:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-tertiary: #242836;
    --text-primary: #e4e6eb;
    --text-secondary: #a0a3b1;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;
    --border: #2d3142;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

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

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

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

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 24px;
}

.sidebar-header h2 {
    font-size: 18px;
    margin-bottom: 24px;
}

.sidebar-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.toggle {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    font-size: 14px;
}

.toggle input {
    display: none;
}

.toggle-slider {
    width: 44px;
    height: 24px;
    background: var(--bg-tertiary);
    border-radius: 12px;
    position: relative;
    transition: background 0.3s;
}

.toggle-slider::after {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    background: var(--text-secondary);
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: all 0.3s;
}

.toggle input:checked + .toggle-slider {
    background: var(--accent);
}

.toggle input:checked + .toggle-slider::after {
    transform: translateX(20px);
    background: white;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
}

.btn-primary:disabled {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

/* Main Content */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.main-header {
    text-align: center;
    margin-bottom: 32px;
}

.main-header h1 {
    font-size: 32px;
    margin-bottom: 8px;
}

.main-header p {
    color: var(--text-secondary);
}

/* Video Input */
.video-input {
    background: var(--bg-secondary);
    padding: 24px;
    border-radius: var(--radius);
    margin-bottom: 24px;
}

.video-input h2 {
    font-size: 16px;
    margin-bottom: 16px;
}

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

.input-group input {
    flex: 1;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.status {
    margin-top: 12px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 13px;
    display: none;
}

.status.loading {
    display: block;
    background: var(--bg-tertiary);
    color: var(--warning);
}

.status.success {
    display: block;
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.status.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.transcript-info {
    margin-top: 12px;
    padding: 12px 16px;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 8px;
    font-size: 13px;
    color: var(--accent);
    display: none;
}

/* Chat Section */
.chat-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-section h2 {
    font-size: 16px;
    margin-bottom: 16px;
}

.chat-container {
    flex: 1;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 20px;
    overflow-y: auto;
    min-height: 400px;
    max-height: 500px;
    margin-bottom: 16px;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
    padding: 60px 20px;
}

.message {
    margin-bottom: 16px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.message-header {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.message-header .icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.user .icon {
    background: var(--accent);
    color: white;
}

.assistant .icon {
    background: var(--success);
    color: white;
}

.message-body {
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.7;
    white-space: pre-wrap;
}

.user .message-body {
    background: var(--accent);
    color: white;
    margin-left: 32px;
    border-bottom-left-radius: 4px;
}

.assistant .message-body {
    background: var(--bg-tertiary);
    margin-right: 32px;
    border-bottom-right-radius: 4px;
}

.message-sources {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 6px;
    margin-left: 32px;
}

.message-audio {
    margin-top: 8px;
    margin-left: 32px;
}

.message-audio audio {
    height: 36px;
    width: 100%;
    max-width: 400px;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 14px 18px;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--text-secondary);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

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

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Chat Input */
.chat-input-group {
    display: flex;
    gap: 12px;
}

.chat-input-group input {
    flex: 1;
    padding: 14px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .app {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        padding: 16px;
        gap: 16px;
        overflow-x: auto;
    }

    .sidebar-header {
        display: none;
    }

    .sidebar-content {
        flex-direction: row;
        align-items: center;
    }

    .main {
        padding: 16px;
    }
}

/* Mic button */
.btn-icon {
    width: 42px;
    height: 42px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.2s;
    flex-shrink: 0;
}

.btn-icon:hover:not(:disabled) {
    background: var(--bg-secondary);
    color: var(--text);
}

.btn-icon.recording {
    background: var(--error);
    color: white;
    border-color: var(--error);
    animation: pulse 1s infinite;
}

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