/* ========================================
   CSS Variables & Theme System
   ======================================== */
:root {
    /* Colors - Dark Theme */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a24;
    --color-bg-elevated: #22222e;
    
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0b0;
    --color-text-tertiary: #6b6b7b;
    
    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);
    
    --color-accent: #6366f1;
    --color-accent-hover: #818cf8;
    --color-accent-glow: rgba(99, 102, 241, 0.4);
    
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
    --gradient-glow: radial-gradient(ellipse at center, var(--color-accent-glow) 0%, transparent 70%);
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-modal: 200;
    --z-toast: 300;
    --z-loading: 400;
}

[data-theme="light"] {
    --color-bg-primary: #fafafa;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f5f5f5;
    --color-bg-elevated: #ffffff;
    
    --color-text-primary: #111111;
    --color-text-secondary: #555555;
    --color-text-tertiary: #888888;
    
    --color-border: rgba(0, 0, 0, 0.08);
    --color-border-hover: rgba(0, 0, 0, 0.15);
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* ========================================
   Reset & Base Styles
   ======================================== */
*, *::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-sans);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ========================================
   Animated Background
   ======================================== */
.bg-animation {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(139, 92, 246, 0.1), transparent),
        radial-gradient(ellipse 40% 30% at 0% 100%, rgba(217, 70, 239, 0.08), transparent);
}

.bg-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    opacity: 0.5;
}

.bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-glow);
    filter: blur(60px);
    opacity: 0.6;
    animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 0.4; transform: translateX(-50%) scale(1); }
    50% { opacity: 0.7; transform: translateX(-50%) scale(1.1); }
}

/* ========================================
   App Container
   ======================================== */
.app-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
    margin-bottom: var(--space-xl);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: inherit;
}

.logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    padding: 8px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
    stroke: white;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

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

.btn svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

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

.btn-icon:hover:not(:disabled) {
    background: var(--color-bg-elevated);
    color: var(--color-text-primary);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px var(--color-accent-glow);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), 0 0 30px var(--color-accent-glow);
}

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

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-elevated);
    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-danger);
    color: white;
}

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

.btn-save {
    width: 100%;
    padding: var(--space-lg);
    font-size: 1.125rem;
    font-weight: 600;
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    margin-top: var(--space-lg);
}

.btn-save:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl), 0 0 50px var(--color-accent-glow);
}

.btn-save:active:not(:disabled) {
    transform: translateY(-1px);
}

.btn-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.btn-shine {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transform: translateX(-100%);
}

.btn-save:hover .btn-shine {
    animation: shine 0.8s ease;
}

@keyframes shine {
    to { transform: translateX(100%); }
}

/* ========================================
   Main Content
   ======================================== */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.hero {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.title span {
    display: block;
}

.title-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ========================================
   Editor Container
   ======================================== */
.editor-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.editor-wrapper {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.editor-wrapper:focus-within {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg), 0 0 0 3px var(--color-accent-glow);
}

.editor-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-tertiary);
    border-bottom: 1px solid var(--color-border);
}

.editor-tabs {
    display: flex;
    gap: var(--space-xs);
}

.tab {
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab:hover {
    color: var(--color-text-secondary);
    background: var(--color-bg-elevated);
}

.tab.active {
    color: var(--color-accent);
    background: rgba(99, 102, 241, 0.1);
}

.editor-info {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    font-family: var(--font-mono);
}

.separator {
    margin: 0 var(--space-sm);
    opacity: 0.5;
}

.editor-body {
    position: relative;
    min-height: 300px;
}

.editor-textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--space-lg);
    padding-left: 60px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    resize: vertical;
    outline: none;
}

.editor-textarea::placeholder {
    color: var(--color-text-tertiary);
}

.editor-line-numbers {
    position: absolute;
    top: 0;
    left: 0;
    width: 45px;
    padding: var(--space-lg) var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.7;
    color: var(--color-text-tertiary);
    text-align: right;
    border-right: 1px solid var(--color-border);
    user-select: none;
    pointer-events: none;
}

.editor-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-tertiary);
    border-top: 1px solid var(--color-border);
}

