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12px}.icon-button{width:40px;height:40px}.progress-track{width:74%}.activity-panel{grid-area:2/1;padding:14px 14px 10px}.activity-copy span{display:none}.activity-copy h1{margin-top:0;font-size:clamp(16px,4.6vw,20px)}.activity-stage{padding:8px 0}.fraction-stage{gap:12px;width:100%}.fraction-visual{width:min(245px,63vw)}.fraction-controls{gap:6px}.fraction-controls button{border-radius:11px;width:42px;height:42px}.activity-footer{flex-direction:column;align-items:stretch;gap:8px;padding-top:9px;display:flex}.feedback{text-align:center;min-height:17px;font-size:11px}.activity-buttons{width:100%}.activity-buttons button{flex:1;padding-inline:9px}.secondary-action{display:none}.primary-action{width:100%}.mobile-chat-trigger{z-index:4;border:0;border-top:1px solid var(--line);width:100%;padding:9px 16px calc(9px + env(safe-area-inset-bottom));text-align:left;color:var(--ink);cursor:pointer;background:#fff;grid-area:3/1;align-items:center;gap:12px;display:flex}.mobile-chat-trigger .kody-mark{width:42px;height:42px}.mobile-chat-trigger>span:nth-child(2){flex:1;min-width:0}.mobile-chat-trigger strong{font-size:12px;display:block}.mobile-chat-trigger small{color:var(--muted);margin-top:2px;font-size:10px;display:block}.mobile-chat-trigger b{color:#92909a;font-size:18px}.chat-backdrop{z-index:8;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#1f172a40;border:0;display:block;position:fixed;inset:0}.chat-panel{z-index:9;height:min(72dvh,620px);padding:15px 14px calc(14px + env(safe-area-inset-bottom));visibility:hidden;border:0;border-radius:24px 24px 0 0;transition:transform .25s,visibility .25s;position:fixed;inset:auto 0 0;transform:translateY(104%);box-shadow:0 -20px 60px #21162f29}.chat-panel.is-open{visibility:visible;transform:translateY(0)}.chat-heading{padding-bottom:12px}.mobile-close{color:#73707a;background:#f2f0f4;border:0;border-radius:50%;place-items:center;width:40px;height:40px;margin-left:auto;font-size:22px;display:grid}.message p{font-size:13px}.quick-actions button{min-height:36px;font-size:11px}.chat-input{min-height:50px}}@media (width<=380px),(height<=660px) and (width<=767px){.learning-shell{grid-template-rows:50px minmax(0,1fr) 64px}.activity-panel{padding-top:8px}.activity-copy h1{font-size:15px}.fraction-visual{width:min(205px,55vw)}.fraction-controls button{width:38px;height:38px}.activity-footer{padding-top:6px}.activity-buttons button{min-height:40px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}