/* =========================================================
   NỀN TẢNG TIẾNG ANH — trang đăng ký (v9 · nội dung canh giữa, nút nổi giữa trên điện thoại)
   ========================================================= */
:root{
  --bg:#f6f2ea;
  --ink:#1c2431;
  --ink2:#4b5463;
  --ink3:#8a8f98;
  --line:rgba(28,36,49,.09);
  --card:rgba(255,255,255,.82);
  --coral:#b8613f;   /* đất nung */
  --sun:#b8893a;     /* vàng đồng — màu bìa sách */
  --orange:#a8743f;  /* nâu hổ phách */
  --sky:#46648f;     /* xanh đá */
  --mint:#2f6b55;    /* xanh rêu — màu bìa sách */
  --grape:#5f587f;   /* tím khói */
  --pink:#9c5b67;    /* hồng gụ */
  --teal:#3b7a7d;    /* xanh két trầm */
  --forest:#244f40;
  --r:24px;
  --ease:cubic-bezier(.22,.9,.3,1);
  --maxw:1180px;
  --shadow:0 18px 44px -22px rgba(28,36,49,.28),0 1px 3px rgba(28,36,49,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:clip;scroll-snap-type:y mandatory}
body{
  color:var(--ink);font-family:"Montserrat",system-ui,sans-serif;font-size:16.5px;line-height:1.6;
  -webkit-font-smoothing:antialiased;
  background:var(--bg);
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input{font:inherit;color:inherit}
::selection{background:rgba(184,137,58,.3)}

/* ---------- nền: trời pastel + đốm màu trôi ---------- */
.sky{position:fixed;inset:0;z-index:0;overflow:hidden;
  background:linear-gradient(170deg,#f8f4ec 0%,#f3eee5 45%,#eef0ee 100%)}
.sky i{position:absolute;border-radius:50%;filter:blur(90px);opacity:.28;animation:troi 22s ease-in-out infinite alternate}
.sky i:nth-child(1){width:46vw;height:46vw;left:-10vw;top:-12vw;background:#e3c78f}
.sky i:nth-child(2){width:40vw;height:40vw;right:-8vw;top:10vh;background:#d9b8a8;animation-delay:-6s}
.sky i:nth-child(3){width:44vw;height:44vw;left:20vw;bottom:-20vw;background:#aebfd3;animation-delay:-11s}
.sky i:nth-child(4){width:30vw;height:30vw;right:10vw;bottom:-6vw;background:#b9cfbf;animation-delay:-3s}
@keyframes troi{to{transform:translate(6vw,4vh) scale(1.12)}}
#scene{position:fixed;inset:0;width:100%;height:100%;z-index:1;display:block;pointer-events:none}
main{position:relative;z-index:5}

/* ---------- loader ---------- */
.loader{position:fixed;inset:0;z-index:100;background:#f6f2ea;display:grid;place-items:center;transition:opacity .8s var(--ease),visibility .8s}
.loader.xong{opacity:0;visibility:hidden}
.loader-in{text-align:center;font-weight:700;font-size:12px;letter-spacing:.34em;color:var(--ink2)}
.loader-bar{width:160px;height:5px;background:rgba(31,37,71,.08);margin:14px auto 0;border-radius:5px;overflow:hidden}
.loader-bar i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--mint),var(--sun));transition:width .3s}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;display:flex;align-items:center;gap:18px;padding:12px clamp(16px,3vw,34px);transition:background .4s,box-shadow .4s}
.nav.dac{background:rgba(246,242,234,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 6px 30px -18px rgba(60,50,120,.35)}
.brand{display:flex;align-items:center;gap:10px;font-weight:800}
.brand-mark{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;font-family:"Montserrat",sans-serif;font-weight:700;font-size:20px;color:#e9cf97;
  background:var(--forest);box-shadow:0 6px 14px -6px rgba(36,79,64,.6)}
.brand small{display:block;font-size:10px;font-weight:700;letter-spacing:.22em;color:var(--ink3);line-height:1}
.brand b{display:block;line-height:1.2;font-size:15px;white-space:nowrap}

/* ---------- nút ---------- */
.btn{position:relative;display:inline-flex;align-items:center;gap:10px;border:0;cursor:pointer;border-radius:999px;padding:16px 28px;
  font-weight:700;font-size:16.5px;letter-spacing:.01em;white-space:nowrap;transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.btn svg{width:19px;height:19px;flex:none}
.btn-main{color:#fff;background:linear-gradient(135deg,#2f6b55,var(--forest));
  box-shadow:0 12px 26px -10px rgba(36,79,64,.7),inset 0 1px 0 rgba(255,255,255,.18)}
.btn-main::after{content:"";position:absolute;inset:0;border-radius:inherit;
  background:linear-gradient(110deg,transparent 30%,rgba(255,255,255,.22) 48%,transparent 62%) -150% 0/60% 100% no-repeat;animation:shine 5s var(--ease) infinite}
@keyframes shine{0%,55%{background-position:-150% 0}100%{background-position:250% 0}}
.btn-main:hover{transform:translateY(-2px);box-shadow:0 16px 32px -10px rgba(36,79,64,.8),inset 0 1px 0 rgba(255,255,255,.18)}
.btn-soft{background:#fff;color:var(--ink);box-shadow:var(--shadow)}
.btn-soft:hover{transform:translateY(-3px)}

.fab{position:fixed;right:clamp(14px,5vw,78px);bottom:clamp(14px,3vw,26px);z-index:60;transition:transform .5s var(--ease),opacity .5s}
.fab .btn{padding:15px 22px 15px 18px}
.fab-ring{position:absolute;inset:-5px;border-radius:999px;border:2px solid rgba(47,107,85,.35);animation:ring 2.2s var(--ease) infinite;pointer-events:none}
@keyframes ring{0%{transform:scale(.95);opacity:.9}100%{transform:scale(1.2);opacity:0}}
.fab.an{transform:translateY(150%);opacity:0;pointer-events:none}