.editor-actions {
    display: flex;
    gap: var(--space-sm);
}

.size-bar {
    flex: 1;
    max-width: 200px;
    height: 4px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-left: var(--space-lg);
}

.size-bar-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
    width: 0%;
}

.size-bar-fill.warning {
    background: var(--color-warning);
}

.size-bar-fill.danger {
    background: var(--color-danger);
}

/* ========================================
   Options Panel
   ======================================== */
.options-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.option-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-primary);
}

.option-label svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-tertiary);
}

.option-hint {
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.custom-code-input {
    display: flex;
    align-items: center;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color var(--transition-fast);
}

.custom-code-input:focus-within {
    border-color: var(--color-accent);
}

.code-prefix {
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
    background: var(--color-bg-elevated);
    border-right: 1px solid var(--color-border);
    white-space: nowrap;
}

.code-input {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    outline: none;
    min-width: 0;
}

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

.select-wrapper {
    position: relative;
}

.select-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    appearance: none;
    outline: none;
    transition: border-color var(--transition-fast);
}

.select-input:focus {
    border-color: var(--color-accent);
}

.select-wrapper::after {
    content: '';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--color-text-tertiary);
    pointer-events: none;
}

.toggle-label {
    justify-content: space-between;
}

.toggle-switch {
    position: relative;
    width: 44px;
    height: 24px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    inset: 0;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    left: 2px;
    bottom: 2px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.toggle-switch input:checked + .toggle-slider {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.toggle-switch input:checked + .toggle-slider::before {
    transform: translateX(20px);
    background: white;
}

/* ========================================
   Modal
   ======================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 480px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    padding: var(--space-xl);
    text-align: center;
    border-bottom: 1px solid var(--color-border);
}

.success-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border-radius: 50%;
}

.success-icon svg {
    width: 32px;
    height: 32px;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.modal-header p {
    color: var(--color-text-secondary);
}

.modal-body {
    padding: var(--space-xl);
}

.link-container {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.generated-link {
    flex: 1;
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-accent);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
}

.qr-container {
    display: flex;
    justify-content: center;
    padding: var(--space-lg);
    background: white;
    border-radius: var(--radius-lg);
}

.qr-container canvas {
    max-width: 150px;
    max-height: 150px;
}

.modal-footer {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-lg) var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.modal-footer .btn {
    flex: 1;
}

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

.modal-close:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.modal-close svg {
    width: 18px;
    height: 18px;
}

/* ========================================
   Loading Overlay
   ======================================== */
.loading-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-loading);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.loading-overlay.hidden {
    display: none;
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.loader-ring {
    position: absolute;
    width: 60px;
    height: 60px;
    border: 3px solid transparent;
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loader-ring:nth-child(2) {
    width: 48px;
    height: 48px;
    border-top-color: #8b5cf6;
    animation-delay: -0.3s;
}

.loader-ring:nth-child(3) {
    width: 36px;
    height: 36px;
    border-top-color: #d946ef;
    animation-delay: -0.6s;
}

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

.loader-text {
    margin-top: 70px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ========================================
   Viewer Styles
   ======================================== */
.viewer-state {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
}

.viewer-state.hidden {
    display: none;
}

.error-content,
.burn-content {
    text-align: center;
    max-width: 400px;
}

.error-icon,
.burn-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}

.error-icon {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
    border-radius: 50%;
}

.error-icon svg {
    width: 40px;
    height: 40px;
}

.error-title,
.burn-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.error-message,
.burn-message {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.viewer-main {
    gap: var(--space-lg);
}

.viewer-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
}

.viewer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.meta-item svg {
    width: 16px;
    height: 16px;
    color: var(--color-text-tertiary);
}

.viewer-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.viewer-content {
    flex: 1;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.content-wrapper {
    display: flex;
    min-height: 400px;
    max-height: 70vh;
    overflow: auto;
}

.line-numbers {
    flex-shrink: 0;
    width: 50px;
    padding: var(--space-lg) var(--space-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.7;
    color: var(--color-text-tertiary);
    text-align: right;
    background: var(--color-bg-tertiary);
    border-right: 1px solid var(--color-border);
    user-select: none;
}

.text-content {
    flex: 1;
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
    margin: 0;
}

