:root{
  --blue:#1e78d7;--deep:#0c3e87;--sky:#dff4ff;--green:#72ad24;--orange:#ff9e12;
  --purple:#7d4cbb;--cream:#fff9e9;--ink:#18314f;--muted:#63768a;--panel:#fff;
  --shadow:0 14px 38px rgba(28,72,120,.16);--radius:24px;
}
*{box-sizing:border-box}
body{margin:0;font-family:Nunito,Arial,sans-serif;color:var(--ink);background:linear-gradient(#83cef8 0,#e5f7ff 48%,#f7fbff 100%);min-height:100vh}
button,input{font:inherit}
button{cursor:pointer}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:12px clamp(16px,4vw,48px);background:rgba(255,255,255,.9);backdrop-filter:blur(12px);border-bottom:1px solid #cfe8f7}
.brand{border:0;background:none;color:var(--deep);font-size:1.35rem;font-weight:900;display:flex;gap:8px;align-items:center}
.brand-star{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--orange);color:white}
.top-stats{display:flex;gap:10px;align-items:center}.xp-pill{display:flex;gap:8px;background:#eaf6ff;border:2px solid #a9daf8;padding:8px 14px;border-radius:999px}.xp-pill span{font-weight:900;color:var(--orange)}
.icon-button{border:0;background:white;border-radius:13px;box-shadow:0 3px 12px #bdd4e5;padding:9px 12px}
#screen{max-width:1220px;margin:auto;padding:28px clamp(14px,3vw,36px) 60px}
.panel{background:rgba(255,255,255,.96);border:1px solid rgba(255,255,255,.8);border-radius:var(--radius);box-shadow:var(--shadow)}
.onboarding{display:grid;grid-template-columns:minmax(260px,.8fr) minmax(320px,1.2fr);gap:28px;align-items:center;min-height:75vh}
.onboarding-art{position:relative;text-align:center;background:url('../images/backgrounds/snow-village.jpg') center/cover;border-radius:32px;min-height:570px;display:flex;align-items:flex-end;justify-content:center;overflow:hidden;box-shadow:var(--shadow)}
.onboarding-art:after{content:"";position:absolute;inset:45% 0 0;background:linear-gradient(transparent,rgba(11,65,116,.38))}
.onboarding-art img{position:relative;z-index:2;width:min(82%,390px);filter:drop-shadow(0 18px 18px rgba(0,0,0,.25))}
.onboarding-panel{padding:clamp(24px,4vw,42px)}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;color:var(--blue);font-weight:900;font-size:.78rem}
h1,h2,h3{line-height:1.08;margin:.45em 0}h1{font-size:clamp(2rem,5vw,3.5rem)}p{line-height:1.6;color:var(--muted)}
label{display:block;font-weight:800;margin:15px 0}
input[type=text],input[type=number],input:not([type]){width:100%;padding:14px;border:2px solid #d7e6ef;border-radius:13px;margin-top:7px}
fieldset{border:0;padding:0;margin:22px 0}legend{font-weight:900;margin-bottom:10px}
.avatar-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.avatar-grid input,.chip-grid input{position:absolute;opacity:0}
.avatar-grid span{display:flex;flex-direction:column;align-items:center;padding:9px;border:3px solid transparent;border-radius:18px;background:#f1f8fc}
.avatar-grid img{height:95px;max-width:100%;object-fit:contain}
.avatar-grid input:checked+span{border-color:var(--blue);background:#e2f2ff}
.chip-grid{display:flex;flex-wrap:wrap;gap:8px}.chip-grid label{margin:0}.chip-grid span{display:block;padding:9px 13px;background:#eff5f7;border:2px solid transparent;border-radius:999px}
.chip-grid input:checked+span{background:#e7f7d5;border-color:var(--green)}
.primary,.secondary{border:0;border-radius:14px;padding:12px 18px;font-weight:900;color:#fff;box-shadow:0 5px 0 rgba(0,0,0,.15);transition:.15s}
.primary{background:linear-gradient(#2b94ed,#176ec4)}.secondary{background:linear-gradient(#89c63d,#66a31f)}.large{font-size:1.08rem;padding:15px 22px;width:100%}
.primary:hover,.secondary:hover{transform:translateY(-2px)}
