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

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--background-color) 0%, #1a202c 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--surface-color);
    border-radius: 15px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Main Content Layout */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 20px;
    margin-bottom: 30px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
}

/* Controls Panel */
.controls-panel {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 4px 20px var(--shadow-color);
    height: fit-content;
    position: sticky;
    top: 20px;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.control-group select,
.control-group input[type="range"] {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--background-color);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.3s ease;
}

.control-group select:focus,
.control-group input[type="range"]:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Range Slider Styling */
input[type="range"] {
    -webkit-appearance: none;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

/* Buttons */
.button-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #475569;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(100, 116, 139, 0.4);
}

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

.btn-accent:hover:not(:disabled) {
    background: #d97706;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.4);
}

/* Toggle Switches */
.toggle-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.toggle {
    position: relative;
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
}

.toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
    background-color: var(--border-color);
    border-radius: 24px;
    margin-right: 12px;
    transition: 0.3s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
    transition: 0.3s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

/* Video Container */
.video-container {
    background: var(--surface-color);
    border-radius: 15px;
    padding: 20px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.video-wrapper {
    position: relative;
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    background: #000;
}

#video {
    width: 100%;
    height: auto;
    display: block;
}

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

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

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

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#loading-text {
    color: var(--text-secondary);
    font-size: 14px;
    text-align: center;
}

/* Stats Panel */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.stat-item {
    background: var(--background-color);
    padding: 15px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-item i {
    color: var(--primary-color);
    margin-right: 8px;
}

.stat-item span {
    font-size: 14px;
    font-weight: 600;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--surface-color);
    padding: 30px;
    border-radius: 15px;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 10px 40px var(--shadow-color);
}

.modal-content h3 {
    color: var(--error-color);
    margin-bottom: 15px;
    font-size: 1.5rem;
}

.modal-content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Info Panel */
.info-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.info-section {
    background: var(--surface-color);
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.info-section h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.info-section ul,
.info-section ol {
    padding-left: 20px;
    color: var(--text-secondary);
}

.info-section li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.info-section strong {
    color: var(--text-primary);
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: var(--accent-color);
}

/* Value Display */
#confidence-value,
#nms-value {
    display: inline-block;
    min-width: 50px;
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .controls-panel {
        position: static;
    }
    
    .stats-panel {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .info-panel {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .stats-panel {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: 20px;
        margin: 20px;
    }
}

/* Detection Visualization Styles */
.detection-box {
    position: absolute;
    border: 3px solid var(--success-color);
    border-radius: 4px;
    pointer-events: none;
    z-index: 5;
}

.detection-label {
    position: absolute;
    background: var(--success-color);
    color: white;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 4px 4px 0 0;
    top: -25px;
    left: 0;
    white-space: nowrap;
}

.landmark-point {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--accent-color);
    border: 2px solid white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 6;
}

/* Animation Classes */
.pulse {
    animation: pulse 2s infinite;
}

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

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

/* Photo Upload Section */
.photo-upload-section {
    margin-top: 30px;
    padding-top: 25px;
    border-top: 2px solid var(--border-color);
}

.photo-upload-section h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.2em;
    text-align: center;
}

.file-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    border: none;
    text-decoration: none;
}

.file-label:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.file-name {
    display: block;
    margin-top: 10px;
    padding: 8px 12px;
    background: var(--background-secondary);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.9em;
    border: 1px solid var(--border-color);
}

.file-name.has-file {
    color: var(--text-primary);
    background: rgba(34, 197, 94, 0.1);
    border-color: rgba(34, 197, 94, 0.3);
}