:root{--bg:#0a0c10;--panel:#141821;--panel-2:#1b212c;--border:#232a36;--border-soft:#1d242f;--text:#e9edf3;--muted:#8b97a6;--accent:#2dd4bf;--accent-2:#14b8a6;--accent-soft:rgba(45,212,191,0.12);--accent-ink:#042722;--bubble-user:linear-gradient(180deg,#19c4ad,#129e8c);--shadow:0 10px 34px rgba(0,0,0,0.4);--radius:16px}*{box-sizing:border-box}body,html{margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,sans-serif;color:var(--text);line-height:1.6;background:radial-gradient(900px 380px at 50% -120px,rgba(45,212,191,.1),transparent 70%),var(--bg);min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 22px;border-bottom:1px solid var(--border-soft);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.brand{font-weight:700;font-size:16px;letter-spacing:.2px}.topbar .muted{display:inline-flex;align-items:center;gap:8px}.container{max-width:720px;margin:0 auto;padding:28px 20px 72px}.tabs{display:grid;grid-template-columns:1fr 1fr;grid-gap:4px;gap:4px;padding:5px;background:var(--panel);border:1px solid var(--border);border-radius:14px;margin-bottom:20px}.tab{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;background:transparent;color:var(--muted);font:inherit;font-weight:600;font-size:14px;padding:11px 12px;border-radius:10px;cursor:pointer;transition:all .15s ease;display:inline-flex;align-items:center;justify-content:center;gap:7px}.tab:hover{color:var(--text)}.tab.active{background:var(--accent-soft);color:var(--accent);box-shadow:inset 0 0 0 1px rgba(45,212,191,.35)}.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:22px;margin-bottom:16px;box-shadow:var(--shadow)}.card h2{margin:0 0 5px;font-size:16px;font-weight:650}.sub{color:var(--muted);font-size:13.5px;margin:0 0 18px}button{font:inherit}.primary{background:linear-gradient(180deg,var(--accent),var(--accent-2));color:var(--accent-ink);border:none;border-radius:11px;padding:11px 18px;font-weight:700;cursor:pointer;transition:transform .08s ease,filter .15s ease}.primary:hover{filter:brightness(1.06)}.primary:active{transform:translateY(1px)}.primary:disabled{opacity:.45;cursor:default;filter:none}.primary.lg{padding:14px 26px;font-size:15px;border-radius:12px}.wechat-body{display:flex;flex-direction:column;align-items:center;gap:16px;padding:14px 0 6px;text-align:center}.qr-card{background:#fff;padding:14px;border-radius:16px;box-shadow:0 8px 24px rgba(0,0,0,.35);line-height:0}.qr-card img{border-radius:8px;display:block}.status{color:var(--muted);font-size:13.5px;margin:0}.badge{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:12px;font-size:14px;font-weight:600}.badge.ok{background:var(--accent-soft);color:var(--accent);box-shadow:inset 0 0 0 1px rgba(45,212,191,.3)}.chat{display:flex;flex-direction:column;gap:10px;min-height:260px;max-height:440px;overflow-y:auto;padding:4px 2px}.bubble{max-width:80%;padding:11px 14px;border-radius:16px;white-space:pre-wrap;font-size:14px}.bubble.user{align-self:flex-end;background:var(--bubble-user);color:#04201c;font-weight:500;border-bottom-right-radius:5px}.bubble.bot{align-self:flex-start;background:var(--panel-2);border:1px solid var(--border);border-bottom-left-radius:5px}.bubble.typing{color:var(--muted)}.composer{display:flex;gap:8px;margin-top:14px}.composer input{flex:1 1;background:#0d1117;border:1px solid var(--border);color:var(--text);border-radius:11px;padding:12px 14px;outline:none;transition:border-color .15s ease}.composer input:focus{border-color:var(--accent-2)}.devices{display:grid;grid-template-columns:repeat(auto-fill,minmax(108px,1fr));grid-gap:10px;gap:10px}.device{position:relative;display:flex;flex-direction:column;align-items:center;gap:7px;padding:16px 10px;background:var(--panel-2);border:1px solid var(--border);border-radius:13px;color:var(--text);cursor:pointer;transition:border-color .15s ease,transform .08s ease,background .15s ease}.device:hover{border-color:var(--accent-2);background:#1f2733}.device:active{transform:translateY(1px)}.device-icon{font-size:24px;line-height:1}.device-name{font-size:13px;font-weight:600}.device.connected{border-color:rgba(45,212,191,.5);background:var(--accent-soft)}.device-ok{font-size:11px;font-weight:700;color:var(--accent)}.hero{max-width:560px;margin:0 auto;text-align:center;padding:96px 24px}.hero h1{font-size:34px;margin:0 0 12px;letter-spacing:-.5px}.hero .muted{color:var(--muted);font-size:16px}.hero .actions{margin-top:32px;display:flex;gap:14px;justify-content:center;align-items:center}