/* ========================================
   QR Code Generator - Modern Styles
   ======================================== */

/* CSS Variables */
:root {
    /* Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --success-gradient: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --warning-gradient: linear-gradient(135deg, #f7971e 0%, #ffd200 100%);

    --bg-dark: #0a0a1a;
    --bg-card: rgba(255, 255, 255, 0.05);
    --bg-card-hover: rgba(255, 255, 255, 0.08);
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    --border-color: rgba(255, 255, 255, 0.1);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Shadows */
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse at 20% 20%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(118, 75, 162, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
    animation: bgPulse 10s ease-in-out infinite;
}

@keyframes bgPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

/* App Container */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
.header {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.logo-icon {
    font-size: 3rem;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 3s ease-in-out infinite;
}

.logo-img {
    height: 48px;
    width: 48px;
    object-fit: contain;
    animation: float 3s ease-in-out infinite;
    filter: drop-shadow(0 4px 12px rgba(102, 126, 234, 0.4));
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

/* App Navigation */
.app-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    padding: 0.5rem 1.2rem;
    border-radius: 50px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateY(-2px);
}

.nav-link.active {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* Glass Card Effect */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: all var(--transition-normal);
    overflow: visible;
    position: relative;
    z-index: 1;
}

.glass-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: var(--shadow-glow);
}

/* Section Titles */
.section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.section-title .icon {
    font-size: 1.3rem;
}

/* Input Section */
.input-section {
    margin-bottom: 6rem;
}

.input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.text-input {
    flex: 1;
    min-width: 250px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-family: inherit;
    background: rgba(255, 255, 255, 0.08);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: all var(--transition-normal);
}

/* Custom Select Styling */
select.text-input {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-color: #0a0a1a;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23667eea' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.2em;
    padding: 0.8rem 2.5rem 0.8rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid rgba(102, 126, 234, 0.4);
    border-radius: 12px;
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

select.text-input:hover {
    border-color: #667eea;
    background-color: rgba(102, 126, 234, 0.15);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

select.text-input:focus {
    border-color: #667eea;
    background-color: rgba(102, 126, 234, 0.2);
    box-shadow: 0 0 25px rgba(102, 126, 234, 0.5);
    outline: none;
}

select.text-input option {
    background-color: #0a0a1a;
    color: #e0e0e0;
    padding: 14px 16px;
    font-size: 0.95rem;
}

select.text-input option:checked {
    background-color: #667eea;
    color: white;
    font-weight: 600;
}

.text-input:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

.text-input::placeholder {
    color: var(--text-muted);
}

/* Custom Select Dropdown */
.custom-select-wrapper {
    position: relative;
    user-select: none;
    width: 100%;
    z-index: 10000;
}

.custom-select {
    position: relative;
    display: flex;
    flex-direction: column;
}

.custom-select-trigger {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.08);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.custom-select-trigger:hover {
    border-color: rgba(255, 255, 255, 0.3);
    background: rgba(255, 255, 255, 0.12);
}

.custom-select.open .custom-select-trigger {
    border-color: #667eea;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}

.custom-select-trigger::after {
    content: '';
    width: 0.8em;
    height: 0.8em;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    transition: transform 0.3s;
}

.custom-select.open .custom-select-trigger::after {
    transform: rotate(180deg);
}

.custom-options {
    position: absolute;
    display: block;
    top: 100%;
    left: 0;
    min-width: 200px;
    width: 100%;
    border: 2px solid #667eea;
    border-top: 0;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    background: #0a0a1a;
    transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 99999;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
    margin-top: -2px;
}

.custom-select.open .custom-options {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
}

.custom-option {
    position: relative;
    display: block;
    padding: 0.8rem var(--spacing-md);
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.custom-option:last-child {
    border-bottom: none;
}

.custom-option:hover {
    color: white;
    background: rgba(102, 126, 234, 0.2);
    padding-left: 2rem;
}

.custom-option.selected {
    color: white;
    background: rgba(102, 126, 234, 0.4);
}

/* QR Type Tabs */
.qr-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-xs);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
}

.qr-tab {
    flex: 1;
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.qr-tab:hover {
    color: white;
    background: rgba(255, 255, 255, 0.05);
}

.qr-tab.active {
    background: var(--bg-card);
    color: #667eea;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* QR Forms */
.qr-forms {
    margin-bottom: var(--spacing-md);
}

.qr-form {
    display: none;
    flex-direction: column;
    gap: var(--spacing-md);
}

.qr-form.active {
    display: flex;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.btn-icon {
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-generate {
    white-space: nowrap;
    padding: var(--spacing-sm) var(--spacing-lg);
}

/* Download Buttons */
.btn-download {
    flex: 1;
    min-width: 80px;
    padding: var(--spacing-sm);
    font-size: 0.85rem;
}

.btn-png {
    background: var(--success-gradient);
    color: white;
}

.btn-jpg {
    background: var(--warning-gradient);
    color: #333;
}

.btn-svg {
    background: var(--accent-gradient);
    color: white;
}

.btn-stl {
    background: var(--secondary-gradient);
    color: white;
}

.btn-obj {
    background: linear-gradient(135deg, #fc4a1a 0%, #f7b733 100%);
    color: white;
}

.btn-download:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* Customization Section */
.customization-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

/* Color Controls */
.color-controls {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.color-group {
    flex: 1;
    min-width: 120px;
}

