/* 
 * QR Code Generator - Main Styles
 * Modern Minimalist Design with Glassmorphism
 * Dark/Light Mode Support
 */

/* ============================================
   CSS Variables & Theme Configuration
============================================ */
:root {
    --font-primary: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    --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);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    --z-dropdown: 100;
    --z-modal: 200;
    --z-toast: 300;
}

[data-theme="light"], :root {
    --color-bg-primary: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-glass: rgba(255, 255, 255, 0.7);
    --color-bg-glass-hover: rgba(255, 255, 255, 0.85);
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-tertiary: #94a3b8;
    --color-text-inverse: #ffffff;
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-hover: rgba(0, 0, 0, 0.15);
    --color-accent: #6366f1;
    --color-accent-hover: #4f46e5;
    --color-accent-light: rgba(99, 102, 241, 0.1);
    --color-success: #10b981;
    --color-success-light: rgba(16, 185, 129, 0.1);
    --color-warning: #f59e0b;
    --color-warning-light: rgba(245, 158, 11, 0.1);
    --color-error: #ef4444;
    --color-error-light: rgba(239, 68, 68, 0.1);
    --color-info: #3b82f6;
    --color-info-light: rgba(59, 130, 246, 0.1);
    --glass-blur: 20px;
    --glass-border: rgba(255, 255, 255, 0.5);
}

[data-theme="dark"] {
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-bg-glass: rgba(30, 41, 59, 0.8);
    --color-bg-glass-hover: rgba(30, 41, 59, 0.95);
    --color-text-primary: #f8fafc;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #64748b;
    --color-text-inverse: #0f172a;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    --color-accent: #818cf8;
    --color-accent-hover: #6366f1;
    --color-accent-light: rgba(129, 140, 248, 0.15);
    --glass-border: rgba(255, 255, 255, 0.1);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(129, 140, 248, 0.2);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, var(--color-accent-light) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(20, 184, 166, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; }

h1, h2, h3, h4, h5, h6 { font-weight: 600; line-height: 1.3; color: var(--color-text-primary); }
h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p { margin-bottom: var(--space-md); color: var(--color-text-secondary); }

.text-small { font-size: 0.875rem; }
.text-tiny { font-size: 0.75rem; }
.text-muted { color: var(--color-text-tertiary); }
.text-center { text-align: center; }

.container { width: 100%; max-width: 1400px; margin: 0 auto; padding: 0 var(--space-lg); }

.app-wrapper { display: flex; min-height: 100vh; }

.main-content {
    flex: 1;
    padding: var(--space-xl);
    margin-left: 280px;
    transition: margin-left var(--transition-normal);
}

@media (max-width: 1024px) {
    .main-content { margin-left: 0; padding: var(--space-lg); }
}

/* Glass Card */
.glass-card {
    background: var(--color-bg-glass);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    background: var(--color-bg-glass-hover);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    transform: translateY(-2px);
}

.glass-card-static {
    background: var(--color-bg-glass);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.card-header { padding: var(--space-lg) var(--space-xl); border-bottom: 1px solid var(--color-border); }
.card-body { padding: var(--space-xl); }
.card-footer { padding: var(--space-lg) var(--space-xl); border-top: 1px solid var(--color-border); }

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    background: var(--color-bg-glass);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    z-index: var(--z-dropdown);
    transition: transform var(--transition-normal);
}

.sidebar-header { padding: var(--space-xl); border-bottom: 1px solid var(--color-border); }

.sidebar-logo { display: flex; align-items: center; gap: var(--space-md); }

.sidebar-logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-accent), #ec4899);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.sidebar-logo-text { font-size: 1.25rem; font-weight: 700; color: var(--color-text-primary); }
.sidebar-logo-text span { color: var(--color-accent); }

.sidebar-nav { flex: 1; padding: var(--space-lg); overflow-y: auto; }

.nav-section { margin-bottom: var(--space-xl); }

.nav-section-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-tertiary);
    padding: 0 var(--space-md);
    margin-bottom: var(--space-sm);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    margin-bottom: var(--space-xs);
}