/* ---------- trục dọc bên phải ---------- */
.truc{position:fixed;right:clamp(12px,1.8vw,28px);top:50%;transform:translateY(-50%);z-index:55;display:flex;flex-direction:column;gap:0;align-items:center;width:24px}
.truc::before{content:"";position:absolute;left:50%;top:14px;bottom:14px;width:2px;margin-left:-1px;border-radius:2px;background:rgba(28,36,49,.12)}
.truc .chay{position:absolute;left:50%;top:14px;width:2px;margin-left:-1px;border-radius:2px;height:0;background:linear-gradient(var(--sun),var(--mint));transition:height .6s var(--ease)}
.truc button{position:relative;display:grid;place-items:center;width:24px;height:28px;border:0;background:none;cursor:pointer;padding:0}
.truc button i{width:11px;height:11px;border-radius:50%;background:#fff;border:2px solid rgba(28,36,49,.3);transition:.4s var(--ease);position:relative;z-index:1}
.truc button span{position:absolute;right:30px;top:50%;font-size:12px;font-weight:700;color:var(--ink2);background:#fff;padding:3px 10px;border-radius:999px;box-shadow:var(--shadow);
  opacity:0;transform:translate(6px,-50%);transition:.3s var(--ease);white-space:nowrap;pointer-events:none}
.truc button:hover span,.truc button.on span{opacity:1;transform:translate(0,-50%)}
.truc button.on span{color:#fff;background:var(--ink)}
.truc button.on i{border-color:var(--sun);background:var(--sun);transform:scale(1.35);box-shadow:0 0 0 4px rgba(184,137,58,.2)}
.truc button.qua i{border-color:var(--mint);background:var(--mint)}
@media (max-width:700px){section{padding-left:30px;padding-right:30px}.truc button span{display:none}.truc{right:4px;width:20px}.truc button{width:20px;height:22px}.truc button i{width:9px;height:9px}.truc::before{top:11px;bottom:11px}}

/* ---------- màn (section) ---------- */
section{position:relative;min-height:100vh;min-height:100svh;scroll-snap-align:start;scroll-snap-stop:always;
  display:flex;align-items:center;padding:86px clamp(44px,5.5vw,96px) 40px}
.wrap{max-width:var(--maxw);margin:0 auto;width:100%}
.nhan{display:inline-flex;align-items:center;gap:10px;font-size:12px;font-weight:700;letter-spacing:.26em;text-transform:uppercase;color:var(--sun)}
.nhan::before,.center .nhan::after{content:"";width:26px;height:1px;background:currentColor;opacity:.6}
h2.tt{font-family:"Montserrat",system-ui,sans-serif;font-size:clamp(30px,4vw,52px);line-height:1.15;font-weight:700;letter-spacing:-.02em;margin:14px 0 10px}
.phu{font-size:clamp(16px,1.4vw,19px);color:var(--ink2);max-width:620px}
.center{text-align:center}.center .phu{margin:0 auto}
.to{color:var(--sun)}
.to-b{color:var(--sky)}
.to-g{color:var(--mint)}
.the{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);border:1px solid rgba(255,255,255,.9);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}

.rv{opacity:0;transform:translateY(34px) scale(.98);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.rv.in{opacity:1;transform:none}
.rv[data-d="1"]{transition-delay:.07s}.rv[data-d="2"]{transition-delay:.14s}.rv[data-d="3"]{transition-delay:.21s}
.rv[data-d="4"]{transition-delay:.28s}.rv[data-d="5"]{transition-delay:.35s}.rv[data-d="6"]{transition-delay:.42s}
.rv[data-d="7"]{transition-delay:.49s}.rv[data-d="8"]{transition-delay:.56s}

/* ========== 1 · HERO ========== */
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:30px;align-items:center}
.hero h1{font-family:"Montserrat",system-ui,sans-serif;font-size:clamp(44px,6.2vw,90px);line-height:1.04;font-weight:800;margin:18px 0 14px;letter-spacing:-.03em}
.hero h1 .d2{display:block}
.k10{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:14px;background:#fff;padding:6px 16px 6px 6px;border-radius:999px;box-shadow:var(--shadow)}
.k10 b{background:var(--forest);color:#e9cf97;padding:3px 11px;border-radius:999px;font-size:13px}
.hero .phu{font-size:clamp(17px,1.6vw,21px);margin-bottom:30px}
.hero .phu b{color:var(--ink)}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.bao{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:15px;padding:10px 16px 10px 10px;border-radius:16px;background:#fff;box-shadow:var(--shadow);margin-bottom:22px}
.bao .kh{width:36px;height:36px;border-radius:11px;display:grid;place-items:center;background:#e6efe9;color:var(--mint)}
.bao .kh svg{width:20px;height:20px}
.hero-stage{position:relative;height:min(76vh,700px);touch-action:pan-y;cursor:grab}
.hero-hint{position:absolute;left:0;right:0;bottom:2%;display:flex;justify-content:center;align-items:center;gap:8px;font-size:12.5px;font-weight:700;color:var(--ink3);letter-spacing:.08em}
.hero-hint svg{width:16px;height:16px}
.cuon-xuong{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);display:flex;flex-direction:column;align-items:center;gap:4px;font-size:12px;font-weight:700;color:var(--ink3);cursor:pointer;background:none;border:0}
.cuon-xuong svg{width:22px;height:22px;animation:nhun 1.6s var(--ease) infinite}
@keyframes nhun{50%{transform:translateY(6px)}}
@media (max-width:900px){
  .hero .wrap{grid-template-columns:1fr;gap:0;text-align:center}
  .hero-stage{order:-1;height:40vh;margin-top:-10px}
  .hero-cta{justify-content:center}
  .hero .phu{margin-left:auto;margin-right:auto}
  .cuon-xuong{display:none}
}

