:root {
    --bg-dark: #0f172a;
    --bg-panel: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border: #334155;
    --success: #10b981;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

.converter-container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .converter-container {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
}

h2 {
    margin-top: 0;
    color: #fff;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

textarea {
    width: 100%;
    height: 300px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 1rem;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.9rem;
    resize: vertical;
    box-sizing: border-box;
}

textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.output-grid {
    display: grid;
    gap: 1rem;
}

.output-item {
    background: var(--bg-dark);
    border: 1px solid var(--border);
    padding: 10px;
    border-radius: 6px;
    display: flex;
    flex-direction: column;
}

.output-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 5px;
}

.output-value {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.95rem;
    color: var(--accent);
    word-break: break-all;
    cursor: pointer;
    transition: color 0.2s;
}

.output-value:active {
    color: var(--success);
}

.demo-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.demo-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.copy-hint {
    font-size: 0.7rem;
    color: var(--success);
    margin-left: auto;
    opacity: 0;
    transition: opacity 0.2s;
}

.output-item:hover .copy-hint {
    opacity: 1;
}