/* ============================================
   ICNS to ICO Converter - Windows Theme
   With Dark Mode Support
   Windows Blue: #0078D4 | Orange: #FF8C00
   ============================================ */

:root {
    /* Windows Brand Colors */
    --win-blue: #0078D4;
    --win-blue-dark: #005A9E;
    --win-blue-light: #1E90FF;
    --win-cyan: #00B7C3;
    --win-purple: #8764B8;
    --win-pink: #E3008C;
    --win-green: #107C10;
    --win-orange: #FF8C00;
    
    /* Light Mode Colors */
    --win-gray: #6E6E6E;
    --win-gray-light: #F3F3F3;
    --win-gray-dark: #1A1A1A;
    --win-bg: #F3F3F3;
    --white: #FFFFFF;
    
    /* Component Colors - Light Mode */
    --tool-bg: #FFFFFF;
    --card-bg: #F3F3F3;
    --input-bg: #FFFFFF;
    --border-color: #E1E1E1;
    --border-light: #F0F0F0;
    --text-primary: #1A1A1A;
    --text-secondary: #6E6E6E;
    --text-muted: #A0A0A0;
    
    /* Interactive Elements */
    --hover-bg: rgba(0, 120, 212, 0.05);
    --active-bg: rgba(0, 120, 212, 0.1);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    
    /* Misc */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition: all 0.3s ease;
    
    /* Windows mockups */
    --taskbar-bg: #1A1A1A;
    --taskbar-item-bg: rgba(255, 255, 255, 0.1);
    --desktop-bg: #F3F3F3;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
    --win-gray: #9E9E9E;
    --win-gray-light: #2D2D2D;
    --win-gray-dark: #F3F3F3;
    --win-bg: #1A1A1A;
    --white: #2D2D2D;
    
    /* Component Colors - Dark Mode */
    --tool-bg: #2D2D2D;
    --card-bg: #3D3D3D;
    --input-bg: #3D3D3D;
    --border-color: #4D4D4D;
    --border-light: #3D3D3D;
    --text-primary: #F3F3F3;
    --text-secondary: #9E9E9E;
    --text-muted: #6E6E6E;
    
    /* Interactive Elements */
    --hover-bg: rgba(0, 120, 212, 0.15);
    --active-bg: rgba(0, 120, 212, 0.25);
    
    /* Shadows - darker for dark mode */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
    
    /* Windows mockups */
    --taskbar-bg: #1A1A1A;
    --taskbar-item-bg: rgba(255, 255, 255, 0.15);
    --desktop-bg: #2D2D2D;
}

/* ============================================
   TOOL CONTAINER
   ============================================ */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 30px 20px;
}

/* ============================================
   HEADER SECTION
   ============================================ */
.tool-header {
    text-align: center;
    margin-bottom: 30px;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 15px;
}

.tool-icon-wrapper {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
}

.tool-icon-wrapper.win-theme {
    background: linear-gradient(135deg, var(--win-blue), var(--win-cyan));
    box-shadow: 0 4px 15px rgba(0, 120, 212, 0.3);
}

.tool-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    transition: color var(--transition);
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto;
    line-height: 1.6;
    transition: color var(--transition);
}

/* ============================================
   MAIN TOOL AREA
   ============================================ */
.tool-main {
    background: var(--tool-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 3rem;
    margin-bottom: 30px;
    transition: background-color var(--transition), box-shadow var(--transition);
}

/* ============================================
   UPLOAD SECTION
   ============================================ */
.upload-section {
    margin-bottom: 25px;
}

.upload-area {
    border: 2px dashed var(--win-blue);
    border-radius: var(--radius-md);
    padding: 50px 30px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.02), rgba(0, 183, 195, 0.02));
}

[data-theme="dark"] .upload-area {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.05), rgba(0, 183, 195, 0.05));
}

.upload-area:hover {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.05), rgba(0, 183, 195, 0.05));
    border-color: var(--win-blue-light);
}

[data-theme="dark"] .upload-area:hover {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.1), rgba(0, 183, 195, 0.1));
}

.upload-area.drag-over {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.1), rgba(0, 183, 195, 0.1));
    border-color: var(--win-blue);
    border-style: solid;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.upload-icon {
    color: var(--win-blue);
    opacity: 0.8;
}

