:root{color-scheme:dark;--bg:#0a1226;--panel:#15213b;--text:#eff5ff;--muted:#a9bbd4;--cyan:#6be5dc;--line:#2a3a55}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 0 30%,#172950,transparent 65%),var(--bg);color:var(--text);font:16px/1.6 system-ui,sans-serif;min-height:100vh}header{max-width:1200px;margin:auto;padding:28px 36px;display:flex;align-items:center;justify-content:space-between;gap:18px}.brand{color:var(--text);text-decoration:none;font-weight:800;font-size:20px}.brand-icon{color:var(--cyan);padding-right:8px}.pill{font-size:12px;border:1px solid var(--line);padding:5px 12px;border-radius:30px;color:var(--muted)}main{max-width:1200px;margin:30px auto;padding:0 36px;display:grid;grid-template-columns:.9fr 1.1fr;gap:65px;align-items:start}.eyebrow{font-size:11px;letter-spacing:2px;color:var(--cyan);font-weight:800}h1{font-size:clamp(34px,4vw,53px);line-height:1.12;letter-spacing:-2px;margin:22px 0}h2{font-size:26px;line-height:1.3;margin:14px 0}h3{margin:0 0 10px;font-size:19px}p{color:var(--muted);margin:8px 0 20px}.card{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:28px}form{display:grid;gap:18px;margin-top:25px}label{font-size:14px;color:var(--muted);display:grid;gap:7px}input,select{width:100%;padding:13px 14px;border:1px solid #3a4d6c;border-radius:10px;font:inherit;color:var(--text);background:#0d182e;min-height:48px}input:focus,select:focus,button:focus-visible,a:focus-visible{outline:3px solid #6be5dc;outline-offset:3px}button{font:inherit;font-weight:700;border:0;border-radius:11px;background:var(--cyan);color:#102430;cursor:pointer;padding:12px 18px;min-height:44px}button span{float:right}button:disabled{opacity:.5;cursor:wait}.secondary{color:var(--text);background:#263956;border:1px solid #3a4d6c;font-size:13px;padding:9px 13px}.small{font-size:12px;margin:22px 0 0}.panel-title{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}.actions{display:flex;gap:9px;flex-wrap:wrap}.student-list{display:grid;gap:12px;margin-top:20px}.student-card{display:flex;align-items:center;flex-wrap:wrap;gap:16px;padding:20px;background:var(--panel);border-radius:17px;border:1px solid var(--line)}.student-card h3{margin:0}.student-card p{font-size:12px;margin:4px 0}.student-card .actions{margin-left:auto}.avatar{font-size:32px;background:#233652;border-radius:15px;padding:8px}.notice{margin-top:20px;border:1px dashed #3b5578;border-radius:16px;padding:20px}.notice p{font-size:13px;margin:8px 0 0}.empty{padding:24px;border:1px dashed var(--line);border-radius:14px;font-size:14px}.orbit{position:relative;height:220px;width:220px;border:1px solid #3c5279;border-radius:50%;display:grid;place-items:center;margin:45px auto}.robot{position:relative;color:var(--cyan);font-size:125px;line-height:1}.robot span{position:absolute;font-size:32px;color:#172039;left:37px;top:38px}.spark{position:absolute;right:-12px;top:75px;font-size:35px;color:#ffba68}#message{grid-column:1/-1;color:var(--cyan);min-height:26px}footer{max-width:1200px;margin:40px auto;padding:0 36px 30px;color:var(--muted);font-size:12px}[hidden]{display:none!important}@media(max-width:820px){main{grid-template-columns:1fr;gap:24px;margin-top:15px;padding:0 20px}.orbit{display:none}.intro p{max-width:560px}header{padding:20px;flex-wrap:wrap}.card{padding:23px}h1{font-size:38px}.student-card .actions{width:100%;margin-left:0}footer{padding:0 20px 25px}}
.tabs{display:flex;gap:10px;margin-bottom:28px}.tabs button{flex:1;font-size:14px}.intro-tags{display:flex;gap:10px;flex-wrap:wrap}.intro-tags span{font-size:11px;border:1px solid var(--line);padding:5px 10px;border-radius:20px}.subpanel{margin-top:20px}.code-display{font-family:monospace;font-size:22px;letter-spacing:3px;color:var(--cyan);overflow-wrap:anywhere}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}.stat{padding:16px 8px;background:#0d182e;border-radius:12px;text-align:center}.stat strong{display:block;font-size:26px;color:var(--cyan)}.stat span{font-size:11px;color:var(--muted)}.badges{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.badge{font-size:12px;border:1px solid #647346;border-radius:20px;padding:6px 12px;color:#e5efb7;background:#243426}.mission-map{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:25px 0}.mission-map span{background:#223651;border-radius:12px;padding:14px;text-align:center;font-size:13px}.game-toolbar{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}progress{width:100%;height:10px;accent-color:var(--cyan);margin:16px 0 24px}#mode-title{font-size:23px;margin:12px 0}#mode-description{font-size:14px}.equation{font-size:clamp(31px,5vw,48px);font-weight:800;text-align:center;letter-spacing:1px;background:#0d182e;border-radius:16px;padding:25px 10px;margin:20px 0}#answer-form{grid-template-columns:1fr auto;align-items:center;gap:12px}#numeric-answer{text-align:center;font-size:22px;width:100%;min-width:0}.puzzle-board{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:20px 0}.puzzle-row{background:#0d182e;border:1px solid var(--line);padding:14px;border-radius:10px;margin-bottom:10px;text-align:center;font-weight:800;font-size:22px}.puzzle-row.active{border:2px solid var(--cyan);color:var(--cyan)}.puzzle-options{display:grid;gap:10px}.puzzle-option{background:#274461;color:var(--text);border:1px solid #4e6b89;font-size:24px}.puzzle-option:hover{background:#335b7d}.hint{background:#303b2c;color:#e7e9bd;padding:15px;border-radius:12px;font-size:14px}.feedback{border:1px solid var(--cyan);background:#0d2a31;border-radius:16px;padding:22px;margin-top:20px}.feedback.retry{border-color:#ffba68;background:#342d25}.feedback p{color:var(--text)}.summary-icon{font-size:70px;text-align:center}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.table-scroll{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:12px;margin:18px 0}th,td{text-align:left;padding:10px 7px;border-bottom:1px solid var(--line);white-space:nowrap}th{color:var(--cyan);font-weight:700}.chart{width:100%;height:auto;max-height:210px;background:#0d182e;border-radius:12px}.chart text{font:11px system-ui;fill:#a9bbd4}.chart polyline{fill:none;stroke:#6be5dc;stroke-width:3}.chart line{stroke:#314563}.chart circle{fill:#6be5dc}.history-note{font-size:12px}.student-card .actions button{font-size:12px}#history-panel h4{margin:22px 0 8px}@media(prefers-reduced-motion:no-preference){.robot{animation:float 4s ease-in-out infinite}.feedback{animation:appear .25s ease-out}@keyframes float{50%{transform:translateY(-8px)}}@keyframes appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media(max-width:480px){.stats{gap:6px}.stat{padding:14px 4px}.stat strong{font-size:22px}#answer-form{grid-template-columns:1fr}#answer-form button{width:100%}.tabs button{font-size:12px;padding:10px 8px}.card{padding:20px}h1{font-size:36px}.puzzle-row{font-size:19px}.puzzle-option{font-size:22px}.panel-title{flex-wrap:wrap}.student-card{padding:16px}}

main > section,.card{min-width:0}.table-scroll{max-width:100%}@media(max-width:820px){.playing .intro{display:none}}