/* ========== 2 · CỦA THẦY ========== */
.thay{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(24px,4vw,56px);align-items:center;margin-top:26px}
.thay-anh{position:relative;border-radius:30px;overflow:hidden;aspect-ratio:4/4.6;box-shadow:var(--shadow);border:6px solid #fff}
.thay-anh img{width:100%;height:100%;object-fit:cover;object-position:38% 30%;transform:scale(1.42);transform-origin:38% 42%}
.thay-anh .ten{position:absolute;left:50%;bottom:14px;transform:translateX(-50%);background:#fff;border-radius:999px;padding:6px 16px;box-shadow:var(--shadow);white-space:nowrap}
.thay-anh .ten b{font-family:"Montserrat",sans-serif;font-size:15px;font-weight:700;line-height:1.2;display:block}
.thay-anh .ten span{font-size:12.5px;color:var(--ink3);font-weight:600}
.cua{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.cua .o{grid-column:span 2;padding:18px;border-radius:22px;position:relative;overflow:hidden;transition:transform .45s var(--ease)}
.cua .o:nth-child(4),.cua .o:nth-child(5){grid-column:span 3}
.cua .o:hover{transform:translateY(-5px)}
.cua .ic{width:50px;height:50px;border-radius:14px;display:grid;place-items:center;color:var(--c);margin-bottom:12px;background:color-mix(in srgb,var(--c) 11%,#fff);border:1px solid color-mix(in srgb,var(--c) 22%,#fff)}
.cua .ic svg{width:27px;height:27px}
.cua small{display:block;font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--c)}
.cua b{display:block;font-family:"Montserrat",sans-serif;font-weight:700;font-size:17.5px;line-height:1.2}
.cua .o::after{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--c);opacity:.7}
.dong{margin-top:18px;display:flex;align-items:center;gap:12px;font-weight:700;color:var(--ink2);font-size:16px}
.dong .xich{display:flex}
.dong .xich i{width:14px;height:14px;border-radius:50%;margin-left:-4px;border:2px solid #fff}
@media (max-width:900px){.thay{grid-template-columns:1fr}.thay-anh{display:none}.cua{grid-template-columns:repeat(2,1fr)}.cua .o,.cua .o:nth-child(4){grid-column:span 1}.cua .o:nth-child(5){grid-column:1/-1}}

/* ========== 3 · CON SỐ ========== */
.so-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:34px}
.so{padding:24px 20px;border-radius:26px;text-align:center;position:relative;overflow:hidden}
.so .n{font-family:"Montserrat",sans-serif;font-size:clamp(38px,4.2vw,58px);font-weight:700;letter-spacing:-.02em;line-height:1;color:var(--c);font-variant-numeric:tabular-nums}
.so .d{margin-top:8px;font-weight:600;font-size:14.5px;color:var(--ink3);letter-spacing:.02em}
.so::before{content:"";position:absolute;left:30%;right:30%;bottom:0;height:3px;border-radius:3px;background:var(--c);opacity:.55}
@media (max-width:900px){.so-grid{grid-template-columns:repeat(2,1fr);gap:10px}.so{padding:16px 10px}}

/* ========== 4 · SÁCH ========== */
.sach{display:grid;grid-template-columns:1.25fr .75fr;gap:clamp(20px,4vw,50px);align-items:center;margin-top:10px}
.quat{position:relative;height:min(52vh,470px);perspective:1600px}
.quat .tr{position:absolute;left:50%;top:50%;width:min(15vw,240px);aspect-ratio:692/1000;transform-origin:50% 120%;border-radius:8px;overflow:hidden;cursor:zoom-in;background:#fff;
  box-shadow:0 24px 50px -18px rgba(60,50,120,.5),0 0 0 1px rgba(31,37,71,.06);transition:transform .9s var(--ease),box-shadow .4s,opacity .6s;translate:-50% -50%}
.quat .tr img{width:100%;height:100%;object-fit:cover}
.quat .tr:hover{box-shadow:0 30px 60px -18px rgba(28,36,49,.55),0 0 0 2px var(--sun);z-index:20!important}
.quat-nut{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.quat-nut button{border:0;background:#fff;box-shadow:var(--shadow);border-radius:999px;padding:9px 18px;font-size:14px;font-weight:700;cursor:pointer;color:var(--ink2);transition:.3s}
.quat-nut button.on{color:#fff;background:var(--ink)}
.hs-anh{position:relative;border-radius:26px;overflow:hidden;border:6px solid #fff;box-shadow:var(--shadow);max-height:66vh}
.hs-anh img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:50% 45%}
.nhan-dan{position:absolute;left:16px;top:16px;background:rgba(255,255,255,.92);color:var(--ink);font-weight:700;font-size:12px;letter-spacing:.16em;text-transform:uppercase;padding:7px 14px;border-radius:999px;box-shadow:var(--shadow);z-index:2}
@media (max-width:900px){.sach{grid-template-columns:1fr}.hs-anh{display:none}.quat{height:42vh}.quat .tr{width:36vw}}

/* lightbox */
.lb{position:fixed;inset:0;z-index:90;background:rgba(40,35,70,.55);backdrop-filter:blur(8px);display:grid;place-items:center;opacity:0;visibility:hidden;transition:.4s var(--ease);padding:20px}
.lb.mo{opacity:1;visibility:visible}
.lb img{max-height:88vh;max-width:92vw;border-radius:10px;box-shadow:0 30px 90px rgba(0,0,0,.35);transform:scale(.94);transition:transform .5s var(--ease)}
.lb.mo img{transform:none}

/* ========== 5 · LỘ TRÌNH ========== */
.lt{position:relative;margin-top:26px;display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,26px) clamp(18px,3vw,50px)}
.lt svg.duong{position:absolute;inset:0;width:100%;height:100%;overflow:visible;pointer-events:none;z-index:0}
.lt svg.duong path{fill:none;stroke-width:5;stroke-linecap:round;stroke-dasharray:2 14}
.lt svg.duong path.nen{stroke:rgba(28,36,49,.1)}
.ch{position:relative;z-index:1;display:flex;align-items:center;gap:14px;padding:14px 16px;border-radius:22px;transition:transform .4s var(--ease)}
.ch:hover{transform:translateY(-4px) scale(1.02)}
.ch .sn{flex:none;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;font-family:"Montserrat",sans-serif;font-size:21px;font-weight:600;color:var(--c);background:#fff;border:1.5px solid var(--c)}
.ch .sn svg{width:20px;height:20px}
.ch b{display:block;font-family:"Montserrat",sans-serif;font-weight:700;font-size:16.5px;line-height:1.2}
.ch span{font-size:13.5px;font-weight:600;color:var(--ink3)}
.ch.dich{background:var(--forest);color:#fff}
.ch.dich span{color:#cfe0d6}
.ch.dich .sn{background:transparent;border-color:#e9cf97;color:#e9cf97}
.thi{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:22px}
.thi span{font-weight:600;font-size:14.5px;font-family:"Montserrat",sans-serif;padding:8px 18px;border-radius:999px;background:#fff;box-shadow:var(--shadow);color:var(--c)}
@media (max-width:900px){.lt{grid-template-columns:1fr 1fr;gap:10px}.lt svg.duong{display:none}.ch{padding:10px;gap:10px}.ch .sn{width:40px;height:40px;font-size:19px;border-radius:13px}.ch b{font-size:16px}.thi span{font-size:13px;padding:7px 12px}}

