/* ============================================
   Gradient Generator - Stylesheet
   Dark Mode Support with Light Mode Default
   ============================================ */

/* CSS Variables - Light Mode (Default) */
:root {
    --transition-speed: 0.25s;
    
    /* Primary Colors - Using site's color palette */
    --primary: #3399cc;
    --primary-light: #E0F2FE;
    --primary-dark: #2980b9;
    --accent: #339966;
    --accent-light: #E8F5E9;
    
    /* Status Colors */
    --success: #339966;
    --success-light: #E8F5E9;
    --warning: #f59e0b;
    --warning-light: #FEF3C7;
    --danger: #e64e4e;
    --danger-light: #FEE2E2;
    
    /* Background Colors */
    --bg: #F0F9FF;
    --bg-elevated: #ffffff;
    --bg-secondary: #F1F5F9;
    --bg-tertiary: #E2E8F0;
    
    /* Text Colors */
    --text: #1E293B;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    /* Border Colors */
    --border: #CBD5E1;
    --border-light: #E2E8F0;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1);
    --shadow-primary: 0 4px 14px rgba(51, 153, 204, 0.25);
    --shadow-primary-hover: 0 6px 20px rgba(51, 153, 204, 0.35);
    
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Checkerboard for transparency preview */
    --checker-light: #f0f0f0;
    --checker-dark: #e0e0e0;
    
    /* Input */
    --input-bg: #ffffff;
    --input-border: #CBD5E1;
    
    /* Scrollbar */
    --scrollbar-track: var(--bg);
    --scrollbar-thumb: var(--text-muted);
    --scrollbar-thumb-hover: var(--text-secondary);
}

/* Dark Mode Colors */
[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-light: rgba(96, 165, 250, 0.15);
    --primary-dark: #3b82f6;
    --accent: #4ade80;
    --accent-light: rgba(74, 222, 128, 0.15);
    
    /* Status Colors */
    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.15);
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    
    /* Background Colors */
    --bg: #0F172A;
    --bg-elevated: #1E293B;
    --bg-secondary: #334155;
    --bg-tertiary: #475569;
    
    /* Text Colors */
    --text: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    
    /* Border Colors */
    --border: #475569;
    --border-light: #334155;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px 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);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.5);
    --shadow-primary: 0 4px 14px rgba(96, 165, 250, 0.2);
    --shadow-primary-hover: 0 6px 20px rgba(96, 165, 250, 0.3);
    
    /* Checkerboard */
    --checker-light: #334155;
    --checker-dark: #475569;
    
    /* Input */
    --input-bg: #334155;
    --input-border: #475569;
}

/* Base Styles */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Container */
.tool-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.tool-header {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.tool-icon-wrapper {
    width: 64px;
    height: 64px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-primary);
    flex-shrink: 0;
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.tool-icon-wrapper svg,
.tool-icon-wrapper i {
    width: 28px;
    height: 28px;
}

.tool-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin: 0;
    color: var(--primary);
    letter-spacing: -0.02em;
}

.tool-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.7;
}

.tool-description a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.tool-description a:hover {
    text-decoration: underline;
}

/* Main Tool Area */
.tool-main {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
    position: relative;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* ============================================
   PREVIEW SECTION
   ============================================ */
.preview-section {
    padding: 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.preview-container {
    max-width: 100%;
    margin: 0 auto;
}

.preview-canvas-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-image: 
        linear-gradient(45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-light) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-light) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-light) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

#gradientCanvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
}

.preview-overlay {
    position: absolute;
    bottom: 1rem;
    right: 1rem;
    pointer-events: none;
}

.preview-dimensions {
    padding: 0.35rem 0.75rem;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    font-family: monospace;
}

/* ============================================
   CONTROLS SECTION
   ============================================ */
.controls-section {
    padding: 2rem;
}

/* Section Label */
.section-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.75rem;
}

.section-label svg,
.section-label i {
    color: var(--primary);
    width: 16px;
    height: 16px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.section-header .section-label {
    margin-bottom: 0;
}

