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

:root {
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #64748b;
    --background: #f8fafc;
    --surface: #ffffff;
    --panel-header-bg: #f1f5f9;
    --output-bg: #fafafa;
    --error: #dc2626;
    --success: #16a34a;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --primary-color: #60a5fa;
        --primary-hover: #3b82f6;
        --secondary-color: #94a3b8;
        --background: #0f172a;
        --surface: #1e293b;
        --panel-header-bg: #334155;
        --output-bg: #0f172a;
        --error: #f87171;
        --success: #4ade80;
        --text: #f1f5f9;
        --text-secondary: #94a3b8;
        --border: #334155;
        --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.3), 0 1px 2px -1px rgb(0 0 0 / 0.3);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.3), 0 4px 6px -4px rgb(0 0 0 / 0.3);
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    background: var(--background);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color), #7c3aed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

.links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.editor-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    flex: 1;
}

@media (max-width: 968px) {
    .editor-container {
        grid-template-columns: 1fr;
    }
}

.editor-panel {
    display: flex;
    flex-direction: column;
    background: var(--surface);
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border);
    background: var(--panel-header-bg);
}

.panel-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text);
}

textarea {
    flex: 1;
    padding: 1.25rem;
    border: none;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9375rem;
    line-height: 1.6;
    resize: none;
    min-height: 400px;
    background: var(--surface);
    color: var(--text);
}

textarea:focus {
    outline: none;
}

textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

#output {
    background: var(--output-bg);
}

.controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    padding: 1.25rem;
    background: var(--surface);
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text);
}

.control-group input[type="number"] {
    width: 80px;
    padding: 0.5rem;
    border: 1px solid var(--border);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    transition: border-color 0.2s;
}

.control-group input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.control-group.checkbox {
    padding: 0.5rem 0.75rem;
    background: var(--background);
    border-radius: 0.375rem;
}

.control-group input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
}

.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

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

.btn-primary:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background: var(--background);
    border-color: var(--secondary-color);
}

.error {
    padding: 1rem 1.25rem;
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 0.5rem;
    color: var(--error);
    font-size: 0.875rem;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
}

.error::before {
    content: '⚠ ';
    font-weight: bold;
}

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.loading::after {
    content: '...';
    animation: ellipsis 1.5s infinite;
}

@keyframes ellipsis {
    0% { content: '.'; }
    33% { content: '..'; }
    66% { content: '...'; }
}

.hidden {
    display: none !important;
}

footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}