:root{
  --nen:#fff7d6; --chu:#3b2a1a; --the:#ffffff; --bong:0 6px 0 rgba(0,0,0,.12);
  --vang:#ffd84d; --do:#ff6b6b; --xanh:#4dabf7; --la:#51cf66;
}
/* touch-action đặt cho MỌI phần tử: trình duyệt chỉ xét touch-action từ phần tử chạm tới vùng cuộn gần nhất (.than…), nên đặt ở body là không đủ (26/10) */
*{touch-action:pan-x pan-y;box-sizing:border-box;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
html,body{margin:0;height:100%;background:var(--nen);color:var(--chu);font-family:"Nunito","Segoe UI",system-ui,sans-serif;overflow:hidden;touch-action:pan-x pan-y}   /* không có pinch-zoom: chặn chụm 2 ngón + chạm đúp phóng to (22/10) */
button{font:inherit;color:inherit;border:0;cursor:pointer;background:none}
input{font:inherit;user-select:text;-webkit-user-select:text}
.man{position:fixed;inset:0;display:none;flex-direction:column;padding:max(12px,env(safe-area-inset-top)) 16px max(12px,env(safe-area-inset-bottom))}
.man.hien{display:flex}
.man.toi{background:#14163a}
.dau{display:flex;align-items:center;gap:12px;min-height:72px;flex:none}
.dau h1{margin:0;font-size:clamp(22px,5vw,40px);flex:1;text-align:center}
.cho{width:72px;flex:none;text-align:center}
.nut-ve{width:72px;height:72px;border-radius:50%;background:var(--the);box-shadow:var(--bong);font-size:38px;flex:none}
.nut-ve:active,.o:active,.the:active{transform:translateY(4px);box-shadow:0 2px 0 rgba(0,0,0,.12)}
.than{flex:1;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;padding:8px 0 40px;min-height:0}

/* Trang chủ */
.tieude{text-align:center;font-size:clamp(28px,6vw,48px);font-weight:900;margin:8px 0 4px}
.luoi-chu{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;align-content:center}
.o{border-radius:36px;box-shadow:var(--bong);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:190px;font-size:clamp(22px,4vw,32px);font-weight:900;color:#fff;text-shadow:0 2px 0 rgba(0,0,0,.18)}
.o .bieu{font-size:clamp(70px,13vw,110px);line-height:1;text-shadow:none}
.o.nho{min-height:150px;font-size:clamp(18px,3vw,24px)}
.o.nho .bieu{font-size:clamp(56px,10vw,80px)}
.luoi-tc{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px;align-content:start}

/* Lưới chung */
.luoi{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:14px}
.the{background:var(--the);border-radius:28px;box-shadow:var(--bong);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:140px;font-size:22px;font-weight:800;padding:8px}
.the .bieu{font-size:72px;line-height:1.1}
.nhay{animation:nhay .6s}
@keyframes nhay{0%{transform:scale(1)}30%{transform:scale(1.25) rotate(-6deg)}60%{transform:scale(.95) rotate(4deg)}100%{transform:scale(1)}}
.lac{animation:lac .5s}
@keyframes lac{0%,100%{transform:translateX(0)}20%{transform:translateX(-14px)}40%{transform:translateX(14px)}60%{transform:translateX(-8px)}80%{transform:translateX(8px)}}

/* Clip */
.clip{background:var(--the);border-radius:24px;box-shadow:var(--bong);overflow:hidden;text-align:left;padding:0;display:flex;flex-direction:column}
.clip img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;background:#eee}
.clip span{padding:10px 12px 14px;font-size:18px;font-weight:800;line-height:1.25}
.luoi-clip{grid-template-columns:repeat(auto-fill,minmax(220px,1fr))}
#khungphat{position:fixed;inset:0;background:#000;display:none;z-index:50}
#khungphat.hien{display:block}
#khungphat .vung{width:100%;height:100%}
#khungphat .vung iframe{width:100%;height:100%;border:0}
#dongphat{position:absolute;top:max(12px,env(safe-area-inset-top));left:12px;z-index:2}

/* Ú òa */
#vunguoa{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;height:100%;min-height:320px}
.cua{position:relative;border-radius:32px;perspective:900px;min-height:140px}
.cua .mat{position:absolute;inset:0;border-radius:32px;display:flex;align-items:center;justify-content:center;backface-visibility:hidden;-webkit-backface-visibility:hidden;transition:transform .5s;box-shadow:var(--bong)}
.cua .truoc{font-size:clamp(70px,14vw,130px)}
.cua .sau{background:#fff;transform:rotateY(180deg);flex-direction:column;font-size:clamp(64px,13vw,120px)}
.cua .sau small{font-size:clamp(18px,3vw,26px);font-weight:900}
.cua.mo .truoc{transform:rotateY(-180deg)}
.cua.mo .sau{transform:rotateY(0)}

/* Con nào đây */
.o small.vn{font-size:clamp(14px,2.2vw,18px);font-weight:700;opacity:.9}
.the-en{min-height:170px;gap:2px}
.the-en .tu{font-size:clamp(22px,4vw,30px);font-weight:900;color:#1c3f94}
.the-en .vn{font-size:14px;color:#8a7a66;font-weight:700}
.o-mau{width:84px;height:84px;border-radius:50%;box-shadow:inset 0 0 0 3px rgba(0,0,0,.08)}
.so-to{font-size:72px;font-weight:900;line-height:1;color:#e8590c}
.cham{font-size:14px;letter-spacing:2px;color:#fab005;max-width:110px;text-align:center;line-height:1.1}
.vung-lua,#vungtim{display:flex;gap:20px;justify-content:center;align-items:stretch;height:100%;min-height:260px;flex-wrap:wrap}
.lua{flex:1 1 240px;max-width:420px;background:#fff;border-radius:36px;box-shadow:var(--bong);font-size:clamp(110px,24vw,200px);display:flex;align-items:center;justify-content:center;min-height:220px}
.lua.dung{background:#d3f9d8}

/* Đàn */
#vungdan{flex:1;display:flex;gap:6px;min-height:0;padding-bottom:30px}
.phim{flex:1;min-width:0;border-radius:0 0 26px 26px;box-shadow:var(--bong);display:flex;flex-direction:column;justify-content:flex-end;align-items:center;padding-bottom:18px;font-size:clamp(28px,6vw,52px);transition:transform .08s,filter .08s}
.phim.an{transform:translateY(6px);filter:brightness(1.2)}

/* Tắm */
#vungtam{flex:1;position:relative;border-radius:32px;overflow:hidden;background:linear-gradient(#e7f5ff,#d0ebff);box-shadow:var(--bong);min-height:0;margin-bottom:30px}
#contam{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:min(60vw,52vh)}
#bun{position:absolute;inset:0;width:100%;height:100%;touch-action:none}

/* Chạm là sáng */
#bausang{flex:1;width:100%;touch-action:none;border-radius:28px;min-height:0;margin-bottom:30px}

