:root{--bg:#f6f5f9;--surface:#fff;--text:#1f1d2b;--muted:#6b6880;--border:#e2e0ea;--accent:#5b3fd1;--accent-soft:#eeeafd;--danger:#b4233c;--user-bubble:#eeeafd;--radius:12px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Hiragino Sans,Noto Sans JP,Yu Gothic UI,system-ui,sans-serif;font-size:15px;line-height:1.75}button{font:inherit;cursor:pointer}textarea,input,select{font:inherit;color:inherit}.btn{border:1px solid var(--border);background:var(--surface);white-space:nowrap;border-radius:8px;padding:6px 14px}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn.danger{color:var(--danger);border-color:#efc7cf}.btn.ghost{border-color:#0000}.btn.big{padding:10px 24px;font-size:16px}.brand{align-items:center;gap:8px;font-weight:700;display:flex}.brand.center{justify-content:center;font-size:20px}.logo{background:var(--accent);color:#fff;letter-spacing:.05em;border-radius:6px;padding:0 6px;font-size:13px}.login{place-items:center;min-height:100vh;padding:16px;display:grid}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:14px;width:100%;max-width:380px;padding:32px 28px;display:flex}.login-card label{flex-direction:column;gap:4px;font-size:14px;display:flex}.login-card input{border:1px solid var(--border);border-radius:8px;padding:8px 10px}.lead{text-align:center;color:var(--muted);margin:0;font-size:14px}.notice{background:var(--accent-soft);border-radius:8px;margin:0;padding:8px 12px;font-size:13px}.fineprint{color:var(--muted);margin:0;font-size:12px}.error{color:var(--danger);white-space:pre-wrap;margin:4px 0;font-size:14px}.app{flex-direction:column;min-height:100vh;display:flex}.topbar{background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;padding:10px 20px;display:flex}.topbar-right{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.user{color:var(--muted);font-size:13px}.mode-switch{color:var(--muted);align-items:center;gap:6px;font-size:13px;display:flex}.mode-switch select{border:1px solid var(--border);background:var(--surface);border-radius:6px;padding:2px 6px}.privacy{color:var(--muted);text-align:center;background:var(--accent-soft);padding:6px 16px;font-size:12px}.idle-warning{background:#fff4d6;border-bottom:1px solid #f0d58a;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;padding:10px 16px;font-size:14px;display:flex}.start{width:100%;max-width:760px;margin:0 auto;padding:32px 16px 64px}.start h1{margin:0 0 20px;font-size:22px}.mode-cards{grid-template-columns:1fr 1fr;gap:14px;display:grid}.mode-card{text-align:left;background:var(--surface);border:2px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:6px;padding:18px;display:flex}.mode-card strong{font-size:17px}.mode-card span:last-child{color:var(--muted);font-size:14px}.mode-card.selected{border-color:var(--accent);background:var(--accent-soft)}.tag{background:var(--accent);color:#fff;border-radius:50%;place-items:center;width:26px;height:26px;font-size:14px;font-weight:700;display:inline-grid}.form{flex-direction:column;gap:18px;margin-top:24px;display:flex}.form label{flex-direction:column;gap:6px;font-weight:600;display:flex}.form small{color:var(--muted);font-size:13px;font-weight:400}.form textarea{border:1px solid var(--border);background:var(--surface);resize:vertical;border-radius:8px;padding:10px 12px;font-weight:400}.form input[type=file]{font-size:13px;font-weight:400}.form .btn.big{align-self:flex-start}.chat-layout{flex:1;gap:0;min-height:0;display:flex}.chat{flex-direction:column;flex:1;min-width:0;height:calc(100vh - 90px);display:flex}.messages{flex-direction:column;flex:1;gap:14px;width:100%;max-width:860px;margin:0 auto;padding:20px 16px;display:flex;overflow-y:auto}.msg{border-radius:var(--radius);max-width:100%;padding:12px 16px}.msg.user{background:var(--user-bubble);align-self:flex-end;max-width:85%}.msg.assistant{background:var(--surface);border:1px solid var(--border)}.user-text{white-space:pre-wrap;margin:0;font-family:inherit}.thinking{color:var(--muted);font-size:14px}.composer{border-top:1px solid var(--border);background:var(--surface);align-items:flex-end;gap:10px;padding:12px 16px;display:flex}.composer textarea{border:1px solid var(--border);resize:vertical;border-radius:8px;flex:1;padding:8px 10px}.composer-actions{flex-direction:column;gap:6px;display:flex}.sheet{border-left:1px solid var(--border);background:var(--surface);width:46%;max-width:720px;height:calc(100vh - 90px);padding:16px 20px;overflow-y:auto}.sheet-actions{background:var(--surface);border-bottom:1px solid var(--border);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;padding:6px 0 10px;display:flex;position:sticky;top:-16px}.sheet-actions div{flex-wrap:wrap;gap:6px;display:flex}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md h1{font-size:20px}.md h2{margin-top:20px;font-size:17px}.md h3{font-size:15px}.md table{border-collapse:collapse;width:100%;margin:8px 0;font-size:13.5px;display:block;overflow-x:auto}.md th,.md td{border:1px solid var(--border);text-align:left;vertical-align:top;padding:6px 8px}.md th{background:var(--accent-soft)}.md blockquote{border-left:3px solid var(--accent);background:var(--accent-soft);margin:8px 0;padding:6px 14px}.md code{background:var(--accent-soft);border-radius:4px;padding:0 4px}@media (max-width:800px){.mode-cards{grid-template-columns:1fr}.chat-layout{flex-direction:column}.chat{height:auto;min-height:70vh}.sheet{border-left:none;border-top:1px solid var(--border);width:100%;max-width:none;height:auto}.composer{flex-direction:column;align-items:stretch}.composer-actions{flex-direction:row}}@media print{.no-print{display:none!important}body{background:#fff}.sheet{border:none;width:100%;max-width:none;height:auto;padding:0;overflow:visible}.chat-layout{display:block}}