.nav-item:hover { background: var(--color-accent-light); color: var(--color-accent); }
.nav-item.active { background: var(--color-accent); color: white; }
.nav-item-icon { width: 20px; height: 20px; flex-shrink: 0; }

.sidebar-footer { padding: var(--space-lg); border-top: 1px solid var(--color-border); }

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.user-menu:hover { background: var(--color-bg-tertiary); }

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-accent), #ec4899);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.user-info { flex: 1; min-width: 0; }
.user-name { font-weight: 600; font-size: 0.875rem; color: var(--color-text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-email { font-size: 0.75rem; color: var(--color-text-tertiary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: calc(var(--z-dropdown) - 1); }

.sidebar-toggle {
    display: none;
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--color-accent);
    color: white;
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    z-index: calc(var(--z-dropdown) - 1);
}

@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-overlay.active { display: block; }
    .sidebar-toggle { display: flex; align-items: center; justify-content: center; }
}

/* Form Elements */
.form-group { margin-bottom: var(--space-lg); }

.form-label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--color-text-primary); margin-bottom: var(--space-sm); }
.form-label-optional { color: var(--color-text-tertiary); font-weight: 400; }

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    font-family: inherit;
    font-size: 1rem;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-light);
}

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

.form-input-icon { position: relative; }
.form-input-icon .form-input { padding-left: 2.75rem; }
.form-input-icon svg { position: absolute; left: var(--space-md); top: 50%; transform: translateY(-50%); width: 20px; height: 20px; color: var(--color-text-tertiary); }

.form-textarea { resize: vertical; min-height: 120px; }

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--space-md) center;
    padding-right: 2.5rem;
}

.form-checkbox-wrapper { display: flex; align-items: center; gap: var(--space-sm); cursor: pointer; }
.form-checkbox { width: 20px; height: 20px; border: 2px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer; accent-color: var(--color-accent); }
.form-hint { font-size: 0.75rem; color: var(--color-text-tertiary); margin-top: var(--space-xs); }
.form-error { color: var(--color-error); font-size: 0.875rem; margin-top: var(--space-xs); }
.form-error-input { border-color: var(--color-error) !important; }

.color-picker-wrapper { display: flex; align-items: center; gap: var(--space-md); }
.color-picker { width: 48px; height: 48px; padding: 0; border: 2px solid var(--color-border); border-radius: var(--radius-md); cursor: pointer; overflow: hidden; }
.color-picker::-webkit-color-swatch-wrapper { padding: 0; }
.color-picker::-webkit-color-swatch { border: none; border-radius: var(--radius-sm); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-xl);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled { opacity: 0.6; cursor: not-allowed; }

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent), #4f46e5);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-accent-hover), #4338ca);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
    transform: translateY(-1px);
}

.btn-secondary { background: var(--color-bg-secondary); color: var(--color-text-primary); border: 1px solid var(--color-border); }
.btn-secondary:hover:not(:disabled) { background: var(--color-bg-tertiary); border-color: var(--color-border-hover); }

.btn-ghost { background: transparent; color: var(--color-text-secondary); }
.btn-ghost:hover:not(:disabled) { background: var(--color-bg-tertiary); color: var(--color-text-primary); }

.btn-danger { background: var(--color-error); color: white; }
.btn-danger:hover:not(:disabled) { background: #dc2626; }

.btn-success { background: var(--color-success); color: white; }
.btn-success:hover:not(:disabled) { background: #059669; }

.btn-sm { padding: var(--space-sm) var(--space-md); font-size: 0.75rem; }
.btn-lg { padding: var(--space-lg) var(--space-2xl); font-size: 1rem; }
.btn-block { width: 100%; }
.btn-icon { width: 40px; height: 40px; padding: 0; border-radius: var(--radius-md); }
.btn-icon-sm { width: 32px; height: 32px; }

/* Tabs */
.tabs {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-xs);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