.color-group label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.color-input-wrapper {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

input[type="color"] {
    width: 50px;
    height: 50px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    overflow: hidden;
    padding: 0;
    background: transparent;
}

input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

input[type="color"]::-webkit-color-swatch {
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

input[type="color"]:hover::-webkit-color-swatch {
    border-color: rgba(255, 255, 255, 0.4);
}

.color-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Style Options */
.style-options {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.style-option {
    flex: 1;
    min-width: 90px;
    cursor: pointer;
}

.style-option input {
    display: none;
}

.style-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.style-option input:checked+.style-preview {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.2);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

.style-option:hover .style-preview {
    background: rgba(255, 255, 255, 0.1);
}

.preview-icon {
    font-size: 1.2rem;
    line-height: 1.2;
    text-align: center;
    margin-bottom: var(--spacing-xs);
}

.style-label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-align: center;
    margin-top: var(--spacing-xs);
}

/* Toggle Switch */
.toggle-group {
    margin-bottom: var(--spacing-md);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.toggle-label input {
    display: none;
}

.toggle-switch {
    position: relative;
    width: 50px;
    height: 26px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 13px;
    transition: all var(--transition-normal);
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: all var(--transition-normal);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.toggle-label input:checked+.toggle-switch {
    background: var(--primary-gradient);
}

.toggle-label input:checked+.toggle-switch::after {
    transform: translateX(24px);
}

.toggle-text {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Border Settings */
.border-settings {
    display: none;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    margin-top: var(--spacing-sm);
    gap: var(--spacing-md);
    flex-direction: column;
}

.border-settings.active {
    display: flex;
}

.slider-group.compact {
    margin-top: var(--spacing-sm);
}

.slider-group.compact .slider-header {
    margin-bottom: var(--spacing-xs);
}

/* Logo Upload */
.logo-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.logo-upload-area {
    cursor: pointer;
}

.logo-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    padding: var(--spacing-md);
}

.logo-preview:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
}

.logo-preview.has-logo {
    border-style: solid;
    border-color: #667eea;
}

.logo-preview img {
    max-width: 80px;
    max-height: 80px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.upload-icon {
    font-size: 2rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
    transition: all var(--transition-normal);
}

.logo-preview:hover .upload-icon {
    color: #667eea;
    transform: scale(1.1);
}

.logo-preview p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.logo-settings {
    display: none;
}

.logo-settings.active {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* Small Button */
.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
}

.btn-remove {
    background: rgba(235, 51, 73, 0.2);
    color: #f45c43;
    border: 1px solid rgba(235, 51, 73, 0.3);
}

.btn-remove:hover {
    background: rgba(235, 51, 73, 0.3);
    border-color: #f45c43;
}

/* Logo Tabs */
.logo-tabs {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.tab-btn.active {
    background: rgba(102, 126, 234, 0.2);
    border-color: #667eea;
    color: white;
}

.tab-content {
    display: none;
}

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

/* Icon Search */
.icon-search-wrapper {
    margin-bottom: var(--spacing-md);
}

.icon-search {
    width: 100%;
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    transition: all var(--transition-normal);
}

.icon-search:focus {
    outline: none;
    border-color: #667eea;
    background: rgba(255, 255, 255, 0.12);
}

.icon-search::placeholder {
    color: var(--text-muted);
}

/* Icon Collections */
.icon-collections {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
}

.collection-btn {
    padding: 0.4rem 0.8rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.collection-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.collection-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}

/* Icon Grid */
.icon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: var(--spacing-xs);
    max-height: 200px;
    overflow-y: auto;
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
}

.icon-grid::-webkit-scrollbar {
    width: 6px;
}

.icon-grid::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 3px;
}

.icon-grid::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.icon-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 45px;
    height: 45px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1.4rem;
}

.icon-item:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--border-color);
    transform: scale(1.1);
}

.icon-item.selected {
    background: rgba(102, 126, 234, 0.3);
    border-color: #667eea;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.icon-item svg {
    width: 24px;
    height: 24px;
}

.icon-loading {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--spacing-md);
    color: var(--text-muted);
}

/* Icon Color Picker */
.icon-color-picker {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.icon-color-picker label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 3D Settings */
.settings-3d {
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 100;
}

.slider-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.slider-group {
    display: flex;
    flex-direction: column;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.slider-header label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.slider-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: #667eea;
    background: rgba(102, 126, 234, 0.2);
    padding: 0.3rem 0.8rem;
    border-radius: var(--radius-sm);
}

/* Custom Slider */
.slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    outline: none;
    cursor: pointer;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.5);
    transition: all var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.7);
}

.slider::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 10px rgba(102, 126, 234, 0.5);
}

/* Preview Section */
.preview-section {
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.preview-card {
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

.preview-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.preview-area {
    flex: 1;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    position: relative;
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-sm);
    opacity: 0.3;
}

.placeholder p {
    font-size: 0.9rem;
}

#qr-canvas {
    max-width: 100%;
    max-height: 280px;
    border-radius: var(--radius-sm);
}

#three-canvas {
    width: 100% !important;
    height: 300px !important;
    border-radius: var(--radius-md);
}

.download-buttons {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Animations */
@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.generating {
    animation: pulse 0.5s ease-in-out infinite;
}

/* Responsive */
@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-sm);
    }

    .logo h1 {
        font-size: 1.8rem;
    }

    .logo-icon {
        font-size: 2rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .btn-generate {
        width: 100%;
    }

    .preview-container {
        grid-template-columns: 1fr;
    }

    .color-controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }

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

/* Loading State */
.loading {
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}