/* Vui học tiếng Việt – bản số hoá tương tác (CVCEC) */
@font-face{font-family:"Andika";font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/andika-vietnamese-400-normal.woff2) format("woff2");
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Andika";font-style:normal;font-weight:400;font-display:swap;
  src:url(../fonts/andika-latin-400-normal.woff2) format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Andika";font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/andika-vietnamese-700-normal.woff2) format("woff2");
  unicode-range:U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB}
@font-face{font-family:"Andika";font-style:normal;font-weight:700;font-display:swap;
  src:url(../fonts/andika-latin-700-normal.woff2) format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  color-scheme: light;
  --paper:#F4F0EA; --card:#FFFDF9; --ink:#3A3B3C; --ink-2:#5E5A55; --line:#E4DBCF;
  --straw:#DDAA55; --wood:#C68B59; --wood-d:#8F5E36;
  --green:#5E9E6E; --green-bg:#E6F1E4; --peach:#F4B79B; --peach-bg:#FCE9E0; --pink:#E8738E;
  /* màu các phần theo sách */
  --tn:#3E9B5F; --tn-bg:#E5F3E8;      /* Từ ngữ */
  --ht:#E0577A; --ht-bg:#FDE8EE;      /* Hội thoại */
  --tvv:#3C78C8; --tvv-bg:#E5EFFB;    /* Tiếng Việt vui */
  --hc:#8A5CC2; --hc-bg:#F0E8FA;      /* Học chữ */
  --ld:#D9822B; --ld-bg:#FCEEDD;      /* Luyện đọc (Q2) */
  --lv:#C2457A; --lv-bg:#FBE6EF;      /* Luyện viết (Q2) */
  --ok:#2F8F55; --ok-bg:#DFF3E5; --no:#C9573B; --no-bg:#FBE4DC;
  --r:18px; --r-sm:12px;
  --shadow:0 1px 2px rgba(58,59,60,.06),0 6px 18px rgba(58,59,60,.07);
  --font:"Andika","Roboto",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:18px;line-height:1.5;
  -webkit-tap-highlight-color:transparent}
img{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:var(--wood-d)}
.wrap{max-width:920px;margin:0 auto;padding:0 16px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Header ---------- */
.top{position:sticky;top:0;z-index:30;background:rgba(244,240,234,.94);backdrop-filter:saturate(1.2) blur(8px);
  -webkit-backdrop-filter:saturate(1.2) blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:12px;min-height:62px}
.brand{display:flex;flex-direction:column;line-height:1.05;text-decoration:none;color:var(--ink);font-weight:700;letter-spacing:.01em}
.brand b{font-size:17px}
.brand span{font-size:17px;color:var(--wood)}
.top .crumb{margin-left:auto;display:flex;gap:8px;align-items:center;min-width:0}
.pill{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:999px;background:var(--card);
  border:1px solid var(--line);text-decoration:none;color:var(--ink);font-size:15px;font-weight:700;white-space:nowrap}
.pill svg{width:18px;height:18px}
@media (max-width:520px){ .top .crumb .hide-s{display:none} }

