:root{--eh-bg:#eef2f7;--eh-surface:#fff;--eh-card-bg:#fff;--eh-border:#e2e8f0;--eh-text:#1f2937;--eh-muted:#94a3b8;--eh-primary:#2563eb;--eh-link:#2563eb;--eh-primary-contrast:#fff;--eh-header-bg:#0f2c4d;--eh-bot-bubble:#eef2f7;--eh-user-bubble:#2563eb;--eh-radius:11px;--eh-shadow:0 10px 30px rgba(15,44,77,.12)}@media (prefers-color-scheme:dark){:root{--eh-bg:#000;--eh-surface:#000;--eh-card-bg:#1c1c1e;--eh-border:#1f1f22;--eh-text:#fff;--eh-muted:#8e8e93;--eh-primary:#2563eb;--eh-link:#498af0;--eh-primary-contrast:#fff;--eh-header-bg:#0f2c4d;--eh-bot-bubble:#26262b;--eh-user-bubble:#2563eb;--eh-radius:18px;--eh-shadow:0 12px 34px rgba(0,0,0,.55)}}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--eh-bg);color:var(--eh-text);font-family:Segoe UI,system-ui,-apple-system,Helvetica Neue,Arial,Noto Sans Arabic,Cairo,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit}