:root{--bg:#0f172a;--bg2:#1e293b;--card:#ffffff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--brand:#4f46e5;--brand2:#6366f1;--brand-ink:#ffffff;--ok:#16a34a;--err:#dc2626;--soft:#f8fafc}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang HK,Microsoft JhengHei,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:radial-gradient(1200px 600px at 50% -10%,#312e81 0,var(--bg) 45%);min-height:100vh;-webkit-font-smoothing:antialiased}.wrap{max-width:820px;margin:0 auto;padding:48px 20px 80px}.header{text-align:center;color:#e2e8f0;margin-bottom:28px}.header .school-logo{width:72px;height:auto;display:block;margin:0 auto 10px;filter:drop-shadow(0 6px 16px rgba(2,6,23,.45))}.header .school-name{font-size:17px;font-weight:700;color:#f1f5f9;letter-spacing:1px;margin-bottom:12px}.header h1{font-size:30px;margin:0 0 8px;letter-spacing:.5px}.header .badge{display:inline-block;font-size:12px;font-weight:600;color:#c7d2fe;background:rgba(99,102,241,.18);border:1px solid rgba(99,102,241,.4);padding:4px 12px;border-radius:999px;margin-bottom:14px}.header p{margin:0;color:#94a3b8;font-size:14px}.card{background:var(--card);border-radius:18px;padding:26px;box-shadow:0 20px 45px -20px rgba(2,6,23,.6)}.drop{border:2px dashed var(--line);border-radius:14px;padding:34px 20px;text-align:center;cursor:pointer;transition:all .15s ease;background:var(--soft)}.drop.over,.drop:hover{border-color:var(--brand2);background:#eef2ff}.drop .big{font-size:16px;font-weight:600;margin-bottom:6px}.drop .small{font-size:13px;color:var(--muted)}.filebox{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:14px 16px}.filebox .meta{min-width:0}.filebox .name{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.filebox .size{font-size:12px;color:var(--muted)}audio{width:100%;margin-top:14px}.grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:14px;gap:14px;margin-top:18px}@media (max-width:560px){.grid{grid-template-columns:1fr}}label.field{display:block;font-size:13px;font-weight:600;color:#334155;margin-bottom:6px}input,select,textarea{width:100%;font:inherit;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;outline:none}select:focus,textarea:focus{border-color:var(--brand2);box-shadow:0 0 0 3px rgba(99,102,241,.15)}textarea{resize:vertical;min-height:70px}.hint{font-size:12px;color:var(--muted);margin-top:6px}.actions{display:flex;gap:12px;margin-top:20px;flex-wrap:wrap}button{font:inherit;font-weight:600;border:none;border-radius:10px;padding:12px 20px;cursor:pointer;transition:transform .05s ease,opacity .15s ease,background .15s ease}button:active{transform:translateY(1px)}button:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--brand);color:var(--brand-ink);flex:1 1;min-width:180px}.btn-primary:hover:not(:disabled){background:var(--brand2)}.btn-ghost{background:#f1f5f9;color:#334155}.btn-ghost:hover:not(:disabled){background:#e2e8f0}.spinner{display:inline-block;width:16px;height:16px;border:2px solid rgba(255,255,255,.45);border-top-color:#fff;border-radius:50%;animation:spin .7s linear infinite;vertical-align:-3px;margin-right:8px}@keyframes spin{to{transform:rotate(1turn)}}.progress{margin-top:16px;background:#eef2ff;border-radius:999px;height:26px;position:relative;overflow:hidden;border:1px solid #e0e7ff}.progress-bar{height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:999px;transition:width .3s ease}.progress-text{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:600;color:#1e293b}.alert{margin-top:18px;border-radius:12px;padding:14px 16px;font-size:14px;line-height:1.5}.alert.err{background:#fef2f2;border:1px solid #fecaca;color:#991b1b}.alert.note{background:#fffbeb;border:1px solid #fde68a;color:#92400e}.result{margin-top:22px}.result .bar{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.result .bar h3{margin:0;font-size:16px}.result .bar .tools{display:flex;gap:8px}.result textarea{min-height:240px;line-height:1.7;font-size:15px}.count{text-align:right;font-size:12px;color:var(--muted);margin-top:6px}.footer{text-align:center;color:#64748b;font-size:12px;margin-top:30px;line-height:1.7}.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%);background:#0f172a;color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;box-shadow:0 10px 30px -10px rgba(0,0,0,.5);animation:pop .2s ease}@keyframes pop{0%{opacity:0;transform:translate(-50%,8px)}}