:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #0a0a0f;
    --bg-secondary: #111118;
    --card-bg: #16161f;
    --card-bg-hover: #1c1c28;
    --text-color: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #2d2d3a;
    --border-light: #3d3d4a;
    --accent-pink: #ec4899;
    --accent-cyan: #22d3ee;
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
    --gradient-accent: linear-gradient(135deg, #22d3ee 0%, #6366f1 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

/* =============================================
   Header Styles
   ============================================= */

header {
    margin-bottom: 32px;
    padding: 32px;
    background: var(--card-bg);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    font-size: 3rem;
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.5));
}

.logo-text h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--bg-secondary);
    padding: 10px 18px;
    border-radius: 100px;
    border: 1px solid var(--border-color);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--warning-color);
    animation: pulse 2s infinite;
    box-shadow: 0 0 10px currentColor;
}

.dot.online {
    background: var(--success-color);
}

.dot.offline {
    background: var(--error-color);
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.9); }
}

/* =============================================
   Tab Styles
   ============================================= */

.tabs {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

.tab-button {
    flex: 1;
    padding: 16px 24px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.tab-button:hover {
    background: var(--card-bg-hover);
    border-color: var(--border-light);
    color: var(--text-color);
    transform: translateY(-2px);
}

.tab-button.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

.tab-icon {
    font-size: 1.2rem;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* =============================================
   Card Styles
   ============================================= */

.card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 32px;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.section-header {
    margin-bottom: 28px;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 8px;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =============================================
   Form Styles
   ============================================= */

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 500;
    color: var(--text-color);
    font-size: 0.95rem;
}

.file-upload-zone {
    position: relative;
    border: 2px dashed var(--border-color);
    border-radius: 14px;
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: var(--bg-secondary);
}

.file-upload-zone:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.file-upload-zone.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: scale(1.01);
}

.file-upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

.file-upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    pointer-events: none;
}

.upload-icon {
    font-size: 2.5rem;
    opacity: 0.8;
}

.upload-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.file-name {
    color: var(--primary-light);
    font-weight: 500;
    font-size: 0.9rem;
    min-height: 1.4em;
}

.file-hint {
    display: block;
    margin-top: 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* =============================================
   Button Styles
   ============================================= */

.btn-primary,
.btn-secondary,
.btn-outline,
.btn-danger {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.5);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-large {
    width: 100%;
    padding: 18px 32px;
    font-size: 1.1rem;
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--card-bg-hover);
    border-color: var(--border-light);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    background: var(--bg-secondary);
    color: var(--text-color);
    border-color: var(--border-light);
}

.btn-icon {
    font-size: 1.1em;
}

/* =============================================
   Progress Steps
   ============================================= */

.progress-container {
    margin: 28px 0;
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.progress-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
}

.progress-time {
    font-family: 'SF Mono', monospace;
    font-size: 0.9rem;
    color: var(--text-muted);
    background: var(--card-bg);
    padding: 4px 10px;
    border-radius: 6px;
}

.progress-steps {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 20px;
}

.progress-steps.compact {
    flex-direction: row;
    justify-content: space-between;
    gap: 8px;
}

.progress-steps.compact .step {
    flex: 1;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.progress-steps.compact .step-indicator {
    flex-direction: column;
    align-items: center;
}

.progress-steps.compact .step-line {
    display: none;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 8px 0;
}

.step-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.3s;
    flex-shrink: 0;
}

.step-line {
    width: 2px;
    height: 20px;
    background: var(--border-color);
    transition: all 0.3s;
}

.step-content {
    flex: 1;
    padding-top: 4px;
}

.step-title {
    display: block;
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: all 0.3s;
}

.step-desc {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Step States */
.step[data-status="active"] .step-circle {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
    animation: stepPulse 1.5s infinite;
}

.step[data-status="active"] .step-line {
    background: linear-gradient(to bottom, var(--primary-color), var(--border-color));
}

.step[data-status="active"] .step-title {
    color: var(--text-color);
}

.step[data-status="completed"] .step-circle {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.step[data-status="completed"] .step-circle::after {
    content: "✓";
    font-size: 0.9rem;
}

.step[data-status="completed"] .step-line {
    background: var(--success-color);
}

.step[data-status="completed"] .step-title {
    color: var(--success-color);
}

.step[data-status="error"] .step-circle {
    background: var(--error-color);
    border-color: var(--error-color);
    color: white;
}

@keyframes stepPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(99, 102, 241, 0.5); }
    50% { box-shadow: 0 0 30px rgba(99, 102, 241, 0.8); }
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 10px;
}

.progress-fill-animated {
    animation: progressAnimation 2s infinite;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-pink), var(--primary-color));
    background-size: 300% 100%;
}

@keyframes progressAnimation {
    0% { background-position: 0% 50%; width: 20%; }
    50% { background-position: 100% 50%; width: 80%; }
    100% { background-position: 0% 50%; width: 20%; }
}

.progress-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
    text-align: center;
}

/* =============================================
   Result Container
   ============================================= */

.result-container {
    margin: 28px 0;
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 24px;
    border: 1px solid var(--border-color);
}

.result-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.result-badge {
    background: var(--success-color);
    color: white;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 600;
}

.result-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
}

.video-wrapper {
    background: black;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
}

.video-wrapper video,
.video-wrapper img {
    width: 100%;
    display: block;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* =============================================
   Error Message
   ============================================= */