.upload-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    transition: color var(--transition);
}

.upload-subtitle {
    color: var(--text-secondary);
    margin: 0;
    transition: color var(--transition);
}

.upload-hint {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 10px;
    transition: color var(--transition);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--win-blue), var(--win-blue-dark));
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.3);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 120, 212, 0.4);
}

.btn-primary:disabled {
    background: var(--win-gray);
    box-shadow: none;
    cursor: not-allowed;
}

.btn-secondary {
    background: var(--card-bg);
    color: var(--text-primary);
    transition: background-color var(--transition), color var(--transition);
}

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

.btn-browse {
    margin-top: 10px;
}

/* ============================================
   EDITOR SECTION
   ============================================ */
.editor-section {
    animation: fadeIn 0.4s ease;
}

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

/* ============================================
   PREVIEW PANEL
   ============================================ */
.preview-panel {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 25px;
    transition: background-color var(--transition);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}

.panel-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    transition: color var(--transition);
}

.panel-header .file-info {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background: var(--tool-bg);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), color var(--transition);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

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

.preview-mock {
    background: var(--tool-bg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    padding: 15px;
    margin-bottom: 10px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition), box-shadow var(--transition);
}

/* Windows Taskbar Preview */
.taskbar-window {
    width: 100%;
    background: var(--desktop-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    min-height: 80px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    transition: background-color var(--transition);
}

.taskbar-bar {
    background: var(--taskbar-bg);
    padding: 4px 8px;
    display: flex;
    justify-content: center;
}

.taskbar-items {
    display: flex;
    gap: 4px;
    align-items: center;
}

.taskbar-item {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition);
}

.taskbar-item.placeholder {
    background: var(--taskbar-item-bg);
}

.taskbar-item.active {
    background: var(--taskbar-item-bg);
    position: relative;
}

.taskbar-item.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 3px;
    background: var(--win-blue);
    border-radius: 2px;
}

.taskbar-item img {
    width: 24px;
    height: 24px;
    border-radius: 2px;
}

/* Desktop Icon Preview */
.desktop-icon {
    background: var(--desktop-bg);
    transition: background-color var(--transition);
}

.desktop-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    padding: 10px;
}

.desktop-item img {
    width: 48px;
    height: 48px;
    border-radius: 2px;
}

.desktop-item span {
    font-size: 12px;
    color: var(--text-primary);
    transition: color var(--transition);
}

/* Source Info Preview */
.source-info {
    flex-direction: column;
    padding: 20px;
}

.source-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
    width: 100%;
}

.source-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: color var(--transition);
}

.source-item strong {
    color: var(--win-blue);
}

.preview-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition);
}

/* ============================================
   OPTIONS GRID
   ============================================ */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 25px;
}

.option-card {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: background-color var(--transition);
}

.option-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--text-primary);
    transition: color var(--transition);
}

.option-header h4 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

/* Preset Buttons */
.preset-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 15px;
}

.preset-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--tool-bg);
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.preset-btn:hover {
    border-color: var(--win-blue);
    color: var(--win-blue);
}

.preset-btn.active {
    background: var(--win-blue);
    border-color: var(--win-blue);
    color: #FFFFFF;
}

/* Size Checkboxes */
.size-checkboxes {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 10px;
}

.size-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--tool-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.size-checkbox:hover {
    border-color: var(--win-blue);
}

.size-checkbox input {
    display: none;
}

.size-checkbox input:checked + .checkbox-mark {
    background: var(--win-blue);
    border-color: var(--win-blue);
}

.size-checkbox input:checked + .checkbox-mark::after {
    display: block;
}

.size-checkbox input:checked ~ span:last-child {
    color: var(--win-blue);
    font-weight: 600;
}

.checkbox-mark {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-radius: 2px;
    position: relative;
    transition: var(--transition);
}

.checkbox-mark::after {
    content: '';
    position: absolute;
    display: none;
    left: 4px;
    top: 1px;
    width: 4px;
    height: 8px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.size-info {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 5px;
    transition: color var(--transition);
}

/* Windows Options */
.win-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 15px;
}

