:root{--bg:#f6f7fb;--card:#fff;--text:#182033;--muted:#667085;--primary:#4f46e5;--danger:#dc2626;--ok:#16a34a;--border:#e5e7eb}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit}.top{position:sticky;top:0;background:#fff;border-bottom:1px solid var(--border);z-index:5}.top-inner{max-width:980px;margin:auto;padding:12px 14px;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{font-weight:800;color:var(--primary);font-size:20px;text-decoration:none}.nav{display:flex;gap:8px;flex-wrap:wrap}.nav a,.btn{display:inline-flex;align-items:center;justify-content:center;border:0;border-radius:14px;padding:10px 13px;background:var(--primary);color:#fff;text-decoration:none;font-weight:700;font-size:14px;cursor:pointer}.btn.secondary,.nav a.secondary{background:#eef2ff;color:#3730a3}.btn.danger{background:var(--danger)}.btn.ok{background:var(--ok)}.wrap{max-width:980px;margin:auto;padding:16px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}.card{background:var(--card);border:1px solid var(--border);border-radius:22px;padding:16px;box-shadow:0 8px 22px rgba(16,24,40,.05)}h1{font-size:26px;margin:6px 0 16px}h2{font-size:20px;margin:4px 0 12px}.muted{color:var(--muted);font-size:14px}.form{display:grid;gap:12px}.input,select,textarea{width:100%;border:1px solid var(--border);border-radius:14px;padding:13px;background:#fff;color:var(--text);font-size:16px}textarea{min-height:90px}.flash{margin:0 0 14px;padding:12px 14px;border-radius:14px;background:#dcfce7;color:#166534}.flash.err{background:#fee2e2;color:#991b1b}.list{display:grid;gap:10px}.row{display:flex;align-items:center;justify-content:space-between;gap:10px;border:1px solid var(--border);border-radius:16px;padding:12px;background:#fff}.actions{display:flex;gap:8px;flex-wrap:wrap}.badge{display:inline-block;border-radius:999px;background:#eef2ff;color:#3730a3;padding:4px 9px;font-size:12px;font-weight:800}.progress{height:12px;background:#e5e7eb;border-radius:999px;overflow:hidden}.bar{height:100%;background:var(--primary);width:0}.study-card{min-height:300px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;font-size:25px;font-weight:800}.study-card img{max-width:100%;border-radius:18px;margin-top:14px;max-height:220px;object-fit:contain}.hidden{display:none}.tabs{display:flex;gap:8px;overflow:auto;padding-bottom:6px}.table{width:100%;border-collapse:collapse}.table th,.table td{border-bottom:1px solid var(--border);padding:10px;text-align:left;font-size:14px}.days{display:grid;grid-template-columns:repeat(30,1fr);gap:3px}.day{height:20px;border-radius:5px;background:#e5e7eb}.day.active{background:var(--primary)}@media(max-width:640px){.top-inner{align-items:flex-start;flex-direction:column}.nav a,.btn{width:auto;padding:10px 12px}.wrap{padding:12px}.card{border-radius:18px;padding:14px}.row{align-items:flex-start;flex-direction:column}.actions{width:100%}.actions .btn{flex:1}.study-card{font-size:22px;min-height:260px}}