/* Chemistry Lab v1.1 — kid-first layer. Loaded last; overrides only. */

/* Solid bars: nothing shows through the sticky header or the phone nav. */
.header-shell{background:var(--bg);-webkit-backdrop-filter:none;backdrop-filter:none}
.mobile-nav{background:var(--surface)}
/* Lesson tabs scroll with the page so they never sit on top of the model. */
.lesson-tabs{position:static}

/* Comfortable tap targets for small links. */
.breadcrumbs a,.question-meta a,.word-card-actions a,.lesson-bottom .text-link,.book-link{display:inline-flex;align-items:center;min-height:44px}
.breadcrumbs{font-size:14px;align-items:center;gap:10px}
.breadcrumbs>span{display:inline-flex;align-items:center}

/* ---------- Home ---------- */
.ready-grid .card-art{position:absolute;right:22px;top:58px;width:44%;max-width:230px;color:var(--ink)}
.ready-grid .module-card h3{max-width:52%}
.ready-grid .card-copy{max-width:52%}
.art{display:block;width:100%;height:auto;overflow:visible;--art-card:#fff}
[data-theme=dark] .art{--art-card:var(--bg)}
.upcoming-heading{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin:34px 0 14px}
.upcoming-heading h3{font-size:22px;margin:0}
.upcoming-heading span{font-size:14px;color:var(--muted)}
.upcoming-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.upcoming-card{position:relative;display:flex;flex-direction:column;gap:6px;padding:18px 20px 20px;border:1px solid var(--line);border-radius:14px;background:var(--surface);text-decoration:none;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.upcoming-card:hover{border-color:var(--teal);box-shadow:var(--shadow)}
.upcoming-art{border-radius:10px;padding:12px 18px;margin-bottom:8px;color:var(--ink)}
.upcoming-art .art{max-height:150px;margin:0 auto}
.upcoming-card.blue .upcoming-art{background:var(--blue)}
.upcoming-card.coral .upcoming-art{background:var(--coral)}
.upcoming-card.sage .upcoming-art{background:var(--sage)}
.upcoming-card strong{font-size:18px}
.upcoming-card p{font-size:15px;color:var(--muted);margin:0}
.soon-tag{align-self:flex-start;font-size:13px;font-weight:700;color:var(--teal);background:var(--mint);border-radius:999px;padding:3px 10px}

/* One star system */
.star-goals{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:4px}
.star-goals li{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.star-goals li span[aria-hidden]{width:18px;text-align:center;color:var(--muted)}
.star-goals li.done{color:var(--ink);font-weight:700}
.star-goals li.done span[aria-hidden]{color:#c08a1e}
[data-theme=dark] .star-goals li.done span[aria-hidden]{color:#f1c565}
.achievement .star-goals{grid-template-columns:repeat(3,auto);justify-content:start;gap:6px 26px}
.practice-progress .star-goals{margin-top:12px}

/* ---------- Lesson ---------- */
.lesson-heading.compact{padding:14px 0 16px}
.lesson-heading.compact h1{font-size:36px;margin:6px 0 6px}
.lesson-tabs{margin-bottom:16px}
.mission.compact{padding:12px 18px;margin-bottom:14px;gap:14px}
.mission.compact strong{font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:var(--teal)}
.mission.compact p{font-size:16px;color:var(--ink)}
.guided-tour-details{margin-top:18px}
.check-heading h2{font-size:30px}

/* ---------- Practice ---------- */
.practice-heading h1{font-size:40px}
.question-pager .button.secondary{background:var(--surface)}

