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#cad3cd;border-radius:13px;margin:18px 0 0;padding:25px}.board-panel .leaderboard{background:#fff}@media (max-width:520px){.app-shell{width:min(100% - 22px,1120px)}.login-shell{width:min(100% - 22px,1120px);padding:11px 0}.login-visual{border-radius:21px;padding:30px 24px}.login-visual h1{font-size:3rem}.login-facts{display:none}.login-card{padding:26px 22px}.student-chip{font-size:.65rem}.student-chip button{font-size:.6rem}.daily-pill{font-size:.68rem}.hero{border-radius:21px;padding:28px}.main-menu>button{padding:13px}.practice-panel,.rank-panel,.board-panel{padding:19px}.mode-grid,.progress-row{grid-template-columns:1fr}.student-entry-card{grid-template-columns:1fr;padding:20px}.student-entry-card form{grid-template-columns:1fr}.student-entry-card form button{padding:12px}.timer-options{grid-template-columns:1fr}.rank-mode small{max-width:190px}.tier-detail{display:grid}.rank-tabs{grid-template-columns:1fr}.history-panel{padding:18px}.history-panel summary{grid-template-columns:1fr auto}.history-panel time{grid-column:1/-1}.quiz-card,.summary-card{margin:24px auto;padding:22px}.quiz-card form{grid-template-columns:1fr}.quiz-card form button{padding:14px}.question{font-size:clamp(2.5rem,12vw,4rem)}.leaderboard>div{display:grid}.leaderboard li{grid-template-columns:36px 1fr 45px 54px;padding:9px 4px}.summary-actions{grid-template-columns:1fr}.secondary{padding:13px}}