/* Xe */
#vungxe{flex:1;display:flex;flex-direction:column;gap:10px;min-height:0;padding-bottom:30px}
.lan{flex:1;position:relative;background:#868e96;border-radius:22px;overflow:hidden;box-shadow:var(--bong)}
.lan::after{content:"";position:absolute;left:0;right:0;top:50%;border-top:6px dashed rgba(255,255,255,.7)}
.lan.troi{background:linear-gradient(#a5d8ff,#d0ebff)}
.lan.troi::after,.lan.nuoc::after{display:none}
.lan.nuoc{background:linear-gradient(#74c0fc,#339af0)}
.lan.ray::after{border-top:8px solid #5c3d2e}
.xe{position:absolute;top:50%;right:8%;font-size:clamp(56px,11vh,110px);line-height:1;transform:translate(0,-50%);z-index:1}

/* Màu sắc */
.mau{min-height:140px;border-radius:50%;aspect-ratio:1;box-shadow:var(--bong)}
#phumau{position:fixed;inset:0;display:none;align-items:center;justify-content:center;font-size:clamp(48px,12vw,120px);font-weight:900;color:#fff;text-shadow:0 4px 0 rgba(0,0,0,.25);z-index:40}
#phumau.hien{display:flex}

/* Đếm */
#vungdem{display:flex;flex-wrap:wrap;justify-content:center;align-content:center;gap:12px;min-height:100%}
.vat{font-size:clamp(70px,15vw,120px);line-height:1;transition:transform .2s,opacity .2s}
.vat.da{opacity:.35;transform:scale(.85)}
#sodem{font-size:clamp(80px,20vw,160px);font-weight:900;text-align:center;color:var(--do);min-height:1.1em;line-height:1.1}

/* Bóng bay */
#vungbong{position:relative;flex:1;overflow:hidden;border-radius:28px;background:linear-gradient(#bde0fe,#e7f5ff);margin-bottom:30px}
.bong{position:absolute;bottom:-160px;width:120px;height:150px;border-radius:50% 50% 48% 48%;will-change:transform}
.bong::after{content:"";position:absolute;left:50%;top:100%;width:2px;height:50px;background:rgba(0,0,0,.25)}
.vo{position:absolute;font-size:60px;pointer-events:none;animation:vo .5s forwards}
@keyframes vo{to{transform:scale(2);opacity:0}}
#diembong{font-size:36px;font-weight:900}

/* Vẽ */
#vungve{flex:1;display:flex;flex-direction:column;gap:12px;min-height:0;padding-bottom:30px}
#bangve{flex:1;width:100%;background:#fff;border-radius:28px;box-shadow:var(--bong);touch-action:none;min-height:0}
.hopbut{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.but{width:60px;height:60px;border-radius:50%;box-shadow:var(--bong);border:5px solid #fff}
.but.chon{outline:5px solid var(--chu)}

/* Pháo hoa khen */
#phaohoa{position:fixed;inset:0;pointer-events:none;z-index:45;overflow:hidden}
.sao{position:absolute;font-size:40px;animation:bay 1.2s ease-out forwards}
@keyframes bay{from{transform:translate(0,0) scale(.5);opacity:1}to{transform:translate(var(--dx),var(--dy)) scale(1.3);opacity:0}}

/* Bố mẹ */
#nutbome{position:fixed;right:10px;bottom:max(6px,env(safe-area-inset-bottom));font-size:13px;opacity:.55;padding:8px 10px;z-index:30;border-radius:12px;overflow:hidden}
#nutbome i,.giu i{position:absolute;left:0;top:0;bottom:0;width:0;background:rgba(0,0,0,.15)}
#hopbome,#hetgio{position:fixed;inset:0;background:rgba(59,42,26,.55);display:none;align-items:center;justify-content:center;z-index:60;padding:16px}
#hopbome.hien,#hetgio.hien{display:flex}
.hop{background:#fff;border-radius:28px;padding:24px;max-width:440px;width:100%;text-align:center}
.hop h2{margin:0 0 8px}
.hop p{margin:6px 0 14px;font-size:17px}
.hangnut{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.hangnut button,.nut-bm{background:var(--vang);border-radius:18px;padding:12px 18px;font-size:18px;font-weight:800;box-shadow:var(--bong)}
.nut-xam{background:#eee;border-radius:18px;padding:12px 22px;font-size:17px;font-weight:800;position:relative;overflow:hidden}
#hetgio .hop{font-size:22px}
#hetgio .bieu{font-size:96px}

/* Quản lý clip */
.bome .than{max-width:760px;width:100%;margin:0 auto}
.the-bm{background:#fff;border-radius:24px;box-shadow:var(--bong);padding:18px;margin-bottom:16px}
.the-bm h2{margin:0 0 8px;font-size:22px}
.the-bm input[type=password],.the-bm input[type=url],.the-bm input[type=text]{width:100%;font-size:18px;padding:12px 14px;border:2px solid #e9ddb5;border-radius:14px;margin:6px 0;background:#fffdf5}
.the-bm .nut-bm{margin-top:6px}
.nho{font-size:15px;color:#6b5a45}
.loi{color:#c92a2a;font-weight:700;min-height:1.2em}
.hangchon{display:flex;gap:10px;flex-wrap:wrap;margin:6px 0}
.hangchon label{background:#fff4c2;border-radius:12px;padding:8px 12px;font-weight:700}
.tab-bm{background:#f1f3f5;border-radius:14px;padding:10px 14px;font-weight:800}
.tab-bm.chon{background:var(--vang)}
.dong-clip{display:flex;align-items:center;gap:10px;padding:8px 0;border-bottom:1px solid #f1e7c6}
.dong-clip img{width:96px;aspect-ratio:16/9;object-fit:cover;border-radius:8px;flex:none;background:#eee}
.dong-clip span{flex:1;font-weight:700;font-size:16px;line-height:1.25;word-break:break-word}
.dong-clip button{font-size:22px;padding:6px 8px;border-radius:10px;background:#f8f9fa}

/* ===== Bản 4: sao thưởng, hoan hô, trò mới ===== */
.tieude .dem-sao{font-size:.55em;background:#fff;border-radius:999px;padding:4px 12px;box-shadow:var(--bong);vertical-align:middle}
.cho.dem-sao{font-size:20px;font-weight:900;width:auto;min-width:72px;background:#fff;border-radius:999px;padding:8px 10px;box-shadow:var(--bong)}
#hoanho{position:fixed;inset:0;display:none;align-items:center;justify-content:center;z-index:55;background:rgba(255,247,214,.6);pointer-events:none}
#hoanho.hien{display:flex}
.hop-hh{background:#fff;border-radius:36px;padding:24px 36px;text-align:center;box-shadow:0 10px 0 rgba(0,0,0,.12);animation:nayvao .5s}
.hop-hh .sao-to{font-size:110px;line-height:1;animation:xoay 1.2s linear infinite}
.hop-hh .chu{font-size:clamp(26px,6vw,46px);font-weight:900;margin-top:8px}
.hop-hh .nho-hh{font-size:22px;font-weight:900;color:#f59f00}
@keyframes nayvao{0%{transform:scale(.3)}70%{transform:scale(1.1)}100%{transform:scale(1)}}
@keyframes xoay{to{transform:rotate(360deg)}}
.hangnut button.chon,.hang-che button.chon{background:#ff922b;color:#fff}
.hang-che{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:4px 0 8px;flex:none}
.hang-che button{background:#fff;border-radius:16px;padding:10px 16px;font-size:18px;font-weight:900;box-shadow:var(--bong)}

