 {
    font-size: 20px;
    margin-bottom: 20px;
}

.upload-area {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.05);
}

.upload-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.text-sm {
    font-size: 14px;
    color: var(--text-muted);
}

.text-muted {
    color: var(--text-muted);
}

.docs-list {
    min-height: 200px;
}

.doc-item {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.doc-name {
    font-weight: 500;
}

.doc-size {
    font-size: 12px;
    color: var(--text-muted);
}

.chat-card {
    display: flex;
    flex-direction: column;
    height: 600px;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    margin-bottom: 20px;
    padding-right: 8px;
}

.message {
    margin-bottom: 16px;
    display: flex;
    gap: 12px;
}

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

.message-content {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    max-width: 80%;
}

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

.chat-input {
    display: flex;
    gap: 12px;
}

.chat-input input {
    flex: 1;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: inherit;
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary);
}

.chat-input button {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 24px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.chat-input button:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.quick-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.action-btn {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.action-btn:hover:not(:disabled) {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.action-btn span {
    font-size: 24px;
}

.status-banner {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 24px;
    text-align: center;
    color: var(--text-secondary);
}

.status-banner strong {
    color: var(--primary);
}

@media (max-width: 968px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 36px;
    }
}