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

:root {
    --primary-color: #FF9900;
    --secondary-color: #232F3E;
    --accent-color: #146EB4;
    --success-color: #4CAF50;
    --error-color: #f44336;
    --text-dark: #333;
    --text-light: #666;
    --bg-light: #f5f5f5;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-hover: 0 4px 20px rgba(0,0,0,0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-dark);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

/* Header */
header {
    background: var(--secondary-color);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

/* Main Content */
main {
    padding: 40px 30px;
}

/* Upload Section */
.upload-section {
    margin-bottom: 30px;
}

.upload-area {
    border: 3px dashed var(--border-color);
    border-radius: 12px;
    padding: 60px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-light);
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #fff;
    transform: translateY(-2px);
}

.upload-area.dragover {
    border-color: var(--accent-color);
    background: #e3f2fd;
}

.upload-content {
    pointer-events: none;
}

.upload-icon {
    width: 80px;
    height: 80px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.upload-area h2 {
    color: var(--text-dark);
    margin-bottom: 10px;
}

.upload-area p {
    color: var(--text-light);
    margin-bottom: 5px;
}

.file-info {
    font-size: 0.9em;
    color: var(--text-light);
    margin-top: 15px;
}

/* Preview Section */
.preview-section {
    margin-bottom: 30px;
    animation: fadeIn 0.5s ease;
}

.preview-container {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

#imagePreview {
    width: 100%;
    max-height: 500px;
    object-fit: contain;
    background: #000;
}

.btn-remove {
    position: absolute;
    top: 15px;
    right: 15px;
    background: rgba(244, 67, 54, 0.9);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-remove:hover {
    background: var(--error-color);
    transform: scale(1.05);
}

/* Action Section */
.action-section {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeIn 0.5s ease;
}

.btn-analyze {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 16px 48px;
    font-size: 1.2em;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn-analyze:hover {
    background: #ec8807;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

/* Loading Section */
.loading-section {
    text-align: center;
    padding: 60px 20px;
    animation: fadeIn 0.5s ease;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 6px solid var(--bg-light);
    border-top: 6px solid var(--primary-color);
    border-radius: 50%;
    margin: 0 auto 20px;
    animation: spin 1s linear infinite;
}

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

.loading-section p {
    font-size: 1.1em;
    color: var(--text-light);
}

/* Results Section */
.results-section {
    animation: fadeIn 0.5s ease;
}

.results-header {
    margin-bottom: 30px;
}

.results-header h2 {
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.confidence-filter {
    background: var(--bg-light);
    padding: 20px;
    border-radius: 8px;
}

.confidence-filter label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    color: var(--text-dark);
}

#confidenceValue {
    color: var(--primary-color);
    font-weight: 700;
}

#confidenceSlider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    outline: none;
    -webkit-appearance: none;
    background: var(--border-color);
}

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

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

/* Labels Container */
.labels-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.label-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    animation: slideUp 0.5s ease;
}

.label-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.label-name {
    font-size: 1.2em;
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.label-confidence {
    display: flex;
    align-items: center;
    gap: 10px;
}

.confidence-bar {
    flex: 1;
    height: 8px;
    background: var(--bg-light);
    border-radius: 4px;
    overflow: hidden;
}

.confidence-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color), var(--primary-color));
    transition: width 0.5s ease;
}

.confidence-text {
    font-weight: 600;
    color: var(--primary-color);
}

/* Buttons */
.btn-new-analysis, .btn-retry {
    display: block;
    margin: 0 auto;
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 14px 40px;
    font-size: 1.1em;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn-new-analysis:hover, .btn-retry:hover {
    background: #0d5a94;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Error Section */
.error-section {
    text-align: center;
    padding: 40px 20px;
    animation: fadeIn 0.5s ease;
}

.error-message {
    background: #ffebee;
    border: 2px solid var(--error-color);
    border-radius: 12px;
    padding: 30px;
    margin-bottom: 20px;
}

.error-icon {
    font-size: 3em;
    display: block;
    margin-bottom: 15px;
}

.error-message p {
    color: var(--error-color);
    font-size: 1.1em;
    font-weight: 600;
}

/* Footer */
footer {
    background: var(--bg-light);
    padding: 30px;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

footer p {
    margin-bottom: 10px;
    color: var(--text-light);
}

footer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

.tech-stack {
    font-size: 0.9em;
    color: var(--text-light);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 1em;
    }

    main {
        padding: 30px 20px;
    }

    .upload-area {
        padding: 40px 20px;
    }

    .upload-icon {
        width: 60px;
        height: 60px;
    }

    .labels-container {
        grid-template-columns: 1fr;
    }

    .btn-analyze {
        padding: 14px 32px;
        font-size: 1.1em;
    }
}