/* ===== Bốn trò tự viết (16/10, thay 4 trò theo mẫu AI Studio) ===== */
/* Đưa xe về nhà */
.khung-xn{display:flex;flex-direction:column;gap:8px;overflow:hidden;padding-bottom:12px}
.chon-xe{display:flex;gap:8px;overflow-x:auto;flex:none;padding:2px 2px 8px;touch-action:pan-x}
.chip-xe{flex:none;background:#fff;border-radius:18px;padding:4px 10px;display:flex;flex-direction:column;align-items:center;box-shadow:var(--bong);border:4px solid transparent;min-width:78px}
.chip-xe span{font-size:38px;line-height:1.15}
.chip-xe small{font-weight:900;font-size:13px;white-space:nowrap}
.chip-xe.chon{border-color:#f59f00;background:#fff4e6}
.ban-do-xn{position:relative;flex:1;min-height:0}
.nut-coi{position:absolute;right:12px;bottom:12px;width:clamp(76px,11vw,104px);height:clamp(76px,11vw,104px);border-radius:50%;background:linear-gradient(#ffd43b,#fab005);box-shadow:0 6px 0 #e67700;font-size:clamp(38px,5.5vw,52px);z-index:2}
.nut-coi:active{transform:translateY(4px);box-shadow:0 2px 0 #e67700}
#xnbando{width:100%;height:100%;display:block;touch-action:none;cursor:pointer}
/* Đồ của gấu */
.khung-gau{display:flex;flex-direction:column;align-items:center;gap:14px}
.do-gau{background:#fff;border-radius:36px;box-shadow:var(--bong);width:min(320px,70vw);height:clamp(140px,26vh,220px);display:flex;align-items:center;justify-content:center;line-height:1;flex:none;transition:transform .5s,opacity .5s}
.do-gau.to{font-size:clamp(100px,19vh,170px)}
.do-gau.nho{font-size:clamp(38px,7vh,58px)}
.do-gau.bay-bo,.do-gau.bay-con{opacity:0;transform:translateY(140px) scale(.4)}
#vunggau{display:flex;gap:18px;width:100%;max-width:820px;flex:1;min-height:220px}
#vunggau.dao{flex-direction:row-reverse}
.o-gau{flex:1;background:#fff4e6;border-radius:36px;box-shadow:var(--bong);display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding:12px 8px 14px;gap:4px;border:5px solid #ffd8a8}
.o-gau .gau{line-height:1}
.o-gau.bo .gau{font-size:clamp(110px,22vh,190px)}
.o-gau.con .gau{font-size:clamp(50px,10vh,84px)}
.o-gau b{font-size:clamp(20px,3vw,28px);font-weight:900}
.o-gau .khay{min-height:36px;font-size:30px;display:flex;flex-wrap:wrap;justify-content:center;gap:2px;line-height:1.1}
.o-gau.con .khay{font-size:18px}
/* Bóng của ai */
.khung-bong{display:flex;flex-direction:column;align-items:center;gap:16px}
.bong-to{background:#fff;border-radius:36px;box-shadow:var(--bong);width:min(360px,80vw);height:clamp(160px,32vh,280px);font-size:clamp(110px,22vh,200px);line-height:1;display:flex;align-items:center;justify-content:center;flex:none}
.bong-to span{filter:brightness(0);opacity:.85;transition:filter .8s,opacity .8s}
.bong-to.lo span{filter:none;opacity:1}
#vungbongai{width:100%;min-height:200px;flex:1}
/* Hộp thả hình */
.khung-hop{display:flex;flex-direction:column;align-items:center;gap:18px}
.hop-go{display:flex;gap:clamp(10px,3vw,28px);justify-content:center;background:linear-gradient(#e8a96a,#c98a4b);border-radius:28px;padding:clamp(14px,3vw,26px);box-shadow:0 10px 0 #9c6430;border:6px solid #b97a3e;width:min(760px,100%);flex:none}
.lo-hinh{flex:1;max-width:200px;aspect-ratio:1;background:#a86b35;border-radius:22px;padding:clamp(8px,2vw,16px);box-shadow:inset 0 6px 0 rgba(0,0,0,.2)}
.lo-hinh,.khoi-hinh{display:flex;align-items:center;justify-content:center}
.lo-hinh svg,.khoi-hinh svg{width:100%;height:auto;aspect-ratio:1;display:block}
.lo-hinh.tren{outline:6px solid #fff3bf}
.lo-hinh.day{background:#d3f9d8;box-shadow:none}
.lo-hinh.goi-y{animation:goiy .8s 2}
@keyframes goiy{50%{outline:6px solid #ffd43b;transform:scale(1.07)}}
.khay-hinh{display:flex;gap:clamp(10px,3vw,28px);justify-content:center;align-items:center;width:min(760px,100%);flex:1;min-height:150px}
.khoi-hinh{flex:1;max-width:180px;aspect-ratio:1;background:#fff;border-radius:26px;box-shadow:var(--bong);padding:clamp(8px,1.6vw,14px);touch-action:none;cursor:grab;position:relative}
.khoi-hinh svg{pointer-events:none}
.khoi-hinh.dang-keo{z-index:5;box-shadow:0 16px 24px rgba(0,0,0,.22);cursor:grabbing}
.khoi-hinh.chon{outline:6px solid #ffd43b}
.khoi-hinh.vao{visibility:hidden}

/* ===== Sửa hiển thị điện thoại (15/10) ===== */
/* Căn giữa nhưng không làm mất phần tràn phía trên */
.luoi-chu{align-content:start;align-content:safe center;grid-template-columns:repeat(auto-fit,minmax(min(200px,40vw),1fr))}
#nutbome{background:rgba(255,247,214,.85)}
@media (max-width:640px){
  .man{padding-left:12px;padding-right:12px}
  .luoi-chu{grid-template-columns:repeat(2,1fr);gap:14px}
  .o{min-height:150px;border-radius:28px;font-size:20px}
  .o .bieu{font-size:64px}
  .o.nho{min-height:128px;font-size:17px}
  .o.nho .bieu{font-size:52px}
  .luoi-tc{grid-template-columns:repeat(2,1fr);gap:12px}
  .tieude{font-size:28px}
  .dau{min-height:60px;gap:8px}
  .nut-ve{width:58px;height:58px;font-size:30px}
  .cho{width:58px}
  .dau h1{font-size:21px}
  .lua{min-height:170px;flex-basis:140px}
  .vung-lua,#vungtim{gap:12px}
  .hang-che button{font-size:15px;padding:8px 12px}
}