/* ========== 6 · MỘT BÀI HỌC ========== */
.mb{display:grid;grid-template-columns:.75fr 1.25fr;gap:clamp(20px,3.5vw,50px);align-items:center;margin-top:24px}
.buoc-ds{display:grid;gap:8px}
.buoc{display:flex;gap:14px;align-items:center;padding:12px 16px;border-radius:18px;cursor:pointer;border:0;background:transparent;text-align:left;width:100%;position:relative;overflow:hidden;transition:background .4s,box-shadow .4s}
.buoc .sb{flex:none;width:40px;height:40px;border-radius:13px;display:grid;place-items:center;font-weight:800;background:#fff;color:var(--ink3);box-shadow:var(--shadow);transition:.4s}
.buoc b{font-size:16.5px;font-weight:700;line-height:1.3;color:var(--ink2)}
.buoc.on{background:#fff;box-shadow:var(--shadow)}
.buoc.on .sb{background:var(--ink);color:#fff}
.buoc.on b{color:var(--ink)}
.buoc .tien{position:absolute;left:0;bottom:0;height:3px;width:0;background:var(--sun)}
.buoc.on .tien{animation:tien var(--t,6s) linear forwards}
.mb.dung .buoc.on .tien{animation-play-state:paused}
@keyframes tien{to{width:100%}}
.may{border-radius:28px;padding:12px;background:#fff;box-shadow:0 30px 70px -25px rgba(60,50,120,.45);aspect-ratio:16/10.5}
.may-dau{display:flex;align-items:center;gap:7px;padding:2px 6px 10px}
.may-dau i{width:11px;height:11px;border-radius:50%;background:#ff5f57}.may-dau i:nth-child(2){background:#febc2e}.may-dau i:nth-child(3){background:#28c840}
.may-dau span{margin-left:10px;flex:1;font-size:12px;color:var(--ink3);background:#f3f2fa;border-radius:8px;padding:4px 12px}
.man{position:relative;height:calc(100% - 32px);border-radius:16px;overflow:hidden;background:#f6f5ff}
.canh{position:absolute;inset:0;padding:16px;opacity:0;visibility:hidden;transform:scale(.97);transition:opacity .55s var(--ease),transform .65s var(--ease),visibility .55s}
.canh.on{opacity:1;visibility:visible;transform:none}
/* 1 video */
.c-video{display:grid;grid-template-columns:1.5fr 1fr;gap:12px;height:100%}
.vd{position:relative;border-radius:12px;overflow:hidden;background:#000}
.vd img{width:100%;height:100%;object-fit:cover;object-position:18% 40%}
.vd .play{position:absolute;left:50%;top:50%;width:56px;height:56px;margin:-28px 0 0 -28px;border-radius:50%;background:rgba(28,36,49,.75);display:grid;place-items:center;box-shadow:0 8px 20px rgba(0,0,0,.3)}
.vd .play::after{content:"";border-left:16px solid #fff;border-top:10px solid transparent;border-bottom:10px solid transparent;margin-left:4px}
.vd .thanh{position:absolute;left:10px;right:10px;bottom:10px;height:6px;border-radius:3px;background:rgba(255,255,255,.35);overflow:hidden}
.vd .thanh i{display:block;height:100%;width:0;background:var(--coral)}
.canh.on .vd .thanh i{animation:chay 6s linear forwards}
@keyframes chay{to{width:62%}}
.doan-ds{display:flex;flex-direction:column;gap:6px;font-size:12.5px;font-weight:600;overflow:hidden}
.doan{padding:8px 10px;border-radius:10px;background:#fff;display:flex;align-items:center;gap:8px;line-height:1.25}
.doan i{flex:none;width:28px;height:6px;border-radius:3px;background:#ececf5;position:relative;overflow:hidden}
.doan i::after{content:"";position:absolute;inset:0;width:var(--w,0%);background:var(--g,var(--mint))}
.doan.khoa{opacity:.45}
.doan .t{flex:1}
/* 2 mở khoá */
.c-khoa{display:grid;gap:10px;align-content:center;height:100%;padding:0 5%}
.kr{display:flex;align-items:center;gap:12px;padding:13px 16px;border-radius:14px;background:#fff}
.kr .kic{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:#f0eff8;color:var(--ink3);flex:none}
.kr .kic svg{width:20px;height:20px}
.kr b{font-size:14.5px}
.kr .tg{margin-left:auto;font-size:11.5px;font-weight:800;padding:4px 10px;border-radius:999px;background:#f0eff8;color:var(--ink3)}
.kr.mo .kic{background:#dcfaef;color:var(--mint)}.kr.mo .tg{background:#dcfaef;color:#0f9a73}
.kr.dong{opacity:.55}
.canh.on .kr.mo-dan{animation:mokhoa 1s var(--ease) 1.2s both}
@keyframes mokhoa{0%{transform:scale(1)}40%{transform:scale(1.04);box-shadow:0 0 0 5px rgba(34,199,154,.3)}100%{transform:scale(1)}}
/* 3 type */
.c-type{height:100%;border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;background:linear-gradient(160deg,#3a5a86,#243b5e);color:#fff;font-family:"Baloo 2",sans-serif}
.c-type .hd{font-size:14px;background:rgba(255,255,255,.18);padding:4px 14px;border-radius:999px}
.c-type .cau{font-size:clamp(20px,2.3vw,30px);font-weight:700;text-align:center}
.c-type .o{width:80%;min-height:54px;border-radius:14px;background:#fff;color:#1d3170;font-size:clamp(18px,2vw,24px);font-weight:700;display:flex;align-items:center;padding:0 18px;transition:.4s}
.c-type .o .caret{display:inline-block;width:2px;height:1.1em;background:var(--sky);margin-left:2px;animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.c-type .o.dung{box-shadow:0 0 0 4px #7fc4a6;background:#f0faf5}
.c-type .kq{font-size:28px;font-weight:800;opacity:0;transform:scale(.5);transition:.5s var(--ease)}
.c-type .kq.on{opacity:1;transform:none}
/* 4 100% */
.c-full{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px}
.vong{width:150px;height:150px;position:relative}
.vong svg{width:100%;height:100%;transform:rotate(-90deg)}
.vong circle{fill:none;stroke-width:13}
.vong .nen{stroke:#e9e8f5}
.vong .chay{stroke:var(--mint);stroke-linecap:round;stroke-dasharray:440;stroke-dashoffset:440;transition:stroke-dashoffset 1.8s var(--ease)}
.canh.on .vong .chay{stroke-dashoffset:0}
.vong b{position:absolute;inset:0;display:grid;place-items:center;font-family:"Baloo 2",sans-serif;font-size:36px}
.luot{display:flex;gap:8px}
.luot span{font-weight:800;font-size:13px;padding:6px 12px;border-radius:10px;background:#fff}
.luot span:last-child{background:var(--forest);color:#fff}
/* 5 sách */
.c-sach{height:100%;display:flex;align-items:center;justify-content:center;gap:24px}
.c-sach img{height:92%;width:auto;border-radius:6px;box-shadow:0 20px 40px -10px rgba(60,50,120,.45);transform:rotate(-4deg)}
.c-sach .cam{width:110px;height:110px;border-radius:50%;display:grid;place-items:center;background:#fff;box-shadow:var(--shadow);color:var(--ink)}
.c-sach .cam svg{width:44px;height:44px}
/* 6 thầy xem lại */
.c-xem{height:100%;display:grid;align-content:center;gap:7px;font-size:13px}
.bl{display:grid;grid-template-columns:28px 1fr 1fr 30px 44px;gap:10px;align-items:center;padding:9px 12px;border-radius:11px;background:#fff}
.bl.h{background:none;font-size:11px;font-weight:800;letter-spacing:.1em;color:var(--ink3);padding-top:0;padding-bottom:0}
.bl .go{font-family:ui-monospace,Consolas,monospace;color:#d6334a;font-weight:600}
.bl .go.ok{color:#0f9a73}
.bl .da{font-family:ui-monospace,Consolas,monospace;color:var(--ink3)}
.bl .x{color:var(--coral);font-weight:900}.bl .v{color:var(--mint);font-weight:900}
.bl .gi{color:var(--ink3);text-align:right}
.canh.on .bl:not(.h){animation:hh .5s var(--ease) both}
.canh.on .bl:nth-child(3){animation-delay:.1s}.canh.on .bl:nth-child(4){animation-delay:.2s}.canh.on .bl:nth-child(5){animation-delay:.3s}.canh.on .bl:nth-child(6){animation-delay:.4s}
@keyframes hh{from{opacity:0;transform:translateX(-14px)}to{opacity:1;transform:none}}
@media (max-width:900px){
  .mb{grid-template-columns:1fr;gap:12px}
  .may{order:-1;aspect-ratio:auto;height:44vh}
  .buoc-ds{grid-template-columns:1fr 1fr;gap:6px}
  .buoc{padding:8px 10px;gap:8px}.buoc b{font-size:13.5px}.buoc .sb{width:30px;height:30px;border-radius:10px;font-size:14px}
  .c-video{grid-template-columns:1fr}.doan-ds{display:none}
  .bl{grid-template-columns:22px 1fr 24px 38px}.bl .da{display:none}
}

