/**
 * Background Remover - Stylesheet
 * ================================
 * Modern glassmorphism design with responsive layout.
 * 
 * Author: PromptGallery.in
 */

/* =============================================================================
   CSS Variables / Theme
   ============================================================================= */
:root {
    /* Primary Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --accent-gradient: linear-gradient(135deg, #A259FF 0%, #17D1FF 100%);
    --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    
    /* Colors */
    --accent-purple: #A259FF;
    --accent-cyan: #17D1FF;
    --success-green: #38ef7d;
    --error-red: #ff4757;
    --warning-orange: #ffa502;
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    
    /* Text Colors */
    --text-white: #ffffff;
    --text-light: rgba(255, 255, 255, 0.9);
    --text-muted: rgba(255, 255, 255, 0.7);
    
    /* Spacing */
    --container-max-width: 1000px;
    --card-padding: 40px;
    --card-radius: 24px;
    --btn-radius: 50px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

body.bg-remover-page {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--primary-gradient);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

/* =============================================================================
   Container
   ============================================================================= */
.bg-remover-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

/* =============================================================================
   Header
   ============================================================================= */
.bg-remover-header {
    text-align: center;
    margin-bottom: 30px;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-white);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 20px;
    opacity: 0.9;
    transition: all var(--transition-fast);
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
}

.back-link:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
    transform: translateX(-3px);
}

.bg-remover-header h1 {
    color: var(--text-white);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.bg-remover-header h1 i {
    font-size: 2.2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-remover-header .subtitle {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 500px;
    margin: 0 auto;
}

/* =============================================================================
   Tool Card (Glassmorphism)
   ============================================================================= */
.tool-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--card-radius);
    padding: var(--card-padding);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
}

/* =============================================================================
   Upload Area
   ============================================================================= */
.upload-area {
    border: 3px dashed rgba(255, 255, 255, 0.4);
    border-radius: 20px;
    padding: 60px 40px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.upload-area.drag-over {
    border-color: var(--accent-cyan);
    transform: scale(1.02);
}

.upload-area.drag-over::before {
    opacity: 0.1;
}

.upload-area:hover {
    border-color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.08);
}

.upload-area.hidden {
    display: none;
}

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

.upload-icon {
    font-size: 4rem;
    color: var(--text-white);
    margin-bottom: 20px;
    opacity: 0.8;
    transition: transform var(--transition-normal);
}

.upload-area:hover .upload-icon {
    transform: translateY(-5px);
}

.upload-area h3 {
    color: var(--text-white);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.upload-area .upload-hint {
    color: var(--text-muted);
    margin-bottom: 20px;
    font-size: 1rem;
}

.upload-formats {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.format-badge {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-white);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Upload Button */
.upload-btn {
    background: var(--accent-gradient);
    color: var(--text-white);
    padding: 14px 32px;
    border: none;
    border-radius: var(--btn-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.upload-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(162, 89, 255, 0.4);
}

.upload-btn:active {
    transform: translateY(-1px);
}

.file-input {
    display: none;
}

/* =============================================================================
   Preview Section
   ============================================================================= */
.preview-section {
    display: none;
    margin-top: 30px;
    animation: fadeIn 0.4s ease;
}

.preview-section.active {
    display: block;
}

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

/* Preview Header */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.preview-header h3 {
    color: var(--text-white);
    font-size: 1.3rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.preview-header h3 i {
    color: var(--accent-cyan);
}

/* =============================================================================
   Action Buttons
   ============================================================================= */
.action-buttons {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--btn-radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(162, 89, 255, 0.4);
}

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

.btn-success:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(56, 239, 125, 0.3);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-white);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.25);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

/* =============================================================================
   Image Comparison
   ============================================================================= */
.comparison-container {
    position: relative;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
}

.comparison-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px;
}

.image-container {
    position: relative;
    /* Checkerboard pattern for transparency preview */
    background: repeating-conic-gradient(#e0e0e0 0% 25%, #ffffff 0% 50%) 50% / 20px 20px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.image-container img {
    max-width: 100%;
    max-height: 500px;
    height: auto;
    display: block;
    object-fit: contain;
}

.image-container.empty {
    background: rgba(0, 0, 0, 0.3);
}

.image-container.empty::after {
    content: 'Result will appear here';
    color: var(--text-muted);
    font-size: 0.9rem;
}

.image-label {
    position: absolute;
    top: 15px;
    left: 15px;
    background: rgba(0, 0, 0, 0.75);
    color: var(--text-white);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    backdrop-filter: blur(5px);
}

