/* ============================================
   ICNS FILE VIEWER - Apple-Inspired Teal Theme
   ConvertICO.com
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Primary Colors - Teal/Cyan for Apple feel */
    --primary: #0d9488;
    --primary-light: #14b8a6;
    --primary-dark: #0f766e;
    --primary-bg: rgba(13, 148, 136, 0.1);
    --primary-bg-hover: rgba(13, 148, 136, 0.15);
    
    /* Secondary Colors */
    --secondary: #64748b;
    --secondary-light: #94a3b8;
    --secondary-dark: #475569;
    
    /* Background Colors */
    --bg-body: #f0fdfa;
    --bg-card: #ffffff;
    --bg-card-secondary: #f0fdfa;
    --bg-card-tertiary: #ccfbf1;
    --bg-input: #ffffff;
    --bg-code: #1e293b;
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Border Colors */
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --border-focus: var(--primary);
    
    /* Status Colors */
    --success: #10b981;
    --success-bg: #d1fae5;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --error: #ef4444;
    --error-bg: #fee2e2;
    --info: #0ea5e9;
    --info-bg: #e0f2fe;
    
    /* Size Badge Colors */
    --size-16: #10b981;
    --size-32: #0ea5e9;
    --size-64: #8b5cf6;
    --size-128: #f59e0b;
    --size-256: #ec4899;
    --size-512: #ef4444;
    --size-1024: #6366f1;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================
   DARK MODE
   ============================================ */
[data-theme="dark"] {
    --primary: #2dd4bf;
    --primary-light: #5eead4;
    --primary-dark: #14b8a6;
    --primary-bg: rgba(45, 212, 191, 0.15);
    --primary-bg-hover: rgba(45, 212, 191, 0.25);
    
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --bg-card-secondary: #334155;
    --bg-card-tertiary: #475569;
    --bg-input: #334155;
    --bg-code: #0f172a;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #64748b;
    
    --border-color: #334155;
    --border-light: #1e293b;
    
    --success-bg: rgba(16, 185, 129, 0.2);
    --warning-bg: rgba(245, 158, 11, 0.2);
    --error-bg: rgba(239, 68, 68, 0.2);
    --info-bg: rgba(14, 165, 233, 0.2);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* ============================================
   BASE STYLES
   ============================================ */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-body);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ============================================
   TOOL CONTAINER
   ============================================ */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* ============================================
   HEADER SECTION
   ============================================ */
.tool-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.tool-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
}

.tool-icon-wrapper.icns-theme {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.3);
}

.tool-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   MAIN TOOL AREA
   ============================================ */
.tool-main {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    transition: background-color var(--transition-normal);
}

/* ============================================
   UPLOAD SECTION
   ============================================ */
.upload-section {
    margin-bottom: var(--spacing-lg);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    background: var(--bg-card-secondary);
}

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

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

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

.upload-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

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

.upload-hint {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-light);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-inverse);
    box-shadow: 0 2px 8px rgba(13, 148, 136, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(13, 148, 136, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-card-tertiary);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    background: var(--bg-card-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.btn-icon:hover {
    background: var(--primary-bg);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8125rem;
}

.btn-browse {
    padding: var(--spacing-md) var(--spacing-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* ============================================
   VIEWER SECTION
   ============================================ */
.viewer-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* File Info Bar */
.file-info-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-card-secondary);
    border-radius: var(--radius-md);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.file-name-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    min-width: 0;
}

.file-name-display span:first-of-type {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    color: var(--text-muted);
    font-weight: 400;
    font-size: 0.875rem;
    white-space: nowrap;
}

.file-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Stats Bar */
.stats-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(13, 148, 136, 0.2);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.stat-item i {
    color: var(--primary);
}

.stat-label {
    color: var(--text-muted);
}

.stat-value {
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   VIEW TABS
   ============================================ */
.view-tabs {
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-card-secondary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

.tab-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.tab-btn.active {
    background: var(--bg-card);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

/* ============================================
   VIEW PANELS
   ============================================ */
.view-panels {
    background: var(--bg-card-secondary);
    border-radius: var(--radius-md);
    min-height: 400px;
    overflow: hidden;
}

.view-panel {
    display: none;
    flex-direction: column;
}

.view-panel.active {
    display: flex;
}

/* Panel Toolbar */
.panel-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.toolbar-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.toolbar-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.hex-page-info {
    font-size: 0.8125rem;
    color: var(--text-muted);
    min-width: 100px;
    text-align: center;
}

/* ============================================
   ICONS VIEW
   ============================================ */
.icons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
}

.icon-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
    position: relative;
}

.icon-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.icon-preview {
    width: 96px;
    height: 96px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: 
        linear-gradient(45deg, #e2e8f0 25%, transparent 25%),
        linear-gradient(-45deg, #e2e8f0 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #e2e8f0 75%),
        linear-gradient(-45deg, transparent 75%, #e2e8f0 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

