:root{--sidebar:#172033;--accent:#2563eb;--bg:#f3f5f8;--text:#1f2937}body{background:var(--bg);color:var(--text)}.app-shell{display:flex;min-height:100vh}.sidebar{width:260px;background:var(--sidebar);color:#fff;position:fixed;top:0;bottom:0;left:0;padding:1rem}.brand{font-size:1.05rem;font-weight:700;margin-bottom:1rem}.sidebar nav a{display:flex;gap:.75rem;align-items:center;color:#dbeafe;text-decoration:none;padding:.75rem;border-radius:.75rem;margin-bottom:.25rem}.sidebar nav a:hover{background:rgba(255,255,255,.09);color:#fff}.main{margin-left:260px;width:calc(100% - 260px)}.topbar{height:64px;background:#fff;border-bottom:1px solid #e5e7eb;display:flex;justify-content:space-between;align-items:center;padding:0 1.5rem;position:sticky;top:0;z-index:10}.content{padding:1.5rem}.card{border:0;border-radius:1rem}.metric{background:#fff;border-radius:1rem;padding:1rem;box-shadow:0 .125rem .5rem rgba(0,0,0,.04)}.metric span{display:block;color:#6b7280;font-size:.875rem}.metric strong{font-size:1.75rem}.login-wrap{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#172033,#2563eb)}.login-card{width:min(420px,92vw)}.activity{border:1px solid #e5e7eb;border-radius:.75rem;padding:1rem;margin-bottom:.75rem;background:#fff}.activity.done{border-color:#86efac;background:#f0fdf4}.report-pre{white-space:pre-wrap;background:#f8fafc;padding:.75rem;border-radius:.5rem;margin-top:.5rem}@media(max-width:900px){.sidebar{position:relative;width:100%;bottom:auto}.app-shell{display:block}.main{margin-left:0;width:100%}.topbar{position:relative}.content{padding:1rem}}

.instruction-box{background:#f8fafc;border-left:4px solid #0d6efd;padding:.75rem;border-radius:.5rem;white-space:normal}.score-box{background:#fff7ed;border-left:4px solid #fd7e14;padding:.75rem;border-radius:.5rem}.activity{border:1px solid #e5e7eb;border-radius:1rem;padding:1rem;margin-bottom:1rem;background:#fbfdff}.activity.done{background:#f0fff4;border-color:#b7ebc6}.metric{background:white;border:1px solid #e5e7eb;border-radius:1rem;padding:1rem;box-shadow:0 .25rem .75rem rgba(0,0,0,.04)}.metric span{display:block;color:#6c757d;font-size:.85rem}.metric strong{font-size:1.4rem}.report-pre{white-space:pre-wrap;background:#f8f9fa;border-radius:.5rem;padding:.75rem}