.language-switcher { display: inline-flex; flex: 0 0 auto; align-items: center; gap: 2px; padding: 3px; border: 1px solid var(--line, #34383f); border-radius: 7px; background: var(--panel, #101216); }
.language-switcher button { min-width: 28px; min-height: 28px; padding: 3px 5px; border: 0; border-radius: 4px; background: transparent; color: var(--muted, #aaa); font: 600 11px/1.3 var(--mono, monospace); cursor: pointer; }
.language-switcher button[aria-pressed="true"] { background: var(--text, #f4f4f1); color: var(--bg, #08090a); }
.language-switcher button:focus-visible { outline: 2px solid var(--text, #f4f4f1); outline-offset: 3px; }
html:lang(zh-CN) { --sans: Arial, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif; }
html:lang(zh-CN) :is(.section-head h2,.readout-head h2,.dq-card h3,.observations-copy h3,.setup-copy h3,.rail-heading h2,.rollout-outline h2,.trajectory-policy-replay > header strong,.display-title) { font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans CJK SC', sans-serif; font-style: normal; letter-spacing: 0; line-height: 1.3; }