.checkbox-option {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-option input {
    display: none;
}

.checkbox-option input:checked + .checkbox-mark {
    background: var(--win-blue);
    border-color: var(--win-blue);
}

.checkbox-option input:checked + .checkbox-mark::after {
    display: block;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: color var(--transition);
}

/* Bit Depth Option */
.bit-depth-option {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--border-light);
    transition: border-color var(--transition);
}

.bit-depth-option label {
    font-size: 0.9rem;
    color: var(--text-primary);
    white-space: nowrap;
    transition: color var(--transition);
}

.bit-depth-option select {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    font-size: 0.9rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.bit-depth-option select:focus {
    outline: none;
    border-color: var(--win-blue);
}

/* Radio Options (Scaling) */
.scaling-options,
.color-options {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.radio-option:hover {
    background: var(--hover-bg);
}

.radio-option input {
    display: none;
}

.radio-mark {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    position: relative;
    transition: var(--transition);
    flex-shrink: 0;
}

.radio-option input:checked + .radio-mark {
    border-color: var(--win-blue);
}

.radio-option input:checked + .radio-mark::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--win-blue);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.radio-label {
    display: flex;
    flex-direction: column;
}

.radio-label strong {
    font-size: 0.9rem;
    color: var(--text-primary);
    transition: color var(--transition);
}

.radio-label small {
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: color var(--transition);
}

/* Enhancement Options */
.enhancement-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* ============================================
   ACTION BAR
   ============================================ */
.action-bar {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
}

/* ============================================
   PROGRESS
   ============================================ */
.progress-container {
    margin-top: 20px;
    text-align: center;
}

.progress-bar {
    height: 8px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: 10px;
    transition: background-color var(--transition);
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--win-blue), var(--win-cyan));
    border-radius: var(--radius-sm);
    transition: width 0.3s ease;
    width: 0%;
}

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

/* ============================================
   RESULTS SECTION
   ============================================ */
.results-section {
    text-align: center;
    padding: 30px 0;
}

.result-success {
    margin-bottom: 25px;
}

.result-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--win-green), #2D9D2D);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    color: #FFFFFF;
}

.result-title {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin: 0 0 5px;
    transition: color var(--transition);
}

.result-subtitle {
    color: var(--text-secondary);
    margin: 0;
    transition: color var(--transition);
}

.download-btn {
    background: linear-gradient(135deg, var(--win-green), #2D9D2D);
    color: #FFFFFF;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 4px 15px rgba(16, 124, 16, 0.3);
    transition: var(--transition);
    margin-bottom: 20px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 124, 16, 0.4);
    color: #FFFFFF;
}

.result-details {
    display: flex;
    justify-content: center;
    gap: 30px;
    padding-top: 15px;
    border-top: 1px solid var(--border-light);
    transition: border-color var(--transition);
}

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

.result-detail span {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
    transition: color var(--transition);
}

.result-detail strong {
    font-size: 1rem;
    color: var(--text-primary);
    transition: color var(--transition);
}

/* ============================================
   ERROR MESSAGE
   ============================================ */
.error-message {
    background: rgba(232, 17, 35, 0.1);
    color: #E81123;
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

[data-theme="dark"] .error-message {
    background: rgba(232, 17, 35, 0.2);
}

/* ============================================
   RELATED TOOLS
   ============================================ */
.related-tools {
    background: var(--tool-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    transition: background-color var(--transition), box-shadow var(--transition);
}

.related-label {
    font-weight: 600;
    color: var(--text-primary);
    transition: color var(--transition);
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

.related-link:hover {
    background: var(--win-blue);
    color: #FFFFFF;
}

/* ============================================
   INFO SECTIONS
   ============================================ */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.info-card {
    background: var(--tool-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 30px;
    position: relative;
    overflow: hidden;
    transition: background-color var(--transition), box-shadow var(--transition);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.3rem;
    color: var(--text-primary);
    margin: 0 0 20px;
    transition: color var(--transition);
}

/* ============================================
   STEPS LIST
   ============================================ */
.steps-list {
    counter-reset: step;
    list-style: none;
    padding: 0;
    margin: 0;
}

