*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background:#f3f4f6;color:#111827}button,input,textarea{font:inherit}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{background:#01145f;color:#fff;padding:14px 16px;font-weight:700}.chat-list{display:flex;flex-direction:column;gap:8px;padding:12px}.chat-item{border:1px solid #e5e7eb;background:#fff;border-radius:14px;padding:12px 14px;text-align:left}.chat-item-title{font-weight:600;margin-bottom:4px}.chat-item-meta{font-size:12px;color:#6b7280}.chat-view{display:flex;flex-direction:column;min-height:calc(100vh - 52px)}.messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}.message{max-width:85%;border-radius:14px;padding:10px 12px;background:#fff;border:1px solid #e5e7eb}.message.own{align-self:flex-end;background:#eaf2ff;border-color:#bfdbfe}.composer{display:flex;gap:8px;padding:12px;border-top:1px solid #e5e7eb;background:#fff}.composer input{flex:1;border:1px solid #d1d5db;border-radius:999px;padding:10px 14px}.composer button{border:none;background:#305dff;color:#fff;border-radius:999px;padding:0 16px;font-weight:600}.state-box{padding:24px 16px;text-align:center;color:#4b5563}.back-btn{margin:12px;align-self:flex-start;border:1px solid #d1d5db;background:#fff;border-radius:999px;padding:8px 12px}