/* ============================================
   GRADIENT TYPE TABS
   ============================================ */
.type-selector {
    margin-bottom: 2rem;
}

.type-tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-secondary);
    padding: 0.35rem;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-speed);
}

.type-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.type-tab:hover {
    color: var(--text);
    background: var(--bg-tertiary);
}

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

.type-tab svg,
.type-tab i {
    width: 18px;
    height: 18px;
}

/* ============================================
   SETTINGS GRID
   ============================================ */
.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.settings-column {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ============================================
   COLOR STOPS
   ============================================ */
.color-stops-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: background-color var(--transition-speed);
}

.btn-icon {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

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

.color-stops-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1rem;
    max-height: 240px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.color-stop-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
    cursor: grab;
}

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

.color-stop-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.color-stop-drag {
    color: var(--text-muted);
    cursor: grab;
}

.color-stop-drag:active {
    cursor: grabbing;
}

.color-stop-picker {
    width: 40px;
    height: 32px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0;
    cursor: pointer;
    overflow: hidden;
    background: transparent;
}

.color-stop-picker::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-stop-picker::-webkit-color-swatch {
    border: none;
    border-radius: 3px;
}

.color-stop-hex {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text);
    font-family: monospace;
    font-size: 0.85rem;
    text-transform: uppercase;
    transition: border-color 0.2s ease;
}

.color-stop-hex:focus {
    outline: none;
    border-color: var(--primary);
}

.color-stop-position {
    width: 60px;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.85rem;
    text-align: center;
    transition: border-color 0.2s ease;
}

.color-stop-position:focus {
    outline: none;
    border-color: var(--primary);
}

.color-stop-unit {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.color-stop-remove {
    width: 28px;
    height: 28px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--danger-light);
    color: var(--danger);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    opacity: 0.7;
}

.color-stop-remove:hover {
    opacity: 1;
    background: var(--danger);
    color: white;
}

.color-stop-remove:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.color-stops-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.color-stops-hint svg,
.color-stops-hint i {
    flex-shrink: 0;
}

/* Quick Actions */
.quick-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}

.action-btn svg,
.action-btn i {
    width: 16px;
    height: 16px;
}

/* ============================================
   ANGLE CONTROL
   ============================================ */
.angle-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: background-color var(--transition-speed);
}

.angle-control {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.angle-wheel-container {
    flex-shrink: 0;
}

.angle-wheel {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--bg-elevated);
    border: 3px solid var(--border);
    position: relative;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.angle-wheel:hover {
    border-color: var(--primary);
}

.angle-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 50%;
    height: 3px;
    background: var(--primary);
    transform-origin: left center;
    transform: translateY(-50%) rotate(0deg);
    border-radius: 2px;
    pointer-events: none;
}

.angle-indicator::after {
    content: '';
    position: absolute;
    right: -4px;
    top: 50%;
    transform: translateY(-50%);
    width: 10px;
    height: 10px;
    background: var(--primary);
    border-radius: 50%;
}

.angle-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: 50%;
}

.angle-input-group {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.angle-input {
    width: 70px;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--input-bg);
    color: var(--text);
    font-size: 1.25rem;
    font-weight: 700;
    text-align: center;
    transition: border-color 0.2s ease;
}

.angle-input:focus {
    outline: none;
    border-color: var(--primary);
}

.angle-unit {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 600;
}

.angle-presets {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0.35rem;
}

.angle-preset {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.angle-preset:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.angle-preset.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* ============================================
   POSITION CONTROL (Radial/Conic)
   ============================================ */
.position-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: background-color var(--transition-speed);
}

.position-control {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.position-grid {
    width: 100px;
    height: 100px;
    background: var(--bg-elevated);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    position: relative;
    cursor: crosshair;
    transition: border-color 0.2s ease;
}

.position-grid:hover {
    border-color: var(--primary);
}

.position-marker {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--primary);
    border: 2px solid white;
    border-radius: 50%;
    transform: translate(-50%, -50%);
    top: 50%;
    left: 50%;
    box-shadow: var(--shadow-md);
    pointer-events: none;
}