/* ---------- Icons & buttons ---------- */
.ico{width:22px;height:22px;flex:none}
.btn{text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 18px;border-radius:999px;
  border:2px solid transparent;background:var(--ink);color:#fff;font-weight:700;font-size:17px;cursor:pointer;touch-action:manipulation;
  transition:transform .08s ease, background .15s}
.btn:active{transform:scale(.97)}
.btn.soft{background:var(--card);color:var(--ink);border-color:var(--line)}
.btn.wood{background:var(--wood);color:#fff}
.btn.green{background:var(--green);color:#fff}
.btn.rec{background:#D9534F;color:#fff}
.btn.small{min-height:40px;padding:6px 14px;font-size:15px}
.btn[disabled]{opacity:.45;pointer-events:none}
.btn.playing{box-shadow:0 0 0 4px rgba(221,170,85,.45)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* ---------- Lesson hero & tabs ---------- */
.hero{padding:22px 0 8px}
.hero .lbl{display:inline-block;background:var(--pink);color:#fff;font-weight:700;border-radius:10px;padding:2px 12px;font-size:16px}
.hero h1{margin:6px 0 2px;font-size:clamp(28px,6vw,40px);line-height:1.15}
.hero p{margin:0;color:var(--ink-2);font-size:16px}
.tabs{display:flex;gap:8px;overflow-x:auto;padding:12px 0 14px;scrollbar-width:none;position:sticky;top:62px;z-index:20;background:var(--paper)}
.tabs::-webkit-scrollbar{display:none}
.tab{flex:none;display:flex;align-items:center;gap:8px;padding:9px 16px;border-radius:999px;border:2px solid var(--line);background:var(--card);
  font-weight:700;font-size:16px;cursor:pointer;white-space:nowrap;touch-action:manipulation}
.tab .dot{width:10px;height:10px;border-radius:50%;background:var(--c)}
.tab .st{font-size:13px;color:var(--ink-2);font-weight:700}
.tab[aria-selected="true"]{background:var(--c);border-color:var(--c);color:#fff}
.tab[aria-selected="true"] .dot{background:#fff}
.tab[aria-selected="true"] .st{color:#fff}

/* ---------- Section ---------- */
.sec{display:none;padding-bottom:28px}
.sec.on{display:block}
.sec-head{display:flex;align-items:center;gap:12px;margin:6px 0 14px;flex-wrap:wrap}
.banner{font-weight:700;font-size:22px;color:#fff;background:var(--c);padding:6px 20px;border-radius:12px;letter-spacing:.03em;text-transform:uppercase}
.sec-head .btn{margin-left:auto}

.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;margin-bottom:18px;border:1px solid #EFE7DC}
.card-h{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.num{flex:none;width:34px;height:34px;border-radius:50%;background:var(--c);color:#fff;font-weight:700;display:grid;place-items:center}
.card-h h3{margin:0;font-size:19px;line-height:1.3}
.card-h .star{margin-left:auto;flex:none;width:30px;height:30px;color:#E2D8CA}
.card-h .star.got{color:var(--straw);animation:pop .5s ease}
@keyframes pop{0%{transform:scale(.4)}60%{transform:scale(1.25)}100%{transform:scale(1)}}
.hint{color:var(--ink-2);font-size:16px;margin:0 0 12px}
.lenh{flex:none;border:0;background:#F1EBE2;color:var(--wood-d);width:40px;height:40px;border-radius:50%;display:inline-grid;place-items:center;cursor:pointer;vertical-align:middle}
.lenh.playing{background:var(--straw);color:#fff}
.hero h1 .lenh{width:44px;height:44px}
.cap{min-height:44px;margin-top:10px;font-size:clamp(22px,4.6vw,30px);font-weight:700;text-align:center;color:var(--ink)}

/* segmented control inside a card */
.seg{display:inline-flex;background:#F1EBE2;border-radius:999px;padding:4px;margin-bottom:14px;gap:4px;flex-wrap:wrap}
.seg button{border:0;background:transparent;padding:8px 16px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;min-height:40px}
.seg button[aria-pressed="true"]{background:var(--card);box-shadow:0 1px 3px rgba(0,0,0,.12);color:var(--c)}

/* ---------- Scene (picture with hotspots) ---------- */
.scene{position:relative;border-radius:var(--r-sm);overflow:hidden;user-select:none;-webkit-user-select:none;touch-action:manipulation;background:#eee}
.scene img{width:100%;height:auto;pointer-events:none}
.who{position:absolute;border:0;background:transparent;cursor:pointer;border-radius:22px;padding:0}
.who.ring{box-shadow:0 0 0 4px var(--straw) inset, 0 0 0 9999px rgba(0,0,0,.18)}
.who.pulse{animation:pulse 1s ease}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(221,170,85,.9) inset}40%{box-shadow:0 0 0 6px rgba(221,170,85,.9) inset}100%{box-shadow:0 0 0 0 rgba(221,170,85,0) inset}}
.who.good{box-shadow:0 0 0 5px var(--ok) inset}
.who.bad{animation:shake .4s}
.tag{position:absolute;border:0;padding:0;background:transparent;cursor:pointer;border-radius:50%}
.tag.cover{background:#fff;border:3px solid var(--pink);display:grid;place-items:center;font-weight:700;color:var(--pink);font-size:clamp(16px,3.4vw,28px)}
.tag.cover.reveal{color:var(--ink)}
.tag.pulse{animation:tagpulse .8s ease}
@keyframes tagpulse{50%{transform:scale(1.15)}}
@keyframes shake{20%{transform:translateX(-6px)}40%{transform:translateX(6px)}60%{transform:translateX(-4px)}80%{transform:translateX(4px)}}