/* ===== Nhóm clip (15/10) ===== */
.nhom-tab{position:sticky;top:0;z-index:2}
.nhom-tab button{font-size:clamp(16px,2.6vw,20px);padding:10px 16px}
.chon-nhom{width:100%;font:inherit;font-size:18px;padding:10px 12px;border:2px solid #e9ddb5;border-radius:14px;margin:6px 0;background:#fffdf5}
.nhan-nhom{display:inline-block;background:#fff4c2;border-radius:8px;padding:1px 8px;font-size:12px;font-weight:800;color:#8a6d1f}
@media (max-width:640px){ .nhom-tab{flex-wrap:nowrap;overflow-x:auto;justify-content:flex-start;padding:2px 2px 8px} .nhom-tab button{flex:none} }
@media (max-width:640px){ .luoi-clip{grid-template-columns:repeat(2,1fr);gap:10px} .clip{border-radius:18px} .clip span{font-size:15px;padding:8px 10px 10px} }

/* ===== Chế độ xóa clip (15/10) ===== */
.nut-do,.nut-xoa-do{background:#ffe3e3 !important;color:#c92a2a !important;font-weight:900}
.dong-clip .nut-xoa-do{font-size:16px;padding:8px 10px}
#thanhxoa{display:none;position:fixed;left:0;right:0;top:0;z-index:58;background:#c92a2a;color:#fff;padding:10px 12px;gap:8px;align-items:center;justify-content:center;flex-wrap:wrap;box-shadow:0 4px 0 rgba(0,0,0,.15)}
body.dang-xoa #thanhxoa{display:flex}
#thanhxoa .hangnut button{padding:8px 12px;font-size:15px}
body.dang-xoa .man{padding-top:calc(max(12px,env(safe-area-inset-top)) + 64px)}
.clip{position:relative}
.clip.dang-xoa{outline:4px dashed #e03131;outline-offset:-4px}
.clip .dau-xoa{position:absolute;top:8px;right:8px;background:#e03131;color:#fff;font-style:normal;font-weight:900;border-radius:12px;padding:6px 10px;font-size:15px;box-shadow:0 3px 0 rgba(0,0,0,.2)}
#hoppin{position:fixed;inset:0;background:rgba(59,42,26,.55);display:none;align-items:center;justify-content:center;z-index:62;padding:16px}
#hoppin.hien{display:flex}
#hoppin input{width:100%;font-size:22px;padding:12px;border:2px solid #e9ddb5;border-radius:14px;text-align:center;margin:8px 0}

/* ===== Mục Ảnh (15/10) ===== */
#anh .the-bm{max-width:460px;margin:20px auto;text-align:center}
#anh .the-bm input{width:100%;font-size:20px;padding:12px;border:2px solid #e9ddb5;border-radius:14px;text-align:center;margin:8px 0}
.luoi-anh{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.o-anh{aspect-ratio:1;border-radius:16px;overflow:hidden;background:#f1e7c6;box-shadow:var(--bong);padding:0}
.o-anh img{width:100%;height:100%;object-fit:cover;display:block}
@media (max-width:640px){ .luoi-anh{grid-template-columns:repeat(3,1fr);gap:6px} .o-anh{border-radius:10px} }
#xemanh{position:fixed;inset:0;background:#111;display:none;z-index:52;align-items:center;justify-content:center}
#xemanh.hien{display:flex}
#xemanhimg{max-width:100%;max-height:100%;object-fit:contain;touch-action:pan-y;user-select:none}
#xemanhdong{position:absolute;top:max(12px,env(safe-area-inset-top));left:12px}
.nut-chuyen{position:absolute;top:50%;transform:translateY(-50%);width:64px;height:96px;border-radius:20px;background:rgba(255,255,255,.18);color:#fff;font-size:56px;font-weight:900;line-height:1}
.nut-chuyen.trai{left:8px}.nut-chuyen.phai{right:8px}
.thanh-xem{position:absolute;bottom:max(14px,env(safe-area-inset-bottom));left:0;right:0;display:flex;gap:14px;justify-content:center;align-items:center;color:#fff;font-weight:900}
.thanh-xem a{text-decoration:none;color:#3b2a1a}
#qlanh code{background:#f1f3f5;border-radius:6px;padding:1px 5px}
#qlanh input[type=file]{margin:6px 0 10px;font-size:15px}
#qlanhtt div{margin:2px 0}
/* Tải ảnh lên (bố mẹ) */
.nut-tai{display:inline-block;cursor:pointer;margin:6px 0}
.luoi-anh-ql{grid-template-columns:repeat(auto-fill,minmax(96px,1fr));margin-top:8px}
.luoi-anh-ql .o-anh{position:relative}
.xoa-anh{position:absolute;top:4px;right:4px;background:#e03131;color:#fff;border-radius:10px;padding:4px 6px;font-size:16px}
#qlanh summary{cursor:pointer;font-weight:800}

/* ===== Bé rồng (bé tuổi Rồng) ===== */
.rong-hong{--than:#ff9ec4;--dam:#f06595;--canh:#ffd1e3}
.rong-xanhduong{--than:#74c0fc;--dam:#339af0;--canh:#c5e6ff}
.rong-tim{--than:#b197fc;--dam:#7950f2;--canh:#e0d4ff}
.rong-cam{--than:#ffb366;--dam:#f76707;--canh:#ffe0b8}
.tieude{display:flex;align-items:center;justify-content:center;gap:6px;flex-wrap:wrap;position:relative;z-index:1}
.rong-tieude{width:clamp(52px,9vw,84px);height:clamp(52px,9vw,84px);animation:lac-rong 2.4s ease-in-out infinite}
.rong-tieude.phai{animation-delay:1.2s;transform:scaleX(-1)}
@keyframes lac-rong{0%,100%{rotate:-6deg;translate:0 0}50%{rotate:6deg;translate:0 -6px}}
button.dem-sao{border:0;cursor:pointer;font:inherit;font-weight:900}
/* Rồng bay ở nền trang chủ */
#trangchu{overflow:hidden}
#trangchu .than{position:relative;z-index:1}
.rong-nen{position:absolute;inset:0;pointer-events:none;z-index:0}
.rb{position:absolute;width:clamp(60px,10vw,110px);height:clamp(60px,10vw,110px);opacity:.9;animation:bay-rong 7s ease-in-out infinite}
.rb.r1{left:2%;bottom:3%;animation-delay:0s}
.rb.r2{right:3%;bottom:6%;animation-delay:-2s;transform:scaleX(-1)}
.rb.r3{left:4%;top:16%;width:clamp(44px,7vw,80px);height:clamp(44px,7vw,80px);animation-delay:-4s;opacity:.7}
.rb.r4{right:5%;top:14%;width:clamp(44px,7vw,80px);height:clamp(44px,7vw,80px);animation-delay:-5.5s;opacity:.7;transform:scaleX(-1)}
@keyframes bay-rong{0%,100%{translate:0 0;rotate:-4deg}25%{translate:6px -14px;rotate:3deg}50%{translate:0 -24px;rotate:-2deg}75%{translate:-6px -10px;rotate:4deg}}
.rb .canh-rong,.rong-hh .canh-rong{transform-origin:60px 60px;animation:vo-canh .5s ease-in-out infinite alternate}
@keyframes vo-canh{from{transform:scaleY(1)}to{transform:scaleY(.8)}}
.may-nen{position:absolute;font-size:clamp(28px,5vw,48px);opacity:.55}
.may-nen.m1{left:30%;top:9%}.may-nen.m2{right:22%;top:20%}.may-nen.m3{left:46%;bottom:4%;opacity:.7}
@media (max-width:640px){ .rb.r3,.rb.r4,.may-nen.m2{display:none} .rb.r1,.rb.r2{bottom:1%} }
/* Rồng nhảy múa khi hoan hô */
.rong-hh{width:130px;height:130px;animation:mua-rong .6s ease-in-out infinite alternate}
.rong-hh.nho{width:96px;height:96px;animation-duration:1.2s}
@keyframes mua-rong{from{rotate:-10deg;translate:0 0}to{rotate:10deg;translate:0 -12px}}
#hopsao{position:fixed;inset:0;background:rgba(59,42,26,.55);display:none;align-items:center;justify-content:center;z-index:61;padding:16px}
#hopsao.hien{display:flex}
@media (prefers-reduced-motion: reduce){ .rb,.rong-tieude,.rong-hh,.rb .canh-rong{animation:none} }
.co{width:1.4em;height:.7em;vertical-align:-0.05em;border-radius:2px}
.co-to{width:1.6em;height:.8em;border-radius:6px;box-shadow:0 2px 0 rgba(0,0,0,.2);display:block}