.position-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.position-input-group {
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.position-input-group label {
    width: 20px;
    font-weight: 600;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.position-input-group input {
    width: 60px;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.9rem;
    text-align: center;
    transition: border-color 0.2s ease;
}

.position-input-group input:focus {
    outline: none;
    border-color: var(--primary);
}

.position-input-group span {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.position-presets {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.35rem;
}

.position-preset {
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.position-preset:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.position-preset.active {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

/* ============================================
   SHAPE OPTIONS (Radial)
   ============================================ */
.shape-section {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    transition: background-color var(--transition-speed);
}

.shape-options {
    display: flex;
    gap: 0.5rem;
}

.shape-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg-elevated);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.shape-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.shape-btn svg,
.shape-btn i {
    width: 16px;
    height: 16px;
}

/* ============================================
   PRESETS SECTION
   ============================================ */
.presets-section {
    margin-bottom: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    transition: border-color var(--transition-speed);
}

.preset-nav {
    display: flex;
    gap: 0.35rem;
}

.preset-nav-btn {
    width: 32px;
    height: 32px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.preset-nav-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.presets-carousel {
    overflow: hidden;
    margin: 0 -0.5rem;
    padding: 0 0.5rem;
}

.presets-track {
    display: flex;
    gap: 0.75rem;
    transition: transform 0.3s ease;
}

.preset-item {
    flex-shrink: 0;
    width: 80px;
    height: 50px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.preset-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.preset-item.active {
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
}

/* ============================================
   OUTPUT SECTION
   ============================================ */
.output-section {
    padding: 2rem;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    display: grid;
    gap: 1.5rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

/* CSS Output */
.css-output {
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.btn-copy {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--primary);
    border-radius: var(--radius-full);
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-copy:hover {
    background: var(--primary);
    color: white;
}

.code-block {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: 1rem;
    overflow-x: auto;
    transition: background-color var(--transition-speed);
}

.code-block code {
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.875rem;
    color: var(--text);
    word-break: break-all;
}

/* Export Section */
.export-section {
    background: var(--bg-elevated);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.export-options {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.export-size {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.export-size > label {
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
}

.size-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.size-inputs input {
    width: 80px;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text);
    font-size: 0.9rem;
    text-align: center;
    transition: border-color 0.2s ease;
}

.size-inputs input:focus {
    outline: none;
    border-color: var(--primary);
}

.size-separator {
    color: var(--text-muted);
    font-weight: 600;
}

.size-presets {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.size-preset {
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    background: var(--bg-secondary);
    color: var(--text-muted);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.size-preset:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.export-buttons {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    border: none;
}

.btn-export {
    background: var(--accent);
    color: white;
    box-shadow: 0 2px 8px rgba(51, 153, 102, 0.25);
}

.btn-export:hover {
    background: #2d8659;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(51, 153, 102, 0.35);
}

.btn-export-svg {
    background: var(--primary);
    box-shadow: 0 2px 8px rgba(51, 153, 204, 0.25);
}

.btn-export-svg:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(51, 153, 204, 0.35);
}

/* ============================================
   TOAST NOTIFICATION
   ============================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 1.5rem;
    background: var(--accent);
    color: white;
    border-radius: var(--radius-full);
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

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

/* ============================================
   RELATED TOOLS
   ============================================ */
.related-tools {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.related-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--text);
    font-size: 0.9rem;
}

.related-label svg,
.related-label i {
    color: var(--primary);
    width: 16px;
    height: 16px;
}

.related-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.related-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border);
}

.related-link:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.related-link svg,
.related-link i {
    width: 16px;
    height: 16px;
}

/* ============================================
   INFO SECTIONS
   ============================================ */
.info-sections {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.info-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-xl);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.info-card h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    color: var(--text);
    margin: 0 0 1.5rem 0;
}

