:root{--ink:#173c49;--muted:#4f6570;--accent:#176379;--soft:#e0eff0;--paper:#fafcfc;--yellow:#f5d176;--line:#d2e0e2}.bridge-board{display:grid;grid-template-columns:1fr 52px 1fr;min-height:245px;background:#3e6375;border:1px solid #9fc5d2;border-radius:10px;overflow:hidden}.bank{background:#edf2d8;padding:16px;display:flex;flex-direction:column;gap:9px}.bank h4{margin:0 0 6px;font-size:16px}.person{border:1px solid #c4cfaa;background:white;padding:8px;border-radius:6px;font-size:16px}.bridge-span{display:flex;align-items:center;justify-content:center;color:#f5d176;font-size:34px}.travelers{display:flex;flex-wrap:wrap;gap:9px 16px;border:0;padding:0;margin:14px 0}.travelers legend{font-weight:bold;font-size:16px;margin-bottom:10px}.travelers label{font-size:16px;padding:4px 0;cursor:pointer}.travelers input{accent-color:var(--accent)}.travelers label:has(input:disabled){opacity:.5}.bridge-notice{font-size:16px;min-height:70px;margin:16px 0;background:var(--soft);padding:16px;border-radius:8px;overflow-wrap:anywhere}.move-list{font-size:15px;padding:0;list-style:none;max-height:250px;overflow:auto}.move-list li{padding:7px 0;border-bottom:1px solid var(--line)}.answer-field{margin:25px 0}.answer-field label{display:block;font-size:18px;font-weight:bold;margin-bottom:8px}.answer-field textarea,.answer-field input:not([type=file]){width:100%;border:1px solid #7a949c;border-radius:8px;padding:14px;font:17px/1.6 "Trebuchet MS",sans-serif;color:var(--ink);background:white}.answer-field textarea{min-height:145px;resize:vertical}.answer-field small{display:block;font-size:14px;color:var(--muted);margin-top:8px}.answer-field input[type=file]{max-width:100%;font-size:16px}.honeypot{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.received{border:2px solid #287454;background:#e8f4eb}.teacher-tools{display:flex;flex-wrap:wrap;gap:12px;margin:20px 0}.submission{border:1px solid var(--line);border-radius:10px;padding:20px;margin:18px 0;background:white}.submission summary{font-size:17px;font-weight:bold}.submission dl{margin:20px 0}.submission dt{font-weight:bold;margin-top:20px}.submission dd{margin:8px 0;white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px}.session-box{max-width:600px;background:var(--soft);padding:24px;border-radius:12px}.muted{color:var(--muted)}@media(max-width:440px){.bridge-board{grid-template-columns:1fr 30px 1fr}.bank{padding:10px}.person{font-size:14px;padding:6px}.bridge-span{font-size:22px}.demo-head{flex-wrap:wrap;gap:10px}}