:root{--ink:#123e44;--teal:#006c62;--yellow:#ffe072;--paper:#f5fcfc;--line:#c3dddd;--blue:#ddf4ff}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'PingFang SC','Microsoft YaHei',system-ui,sans-serif;font-size:18px}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer}button,a{touch-action:manipulation}button:focus-visible,a:focus-visible,summary:focus-visible{outline:4px solid #aa4600;outline-offset:5px}button{border:0}a{color:var(--teal);text-underline-offset:5px}button:disabled{opacity:.42;cursor:default}.top{max-width:1440px;margin:auto;padding:24px 42px;display:flex;justify-content:space-between;gap:22px;align-items:center}.brand{text-decoration:none;display:flex;align-items:center;gap:12px;font-size:23px;font-weight:900;letter-spacing:1px}.brand-mark{display:grid;place-items:center;width:48px;height:48px;border-radius:18px;background:var(--teal);color:white;font-size:32px;transform:rotate(-5deg)}.brand small{display:block;font-size:13px;font-weight:600;letter-spacing:2px;margin-top:3px}.tools{display:flex;align-items:center;gap:12px;font-size:14px;font-weight:700}.tools button,.tools a{padding:12px;background:white;border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--ink);min-height:44px}.tools button[aria-pressed=true]{background:var(--ink);color:white}main{max-width:1360px;margin:0 auto;padding:12px 42px}.lesson-top{display:flex;justify-content:space-between;gap:16px;margin:6px 0 24px;font-size:15px}.eyebrow{font-weight:800;letter-spacing:2px}.duration{color:#48696d}#journey{display:flex;gap:8px;margin-bottom:24px;align-items:center}#journey button{flex:1;padding:13px 6px;border-radius:14px;background:transparent;color:#48696d;font-size:15px;border:1px solid var(--line);min-height:48px}#journey button[aria-current=step]{background:var(--teal);border-color:var(--teal);color:white;font-weight:800}#journey .number{margin-right:6px;font-variant-numeric:tabular-nums;opacity:.75}#stage{background:white;border:1px solid var(--line);border-radius:32px;min-height:480px;overflow:hidden;display:grid;grid-template-columns:.9fr 1.1fr;box-shadow:0 14px 50px #123e4408}.story{padding:42px;display:flex;flex-direction:column;align-items:flex-start}.role{display:inline-block;background:#ddf4eb;color:#095d45;font-size:14px;padding:8px 13px;border-radius:99px;font-weight:800;margin-bottom:28px}.role.builder{background:#fff0b5;color:#664e00}.role.actor{background:#e4edff;color:#254985}.chapter-name{font-size:15px;font-weight:700;color:#4a6c70;margin:0 0 12px}h1{font-size:clamp(34px,3.7vw,56px);line-height:1.2;letter-spacing:-1px;margin:0 0 22px;white-space:pre-line}.story-text{font-size:clamp(20px,2vw,27px);line-height:1.7;white-space:pre-line;margin:0 0 26px}.mascot-mood{margin-top:auto;display:flex;gap:10px;align-items:center;font-size:15px;font-weight:700}.mood-icon{background:#ffe072;width:42px;height:42px;display:grid;place-items:center;border-radius:50%;font-size:25px}.activity{background:var(--blue);padding:32px;display:flex;flex-direction:column;justify-content:center;text-align:center;position:relative}.activity.activity-intro{padding:0;background:#95d9ed}.hero-art{width:100%;height:100%;object-fit:cover;min-height:480px}.art-label{position:absolute;bottom:18px;left:20px;border-radius:99px;background:#fffef1e8;font-size:14px;padding:9px 15px}.prompt{font-size:18px;font-weight:700;margin:0 0 22px}.choices{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.choice{background:white;border:3px solid transparent;border-radius:24px;padding:24px 15px 20px;flex:1;min-width:110px;color:var(--ink);font-size:20px;font-weight:700;transition:transform .16s,border-color .16s;line-height:1.55}.choice:hover{transform:translateY(-4px);border-color:#69aaa7}.choice[aria-pressed=true]{border-color:var(--teal);background:#edfff7}.choice .icon{font-size:clamp(60px,6vw,92px);display:block;margin-bottom:20px;line-height:1.2}.choice.action{flex:initial;min-width:240px;max-width:100%;align-self:center;padding:25px 35px}.choice.action .icon{font-size:110px}.feedback{font-size:21px;line-height:1.65;font-weight:700;margin:22px 0 0;min-height:70px}.feedback:empty{display:none}.safety{font-size:14px;line-height:1.6;margin:20px 