/* ========== 7 · GAME ========== */
.game-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:26px}
.g{border-radius:24px;padding:12px 12px 14px;transition:transform .2s ease-out;will-change:transform}
.g-man{position:relative;aspect-ratio:16/8.6;border-radius:16px;overflow:hidden;background:var(--gbg);font-family:"Baloo 2","Montserrat",sans-serif;color:#fff}
.g-ten{display:flex;align-items:center;justify-content:space-between;gap:8px;margin:10px 4px 0}
.g h3{font-family:"Montserrat",sans-serif;font-weight:700;font-size:16.5px;line-height:1.15}
.g .sl{font-size:12.5px;font-weight:600;color:var(--ink3)}
.gq{position:absolute;inset:0;padding:10px;display:grid;grid-template-rows:auto auto 1fr;gap:7px}
.gq .tb{height:6px;border-radius:3px;background:rgba(255,255,255,.25);overflow:hidden}
.gq .tb i{display:block;height:100%;background:#e9cf97;animation:tb 4s linear infinite}
@keyframes tb{from{width:100%}to{width:0}}
.gq .q{font-weight:700;font-size:15px;text-align:center}
.gq .opts{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.gq .opts span{border-radius:10px;display:grid;place-items:center;font-weight:700;font-size:14px;border-bottom:3px solid rgba(0,0,0,.2)}
.gq .opts span:nth-child(1){background:#b8613f}.gq .opts span:nth-child(2){background:#b8893a}.gq .opts span:nth-child(3){background:#2f6b55}.gq .opts span:nth-child(4){background:#5f587f}
.gq .opts span.dung{animation:dung 4s var(--ease) infinite}
@keyframes dung{0%,55%{box-shadow:none;transform:none}65%,90%{box-shadow:0 0 0 3px #fff,0 0 18px #fff;transform:scale(1.05)}100%{box-shadow:none}}
.gt{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px}
.gt .q{font-size:15px;font-weight:700}
.gt .o{width:84%;height:36px;border-radius:10px;background:#fff;color:#16325c;font-weight:800;display:flex;align-items:center;padding:0 12px;font-size:15px;overflow:hidden;white-space:nowrap}
.gt .o span{display:inline-block;overflow:hidden;white-space:nowrap;border-right:2px solid var(--sky);animation:go 5s steps(22) infinite;width:0}
@keyframes go{0%{width:0}55%,90%{width:100%}100%{width:0}}
.ga2{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px}
.ga2 .o{display:flex;gap:6px}
.ga2 .o b{width:34px;height:40px;border-radius:9px;background:#fff;color:#5f587f;display:grid;place-items:center;font-size:21px;font-weight:800;box-shadow:0 4px 0 rgba(0,0,0,.2);animation:chu 5s var(--ease) infinite}
.ga2 .o b:nth-child(2){animation-delay:.2s}.ga2 .o b:nth-child(3){animation-delay:.4s}.ga2 .o b:nth-child(4){animation-delay:.6s}.ga2 .o b:nth-child(5){animation-delay:.8s}
@keyframes chu{0%{transform:translate(var(--dx),50px) rotate(var(--r));opacity:.4}20%,85%{transform:none;opacity:1}100%{transform:translate(var(--dx),50px) rotate(var(--r));opacity:.4}}
.gu{position:absolute;inset:0;background:#fffdf5;color:#1f2a44;display:flex;flex-direction:column;justify-content:center;gap:10px}
.gu .hang{display:flex;gap:6px;justify-content:center}
.gu .hang b{padding:5px 11px;border-radius:8px;border:2px solid #1f2a44;font-family:"Patrick Hand",cursive;font-size:18px;font-weight:400;background:#fff;animation:tu 6s var(--ease) infinite}
.gu .hang b:nth-child(2){animation-delay:.2s}.gu .hang b:nth-child(3){animation-delay:.4s}.gu .hang b:nth-child(4){animation-delay:.6s}
@keyframes tu{0%,15%{transform:none}35%,85%{transform:translateY(-6px);box-shadow:0 6px 0 #2f6b55;border-color:#2f6b55}100%{transform:none}}
.gu .pf{text-align:center;font-weight:800;color:#2f6b55;font-size:18px;letter-spacing:.1em;animation:pf 6s var(--ease) infinite}
@keyframes pf{0%,40%{opacity:0;transform:scale(.6)}50%,85%{opacity:1;transform:none}100%{opacity:0}}
.gs{position:absolute;inset:0;overflow:hidden}
.gs .bang{position:absolute;left:0;right:0;top:22%;height:28px;background:repeating-linear-gradient(90deg,rgba(0,0,0,.2) 0 12px,rgba(0,0,0,.08) 12px 24px);animation:bang 1s linear infinite}
@keyframes bang{to{background-position:24px 0}}
.gs .tu{position:absolute;top:calc(22% + 3px);padding:1px 10px;border-radius:7px;background:#fff;color:#0e5a4a;font-weight:800;font-size:13px;animation:truot 5s linear infinite}
.gs .tu:nth-of-type(2){animation-delay:-1.7s}.gs .tu:nth-of-type(3){animation-delay:-3.4s}
@keyframes truot{from{left:-25%}to{left:105%}}
.gs .ro{position:absolute;bottom:10px;width:42%;height:40%;border-radius:12px;border:2px dashed rgba(255,255,255,.7);display:grid;place-items:center;font-weight:800;font-size:13px}
.gs .ro.a{left:5%}.gs .ro.b{right:5%}
.gb{position:absolute;inset:0;display:grid;grid-template-columns:repeat(4,1fr);gap:7px;padding:12px;perspective:600px}
.gb span{border-radius:10px;background:linear-gradient(160deg,#c9a15c,#a8743f);display:grid;place-items:center;font-weight:800;font-size:18px;box-shadow:0 4px 0 rgba(0,0,0,.18)}
.gb span:nth-child(3),.gb span:nth-child(6){animation:lat 7s var(--ease) infinite}.gb span:nth-child(6){animation-delay:2.4s}
@keyframes lat{0%,20%{transform:none}30%,60%{transform:rotateY(180deg);background:#fff;color:#a8743f}70%,100%{transform:none}}
@media (max-width:900px){.game-grid{grid-template-columns:1fr 1fr;gap:10px}.g{padding:8px 8px 10px;border-radius:18px}.g h3{font-size:15px}.g .sl{display:none}.gq .q,.gt .q{font-size:12px}.gq .opts span{font-size:11px}.ga2 .o b{width:24px;height:30px;font-size:15px}.gu .hang b{font-size:13px;padding:3px 6px}.gb span{font-size:13px}.gt .o{font-size:11px;height:28px}}

