:root{--bg: #f6f7f9;--surface: #ffffff;--border: #e2e5ea;--text: #1c2024;--muted: #6b7280;--primary: #2563eb;--primary-hover: #1d4ed8;--ok: #15803d;--ok-bg: #ecfdf3;--no: #b91c1c;--no-bg: #fef2f2;--radius: 8px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.5}h1,h2,h3{line-height:1.25}.mono{font-family:ui-monospace,SF Mono,Menlo,Consolas,monospace}.small{font-size:13px}.muted{color:var(--muted)}.sso-divider{text-align:center;font-size:.85rem;margin:0}.error{color:var(--no);background:var(--no-bg);border:1px solid #fecaca;padding:10px 12px;border-radius:var(--radius)}.app{min-height:100vh}.topbar{display:flex;align-items:center;gap:24px;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border)}.brand{font-weight:700}.nav{display:flex;gap:4px;flex:1}.nav a{padding:6px 12px;border-radius:var(--radius);color:var(--muted);text-decoration:none;font-weight:500}.nav a:hover{background:var(--bg);color:var(--text)}.nav a.active{background:#eef2ff;color:var(--primary)}.account{display:flex;align-items:center;gap:12px}.content{max-width:760px;margin:0 auto;padding:28px 24px 64px}.page{display:flex;flex-direction:column;gap:16px}.centered{display:grid;place-items:center;min-height:60vh}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.stack{display:flex;flex-direction:column;gap:14px}.row{display:flex;gap:10px;flex-wrap:wrap}.row-between{display:flex;align-items:center;justify-content:space-between;gap:12px}.field{display:flex;flex-direction:column;gap:6px}.field>span{font-size:13px;font-weight:600;color:var(--muted)}input,textarea{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:9px 11px;width:100%}textarea{resize:vertical}input:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb26}.btn{font:inherit;font-weight:600;border-radius:var(--radius);padding:9px 16px;border:1px solid transparent;cursor:pointer}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}.btn-ghost:hover:not(:disabled){background:var(--bg)}.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-card{width:100%;max-width:380px}.auth-title{margin:0 0 18px;font-size:22px}.hint{font-size:12px;margin:4px 0 0}.badge{display:inline-block;background:#eef2ff;color:var(--primary);border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600}.item-head{display:flex;align-items:center;gap:10px}.prompt{font-size:16px;margin:0}.result-card{border-left:4px solid var(--border)}.result-ok{border-left-color:var(--ok);background:var(--ok-bg)}.result-no{border-left-color:var(--no);background:var(--no-bg)}.verdict{font-weight:700;font-size:13px;text-transform:uppercase;letter-spacing:.03em}.verdict.ok{color:var(--ok)}.verdict.no{color:var(--no)}.mastery{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-top:8px}.mastery-line{margin:6px 0 0}.history{display:flex;flex-direction:column;gap:8px}.history-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.history-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:12px 14px}.table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.table th,.table td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border);vertical-align:top}.table th{font-size:12px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted);background:var(--bg)}.table tr:last-child td{border-bottom:none}.pre{white-space:pre-wrap;word-break:break-word;margin:0;max-height:320px;overflow:auto}