/* Brief, directional transitions. No perpetual animation while reading. */
#lesson-dialog{overflow-x:hidden}
.reveal-waiting{opacity:0}
.nav-item,.mobile-nav button{transition:background .25s,color .25s,transform .2s}
.nav-item:hover{transform:translateX(3px)}
.nav-item .icon,.mobile-nav button .icon{transition:transform .3s cubic-bezier(.2,.8,.2,1)}
.nav-item.active .icon,.mobile-nav button.active .icon{transform:scale(1.08)}
.button .icon,.text-button .icon,.pack-arrow .icon,.atlas-enter .icon{transition:transform .25s}
.button:hover>.icon:last-child,.text-button:hover>.icon:last-child,.atlas-enter:hover>.icon:last-child{transform:translateX(3px)}
.button{transition:background .2s,transform .2s,box-shadow .2s}
.button:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 5px 14px #005a3b16}
.button:active:not(:disabled){transform:translateY(0) scale(.98)}
.answer{transition:background .2s,border-color .2s,transform .2s,box-shadow .2s}
.answer:hover:not(:disabled){transform:translateX(3px)}
.answer.selected{box-shadow:0 0 0 3px #28ad7420}
.mini-progress>span,.chapter-progress>span{transition:width .5s cubic-bezier(.2,.75,.25,1)}
.story-visual img{animation:none!important;transition:transform .65s ease-out}
.story-visual:hover img{transform:scale(1.025)}
.discovery-sparks{position:absolute;left:50%;top:50%;pointer-events:none}
.discovery-sparks i{position:absolute;width:6px;height:6px;background:#12af7c;border-radius:2px;opacity:0}
.discovery-sparks i:nth-child(2n){background:#99cfae;width:4px;height:9px}

