:root{--paper: #f7f4ec;--paper-deep: #efe9db;--ink: #2a2926;--ink-soft: #6f6a5e;--gold: #a98a5b;--line: #ddd6c4;--seal: #a63f2f}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%}body{background:var(--paper);background-image:radial-gradient(circle at 88% 6%,rgba(169,138,91,.09),transparent 42%);color:var(--ink);font-family:-apple-system,PingFang SC,Noto Sans CJK SC,sans-serif;-webkit-font-smoothing:antialiased}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;gap:10px;padding:10px 14px;border-bottom:1px solid var(--line);background:#f7f4eceb}.topbar h1{flex:1;text-align:center;font-family:Songti SC,STSong,serif;font-weight:600;font-size:20px;letter-spacing:10px}.tone-chip{font-size:12px;color:var(--ink-soft);border:1px solid var(--line);border-radius:999px;padding:2px 10px;white-space:nowrap}.icon-btn{background:none;border:none;font-size:18px;cursor:pointer;color:var(--ink);padding:4px}.icon-btn.small{font-size:14px;color:var(--ink-soft)}.btn{border:1px solid var(--ink);background:transparent;color:var(--ink);padding:8px 16px;border-radius:6px;cursor:pointer;font-size:14px}.btn.primary{background:var(--ink);color:var(--paper)}.btn.primary:disabled{opacity:.4;cursor:not-allowed}.btn.mini{padding:3px 10px;font-size:12px}.conn-banner{display:flex;align-items:center;justify-content:center;gap:12px;background:#f3e2d9;color:var(--seal);font-size:13px;padding:8px 14px;border-bottom:1px solid #e5c9bc}.btn.new{width:100%;margin-bottom:12px}.btn.ghost{border:none;text-align:left;padding:10px 6px;color:var(--ink-soft)}.btn.danger{color:var(--seal)}.drawer-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#2a292659;z-index:40}.drawer{position:absolute;left:0;top:0;bottom:0;width:min(82vw,320px);background:var(--paper);padding:14px;display:flex;flex-direction:column;border-right:1px solid var(--line);overflow-y:auto}.sess-list{flex:1;overflow-y:auto}.sess{display:flex;align-items:center;gap:8px;padding:10px 8px;border-bottom:1px dashed var(--line);cursor:pointer}.sess.active{background:var(--paper-deep);border-radius:6px}.sess-text{flex:1;min-width:0}.sess-title{font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sess-date{font-size:11px;color:var(--ink-soft);margin-top:2px}.drawer-foot{border-top:1px solid var(--line);margin-top:10px;padding-top:8px;display:flex;flex-direction:column}.chat{flex:1;display:flex;flex-direction:column;overflow:hidden}.msgs{flex:1;overflow-y:auto;padding:16px 14px 8px;max-width:720px;width:100%;margin:0 auto}.welcome{text-align:center;margin-top:14vh;color:var(--ink-soft)}.welcome p{margin-top:18px;line-height:2;font-family:Songti SC,STSong,serif}.seal{display:inline-block;width:56px;height:56px;line-height:56px;background:var(--seal);color:#f7f4ec;font-family:Songti SC,STSong,serif;font-size:30px;border-radius:8px;box-shadow:0 2px 8px #a63f2f59}.msg{margin-bottom:16px;animation:fadein .25s ease}@keyframes fadein{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}.msg.user{margin-left:auto;width:fit-content;max-width:82%;background:var(--ink);color:var(--paper);padding:10px 14px;border-radius:12px 12px 2px;font-size:15px;line-height:1.7;white-space:pre-wrap}.msg.assistant{max-width:100%;font-family:Songti SC,STSong,"Noto Serif CJK SC",serif;font-size:16px;line-height:2;color:var(--ink)}.msg.assistant .body{white-space:pre-wrap}.step-chip{display:inline-block;font-family:-apple-system,PingFang SC,sans-serif;font-size:11px;color:var(--gold);border:1px solid var(--gold);border-radius:999px;padding:1px 9px;margin-bottom:6px}.typing{color:var(--ink-soft);letter-spacing:4px;animation:pulse 1.2s ease infinite}@keyframes pulse{0%,to{opacity:.3}50%{opacity:1}}.composer{display:flex;gap:10px;padding:10px 14px calc(10px + env(safe-area-inset-bottom));max-width:720px;width:100%;margin:0 auto}.composer textarea{flex:1;resize:none;border:1px solid var(--line);background:var(--paper-deep);border-radius:8px;padding:10px 12px;font-size:15px;line-height:1.6;color:var(--ink);font-family:inherit;outline:none}.composer textarea:focus{border-color:var(--gold)}.hint{text-align:center;font-size:11px;color:var(--ink-soft);padding:0 14px 8px;opacity:.75}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#2a29268c;display:flex;align-items:center;justify-content:center;z-index:60;padding:20px}.modal{background:var(--paper);border-radius:10px;max-width:480px;width:100%;padding:22px;border:1px solid var(--line);box-shadow:0 12px 40px #0003}.modal h2{font-family:Songti SC,STSong,serif;font-size:18px;letter-spacing:2px;margin-bottom:14px;text-align:center}.modal-body p{font-size:13.5px;line-height:1.9;color:var(--ink-soft);margin-bottom:10px}.modal-body b{color:var(--ink)}.modal-actions{margin-top:8px;text-align:center}