/* ========== 8 · XẾP HẠNG ========== */
.xh{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(24px,4vw,60px);align-items:center}
.bang-xh{border-radius:28px;padding:18px}
.bxh-dau{display:flex;align-items:center;justify-content:space-between;margin:0 4px 12px;font-weight:800}
.live{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--coral);letter-spacing:.12em}
.live i{width:8px;height:8px;border-radius:50%;background:var(--coral);animation:nhay 1.2s infinite}
@keyframes nhay{50%{opacity:.3}}
.bxh{position:relative;height:calc(8 * 54px)}
.hs{position:absolute;left:0;right:0;height:47px;display:grid;grid-template-columns:36px 36px 1fr auto 56px;gap:10px;align-items:center;padding:0 14px 0 6px;border-radius:14px;
  background:#fff;box-shadow:0 2px 8px rgba(60,50,120,.06);transition:transform .9s var(--ease),background .5s,box-shadow .5s}
.hs .h{font-weight:800;font-size:16px;text-align:center;color:var(--ink3)}
.hs .av{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-weight:800;font-size:14px;color:#fff}
.hs .t{font-weight:700;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hs .d{font-weight:800;font-variant-numeric:tabular-nums}
.hs .d small{color:var(--ink3);font-weight:600}
.hs .tg{font-size:12.5px;color:var(--ink3);text-align:right;font-variant-numeric:tabular-nums}
.hs.r1{background:linear-gradient(90deg,#f4ead3,#fff);box-shadow:0 8px 20px -10px rgba(184,137,58,.6)}
.hs.r2{background:linear-gradient(90deg,#eceef1,#fff)}
.hs.r3{background:linear-gradient(90deg,#f1e3d8,#fff)}
.hs .up{position:absolute;right:-6px;top:-9px;font-size:11px;font-weight:800;padding:2px 8px;border-radius:999px;background:var(--forest);color:#fff;opacity:0;transform:translateY(6px);transition:.5s}
.hs.len{animation:len 1.2s var(--ease)}
.hs.len .up{opacity:1;transform:none}
@keyframes len{30%{box-shadow:0 0 0 2px var(--mint),0 10px 24px -8px rgba(47,107,85,.5)}}
.cup{width:clamp(84px,9vw,120px);height:clamp(84px,9vw,120px);border-radius:50%;display:grid;place-items:center;margin-top:18px;color:var(--sun);background:#fff;box-shadow:var(--shadow);border:1px solid rgba(184,137,58,.3)}
.cup svg{width:46%;height:46%}
.medal{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;font-size:12.5px;font-weight:800;color:#fff}
.medal.m1{background:linear-gradient(135deg,#dcb466,#a97d2c)}.medal.m2{background:linear-gradient(135deg,#c9ced6,#8e96a3)}.medal.m3{background:linear-gradient(135deg,#d39a73,#9c6440)}
@media (max-width:900px){.xh{grid-template-columns:1fr;text-align:center;gap:12px}.cup{display:none}.bxh{height:calc(8 * 46px)}.hs{height:40px;grid-template-columns:28px 30px 1fr auto;gap:8px}.hs .tg{display:none}.hs .av{width:28px;height:28px}}