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

.tab:hover { color: var(--color-text-primary); background: var(--color-bg-glass); }
.tab.active { color: var(--color-accent); background: var(--color-bg-secondary); box-shadow: var(--shadow-md); }
.tab-icon { width: 18px; height: 18px; }
.tab-content { display: none; animation: fadeIn 0.3s ease; }
.tab-content.active { display: block; }

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

/* QR Preview */
.qr-preview-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-2xl);
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-primary) 100%);
    border-radius: var(--radius-xl);
    border: 2px dashed var(--color-border);
}

.qr-preview {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 280px;
    height: 280px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.qr-preview img { max-width: 100%; max-height: 100%; }

.qr-preview-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-md);
    color: var(--color-text-tertiary);
}

.qr-preview-placeholder svg { width: 64px; height: 64px; opacity: 0.5; }
.qr-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); margin-top: var(--space-xl); }

/* Style Grid */
.style-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: var(--space-md); }

.style-option {
    position: relative;
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.style-option:hover { border-color: var(--color-accent-light); background: var(--color-bg-tertiary); }
.style-option.selected { border-color: var(--color-accent); background: var(--color-accent-light); }

.style-option.selected::after {
    content: '';
    position: absolute;
    top: var(--space-sm);
    right: var(--space-sm);
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.style-preview { width: 60px; height: 60px; margin: 0 auto var(--space-sm); border-radius: var(--radius-sm); overflow: hidden; }
.style-preview img { width: 100%; height: 100%; object-fit: cover; }
.style-name { font-size: 0.875rem; font-weight: 600; color: var(--color-text-primary); }
.style-desc { font-size: 0.75rem; color: var(--color-text-tertiary); margin-top: var(--space-xs); }

/* Size Selector */
.size-grid { display: flex; flex-wrap: wrap; gap: var(--space-sm); }

.size-option {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.size-option:hover { border-color: var(--color-accent); color: var(--color-accent); }
.size-option.selected { background: var(--color-accent); border-color: var(--color-accent); color: white; }

/* QR Cards Grid */
.qr-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-xl); }
.qr-card { position: relative; overflow: hidden; }

.qr-card-image {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, var(--color-bg-primary) 100%);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--space-lg);
}

.qr-card-image img { max-width: 160px; max-height: 160px; border-radius: var(--radius-sm); box-shadow: var(--shadow-md); }
.qr-card-body { padding: var(--space-lg); }
.qr-card-title { font-size: 1rem; font-weight: 600; color: var(--color-text-primary); margin-bottom: var(--space-xs); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.qr-card-type {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-accent-light);
    color: var(--color-accent);
    border-radius: var(--radius-full);
    text-transform: capitalize;
}

.qr-card-date { font-size: 0.75rem; color: var(--color-text-tertiary); margin-top: var(--space-sm); }
.qr-card-actions { display: flex; gap: var(--space-sm); padding: var(--space-md) var(--space-lg); border-top: 1px solid var(--color-border); }

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.modal-overlay.active { display: flex; align-items: center; justify-content: center; opacity: 1; }

.modal {
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(-20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header { display: flex; align-items: center; justify-content: space-between; padding: var(--space-lg) var(--space-xl); border-bottom: 1px solid var(--color-border); }
.modal-title { font-size: 1.25rem; font-weight: 600; }

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover { background: var(--color-bg-tertiary); color: var(--color-text-primary); }
.modal-body { padding: var(--space-xl); }
.modal-footer { display: flex; justify-content: flex-end; gap: var(--space-md); padding: var(--space-lg) var(--space-xl); border-top: 1px solid var(--color-border); }

/* Toast */
.toast-container {
    position: fixed;
    bottom: var(--space-xl);
    right: var(--space-xl);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    min-width: 300px;
    max-width: 450px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    animation: toastSlideIn 0.3s ease;
}

@keyframes toastSlideIn { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }
.toast.removing { animation: toastSlideOut 0.3s ease forwards; }
@keyframes toastSlideOut { from { opacity: 1; transform: translateX(0); } to { opacity: 0; transform: translateX(100%); } }

