:root{--bg:#fff;--bg-soft:#f6f7f9;--text:#1a1d21;--muted:#6b7280;--border:#e5e7eb;--accent:#4f46e5;--accent-soft:#eef2ff;--error:#b91c1c;--radius:10px;font-size:16px}*{box-sizing:border-box}body{color:var(--text);background:var(--bg);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.55}code,pre{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em}.topbar{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:.75rem 1.5rem;display:flex}.brand{letter-spacing:-.01em;font-weight:700}.brand-tld{color:var(--muted);font-weight:600}.privacy-badge{color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:.25rem .6rem;font-size:.8rem}#landing{max-width:860px;margin:0 auto;padding:3rem 1.5rem 4rem}.hero{text-align:center}.hero h1{letter-spacing:-.02em;margin:0 0 .75rem;font-size:2.2rem}.subtitle{color:var(--muted);max-width:560px;margin:0 auto 2rem}#dropzone{border:2px dashed var(--border);border-radius:var(--radius);cursor:pointer;background:var(--bg-soft);padding:3rem 1.5rem;transition:border-color .15s,background .15s}#dropzone:hover,#dropzone:focus-visible,#dropzone.dragover{border-color:var(--accent);background:var(--accent-soft);outline:none}.dz-main{margin:0 0 .25rem;font-weight:600}.dz-sub{color:var(--muted);margin:0;font-size:.9rem}.error{color:var(--error);font-size:.9rem}.ghost-btn{border:1px solid var(--border);cursor:pointer;color:var(--text);background:0 0;border-radius:8px;margin-top:1.25rem;padding:.5rem 1rem;font-size:.9rem}.ghost-btn:hover{border-color:var(--accent);color:var(--accent)}.ghost-btn.small{margin:0;padding:.3rem .6rem;font-size:.8rem}.howto{flex-wrap:wrap;gap:2.5rem;margin-top:4rem;display:flex}.howto-col{flex:280px}.howto-col h2{font-size:1.05rem}.howto-col ol{color:var(--muted);padding-left:1.2rem}.site-footer{text-align:center;color:var(--muted);margin-top:4rem;font-size:.85rem}#app{height:calc(100vh - 53px);display:flex}.sidebar{border-right:1px solid var(--border);background:var(--bg-soft);flex-direction:column;width:320px;min-width:240px;display:flex}.sidebar-top{border-bottom:1px solid var(--border);flex-direction:column;gap:.5rem;padding:.75rem;display:flex}#search{border:1px solid var(--border);border-radius:8px;padding:.5rem .7rem;font-size:.9rem}#search:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.muted{color:var(--muted);margin:0;font-size:.8rem}#conv-list{flex:1;padding:.5rem;overflow-y:auto}.conv-item{text-align:left;cursor:pointer;width:100%;color:var(--text);background:0 0;border:none;border-radius:8px;padding:.55rem .7rem;font-size:.9rem;display:block}.conv-item:hover{background:#eceef2}.conv-item.selected{background:var(--accent-soft);color:var(--accent)}.conv-item .conv-item-title{white-space:nowrap;text-overflow:ellipsis;font-weight:500;display:block;overflow:hidden}.conv-item .conv-item-date{color:var(--muted);font-size:.75rem}.sidebar-bottom{border-top:1px solid var(--border);padding:.75rem}.sidebar-bottom button,#export-md-btn{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;width:100%;padding:.55rem .9rem;font-size:.85rem}#export-md-btn{width:auto}.sidebar-bottom button:hover,#export-md-btn:hover{filter:brightness(1.1)}.conv-pane{flex:1;padding:1.5rem 2rem 3rem;overflow-y:auto}#conv-header{border-bottom:1px solid var(--border);max-width:760px;margin:0 auto 1.5rem;padding-bottom:1rem}#conv-header h2{letter-spacing:-.01em;margin:0 0 .5rem;font-size:1.35rem}.conv-actions{justify-content:space-between;align-items:center;gap:1rem;display:flex}#messages{max-width:760px;margin:0 auto}.placeholder{color:var(--muted);text-align:center;margin-top:4rem}.msg{border-radius:var(--radius);margin-bottom:1.25rem;padding:.9rem 1.1rem}.msg-user{background:var(--bg-soft)}.msg-assistant{border:1px solid var(--border);border-left:3px solid var(--accent)}.msg .msg-role{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:.35rem;font-size:.75rem;font-weight:700}.msg-assistant .msg-role{color:var(--accent)}.msg-body pre{color:#e2e8f0;background:#0f172a;border-radius:8px;padding:.9rem 1rem;overflow-x:auto}.msg-body pre code{color:inherit;background:0 0}.msg-body code{background:var(--bg-soft);border-radius:4px;padding:.1em .35em}.msg-body>:first-child{margin-top:0}.msg-body>:last-child{margin-bottom:0}@media (width<=720px){#app{flex-direction:column}.sidebar{width:100%;max-height:45vh}}