/* ========== 9 · THEO DÕI ========== */
.dg{margin-top:22px;border-radius:28px;padding:clamp(12px,2vw,22px)}
.dg-tab{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:14px;align-items:center}
.dg-tab button{border:0;background:#f1f0f8;border-radius:12px;padding:8px 14px;font-size:13px;font-weight:800;letter-spacing:.05em;cursor:pointer;color:var(--ink2);transition:.3s}
.dg-tab button.on{background:var(--ink);color:#fff}
.dg-tab .bai{margin-left:auto;font-size:13px;color:var(--ink3);font-weight:600}
.dg-panel{display:none}.dg-panel.on{display:block;animation:hp .5s var(--ease)}
@keyframes hp{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.tl-wrap{overflow-x:auto}
.tl{width:100%;border-collapse:separate;border-spacing:0 6px;font-size:13.5px}
.tl th{font-size:11px;font-weight:800;letter-spacing:.08em;color:var(--ink3);text-align:right;padding:0 10px 2px;white-space:nowrap}
.tl th:first-child{text-align:left}
.tl td{padding:8px 10px;background:#f7f6fc;text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums;font-weight:600}
.tl td:first-child{text-align:left;border-radius:12px 0 0 12px;font-weight:700}
.tl td:last-child{border-radius:0 12px 12px 0;font-weight:800;color:var(--coral)}
.tl .av{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;font-size:11px;margin-right:9px;color:#fff;vertical-align:middle}
.pv{display:inline-block;min-width:70px;position:relative;padding:3px 8px;border-radius:8px;overflow:hidden;background:#ecebf5;font-size:12.5px;font-weight:800}
.pv::before{content:"";position:absolute;left:0;top:0;bottom:0;width:0;background:var(--c);opacity:.45;transition:width 1.6s var(--ease)}
.dg.in .pv::before{width:var(--w)}
.pv span{position:relative}
.gio{display:inline-block;padding:3px 9px;border-radius:8px;font-weight:800;font-size:12.5px;background:color-mix(in srgb,var(--mint) var(--a,20%),#fff);color:#173d31}
.gio.ok::after{content:" ✓"}
.gio.thieu{background:#f5e4de;color:#9a4a2e}
.dg-2{display:grid;grid-template-columns:1.2fr 1fr;gap:14px}
.o-so{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:12px}
.o-so div{padding:12px;border-radius:14px;background:#f7f6fc}
.o-so small{display:block;font-size:11px;font-weight:800;letter-spacing:.06em;color:var(--ink3);text-transform:uppercase}
.o-so b{font-family:"Montserrat",sans-serif;font-weight:700;font-size:21px}
.bieu{padding:14px;border-radius:16px;background:#f7f6fc}
.bieu h5{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink3);margin-bottom:8px}
.cot{display:flex;align-items:flex-end;gap:8px;height:150px;position:relative;padding-bottom:20px}
.cot .c{flex:1;display:flex;flex-direction:column-reverse;gap:2px;height:100%;position:relative}
.cot .c i{display:block;border-radius:4px;height:0;transition:height 1.2s var(--ease)}
.cot .c small{position:absolute;bottom:-20px;left:50%;transform:translateX(-50%);font-size:10.5px;color:var(--ink3);white-space:nowrap}
.tien-trien svg{width:100%;height:170px;overflow:visible}
.tien-trien .duong{fill:none;stroke:var(--mint);stroke-width:3.5;stroke-linecap:round;stroke-dasharray:900;stroke-dashoffset:900;transition:stroke-dashoffset 2.2s var(--ease)}
.tien-trien .vung{fill:url(#gtt);opacity:0;transition:opacity 1.2s .8s}
.dg.ve .tien-trien .duong{stroke-dashoffset:0}.dg.ve .tien-trien .vung{opacity:1}
.tien-trien text{font-size:11px;fill:var(--ink3);font-family:inherit;font-weight:600}
.tien-trien .diem{fill:#fff;stroke:var(--mint);stroke-width:3}
.tien-trien .luoi{stroke:rgba(31,37,71,.07)}
.dg-nop{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.nop{border-radius:14px;padding:10px;background:#f7f6fc}
.nop .ang{aspect-ratio:3/3.4;border-radius:8px;overflow:hidden;background:#fff;margin-bottom:6px;position:relative}
.nop .ang img{width:100%;height:100%;object-fit:cover;object-position:top}
.nop .tre{position:absolute;top:6px;right:6px;font-size:10px;font-weight:800;padding:2px 7px;border-radius:6px;background:var(--coral);color:#fff}
.nop b{font-size:13px;display:block}
.nop small{font-size:11.5px;color:var(--ink3)}
.minh-hoa{font-size:11.5px;color:var(--ink3);text-align:right;margin-top:8px}
.dg-y{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:18px}
.dg-y span{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:14.5px;padding:9px 16px;border-radius:999px;background:#fff;box-shadow:var(--shadow)}
.dg-y span i{width:10px;height:10px;border-radius:50%;background:var(--c)}
@media (max-width:900px){.dg-2{grid-template-columns:1fr}.dg-2 .bieu:first-child{display:none}.o-so{grid-template-columns:repeat(2,1fr)}.dg-nop{grid-template-columns:repeat(2,1fr)}.dg-nop .nop:nth-child(n+3){display:none}.dg-tab .bai{display:none}.dg-y{display:none}}