.image-label.result {
    background: var(--accent-gradient);
}

/* =============================================================================
   Progress Overlay
   ============================================================================= */
.progress-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    z-index: 10;
}

.progress-overlay.active {
    display: flex;
}

.progress-content {
    text-align: center;
    color: var(--text-white);
    padding: 20px;
}

/* Spinner */
.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--accent-cyan);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.progress-text {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.progress-subtext {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* =============================================================================
   Toast / Messages
   ============================================================================= */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: rgba(0, 0, 0, 0.9);
    color: var(--text-white);
    padding: 16px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
    backdrop-filter: blur(10px);
    max-width: 400px;
}

.toast.error {
    background: rgba(255, 71, 87, 0.95);
    border-left: 4px solid var(--error-red);
}

.toast.success {
    background: rgba(17, 153, 142, 0.95);
    border-left: 4px solid var(--success-green);
}

.toast.warning {
    background: rgba(255, 165, 2, 0.95);
    border-left: 4px solid var(--warning-orange);
}

.toast i {
    font-size: 1.2rem;
    flex-shrink: 0;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideOut {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast.removing {
    animation: slideOut 0.3s ease forwards;
}

/* =============================================================================
   Features Section
   ============================================================================= */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.feature {
    background: rgba(255, 255, 255, 0.08);
    padding: 24px 20px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
}

.feature:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateY(-3px);
}

.feature i {
    font-size: 2.2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.feature h4 {
    color: var(--text-white);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature p {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.5;
}

/* =============================================================================
   How It Works Section
   ============================================================================= */
.how-it-works {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.how-it-works h3 {
    color: var(--text-white);
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 24px;
}

.steps {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.step {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-light);
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--accent-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    flex-shrink: 0;
}

.step-text {
    font-size: 0.95rem;
}

/* =============================================================================
   Responsive Design
   ============================================================================= */

/* Tablet */
@media (max-width: 768px) {
    body.bg-remover-page {
        padding: 15px;
    }
    
    .tool-card {
        padding: 25px;
    }
    
    .bg-remover-header h1 {
        font-size: 1.8rem;
        flex-direction: column;
        gap: 10px;
    }
    
    .bg-remover-header h1 i {
        font-size: 2rem;
    }
    
    .bg-remover-header .subtitle {
        font-size: 1rem;
    }
    
    .upload-area {
        padding: 40px 20px;
    }
    
    .upload-icon {
        font-size: 3rem;
    }
    
    .upload-area h3 {
        font-size: 1.2rem;
    }
    
    .preview-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .preview-header h3 {
        font-size: 1.1rem;
        justify-content: center;
    }
    
    .action-buttons {
        width: 100%;
        justify-content: center;
    }
    
    .btn {
        flex: 1;
        justify-content: center;
        font-size: 0.85rem;
        padding: 12px 16px;
    }
    
    .comparison-wrapper {
        grid-template-columns: 1fr;
    }
    
    .image-container {
        min-height: 250px;
    }
    
    .features {
        grid-template-columns: 1fr 1fr;
        gap: 15px;
    }
    
    .feature {
        padding: 20px 15px;
    }
    
    .steps {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .tool-card {
        padding: 20px 15px;
        border-radius: 20px;
    }
    
    .bg-remover-header h1 {
        font-size: 1.5rem;
    }
    
    .bg-remover-header .subtitle {
        font-size: 0.9rem;
    }
    
    .upload-area {
        padding: 30px 15px;
        border-radius: 16px;
    }
    
    .upload-icon {
        font-size: 2.5rem;
        margin-bottom: 15px;
    }
    
    .upload-area h3 {
        font-size: 1.1rem;
    }
    
    .upload-area .upload-hint {
        font-size: 0.85rem;
    }
    
    .upload-formats {
        gap: 6px;
    }
    
    .format-badge {
        padding: 5px 10px;
        font-size: 0.75rem;
    }
    
    .upload-btn {
        width: 100%;
        justify-content: center;
        padding: 14px 24px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .toast {
        left: 15px;
        right: 15px;
        max-width: none;
    }
}

/* Extra small devices */
@media (max-width: 360px) {
    body.bg-remover-page {
        padding: 10px;
    }
    
    .tool-card {
        padding: 15px 12px;
    }
    
    .bg-remover-header h1 {
        font-size: 1.3rem;
    }
}