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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --dark-color: #1f2937;
    --light-color: #f9fafb;
    --gray-color: #9ca3af;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
    --radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    color: var(--dark-color);
    min-height: 100vh;
    line-height: 1.6;
}

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

/* Header & Navigation */
.header {
    background: white;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--dark-color);
}

.logo-icon {
    background: var(--gradient);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    font-family: 'Montserrat', sans-serif;
}

.logo-highlight {
    color: var(--primary-color);
    font-weight: 900;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--dark-color);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
    background: var(--gradient);
    color: white;
}

.nav-actions {
    display: flex;
    gap: 1rem;
}

/* Hero Section */
.hero-section {
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
    font-family: 'Montserrat', sans-serif;
}

.gradient-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--gray-color);
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* Upload Area */
.upload-area {
    background: white;
    border: 3px dashed #e5e7eb;
    border-radius: var(--radius);
    padding: 3rem 2rem;
    margin: 2rem auto;
    max-width: 800px;
    transition: var(--transition);
    cursor: pointer;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background: #f8fafc;
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.upload-icon {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-area h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.upload-area p {
    color: var(--gray-color);
    margin-bottom: 2rem;
}

.file-info {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--radius);
    display: none;
}

.file-info.active {
    display: block;
}

/* Buttons */
.btn {
    padding: 0.8rem 2rem;
    border: none;
    border-radius: var(--radius);
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-secondary:hover {
    background: #374151;
    transform: translateY(-2px);
}

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--gray-color);
    color: var(--dark-color);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-small {
    padding: 0.5rem 1.5rem;
    font-size: 0.9rem;
}

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

/* Preview Section */
.preview-section {
    margin-top: 3rem;
    animation: fadeIn 0.5s ease;
}

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

.preview-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

.preview-box {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.preview-box h4 {
    margin-bottom: 1rem;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.image-preview {
    width: 100%;
    height: 300px;
    border-radius: calc(var(--radius) - 5px);
    overflow: hidden;
    background: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.placeholder-result {
    color: var(--gray-color);
    font-size: 1.2rem;
}

.placeholder-result i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.process-arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

.processing-badge {
    background: var(--gradient);
    color: white;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

/* Features Section */
.features-section {
    padding: 4rem 0;
    background: white;
    margin-top: 4rem;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 3rem;
    color: var(--dark-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: #f8fafc;
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--dark-color);
}

/* Footer */
.footer {
    background: var(--dark-color);
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 2rem;
}

.footer-tagline {
    margin: 1rem 0;
    color: var(--gray-color);
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    color: white;
    background: rgba(255, 255, 255, 0.1);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.link-group h4 {
    margin-bottom: 1rem;
    color: white;
}

.link-group a {
    display: block;
    color: var(--gray-color);
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.link-group a:hover {
    color: white;
    padding-left: 5px;
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-color);
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

.footer-bottom .fa-heart {
    color: var(--danger-color);
    margin: 0 5px;
}

/* Loading Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.modal-content {
    background: white;
    padding: 3rem;
    border-radius: var(--radius);
    text-align: center;
    max-width: 400px;
    width: 90%;
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.loader h3 {
    margin: 1rem 0 0.5rem;
    color: var(--dark-color);
}

.loader p {
    color: var(--gray-color);
    margin-bottom: 1.5rem;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid #e5e7eb;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

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

.progress-bar {
    width: 100%;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    margin-top: 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient);
    width: 0%;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .preview-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    
    .process-arrow {
        transform: rotate(90deg);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .nav-menu {
        display: none;
    }
}

/* Add these styles to your existing style.css */

/* Background Replacement Panel */
.bg-replace-panel {
    background: white;
    border-radius: var(--radius);
    padding: 1.5rem;
    margin: 2rem auto;
    max-width: 800px;
    box-shadow: var(--shadow);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    color: var(--dark-color);
    font-size: 1.2rem;
}

.panel-title i {
    color: var(--primary-color);
}

/* Background Options Tabs */
.bg-options-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.bg-tab {
    padding: 0.7rem 1.2rem;
    background: #f8fafc;
    border: 2px solid #e5e7eb;
    border-radius: var(--radius);
    color: var(--dark-color);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.bg-tab:hover {
    background: #f1f5f9;
    border-color: var(--primary-color);
}