/* ===== Bé rồng chibi bản 2: bay qua lại trong nền ===== */
.rong-hong{--than:#ffb6d5;--dam:#f48fb1;--canh:#ffe0ee;--canh2:#ffc9de;--gai:#b197fc}
.rong-xanhduong{--than:#a5d8ff;--dam:#74b9f0;--canh:#dff0ff;--canh2:#c5e3ff;--gai:#ffd43b}
.rong-tim{--than:#cdb4ff;--dam:#a685f0;--canh:#efe6ff;--canh2:#ddccff;--gai:#8ce99a}
.rong-cam{--than:#ffc58f;--dam:#f59f50;--canh:#ffebd6;--canh2:#ffd9b0;--gai:#ff8fab}
.rb{display:none}
.rong-tieude{width:clamp(62px,11vw,100px);height:clamp(48px,8.5vw,78px);animation:lac-rong 2.4s ease-in-out infinite}
.rong-hh{width:150px;height:116px}
.rong-hh.nho{width:110px;height:85px}
.bay{position:absolute;left:0;width:clamp(78px,12vw,130px);will-change:transform;animation:bay-ngang 22s linear infinite}
.bay .nhun{display:block;width:100%;height:auto;aspect-ratio:160/124;animation:nhun 2.2s ease-in-out infinite;filter:drop-shadow(0 6px 4px rgba(0,0,0,.08))}
.bay.b1{top:15%;animation-duration:20s;animation-delay:-3s}
.bay.b2{top:58%;animation-duration:26s;animation-delay:-15s}
.bay.b3{top:80%;animation-duration:23s;animation-delay:-8s}
.bay.b4{top:36%;animation-duration:30s;animation-delay:-22s;width:clamp(60px,9vw,96px);opacity:.85}
.bay.b2 .nhun{animation-delay:-.7s}.bay.b3 .nhun{animation-delay:-1.3s}.bay.b4 .nhun{animation-delay:-.4s}
/* bay sang phải, quay đầu, bay về trái */
@keyframes bay-ngang{
  0%{transform:translateX(-160px) scaleX(1)}
  48%{transform:translateX(calc(100vw + 20px)) scaleX(1)}
  50%{transform:translateX(calc(100vw + 20px)) scaleX(-1)}
  98%{transform:translateX(-160px) scaleX(-1)}
  100%{transform:translateX(-160px) scaleX(1)}
}
@keyframes nhun{0%,100%{translate:0 0;rotate:-3deg}50%{translate:0 -16px;rotate:4deg}}
.may-nen{animation:troi-may 40s linear infinite}
.may-nen{right:auto}
.may-nen.m1{top:8%;left:0}.may-nen.m2{top:46%;left:0;animation-duration:55s;animation-delay:-20s}.may-nen.m3{top:72%;left:0;animation-duration:48s;animation-delay:-35s;opacity:.45}
@keyframes troi-may{from{transform:translateX(-80px)}to{transform:translateX(calc(100vw + 40px))}}
@media (max-width:640px){
  .bay{width:72px}.bay.b4{display:none}
  .bay.b1{top:11%}.bay.b2{top:52%}.bay.b3{top:86%}
  .may-nen.m2{display:inline}
}
/* 01/11: thêm rồng (8 con, nhiều màu, to nhỏ khác nhau; b5–b8 bay ngược chiều) */
.bay.b5{top:25%;animation-duration:27s;animation-delay:-5s;animation-direction:reverse;width:clamp(56px,8vw,90px)}
.bay.b6{top:74%;animation-duration:19s;animation-delay:-12s;animation-direction:reverse;width:clamp(70px,10vw,115px)}
.bay.b7{top:5%;animation-duration:34s;animation-delay:-27s;width:clamp(50px,7vw,80px)}
.bay.b8{top:91%;animation-duration:24s;animation-delay:-18s;animation-direction:reverse;width:clamp(64px,9.5vw,105px)}
.bay.b5 .nhun{animation-delay:-1s}.bay.b6 .nhun{animation-delay:-1.7s}.bay.b7 .nhun{animation-delay:-.2s;animation-duration:1.8s}.bay.b8 .nhun{animation-delay:-.9s;animation-duration:2.6s}
/* rồng nằm sau các ô, nên đặt ở khoảng trống trên/dưới các ô và rõ hơn */
.bay.b2{top:84%}.bay.b4{top:31%}
#trangchu .bay{opacity:.85}
@media (max-width:640px){
  .bay.b4{display:block;width:56px}.bay.b4{top:30%}
  .bay.b5{top:20%;width:52px}.bay.b6{top:70%;width:64px}.bay.b7{top:4%;width:48px}.bay.b8{top:42%;width:58px}
}
@media (prefers-reduced-motion: reduce){ .bay,.bay .nhun,.may-nen{animation:none} .bay{left:4%} }
/* Rồng bé trai: mặc định xanh lá, gai cam; thêm xanh ngọc; xanh dương/cam gai vàng-cam */
.rong-xanhduong{--than:#9fd4ff;--dam:#5aa9e6;--canh:#dcefff;--canh2:#bfe0ff;--gai:#ffa94d}
.rong-cam{--than:#ffc27a;--dam:#f08c2e;--canh:#ffe8c8;--canh2:#ffd49c;--gai:#4dabf7}
.rong-xanhngoc{--than:#7fe0d0;--dam:#3cbfa8;--canh:#d5f7f1;--canh2:#b0ece2;--gai:#ffd43b}