/* ---------- Model box (M) ---------- */
.model{display:flex;gap:14px;align-items:flex-end;margin-top:14px}
.model .who-img{width:min(130px,30%);flex:none}
.model .lines{flex:1;min-width:0;border:3px dotted var(--c);border-radius:16px;padding:12px 14px 12px 46px;position:relative;background:#fff}
.model .lines .m{position:absolute;left:10px;top:10px;width:28px;height:28px;border-radius:50%;border:2px solid var(--ink);display:grid;place-items:center;font-weight:700;font-size:15px}
.line{display:flex;align-items:center;gap:8px;width:100%;text-align:left;border:0;background:transparent;padding:6px 8px;border-radius:10px;
  font-size:20px;cursor:pointer;min-height:44px}
.line:hover{background:#F7F2EA}
.line.quiet{cursor:default;padding-left:36px}.line.quiet:hover{background:transparent}
@media (max-width:520px){.model{gap:8px}.model .who-img{width:76px}.model .lines{padding:10px 8px 10px 40px}.line{font-size:18px;padding:5px 4px}}
.line.on{background:#FFF1D6}
.line .ico{color:var(--wood);width:20px;height:20px}
.mrow{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}

/* ---------- Game bits ---------- */
.game-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.dots{display:flex;gap:6px;margin-left:auto}
.dots i{width:12px;height:12px;border-radius:50%;background:#E6DDD0}
.dots i.done{background:var(--ok)}
.fb{min-height:34px;font-weight:700;font-size:18px;margin:10px 0 0;display:flex;align-items:center;gap:8px}
.fb.ok{color:var(--ok)} .fb.no{color:var(--no)}
.done-box{text-align:center;padding:18px;border-radius:16px;background:var(--ok-bg);margin-top:12px}
.done-box b{display:block;font-size:22px;color:var(--ok)}

/* sentence frame */
.say{font-size:clamp(24px,5vw,34px);font-weight:700;background:#FFF7E6;border:2px dashed var(--straw);border-radius:16px;padding:12px 18px;margin:14px 0 10px;min-height:66px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.say em{font-style:normal;color:var(--c);text-decoration:underline;text-decoration-thickness:3px;text-underline-offset:6px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:2px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;font-weight:700;font-size:16px;display:inline-flex;gap:6px;align-items:center}
.chip.done{border-color:var(--ok);background:var(--ok-bg);color:var(--ok)}

/* role play */
.duo{display:grid;grid-template-columns:1fr;gap:10px;margin:12px 0}
.bub{display:flex;gap:10px;align-items:center}
.bub img{width:58px;height:58px;border-radius:50%;object-fit:cover;object-position:center 45%;border:3px solid #fff;box-shadow:var(--shadow);flex:none}
.bub .t{background:#E8F0FB;border-radius:18px;padding:10px 16px;font-size:21px;font-weight:700;min-height:48px;display:flex;align-items:center}
.bub.r{flex-direction:row-reverse}
.bub.r .t{background:var(--ht-bg)}
.bub .t.wait{color:#B7AC9E;font-weight:400}
.opts{display:grid;grid-template-columns:1fr;gap:10px;margin-top:8px}
@media (min-width:640px){.opts{grid-template-columns:repeat(3,1fr)}}
.opt{border:2px solid var(--line);background:#fff;border-radius:16px;padding:12px 14px;font-size:20px;font-weight:700;min-height:56px;cursor:pointer;touch-action:manipulation}
.opt.good{border-color:var(--ok);background:var(--ok-bg);color:var(--ok)}
.opt.bad{border-color:var(--no);background:var(--no-bg);animation:shake .4s}