/* A persistent horizon sits above the changing zoom level. */
.atlas-minimap{margin:1px 24px 18px;display:flex;position:relative;border-radius:5px;background:#f0f5f0;padding:6px;isolation:isolate}
.atlas-minimap::before{content:'';position:absolute;left:22px;right:22px;top:35px;height:1px;background:#c0d6c6;z-index:-1}
.atlas-minimap-window{position:absolute;left:0;top:0;bottom:0;background:#bedfcb42;border:1px solid #b2d1bc;border-radius:5px;z-index:-1;transition:width .25s,left .1s;pointer-events:none}
.atlas-minimap button{flex:1;min-width:0;display:flex;align-items:center;flex-direction:column;padding:4px 0;position:relative;gap:5px;color:#637e6c;min-height:44px}
.atlas-minimap button>span{font-size:9px;line-height:1.4}
.atlas-minimap button>i{width:6px;height:6px;background:#9ab3a1;border-radius:50%;display:block;transition:transform .25s,background .25s}
.atlas-minimap button[aria-current=true]{color:#006e4d;font-weight:700}
.atlas-minimap button[aria-current=true]>i{background:#009a6a;transform:scale(1.5);box-shadow:0 0 0 4px #00a57715}
.atlas-minimap button>small{position:absolute;top:100%;padding:7px 9px;background:#fafff9;border:1px solid #b8d4bf;border-radius:4px;font-size:10px;font-weight:500;white-space:nowrap;opacity:0;transform:translateY(-3px);transition:opacity .2s,transform .2s;pointer-events:none;z-index:10}
.atlas-minimap button:first-of-type>small{left:0}.atlas-minimap button:last-of-type>small{right:0}
.atlas-minimap button:hover>small,.atlas-minimap button:focus-visible>small{opacity:1;transform:none}
.atlas-canvas{overflow:hidden;isolation:isolate;outline-offset:-4px}
.atlas-atmosphere{position:absolute;inset:-18px;z-index:-2;pointer-events:none;opacity:0;background-size:cover;background-position:center;transition:transform .6s ease-out,opacity .4s;transform:scale(1.02)}
.atlas-atmosphere.illustrated{opacity:.12}
.atlas-atmosphere::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#063b2ef0,#0f3e31a6 65%,#0f3e3180)}
.era-rail,.milestone-rail{cursor:grab;scroll-snap-type:none;scrollbar-width:thin;scrollbar-color:#69a181 #254f40;user-select:none;-webkit-overflow-scrolling:touch}
.era-rail.is-dragging,.milestone-rail.is-dragging{cursor:grabbing;scroll-behavior:auto}
.is-dragging>*{pointer-events:none}
.era-stop{transition:color .25s,background .25s;border-radius:4px}
.era-stop:hover{background:#c9ffe908}
.era-stop strong{transition:transform .3s,color .3s}
.era-stop:hover strong{transform:translateY(-3px)}
.era-stop-dot{transition:transform .25s,background .25s,box-shadow .25s}
.era-stop:hover .era-stop-dot{transform:scale(1.25)}
.atlas-pan-controls{display:flex;justify-content:space-between;align-items:center;padding:10px 24px;border-bottom:1px solid var(--line);gap:10px;background:#fafffb}
.atlas-pan-controls>span{font-size:10px;color:var(--muted);display:flex;align-items:center;gap:7px}
.atlas-pan-controls>span .icon{width:14px;height:14px}
.atlas-pan-controls>div{display:flex;gap:7px}
.atlas-pan-controls button{border:1px solid #d1e3d5;border-radius:5px;height:34px;width:39px;display:grid;place-items:center;transition:background .2s}
.atlas-pan-controls button:hover{background:#e1f5e8}
.atlas-pan-controls button .icon{width:16px;height:16px}
.atlas-pan-controls button:first-child .icon{transform:rotate(180deg)}
.milestone-select{color:#d4e8d7;background:none;text-align:left;border-radius:4px;padding-bottom:12px;transition:background .25s}
.milestone-select>strong{display:block;font-size:20px;font-weight:500;line-height:1.3;max-width:240px;margin-bottom:14px;transition:color .2s,transform .2s}
.milestone-select:hover>strong{transform:translateY(-2px);color:#c4fbd5}
.milestone-select.selected>strong{color:#b7f2c7}
.milestone-select.selected .milestone-dot{box-shadow:0 0 0 5px #8df4b62a;background:#a6efbc}
.milestone-open{display:flex;align-items:center;gap:10px;font-size:10px;color:#b6cdbd;opacity:.7}
.milestone-open .icon{width:14px;height:14px}
.milestone-select.selected .milestone-open{color:#a6efbc;opacity:1}
.landmark-detail{margin-top:20px;display:grid;grid-template-columns:65px 1fr auto;align-items:start;gap:20px;border:1px solid #6694776b;border-radius:6px;background:#0a3026b8;padding:25px;min-height:205px}
.landmark-number{font:45px/1 var(--display);color:#8dbc9c}
.landmark-detail .eyebrow{color:#a4d4b6;font-size:9px;letter-spacing:1px;display:block;margin-bottom:10px}
.landmark-detail h3{font:28px/1.15 var(--display);color:#f1faef;margin-bottom:14px;letter-spacing:-.5px}
.landmark-detail p{color:#c7dacb;font-size:13px;line-height:1.85;max-width:660px}
.landmark-detail a{display:flex;align-items:center;gap:7px;color:#aeeec2;font-size:11px;margin-top:15px;width:max-content;max-width:100%}
.landmark-detail a:hover{text-decoration:underline}.landmark-detail a>.icon{width:14px;height:14px}
.landmark-arrows{display:flex;gap:3px}.landmark-arrows .icon-button{color:#b5d9c0;min-width:34px;min-height:34px}.landmark-arrows .icon-button:hover{background:#ffffff14}.landmark-arrows button:first-child .icon{transform:rotate(180deg)}.landmark-arrows button:disabled{opacity:.3}
.atlas-packs>button{transition:background .25s,border-color .25s,transform .25s}.atlas-packs>button:hover{transform:translateY(-3px)}
.atlas-lesson-list button{transition:background .25s,padding .25s}.atlas-lesson-list button:hover{padding-left:14px}

@media(max-width:700px){.atlas-minimap{margin:0 16px 16px;padding:4px}.atlas-minimap::before{top:32px;left:15px;right:15px}.atlas-minimap button>span{font-size:8px}.atlas-minimap button>small{display:none}.atlas-minimap button{min-height:42px}.atlas-pan-controls{padding:10px 16px}.atlas-pan-controls button{min-width:40px;min-height:36px}.landmark-detail{grid-template-columns:1fr;padding:20px;gap:0;position:relative}.landmark-number{display:none}.landmark-detail .eyebrow{font-size:8px;padding-right:60px;min-height:32px}.landmark-detail h3{font-size:27px;line-height:1.2}.landmark-detail p{font-size:13px}.landmark-arrows{position:absolute;right:10px;top:10px}.landmark-arrows .icon-button{width:31px;min-width:31px}.milestone-select>strong{font-size:21px}.atlas-context{margin-bottom:25px}.milestone-select{flex-basis:235px}.atlas-caption>span:last-child{display:none}.discovery-sparks i{width:4px;height:4px}}

html[data-motion=off] .reveal-waiting{opacity:1}
html[data-motion=off] .atlas-atmosphere{transform:none!important}
@media(prefers-reduced-motion:reduce){.reveal-waiting{opacity:1}.atlas-atmosphere{transform:none!important}}