.history-button{border:1px solid var(--line);background:#fff;color:var(--green);border-radius:10px;padding:9px 14px;font-weight:700;cursor:pointer}.history-drawer{position:fixed;inset:0;background:rgba(12,29,22,.46);z-index:60;display:flex;justify-content:flex-end}.history-sheet{width:min(820px,92vw);height:100dvh;background:var(--paper);padding:24px;overflow:auto;box-shadow:-20px 0 60px rgba(23,76,59,.18)}.history-sheet>header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:18px}.history-sheet h3{margin:0 0 5px;font-size:23px}.history-sheet header p{margin:0;color:var(--muted);font-size:13px}.history-sheet header button{border:1px solid var(--line);background:#fff;width:40px;height:40px;border-radius:10px;font-size:24px;cursor:pointer}.history-layout{display:grid;grid-template-columns:280px 1fr;gap:14px}.history-list,.history-detail{background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px}.history-item{display:block;width:100%;text-align:left;border:0;background:transparent;padding:13px;border-radius:10px;cursor:pointer}.history-item:hover,.history-item.active{background:#e8f2eb}.history-item b,.history-item small{display:block}.history-item small{color:var(--muted);margin-top:5px}.history-score{float:right;color:var(--green);font-weight:900}.history-score.muted{color:#7a867f;font-weight:600}.history-empty{color:var(--muted);padding:24px 10px;text-align:center}.history-message{padding:11px 13px;border-radius:11px;margin:9px 0;white-space:pre-wrap;line-height:1.55}.history-message.user{background:var(--green);color:#fff;margin-left:18%}.history-message.assistant{background:#edf3ef;margin-right:12%}.history-assessment{margin-top:18px}.history-assessment .result{margin:0}@media(max-width:800px){.speaking-actions{grid-template-columns:repeat(3,1fr)}.history-button,.score-conversation,.speaking-actions .secondary{padding:7px 5px;font-size:12px}.history-sheet{width:100%;padding:18px 14px}.history-layout{display:block}.history-list{display:flex;overflow-x:auto;gap:8px;margin-bottom:12px}.history-item{min-width:190px}.history-detail{min-height:50dvh}}