/* ---------- Word bank ---------- */
.lesson-tag{display:inline-flex;align-items:center;font-size:12.5px;font-weight:700;letter-spacing:.02em;color:var(--teal);background:var(--mint);border-radius:999px;padding:2px 9px;white-space:nowrap;vertical-align:1px}
.word-tools{display:grid;gap:14px;margin:6px 0 4px}
.word-tools .search{max-width:460px}
.word-filter{display:flex;flex-wrap:wrap;gap:8px}
.word-filter button{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:8px 15px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink);font-size:15px;cursor:pointer}
.word-filter button:hover{border-color:var(--teal)}
.word-filter button[aria-pressed=true]{background:var(--teal);border-color:var(--teal);color:var(--bg);font-weight:700}
.word-filter .topic-icon{width:18px;height:18px}
.word-group{margin:30px 0 8px}
.word-group-heading{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.word-group-heading h2{font-size:26px;margin:0;letter-spacing:-.01em}
.word-group-heading p{font-size:15px;color:var(--muted);margin:2px 0 0}
.word-group-icon{width:48px;height:48px;border-radius:14px;display:grid;place-items:center;background:var(--mint);color:var(--teal);flex-shrink:0}
.word-group-icon .topic-icon{width:26px;height:26px}
.word-group.atoms .word-group-icon{background:var(--blue);color:#2b5f93}
.word-group.identity .word-group-icon{background:var(--gold);color:#8a6716}
.word-group.joining .word-group-icon{background:var(--coral);color:#b2553a}
.word-group.change .word-group-icon{background:var(--coral);color:#b2553a}
.word-group.table .word-group-icon{background:var(--sage);color:#5d7340}
[data-theme=dark] .word-group .word-group-icon{color:var(--ink)}
.word-group-count{margin-left:auto;font-size:14px;color:var(--muted);white-space:nowrap}
.word-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.word-card h3{font-size:24px;margin:0;letter-spacing:-.01em;font-weight:400;font-family:Georgia,'Times New Roman',serif}
.word-card p{font-size:16px}

/* Planned lab page */
.planned-art{width:min(300px,80%);margin:18px 0 8px;padding:14px 18px;border-radius:16px;color:var(--ink)}
.planned-art.blue{background:var(--blue)}.planned-art.coral{background:var(--coral)}.planned-art.sage{background:var(--sage)}

/* ---------- Tablet ---------- */
@media(max-width:950px){
 .upcoming-grid{grid-template-columns:1fr 1fr}
 .ready-grid .card-art{width:120px}
}

/* ---------- Phone ---------- */
@media(max-width:680px){
 .ready-grid .card-art{position:static;width:min(240px,80%);margin:2px 0 8px}
 .hero-exhibit{height:318px}
 .hero-exhibit .exhibit-top{position:relative;z-index:2}
 .home-hero .atom-art{top:51%}
 .word-card{padding:18px 18px 12px}
 .word-card p{margin:8px 0 10px}
 .word-group-heading{position:sticky;top:var(--header-height);z-index:5;background:var(--bg);padding:8px 0;margin-bottom:8px}
 .ready-grid .module-card h3,.ready-grid .card-copy{max-width:none}
 .upcoming-grid{grid-template-columns:1fr}
 .upcoming-card{display:grid;grid-template-columns:116px 1fr;column-gap:14px;align-items:start}
 .upcoming-art{grid-row:1/4;margin:0;padding:8px}
 .upcoming-card .soon-tag{grid-column:2}
 .lesson-heading.compact{padding:6px 0 10px}
 .lesson-heading.compact h1{font-size:28px;max-width:none}
 .lesson-heading.compact p:not(.eyebrow){font-size:16px}
 .lesson-tabs{margin-bottom:10px}
 .mission.compact{padding:10px 14px;gap:4px 10px}
 .mission.compact .button{margin-left:0}
 .practice-heading h1{font-size:30px}
 .achievement .star-goals{grid-template-columns:1fr}
 .word-group-heading h2{font-size:22px}
 .word-group-count{display:none}
 .word-filter{flex-wrap:nowrap;overflow-x:auto;margin:0 -16px;padding:2px 16px 6px;scrollbar-width:none}
 .word-filter button{flex-shrink:0}
}

/* v1.1 fixes */
.question-meta{align-items:center}
.achievement>a,.achievement>p{display:inline-flex;align-items:center;min-height:44px;margin-top:8px}
/* The model always fits on screen below the header (phones held sideways, short laptops). */
.scene-stage{max-height:max(320px,calc(100dvh - var(--header-height) - 24px))}

/* v1.2 */
.concept-symbol.gold{background:var(--gold);color:#9a6b12;font-size:26px}
[data-theme=dark] .concept-symbol.gold{color:#f1c565}
.concept-symbol.blue span{font-size:14px}
.lesson-tags{display:inline-flex;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.ready-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.upcoming-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:680px){.ready-grid,.upcoming-grid{grid-template-columns:1fr}}
.shells-lab .scene-facts{font-weight:700}
@media(max-width:680px){.mobile-nav{grid-template-columns:repeat(5,1fr);padding-inline:4px}.mobile-nav a{font-size:12.5px}}
@media(max-width:680px){.scene-stage{max-height:max(320px,calc(100dvh - var(--header-height) - 100px))}}
[data-theme=dark] .concept-symbol.blue{color:#a9cff5}