.header-actions{gap:15px}.icon-button{display:grid;place-items:center;width:36px;height:36px;flex-shrink:0;border-radius:50%;border:1px solid #ffffff24;background:transparent;color:#e7e5e2;padding:8px}.icon-button svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.icon-button:hover{background:#ffffff0b}.sun-icon{display:none}.language-control{position:relative}.language-menu{position:absolute;right:0;top:46px;width:180px;padding:8px;border-radius:14px;background:#191a25;color:#eeedf3;border:1px solid #ffffff25;box-shadow:0 12px 32px #0005;z-index:30}.language-menu p{margin:4px 8px 8px;color:#aaa9b9;font-size:11px}.language-menu button{width:100%;display:flex;justify-content:space-between;text-align:left;border:0;background:transparent;color:inherit;border-radius:8px;padding:9px 10px;font-size:13px}.language-menu button:hover,.language-menu button[aria-pressed=true]{background:#ffffff0c}.language-menu button span{color:var(--bright)}
html[lang=zh-CN] h1,html[lang=zh-CN] h2,html[lang=zh-CN] h3{font-family:Geist,'PingFang SC','Microsoft YaHei',sans-serif}html[lang=zh-CN] .hero h1 em{font-size:.78em;line-height:1.3}html[lang=zh-CN] .hero h1{line-height:1.2}
@media(max-width:1100px){.header-actions{gap:10px}header nav{gap:20px}}
@media(max-width:600px){.header-actions{gap:8px}.icon-button{width:32px;height:32px;padding:6px}header .brand{font-size:23px;gap:7px}header .brand-logo{width:29px;height:29px}.header-actions .button{font-size:11px;padding:7px 10px}header{column-gap:8px}.language-menu{right:-42px}}

/* Approved voice-bubble identity, 2026-10-28. */
.brand{font-family:Geist,Arial,sans-serif;font-weight:600;letter-spacing:-.035em}.brand-ai{color:#14b8a6}.brand-logo{display:block;flex-shrink:0;object-fit:contain}

/* Language selector: globe, current language, disclosure arrow. */
#language-toggle{display:inline-flex;align-items:center;justify-content:center;gap:9px;width:auto;min-height:36px;padding:7px 9px;border:0;border-radius:8px;white-space:nowrap;font:500 14px/1.3 Geist,Arial,sans-serif;color:#c5c8d6}
#language-toggle .language-chevron{width:16px;height:16px;transition:transform .15s}#language-toggle[aria-expanded=true] .language-chevron{transform:rotate(180deg)}
#language-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
@media(max-width:600px){#language-toggle{gap:5px;padding:6px 3px;font-size:12px}#language-toggle svg{width:17px;height:17px}#language-toggle .language-chevron{width:12px;height:12px}.language-menu{right:0}}