:root{--green:#0f766e;--green2:#14b8a6;--ink:#102a2a;--muted:#5f7473;--line:#dce8e6;--paper:#f5faf9;--white:#fff}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 15% 0,#dff5ef 0,transparent 32%),var(--paper);color:var(--ink);font-family:Inter,"Noto Sans SC","PingFang SC",system-ui,sans-serif}.topbar{height:76px;padding:0 max(24px,calc((100vw - 1180px)/2));display:flex;align-items:center;justify-content:space-between;background:rgba(255,255,255,.88);border-bottom:1px solid var(--line);backdrop-filter:blur(14px);position:sticky;top:0;z-index:20}.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}.brand-mark{width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--green),var(--green2));color:#fff;display:grid;place-items:center;font-weight:800}.brand strong,.brand small{display:block}.brand small{font-size:12px;color:var(--muted);margin-top:3px}.mode-tabs{display:flex;gap:6px;background:#edf5f3;padding:5px;border-radius:12px}.mode-tabs button,.quick-topics button{border:0;cursor:pointer}.mode-tabs button{background:transparent;color:#47615f;border-radius:9px;padding:10px 14px;font-weight:700}.mode-tabs button.active{background:#fff;color:var(--green);box-shadow:0 3px 12px #154d4420}main{max-width:1180px;margin:auto;padding:48px 24px 64px}.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:42px;align-items:end;margin-bottom:28px}.eyebrow{font-size:12px;letter-spacing:.16em;color:var(--green);font-weight:800;margin:0 0 12px}.hero h1{font-size:clamp(34px,5vw,62px);line-height:1.08;letter-spacing:-.04em;margin:0;max-width:760px}.intro{color:var(--muted);font-size:16px;line-height:1.75;max-width:730px;margin:20px 0 0}.quick-topics{display:grid;gap:9px}.quick-topics button{padding:13px 16px;text-align:left;border-radius:12px;color:#28504c;background:#fff;border:1px solid var(--line);transition:.18s}.quick-topics button:hover{transform:translateX(4px);border-color:#8bc7bd}.chat-card{height:min(720px,calc(100vh - 150px));min-height:620px;background:#fff;border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 24px 70px #1a544516}.chat-heading{height:72px;padding:0 22px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.chat-heading p{font-size:13px;color:var(--muted)}.status-dot{display:inline-block;width:9px;height:9px;background:#18ad72;border-radius:50%;margin-right:9px;box-shadow:0 0 0 5px #18ad721a}#inlineChat{display:block;width:100%;height:calc(100% - 72px);border:0;background:#fff}.floating-guide{min-height:580px;border:1px solid var(--line);border-radius:22px;background:linear-gradient(135deg,#fff,#e8f7f4);padding:64px;align-items:center}.floating-guide:not([hidden]){display:flex}.floating-guide h2{font-size:42px;margin:0 0 16px}.floating-guide p:not(.eyebrow){color:var(--muted);max-width:620px;line-height:1.8}.primary{border:0;border-radius:12px;background:var(--green);color:#fff;padding:13px 20px;font-weight:800;cursor:pointer}footer{text-align:center;padding:0 24px 28px;color:#718482;font-size:12px}@media(max-width:760px){.topbar{height:auto;padding:14px 16px;align-items:flex-start;gap:12px}.brand small{display:none}.mode-tabs button{padding:9px;font-size:12px}main{padding:28px 14px 42px}.hero{grid-template-columns:1fr;gap:24px}.hero h1{font-size:38px}.quick-topics{grid-template-columns:1fr}.chat-card{min-height:590px;height:calc(100vh - 120px);border-radius:16px}.chat-heading{height:62px}.chat-heading p{display:none}#inlineChat{height:calc(100% - 62px)}.floating-guide{padding:30px;min-height:520px}.floating-guide h2{font-size:34px}}