:root{--bg: #111417;--panel: #181c21;--elev: #20252b;--line: #2b3239;--tx: #e7eaec;--tx2: #98a2ac;--tx3: #69737d;--live: #3fb8c8;--wait: #e0a33c;--danger: #e06b4f;--muted: #69737d;--radius: 9px;--radius-lg: 14px}*{box-sizing:border-box}html,body,#root{height:100%}.classroom-shell{height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden;background:var(--bg);user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}.classroom-shell input,.classroom-shell textarea,.classroom-shell [data-selectable]{user-select:text;-webkit-user-select:text}body{margin:0;background:var(--bg);color:var(--tx);font-family:IBM Plex Sans KR,Apple SD Gothic Neo,Malgun Gothic,sans-serif;-webkit-font-smoothing:antialiased;font-size:13px;line-height:1.5}a{color:var(--live)}button{font:inherit;color:inherit;background:none;border:none;padding:0;cursor:pointer;-webkit-appearance:none;white-space:nowrap}button:disabled{cursor:not-allowed}:focus-visible{outline:2px solid var(--live);outline-offset:2px}.mono{font-family:IBM Plex Mono,ui-monospace,monospace}.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.field{display:flex;flex-direction:column}.label{font-size:13px;color:var(--tx2);margin-bottom:7px}.input{height:48px;border-radius:var(--radius);border:1px solid var(--line);background:var(--elev);padding:0 14px;font-size:14px;color:var(--tx);width:100%}.input::placeholder{color:var(--tx3)}.input[aria-invalid=true]{border-color:var(--danger)}.error{margin:7px 0 0;font-size:12px;color:var(--danger);display:flex;align-items:flex-start;gap:5px}.button-primary{height:52px;border-radius:var(--radius);background:var(--live);color:#0e1114;font-size:15px;font-weight:600;width:100%}.button-primary:disabled{background:var(--muted);color:#0e1114}.pill{display:inline-flex;align-items:center;gap:4px;padding:2px 8px;border-radius:10px;font-size:12px;font-weight:600;white-space:nowrap}.pill-live{background:#3fb8c829;color:var(--live)}.pill-wait{background:#e0a33c29;color:var(--wait)}.pill-muted{background:#69737d2e;color:var(--tx2)}.pill-danger{background:#e06b4f2e;color:var(--danger)}