[data-theme="dark"] .icon-preview {
    background: 
        linear-gradient(45deg, #334155 25%, transparent 25%),
        linear-gradient(-45deg, #334155 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #334155 75%),
        linear-gradient(-45deg, transparent 75%, #334155 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}

.icon-preview img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

/* Scale small icons for better visibility */
.icon-preview.small-icon img {
    transform: scale(2);
    image-rendering: pixelated;
}

.icon-details {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    text-align: center;
}

.icon-size-badge {
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-inverse);
}

.icon-size-badge.size-16 { background: var(--size-16); }
.icon-size-badge.size-32 { background: var(--size-32); }
.icon-size-badge.size-64 { background: var(--size-64); }
.icon-size-badge.size-128 { background: var(--size-128); }
.icon-size-badge.size-256 { background: var(--size-256); }
.icon-size-badge.size-512 { background: var(--size-512); }
.icon-size-badge.size-1024 { background: var(--size-1024); }
.icon-size-badge.retina { 
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

.icon-type {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: monospace;
}

.icon-meta {
    font-size: 0.6875rem;
    color: var(--text-light);
}

.icon-download-btn {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    width: 28px;
    height: 28px;
    padding: 0;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.icon-card:hover .icon-download-btn {
    opacity: 1;
}

/* Retina badge */
.retina-indicator {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    background: var(--primary);
    color: var(--text-inverse);
    font-size: 0.625rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: var(--radius-sm);
}

/* Empty state */
.icons-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--text-muted);
}

.icons-empty i {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

/* ============================================
   INFO VIEW
   ============================================ */
.info-content {
    padding: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
}

.info-section {
    margin-bottom: var(--spacing-lg);
}

.info-section:last-child {
    margin-bottom: 0;
}

.info-section-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid var(--border-color);
}

.info-grid {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
}

.info-label {
    color: var(--text-muted);
    font-weight: 500;
}

.info-value {
    color: var(--text-primary);
    word-break: break-all;
}

.info-value.mono {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.8125rem;
}

/* Icon entries list */
.icon-entries-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.icon-entry {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    display: grid;
    grid-template-columns: 80px 1fr auto;
    gap: var(--spacing-md);
    align-items: center;
    font-size: 0.8125rem;
}

.icon-entry:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.entry-type {
    font-family: monospace;
    font-weight: 600;
    color: var(--primary);
}

.entry-details {
    color: var(--text-secondary);
}

.entry-size {
    color: var(--text-muted);
    white-space: nowrap;
}

/* ============================================
   HEX VIEW
   ============================================ */
.hex-content {
    padding: var(--spacing-md);
    background: var(--bg-code);
    font-family: 'SF Mono', Monaco, 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.8125rem;
    line-height: 1.5;
    overflow-x: auto;
    min-height: 400px;
    max-height: 500px;
    overflow-y: auto;
}

.hex-row {
    display: flex;
    gap: var(--spacing-md);
    white-space: nowrap;
}

.hex-offset {
    color: #94a3b8;
    min-width: 70px;
}

.hex-bytes {
    color: #e2e8f0;
    min-width: 380px;
}

.hex-bytes .highlight {
    color: #2dd4bf;
    background: rgba(45, 212, 191, 0.2);
    padding: 0 2px;
    border-radius: 2px;
}

.hex-ascii {
    color: #64748b;
    min-width: 140px;
}

.hex-ascii .printable {
    color: #fbbf24;
}

/* Hex fullscreen mode */
.hex-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background: var(--bg-code);
    padding: var(--spacing-lg);
    overflow: auto;
}

.hex-fullscreen .hex-content {
    max-height: none;
    min-height: auto;
}

.hex-fullscreen-close {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 1001;
}

/* ============================================
   STRUCTURE VIEW
   ============================================ */
.structure-content {
    padding: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
}

.structure-tree {
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    font-size: 0.8125rem;
}

.structure-node {
    margin-bottom: var(--spacing-xs);
}

.structure-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.structure-header:hover {
    border-color: var(--primary);
    background: var(--primary-bg);
}

.structure-toggle {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.structure-node.expanded .structure-toggle {
    transform: rotate(90deg);
}

.structure-icon {
    color: var(--primary);
}

.structure-name {
    font-weight: 600;
    color: var(--text-primary);
}

.structure-info {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-left: auto;
}

.structure-children {
    display: none;
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-md);
    border-left: 1px dashed var(--border-color);
    margin-top: var(--spacing-xs);
}

.structure-node.expanded .structure-children {
    display: block;
}

.structure-field {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.field-name {
    color: var(--text-muted);
    min-width: 100px;
}

.field-value {
    color: var(--primary);
}

.field-desc {
    color: var(--text-light);
    font-style: italic;
}

/* ============================================
   ERROR MESSAGE
   ============================================ */
.error-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--error-bg);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    color: var(--error);
    margin-top: var(--spacing-md);
}

