.mastery-stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:18px 0}.mastery-stat{border:1px solid var(--line);border-radius:18px;background:#fff;padding:16px}.mastery-stat strong{display:block;font-size:30px;line-height:1.05;margin:5px 0}.mode-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.mode-tabs button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 13px;font:inherit;font-weight:900;cursor:pointer}.mode-tabs button[aria-selected="true"]{background:#2f2036;color:#fff;border-color:#2f2036}.study-shell{border:1px solid var(--line);border-radius:28px;background:#fff;padding:28px;box-shadow:0 12px 34px rgba(45,27,55,.07)}.study-card{border:1px solid var(--line);border-radius:24px;background:linear-gradient(145deg,#fff,#faf7fb);padding:28px;min-height:280px;display:flex;flex-direction:column;justify-content:center}.study-card h2{font-size:clamp(32px,5vw,50px);margin:7px 0}.study-card .themes{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.study-card .theme{border-radius:999px;background:#f1e7f7;color:#553261;padding:5px 9px;font-size:12px;font-weight:900}.study-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.study-actions button{min-width:110px}.grade-again{border-color:#b67c7c}.grade-hard{border-color:#b7975a}.grade-good{border-color:#6e946d}.answer-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:16px}.answer-button{border:1px solid var(--line);border-radius:15px;background:#fff;padding:14px;text-align:left;font:inherit;cursor:pointer}.answer-button:hover{background:#faf7fb}.answer-button.correct{border-color:#6e946d;background:#f3faf2}.answer-button.incorrect{border-color:#b67c7c;background:#fff4f4}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.topic-card{border:1px solid var(--line);border-radius:18px;padding:16px;background:#fff}.topic-card strong{font-size:25px;display:block;margin:4px 0}.evidence-bar{height:9px;border-radius:999px;background:#eee8f0;overflow:hidden;margin:9px 0}.evidence-fill{height:100%;background:currentColor;border-radius:999px}.weak-list{display:grid;gap:9px}.weak-row{display:flex;align-items:center;justify-content:space-between;gap:12px;border:1px solid var(--line);border-radius:15px;padding:12px 14px;background:#fff}.weak-row a{font-weight:900}.level-pill{display:inline-block;padding:5px 8px;border-radius:999px;background:#f4eef7;font-size:12px;font-weight:900}.transparent-formula{font-size:13px;color:var(--muted)}.session-progress{font-size:13px;color:var(--muted);margin-bottom:8px}.feedback{margin-top:14px}.feedback strong{display:block;margin-bottom:5px}@media(max-width:900px){.mastery-stats{grid-template-columns:repeat(2,1fr)}.topic-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:650px){.study-shell,.study-card{padding:20px}.topic-grid{grid-template-columns:1fr}.answer-grid{grid-template-columns:1fr}.weak-row{align-items:flex-start;flex-direction:column}.study-actions{display:grid;grid-template-columns:1fr}.study-actions button,.study-actions a{width:100%;box-sizing:border-box;text-align:center}.mode-tabs{display:grid;grid-template-columns:1fr 1fr}.mode-tabs button{width:100%}}