.info-card h2 svg,
.info-card h2 i {
    color: var(--primary);
    width: 24px;
    height: 24px;
}

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

.steps-list li {
    position: relative;
    padding-left: 3.25rem;
    margin-bottom: 1rem;
    counter-increment: step;
    color: var(--text-secondary);
    line-height: 1.6;
}

.steps-list li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: calc(1rem - 1px);
    top: 2rem;
    bottom: 0;
    width: 2px;
    background: var(--primary-light);
}

.steps-list li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    z-index: 1;
}

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

.steps-list li a {
    color: var(--primary);
    text-decoration: none;
}

.steps-list li a:hover {
    text-decoration: underline;
}

/* Steps Tip */
.steps-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background: var(--warning-light);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.steps-tip i,
.steps-tip svg {
    color: var(--warning);
    flex-shrink: 0;
    margin-top: 2px;
}

.steps-tip a {
    color: var(--warning);
    font-weight: 600;
    text-decoration: none;
}

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

/* Type Explanations */
.type-explanations {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.type-explain {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.type-tag {
    flex-shrink: 0;
    padding: 0.35rem 0.85rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    color: white;
}

.type-tag.linear {
    background: var(--primary);
}

.type-tag.radial {
    background: var(--accent);
}

.type-tag.conic {
    background: #9b59b6;
}

.type-explain p {
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.6;
}

.type-explain p a {
    color: var(--primary);
    text-decoration: none;
}

.type-explain p a:hover {
    text-decoration: underline;
}

/* Use Cases Grid */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.use-case-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

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

.use-case-content h4 {
    margin: 0 0 0.35rem;
    font-size: 1rem;
    color: var(--text);
}

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

.use-case-content p a {
    color: var(--primary);
    text-decoration: none;
}

.use-case-content p a:hover {
    text-decoration: underline;
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

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

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text);
    text-align: left;
    transition: all 0.2s ease;
}

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

.faq-question svg,
.faq-question i {
    flex-shrink: 0;
    color: var(--primary);
    width: 20px;
    height: 20px;
    transition: transform 0.3s ease;
}

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

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

.faq-item.open .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding: 1rem 1.25rem;
    margin: 0;
    color: var(--text-secondary);
    line-height: 1.7;
    border-top: 1px solid var(--border);
    background: var(--bg-elevated);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

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

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

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 900px) {
    .settings-grid {
        grid-template-columns: 1fr;
    }
    
    .use-cases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .tool-container {
        padding: 1rem;
    }
    
    .tool-title-row {
        gap: 0.75rem;
    }
    
    .tool-icon-wrapper {
        width: 50px;
        height: 50px;
    }
    
    .tool-icon-wrapper svg,
    .tool-icon-wrapper i {
        width: 24px;
        height: 24px;
    }
    
    .preview-section,
    .controls-section,
    .output-section {
        padding: 1.5rem;
    }
    
    .type-tabs {
        flex-direction: column;
    }
    
    .angle-control,
    .position-control {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .angle-presets {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .export-size {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .export-buttons {
        width: 100%;
    }
    
    .btn-export {
        flex: 1;
        min-width: calc(50% - 0.375rem);
    }
    
    .related-tools {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .type-explain {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .info-card {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .tool-title-row {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .color-stop-item {
        flex-wrap: wrap;
    }
    
    .color-stop-hex {
        order: 5;
        flex: 1 1 100%;
        margin-top: 0.5rem;
    }
    
    .quick-actions {
        flex-direction: column;
    }
    
    .action-btn {
        justify-content: center;
    }
    
    .export-buttons {
        flex-direction: column;
    }
    
    .btn-export {
        width: 100%;
    }
}

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--scrollbar-thumb-hover);
}

/* Selection */
::selection {
    background: rgba(51, 153, 204, 0.2);
    color: var(--text);
}

[data-theme="dark"] ::selection {
    background: rgba(96, 165, 250, 0.3);
}

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

.controls-section,
.output-section {
    animation: fadeIn 0.4s ease;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}