.steps-list li {
    position: relative;
    padding-left: 50px;
    margin-bottom: 18px;
    counter-increment: step;
    line-height: 1.6;
    color: var(--text-primary);
    transition: color var(--transition);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    background: var(--win-blue);
    color: #FFFFFF;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
}

.steps-list li:last-child {
    margin-bottom: 0;
}

/* ============================================
   TIPS GRID
   ============================================ */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.tip-item {
    display: flex;
    gap: 15px;
}

.tip-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: #FFFFFF;
}

.tip-icon.win-blue {
    background: linear-gradient(135deg, var(--win-blue), var(--win-cyan));
}

.tip-icon.win-purple {
    background: linear-gradient(135deg, var(--win-purple), #A78BFA);
}

.tip-icon.win-green {
    background: linear-gradient(135deg, var(--win-green), #2D9D2D);
}

.tip-icon.win-orange {
    background: linear-gradient(135deg, var(--win-orange), #FFA500);
}

.tip-content h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: 0 0 5px;
    transition: color var(--transition);
}

.tip-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.5;
    transition: color var(--transition);
}

.tip-content a {
    color: var(--win-blue);
    text-decoration: none;
}

.tip-content a:hover {
    text-decoration: underline;
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-table {
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: border-color var(--transition);
}

.comparison-row {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
}

.comparison-row.header {
    background: var(--card-bg);
    font-weight: 600;
    transition: background-color var(--transition);
}

.comparison-row:not(.header):nth-child(odd) {
    background: var(--hover-bg);
}

.comparison-cell {
    padding: 12px 15px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    transition: color var(--transition), border-color var(--transition);
}

.comparison-row:last-child .comparison-cell {
    border-bottom: none;
}

.comparison-cell.icns {
    text-align: center;
    color: #007AFF;
}

.comparison-cell.ico {
    text-align: center;
    color: var(--win-orange);
}

.comparison-row.header .comparison-cell.icns,
.comparison-row.header .comparison-cell.ico {
    color: var(--text-primary);
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.faq-item {
    background: var(--card-bg);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: background-color var(--transition);
}

.faq-question {
    width: 100%;
    padding: 15px 20px;
    background: transparent;
    border: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--win-blue);
}

.faq-question svg {
    transition: transform 0.3s ease;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.faq-item.open .faq-question svg {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 20px 15px;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
    transition: color var(--transition);
}

.faq-answer a {
    color: var(--win-blue);
    text-decoration: none;
}

.faq-answer a:hover {
    text-decoration: underline;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
    .tool-container {
        padding: 20px 15px;
    }
    
    .tool-title {
        font-size: 1.8rem;
    }
    
    .tool-main {
        padding: 20px;
    }
    
    .upload-area {
        padding: 35px 20px;
    }
    
    .options-grid {
        grid-template-columns: 1fr;
    }
    
    .action-bar {
        flex-direction: column;
    }
    
    .action-bar .btn {
        width: 100%;
    }
    
    .related-tools {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .result-details {
        flex-direction: column;
        gap: 15px;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .tip-item {
        flex-direction: column;
        text-align: center;
    }
    
    .tip-icon {
        margin: 0 auto;
    }
    
    .comparison-row {
        grid-template-columns: 1fr;
    }
    
    .comparison-cell {
        text-align: left !important;
    }
    
    .comparison-row.header {
        display: none;
    }
    
    .comparison-cell::before {
        font-weight: 600;
        display: block;
        margin-bottom: 5px;
    }
    
    .comparison-cell.icns::before {
        content: 'ICNS (macOS): ';
    }
    
    .comparison-cell.ico::before {
        content: 'ICO (Windows): ';
    }
}

@media (max-width: 480px) {
    .preset-buttons {
        flex-direction: column;
    }
    
    .preset-btn {
        width: 100%;
        justify-content: center;
    }
    
    .size-checkboxes {
        flex-direction: column;
    }
    
    .size-checkbox {
        width: 100%;
        justify-content: flex-start;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    .btn:hover,
    .download-btn:hover,
    .related-link:hover {
        transform: none;
    }
    
    .faq-question svg,
    .progress {
        transition: none;
    }
    
    * {
        transition-duration: 0.01ms !important;
    }
}