/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --secondary-color: #ec4899;
    --secondary-light: #f472b6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-border: rgba(255, 255, 255, 0.18);
    --blur: blur(16px);
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Loading Screen */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loading-content {
    text-align: center;
    color: white;
    max-width: 400px;
    padding: var(--space-8);
}

.logo-animation {
    font-size: 4rem;
    margin-bottom: var(--space-6);
    animation: pulse 2s infinite;
}

.loading-screen h2 {
    font-size: var(--text-2xl);
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.loading-bar {
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: var(--space-4);
}

.loading-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.3s ease;
}

.loading-screen p {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--text-sm);
}

/* App Container */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: opacity 0.5s ease;
}

.app-container.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Header */
.header {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--glass-border);
    padding: var(--space-4) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: white;
}

.logo i {
    font-size: var(--text-2xl);
    color: var(--secondary-color);
}

.logo h1 {
    font-size: var(--text-2xl);
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #f3f4f6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.camera-status {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: white;
    font-size: var(--text-sm);
    font-weight: 500;
}

.emotion-status {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-full);
    color: white;
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all 0.3s ease;
}

.emotion-emoji-large {
    font-size: 1.5rem;
    filter: grayscale(100%);
    transition: all 0.3s ease;
}

.emotion-status.active .emotion-emoji-large {
    filter: grayscale(0%);
    animation: pulse 1s ease-in-out infinite;
}

.emotion-text {
    font-weight: 600;
    text-transform: capitalize;
}

.status-indicator i {
    animation: pulse 2s infinite;
}

.status-indicator.active i {
    color: var(--success-color);
}

.status-indicator.error i {
    color: var(--error-color);
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-8) var(--space-6);
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--space-8);
    align-items: start;
}

/* Video Container */
.video-container {
    width: 100%;
}

.video-frame {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-xl);
    aspect-ratio: 16/9;
    max-height: 500px;
}

#videoElement {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

#overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    transition: opacity 0.3s ease;
}

.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.no-face-message {
    text-align: center;
    color: white;
}

.no-face-message i {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-3);
    opacity: 0.7;
}

.no-face-message p {
    font-size: var(--text-lg);
    font-weight: 500;
}

/* Video Controls */
.video-controls {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-6);
    flex-wrap: wrap;
}

.control-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    color: white;
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.control-btn.primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border: none;
}

.control-btn.primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

.control-btn.secondary {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
}

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

/* Status Panel */
.status-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    padding: var(--space-6);
    color: white;
    box-shadow: var(--shadow-xl);
    height: fit-content;
    position: sticky;
    top: 120px;
}

.status-panel h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-6);
    text-align: center;
}

.status-card {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-bottom: var(--space-4);
}

.status-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.status-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
}

.status-icon.faces {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
}

.status-icon.confidence {
    background: linear-gradient(135deg, var(--success-color), #34d399);
}

.status-icon.fps {
    background: linear-gradient(135deg, var(--warning-color), #fbbf24);
}

.status-info {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.status-label {
    font-size: var(--text-sm);
    opacity: 0.8;
    margin-bottom: var(--space-1);
}

.status-value {
    font-size: var(--text-xl);
    font-weight: 600;
}

/* Emotion Panel */
.emotion-panel {
    margin-top: var(--space-6);
}

.emotion-panel h4 {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-4);
    text-align: center;
}

.emotion-grid {
    display: grid;
    gap: var(--space-3);
}

.emotion-item {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    font-size: var(--text-sm);
    transition: all 0.3s ease;
}

.emotion-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.emotion-emoji {
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
    filter: grayscale(100%);
    transition: filter 0.3s ease;
}

.emotion-item.active .emotion-emoji {
    filter: grayscale(0%);
    animation: bounce 0.5s ease;
}

.emotion-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    overflow: hidden;
    min-width: 60px;
    position: relative;
}

.emotion-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.3s ease;
    position: relative;
}

.emotion-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

.emotion-percentage {
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--primary-light);
    min-width: 30px;
    text-align: right;
}

/* Emotion-specific colors */
.emotion-item[data-emotion="happy"] .emotion-fill {
    background: linear-gradient(90deg, #fbbf24, #f59e0b);
}

.emotion-item[data-emotion="sad"] .emotion-fill {
    background: linear-gradient(90deg, #3b82f6, #1d4ed8);
}

