:root{--bg:#f1f4f7;--surface:#fff;--ink:#1b2430;--muted:#5c6b7a;--line:#d6dee6;--faint:#8494a2;--accent:#1f5c8b;--accent-soft:#e4edf5;--mark:#b33f38;--shadow:0 1px 2px rgba(27,36,48,.06),0 10px 28px rgba(27,36,48,.08);--display:"Zilla Slab",Georgia,serif;--body:"Source Sans 3",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}@media (prefers-color-scheme:dark){:root{--bg:#131a21;--surface:#1b242c;--ink:#e6edf3;--muted:#9aaab8;--line:#2b3640;--faint:#78889a;--accent:#74b4e2;--accent-soft:#1e2e3c;--mark:#e5877f;--shadow:0 1px 2px rgba(0,0,0,.3),0 12px 30px rgba(0,0,0,.35)}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.55}h1,h2,h3{font-family:var(--display);margin:0;text-wrap:balance}a{color:var(--accent)}.page{max-width:900px;margin:0 auto;padding:40px 16px 24px}@media (max-width:600px){.page{padding-top:28px}}.hero{margin-bottom:28px}.hero h1{font-size:34px;font-weight:700;letter-spacing:-.015em;line-height:1.15}.hero p{color:var(--muted);font-size:17px;max-width:60ch;margin:10px 0 0}.eyebrow{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);background:var(--accent-soft);padding:4px 10px;border-radius:4px;margin-bottom:12px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));grid-gap:14px;gap:14px;margin:26px 0}.tile{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:16px}.tile h3{font-family:var(--body);font-size:15px;font-weight:700;margin-bottom:4px}.tile p{margin:0;color:var(--muted);font-size:14px}.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:24px;box-shadow:var(--shadow)}.card h2{font-size:20px;margin-bottom:4px}.card .lead{color:var(--muted);font-size:15px;margin:0 0 18px}label{display:block;font-weight:600;font-size:14px;margin:0 0 5px}input[type=text],select,textarea{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:7px;background:var(--bg);color:var(--ink);font:inherit}textarea{min-height:190px;resize:vertical;line-height:1.6}input::placeholder,textarea::placeholder{color:var(--faint,#8494a2);opacity:1}input:focus,select:focus,textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}.field{margin-bottom:16px}.row2{display:grid;grid-template-columns:200px 1fr;grid-gap:12px;gap:12px}@media (max-width:520px){.row2{grid-template-columns:1fr}}.opt{font-weight:400;color:var(--muted);font-size:12.5px;margin-left:6px}.grouplabel{display:block;font-weight:600;font-size:14px;margin:0 0 6px}.grades{display:flex;gap:8px;flex-wrap:wrap}.gradebtn{flex:1 1 60px;min-width:56px;padding:12px 0;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--muted);font-weight:700;font-size:16px;cursor:pointer}.gradebtn:hover{border-color:var(--accent);color:var(--accent)}.gradebtn.on{background:var(--accent);border-color:var(--accent);color:#fff}.gradebtn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.hint{color:var(--muted);font-size:13.5px;margin:6px 0 0}.wordshead{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:5px;flex-wrap:wrap}.wordshead label{margin:0}.btn.ghost{border-color:var(--line)}.btn.ghost:hover{border-color:var(--accent)}.btn.sm{width:auto;padding:7px 12px;font-size:13.5px;border-radius:6px}.chips{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}.chip{background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:3px 11px;font-size:13px;font-weight:600}.btn{border:1px solid var(--accent);background:var(--accent);color:#fff;font-weight:700;font-size:16px;padding:13px 22px;border-radius:8px;cursor:pointer;width:100%}.btn:disabled{opacity:.6;cursor:default}.btn:focus-visible{outline:2px solid var(--ink);outline-offset:2px}.btn.ghost{background:transparent;color:var(--accent)}.err{color:var(--mark);font-size:14.5px}.err,.note{margin-top:12px}.note{font-size:13.5px;text-align:center}.foot,.note{color:var(--muted)}.foot{max-width:900px;margin:0 auto;padding:28px 16px 56px;font-size:13px}.foot p{margin:4px 0 10px}.agree{display:flex;gap:10px;align-items:flex-start;margin:4px 0 14px;font-size:13.5px;color:var(--muted);line-height:1.45;cursor:pointer}.agree input{width:18px;height:18px;margin-top:2px;flex:none;accent-color:var(--accent)}.spin{display:inline-block;width:13px;height:13px;border:2px solid;border-right:2px solid transparent;border-radius:50%;margin-right:8px;vertical-align:-2px;animation:sp .8s linear infinite}@keyframes sp{to{transform:rotate(1turn)}}@media (prefers-reduced-motion:reduce){.spin{animation-duration:2.4s}}a.btn{display:block;text-align:center;text-decoration:none}.howto{margin-top:16px;text-align:left;font-size:14px;line-height:1.55;color:var(--muted);background:rgba(0,0,0,.03);border-radius:10px;padding:12px 14px}.howto strong{color:var(--ink)}