0 0;color:#355b63}.activity-finish .choices{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.activity-finish .choice{font-size:16px;padding:12px 8px;min-width:0}.activity-finish .icon{font-size:42px;margin-bottom:9px}.bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:23px 0 18px}.primary,.secondary{border-radius:16px;min-height:58px;padding:15px 28px;font-size:18px;font-weight:800}.primary{background:var(--teal);color:white}.secondary{background:white;border:1px solid var(--line);color:var(--ink)}#page-label{font-size:15px;color:#48696d}.guide{border-top:1px solid var(--line);font-size:15px;line-height:1.8;padding:15px 0}.guide summary{cursor:pointer;font-weight:700;min-height:32px}.guide p{max-width:900px}.guide .prompt-read{font-weight:800;color:var(--teal)}footer{padding:18px 24px 26px;text-align:center;font-size:13px;color:#506f73}.skip{position:fixed;left:20px;top:-100px;z-index:100;background:white;padding:14px}.skip:focus{top:10px}.reduced *{animation:none!important;transition:none!important;scroll-behavior:auto!important}.projector main{max-width:1600px}.projector h1{font-size:clamp(40px,4.3vw,70px)}.projector .story-text{font-size:clamp(24px,2.4vw,36px)}.projector .choice,.projector .feedback{font-size:24px}.projector .guide,.projector footer{display:none}.teacher{max-width:1000px}.teacher h1{font-size:42px;white-space:normal}.teacher h2{font-size:26px;margin-top:38px}.teacher p,.teacher li{line-height:1.9}.teacher .intro-box{background:var(--blue);padding:24px 30px;border-radius:24px}.teacher table{width:100%;border-collapse:collapse;line-height:1.7;font-size:16px}.teacher th,.teacher td{padding:14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.teacher th{background:#e7f4f1}.teacher .notice{border-left:5px solid var(--teal);padding-left:20px}.teacher .source-list li{margin-bottom:13px}.teacher .source-list a{overflow-wrap:anywhere}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(max-width:900px){.top{padding:20px 24px;align-items:flex-start}.tools{gap:7px;flex-wrap:wrap;justify-content:flex-end}.tools button,.tools a{padding:10px}main{padding:8px 24px}.story{padding:28px}.activity{padding:25px}#stage{grid-template-columns:1fr 1fr}.choice{font-size:18px;padding:18px 10px}.hero-art{min-height:460px}#journey{gap:5px}#journey button{font-size:13px}.number{display:none}}@media(max-width:650px){body{font-size:16px}.top{padding:18px 18px 8px;flex-wrap:wrap}.brand{font-size:21px}.tools{width:100%;justify-content:flex-start;font-size:13px;gap:7px}.tools a{margin-left:auto}.lesson-top{font-size:13px;margin:8px 0 16px;flex-wrap:wrap;gap:6px}.eyebrow{letter-spacing:0}main{padding:8px 16px}#journey{display:grid;grid-template-columns:repeat(4,1fr);gap:6px;margin-bottom:16px}#journey button{padding:10px 5px;font-size:14px}#stage{grid-template-columns:1fr;border-radius:24px;min-height:0}.story{padding:25px}.role{margin-bottom:18px;font-size:13px}.chapter-name{font-size:14px}h1{font-size:39px;white-space:normal;letter-spacing:0;margin-bottom:15px}.story-text{font-size:21px;margin-bottom:15px;line-height:1.6}.mascot-mood{font-size:14px}.activity{padding:26px 20px}.hero-art{min-height:0;height:auto;max-height:350px;object-position:center}.activity.activity-intro{min-height:260px}.choice .icon{font-size:55px}.choices{gap:9px}.choice{min-width:80px;font-size:17px;padding:20px 8px}.choice.action .icon{font-size:85px}.choice.action{min-width:220px}.feedback{font-size:20px;min-height:0}.prompt{font-size:17px}.bottom{gap:8px;padding:18px 0}.primary,.secondary{padding:14px 20px;font-size:16px}#page-label{font-size:13px}.activity-finish .choice{font-size:15px}.activity-finish .icon{font-size:36px}.teacher h1{font-size:34px}.teacher th,.teacher td{padding:9px;font-size:14px}.teacher .intro-box{padding:20px}.teacher ul,.teacher ol{padding-left:22px}.projector .choice{font-size:20px}.projector h1{font-size:42px}}
@media print{.top .tools,.bottom,.guide,footer{display:none}.teacher{max-width:none;font-size:12pt}.teacher h2{break-after:avoid}.teacher a{color:inherit}body{background:white}.teacher table{font-size:11pt}.teacher tr{break-inside:avoid}}

