:root{--accent-primary: #2dd4bf;--accent-secondary: #38bdf8;--board-glow: #5eead4;--bg-deep: #061225;--bg-panel: rgba(7, 22, 45, .85);--text-main: #eef5ff;--text-muted: #bdd0f4;color-scheme:dark;font-family:IBM Plex Sans,Segoe UI,sans-serif;background:var(--bg-deep);color:var(--text-main)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(circle at 10% 10%,rgba(45,212,191,.22),transparent 40%),radial-gradient(circle at 80% 0%,rgba(56,189,248,.2),transparent 35%),var(--bg-deep)}button,textarea,input,select{font:inherit}.page-shell{max-width:1280px;margin:0 auto;padding:28px;display:grid;gap:20px}.panel{background:var(--bg-panel);border:1px solid rgba(142,197,255,.2);border-radius:18px;padding:20px;box-shadow:0 16px 42px 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8px}.challenge-status-pill.active{background:#2dd4bf33;color:#9affea}.challenge-status-pill.locked{background:#94a3b833;color:#d9e2f5}.challenge-status-pill.complete{background:#34d39933;color:#b6ffdd}button{border:none;border-radius:999px;background:linear-gradient(90deg,var(--accent-primary),var(--accent-secondary));color:#041429;font-weight:700;padding:11px 16px;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.button-secondary{background:linear-gradient(90deg,#334155,#475569);color:var(--text-main)}.organizer-actions-row,.admin-actions{display:grid;gap:10px}.leaderboard-list,.leaderboard-preview-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}.leaderboard-row,.leaderboard-preview-row{display:grid;grid-template-columns:44px 1fr auto;gap:10px;align-items:center;padding:8px 0;border-bottom:1px solid rgba(142,197,255,.14)}.leaderboard-row 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