/* 2026-09-10 — flagship-target edge-device/accessibility pass. Puzzle and score semantics untouched. */
:root{--nlm-safe-l:max(12px,env(safe-area-inset-left,0px));--nlm-safe-r:max(12px,env(safe-area-inset-right,0px));--nlm-safe-t:max(8px,env(safe-area-inset-top,0px));--nlm-safe-b:max(8px,env(safe-area-inset-bottom,0px))}
html,body{min-height:100%;min-height:100dvh}body{overscroll-behavior:none}#stage{min-height:100dvh;padding-top:var(--nlm-safe-t);padding-right:max(30px,var(--nlm-safe-r));padding-bottom:var(--nlm-safe-b);padding-left:max(30px,var(--nlm-safe-l))}
.lab-header button,.lab-header #btn-fs,.auth-row button,.board-toolbar button{min-width:44px;min-height:44px}.auth-row button,.board-toolbar button{padding:8px 10px}.button{min-height:48px}
.field-wrap{scroll-padding:12px;-webkit-overflow-scrolling:touch}.modal{padding-top:max(24px,var(--nlm-safe-t));padding-right:max(20px,var(--nlm-safe-r));padding-bottom:max(24px,var(--nlm-safe-b));padding-left:max(20px,var(--nlm-safe-l))}.modal-panel{max-height:calc(100dvh - var(--nlm-safe-t) - var(--nlm-safe-b) - 28px);overflow:auto}
@media(max-width:900px){#stage{padding-right:max(20px,var(--nlm-safe-r));padding-left:max(20px,var(--nlm-safe-l))}}
@media(max-width:650px){#stage{padding-right:max(14px,var(--nlm-safe-r));padding-left:max(14px,var(--nlm-safe-l))}.lab-header{min-height:64px;height:auto;padding-block:6px}.lab-header button,.lab-header #btn-fs{min-width:44px;min-height:44px;padding:6px 8px}.menu-footer{padding-bottom:max(18px,var(--nlm-safe-b))}.action-bar button{min-height:48px}.board-toolbar button{min-height:44px}}
@media(max-width:390px){.lab-header{gap:7px}.home{font-size:16px}.home small{display:none}.lab-wordmark{font-size:7px}.lab-header nav{margin-left:auto}.lab-header button{font-size:8px;padding-inline:6px}.start-screen{padding-top:20px}.intro h1{font-size:clamp(46px,15vw,60px)}.menu-numbers{gap:24px}.board-toolbar{flex-wrap:wrap}.board-toolbar button{margin-left:auto}}
@media(max-height:560px) and (orientation:landscape){#stage{min-height:100dvh}.lab-header{min-height:52px;height:52px}.start-screen{padding-top:18px}.intro h1{font-size:clamp(38px,11vh,54px);margin:12px 0}.lede{margin:10px 0 14px}.menu-numbers,.optical-sketch{display:none}.lab-board{padding-top:14px}.modal{align-items:flex-start}.modal-panel{margin:auto;padding:22px}.control-guide{display:none}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.001ms!important;animation-duration:.001ms!important;animation-iteration-count:1!important}}