.hero{display:grid;grid-template-columns:1.5fr .7fr;gap:24px;align-items:center;padding:32px;background:linear-gradient(135deg,#fff 0,#e8f7ff 65%);overflow:hidden}
.hero img{width:230px;justify-self:center;filter:drop-shadow(0 14px 12px #82afc9)}
.progress-shell{height:18px;background:#d8e7ef;border-radius:999px;overflow:hidden;border:2px solid white;box-shadow:inset 0 2px 4px #abc}
.progress-fill{height:100%;background:linear-gradient(90deg,#24a5ed,#76ca4b);border-radius:999px}
.world-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:24px}
.world-card{position:relative;min-height:290px;border:0;border-radius:22px;overflow:hidden;background-size:cover;background-position:center;box-shadow:var(--shadow);text-align:left;color:#fff;padding:18px;display:flex;flex-direction:column;justify-content:flex-end}
.world-card:before{content:"";position:absolute;inset:0;background:linear-gradient(transparent 35%,rgba(5,33,69,.84))}
.world-card>*{position:relative}.world-card.locked{filter:grayscale(.8);opacity:.62}.world-card h3{font-size:1.4rem}.world-card small{opacity:.9}
.mission-panel{display:grid;grid-template-columns:.65fr 1.35fr;gap:22px;padding:28px}
.scene{border-radius:22px;min-height:480px;background-size:cover;background-position:center;display:flex;align-items:flex-end;justify-content:center;overflow:hidden;position:relative}
.scene:after{content:"";position:absolute;inset:55% 0 0;background:linear-gradient(transparent,rgba(0,0,0,.3))}
.scene img{position:relative;z-index:2;width:min(80%,270px);filter:drop-shadow(0 14px 12px rgba(0,0,0,.35))}
.dialogue{padding:18px 24px;background:#fff8dd;border:3px solid #d8ad60;border-radius:18px;margin-bottom:20px}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:12px}.answer{padding:16px;border:2px solid #c9deea;border-radius:15px;background:#f6fbfe;font-weight:900;text-align:left}.answer:hover{border-color:var(--blue);background:#e6f5ff}.answer.good{background:#e6f8d5;border-color:var(--green)}.answer.try{background:#fff3cf;border-color:var(--orange)}
.reward{display:grid;place-items:center;text-align:center;padding:60px 20px}.reward img{width:160px;animation:bounce 1.2s infinite}.reward h1{color:var(--deep)}
.dashboard-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.metric{padding:24px}.metric strong{font-size:2rem;color:var(--blue);display:block}.skills{grid-column:span 2}.skill-row{margin:16px 0}.skill-row header{display:flex;justify-content:space-between}
.badge-strip{display:flex;flex-wrap:wrap;gap:14px}.badge{width:92px;text-align:center}.badge img{width:72px;height:72px;object-fit:contain}
.toast{position:fixed;right:24px;bottom:24px;background:#163b66;color:#fff;padding:13px 18px;border-radius:14px;transform:translateY(120px);transition:.25s;box-shadow:var(--shadow);z-index:50}.toast.show{transform:translateY(0)}
.settings{max-width:680px;margin:auto;padding:32px}.danger{background:#d94c3d;color:white;border:0;padding:12px 18px;border-radius:12px;font-weight:900}
@keyframes bounce{50%{transform:translateY(-12px)}}
@media(max-width:900px){.onboarding,.hero,.mission-panel{grid-template-columns:1fr}.onboarding-art{min-height:360px}.world-grid{grid-template-columns:repeat(2,1fr)}.dashboard-grid{grid-template-columns:1fr}.skills{grid-column:auto}}
@media(max-width:560px){.avatar-grid{grid-template-columns:repeat(2,1fr)}.world-grid{grid-template-columns:1fr}.answers{grid-template-columns:1fr}.topbar{padding:9px 12px}.brand{font-size:1.05rem}}

/* Consolidated sprite-sheet renderer */
.atlas-sprite{position:relative;display:inline-block;overflow:hidden;aspect-ratio:var(--ratio);isolation:isolate;vertical-align:middle}
.atlas-sprite>img{position:absolute;max-width:none;height:auto;user-select:none;pointer-events:none}
