:root{color-scheme:light dark;--bg: #0f1419;--panel: #1a2332;--text: #e7eef8;--muted: #9aadc2;--accent: #3d8bfd;--accent-dim: #1e4f8c;--danger: #f07178;--border: #2b3a4f;--user: #243447;--assistant: #1b2838;--system: transparent;font-family:Segoe UI,system-ui,sans-serif;line-height:1.45}@media(prefers-color-scheme:light){:root{--bg: #f4f7fb;--panel: #ffffff;--text: #152033;--muted: #5b6b7c;--accent: #1a6fe8;--accent-dim: #d6e6ff;--danger: #b42318;--border: #d5dee8;--user: #e8f0ff;--assistant: #f0f3f7}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);min-height:100vh}button,input,textarea{font:inherit;color:inherit}.centered{min-height:100vh;display:grid;place-items:center;padding:1.5rem}.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1.25rem;box-shadow:0 8px 24px #0000001f}.auth-panel{width:min(420px,100%)}.honesty-box{margin:.85rem 0 0;padding:.75rem .9rem;border:1px solid var(--border);border-radius:8px;background:color-mix(in srgb,var(--accent-dim) 35%,transparent);font-size:.88rem}.honesty-box ul{margin:.4rem 0 0;padding-left:1.15rem}.honesty-box li{margin:.2rem 0}.honesty-inline{margin:.25rem 0 0;max-width:42rem}.voice-controls{display:flex;flex-wrap:wrap;gap:.4rem;margin:.5rem 0}.voice-mic.active{background:#c23b3b;border-color:#c23b3b;color:#fff}.voice-status{margin:0;font-size:.9rem;color:var(--accent)}h1,h2{margin:0 0 .5rem;font-weight:650}.muted{color:var(--muted)}.small{font-size:.85rem}.tabs{display:flex;gap:.5rem;margin:1rem 0}.tab,.chip,button{border:1px solid var(--border);background:transparent;border-radius:999px;padding:.45rem .9rem;cursor:pointer}.tab.active,.chip.active,button[type=submit]{background:var(--accent);border-color:var(--accent);color:#fff}button:disabled{opacity:.55;cursor:not-allowed}button.ghost{background:transparent}.form{display:grid;gap:.85rem}.form label{display:grid;gap:.35rem;font-size:.9rem}.form input,.composer textarea{border:1px solid var(--border);border-radius:8px;padding:.6rem .75rem;background:transparent}.error{color:var(--danger);margin:.25rem 0}.tutor-layout{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;border-bottom:1px solid var(--border);background:var(--panel)}.tutor-body{flex:1;display:grid;grid-template-columns:minmax(220px,280px) 1fr;gap:1rem;padding:1rem;min-height:0}@media(max-width:800px){.tutor-body{grid-template-columns:1fr}}.sidebar h2{font-size:.95rem;margin-top:1rem}.mode-list{display:flex;flex-wrap:wrap;gap:.4rem}.sample-list{list-style:none;padding:0;margin:.5rem 0 0;display:grid;gap:.35rem}.linkish{border:none;background:none;padding:0;text-align:left;color:var(--accent);cursor:pointer;border-radius:0}.chat{display:flex;flex-direction:column;min-height:70vh;gap:.75rem}.messages{flex:1;overflow:auto;display:flex;flex-direction:column;gap:.65rem;padding:.25rem}.bubble{max-width:min(720px,100%);padding:.75rem .9rem;border-radius:10px;white-space:pre-wrap;border:1px solid var(--border)}.bubble.user{align-self:flex-end;background:var(--user)}.bubble.assistant{align-self:flex-start;background:var(--assistant)}.bubble.system{align-self:stretch;background:var(--system);border-style:dashed;color:var(--muted);font-size:.92rem}.composer{display:grid;gap:.5rem}.composer-actions{display:flex;justify-content:flex-end;gap:.5rem}