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

:root {
    --bg: #ffffff;
    --surface: #f8f9fa;
    --border: #e9ecef;
    --text: #212529;
    --text-muted: #6c757d;
    --primary: #4F46E5;
    --primary-hover: #4338CA;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-muted);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.tab {
    background: none;
    border: none;
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    cursor: pointer;
    position: relative;
    transition: color 0.2s;
}

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

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

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Generate Tab */
.controls {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    margin-bottom: 2rem;
}

.control-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

.color-input {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

input[type="color"] {
    width: 48px;
    height: 36px;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    cursor: pointer;
}

input[type="text"] {
    flex: 1;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
}

select {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    background: white;
}

input[type="range"] {
    width: 100%;
    margin-top: 0.5rem;
}

#colorCountValue {
    display: inline-block;
    margin-left: 0.5rem;
    font-weight: 600;
}

.generate-btn {
    width: 100%;
    padding: 0.75rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.generate-btn:hover {
    background: var(--primary-hover);
}

/* Palette Display */
.palette-display {
    min-height: 200px;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

.empty-state svg {
    opacity: 0.5;
    margin-bottom: 1rem;
}

.palette {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1rem;
}

.color-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.color-preview {
    height: 120px;
    position: relative;
}

.color-info {
    padding: 1rem;
    background: white;
}

.color-hex {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.color-rgb {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.color-actions {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    display: flex;
    gap: 0.25rem;
    opacity: 0;
    transition: opacity 0.2s;
}

.color-card:hover .color-actions {
    opacity: 1;
}

.color-actions button {
    background: rgba(255, 255, 255, 0.9);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 0.375rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.color-actions button:hover {
    background: white;
}

/* Extract Tab */
.upload-area {
    border: 2px dashed var(--border);
    border-radius: 0.75rem;
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

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

.upload-area.dragover {
    border-color: var(--primary);
    background: var(--surface);
}

.upload-area svg {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-btn {
    margin-top: 1rem;
    padding: 0.5rem 1.5rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.upload-btn:hover {
    background: var(--primary-hover);
}

.extract-result {
    text-align: center;
}

#previewImage {
    max-width: 100%;
    max-height: 400px;
    border-radius: 0.75rem;
    margin-bottom: 2rem;
}

.extracted-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.extracted-color {
    aspect-ratio: 1;
    border-radius: 0.5rem;
    cursor: pointer;
    position: relative;
    transition: transform 0.2s;
}

.extracted-color:hover {
    transform: scale(1.1);
}

.extracted-color span {
    position: absolute;
    bottom: -1.5rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.reset-btn {
    padding: 0.5rem 1.5rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.reset-btn:hover {
    background: var(--border);
}

/* Saved Tab */
.saved-palettes {
    display: grid;
    gap: 1rem;
}

.saved-palette {
    background: var(--surface);
    padding: 1rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.saved-palette-colors {
    display: flex;
    gap: 0.5rem;
}

.saved-color {
    width: 40px;
    height: 40px;
    border-radius: 0.375rem;
    border: 1px solid var(--border);
}

.saved-palette-info {
    flex: 1;
}

.saved-palette-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.saved-palette-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.saved-palette-actions {
    display: flex;
    gap: 0.5rem;
}

.saved-palette-actions button {
    padding: 0.375rem 0.75rem;
    background: white;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.2s;
}

.saved-palette-actions button:hover {
    background: var(--surface);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    opacity: 0;
    transition: all 0.3s;
    z-index: 1000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 2rem;
    border-radius: 0.75rem;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.375rem;
    transition: background 0.2s;
}

.close-btn:hover {
    background: var(--surface);
}

.export-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.export-options button {
    padding: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.export-options button:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

#exportPreview {
    background: var(--surface);
    padding: 1rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    font-family: monospace;
    overflow-x: auto;
}

/* Responsive */
@media (max-width: 640px) {
    .container {
        padding: 1rem;
    }
    
    .control-row {
        grid-template-columns: 1fr;
    }
    
    .tabs {
        gap: 0.5rem;
    }
    
    .tab {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }
}