.error-message i:first-child {
    flex-shrink: 0;
}

.error-message span {
    flex: 1;
}

.error-close {
    background: transparent;
    border: none;
    color: var(--error);
    padding: var(--spacing-xs);
    cursor: pointer;
}

/* ============================================
   RELATED TOOLS
   ============================================ */
.related-tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

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

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--bg-card-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-decoration: none;
    transition: all var(--transition-fast);
    border: 1px solid var(--border-color);
}

.related-link:hover {
    background: var(--primary-bg);
    border-color: var(--primary);
    color: var(--primary);
}

/* ============================================
   INFO SECTIONS
   ============================================ */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    transition: background-color var(--transition-normal);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.info-card h2 i {
    color: var(--primary);
}

/* Steps List */
.steps-list {
    list-style: none;
    padding: 0;
    margin: 0;
    counter-reset: step;
}

.steps-list li {
    position: relative;
    padding-left: 48px;
    margin-bottom: var(--spacing-md);
    counter-increment: step;
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

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

/* Tips Grid */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.tip-item {
    display: flex;
    gap: var(--spacing-md);
}

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

.tip-content h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.tip-content p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

/* Mode Explanations */
.mode-explanations {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.mode-explain {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.mode-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
    color: var(--text-inverse);
}

.mode-tag.size-16 { background: var(--size-16); }
.mode-tag.size-32 { background: var(--size-32); }
.mode-tag.size-64 { background: var(--size-64); }
.mode-tag.size-128 { background: var(--size-128); }
.mode-tag.size-256 { background: var(--size-256); }
.mode-tag.size-512 { background: var(--size-512); }
.mode-tag.size-1024 { background: var(--size-1024); }

.mode-explain p {
    color: var(--text-secondary);
    margin: 0;
    padding-top: 2px;
}

/* ============================================
   FAQ SECTION
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card-secondary);
    border: none;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.faq-question:hover {
    background: var(--primary-bg);
}

.faq-question i {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

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

.faq-answer {
    display: none;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
}

.faq-item.open .faq-answer {
    display: block;
}

.faq-answer p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

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

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

.faq-answer code {
    background: var(--bg-card-secondary);
    padding: 2px 6px;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.875rem;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
.icons-grid::-webkit-scrollbar,
.info-content::-webkit-scrollbar,
.hex-content::-webkit-scrollbar,
.structure-content::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.icons-grid::-webkit-scrollbar-track,
.info-content::-webkit-scrollbar-track,
.hex-content::-webkit-scrollbar-track,
.structure-content::-webkit-scrollbar-track {
    background: var(--bg-card-secondary);
    border-radius: var(--radius-full);
}

.icons-grid::-webkit-scrollbar-thumb,
.info-content::-webkit-scrollbar-thumb,
.hex-content::-webkit-scrollbar-thumb,
.structure-content::-webkit-scrollbar-thumb {
    background: var(--secondary-light);
    border-radius: var(--radius-full);
}

.icons-grid::-webkit-scrollbar-thumb:hover,
.info-content::-webkit-scrollbar-thumb:hover,
.hex-content::-webkit-scrollbar-thumb:hover,
.structure-content::-webkit-scrollbar-thumb:hover {
    background: var(--secondary);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 900px) {
    .tool-container {
        padding: var(--spacing-md);
    }
    
    .tool-main {
        padding: var(--spacing-lg);
    }
    
    .icons-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .info-label {
        font-weight: 600;
        color: var(--text-secondary);
    }
    
    .icon-entry {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }
}

@media (max-width: 768px) {
    .tool-title {
        font-size: 1.75rem;
    }
    
    .tool-icon-wrapper {
        width: 48px;
        height: 48px;
    }
    
    .tool-icon-wrapper i {
        width: 24px !important;
        height: 24px !important;
    }
    
    .file-info-bar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .file-actions {
        justify-content: flex-end;
    }
    
    .view-tabs {
        flex-wrap: wrap;
    }
    
    .tab-btn {
        flex: 1;
        min-width: 80px;
        justify-content: center;
    }
    
    .hex-bytes {
        min-width: auto;
    }
    
    .hex-ascii {
        display: none;
    }
    
    .related-tools {
        flex-direction: column;
        align-items: stretch;
    }
    
    .related-links {
        justify-content: center;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
    }
    
    .mode-explain {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .tool-title {
        font-size: 1.5rem;
    }
    
    .upload-area {
        padding: var(--spacing-lg);
    }
    
    .icons-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }
    
    .icon-card {
        padding: var(--spacing-sm);
    }
    
    .icon-preview {
        width: 64px;
        height: 64px;
    }
    
    .stats-bar {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .panel-toolbar {
        flex-direction: column;
        align-items: stretch;
    }
    
    .toolbar-actions {
        justify-content: flex-start;
    }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .upload-section,
    .view-tabs,
    .panel-toolbar,
    .related-tools,
    .file-actions,
    .btn {
        display: none !important;
    }
    
    .tool-main {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    .info-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}