:root{--bg:#fff8f0;--card:#fff;--ink:#2b2b2b;--muted:#6b6b6b;--primary:#ff7a59;--primary-dark:#e85d3a;--secondary:#4ecdc4;--accent:#ffe66d;--ok:#2ecc71;--bad:#e74c3c;--shadow:0 8px 24px rgba(43,43,43,.08);--radius:20px;--tap:52px}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:PingFang SC,Hiragino Sans GB,Noto Sans SC,system-ui,-apple-system,sans-serif;font-size:18px;line-height:1.5;-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}main{max-width:720px;margin:0 auto;padding:16px 16px 48px}h1{font-size:1.75rem}h1,h2{margin:0 0 8px}h2{font-size:1.4rem}h3{font-size:1.1rem;margin:0 0 8px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.brand{font-weight:800;font-size:1.15rem}.https-banner{background:#fff3cd;color:#856404;padding:10px 14px;border-radius:12px;margin-bottom:12px;font-size:.9rem}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:var(--tap);padding:12px 20px;border:none;border-radius:999px;font-size:1.05rem;font-weight:700;cursor:pointer;transition:transform .1s ease,background .15s ease}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;width:100%;margin-top:16px}.btn-primary:hover{background:var(--primary-dark)}.btn-secondary{background:var(--secondary);color:#fff}.btn-ghost{background:#f0f0f0;color:var(--ink)}.btn-record{background:#ff6b6b;color:#fff}.btn-stop{background:#333;color:#fff}.kid-grid{display:grid;grid-gap:16px;gap:16px;margin-top:20px}.kid-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;text-align:center;border:3px solid transparent;cursor:pointer;min-height:140px}.kid-card:focus,.kid-card:hover{border-color:var(--primary)}.kid-emoji{font-size:3rem;display:block;margin-bottom:8px}.kid-name{font-size:1.4rem;font-weight:800}.kid-meta{color:var(--muted);margin-top:4px}.pill{background:#fff;border-radius:999px;padding:8px 14px;font-size:.9rem;box-shadow:var(--shadow);font-weight:600}.section-title{margin:24px 0 12px;font-size:1.2rem}.lesson-list{display:grid;grid-gap:12px;gap:12px}.lesson-card{background:var(--card);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-card.locked{opacity:.65}.lesson-card .title{font-weight:800}.lesson-card .sub{color:var(--muted);font-size:.95rem}.badge{background:var(--accent);color:#5a4a00;font-weight:800;border-radius:999px;padding:6px 12px;font-size:.85rem;white-space:nowrap}.badge-soon{background:#eee;color:#888}.step-tabs{display:flex;gap:6px;overflow-x:auto;padding-bottom:8px;margin-bottom:8px;-webkit-overflow-scrolling:touch}.step-tab{flex:0 0 auto;min-height:40px;padding:8px 12px;border-radius:999px;border:none;background:#ffe8df;color:var(--ink);font-weight:700;font-size:.85rem}.step-tab.active{background:var(--primary);color:#fff}.step-tab.done{background:#d4f5e3}.step-panel{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-top:8px}.emoji-hero{font-size:4rem;text-align:center;margin-bottom:8px}.en-line{color:var(--muted);font-style:italic}.prompt-list{padding-left:1.2em;margin:16px 0}.prompt-list li{margin-bottom:10px;font-size:1.1rem}.hint{color:var(--muted);font-size:.95rem;margin:0 0 12px}.player-card,.sentence-card,.slide-stage{background:#f7fbff;border-radius:16px;padding:20px;text-align:center;margin-bottom:12px}.slide-emoji{font-size:3.5rem}.slide-poster{width:100%;max-width:560px;height:auto;border-radius:12px;margin:0 auto 8px;display:block}.slide-en{font-size:1.45rem;font-weight:800;margin:8px 0 4px}.slide-zh{font-size:1.1rem;color:var(--muted)}.video{width:100%;border-radius:12px;background:#000}.toolbar{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}.meta{text-align:center;color:var(--muted);font-size:.9rem}.warn{background:#ffe0e0;color:#a33;padding:10px 12px;border-radius:12px;margin:8px 0}.playback{margin:12px 0;text-align:center}.playback