/* Theme: Thiên nhiên xanh (nature) */
:root {
    --gb-bg: #f1f8ee;
    --gb-bg-accent: #e2f0da;
    --gb-primary: #4d8b31;
    --gb-primary-dark: #386624;
    --gb-secondary: #f6a821;
    --gb-danger: #d64545;
    --gb-warning: #e0982a;
    --gb-text: #2b3a26;
    --gb-text-muted: #6b7d63;
    --gb-card-bg: #ffffff;
    --gb-border: #cfe3c4;
    --gb-radius: 18px;
}
.gb-topbar { border-bottom-color: var(--gb-primary); background: linear-gradient(180deg, #ffffff, #f7fbf3); }
.gb-brand::before { content: "🌿 "; }
body { background-image: radial-gradient(circle at 10% 10%, #e9f5df 0%, transparent 45%); }