/* ===== Chữ cái (16/10) ===== */
#khungchu[data-che=hoc] #vungchu,#khungchu[data-che=tim] #luoichu{display:none}
.luoi-chu-cai{grid-template-columns:repeat(auto-fill,minmax(104px,1fr));gap:12px}
.the-chu{min-height:104px;padding:4px}
.chu-to{font-family:"Nunito","Segoe UI",Arial,sans-serif;font-weight:900;line-height:1;letter-spacing:2px}
.the-chu .chu-to{font-size:46px}
.lua-chu{flex-direction:column;gap:6px}
.lua-chu .chu-to{font-size:clamp(90px,18vw,160px)}
.lua-chu .hinh-nho{font-size:clamp(40px,7vw,64px);line-height:1}
.chu-xem{position:fixed;inset:0;display:none;flex-direction:column;align-items:center;justify-content:center;gap:10px;background:rgba(255,247,214,.94);z-index:40}
.chu-xem.hien{display:flex}
.chu-xem .chu-to{font-size:clamp(110px,26vw,220px)}
.chu-xem .hinh-chu{font-size:clamp(90px,18vw,160px);line-height:1}
.chu-xem b{font-size:clamp(26px,5vw,40px);font-weight:900}
@media (max-width:640px){ .luoi-chu-cai{grid-template-columns:repeat(4,1fr);gap:8px} .the-chu{min-height:76px;border-radius:20px} .the-chu .chu-to{font-size:32px} }
/* ===== Giao diện bản 12 (17/10): theo nguyên tắc thiết kế cho trẻ 2 tuổi =====
   Thẻ trắng + vùng màu nhạt chứa hình to, chữ tối dễ đọc; bóng đổ màu đậm của chính thẻ để trông "bấm được". */
.o{--mau:#4dabf7;background:#fff;color:var(--chu);text-shadow:none;justify-content:flex-start;gap:0;padding:10px 10px 12px;border-radius:30px;box-shadow:0 7px 0 rgba(0,0,0,.14);box-shadow:0 7px 0 color-mix(in srgb,var(--mau) 60%,#5c3d1e);transition:transform .08s}
.o:active{transform:translateY(5px);box-shadow:0 2px 0 color-mix(in srgb,var(--mau) 60%,#5c3d1e)}
.o .bieu{flex:1;width:100%;min-height:0;display:flex;align-items:center;justify-content:center;border-radius:22px;background:#f1f3f5;background:color-mix(in srgb,var(--mau) 24%,#fff);margin-bottom:8px}
.o b{font-weight:900;line-height:1.15;text-align:center}
.o small.vn{color:#8a7a66;opacity:1}
/* Trang chủ: bé rồng dẫn đường + 5 cửa lớn */
.dau-chu{display:flex;align-items:center;gap:12px;flex:none;position:relative;z-index:1;min-height:clamp(84px,15vh,130px)}
.linh-vat{display:flex;align-items:center;gap:4px;flex:none;padding:0}
.rong-lv{width:clamp(92px,13vw,150px);height:auto;aspect-ratio:160/124;animation:nhun 2.4s ease-in-out infinite;filter:drop-shadow(0 6px 4px rgba(0,0,0,.08))}
.bong-noi{background:#fff;border-radius:20px;padding:8px 14px;font-weight:900;font-size:clamp(16px,2.3vw,22px);box-shadow:var(--bong);position:relative;white-space:nowrap}
.bong-noi::before{content:"";position:absolute;left:-9px;top:50%;margin-top:-9px;border-style:solid;border-width:9px 10px 9px 0;border-color:transparent #fff transparent transparent}
.ten-nha{flex:1;text-align:center;margin:0;font-size:clamp(26px,5vw,50px);font-weight:900;line-height:1.1}
.dau-chu .dem-sao{flex:none;font-size:clamp(18px,2.5vw,24px);font-weight:900;background:#fff;border-radius:999px;padding:8px 14px;box-shadow:var(--bong)}
#trangchu .luoi-chu{grid-template-columns:repeat(5,1fr);gap:clamp(12px,2vw,22px);align-content:start;align-content:safe center;position:relative;z-index:1;padding-bottom:48px}
#trangchu .o{min-height:clamp(210px,50vh,340px)}
#trangchu .o .bieu{font-size:clamp(64px,8.5vw,110px)}
#trangchu .o b{font-size:clamp(20px,2.5vw,30px)}
#trangchu .co-to{width:1.5em;height:.75em}
.bay{opacity:.6}
/* Danh sách trò chơi: 3 kệ có tên (chạm tên kệ để nghe) */
.ke-tro{padding-top:4px}
.ke-ten{display:inline-flex;align-items:center;gap:8px;font-size:clamp(20px,2.8vw,26px);font-weight:900;margin:16px 4px 10px;padding:6px 18px 6px 10px;background:#fff;border-radius:999px;box-shadow:var(--bong)}
.ke-ten:first-child{margin-top:2px}
.ke-ten span{font-size:1.3em}
.ke-tro .luoi-tc{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px}
.ke-tro .o{min-height:168px}
.ke-tro .o .bieu{font-size:clamp(54px,7vw,72px)}
.ke-tro .o b{font-size:clamp(17px,2.2vw,21px)}
@media (max-width:900px){
  #trangchu .luoi-chu{grid-template-columns:repeat(2,1fr)}
  #trangchu .o{min-height:clamp(150px,23vh,230px)}
  #trangchu .luoi-chu .o:last-child{grid-column:1/-1}
}
@media (max-width:640px){
  .dau-chu{gap:6px}
  .bong-noi{display:none}
  .rong-lv{width:84px}
  .ten-nha{font-size:26px}
  .ke-tro .luoi-tc{grid-template-columns:repeat(2,1fr);gap:12px}
  .ke-tro .o{min-height:140px}
}/* tinh chỉnh bản 12 */
#trangchu .o .bieu{font-size:clamp(72px,10vw,130px)}
.o.nho{min-height:180px}
.o .bieu{min-height:92px}
.o.nho b{min-height:2.3em;display:flex;align-items:center;justify-content:center}
.ke-tro .o b{min-height:2.3em}
@media (max-width:900px){ #trangchu .o .bieu{font-size:clamp(64px,15vw,110px)} }
@media (max-width:640px){ .o.nho{min-height:150px} .o .bieu{min-height:76px} }
/* ===== Máy bay (17/10) ===== */
.khung-mb{display:flex;flex-direction:column;gap:8px;overflow:hidden;padding-bottom:12px}
.bau-troi{position:relative;flex:1;min-height:0;border-radius:28px;overflow:hidden;background:linear-gradient(#74c0fc,#a5d8ff 60%,#d0ebff);touch-action:none;cursor:pointer;box-shadow:var(--bong)}
.mb-doi{position:absolute;left:-5%;right:-5%;bottom:-40px;height:110px;border-radius:50% 50% 0 0;background:#8ce99a;box-shadow:0 -14px 0 #69db7c inset}
#mbvat{position:absolute;inset:0}
.mb-sao,.mb-may-nen{position:absolute;left:0;top:0;line-height:1;pointer-events:none;will-change:transform}
.mb-sao{font-size:clamp(44px,7vmin,64px);filter:drop-shadow(0 0 8px #fff59d)}
.mb-may-nen{opacity:.95}
.mb-may{position:absolute;left:0;top:0;font-size:clamp(70px,13vmin,120px);line-height:1;z-index:2;will-change:transform;pointer-events:none}
.mb-rong{width:1.3em;height:auto;aspect-ratio:160/124;display:block}
.mb-rong-nho{width:46px;height:36px;display:block}
.mb-dem{position:absolute;right:14px;top:12px;background:#fff;border-radius:999px;padding:6px 14px;font-weight:900;font-size:clamp(20px,3vw,28px);box-shadow:var(--bong);z-index:3}
/* ===== ABC tiếng Anh (17/10) — cùng kiểu thẻ với chữ cái tiếng Việt nhưng màn riêng ===== */
#khungabc[data-che=hoc] #vungabc,#khungabc[data-che=tim] #luoiabc{display:none}
.chu-xem-en{background:rgba(231,245,255,.95)}
.chu-bieu{font-family:"Nunito","Segoe UI",Arial,sans-serif;font-weight:900;font-size:.8em;line-height:1;color:#d6336c;letter-spacing:2px}

