/* ============================================
   Webcam Test - TechTools.cz
   Dark theme with glassmorphism design
   ============================================ */

/* CSS Variables */
:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #1a1a2e;
    --card-bg: #232338;
    --border-color: rgba(255, 255, 255, 0.1);

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);

    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: rgba(26, 26, 46, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.header-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-title i {
    font-size: 1.5rem;
    color: var(--accent-primary);
}

.header-title h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-spacer {
    width: 120px;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* State Containers */
.state-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.state-container.hidden {
    display: none;
}

/* Initial State - Start Card */
.start-card {
    text-align: center;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    max-width: 500px;
    margin-top: 2rem;
}

.start-icon {
    width: 100px;
    height: 100px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.5rem;
    color: white;
    box-shadow: 0 0 40px rgba(99, 102, 241, 0.4);
}

.start-card h2 {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.start-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.privacy-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 1.5rem !important;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

/* Error State */
.error-card {
    text-align: center;
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(239, 68, 68, 0.3);
    max-width: 500px;
    margin-top: 2rem;
}

.error-icon {
    width: 80px;
    height: 80px;
    background: rgba(239, 68, 68, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
    color: var(--danger);
}

.error-card h2 {
    color: var(--danger);
    margin-bottom: 0.5rem;
}

.error-card > p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.error-tips {
    text-align: left;
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.error-tips h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.error-tips ul {
    list-style: none;
    font-size: 0.9rem;
}

.error-tips li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.error-tips li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Video Container */
.video-container {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16 / 9;
}

#video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
    transform: scaleX(-1); /* Mirror by default */
}

#video.no-mirror {
    transform: scaleX(1);
}

#canvas {
    display: none;
}

.video-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.75rem;
}

.overlay-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(0, 0, 0, 0.7);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}

.overlay-stat i {
    color: var(--accent-primary);
}

.video-loading {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.video-loading.hidden {
    display: none;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Controls */
.controls-container {
    max-width: 900px;
    margin: 1.5rem auto 0;
    width: 100%;
}

.controls-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.controls-buttons {
    flex-wrap: wrap;
    justify-content: center;
}

.control-group {
    flex: 1;
    min-width: 200px;
}

.control-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.select-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-family);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

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

.select-input:hover {
    border-color: var(--accent-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 2px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: rgba(99, 102, 241, 0.1);
    border-color: var(--accent-primary);
}

.btn-secondary.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.3);
}

/* Info Panel */
.info-panel {
    max-width: 900px;
    margin: 2rem auto 0;
    width: 100%;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
}

.info-panel h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.info-panel h3 i {
    color: var(--accent-primary);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.info-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 1rem;
    border-radius: var(--radius-md);
}

.info-item-full {
    grid-column: 1 / -1;
}

.info-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.info-value i {
    margin-right: 0.25rem;
}

/* Brightness Bar */
.brightness-bar {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    margin: 0.5rem 0;
    overflow: hidden;
}

.brightness-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 4px;
    transition: width var(--transition-base);
    width: 0%;
}

/* Photos Container */
.photos-container {
    max-width: 900px;
    margin: 2rem auto 0;
    width: 100%;
}

.photos-container.hidden {
    display: none;
}

.photos-container h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.photos-container h3 i {
    color: var(--accent-primary);
}

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.photo-item {
    position: relative;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.photo-item:hover {
    transform: scale(1.03);
}

.photo-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.photo-item .photo-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.photo-item:hover .photo-overlay {
    opacity: 1;
}

.photo-overlay i {
    font-size: 1.5rem;
    color: white;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
}

.modal.hidden {
    display: none;
}

.modal-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--accent-primary);
}

#modal-image {
    max-width: 100%;
    max-height: 70vh;
    border-radius: var(--radius-md);
}

.modal-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

/* Hidden utility */
.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .header-spacer {
        display: none;
    }

    .back-link span {
        display: none;
    }

    .main-content {
        padding: 1rem;
    }

    .start-card,
    .error-card {
        padding: 2rem 1.5rem;
    }

    .controls-row {
        flex-direction: column;
    }

    .control-group {
        min-width: 100%;
    }

    .controls-buttons {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .controls-buttons .btn {
        flex: 1;
        min-width: calc(50% - 0.5rem);
    }

    .controls-buttons .btn span {
        display: none;
    }

    .info-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .photos-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .video-overlay {
        top: 0.5rem;
        left: 0.5rem;
        gap: 0.5rem;
    }

    .overlay-stat {
        padding: 0.35rem 0.5rem;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .start-icon {
        width: 80px;
        height: 80px;
        font-size: 2rem;
    }

    .start-card h2 {
        font-size: 1.4rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
}

/* Fullscreen */
.video-container:fullscreen {
    max-width: 100%;
    border-radius: 0;
    aspect-ratio: auto;
}

.video-container:fullscreen #video {
    width: 100%;
    height: 100%;
}

/* SEO Content Section */
.seo-content {
    background: var(--secondary-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 2rem;
    margin-top: 3rem;
}

.seo-container {
    max-width: 900px;
    margin: 0 auto;
}

.seo-content h2 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.seo-content h3 {
    font-size: 1.25rem;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.seo-content p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1rem;
}

.seo-content ul {
    list-style: none;
    padding: 0;
}

.seo-content .feature-list li,
.seo-content .resolution-list li {
    padding: 0.5rem 0 0.5rem 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.seo-content .feature-list li::before,
.seo-content .resolution-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.seo-content .feature-list li strong,
.seo-content .resolution-list li strong {
    color: var(--text-primary);
}

/* FAQ Section */
.faq-section {
    margin-top: 1rem;
}

.faq-section details {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    overflow: hidden;
}

.faq-section summary {
    padding: 1rem 1.25rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: background var(--transition-fast);
}

.faq-section summary:hover {
    background: rgba(255, 255, 255, 0.03);
}

.faq-section summary::after {
    content: '+';
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--accent-primary);
    transition: transform var(--transition-fast);
}

.faq-section details[open] summary::after {
    content: '−';
}

.faq-section summary::-webkit-details-marker {
    display: none;
}

.faq-section details p {
    padding: 0 1.25rem 1rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .seo-content {
        padding: 2rem 1rem;
    }

    .seo-content h2 {
        font-size: 1.5rem;
    }

    .seo-content h3 {
        font-size: 1.1rem;
    }
}

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