:root{--navy:#07152f;--blue:#165dff;--cyan:#3bd6ff;--surface:#f6f8fc;--line:#dfe5ef;--text:#14213d;--muted:#68758a;--white:#fff}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{color:var(--text);background:var(--surface);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea{font:inherit}button{cursor:pointer}.lock-page{background:radial-gradient(circle at 15% 10%, #3bd6ff33, transparent 28%), radial-gradient(circle at 85% 90%, #165dff40, transparent 35%), var(--navy);place-items:center;min-height:100vh;padding:24px;display:grid}.lock-card{color:#fff;text-align:center;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#0c1f42db;border:1px solid #ffffff26;border-radius:28px;width:min(440px,100%);padding:44px;box-shadow:0 28px 80px #00000059}.brand-mark{color:#fff;background:linear-gradient(135deg, var(--blue), var(--cyan));border-radius:18px;place-items:center;width:58px;height:58px;font-size:28px;font-weight:900;display:inline-grid;box-shadow:0 10px 28px #165dff59}.brand-mark.small{border-radius:13px;width:42px;height:42px;font-size:20px}.eyebrow{color:var(--cyan);letter-spacing:.15em;margin:24px 0 8px;font-size:12px;font-weight:800}.lock-card h1{letter-spacing:-.05em;margin:0;font-size:clamp(38px,10vw,60px)}.muted{color:#b8c5d9;line-height:1.55}.lock-form{gap:12px;margin:28px 0 18px;display:grid}.lock-form input,.lock-form button{border-radius:14px;min-height:50px}.lock-form input{color:#fff;background:#ffffff14;border:1px solid #fff3;outline:none;padding:0 16px}.lock-form input:focus{border-color:var(--cyan)}.lock-form button,.composer button{color:#fff;background:linear-gradient(135deg, var(--blue), #2f89ff);border:0;font-weight:800}.lock-card small{color:#8fa0ba}.app-shell{grid-template-columns:270px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{color:#fff;background:var(--navy);flex-direction:column;justify-content:space-between;min-height:100vh;padding:24px 18px;display:flex}.brand{align-items:center;gap:12px;padding:0 8px 22px;display:flex}.brand strong,.brand span{display:block}.brand span{color:#94a7c5;margin-top:3px;font-size:12px}.new-chat{color:#fff;text-align:left;background:#ffffff0f;border:1px solid #ffffff2e;border-radius:13px;width:100%;padding:13px}.new-chat:hover{background:#ffffff1c}.status{color:#aebbd0;background:#ffffff0d;border-radius:12px;padding:12px;font-size:12px}.status-dot{background:#3ee6a8;border-radius:50%;width:8px;height:8px;margin-right:8px;display:inline-block;box-shadow:0 0 12px #3ee6a8}.chat{background:var(--white);grid-template-rows:auto minmax(0,1fr) auto;height:100vh;display:grid}.chat header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:16px 28px;display:flex}.chat header h2,.chat header p{margin:0}.chat header h2{font-size:17px}.chat header p{color:var(--muted);margin-top:3px;font-size:12px}.logout{border:1px solid var(--line);color:var(--muted);background:#fff;border-radius:10px;padding:9px 13px}.messages{padding:30px max(24px,50% - 420px);overflow-y:auto}.hero{text-align:center;padding:36px 0 30px}.hero h1{letter-spacing:-.04em;margin:18px 0 8px;font-size:clamp(28px,4vw,44px)}.hero p{color:var(--muted);margin:0}.message{border-radius:18px;grid-template-columns:42px minmax(0,1fr);gap:14px;margin:18px 0;padding:18px;display:grid}.message.assistant{background:#f8faff;border:1px solid #e5eaf3}.message.user{background:#edf4ff}.avatar{color:#fff;background:var(--navy);border-radius:11px;place-items:center;width:38px;height:38px;font-size:11px;font-weight:900;display:grid}.message p{white-space:pre-wrap;margin:7px 0 0;line-height:1.65}.typing span{animation:1s infinite pulse}.error{color:#9f1d2f;background:#fff0f2;border-radius:12px;padding:12px 16px}.composer{border-top:1px solid var(--line);background:#fff;grid-template-columns:minmax(0,1fr) auto;gap:10px;padding:14px max(24px,50% - 420px) 28px;display:grid;position:relative}.composer textarea{resize:vertical;border:1px solid #cfd7e5;border-radius:16px;outline:none;min-height:54px;max-height:160px;padding:15px 17px}.composer textarea:focus{border-color:var(--blue);box-shadow:0 0 0 3px #165dff1a}.composer button{border-radius:16px;min-width:94px}.composer button:disabled{cursor:not-allowed;opacity:.45}.composer small{color:var(--muted);text-align:center;grid-column:1/-1}@keyframes pulse{50%{opacity:.35}}@media (max-width:760px){.app-shell{grid-template-columns:1fr}.sidebar{min-height:auto;padding:12px}.sidebar>div:first-child{justify-content:space-between;align-items:center;gap:10px;display:flex}.brand{padding:0}.brand span,.status{display:none}.new-chat{width:auto}.chat{height:calc(100vh - 68px)}.chat header{padding:12px 16px}.messages{padding:18px 14px}.hero{padding:18px 0}.composer{padding:12px 12px 18px}.lock-card{padding:32px 22px}}