:root{--bg:#f4f6f8;--panel:#fff;--text:#172033;--muted:#667085;--line:#e4e7ec;--accent:#335cff;--danger:#c62828;--radius:18px;--shadow:0 4px 22px rgba(16,24,40,.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}.centered{min-height:100vh;display:grid;place-items:center}.login-card,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}.login-card{width:min(430px,92vw)}.brand{font-weight:800;font-size:22px;color:var(--accent)}h1,h2,h3{margin:0 0 14px}h2{font-size:20px;margin-top:24px}.topbar{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.93);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:12px max(16px,calc((100vw - 1050px)/2))}.topbar b{font-size:20px}.topbar small{display:block;color:var(--muted)}.top-actions,.row{display:flex;gap:10px;align-items:center}.container{max-width:1050px;margin:auto;padding:18px 16px 80px}.hero-grid,.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.hero .big{font-size:42px;font-weight:850;line-height:1}.eyebrow,.muted,small{color:var(--muted)}.stack{display:grid;gap:10px}.task,.note,.submission,.material,.integration{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px}.task-head{display:flex;justify-content:space-between;gap:12px}.subject{font-weight:750}.badge{display:inline-flex;padding:4px 8px;border-radius:999px;background:#eef2ff;color:#334dcc;font-size:12px}.skills{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:10px}.skill{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px}.bar{height:8px;background:#eaecf0;border-radius:10px;overflow:hidden;margin-top:10px}.bar>span{display:block;height:100%;background:var(--accent)}button{font:inherit;border:0;border-radius:11px;padding:10px 14px;cursor:pointer}.primary{background:var(--accent);color:white}.ghost{background:#eef1f5;color:var(--text)}.danger{background:var(--danger);color:white}.small{padding:7px 10px;font-size:13px}label{display:grid;gap:6px;font-size:13px;color:var(--muted)}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:10px;padding:10px 12px;background:white;color:var(--text);font:inherit}textarea{resize:vertical}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.form-grid .full{grid-column:1/-1}.error{color:var(--danger)}dialog{border:0;border-radius:18px;width:min(600px,94vw);padding:0;box-shadow:0 20px 70px rgba(0,0,0,.25)}dialog::backdrop{background:rgba(0,0,0,.35)}.dialog-card{padding:20px;display:grid;gap:14px}.tabs{display:flex;gap:7px;overflow:auto;padding-bottom:12px}.tabs button{white-space:nowrap;background:#e9edf3}.tabs button.active{background:var(--text);color:#fff}.tab-panel{display:none}.tab-panel.active{display:block}.code{white-space:pre-wrap;overflow:auto;background:#101828;color:#d0d5dd;padding:14px;border-radius:12px;font-size:12px;max-height:500px}.checkline{display:flex;gap:10px;align-items:flex-start}.checkline input{width:auto;margin-top:4px}.artifact-list{display:flex;flex-wrap:wrap;gap:6px}.artifact-list a{font-size:12px}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}@media(max-width:700px){.hero-grid,.split,.form-grid{grid-template-columns:1fr}.container{padding-top:12px}.topbar{padding:11px 14px}.tabs{margin:0 -16px;padding:0 16px 12px}.hero .big{font-size:34px}}
.rules-cheatsheet{margin-top:14px}.rules-cheatsheet summary{cursor:pointer;font-weight:750}.rules-cheatsheet.compact{margin-top:14px;padding:12px 0 0;border:0;box-shadow:none}.rules-body{padding-top:12px}.rules-body p{margin:10px 0;line-height:1.45}.xp-tiers{display:flex;gap:7px;flex-wrap:wrap}.xp-tier{display:inline-flex;padding:6px 9px;border-radius:999px;background:#f2f4f7;border:1px solid var(--line);font-size:12px}.xp-tier b{margin-right:3px}