:root { --paper:#f4efe4; --ink:#1c1917; --teal:#0f766e; }
*{box-sizing:border-box}
body{margin:0;color:var(--ink);font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;
background:radial-gradient(1200px 500px at 10% -10%,#d7f0ea 0%,transparent 55%),
radial-gradient(900px 400px at 100% 0%,#fde7d4 0%,transparent 50%),var(--paper)}
h1{font-size:2.4rem;margin:.2rem 0}
h2{margin:1.4rem 0 .6rem}
a{color:inherit}
.wrap{max-width:1100px;margin:0 auto;padding:2rem 1.2rem 4rem}
.wrap.wide{max-width:1200px}
.wrap.narrow{max-width:420px;min-height:100vh;display:flex;flex-direction:column;justify-content:center}
.wrap.narrowish{max-width:760px}
.hero{min-height:100vh;display:flex;flex-direction:column;justify-content:center}
.kicker{letter-spacing:.2em;font-weight:700;color:#115e59;font-size:.8rem}
.lead{font-size:1.15rem;line-height:1.8;max-width:36rem;color:#57534e}
.actions{display:flex;gap:.7rem;flex-wrap:wrap;margin:1.4rem 0 2rem}
.card{background:rgba(255,252,247,.92);border:1px solid rgba(28,25,23,.08);box-shadow:0 10px 30px rgba(28,25,23,.06);border-radius:20px;padding:1.1rem}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:14px;padding:.7rem 1rem;font-weight:700;border:0;cursor:pointer;text-decoration:none;font-size:1rem}
.btn.primary{background:var(--teal);color:#fff}
.btn.danger{background:#b91c1c;color:#fff}
.btn.ghost{background:#fff;border:1px solid rgba(28,25,23,.12)}
.grid2{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid3{display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid4{display:grid;gap:.8rem;grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
.row{display:flex;gap:.7rem;align-items:end;flex-wrap:wrap}
.row.between{justify-content:space-between;align-items:flex-end}
.form label{display:block;font-weight:700;font-size:.9rem}
.form input,.form select,select,input[type=text],input[type=number],input[type=password]{
width:100%;margin-top:.3rem;border:1px solid #e7e5e4;border-radius:12px;padding:.55rem .7rem;font:inherit;background:#fff}
.muted{color:#78716c;font-size:.9rem;text-decoration:none}
.error{color:#b91c1c;font-weight:700}
.pill{background:#f0fdfa;color:#115e59;border-radius:999px;padding:.2rem .7rem;font-size:.85rem;font-weight:700}
.term-switch{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.4rem;margin-top:1rem}
.term-switch button{width:100%;border:0;border-radius:16px;padding:.9rem .4rem;font-weight:800;background:#f5f5f4;cursor:pointer}
.term-switch button.on{background:#0f766e;color:#fff}
.class-card{text-decoration:none;display:block}
.class-card h3{font-size:1.5rem;margin:.2rem 0}
.accent{color:#0f766e;font-weight:800}
.score{font-size:2.4rem;font-weight:900;margin:.2rem 0;color:#115e59}
.score.neg{color:#b91c1c}
.score-sm{font-size:1.5rem;font-weight:900;margin:.2rem 0}
.line{border-top:1px solid #f5f5f4;padding:.7rem 0}
.plus{color:#0f766e;font-weight:900;font-size:1.2rem}
.minus{color:#b91c1c;font-weight:900;font-size:1.2rem}
.tabs{display:flex;gap:.4rem;flex-wrap:wrap;margin:1rem 0}
.tabs button{border:0;border-radius:999px;padding:.45rem 1rem;font-weight:800;background:#fff;cursor:pointer}
.tabs button.on{background:#1c1917;color:#fff}
.term-pills button{border:0;border-radius:16px;padding:.45rem .9rem;font-weight:800;margin-left:.3rem;cursor:pointer;background:#fff}
.term-pills button.on{background:#0f766e;color:#fff}
.sub{font-size:1.1rem;color:#78716c;font-weight:700}
.msg{font-weight:700;color:#0f766e;min-height:1.2rem}
.student-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.6rem}
.stu{border:1px solid #e7e5e4;background:#fff;border-radius:16px;padding:.8rem;text-align:left;cursor:pointer}
.stu.on{border-color:#0f766e;background:#f0fdfa}
.stu .no{color:#78716c;font-size:.75rem}
.stu .nm{font-weight:800;font-size:1.05rem;margin:.2rem 0}
.workspace{display:grid;grid-template-columns:1fr 280px;gap:1rem}
@media(max-width:900px){.workspace{grid-template-columns:1fr}}
.aside{position:sticky;top:1rem;height:fit-content}
.preset{color:#fff;border:0;border-radius:12px;padding:.7rem .4rem;font-weight:800;cursor:pointer}
.spin{font-size:3rem;font-weight:900}
.flash{animation:flash .08s linear infinite}
@keyframes flash{50%{opacity:.35}}
.table{width:100%;border-collapse:collapse;font-size:.92rem}
.table th{text-align:left;color:#78716c;padding:.7rem}
.table td{padding:.7rem;border-top:1px solid #f5f5f4}
.linkish{background:none;border:0;color:#0f766e;font-weight:800;cursor:pointer}
.grow{flex:1}