:root{color-scheme:light dark;--bg:#f5f6f8;--surface:#fcfcfd;--ink:#172435;--muted:#4e6074;--accent:#235cb7;--line:#ccd5df;--danger:#a52032;--tint:#e9eff8;font-family:"Segoe UI","Microsoft YaHei",Arial,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100dvh}a{color:var(--accent);text-underline-offset:4px}header,footer,main{width:min(1120px,100% - 48px);margin:auto}header{display:flex;align-items:center;justify-content:space-between;gap:20px;height:80px;border-bottom:1px solid var(--line)}.brand{color:var(--ink);text-decoration:none;font-size:20px;font-weight:700;white-space:nowrap}.brand span{display:block;font-size:10px;letter-spacing:.16em;color:var(--muted);margin-top:3px}header>a:last-child{font-size:14px}main{padding:56px 0 32px}.landing h1{font-size:clamp(34px,5vw,60px);line-height:1.2;letter-spacing:-.04em;margin:20px 0}.eyebrow{font-size:14px;color:var(--accent)}.intro{font-size:19px;line-height:1.8;color:var(--muted);max-width:640px}.button,button{display:inline-block;white-space:nowrap;background:var(--accent);color:#fcfcfd;padding:13px 22px;border:1px solid transparent;border-radius:7px;cursor:pointer;font:600 16px/1.4 inherit;text-decoration:none}button{font-family:inherit;font-size:16px;font-weight:600}button:disabled{opacity:.55;cursor:not-allowed}button:hover:not(:disabled),.button:hover{filter:brightness(.92)}button:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}.danger{background:var(--danger)}.flow{margin:64px 0 40px}.flow h2,aside h2{font-size:20px}.flow ol{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:0;list-style:none}.flow li{padding-top:20px;border-top:2px solid var(--line)}.flow p,aside p{color:var(--muted);line-height:1.8}aside{border-left:3px solid var(--accent);padding:1px 24px;background:var(--tint)}footer{padding:24px 0 36px;font-size:13px;color:var(--muted)}.demo{max-width:800px;padding-top:32px}.demo h1{font-size:30px;margin:10px 0}h2{font-size:21px}form{max-width:460px;margin:24px 0;background:var(--surface);padding:28px;border:1px solid var(--line);border-radius:10px}label{display:block;margin:16px 0;font-size:14px;font-weight:600}input:not([type=checkbox]){display:block;width:100%;margin-top:7px;padding:12px;font:inherit;font-size:16px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink)}input:focus{outline:2px solid var(--accent);outline-offset:2px}.account-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.consent{line-height:1.7}.consent input{margin-right:10px;width:18px;height:18px;vertical-align:middle}.call-controls{padding:24px 0}.call-controls button{margin:8px 8px 8px 0}#call-state{font-size:23px;font-weight:650}#quota,#countdown,#conversation>p{color:var(--muted);font-size:14px}#message{min-height:22px;color:var(--danger);line-height:1.6}#transcript{max-height:350px;overflow:auto;border-left:2px solid var(--line);padding-left:20px;line-height:1.7}#transcript p{margin:12px 0}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:inherit;line-height:1.9;background:var(--surface);padding:20px;border:1px solid var(--line);border-radius:7px}[hidden]{display:none!important}.invite-row{padding:16px 0;border-bottom:1px solid var(--line);overflow-wrap:anywhere}.invite-row button{margin-left:12px}#credentials{overflow-wrap:anywhere}#credentials a{word-break:break-all}@media(prefers-color-scheme:dark){:root{--bg:#131b25;--surface:#1b2735;--ink:#edf2f8;--muted:#b4c1d2;--accent:#8cb8ff;--line:#41536a;--danger:#9d293b;--tint:#1b2b43}.button,button:not(.secondary):not(.danger){color:#131b25}}@media(max-width:640px){header,footer,main{width:calc(100% - 32px)}header{height:76px;gap:12px}.brand{font-size:17px}header>a:last-child{font-size:12px}.flow ol{grid-template-columns:1fr;gap:16px}.landing{padding-top:32px}.landing h1{font-size:36px}.intro{font-size:16px}form{padding:20px}aside{padding:1px 16px}.demo h1{font-size:26px}.call-controls button{width:100%;margin-right:0}}