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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header .logo a {
    color: white;
    text-decoration: none;
    font-size: 2rem;
    font-weight: 700;
}

header .tagline {
    margin-top: 0.5rem;
    font-size: 1rem;
    opacity: 0.9;
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
}

/* Upload Section */
.upload-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.upload-section h2 {
    margin-bottom: 1.5rem;
    color: #667eea;
    text-align: center;
}

/* Tabs */
.tab-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid #e0e0e0;
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: #666;
    transition: all 0.3s;
}

.tab-btn.active {
    color: #667eea;
    border-bottom-color: #667eea;
}

.tab-btn:hover {
    color: #667eea;
}

.tab-content {
    display: none;
}

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

/* File Upload */
.file-input-wrapper {
    position: relative;
    margin-bottom: 1.5rem;
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    overflow: hidden;
}

.file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 2rem;
    border: 3px dashed #ccc;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    background: #fafafa;
}

.file-label:hover {
    border-color: #667eea;
    background: #f0f4ff;
}

.file-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.file-text {
    font-size: 1.1rem;
    color: #666;
}

/* Preview */
.preview-container {
    margin: 1.5rem 0;
    text-align: center;
}

.preview-container img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* URL Input */
.input-group {
    margin-bottom: 1.5rem;
}

.input-group input[type="url"] {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input[type="url"]:focus {
    outline: none;
    border-color: #667eea;
}

/* Search Options */
.search-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: #f9f9f9;
    border-radius: 8px;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.option-group label {
    font-weight: 600;
    color: #555;
}

.option-group input[type="number"],
.option-group input[type="range"] {
    padding: 0.5rem;
    border: 2px solid #e0e0e0;
    border-radius: 4px;
    font-size: 1rem;
}

.option-group input[type="range"] {
    width: 100%;
}

#threshold-value,
#url-threshold-value {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #667eea;
    color: white;
    border-radius: 4px;
    font-weight: 600;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(102, 126, 234, 0.4);
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

.btn-loader {
    display: none;
}

/* Error Message */
.error-message {
    padding: 1rem;
    margin-top: 1rem;
    background: #fee;
    border: 2px solid #fcc;
    border-radius: 8px;
    color: #c00;
}

/* Results Section */
.results-section {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.results-section h2 {
    margin-bottom: 1.5rem;
    color: #667eea;
    text-align: center;
}

.query-image-container {
    text-align: center;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: #f9f9f9;
    border-radius: 8px;
}

.query-image-container h3 {
    margin-bottom: 1rem;
    color: #555;
}

.query-image-container img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.results-info {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.result-card {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s;
    cursor: pointer;
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.result-card img {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.result-info {
    padding: 1rem;
}

.result-name {
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #333;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.result-category {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.result-similarity {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: #667eea;
    color: white;
    border-radius: 4px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Footer */
footer {
    background: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
    margin-top: 3rem;
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    header .logo a {
        font-size: 1.5rem;
    }

    .upload-section,
    .results-section {
        padding: 1.5rem;
    }

    .search-options {
        grid-template-columns: 1fr;
    }

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

    .result-card img {
        height: 180px;
    }

    .tab-buttons {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .results-grid {
        grid-template-columns: 1fr;
    }

    .result-card img {
        height: 200px;
    }
}