:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --bg-sidebar: #1e293b;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: rgba(255, 255, 255, 0.1);
    --danger: #ef4444;
}

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

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

#app {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Main Nav */
.main-nav {
    width: 64px;
    background: #020617;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0;
    z-index: 100;
}

.logo {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #818cf8, #c084fc);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: white;
}

.nav-links {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.nav-btn {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-main);
}

.nav-btn.active {
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
}

.nav-btn.bottom-btn {
    margin-top: auto;
}

.nav-btn.bottom-btn:hover {
    color: var(--danger);
}

/* Content Sidebar */
.content-sidebar {
    width: 320px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.content-sidebar.hide {
    width: 0;
    opacity: 0;
    overflow: hidden;
    border-right-width: 0;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.sidebar-header h3 {
    margin-bottom: 1rem;
    font-size: 1rem;
    letter-spacing: 0.025em;
}

.search-box input {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.6rem 0.75rem;
    color: white;
    font-size: 0.875rem;
    outline: none;
}

.import-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group input {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0.6rem 0.75rem;
    color: white;
    font-size: 0.8rem;
}

.input-group button {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.6rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.document-list-container {
    flex: 1;
    overflow-y: auto;
}

.document-list {
    list-style: none;
}

.document-item {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0.75rem;
    transition: background 0.2s;
}

.document-item:hover {
    background: rgba(255, 255, 255, 0.02);
}

.doc-info {
    flex: 1;
    overflow: hidden;
}

.doc-name {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.doc-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.delete-doc-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: 4px;
}

.delete-doc-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.empty-state {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: radial-gradient(circle at top right, rgba(99, 102, 241, 0.03), transparent);
}

.content-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.05);
}

.status-badge.ready {
    background: rgba(74, 222, 128, 0.1);
    color: #4ade80;
}

/* Chat Tab */
.tab-content {
    display: none;
    flex: 1;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    /* Smooth scrolling */
    scroll-behavior: smooth;
}

/* Premium Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

.message {
    max-width: 80%;
    padding: 1rem 1.25rem;
    border-radius: 12px;
    line-height: 1.6;
    font-size: 0.9375rem;
}

.message.user {
    align-self: flex-end;
    background: var(--primary);
    color: white;
}

.message.bot {
    align-self: flex-start;
    background: var(--bg-card);
    border: 1px solid var(--border);
    backdrop-filter: blur(8px);
}

.message.loading {
    color: var(--text-muted);
    font-style: italic;
    background: transparent;
    border: none;
}

.chat-input-area {
    padding: 1.5rem 2rem;
    background: linear-gradient(to top, var(--bg-dark), transparent);
}

.chat-input-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    gap: 1rem;
    background: var(--bg-card);
    padding: 0.75rem 1rem;
    border-radius: 14px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.chat-input-container input {
    flex: 1;
    background: transparent;
    border: none;
    color: white;
    outline: none;
}

.chat-input-container button {
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 10px;
    padding: 0.6rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
}

.chat-input-container button:disabled {
    opacity: 0.5;
}

.status-indicator {
    font-size: 0.75rem;
    padding: 4px;
}

.status-success {
    color: #4ade80;
}

.status-error {
    color: #f87171;
}

.status-pending {
    color: #fbbf24;
}
.voice-btn {
    background: transparent !important;
    border: 1px solid var(--border) !important;
    color: var(--text-muted) !important;
    padding: 0.6rem !important;
    min-width: 44px;
}

.voice-btn:hover:not(:disabled) {
    background: rgba(99, 102, 241, 0.1) !important;
    color: var(--primary) !important;
}

.voice-btn.recording {
    background: rgba(239, 68, 68, 0.15) !important;
    color: var(--danger) !important;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.voice-mode-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border);
    transition: all 0.2s;
}

.voice-mode-toggle:hover {
    background: rgba(99, 102, 241, 0.15);
}

.voice-mode-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.875rem;
    color: var(--text-main);
    user-select: none;
}

.voice-mode-toggle input:checked + .toggle-label {
    color: var(--primary);
}

.language-selector {
    padding: 0.5rem 0.75rem;
    border-radius: 8px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid var(--border);
    color: var(--text-main);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.language-selector:hover {
    background: rgba(99, 102, 241, 0.15);
}

.language-selector:focus {
    border-color: var(--primary);
}