.bg-tab.active {
    background: var(--gradient);
    color: white;
    border-color: var(--primary-color);
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

/* Color Picker */
.color-picker-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.color-option {
    background: var(--color);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-height: 80px;
    justify-content: center;
}

.color-option:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.color-option.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.color-option span {
    color: white;
    font-weight: 500;
    font-size: 0.9rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

.color-option[data-color="#ffffff"] span,
.color-option[data-color="#f8fafc"] span {
    color: var(--dark-color);
}

.custom-color-input {
    grid-column: 1 / -1;
    background: #f8fafc;
    padding: 1rem;
    border-radius: 8px;
}

.custom-color-input label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-input-group {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

#customColorPicker {
    width: 50px;
    height: 40px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

#customColor {
    flex: 1;
    padding: 0.5rem;
    border: 2px solid #e5e7eb;
    border-radius: 4px;
    font-family: 'Poppins', sans-serif;
}

#customColor:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Gradient Options */
.gradient-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.gradient-option {
    background: white;
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid #e5e7eb;
}

.gradient-option:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.gradient-option.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.gradient-preview {
    height: 80px;
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.gradient-option span {
    display: block;
    text-align: center;
    font-weight: 500;
    color: var(--dark-color);
}

/* Background Images Grid */
.bg-images-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.bg-image-option {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid #e5e7eb;
}

.bg-image-option:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow);
}

.bg-image-option.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.bg-image-option img {
    width: 100%;
    height: 80px;
    object-fit: cover;
}

.bg-image-option span {
    display: block;
    padding: 0.5rem;
    text-align: center;
    font-size: 0.9rem;
    color: var(--dark-color);
}

/* Custom Background Upload */
.custom-bg-upload {
    text-align: center;
}

.upload-area-small {
    background: #f8fafc;
    border: 2px dashed #e5e7eb;
    border-radius: 8px;
    padding: 2rem 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.upload-area-small:hover {
    border-color: var(--primary-color);
    background: #f1f5f9;
}

.upload-icon-small {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.upload-area-small p {
    color: var(--gray-color);
    margin-bottom: 1rem;
}

.file-info-small {
    margin-top: 1rem;
    padding: 0.5rem;
    background: white;
    border-radius: 4px;
    font-size: 0.9rem;
}

.bg-preview {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
}

.bg-preview h5 {
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.preview-image {
    width: 100%;
    height: 100px;
    background: white;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.preview-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* Background Controls */
.bg-controls {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e5e7eb;
}

.bg-controls label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.slider-container input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    background: #e5e7eb;
    border-radius: 3px;
    outline: none;
}

.slider-container input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.slider-container input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
    transform: scale(1.1);
}

.slider-container span {
    min-width: 40px;
    text-align: center;
    font-weight: 500;
    color: var(--dark-color);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

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

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

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

.btn-danger:hover {
    background: #dc2626;
}

/* Responsive Design for Background Panel */
@media (max-width: 768px) {
    .bg-options-tabs {
        justify-content: center;
    }
    
    .bg-tab {
        flex: 1;
        min-width: 120px;
        justify-content: center;
    }
    
    .color-picker-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .gradient-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .bg-images-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .color-picker-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .gradient-grid,
    .bg-images-grid {
        grid-template-columns: 1fr;
    }
    
    .color-input-group {
        flex-direction: column;
    }
    
    .color-input-group input,
    .color-input-group button {
        width: 100%;
    }
}

/* Preview Grid Layout */
.preview-container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 2rem;
    align-items: center;
    margin-bottom: 2rem;
}

@media (max-width: 768px) {
    .preview-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
    }
    
    .process-arrow {
        transform: rotate(90deg);
    }
}

/* Animation for active states */
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(99, 102, 241, 0); }
    100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

.color-option.active,
.gradient-option.active,
.bg-image-option.active {
    animation: pulse 1.5s infinite;
}

/* File Upload Improvements */
.file-info {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--radius);
    display: none;
}

.file-info.active {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Loading States */
.btn.loading {
    position: relative;
    color: transparent;
}

.btn.loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid white;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
}