frontend/styles.css

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

:root {
    --primary: #667eea;
    --primary-dark: #764ba2;
    --primary-light: #7c8ff5;
    --accent: #f093fb;
    --success: #00d4ff;
    --danger: #ff6b6b;
    --dark: #1a1f3a;
    --light: #f8f9ff;
}

body {
    font-family: 'Inter', 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1f3a 50%, #2d1b4e 100%);
    min-height: 100vh;
    padding: 30px 15px;
    color: #333;
    position: relative;
    overflow-x: hidden;
}

/* Animated background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(240, 147, 251, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, 30px); }
}


.container {
    max-width: 1400px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: slideUp 0.8s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

.header-content {
    position: relative;
    z-index: 1;
}

.header h1 {
    font-size: 3.5em;
    margin-bottom: 15px;
    font-weight: 800;
    letter-spacing: -2px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    animation: slideDown 0.6s ease-out;
}

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

.header p {
    font-size: 1.3em;
    opacity: 0.95;
    animation: fadeIn 0.8s ease-out 0.2s both;
}

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

.main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    padding: 50px 40px;
    min-height: 700px;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: 30px 25px;
    }
}

.section {
    display: flex;
    flex-direction: column;
    gap: 25px;
    animation: fadeIn 0.8s ease-out 0.3s both;
}

.section h2 {
    color: #333;
    font-size: 2em;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 10px;
}

.section h2::after {
    content: '';
    flex: 1;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2, transparent);
    border-radius: 2px;
}

/* Upload Area - Enhanced */
.upload-area {
    border: 2px dashed #667eea;
    border-radius: 15px;
    padding: 50px 30px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f2ff 100%);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.upload-area:hover::before {
    left: 100%;
}

.upload-area:hover {
    border-color: #764ba2;
    background: linear-gradient(135deg, #f0f2ff 0%, #e8ebff 100%);
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.upload-area.dragging {
    border-color: #764ba2;
    background: #e8ebff;
    transform: scale(1.02);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.3);
}

.upload-area input {
    display: none;
}

.upload-icon {
    font-size: 4em;
    margin-bottom: 15px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.upload-area p {
    color: #667eea;
    margin-bottom: 8px;
    font-weight: 600;
}

.upload-area p strong {
    color: #764ba2;
    display: block;
    font-size: 1.1em;
}

.upload-area .small {
    font-size: 0.9em;
    color: #999;
}

/* Preview - Enhanced */
.preview-image {
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(135deg, #f5f5f5 0%, #e8e8e8 100%);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.preview-image:hover {
    transform: scale(1.02);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.2);
}

.preview-image img {
    width: 100%;
    height: auto;
    display: block;
}

.image-label {
    font-size: 0.85em;
    color: #667;
    text-align: center;
    margin-top: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Controls - Enhanced */
.controls {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 25px;
    background: #f8f9ff;
    border-radius: 12px;
    border-left: 4px solid #667eea;
}

label {
    display: block;
    color: #333;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

select {
    padding: 14px 16px;
    border: 2px solid #ddd;
    border-radius: 10px;
    font-size: 1em;
    cursor: pointer;
    background: white;
    color: #333;
    transition: all 0.3s ease;
    font-weight: 500;
}

select:hover {
    border-color: #667eea;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.1);
}

select:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

button {
    padding: 14px 20px;
    border: none;
    border-radius: 10px;
    font-size: 1em;
    cursor: pointer;
    font-weight: 700;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: left 0.5s ease;
    z-index: -1;
}

button:hover::before {
    left: 100%;
}

#predictBtn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

#predictBtn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

#clearBtn {
    background: #f0f0f0;
    color: #333;
}

#clearBtn:hover {
    background: #e0e0e0;
    transform: translateY(-2px);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Messages - Enhanced */
.message {
    padding: 16px 18px;
    border-radius: 10px;
    margin-bottom: 15px;
    display: none;
    border-left: 4px solid;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.message.active {
    display: block;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border-left-color: #28a745;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border-left-color: #f5c6cb;
}

.message.info {
    background: #d1ecf1;
    color: #0c5460;
    border-left-color: #17a2b8;
}

/* Loading Spinner - Advanced */
.loading {
    display: none;
    text-align: center;
    padding: 40px;
}

.loading.active {
    display: block;
}

.spinner {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading p {
    color: #667eea;
    font-weight: 600;
    font-size: 1.1em;
}

/* Results Section - Enhanced */
.results-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 25px;
    animation: fadeIn 0.6s ease-out;
}

@media (max-width: 768px) {
    .results-section {
        grid-template-columns: 1fr;
    }
}

.result-item {
    border-radius: 12px;
    overflow: hidden;
    background: #f5f5f5;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.result-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.2);
}

.result-item img {
    width: 100%;
    height: auto;
    display: block;
    background: linear-gradient(135deg, #f8f9ff, #f0f2ff);
}

/* Comparison Slider */
.comparison-slider {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: 12px;
    margin-top: 30px;
}

.img-wrapper {
    position: relative;
    width: 100%;
}

.img-before {
    display: block;
    width: 100%;
}

.img-after {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
}

.img-after img {
    width: 100%;
    height: auto;
    display: block;
}

.slider-handle {
    position: absolute;
    top: 0;
    left: 50%;
    width: 3px;
    height: 100%;
    background: linear-gradient(90deg, #667eea, #f093fb);
    cursor: ew-resize;
    z-index: 3;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.slider-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    z-index: 4;
    color: white;
    font-size: 20px;
}

/* Stats Box - Enhanced */
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
    margin-top: 25px;
}

.stat-box {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    color: white;
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
    transition: all 0.3s ease;
}

.stat-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.8em;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-value {
    font-weight: 700;
    font-size: 1.5em;
    color: white;
}

/* Footer */
.footer {
    background: #f5f5f5;
    padding: 30px 40px;
    text-align: center;
    color: #666;
    font-size: 0.9em;
    border-top: 1px solid #ddd;
}

.footer p {
    margin: 5px 0;
}

.footer code {
    background: #e8e8e8;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: 'Monaco', monospace;
    color: #667eea;
}

.hidden {
    display: none !important;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* Tooltip */
.tooltip {
    position: relative;
    display: inline-block;
    cursor: help;
}

.tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: #333;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 8px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -100px;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.85em;
}

.tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
}