: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;
}

.optimizer-container {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 0 1rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

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

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

.panel.full-width {
    grid-column: 1 / -1;
}

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%;
    min-height: 350px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 12px;
    border-radius: 6px;
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 0.85rem;
    resize: vertical;
    box-sizing: border-box;
}

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

.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 1rem;
}

.btn {
    background: var(--accent);
    border: none;
    color: #fff;
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: background 0.2s;
}

.btn:hover {
    background: var(--accent-hover);
}

.btn-secondary {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-muted);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: none;
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
    margin-top: 1rem;
}

.stat-item {
    background: var(--bg-dark);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--border);
    text-align: center;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: 1.3rem;
    color: var(--accent);
    font-weight: 700;
    margin-top: 4px;
}

.savings {
    color: var(--success) !important;
}