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p:last-child{margin-bottom:0}.flashcard-hint{text-align:center;color:var(--text-muted);margin-top:12px;font-size:11px;font-style:italic}.flashcard-actions{gap:10px;width:100%;margin-bottom:12px;display:flex}.flashcard-btn-study,.flashcard-btn-know{text-align:center;border-radius:10px;flex:1;padding:12px 18px;font-size:14px;font-weight:600;transition:all .15s}.flashcard-btn-study{color:#f59e0b;background:#f59e0b26;border:1px solid #f59e0b4d}.flashcard-btn-study:hover{background:#f59e0b40}.flashcard-btn-know{color:#10b981;background:#10b98126;border:1px solid #10b9814d}.flashcard-btn-know:hover{background:#10b98140}.flashcard-nav{justify-content:space-between;gap:10px;width:100%;display:flex}.flashcard-summary{text-align:center;padding:32px 20px}.flashcard-summary h2{color:var(--text-primary);margin-bottom:6px;font-size:22px;font-weight:800}.flashcard-summary-stats{justify-content:center;gap:40px;margin-bottom:28px;display:flex}.flashcard-stat{text-align:center}.flashcard-stat-num{margin-bottom:4px;font-size:36px;font-weight:800;line-height:1}.flashcard-stat-known .flashcard-stat-num{color:#10b981}.flashcard-stat-study .flashcard-stat-num{color:#f59e0b}.flashcard-stat-label{color:var(--text-muted);font-size:13px;font-weight:500}.flashcard-summary-actions{flex-direction:column;align-items:center;gap:10px;display:flex}.flashcard-summary-actions .content-btn{text-align:center;justify-content:center;min-width:240px}@media (width<=768px){.chat-page{height:calc(100vh - 128px)}.content-card{padding:18px}.content-card-header h1{font-size:17px}.problem-card{padding:18px}.quiz-meta{gap:20px}.quiz-meta-value{font-size:22px}.results-score{font-size:40px}.results-breakdown{gap:20px}.content-actions{flex-direction:column}.content-btn{justify-content:center}}@media (width<=640px){.content-card{border-radius:12px;padding:12px 14px}.content-card-header h1{font-size:16px}.problem-card{border-radius:12px;padding:14px}.problem-question{font-size:15px;line-height:1.5}.problem-choice{padding:10px 12px;font-size:14px}.problem-choices{gap:8px}.problem-explanation{padding:12px 14px;font-size:13.5px}.problem-explanation-label{font-size:10px}math-field.math-input{min-height:56px;padding:10px 12px;font-size:16px}.fr-textarea{min-height:100px;padding:10px 12px;font-size:15px}.fr-math-hint{font-size:11.5px}.fr-grade{padding:12px 14px}.fr-grade-feedback{font-size:13px}.results-card{padding:18px 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16px;display:flex}.app-topnav-logo{white-space:nowrap;align-items:center;gap:8px;display:flex}.app-topnav-logo img{object-fit:contain;width:30px;height:30px}.app-topnav-brand{color:var(--text-primary);letter-spacing:-.02em;font-size:17px;font-weight:900}.app-topnav-links{background:var(--bg-elevated);border-radius:10px;align-items:center;gap:4px;padding:3px;display:flex}.app-topnav-links a{color:var(--text-muted);border-radius:8px;padding:6px 14px;font-size:13px;font-weight:600;transition:all .15s}.app-topnav-links a:hover{color:var(--text-primary)}.app-topnav-links a.active{background:var(--bg-card);color:var(--text-primary);box-shadow:0 1px 3px #0000000f}.app-topnav-right{align-items:center;gap:8px;display:flex}.app-topnav-email{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;max-width:180px;font-size:13px;overflow:hidden}.app-topnav-signout{background:var(--bg-elevated);color:var(--text-secondary);border:1px solid var(--border);border-radius:8px;padding:6px 12px;font-size:12px;font-weight:600;transition:all .15s}.app-topnav-signout:hover{background:var(--bg-hover);color:var(--text-primary)}.app-main{max-width:1200px;min-height:calc(100vh - 56px);margin:0 auto;padding:20px 24px}.bottom-nav{display:none}@media (width<=768px){.app-topnav-links,.app-topnav-email{display:none}.app-main{padding:16px 16px 88px}.bottom-nav{z-index:100;background:var(--bg-card);border-top:1px solid var(--border);padding:6px 8px;padding-bottom:env(safe-area-inset-bottom,6px);display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -2px 10px #0000000a}.bottom-nav-item{color:var(--text-muted);-webkit-tap-highlight-color:transparent;flex-direction:column;flex:1;align-items:center;gap:3px;padding:6px 4px;font-size:10px;font-weight:600;transition:all .15s;display:flex}.bottom-nav-item.active{color:var(--primary)}.bottom-nav-icon{border-radius:10px;justify-content:center;align-items:center;width:36px;height:32px;transition:all 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