* { box-sizing: border-box; }
:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172033;
  background: #f4f7fb;
}
body { margin: 0; min-height: 100vh; }
button { font: inherit; -webkit-tap-highlight-color: transparent; }
.app { width: min(760px, 100%); margin: auto; padding: 16px; }
.topbar { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:14px; }
.eyebrow { font-size:.72rem; font-weight:800; letter-spacing:.12em; color:#667085; }
h1 { margin:2px 0 0; font-size:1.35rem; }
.ghost-btn { border:1px solid #d9dee8; background:#fff; border-radius:10px; padding:8px 12px; }
.stats-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:10px; margin-bottom:14px; }
.stat { background:#fff; border:1px solid #e5e9f0; border-radius:14px; padding:12px; }
.stat span { display:block; color:#667085; font-size:.75rem; }
.stat strong { display:block; margin-top:4px; font-size:1.25rem; }
.back-link { display:inline-block; margin-bottom:7px; color:#475467; font-size:.82rem; font-weight:700; text-decoration:none; }
.level-select, .dashboard-level { display:grid; gap:5px; color:#667085; font-size:.75rem; font-weight:700; }
.level-select select, .dashboard-level select { min-width:112px; border:1px solid #d9dee8; background:#fff; color:#172033; border-radius:10px; padding:9px 10px; font:inherit; }
.dashboard { width:min(980px,100%); }
.dashboard-topbar { align-items:flex-start; margin-bottom:20px; }
.dashboard-intro { margin:5px 0 0; color:#667085; font-size:.9rem; }
.practice-section, .level-guide { margin-top:24px; }
.section-heading { display:flex; justify-content:space-between; align-items:end; gap:16px; margin-bottom:12px; }
.section-heading h2, .level-guide h2 { margin:4px 0 0; font-size:1.15rem; }
.practice-grid { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; }
.practice-card { display:flex; align-items:center; gap:13px; min-height:118px; padding:16px; color:inherit; text-decoration:none; background:#fff; border:1px solid #e2e7ef; border-radius:16px; box-shadow:0 5px 20px rgba(20,30,50,.04); transition:transform .15s ease,border-color .15s ease; }
.practice-card:hover { transform:translateY(-2px); border-color:#aab5c5; }
.practice-icon { flex:0 0 46px; width:46px; height:46px; display:grid; place-items:center; border-radius:13px; background:#edf2ff; color:#3448a5; font-size:1.55rem; font-weight:800; }
.practice-card-content { display:grid; gap:4px; flex:1; }
.practice-card-content strong { font-size:1rem; }
.practice-card-content > span { color:#667085; font-size:.8rem; line-height:1.35; }
.practice-card-content .practice-levels { color:#3448a5; font-size:.72rem; font-weight:800; }
.practice-arrow { color:#667085; font-size:1.1rem; }
.level-guide { padding:17px; background:#fff; border:1px solid #e2e7ef; border-radius:16px; }
.level-list { display:grid; grid-template-columns:repeat(4,minmax(0,1fr)); gap:8px; margin-top:13px; }
.level-item { display:grid; gap:3px; padding:11px; background:#f7f8fa; border-radius:11px; }
.level-item strong { font-size:.83rem; }
.level-item span { color:#667085; font-size:.73rem; line-height:1.35; }
@media (min-width:600px) {
  .app { padding:28px; }
  .stats-grid { grid-template-columns:repeat(4,1fr); }
}
@media (max-width:560px) {
  .dashboard-topbar { align-items:flex-start; }
  .dashboard-topbar .ghost-btn { padding:7px 9px; font-size:.78rem; }
  .practice-grid { grid-template-columns:1fr; }
  .level-list { grid-template-columns:repeat(2,minmax(0,1fr)); }
}
@media (max-width:380px) {
  .section-heading { align-items:flex-start; flex-direction:column; }
}