/* Grayscale Image Converter - Fully Responsive */

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700;800&display=swap');

.grayscale-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
    font-family: 'Poppins', sans-serif;
}

.grayscale-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.grayscale-title {
    font-size: 3rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text);
}

.grayscale-icon {
    font-size: 2.8rem;
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.grayscale-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.grayscale-card {
    background: var(--surface);
    border-radius: var(--radius, 20px);
    border: 1px solid var(--border);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

/* Upload Area */
.upload-area {
    border: 3px dashed var(--border);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-area:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.upload-btn {
    margin-top: 1.5rem;
    padding: 0.8rem 2rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Editor Area */
.editor-area {
    margin-top: 1rem;
}

/* Side by Side Layout */
.editor-side-by-side {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.original-column,
.processed-column {
    flex: 1;
    background: var(--bg);
    border-radius: 16px;
    padding: 1rem;
    border: 1px solid var(--border);
}

.column-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary);
}

.column-icon {
    font-size: 1.3rem;
}

.column-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin: 0;
}

.image-container {
    text-align: center;
}

.preview-canvas {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    background: var(--bg);
}

.image-info {
    margin-top: 0.8rem;
    font-size: 0.8rem;
    color: var(--text-light);
    text-align: center;
}

/* Control Panel */
.control-panel {
    background: var(--bg);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid var(--border);
}

.control-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
}

.control-tab {
    background: transparent;
    border: none;
    color: var(--text-light);
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
}

.control-tab:hover {
    color: var(--primary);
}

.control-tab.active {
    background: var(--primary);
    color: white;
}

.controls-container {
    margin-bottom: 1.5rem;
}

.effect-controls {
    display: none;
    animation: fadeIn 0.3s ease;
}

.effect-controls.active {
    display: block;
}

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

.control-group {
    margin-bottom: 1rem;
}

.control-group label {
    display: block;
    margin-bottom: 0.4rem;
    color: var(--text-light);
    font-size: 0.85rem;
    font-weight: 500;
}

.effect-slider {
    width: 100%;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    -webkit-appearance: none;
}

.effect-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--surface);
    box-shadow: 0 0 5px var(--primary);
}

.effect-select {
    width: 100%;
    padding: 0.6rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.85rem;
    cursor: pointer;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
}

.checkbox-label span {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
    flex-wrap: wrap;
}

.action-btn {
    padding: 0.7rem 1.5rem;
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
    border-radius: 30px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
}

.action-btn.primary {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: white;
    border: none;
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.action-btn.primary:hover {
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Presets */
.grayscale-presets {
    margin: 2rem 0;
    text-align: center;
}

.grayscale-presets h3 {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
}

.preset-btn {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-light);
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
}

.preset-btn:hover {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
}

/* Tips Section */
.grayscale-tips {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(143, 109, 255, 0.1));
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin: 1.5rem 0;
    text-align: center;
}

.grayscale-tips h3 {
    color: var(--text);
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

.grayscale-tips p {
    color: var(--text-light);
    font-size: 0.85rem;
    margin: 0;
}

/* SEO Section */
.grayscale-seo {
    margin: 2rem 0;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

.grayscale-seo h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text);
}

.grayscale-seo h3 {
    font-size: 1.1rem;
    margin: 1rem 0 0.5rem;
    color: var(--text);
}

.grayscale-seo p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 0.9rem;
}

.grayscale-howto-list,
.grayscale-features-list {
    padding-left: 1.2rem;
    margin: 0.5rem 0;
}

.grayscale-howto-list li,
.grayscale-features-list li {
    color: var(--text-light);
    margin-bottom: 0.3rem;
    font-size: 0.85rem;
}

.grayscale-features-list {
    list-style: none;
    padding: 0;
}

.grayscale-features-list li {
    padding-left: 1.5rem;
    position: relative;
}

.grayscale-features-list li::before {
    content: '✓';
    color: var(--primary);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Messages */
.grayscale-message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px 20px;
    border-radius: 30px;
    font-weight: 500;
    font-size: 0.85rem;
    animation: slideIn 0.3s ease;
    z-index: 1000;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.grayscale-message-success {
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
}

.grayscale-message-error {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
}

.grayscale-message-info {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

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

/* Responsive */
@media screen and (min-width: 768px) {
    .editor-side-by-side {
        flex-direction: row;
    }
}

@media screen and (max-width: 767px) {
    .grayscale-container {
        padding: 0 1rem;
    }
    
    .grayscale-title {
        font-size: 2rem;
    }
    
    .grayscale-icon {
        font-size: 1.8rem;
    }
    
    .grayscale-card {
        padding: 1rem;
    }
    
    .editor-side-by-side {
        flex-direction: column;
        gap: 1rem;
    }
    
    .original-column,
    .processed-column {
        width: 100%;
    }
    
    .control-tabs {
        justify-content: center;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
        text-align: center;
    }
    
    .preset-buttons {
        gap: 0.6rem;
    }
    
    .preset-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.75rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 4px;
}