/* ===== Đàn vui: chọn bài + phím sáng gợi ý (17/10) ===== */
.chon-bai{flex:none;margin-bottom:8px}
.phim small{font-size:clamp(13px,1.8vw,18px);font-weight:900;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.35);margin-top:4px}
.phim.goi{animation:goi-phim .7s ease-in-out infinite;outline:6px solid #fff3bf;outline-offset:-6px}
@keyframes goi-phim{50%{filter:brightness(1.35);transform:translateY(-6px)}}.phim{position:relative}
.phim.goi::after{content:"👆";position:absolute;top:18px;left:50%;margin-left:-.5em;font-size:clamp(34px,5vw,56px);line-height:1;animation:tay-goi .7s ease-in-out infinite}
@keyframes tay-goi{50%{transform:translateY(14px)}}

/* ===== Vuốt mép trái để quay lại (21/10) ===== */
#mepve{position:fixed;left:0;top:0;bottom:0;width:calc(24px + env(safe-area-inset-left));z-index:90;touch-action:none}
#muive{position:fixed;left:0;top:50%;width:56px;height:56px;margin-left:env(safe-area-inset-left);border-radius:50%;background:#fff;color:#adb5bd;box-shadow:0 4px 14px rgba(0,0,0,.25);display:none;align-items:center;justify-content:center;font-size:44px;font-weight:900;line-height:1;padding-bottom:6px;z-index:91;pointer-events:none;transform:translate(-60px,-50%)}
#muive.hien{display:flex}
#muive.qua{background:var(--vang);color:var(--chu)}

/* ===== Xoay xoay (21/10, tro3.js): Chong chóng, Vòng quay, Con quay, Vẽ xoay ===== */
.khung-xoay{display:flex;flex-direction:column;gap:8px;overflow:hidden;padding-bottom:12px}
.san-xoay{position:relative;flex:1;min-height:0;border-radius:28px;background:linear-gradient(#c5f6fa,#e3fafc);box-shadow:var(--bong);touch-action:none;overflow:hidden}
.san-xoay>svg{position:absolute;inset:8px;width:calc(100% - 16px);height:calc(100% - 16px)}
.cc-nho{width:44px;height:44px;display:block}
.nut-gio{background:linear-gradient(#a5d8ff,#4dabf7);box-shadow:0 6px 0 #1c7ed6}
.nut-gio:active{box-shadow:0 2px 0 #1c7ed6}
.vq-san{background:linear-gradient(#fff3bf,#ffe8cc)}
.vq-nut{position:absolute;left:50%;top:51%;width:clamp(84px,15vmin,130px);height:clamp(84px,15vmin,130px);margin:calc(clamp(84px,15vmin,130px)/-2) 0 0 calc(clamp(84px,15vmin,130px)/-2);border-radius:50%;background:linear-gradient(#ff8787,#e03131);color:#fff;font-weight:900;font-size:clamp(20px,3.6vmin,32px);box-shadow:0 6px 0 #a61e4d;border:5px solid #fff;z-index:2}
.vq-nut:active{transform:translateY(4px);box-shadow:0 2px 0 #a61e4d}
.vq-nut.tat{filter:grayscale(.6) opacity(.7);pointer-events:none}
.vq-hien{position:absolute;inset:0;margin:auto;width:fit-content;height:fit-content;display:none;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-width:clamp(170px,38vmin,300px);min-height:clamp(170px,38vmin,300px);padding:16px;border-radius:40px;background:#fff;box-shadow:0 10px 0 rgba(0,0,0,.15),0 0 0 8px #ffd43b;z-index:3}
.vq-hien.hien{display:flex}
.vq-hien span{font-size:clamp(90px,22vmin,170px);line-height:1}
.vq-hien b{font-size:clamp(90px,22vmin,170px);line-height:1;font-weight:900;color:#e8590c}
.vq-hien small{font-size:clamp(22px,4.5vmin,36px);max-width:7em;text-align:center;line-height:1.2}
.vq-o-mau{display:block;width:clamp(120px,28vmin,220px);height:clamp(120px,28vmin,220px);border-radius:50%;box-shadow:inset 0 -10px 0 rgba(0,0,0,.15)}
.cq-ban{position:relative;flex:1;min-height:0;border-radius:28px;overflow:hidden;touch-action:none;background:radial-gradient(circle at 50% 40%,#ffe8cc,#f4c58e 70%,#e8a965);box-shadow:var(--bong),inset 0 0 0 10px #c0875a}
.cq{position:absolute;left:0;top:0;will-change:transform;pointer-events:none}
.cq-bong{position:absolute;inset:8% 0 -8% 8%;border-radius:50%;background:rgba(80,40,10,.25);filter:blur(4px)}
.cq-nghieng{position:absolute;inset:0;transition:transform .12s}
.cq.do .cq-nghieng{transition:transform .35s cubic-bezier(.3,1.5,.6,1)}
.cq-mat{position:absolute;inset:0;border-radius:50%;box-shadow:inset 0 0 0 5px rgba(255,255,255,.7),0 3px 0 rgba(0,0,0,.2);will-change:transform}
.cq-num{position:absolute;left:40%;top:40%;width:20%;height:20%;border-radius:50%;background:radial-gradient(circle at 35% 35%,#fff,#adb5bd 70%);box-shadow:0 2px 3px rgba(0,0,0,.35)}
.cq.do .cq-nghieng{transform:rotate(-24deg) scale(1,.62) translateY(14%)!important;filter:saturate(.75)}
.vx-canh{flex:1;min-height:0;width:100%;touch-action:none;cursor:crosshair}
.vx-toc{width:60px;height:60px;font-size:32px}
@media (max-width:640px){ .vq-nut{top:52%} .hopbut .but{width:50px;height:50px} }