audio{width:100%;margin-top:8px}.quiz-stem{font-size:1.2rem;font-weight:700;margin-bottom:12px}.options{display:grid;grid-gap:10px;gap:10px}.option{min-height:var(--tap);border-radius:14px;border:2px solid #e8e8e8;background:#fff;font-size:1.05rem;font-weight:600;padding:12px 14px;text-align:left;cursor:pointer}.option-right{border-color:var(--ok);background:#eafaf1}.option-wrong{border-color:var(--bad);background:#fdecea}.explain{margin:12px 0;padding:12px;border-radius:12px;font-weight:600}.explain.ok{background:#eafaf1}.explain.bad{background:#fdecea}.explain p{font-weight:500;margin:6px 0 0}.prompt-zh{font-size:1.15rem;font-weight:700;margin-bottom:8px}.vocab-grid{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;margin:12px 0}.vocab-card{position:relative;background:#fff7e8;border:none;border-radius:16px;min-height:120px;padding:14px 10px 28px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;cursor:pointer}.vocab-card.flipped{background:#e8f7ff}.v-emoji{font-size:2rem}.v-word{font-size:1.15rem}.v-word,.v-zh{font-weight:800}.v-zh{font-size:1.2rem}.v-ipa{color:var(--muted);font-size:.85rem}.v-ex{font-size:.9rem;margin-top:4px}.speak-fab{position:absolute;right:8px;bottom:6px;font-size:1.1rem}.match-board{display:grid;grid-gap:12px;gap:12px;margin:12px 0}.match-col{display:grid;grid-gap:8px;gap:8px}.match-chip{min-height:48px;border-radius:12px;border:2px solid #e0e0e0;background:#fff;font-size:1rem;font-weight:700;padding:10px;cursor:pointer}.match-chip.picked{border-color:var(--primary);background:#ffe8df}.match-chip.matched{border-color:var(--ok);background:#eafaf1;opacity:.8}.ok-msg{color:var(--ok)}.checkin .stars-row,.ok-msg{text-align:center;font-weight:800}.checkin .stars-row{font-size:1.3rem;margin:12px 0}.stat-row{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;margin:16px 0}.stat{background:#fff7e8;border-radius:16px;padding:16px;text-align:center}.stat strong{display:block;font-size:2rem;color:var(--primary)}.stat span{color:var(--muted)}.parent-card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:16px}.parent-card h3{margin-bottom:4px}.progress-bar{height:12px;background:#eee;border-radius:999px;overflow:hidden;margin:8px 0}.progress-bar>span{display:block;height:100%;background:var(--secondary)}.note{background:#f0f4ff;border-radius:12px;padding:12px;font-size:.95rem;color:#345;margin-top:12px}@media (min-width:600px){.kid-grid{grid-template-columns:1fr 1fr}}.slide-audio{width:100%;margin-top:12px}.caption-box{text-align:center;margin:8px 0 4px}.celebrate-overlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;pointer-events:none;background:radial-gradient(circle at center,rgba(255,230,109,.35),transparent 60%);animation:fade-overlay .9s ease forwards}.celebrate-burst{position:relative;text-align:center}.celebrate-msg{font-size:1.8rem;font-weight:900;color:var(--primary-dark);background:#fff;border-radius:999px;padding:14px 28px;box-shadow:var(--shadow);animation:pop-in .35s cubic-bezier(.2,1.4,.4,1)}.celebrate-star{position:absolute;font-size:1.6rem;animation:float-star .85s ease-out forwards}.celebrate-star.s1{left:-40px;top:-10px}.celebrate-star.s2{right:-36px;top:-18px;animation-delay:.05s}.celebrate-star.s3{left:10px;top:-48px;animation-delay:.1s}.celebrate-star.s4{right:8px;bottom:-28px;animation-delay:.08s}@keyframes pop-in{0%{transform:scale(.4);opacity:0}to{transform:scale(1);opacity:1}}@keyframes float-star{0%{transform:translateY(12px) scale(.4);opacity:0}to{transform:translateY(-8px) scale(1.2);opacity:1}}@keyframes fade-overlay{0%{opacity:0}15%{opacity:1}70%{opacity:1}to{opacity:0}}.bounce-in{animation:pop-in .45s cubic-bezier(.2,1.4,.4,1)}.settle-hello,.settle-page .settle-title{text-align:center}.settle-hello{font-size:1.15rem;font-weight:700;color:var(--ink);font-style:normal}.settle-stars{display:flex;justify-content:center;gap:8px;margin:12px 0 4px;min-height:48px}.settle-star-pop{font-size:2.2rem;display:inline-block;animation:pop-in .4s cubic-bezier(.2,1.4,.4,1) both}.settle-stats .stat-big strong{font-size:2.4rem}.btn-xl{font-size:1.2rem;min-height:58px;margin-top:20px}.pulse-soft{animation:pulse-soft 1.4s ease-in-out infinite}@keyframes pulse-soft{0%,to{transform:scale(1)}50%{transform:scale(1.04)}}.kid-card-fun{border-radius:24px;background:linear-gradient(160deg,#fff,#fff3e8);transition:transform .15s ease,box-shadow .15s ease}.kid-card-fun:active{transform:scale(.98)}.kid-stats-row{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin-top:14px}.chip-muted,.chip-star,.chip-streak{display:inline-flex;align-items:center;gap:4px;border-radius:999px;padding:6px 12px;font-weight:800;font-size:.95rem}.chip-star{background:#fff3c4;color:#8a6a00}.chip-streak{background:#ffe0d4;color:#c03d1a}.chip-muted{background:#f0f0f0;color:var(--muted);font-weight:600}.parent-chips{justify-content:flex-start;margin:8px 0 12px}.hero-stats{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;margin:12px 0 20px}.hero-stat{border-radius:22px;padding:18px 14px;text-align:center;box-shadow:var(--shadow)}.hero-stat.star{background:linear-gradient(145deg,#fff8d6,#ffe66d)}.hero-stat.streak{background:linear-gradient(145deg,#ffe8df,#ffb4a2)}.hero-num{font-size:1.75rem;font-weight:900}.hero-label{color:#5a4a00;font-weight:700;font-size:.9rem;margin-top:4px}.lesson-card-fun{border-radius:22px;border:2px solid transparent;transition:border-color .15s ease,transform .1s ease}.lesson-card-fun:active{transform:scale(.99)}.badge-done{background:#d4f5e3;color:#1a7a45}.parent-subh{margin:16px 0 8px;font-size:1.05rem}.week-grid{display:grid;grid-template-columns:repeat(7,1fr);grid-gap:6px;gap:6px;margin-bottom:8px}.week-cell{text-align:center;background:#f7f7f7;border-radius:12px;padding:8px 4px 6px}.week-cell.active{background:#e8fff4}.week-bar-wrap{height:48px;display:flex;align-items:flex-end;justify-content:center}.week-bar{width:60%;max-width:18px;border-radius:6px 6px 2px 2px;background:linear-gradient(180deg,var(--secondary),#2ecc71);min-height:4px;transition:height .2s ease}.week-day{font-weight:800;font-size:.85rem;margin-top:4px}.week-meta{font-size:.75rem;color:var(--muted)}.stuck-list{background:#fff7f0;border-radius:12px;padding:10px 10px 10px 1.4em}.chip-review,.pill-review{display:inline-flex;align-items:center;gap:4px;border-radius:999px;padding:6px 12px;font-weight:800;font-size:.95rem;background:#e8f0ff;color:#2a4d9b}.pill-review{text-decoration:none;border:none;background:#dce8ff}.review-banner{display:flex;align-items:center;gap:12px;background:linear-gradient(135deg,#eef4ff,#ffe9f2);border-radius:18px;padding:14px 16px;margin:8px 0 16px;text-decoration:none;color:inherit;box-shadow:var(--shadow);font-weight:600}.review-banner-emoji{font-size:1.8rem}.review-prompt{text-align:center;background:#f7fbff;border-radius:16px;padding:20px;margin-bottom:12px}.review-emoji{font-size:3rem;margin-bottom:4px}.review-due-list{background:#f5f8ff;border-radius:12px;padding:10px 10px 10px 1.4em}.nav-links{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.course-module{margin-top:1.25rem}.course-module-head{margin-bottom:.6rem}.course-module-title{font-size:1.15rem;margin:0 0 .25rem}.course-module-hint{margin:0;color:var(--muted);font-size:.88rem;line-height:1.4}.pep-badge{display:inline-block;margin-top:6px;padding:3px 10px;border-radius:999px;font-size:.75rem;font-weight:800}.pep-badge-core{background:#dcfce7;color:#166534}.pep-badge-bridge{background:#ffedd5;color:#9a3412}.lesson-card-bridge{border:1.5px solid #fdba74}