.mascot-thumb{width:56px;height:56px;object-fit:cover;object-position:25% center;border-radius:18px}.mascot-mood{flex-wrap:wrap}.mascot-mood .mood-icon{width:34px;height:34px;font-size:21px}

/* ZCO frozen master: preserve full silhouette and original proportions. */
.hero-art{object-fit:contain;padding:26px}.activity.activity-intro{background:#ddf4ff}.mascot-thumb{object-fit:contain;object-position:center}

.friend-intro{margin:0 0 20px;display:flex;align-items:center;justify-content:center;gap:18px;text-align:left}.friend-intro img{width:140px;height:105px;object-fit:contain;border-radius:18px}.friend-intro figcaption{font-size:16px;font-weight:700;max-width:170px;line-height:1.7}@media(max-width:650px){.friend-intro img{width:120px;height:90px}.friend-intro figcaption{font-size:15px}}

/* Opening: both confirmed characters appear immediately, with unchanged assets. */
.friends-welcome{display:grid;grid-template-columns:1fr 1fr;gap:18px;padding:30px;align-items:center;min-height:480px}.friends-welcome figure{margin:0;min-width:0}.friends-welcome .hero-art{width:100%;height:260px;min-height:0;object-fit:contain;padding:0}.friends-welcome .yaya-welcome{border-radius:22px}.friends-welcome figcaption{text-align:center;font-size:24px;font-weight:800;margin-top:15px}.friends-welcome small{display:block;font-size:16px;font-weight:600;margin-top:8px}#journey{display:grid;grid-template-columns:repeat(6,minmax(0,1fr))}#journey button{min-width:0}@media(max-width:900px){.friends-welcome{grid-template-columns:1fr;padding:24px;gap:22px}.friends-welcome .hero-art{height:190px}.friends-welcome figcaption{font-size:21px}#journey{grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:650px){.friends-welcome{grid-template-columns:1fr 1fr;min-height:260px;padding:20px 14px;gap:12px}.friends-welcome .hero-art{height:170px}.friends-welcome figcaption{font-size:19px}.friends-welcome small{font-size:14px}}

.audience{display:flex;flex-wrap:wrap;gap:.4rem 1rem;align-items:center;margin:0 0 1rem;padding:.8rem 1rem;border-radius:16px;background:#e0f4ec;color:#164950;font-size:.95rem}.audience strong{color:#006e62}.audience span{line-height:1.6}
/* v0.5: single Yaya host */
.solo-welcome{width:100%;text-align:center}.solo-welcome figure{margin:0}.solo-welcome .hero-art{width:100%;height:400px;min-height:0;object-fit:contain}.solo-welcome figcaption{padding:0 16px 24px;font-weight:800}.solo-welcome small{display:block;font-weight:500;margin-top:6px}@media(max-width:700px){.solo-welcome .hero-art{height:300px;min-height:0}}
@media(max-width:650px){#stage h1{white-space:pre-line}}

.loading-card{grid-column:1/-1;padding:32px;line-height:1.8}