:root{--bg: #f7f8fa;--panel: #ffffff;--ink: #1b2733;--ink-soft: #5a6b7b;--line: #e6e9ee;--accent: #0f8f83;--accent-ink: #0b6b62;--side: #14171f;--side-2: #1e232e;--side-ink: #c9d2de;--side-ink-soft: #8b95a4;--danger: #c0392b;font-synthesis:none;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}.app{display:grid;grid-template-columns:264px 1fr;height:100vh;overflow:hidden}.sidebar{background:var(--side);color:var(--side-ink);display:flex;flex-direction:column;padding:14px 12px;gap:10px}.brand{display:flex;align-items:center;gap:9px;padding:6px 8px 10px;font-weight:700;font-size:18px;color:#fff}.brand-mark{color:var(--accent);font-size:22px}.new-chat{display:flex;align-items:center;gap:8px;background:var(--side-2);color:#fff;border:1px solid #2b3242;border-radius:10px;padding:10px 12px;font-size:14px;cursor:pointer;text-align:left}.new-chat:hover{background:#262c3a}.search{background:#0e1118;border:1px solid #2b3242;color:var(--side-ink);border-radius:9px;padding:9px 11px;font-size:13px;outline:none}.search::placeholder{color:var(--side-ink-soft)}.recents{flex:1;overflow-y:auto;margin-top:6px;display:flex;flex-direction:column;gap:2px}.recents-label{font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--side-ink-soft);padding:6px 8px}.recents-empty{font-size:13px;color:var(--side-ink-soft);padding:4px 8px}.recent-item{background:none;border:none;color:var(--side-ink);text-align:left;padding:8px 9px;border-radius:8px;font-size:13px;cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.recent-item:hover{background:var(--side-2)}.recent-item.active{background:#2a3140;color:#fff}.account{display:flex;align-items:center;gap:9px;margin-top:8px;background:none;border:none;color:var(--side-ink);cursor:pointer;padding:8px;border-radius:9px;font-size:13px}.account:hover{background:var(--side-2)}.avatar{width:26px;height:26px;border-radius:50%;background:var(--accent);color:#04231f;display:grid;place-items:center;font-weight:700;font-size:13px}.main{display:flex;flex-direction:column;min-width:0;height:100vh}.main-scroll{flex:1;overflow-y:auto;padding:22px 26px 8px}.error{background:#fdecea;color:var(--danger);border:1px solid #f5c6c0;padding:10px 12px;border-radius:10px;margin-bottom:12px;font-size:13px}.loading{color:var(--ink-soft);font-size:14px;padding:12px 2px}.assistant-note{max-width:720px;margin:10px auto 0;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;font-size:14px;color:var(--ink);line-height:1.5}.hero{max-width:680px;margin:8vh auto 0;text-align:center}.hero-mark{font-size:46px;color:var(--accent)}.hero h1{font-size:27px;margin:12px 0 8px;letter-spacing:-.01em}.hero-sub{color:var(--ink-soft);font-size:15px;line-height:1.55;margin:0 auto 22px;max-width:560px}.examples{display:flex;flex-direction:column;gap:8px;align-items:center}.example{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:11px 14px;font-size:14px;color:var(--ink);cursor:pointer;width:100%;max-width:460px;text-align:left;transition:border-color .15s}.example:hover{border-color:var(--accent)}.stage-wrap{max-width:920px;margin:0 auto}.stage-title{text-align:center;font-size:20px;font-weight:650;margin:2px 0 10px}.stage-row{display:flex;align-items:center;gap:6px}.nav-arrow{flex:0 0 auto;width:44px;height:44px;border-radius:50%;border:1px solid var(--line);background:var(--panel);color:var(--ink);font-size:26px;line-height:1;cursor:pointer;display:grid;place-items:center}.nav-arrow:hover:not(:disabled){border-color:var(--accent);color:var(--accent-ink)}.nav-arrow:disabled{opacity:.35;cursor:default}.stage-canvas{flex:1;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:8px;min-width:0}.stage{width:100%;height:auto;max-height:45vh;display:block}.stage-step{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:10px;font-size:13.5px;color:var(--ink);flex-wrap:wrap}.chem-badge{font-size:11.5px;padding:3px 9px;border-radius:999px;font-weight:600;cursor:help}.chem-badge.ok{background:#e7f6ef;color:#0b7a53;border:1px solid #bfe6d4}.chem-badge.bad{background:#fdecea;color:var(--danger);border:1px solid #f5c6c0}.jumpstrip{display:flex;gap:7px;justify-content:center;margin:12px 0 6px;flex-wrap:wrap}.jump-dot{width:11px;height:11px;border-radius:50%;border:1px solid #c4ccd6;background:#fff;cursor:pointer;padding:0}.jump-dot:hover{border-color:var(--accent)}.jump-dot.active{background:var(--accent);border-color:var(--accent)}.ai-explanation{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 16px;max-width:820px;margin:10px auto}.ai-label{font-size:11px;letter-spacing:.05em;text-transform:uppercase;color:var(--accent-ink);font-weight:700;margin-bottom:6px}.ai-explanation p{margin:0;font-size:14.5px;line-height:1.6;color:var(--ink)}.stage-controls{display:flex;gap:10px;justify-content:center;margin:6px 0 2px}.ctl{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:10px;padding:8px 16px;font-size:13.5px;cursor:pointer}.ctl:hover:not(:disabled){border-color:var(--accent)}.ctl:disabled{opacity:.4;cursor:default}.ctl.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.ctl.primary:hover{background:var(--accent-ink)}.ctl.on{border-color:var(--accent);color:var(--accent-ink)}.key-popover{display:flex;justify-content:center;margin-top:8px}.legend{display:flex;flex-wrap:wrap;gap:14px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 14px;font-size:12px;color:var(--ink-soft)}.legend-title{font-weight:700;color:var(--ink)}.legend-item{display:inline-flex;align-items:center;gap:6px}.chatbar{padding:10px 26px 20px}.chip{display:inline-flex;align-items:center;gap:8px;margin-bottom:8px;background:#eef6f4;border:1px solid #cfe6e0;color:var(--accent-ink);border-radius:999px;padding:4px 10px;font-size:12.5px}.chip button{border:none;background:none;cursor:pointer;color:var(--accent-ink);font-size:15px;line-height:1}.chatbar-row{display:flex;align-items:flex-end;gap:8px;max-width:820px;margin:0 auto;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:8px 8px 8px 10px;box-shadow:0 1px 3px #141e2d0d}.plus,.send{flex:0 0 auto;width:38px;height:38px;border-radius:10px;cursor:pointer;font-size:18px;display:grid;place-items:center;border:1px solid var(--line);background:#fff;color:var(--ink)}.plus:hover{border-color:var(--accent);color:var(--accent-ink)}.send{background:var(--accent);color:#fff;border-color:var(--accent)}.send:hover:not(:disabled){background:var(--accent-ink)}.send:disabled{opacity:.5;cursor:default}.chat-input{flex:1;border:none;outline:none;resize:none;font:inherit;font-size:14.5px;color:var(--ink);background:transparent;padding:9px 4px;max-height:140px;line-height:1.4}.chat-input::placeholder{color:#9aa6b2}