/* stickers */
.stage{position:relative;border-radius:var(--r-sm);overflow:hidden;background:#EEE;touch-action:manipulation;user-select:none;-webkit-user-select:none}
.stage img{width:100%;height:auto;pointer-events:none}
.stage.placing{outline:4px dashed var(--straw);outline-offset:-4px;cursor:crosshair}
.stk{position:absolute;transform:translate(-50%,-50%);background:#fff;border:3px solid var(--pink);border-radius:999px;padding:4px 14px;font-weight:700;
  font-size:clamp(16px,3.2vw,24px);box-shadow:0 3px 10px rgba(0,0,0,.18);cursor:grab;touch-action:none;white-space:nowrap}
.stk .x{margin-left:6px;border:0;background:#F3E5E9;color:var(--pink);border-radius:50%;width:22px;height:22px;font-size:14px;line-height:22px;padding:0;cursor:pointer;vertical-align:middle}
.tray{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}
.tray button{border:2px solid var(--pink);background:#fff;border-radius:999px;padding:6px 16px;font-weight:700;font-size:18px;min-height:44px;cursor:pointer}
.tray button[aria-pressed="true"]{background:var(--pink);color:#fff}
.sents{margin:8px 0 0;padding-left:0;list-style:none}
.sents li{font-size:20px;font-weight:700;padding:4px 0}
.privacy{font-size:14px;color:var(--ink-2);background:var(--green-bg);border-radius:12px;padding:8px 12px;margin-top:10px}

/* song */
.song{position:relative;border-radius:var(--r-sm);overflow:hidden;background:linear-gradient(135deg,#2F4858,#3C78C8);aspect-ratio:16/9;display:grid;place-items:center;color:#fff;cursor:pointer;border:0;width:100%}
.song .play{width:84px;height:84px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center;color:#C4302B}
.song .play svg{width:40px;height:40px;margin-left:5px}
.song .cap{position:absolute;left:16px;bottom:12px;right:16px;text-align:left;font-size:16px;opacity:.95}
.song iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* letters */
.lchips{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin:6px 0 10px}
.lchip{border:0;background:#FFE9A8;border-radius:22px;padding:8px 22px;font-size:26px;font-weight:700;min-height:56px;cursor:pointer;box-shadow:0 2px 0 #E9C766}
.hollow{color:transparent;-webkit-text-stroke:2px var(--ink);paint-order:stroke fill;transition:color .2s}
.bigl{display:flex;gap:clamp(18px,6vw,60px);justify-content:center;margin:10px 0}
.bigl button{border:0;background:transparent;font-size:clamp(84px,20vw,140px);line-height:1.1;font-weight:700;cursor:pointer;padding:0 6px;touch-action:manipulation}
.crayons{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:4px 0 12px}
.crayon{width:44px;height:44px;border-radius:50%;border:3px solid #fff;box-shadow:0 0 0 2px var(--line);cursor:pointer;padding:0}
.crayon[aria-pressed="true"]{box-shadow:0 0 0 3px var(--ink);transform:scale(1.08)}
.sentbox{border:3px solid var(--c);border-radius:14px;padding:6px 10px;margin:10px 0;display:flex;flex-wrap:wrap;column-gap:.42em;row-gap:0;
  background:#fff;font-size:clamp(40px,9vw,64px);font-weight:700;line-height:1.25}
.sentbox .w{display:inline-flex}
.sentbox .g{border:0;background:transparent;padding:0 1px;font-size:inherit;font-weight:inherit;line-height:inherit;cursor:pointer;touch-action:manipulation}
.sentbox .g.p{cursor:default}
.sentbox .g.bad{animation:shake .4s}
.count{font-weight:700;color:var(--ink-2)}
@media (max-width:440px){.crayon{width:38px;height:38px}.crayons{gap:7px}.crayons b{width:100%}.sentbox{font-size:clamp(32px,9vw,40px)}}