.character-sprite{width:220px;filter:drop-shadow(0 14px 12px rgba(22,58,87,.24))}
.hero-character{width:min(100%,250px);justify-self:center}
.onboarding-character{position:relative;z-index:2;width:min(82%,390px);filter:drop-shadow(0 18px 18px rgba(0,0,0,.25))}
.avatar-sprite{width:82px;filter:none}
.mission-character{width:min(82%,280px);position:relative;z-index:2}
.hint-row{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#f3ebff;border:2px solid #b996e4;border-radius:16px}
.hint-row p{margin:0;color:var(--ink)}
.hint-character{width:72px;flex:0 0 auto;filter:none}
.object-sprite{width:92px;filter:drop-shadow(0 8px 8px rgba(0,0,0,.18))}
.reward-crystal{width:170px;animation:bounce 1.2s infinite}
.reward-character{width:180px;margin:6px 0 18px}
.logo-sprite{width:190px}
.badge .object-sprite{width:76px;display:block;margin:auto}.badge small{display:block;margin-top:5px;text-transform:capitalize}
.avatar-grid span{gap:5px}.avatar-grid img{height:auto;max-width:none;object-fit:initial}
.onboarding-art{background-image:url('../images/worlds/world5.png')}
.hero img,.scene img,.reward img,.badge img{width:auto}
.world-card{background-position:center;transition:transform .18s ease,filter .18s ease}
.world-card:hover:not(.locked){transform:translateY(-4px)}
.world-card small{display:inline-flex;align-self:flex-start;padding:5px 9px;border-radius:999px;background:rgba(7,37,68,.7)}
@media(max-width:560px){.character-sprite{width:175px}.avatar-sprite{width:72px}.reward-character{width:150px}}

/* Persistent adventure / authentication screens */
.welcome-screen{display:grid;grid-template-columns:minmax(0,1fr) minmax(280px,.9fr);gap:28px;align-items:center;max-width:1180px;margin:48px auto;padding:0 22px}.welcome-copy{padding:42px}.welcome-copy h1{font-size:clamp(2.2rem,5vw,4.5rem);line-height:1.02}.welcome-actions{display:flex;gap:14px;flex-wrap:wrap;margin:28px 0 14px}.welcome-team{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;align-items:end}.welcome-character{width:100%;max-width:230px}.privacy-note{font-size:.92rem;opacity:.75}.auth-shell{max-width:880px;margin:50px auto;display:grid;grid-template-columns:minmax(0,1fr) 260px;align-items:end;gap:24px;padding:0 22px}.auth-card{padding:38px}.auth-card form,.onboarding-panel form,.settings form{display:grid;gap:18px}.auth-character{width:260px}.text-button{border:0;background:none;color:inherit;font-weight:800;padding:0;margin-bottom:16px;cursor:pointer;text-align:left}.form-error{background:#ffe0e0;color:#821c1c;border:2px solid #e98b8b;border-radius:14px;padding:12px 14px;font-weight:700}.code-card{max-width:720px;margin:55px auto;text-align:center;padding:42px 34px}.code-character{width:210px;margin:0 auto}.adventure-code{font-size:clamp(1.8rem,6vw,3.5rem);font-weight:900;letter-spacing:.09em;background:#fff7d6;border:3px dashed #b27900;border-radius:18px;padding:20px;margin:22px 0;overflow-wrap:anywhere;color:#4a3100}.code-reminder{font-weight:800;margin-bottom:24px}.settings-code{display:inline-flex;flex-direction:column;background:#fff7d6;color:#4a3100;border:2px solid #d9ad45;border-radius:16px;padding:14px 20px;margin:12px 0}.settings-code strong{font-size:1.45rem;letter-spacing:.06em}.settings hr{border:0;border-top:1px solid rgba(0,0,0,.18);margin:28px 0}.primary:disabled,.secondary:disabled,.danger:disabled{opacity:.55;cursor:wait}
@media(max-width:760px){.welcome-screen,.auth-shell{grid-template-columns:1fr;margin-top:22px}.welcome-team{order:-1;grid-template-columns:repeat(4,1fr)}.welcome-character{max-width:130px}.auth-character{display:none}.welcome-copy,.auth-card{padding:26px}.welcome-actions>*{width:100%}}