:root{color-scheme:light;--bg:#f7f5ef;--panel:#fff;--panel-soft:#fbfaf6;--text:#1f2723;--muted:#67716c;--line:#dedbd0;--accent:#0d766e;--accent-strong:#0a5f58;--warn:#c44f2c;--gold:#d79521;--shadow:0 18px 40px rgba(31,39,35,.08)}*{box-sizing:border-box}body,html{margin:0;min-height:100%}body{background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.app-shell{margin:0 auto;max-width:780px;min-height:100vh;padding:18px}.topbar{justify-content:space-between;margin-bottom:20px}.nav-actions,.topbar{align-items:center;display:flex}.nav-actions{gap:8px}.brand{font-size:22px;font-weight:800}.button,.button-secondary,.nav-link{align-items:center;border-radius:8px;display:inline-flex;font-weight:750;min-height:42px;justify-content:center;padding:0 14px}.button-secondary,.nav-link{background:var(--panel);border:1px solid var(--line);color:var(--text);cursor:pointer}.button{background:var(--accent);border:1px solid var(--accent);color:#fff;cursor:pointer}.button:hover{background:var(--accent-strong)}.button:disabled{cursor:not-allowed;opacity:.5}.hero{margin-bottom:22px}.eyebrow{color:var(--accent);font-size:12px;font-weight:800;letter-spacing:0;margin:0 0 8px;text-transform:uppercase}h1,h2,h3,p{margin-top:0}h1{font-size:34px;line-height:1.05;margin-bottom:10px}h2{font-size:22px;margin-bottom:12px}h3{font-size:17px;margin-bottom:6px}.muted{color:var(--muted)}.grid{display:grid;grid-gap:14px;gap:14px}.stats-grid{display:grid;grid-gap:10px;gap:10px;grid-template-columns:repeat(3,1fr);margin:16px 0}.stat{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:12px}.stat strong{display:block;font-size:24px}.stat span{color:var(--muted);display:block;font-size:12px;margin-top:4px}.card{background:var(--panel);border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);padding:16px}.challenge-card{display:grid;grid-gap:12px;gap:12px}.card-row{align-items:center;display:flex;gap:12px;justify-content:space-between}.badge{background:#e8f3ef;border-radius:999px;color:var(--accent-strong);display:inline-flex;font-size:12px;font-weight:800;padding:6px 10px}.badge.warn{background:#fbebe5;color:var(--warn)}.leaderboard{display:grid;grid-gap:8px;gap:8px}.leaderboard-row{background:var(--panel);display:grid;grid-gap:10px;gap:10px;grid-template-columns:42px 1fr auto;min-height:64px;padding:10px 12px}.leaderboard-row,.rank{align-items:center;border:1px solid var(--line);border-radius:8px}.rank{background:var(--panel-soft);display:inline-flex;font-weight:850;height:36px;justify-content:center;width:36px}.rank.first{background:#fff3d8;border-color:#f0cb77;color:#8a5a00}.streak{font-weight:850;text-align:right}.form{display:grid;grid-gap:14px;gap:14px}.field{display:grid;grid-gap:7px;gap:7px}.field label{font-size:13px;font-weight:800}.copy-field,.field input,.field textarea{background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--text);min-height:44px;padding:10px 12px;width:100%}.field textarea{min-height:116px;resize:vertical}.copy-field{margin-top:12px}.progress{background:#e9e5d9;border-radius:999px;height:10px;overflow:hidden}.progress span{background:var(--accent);display:block;height:100%}.section{margin-top:22px}.auth-grid{display:grid;grid-gap:14px;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr))}.notice{background:#e8f3ef;border:1px solid #b6d9cf;border-radius:8px;color:var(--accent-strong);font-weight:700;padding:12px 14px}@media (max-width:560px){.app-shell{padding:14px}h1{font-size:30px}.auth-grid,.stats-grid{grid-template-columns:1fr}.card-row{align-items:flex-start;flex-direction:column}}