:root{--bg:#f7fbfb;--bg-soft:#eaf8f7;--panel:#ffffff;--text:#102a2c;--muted:#597678;--line:#d8eceb;--accent:#198f8e;--accent-dark:#147877;--lime:#d7f53a;--shadow:0 18px 45px rgba(16,42,44,.10)}*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,sans-serif;background:linear-gradient(180deg,#ffffff 0%,var(--bg-soft) 52%,#ffffff 100%);color:var(--text)}a{color:inherit}.hidden{display:none!important}.shell{min-height:100vh;padding:28px}.auth-shell,.chat-shell{min-height:calc(100vh - 56px);display:flex;align-items:center;justify-content:center}.auth-card,.chat-card{background:var(--panel);border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow)}.auth-card{width:min(100%,520px);padding:34px;position:relative;overflow:hidden}.auth-card:before{content:'';position:absolute;inset:-80px auto auto -40px;width:220px;height:220px;background:radial-gradient(circle,rgba(25,143,142,.18) 0%,rgba(25,143,142,0) 72%);pointer-events:none}.badge{display:inline-block;padding:7px 12px;border-radius:999px;background:#dff4f3;color:var(--accent-dark);font-size:12px;font-weight:800;margin-bottom:18px}.auth-card h1{margin:0 0 10px;font-size:36px;line-height:1.05;letter-spacing:-.03em}.subtle{color:var(--muted);margin:0 0 20px;max-width:38ch;font-size:15px;line-height:1.55}form{display:flex;gap:12px;flex-direction:column}input{width:100%;padding:15px 16px;border-radius:16px;border:1px solid var(--line);background:#fff;color:var(--text);font-size:15px;box-shadow:inset 0 1px 0 rgba(255,255,255,.8)}input:focus{outline:2px solid rgba(25,143,142,.18);border-color:rgba(25,143,142,.35)}button,.button{padding:14px 18px;border-radius:16px;border:0;background:var(--accent);color:#fff;font-weight:800;font-size:15px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px}.button:hover,button:hover{background:var(--accent-dark)}.button.secondary,.link-button{background:#fff;border:1px solid rgba(25,143,142,.18);color:var(--accent-dark)}.button.lime{background:var(--lime);color:#163436}.button.lime:hover{background:#c9eb2a}.notice{margin-top:16px;padding:14px;border:1px solid var(--line);border-radius:16px;background:#f4fbfa;color:var(--muted)}.brand-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.brand-links .button{flex:1 1 180px}.chat-card{width:min(100%,980px);height:min(88vh,780px);display:flex;flex-direction:column;overflow:hidden;background:linear-gradient(180deg,#ffffff 0%,#f7fbfb 100%)}.chat-head{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#ffffff 0%,#f5fbfb 100%)}.chat-title{font-size:22px;font-weight:800;letter-spacing:-.02em}.chat-subtitle{font-size:13px;color:var(--muted);margin-top:4px}.messages{flex:1;padding:24px;overflow:auto;background:linear-gradient(180deg,#ffffff 0%,#f6fbfb 100%)}.msg{display:flex;margin:0 0 16px}.msg.user{justify-content:flex-end}.bubble{max-width:min(80%,720px);padding:13px 15px;border-radius:20px;line-height:1.5;box-shadow:0 10px 24px rgba(16,42,44,.06)}.msg.user .bubble{background:var(--accent);color:#fff;border-bottom-right-radius:8px}.msg.assistant .bubble{background:#fff;color:var(--text);border:1px solid var(--line);border-bottom-left-radius:8px}.chat-form{display:flex;gap:12px;padding:18px 24px;border-top:1px solid var(--line);background:#fff}.chat-form input{flex:1}.chat-form button{min-width:132px}.link-button{padding:11px 16px;background:#fff}.link-button:hover{background:#f3fbfb}.chat-form button,.auth-card form button{box-shadow:0 12px 28px rgba(25,143,142,.18)}@media(max-width:720px){.shell{padding:0}.auth-shell,.chat-shell{min-height:100vh}.auth-card,.chat-card{width:100%;height:100vh;border-radius:0;box-shadow:none}.auth-card{padding:28px 22px}.brand-links{flex-direction:column}.chat-head,.messages,.chat-form{padding-left:16px;padding-right:16px}}