.viewer-footer {
    display: flex;
    justify-content: center;
}

/* ========================================
   Dropdown
   ======================================== */
.dropdown {
    position: relative;
}

.dropdown-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.dropdown-arrow {
    width: 14px;
    height: 14px;
    transition: transform var(--transition-fast);
}

.dropdown.open .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-sm));
    right: 0;
    min-width: 200px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    width: 100%;
    padding: var(--space-md);
    font-family: inherit;
    font-size: 0.875rem;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--transition-fast);
    text-align: left;
}

.dropdown-item:hover {
    background: var(--color-bg-tertiary);
}

.dropdown-item:first-child {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.dropdown-item:last-child {
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.format-icon {
    font-size: 1.25rem;
}

/* ========================================
   Share Modal
   ======================================== */
.share-modal .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    padding: var(--space-lg) var(--space-xl);
}

.share-modal .modal-header h2 {
    margin: 0;
}

.share-link-container {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.share-link-input {
    flex: 1;
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
}

.share-qr {
    display: flex;
    justify-content: center;
    padding: var(--space-lg);
    background: white;
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
}

.share-qr canvas {
    max-width: 120px;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: var(--space-md);
}

.share-btn {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.share-btn svg {
    width: 24px;
    height: 24px;
}

.share-btn.twitter {
    background: #1da1f2;
    color: white;
}

.share-btn.linkedin {
    background: #0077b5;
    color: white;
}

.share-btn.email {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

.share-btn.whatsapp {
    background: #25d366;
    color: white;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   Toast Notifications
   ======================================== */
.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-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: toastIn 0.3s ease;
}

.toast.removing {
    animation: toastOut 0.3s ease forwards;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes toastOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.toast-icon {
    font-size: 1.25rem;
}

.toast-message {
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

.toast.success {
    border-color: var(--color-success);
}

.toast.error {
    border-color: var(--color-danger);
}

.toast.warning {
    border-color: var(--color-warning);
}

/* ========================================
   Security Overlay
   ======================================== */
.security-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(8px);
}

.security-overlay.hidden {
    display: none;
}

.security-modal {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    max-width: 400px;
}

.security-icon {
    font-size: 3rem;
    margin-bottom: var(--space-lg);
}

.security-modal h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.security-modal p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
}

.captcha-container {
    margin-bottom: var(--space-lg);
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   Theme Toggle
   ======================================== */
.icon-sun,
.icon-moon {
    width: 20px;
    height: 20px;
}

[data-theme="dark"] .icon-sun {
    display: none;
}

[data-theme="dark"] .icon-moon {
    display: block;
}

[data-theme="light"] .icon-sun {
    display: block;
}

[data-theme="light"] .icon-moon {
    display: none;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-xl) 0;
    margin-top: auto;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.footer-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-links a {
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-text-primary);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    .app-container {
        padding: var(--space-md);
    }
    
    .hero {
        margin-bottom: var(--space-xl);
    }
    
    .title {
        font-size: 1.75rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .editor-header {
        flex-direction: column;
        gap: var(--space-md);
    }
    
    .editor-info {
        order: -1;
    }
    
    .options-panel {
        grid-template-columns: 1fr;
    }
    
    .code-prefix {
        font-size: 0.65rem;
        padding: var(--space-sm);
    }
    
    .viewer-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .viewer-actions {
        justify-content: center;
    }
    
    .footer {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .toast-container {
        left: var(--space-md);
        right: var(--space-md);
        bottom: var(--space-md);
    }
}

@media (max-width: 480px) {
    .editor-tabs {
        flex-wrap: wrap;
    }
    
    .tab {
        padding: var(--space-xs) var(--space-sm);
        font-size: 0.75rem;
    }
    
    .viewer-actions .btn span:not(.btn-content) {
        display: none;
    }
}

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

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-text-tertiary);
    border-radius: var(--radius-full);
}

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

/* ========================================
   Selection
   ======================================== */
::selection {
    background: var(--color-accent);
    color: white;
}

/* ========================================
   Focus Visible
   ======================================== */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

button:focus:not(:focus-visible),
input:focus:not(:focus-visible),
textarea:focus:not(:focus-visible),
select:focus:not(:focus-visible) {
    outline: none;
}