.toast-icon { width: 24px; height: 24px; flex-shrink: 0; }
.toast-success .toast-icon { color: var(--color-success); }
.toast-error .toast-icon { color: var(--color-error); }
.toast-warning .toast-icon { color: var(--color-warning); }
.toast-info .toast-icon { color: var(--color-info); }
.toast-content { flex: 1; }
.toast-title { font-weight: 600; font-size: 0.875rem; color: var(--color-text-primary); }
.toast-message { font-size: 0.8125rem; color: var(--color-text-secondary); }

.toast-close {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--color-text-tertiary);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.toast-close:hover { background: var(--color-bg-tertiary); }

/* Auth Page */
.auth-container { display: flex; min-height: 100vh; align-items: center; justify-content: center; padding: var(--space-xl); }
.auth-card { width: 100%; max-width: 420px; }
.auth-header { text-align: center; margin-bottom: var(--space-2xl); }

.auth-logo {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--space-lg);
    background: linear-gradient(135deg, var(--color-accent), #ec4899);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.3);
}

.auth-title { font-size: 1.75rem; font-weight: 700; margin-bottom: var(--space-sm); }
.auth-subtitle { color: var(--color-text-secondary); }

.auth-divider {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.auth-divider::before, .auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--color-border); }

.otp-input-group { display: flex; gap: var(--space-sm); justify-content: center; }

.otp-input {
    width: 48px;
    height: 56px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    font-family: var(--font-mono);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.otp-input:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-light); }
.auth-switch { text-align: center; margin-top: var(--space-lg); }
.auth-switch a { font-weight: 500; }

/* Theme Toggle */
.theme-toggle { display: flex; align-items: center; gap: var(--space-sm); padding: var(--space-sm); background: var(--color-bg-tertiary); border-radius: var(--radius-full); }

.theme-toggle-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-full);
    color: var(--color-text-tertiary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle-btn:hover { color: var(--color-text-primary); }
.theme-toggle-btn.active { background: var(--color-bg-secondary); color: var(--color-accent); box-shadow: var(--shadow-sm); }

/* Empty State */
.empty-state { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: var(--space-3xl); text-align: center; }
.empty-state-icon { width: 80px; height: 80px; margin-bottom: var(--space-xl); color: var(--color-text-tertiary); opacity: 0.5; }
.empty-state-title { font-size: 1.25rem; font-weight: 600; margin-bottom: var(--space-sm); }
.empty-state-text { color: var(--color-text-secondary); margin-bottom: var(--space-xl); max-width: 400px; }

/* Spinner */
.spinner { width: 24px; height: 24px; border: 3px solid var(--color-border); border-top-color: var(--color-accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
.spinner-lg { width: 48px; height: 48px; border-width: 4px; }
@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(255, 255, 255, 0.8); z-index: var(--z-modal); }
[data-theme="dark"] .loading-overlay { background: rgba(15, 23, 42, 0.8); }

/* Utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }
.w-full { width: 100%; }
.h-full { height: 100%; }
.hidden { display: none !important; }
.visible { visibility: visible; }
.invisible { visibility: hidden; }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    .qr-grid { grid-template-columns: 1fr; }
    .style-grid { grid-template-columns: repeat(2, 1fr); }
    .modal { width: 95%; margin: var(--space-md); }
    .toast-container { left: var(--space-md); right: var(--space-md); bottom: var(--space-md); }
    .toast { min-width: auto; width: 100%; }
}

/* Print */
@media print {
    body { background: white !important; }
    .sidebar, .sidebar-toggle, .qr-actions .btn:not(.btn-print), .toast-container, .theme-toggle { display: none !important; }
    .main-content { margin-left: 0 !important; padding: 0 !important; }
    .glass-card { box-shadow: none !important; border: 1px solid #ccc !important; background: white !important; }
    .qr-preview { box-shadow: none !important; }
}