:root{--navy:#071b2d;--blue:#1677a8;--cyan:#57c7da;--ink:#142b3d;--muted:#6e7f8c;--line:#dce6ec;--soft:#f4f8fb;--white:#fff}*{box-sizing:border-box}html,body{min-height:100%;margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;color:var(--ink);background:#fff}button,textarea{font:inherit}.guest-topbar{height:66px;display:flex;align-items:center;justify-content:space-between;padding:0 24px;border-bottom:1px solid var(--line);background:#fff}.guest-brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none}.guest-brand span,.hero-mark{display:grid;place-items:center;color:#fff;font-weight:900;background:linear-gradient(145deg,#166b9b,var(--cyan))}.guest-brand span{width:38px;height:38px;border-radius:11px;font-size:10px}.guest-account{display:flex;gap:9px}.button{display:inline-flex;align-items:center;justify-content:center;padding:10px 15px;border-radius:11px;text-decoration:none;font-weight:700}.button.primary{color:#fff;background:var(--blue)}.button.ghost{color:var(--ink);border:1px solid var(--line);background:#fff}.button.large{padding:13px 22px}.guest-layout{min-height:calc(100vh - 66px);display:grid;grid-template-columns:250px 1fr}.guest-layout aside{padding:20px 14px;display:flex;flex-direction:column;border-right:1px solid var(--line);background:#fafcfd}.guest-layout aside>button,.guest-layout nav button{width:100%;padding:11px 12px;text-align:left;border:0;border-radius:10px;background:transparent;color:var(--ink);cursor:pointer}.guest-layout aside>button{border:1px solid var(--line);background:#fff}.guest-layout nav{display:grid;gap:4px;margin-top:12px}.guest-layout nav button:hover{background:var(--soft)}.side-login{margin-top:auto;padding:16px;border:1px solid var(--line);border-radius:15px;background:#fff}.side-login p{color:var(--muted);font-size:12px;line-height:1.5}.side-login a{display:block;padding:9px;text-align:center;color:#fff;text-decoration:none;border-radius:9px;background:var(--blue)}main{position:relative;min-width:0;min-height:calc(100vh - 66px);padding-bottom:145px;background:radial-gradient(circle at top,#fff,#f6f9fb 70%)}.guest-intro{min-height:58vh;display:grid;place-content:center;justify-items:center;text-align:center;padding:30px}.guest-intro.compact{min-height:130px}.hero-mark{width:76px;height:76px;border-radius:24px}.guest-intro h1{margin:20px 0 8px;font-size:38px}.guest-intro p{margin:0;color:var(--muted)}.guest-messages{width:min(880px,calc(100% - 38px));margin:0 auto}.guest-message{margin:0 0 18px;padding:15px 18px;line-height:1.65;border-radius:17px}.guest-message.user{width:fit-content;max-width:80%;margin-left:auto;color:#fff;background:#176993}.guest-message.assistant{border:1px solid var(--line);background:#fff;box-shadow:0 5px 20px #15364c0b}.guest-message.error{color:#8b2525;background:#fff0f0}.guest-message table{width:100%;border-collapse:collapse;display:block;overflow:auto}.guest-message th,.guest-message td{padding:8px;border:1px solid var(--line)}.guest-message mjx-container[display="true"]{overflow-x:auto;overflow-y:hidden}.loading span{display:inline-block;width:15px;height:15px;margin-right:8px;border:2px solid #bed5e1;border-top-color:var(--blue);border-radius:50%;animation:spin .8s linear infinite}.login-gate{width:min(600px,calc(100% - 38px));margin:25px auto;padding:28px;text-align:center;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 18px 50px #15364c16}.login-gate .lock{width:46px;height:46px;margin:auto;display:grid;place-items:center;color:#fff;border-radius:50%;background:var(--blue)}.login-gate h2{margin:15px 0 8px}.login-gate p{color:var(--muted);line-height:1.55}.hidden{display:none}.guest-composer-wrap{position:fixed;left:250px;right:0;bottom:0;padding:22px max(20px,calc((100vw - 950px)/2));background:linear-gradient(transparent,#fff 25%)}.guest-composer{display:flex;align-items:flex-end;gap:8px;padding:10px;border:1px solid #cbdce5;border-radius:20px;background:#fff;box-shadow:0 15px 40px #15364c1d}.guest-composer textarea{min-height:42px;max-height:150px;flex:1;padding:10px;border:0;outline:0;resize:none}.guest-composer button{width:42px;height:42px;border:0;border-radius:13px;color:#fff;background:var(--blue);cursor:pointer}.guest-composer button:disabled{opacity:.45}.guest-composer-wrap>small{display:block;margin-top:7px;text-align:center;color:#8596a1;font-size:10px}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:760px){.guest-topbar{padding:0 14px}.guest-brand b{display:none}.button.ghost{display:none}.guest-layout{grid-template-columns:1fr}.guest-layout aside{display:none}.guest-intro{min-height:55vh}.guest-intro h1{font-size:30px}.guest-composer-wrap{left:0;padding:18px 12px}.guest-message.user{max-width:92%}}