.error-message {
    padding: 16px 20px;
    border-radius: 12px;
    margin: 20px 0;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error-color);
    font-weight: 500;
}

/* =============================================
   Voice Chat Styles
   ============================================= */

.visualizer-container {
    background: linear-gradient(180deg, #0a0a0f 0%, #111118 100%);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

#audio-visualizer {
    width: 100%;
    height: 120px;
    display: block;
}

.visualizer-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    text-align: center;
}

.visualizer-status {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.3s;
}

.visualizer-status.listening {
    color: var(--accent-pink);
    animation: glowText 1.5s infinite;
}

.visualizer-status.processing {
    color: var(--warning-color);
}

@keyframes glowText {
    0%, 100% { text-shadow: 0 0 10px currentColor; }
    50% { text-shadow: 0 0 20px currentColor, 0 0 30px currentColor; }
}

.voice-controls {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 24px;
}

.btn-voice {
    position: relative;
    padding: 0;
    border: none;
    border-radius: 100px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: visible;
}

.btn-voice-inner {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 40px;
    border-radius: 100px;
    font-size: 1.15rem;
    font-weight: 600;
    color: white;
    position: relative;
    z-index: 1;
}

.btn-start .btn-voice-inner {
    background: linear-gradient(135deg, #ec4899, #8b5cf6);
}

.btn-stop .btn-voice-inner {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
}

.btn-pulse {
    position: absolute;
    inset: -4px;
    border-radius: 100px;
    background: linear-gradient(135deg, #ec4899, #8b5cf6);
    opacity: 0;
    z-index: 0;
    animation: btnPulse 2s infinite;
}

@keyframes btnPulse {
    0%, 100% { opacity: 0; transform: scale(1); }
    50% { opacity: 0.3; transform: scale(1.05); }
}

.btn-start:hover {
    transform: scale(1.05);
}

.btn-start:hover .btn-pulse {
    opacity: 0.4;
}

.btn-stop:hover {
    transform: scale(1.05);
}

.btn-start.recording .btn-pulse {
    animation: recordingPulse 1s infinite;
}

@keyframes recordingPulse {
    0%, 100% { opacity: 0.2; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.1); }
}

.btn-voice:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* =============================================
   Footer
   ============================================= */

footer {
    text-align: center;
    margin-top: 48px;
    padding: 24px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.footer-links a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.divider {
    color: var(--border-color);
}

/* =============================================
   Responsive
   ============================================= */

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-section {
        flex-direction: column;
    }
    
    .logo-text h1 {
        font-size: 2rem;
    }
    
    .tabs {
        flex-direction: column;
    }
    
    .card {
        padding: 20px;
    }
    
    .progress-steps.compact {
        flex-wrap: wrap;
    }
    
    .progress-steps.compact .step {
        min-width: calc(33% - 8px);
    }
    
    .btn-voice-inner {
        padding: 16px 28px;
        font-size: 1rem;
    }
}

/* =============================================
   Configuration Tab Styles
   ============================================= */

#config-tab .section-header {
    margin-bottom: 24px;
}

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

.config-section h4 {
    color: var(--accent-primary);
    margin-bottom: 16px;
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.config-section h4::before {
    content: '⚡';
    font-size: 1.2rem;
}

.config-section.audio-settings h4::before {
    content: '🔊';
}

.config-section.face-settings h4::before {
    content: '👤';
}

.config-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.config-grid .form-group {
    margin-bottom: 0;
}

.config-grid label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.config-grid input[type="number"],
.config-grid select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.config-grid input[type="number"]:focus,
.config-grid select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(var(--accent-primary-rgb), 0.2);
}

.config-grid input[type="number"]::-webkit-inner-spin-button,
.config-grid input[type="number"]::-webkit-outer-spin-button {
    opacity: 1;
}

.config-grid small {
    display: block;
    margin-top: 4px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.config-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.config-actions .btn-primary {
    min-width: 160px;
}

.config-actions .btn-secondary {
    min-width: 140px;
}

.config-message {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-weight: 500;
    display: none;
}

.config-message.success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.config-message.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error-color);
}

.config-message.info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: #3b82f6;
}

/* Responsive config grid */
@media (max-width: 768px) {
    .config-grid {
        grid-template-columns: 1fr;
    }
    
    .config-actions {
        flex-direction: column;
    }
    
    .config-actions .btn-primary,
    .config-actions .btn-secondary {
        width: 100%;
    }
}

/* =============================================
   Always Visible Video Container
   ============================================= */

.voice-video-always-visible {
    display: block !important;
}

.video-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-secondary) 100%);
    border-radius: 12px;
    border: 2px dashed var(--border-color);
    color: var(--text-muted);
    gap: 12px;
}

.video-placeholder .placeholder-icon {
    font-size: 48px;
    opacity: 0.5;
}

.video-placeholder .placeholder-text {
    font-size: 14px;
    opacity: 0.7;
}

.video-wrapper {
    position: relative;
    min-height: 300px;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    /* Prevent layout shifts */
    contain: layout;
}

.video-wrapper video {
    width: 100%;
    min-height: 300px;
    border-radius: 12px;
    background: #000;
    object-fit: contain;
    /* Prevent flash of empty content */
    visibility: visible;
}

/* When video has a source, ensure it doesn't collapse */
.video-wrapper video[src] {
    display: block;
}

/* Prevent collapse during video source change */
.voice-video-always-visible .video-wrapper {
    min-height: 350px;
}

.voice-video-always-visible video {
    min-height: 350px;
}