:root{--ink: #1c1a17;--paper: #faf8f4;--card: #ffffff;--gold: #b8923d;--gold-soft: #f3ead6;--navy: #23324a;--line: #e6e0d4;--muted: #7a7365;--hl: #fdf3c8;--green: #2e7d4f}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{font-family:Noto Sans KR,sans-serif;background:var(--paper);color:var(--ink);line-height:1.7}button{font-family:inherit;cursor:pointer}input,select,textarea{font-family:inherit;font-size:15px}.loading{padding:80px 20px;text-align:center;color:var(--muted)}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:10px;background:none;border:none;text-align:left}.brand-badge{width:40px;height:40px;border-radius:10px;background:var(--navy);color:var(--gold);font-family:"Noto Serif 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var(--gold);background:#fdf9ef;position:relative;padding:18px 18px 16px}.lec2 .act-label{font-size:13px}.lec2 .complete-btn{border:none;background:linear-gradient(135deg,#ceac60,#a8822f);color:#1d2638;font-weight:700;font-size:15.5px;box-shadow:0 8px 22px #a8822f4d}.lec2 .complete-btn.on{background:#eaf6ee;color:var(--green);border:2px solid var(--green);box-shadow:none}.lec2-nav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.lec2-nav-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;text-align:left;transition:transform .15s,box-shadow .15s}.lec2-nav-card:hover{transform:translateY(-2px);box-shadow:0 6px 16px #23324a1a}.lec2-nav-card small{display:block;font-size:11.5px;color:var(--gold);font-weight:700;margin-bottom:4px}.lec2-nav-card span{font-size:13.5px;line-height:1.45;color:var(--ink)}.lec2-nav-card.next{text-align:right;background:var(--navy);border-color:var(--navy)}.lec2-nav-card.next small{color:#cdb87f}.lec2-nav-card.next span{color:#f2edde}.lec2-nav-empty{visibility:hidden}@media (max-width: 560px){.lec2-hero h2{max-width:100%}.lec2-hero-ship{right:8px;bottom:30px;opacity:.5}.lec2-nav{grid-template-columns:1fr}.lec2-nav-card.next{text-align:left}.lec2-progress{top:57px}}.remove-btn{background:none;border:1px solid #d8b3b3;color:#a55;border-radius:8px;padding:5px 11px;font-size:12px}.remove-btn:hover{background:#fbeeee}.admin-msg.top{background:#eef6f0;border:1px solid #cfe5d6;border-radius:10px;padding:10px 14px;margin-top:14px}.blocked-screen{min-height:80vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px}.blocked-screen h2{font-family:"Noto Serif KR",serif;font-size:21px;margin:10px 0 8px}.blocked-screen p{color:var(--muted);line-height:1.8;margin-bottom:20px}.code-list{display:flex;flex-direction:column;gap:8px}.code-item{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:9px 13px}.code-value{font-family:Consolas,monospace;font-size:15px;font-weight:700;letter-spacing:2px;color:var(--navy);background:var(--gold-soft);border-radius:7px;padding:4px 11px}.code-role{font-size:12px;color:var(--muted)}.code-role.teacher{color:#2f6fa8}.code-role.admin{color:#a8632f}.ghost-btn.sm{padding:5px 11px;font-size:12px}