/* recorder */
.recbox{margin-top:14px;padding:12px 14px;border-radius:14px;background:#F7F2EA;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.recbox .lab{font-weight:700;font-size:16px;margin-right:auto;display:flex;align-items:center;gap:8px}
.recbox .tm{font-variant-numeric:tabular-nums;font-weight:700;color:#D9534F}
.recdot{width:12px;height:12px;border-radius:50%;background:#D9534F;animation:blink 1s infinite}
@keyframes blink{50%{opacity:.25}}

/* lesson footer nav */
.next{display:flex;justify-content:space-between;gap:10px;margin:8px 0 30px;flex-wrap:wrap}
.finish{text-align:center;background:var(--card);border-radius:var(--r);padding:26px 18px;box-shadow:var(--shadow);margin-bottom:24px}
.finish .stars{font-size:22px;font-weight:700;color:var(--wood-d)}

/* lightbox */
.lb{position:fixed;inset:0;background:rgba(30,28,26,.86);z-index:100;display:none;flex-direction:column}
.lb.on{display:flex}
.lb .bar{display:flex;gap:8px;padding:10px 12px;align-items:center;color:#fff}
.lb .bar b{margin-right:auto}
.lb .pg{flex:1;overflow:auto;padding:0 12px 12px;display:flex;justify-content:center}
.lb .pg img{max-width:min(900px,100%);height:auto;border-radius:6px}

/* toast */
.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%) translateY(20px);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;
  font-weight:700;opacity:0;transition:.25s;z-index:120;pointer-events:none;max-width:calc(100% - 32px);text-align:center}
.toast.on{opacity:1;transform:translateX(-50%) translateY(0)}

/* footer */
.foot{border-top:1px solid var(--line);margin-top:20px;padding:18px 0 30px;font-size:14px;color:var(--ink-2)}
.foot p{margin:4px 0}
.foot .cp{opacity:.75}

/* ---------- Home ---------- */
.home-hero{padding:28px 0 6px}
.home-hero h1{font-size:clamp(34px,8vw,54px);margin:0;line-height:1.05}
.home-hero h1 span{color:var(--pink)}
.home-hero p{font-size:18px;color:var(--ink-2);max-width:640px}
.books{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:18px 0}
.book{border:3px solid transparent;background:var(--card);border-radius:var(--r);padding:16px;text-align:left;cursor:pointer;box-shadow:var(--shadow);min-height:110px}
.book b{display:block;font-size:22px}
.book small{display:block;color:var(--ink-2);font-size:15px;margin-top:4px}
.book[aria-pressed="true"]{border-color:var(--c)}
.book.q1{--c:#4C7BD9} .book.q2{--c:#3E9B5F}
.chap{margin:22px 0 10px;font-size:15px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);display:flex;align-items:center;gap:10px}
.chap::after{content:"";flex:1;height:1px;background:var(--line)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:12px}
.les{display:flex;gap:12px;align-items:center;background:var(--card);border-radius:16px;padding:12px 14px;text-decoration:none;color:var(--ink);
  border:1px solid #EFE7DC;box-shadow:var(--shadow);min-height:76px}
.les .n{flex:none;width:42px;height:42px;border-radius:12px;background:var(--c,#4C7BD9);color:#fff;font-weight:700;display:grid;place-items:center;font-size:18px}
.les .t{font-weight:700;font-size:16px;line-height:1.25}
.les .s{font-size:13px;color:var(--ink-2)}
.les.soon{opacity:.55;box-shadow:none;pointer-events:none}
.les.ont .n{background:var(--wood)}
.guide{background:var(--green-bg);border-radius:var(--r);padding:16px 18px;margin:26px 0 8px}
.guide h2{margin:0 0 8px;font-size:20px}
.guide ul{margin:0;padding-left:20px}
.guide li{margin:4px 0}