.emotion-item[data-emotion="angry"] .emotion-fill {
    background: linear-gradient(90deg, #ef4444, #dc2626);
}

.emotion-item[data-emotion="fearful"] .emotion-fill {
    background: linear-gradient(90deg, #8b5cf6, #7c3aed);
}

.emotion-item[data-emotion="disgusted"] .emotion-fill {
    background: linear-gradient(90deg, #10b981, #059669);
}

.emotion-item[data-emotion="surprised"] .emotion-fill {
    background: linear-gradient(90deg, #f97316, #ea580c);
}

.emotion-item[data-emotion="neutral"] .emotion-fill {
    background: linear-gradient(90deg, #6b7280, #4b5563);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: var(--blur);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
}

.modal-content {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    color: white;
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.modal-header h3 {
    font-size: var(--text-xl);
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    color: white;
    font-size: var(--text-lg);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background 0.2s ease;
}

.close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.modal-body {
    padding: var(--space-6);
}

.setting-group {
    margin-bottom: var(--space-6);
}

.setting-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.setting-select,
.setting-range {
    width: 100%;
    padding: var(--space-3);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    color: white;
    font-size: var(--text-sm);
}

.setting-select option {
    background: var(--bg-dark);
    color: white;
}

.setting-range {
    padding: 0;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
}

.setting-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.setting-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.range-value {
    display: inline-block;
    margin-left: var(--space-3);
    font-weight: 600;
    color: var(--primary-light);
}

.setting-checkbox {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.setting-checkbox input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--primary-color);
}

/* Footer */
.footer {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border-top: 1px solid var(--glass-border);
    padding: var(--space-6) 0;
    margin-top: var(--space-8);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    text-align: center;
    color: white;
}

.privacy-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    margin-bottom: var(--space-3);
    opacity: 0.9;
}

.privacy-notice i {
    color: var(--success-color);
}

.credits {
    font-size: var(--text-xs);
    opacity: 0.7;
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--space-6);
    right: var(--space-6);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: var(--blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    color: white;
    max-width: 300px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    animation: slideIn 0.3s ease;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

.toast-icon {
    font-size: var(--text-lg);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    font-size: var(--text-sm);
    margin-bottom: var(--space-1);
}

.toast-message {
    font-size: var(--text-xs);
    opacity: 0.9;
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: var(--space-6);
        padding: var(--space-6) var(--space-4);
    }

    .header-content {
        padding: 0 var(--space-4);
        flex-direction: column;
        gap: var(--space-3);
    }

    .camera-status {
        flex-direction: column;
        gap: var(--space-2);
        width: 100%;
        justify-content: center;
    }

    .logo h1 {
        font-size: var(--text-xl);
    }

    .video-controls {
        justify-content: center;
    }

    .control-btn {
        flex: 1;
        justify-content: center;
        min-width: 0;
    }

    .control-btn span {
        display: none;
    }

    .status-panel {
        order: -1;
        position: static;
    }

    .emotion-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-2);
    }

    .emotion-item {
        grid-template-columns: auto 1fr auto;
        gap: var(--space-2);
        padding: var(--space-2);
    }

    .emotion-item span:not(.emotion-percentage) {
        font-size: var(--text-xs);
    }

    .emotion-bar {
        min-width: 40px;
    }

    .toast-container {
        left: var(--space-4);
        right: var(--space-4);
    }

    .toast {
        max-width: none;
    }

    .modal-content {
        margin: var(--space-4);
        width: calc(100% - 2rem);
    }
}

@media (max-width: 480px) {
    .header-content {
        gap: var(--space-2);
    }

    .logo {
        gap: var(--space-2);
    }

    .logo h1 {
        font-size: var(--text-lg);
    }

    .main-content {
        padding: var(--space-4) var(--space-3);
    }

    .video-frame {
        border-radius: var(--radius-xl);
    }

    .status-panel,
    .modal-content {
        border-radius: var(--radius-xl);
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --glass-bg: rgba(0, 0, 0, 0.8);
        --glass-border: rgba(255, 255, 255, 0.3);
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print styles */
@media print {
    .app-container {
        background: white;
        color: black;
    }
    
    .video-container,
    .video-controls,
    .footer {
        display: none;
    }
}