/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Background Colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-surface: #475569;
    
    /* Text Colors */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Border Colors */
    --border-color: #334155;
    --border-hover: #475569;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Transitions */
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Styles */
body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

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

.header-content {
    max-width: 600px;
    margin: 0 auto;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title i {
    margin-right: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-color), #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Controls Section */
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    align-items: center;
    justify-content: space-between;
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    min-width: 140px;
}

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

.language-select,
.indent-select {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
    cursor: pointer;
}

.language-select:hover,
.indent-select:hover {
    border-color: var(--border-hover);
}

.language-select:focus,
.indent-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
}

/* Button Styles */
.btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

/* Loading Spinner */
.loading-spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid transparent;
    border-top: 2px solid currentColor;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.btn.loading .loading-spinner {
    display: block;
}

.btn.loading span {
    display: none;
}

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

/* Editor Section */
.editor-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

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

.panel-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.panel-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-left: auto;
}

.code-container {
    position: relative;
    height: 500px;
}

.code-input {
    width: 100%;
    height: 100%;
    padding: var(--spacing-lg);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    resize: none;
    outline: none;
    overflow-y: auto;
    white-space: pre;
}

.code-input::placeholder {
    color: var(--text-muted);
    font-style: italic;
}

.code-output {
    height: 100%;
    margin: 0;
    padding: var(--spacing-lg);
    background: transparent;
    overflow-y: auto;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
}

.code-output code {
    background: transparent !important;
    padding: 0 !important;
}

/* Line Numbers */
.line-numbers {
    position: absolute;
    left: 0;
    top: 0;
    padding: var(--spacing-lg) var(--spacing-sm);
    background: var(--bg-tertiary);
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    border-right: 1px solid var(--border-color);
    user-select: none;
    pointer-events: none;
    min-width: 3rem;
    text-align: right;
}

.input-panel .code-input {
    padding-left: 4rem;
}

/* Status Bar */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.status-info {
    display: flex;
    gap: var(--spacing-lg);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 300px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

.toast.warning {
    border-left: 4px solid var(--warning-color);
}

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

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.loading-spinner-large {
    width: 3rem;
    height: 3rem;
    border: 3px solid var(--bg-tertiary);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .editor-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .code-container {
        height: 400px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: var(--spacing-sm);
    }
    
    .title {
        font-size: 2rem;
    }
    
    .controls {
        flex-direction: column;
        align-items: stretch;
        gap: var(--spacing-md);
    }
    
    .action-buttons {
        justify-content: stretch;
    }
    
    .action-buttons .btn {
        flex: 1;
        justify-content: center;
    }
    
    .status-bar {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .toast-container {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
    }
    
    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .code-container {
        height: 300px;
    }
    
    .control-group {
        min-width: auto;
    }
    
    .panel-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
    
    .panel-actions {
        margin-left: 0;
    }
}

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

/* Focus Styles for Keyboard Navigation */
.btn:focus,
.btn-icon:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.code-input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

/* Custom Scrollbar */
.code-input::-webkit-scrollbar,
.code-output::-webkit-scrollbar {
    width: 8px;
}

.code-input::-webkit-scrollbar-track,
.code-output::-webkit-scrollbar-track {
    background: var(--bg-tertiary);
}

.code-input::-webkit-scrollbar-thumb,
.code-output::-webkit-scrollbar-thumb {
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
}

.code-input::-webkit-scrollbar-thumb:hover,
.code-output::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}