/* CSS Variables - TechTools Theme */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a2e;
    --bg-hover: #232338;
    --border-color: #2a2a40;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-hover: #818cf8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left, .header-right {
    flex: 1;
}

.header-right {
    display: flex;
    justify-content: flex-end;
}

.header-center {
    flex: 2;
    text-align: center;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.header h1 i {
    color: var(--accent-primary);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 0.9rem;
}

.back-btn:hover {
    color: var(--text-primary);
    background: var(--bg-hover);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--bg-hover);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.8rem;
}

/* Main Content */
.main-content {
    display: grid;
    grid-template-columns: 300px 1fr 280px;
    gap: 1.5rem;
    padding: 1.5rem 2rem;
    flex: 1;
}

/* Panels */
.control-panel, .info-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.panel-section {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border-color);
}

.panel-section h3 {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.panel-section h3 i {
    color: var(--accent-primary);
}

/* Source Tabs */
.source-tabs {
    display: flex;
    gap: 0.5rem;
}

.source-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 0.75rem 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.75rem;
}

.source-tab i {
    font-size: 1.1rem;
}

.source-tab:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.source-tab.active {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-color: transparent;
    color: white;
}

/* Form Groups */
.form-group {
    margin-bottom: 1rem;
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-group input[type="text"],
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input[type="text"]:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group input[type="range"] {
    width: 100%;
    accent-color: var(--accent-primary);
}

/* Color Input */
.color-input-wrapper {
    display: flex;
    gap: 0.5rem;
}

.color-input-wrapper input[type="color"] {
    width: 44px;
    height: 38px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: var(--bg-secondary);
}

.color-input-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 2px;
}

.color-input-wrapper input[type="color"]::-webkit-color-swatch {
    border-radius: 4px;
    border: none;
}

.color-input-wrapper input[type="text"] {
    flex: 1;
    font-family: monospace;
}

/* Hidden Sections */
.source-section.hidden {
    display: none;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

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

.upload-area i {
    font-size: 2rem;
    color: var(--accent-primary);
    margin-bottom: 0.75rem;
}

.upload-area p {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

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

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

.image-preview img {
    max-width: 100%;
    max-height: 120px;
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
}

.image-preview.hidden {
    display: none;
}

/* Emoji Picker */
.emoji-picker {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.375rem;
}

.emoji-btn {
    padding: 0.5rem;
    font-size: 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.emoji-btn:hover {
    border-color: var(--accent-primary);
    transform: scale(1.1);
}

/* Shape Options */
.shape-options {
    display: flex;
    gap: 0.75rem;
}

.shape-btn {
    flex: 1;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: center;
}

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

.shape-btn.active {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.shape-preview {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.shape-preview.square {
    border-radius: 0;
}

.shape-preview.rounded {
    border-radius: 6px;
}

.shape-preview.circle {
    border-radius: 50%;
}

/* Preset Grid */
.preset-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.preset-btn {
    width: 100%;
    aspect-ratio: 1;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.preset-btn:hover {
    transform: scale(1.1);
    border-color: white;
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.preview-header {
    text-align: center;
}

.preview-header h2 {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.preview-large {
    display: flex;
    justify-content: center;
}

.preview-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
}

.preview-card canvas {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
}

.preview-label {
    display: block;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Size Previews */
.preview-sizes {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.size-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.size-preview canvas {
    border-radius: 4px;
}

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

/* Browser Mockup */
.browser-mockup {
    background: var(--bg-card);
    border-radius: 6px;
    padding: 6px 10px;
    display: flex;
    align-items: center;
}

.browser-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-secondary);
    padding: 4px 12px 4px 6px;
    border-radius: 4px 4px 0 0;
}

.browser-tab span {
    font-size: 11px;
    color: var(--text-secondary);
}

.browser-mockup.bookmark {
    padding: 10px;
    border-radius: var(--radius-sm);
}

/* Download Section */
.download-section {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.download-section h3 {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.download-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.375rem;
    padding: 0.875rem 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.75rem;
}

.download-btn i {
    font-size: 1.1rem;
    color: var(--accent-primary);
}

.download-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(99, 102, 241, 0.1);
}

.download-btn.ico-btn {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
}

.download-btn.svg-btn {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(52, 211, 153, 0.2));
}

.download-btn.svg-btn i {
    color: var(--success);
}

/* Info Panel */
.instructions-list {
    list-style: none;
    counter-reset: step;
}

.instructions-list li {
    counter-increment: step;
    padding: 0.5rem 0;
    padding-left: 2rem;
    position: relative;
    font-size: 0.85rem;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.instructions-list li:last-child {
    border-bottom: none;
}

.instructions-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    width: 20px;
    height: 20px;
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.files-list {
    list-style: none;
}

.files-list li {
    padding: 0.375rem 0;
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.files-list li::before {
    content: "•";
    color: var(--accent-primary);
}

.files-list code {
    background: var(--bg-secondary);
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
    font-size: 0.75rem;
    color: var(--accent-primary);
}

/* Code Block */
.code-block {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.code-block pre {
    padding: 1rem;
    overflow-x: auto;
    font-size: 0.7rem;
    line-height: 1.6;
}

.code-block code {
    color: var(--text-secondary);
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.375rem 0.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Responsive */
@media (max-width: 1200px) {
    .main-content {
        grid-template-columns: 280px 1fr;
    }

    .info-panel {
        display: none;
    }
}

@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        padding: 1rem;
    }

    .control-panel {
        order: 2;
    }

    .preview-section {
        order: 1;
    }

    .download-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .header {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.2rem;
    }

    .header-left span, .header-right span {
        display: none;
    }
}

@media (max-width: 480px) {
    .preview-sizes {
        gap: 1rem;
    }

    .source-tabs {
        flex-wrap: wrap;
    }

    .shape-options {
        justify-content: center;
    }

    .preset-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}