/* ===== Kệ Máy bay (31/10, tro4.js): Sân bay, Nhảy dù (Lắp máy bay, Trên trời có gì? bỏ 01/11) ===== */
.khung-mb2{display:flex;flex-direction:column;gap:8px;overflow:hidden;padding-bottom:12px}
.sb-san{position:relative;flex:1;min-height:0;border-radius:28px;overflow:hidden;touch-action:none;cursor:pointer;background:linear-gradient(#74c0fc,#a5d8ff 55%,#d0ebff);box-shadow:var(--bong)}
#sbmaynen,#sbkhach,#ndlop{position:absolute;inset:0;pointer-events:none}
.sb-may-nen{position:absolute;left:0;top:0;line-height:1;opacity:.95;will-change:transform}
.sb-dat{position:absolute;left:0;right:0;bottom:0;height:24%;background:#8ce99a;border-top:6px solid #69db7c;transition:transform 1s ease}
.sb-duong{position:absolute;left:0;right:0;top:8%;height:46%;background:#5c636a repeating-linear-gradient(90deg,transparent 0 30px,#fff 30px 70px,transparent 70px 100px) center/100% 6px no-repeat}
.sb-nha{position:absolute;right:4%;bottom:100%;font-size:clamp(50px,10vmin,90px);line-height:1}
.sb-cay{position:absolute;right:20%;bottom:100%;font-size:clamp(36px,7vmin,64px);line-height:1}
.tren-troi .sb-dat{transform:translateY(115%)}
.sb-may{position:absolute;left:0;top:0;z-index:2;will-change:transform;transform-origin:50% 60%;pointer-events:none}
.sb-may svg,.nd-may svg{width:100%;height:100%;display:block;overflow:visible}
.sb-may.cho svg{animation:sb-goi 1.4s ease-in-out infinite}
@keyframes sb-goi{50%{transform:scale(1.07);filter:drop-shadow(0 0 14px #fff59d)}}
.sb-khach{position:absolute;font-size:clamp(40px,7vmin,64px);line-height:1;transform:scale(.3);opacity:0;transition:transform .8s cubic-bezier(.3,1.4,.6,1),opacity .3s;z-index:3;translate:-50% -100%}
.nd-co{position:absolute;left:0;right:0;bottom:0;height:16%;background:#8ce99a;border-top:6px solid #69db7c}
.nd-may{position:absolute;left:0;top:0;z-index:2;pointer-events:none;will-change:transform}
.nd-may .mb-quat{animation:mb-quat .12s linear infinite;transform-origin:392px 104px}
@keyframes mb-quat{50%{transform:scaleY(.12)}}
.nd-nguoi{position:absolute;left:0;top:0;width:clamp(100px,20vmin,170px);display:flex;flex-direction:column;align-items:center;translate:-50% -100%;will-change:transform;z-index:3}
.nd-du{width:100%;height:auto;transform:scale(.2,.15);transform-origin:50% 100%;transition:transform .35s cubic-bezier(.3,1.5,.6,1)}
.nd-nguoi.mo .nd-du{transform:none}
.nd-nguoi.dat .nd-du{transform:scale(1.1,.12);opacity:0;transition:transform .4s,opacity .6s .3s}
.nd-nguoi span{font-size:clamp(40px,8vmin,66px);line-height:1;margin-top:-10px}
.nd-nguoi.mat{opacity:0;transition:opacity .5s}
/* 01/11: rồng trang chủ do JS điều khiển (lượn tự do, app.js) — tắt đường bay ngang cố định của CSS */
#trangchu .rong-nen .bay{animation:none!important;top:0!important;left:0!important}
/* 01/11: thêm rồng b9–b16 (tổng 16), cỡ khác nhau, nhún lệch nhịp */
.bay.b9{width:clamp(58px,8.5vw,95px)}.bay.b10{width:clamp(48px,6.5vw,75px)}.bay.b11{width:clamp(66px,10vw,112px)}.bay.b12{width:clamp(52px,7.5vw,85px)}
.bay.b13{width:clamp(62px,9vw,100px)}.bay.b14{width:clamp(46px,6vw,70px)}.bay.b15{width:clamp(56px,8vw,92px)}.bay.b16{width:clamp(70px,11vw,120px)}
.bay.b9 .nhun{animation-delay:-.5s;animation-duration:2s}.bay.b10 .nhun{animation-delay:-1.1s;animation-duration:1.7s}.bay.b11 .nhun{animation-delay:-.3s;animation-duration:2.5s}.bay.b12 .nhun{animation-delay:-1.5s}
.bay.b13 .nhun{animation-delay:-.8s;animation-duration:2.3s}.bay.b14 .nhun{animation-delay:-1.9s;animation-duration:1.6s}.bay.b15 .nhun{animation-delay:-.6s;animation-duration:2.8s}.bay.b16 .nhun{animation-delay:-1.2s;animation-duration:2.4s}
@media (max-width:640px){ .bay.b9,.bay.b11,.bay.b13,.bay.b15,.bay.b16{width:54px}.bay.b10,.bay.b12,.bay.b14{width:44px} }
/* 01/11: trang chủ còn 4 ô (Nghe nhạc gộp vào Xem học) */
#trangchu .luoi-chu{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){ #trangchu .luoi-chu{grid-template-columns:repeat(2,1fr)} #trangchu .luoi-chu .o:last-child{grid-column:auto} }
/* 01/11: thêm rồng b17–b24 (tổng 24) */
.bay.b17{width:clamp(54px,7.5vw,88px)}.bay.b18{width:clamp(44px,6vw,68px)}.bay.b19{width:clamp(60px,9vw,100px)}.bay.b20{width:clamp(50px,7vw,80px)}
.bay.b21{width:clamp(64px,9.5vw,108px)}.bay.b22{width:clamp(46px,6.5vw,74px)}.bay.b23{width:clamp(58px,8.5vw,96px)}.bay.b24{width:clamp(48px,6.5vw,76px)}
.bay.b17 .nhun{animation-delay:-.4s;animation-duration:1.9s}.bay.b18 .nhun{animation-delay:-1.3s;animation-duration:1.7s}.bay.b19 .nhun{animation-delay:-.9s;animation-duration:2.4s}.bay.b20 .nhun{animation-delay:-1.6s;animation-duration:2.1s}
.bay.b21 .nhun{animation-delay:-.2s;animation-duration:2.6s}.bay.b22 .nhun{animation-delay:-1.1s;animation-duration:1.8s}.bay.b23 .nhun{animation-delay:-.7s;animation-duration:2.2s}.bay.b24 .nhun{animation-delay:-1.8s;animation-duration:2s}
@media (max-width:640px){ .bay.b17,.bay.b19,.bay.b21,.bay.b23{width:50px}.bay.b18,.bay.b20,.bay.b22,.bay.b24{width:42px} }
/* Hình vẽ con vật thay emoji chỉ có đầu (thu/*.svg), cao bằng 1 emoji */
.thu-ve{display:inline-block;width:1.2em;height:1em;vertical-align:-.12em;object-fit:contain;pointer-events:none}