/* ========== 10 · ĐĂNG KÝ ========== */
.dk{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(24px,4vw,60px);align-items:center}
.cam-ket{display:flex;align-items:center;gap:16px;padding:18px 20px;border-radius:22px;margin-top:22px;background:#fff;box-shadow:var(--shadow);border-left:3px solid var(--sun)}
.cam-ket .khien{flex:none;width:70px;height:70px;border-radius:50%;display:grid;place-items:center;background:var(--forest);color:#e9cf97;font-family:"Montserrat",sans-serif;font-weight:700;font-size:19px}
.cam-ket b{display:block;font-family:"Montserrat",sans-serif;font-weight:700;font-size:clamp(20px,2vw,25px);line-height:1.2}
.cam-ket span{font-size:14.5px;color:var(--ink2);font-weight:600}
.dk-chip{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.dk-chip span{font-weight:600;font-size:13.5px;color:var(--ink2);padding:7px 14px;border-radius:999px;background:#fff;box-shadow:var(--shadow)}
.form{border-radius:30px;padding:clamp(20px,3vw,34px);position:relative;overflow:hidden;background:#fff;box-shadow:0 30px 70px -25px rgba(60,50,120,.45)}
.form::before{content:"";position:absolute;left:0;right:0;top:0;height:4px;background:linear-gradient(90deg,var(--mint),var(--sun))}
.form h3{font-family:"Montserrat",sans-serif;font-weight:700;font-size:27px;line-height:1.1;margin-bottom:18px}
.hang2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.fld{position:relative;margin-bottom:12px}
.fld input{width:100%;height:56px;padding:22px 16px 6px;border-radius:14px;background:#f6f5fb;border:2px solid transparent;outline:none;font-size:16px;font-weight:600;transition:.3s}
.fld label{position:absolute;left:18px;top:17px;font-size:15px;color:var(--ink3);pointer-events:none;transition:.25s var(--ease)}
.fld input:focus{border-color:var(--mint);background:#fff;box-shadow:0 0 0 4px rgba(47,107,85,.12)}
.fld input:focus+label,.fld input:not(:placeholder-shown)+label,.fld.co label{top:7px;font-size:11.5px;font-weight:700;color:var(--mint)}
.fld .loi{display:none;font-size:12.5px;color:var(--coral);margin-top:4px;padding-left:4px;font-weight:600}
.fld.sai input{border-color:var(--coral);background:#fbf3ef}
.fld.sai .loi{display:block}
.tick{display:flex;gap:12px;align-items:flex-start;padding:14px;border-radius:14px;background:#faf5ea;border:1.5px solid #e6d3a8;cursor:pointer;margin:4px 0 16px;font-size:15px;line-height:1.45;font-weight:700}
.tick input{position:absolute;opacity:0;pointer-events:none}
.tick .hop{flex:none;width:24px;height:24px;border-radius:7px;border:2px solid var(--sun);display:grid;place-items:center;background:#fff;transition:.3s var(--ease)}
.tick .hop svg{width:15px;height:15px;color:#fff;opacity:0;transform:scale(.4);transition:.3s var(--ease)}
.tick input:checked+.hop{background:var(--sun)}
.tick input:checked+.hop svg{opacity:1;transform:none}
.tick input:focus-visible+.hop{box-shadow:0 0 0 4px rgba(255,154,60,.3)}
.tick.sai{border-color:var(--coral);animation:lac .5s}
@keyframes lac{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.form .btn{width:100%;justify-content:center;padding:18px;font-size:18px}
.xong{position:absolute;inset:0;display:grid;place-items:center;text-align:center;padding:30px;background:rgba(255,255,255,.97);opacity:0;visibility:hidden;transition:.5s var(--ease)}
.xong.on{opacity:1;visibility:visible}
.xong .tickto{width:90px;height:90px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;background:var(--forest);box-shadow:0 16px 30px -12px rgba(36,79,64,.7)}
.xong .tickto svg{width:46px;height:46px;color:#fff;stroke-dasharray:40;stroke-dashoffset:40;transition:stroke-dashoffset .8s .3s var(--ease)}
.xong.on .tickto svg{stroke-dashoffset:0}
.xong h4{font-family:"Montserrat",sans-serif;font-weight:700;font-size:28px;margin-bottom:6px}
.xong p{color:var(--ink2);max-width:360px;margin:0 auto 18px}
.chan{position:absolute;left:0;right:0;bottom:14px;text-align:center;font-size:13px;color:var(--ink3);font-weight:600}
@media (max-width:900px){.dk{grid-template-columns:1fr;gap:14px}.dk .tt{font-size:30px;margin:6px 0 0}.cam-ket{margin-top:10px;padding:12px}.cam-ket .khien{width:54px;height:54px;font-size:16px}.dk-chip{display:none}.chan{display:none}}
@media (max-width:520px){.hang2{grid-template-columns:1fr;gap:0}.fld input{height:50px}}

.conf{position:fixed;inset:0;z-index:95;pointer-events:none}
.bay{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.gui-loi{color:var(--coral);font-size:13px;font-weight:600;text-align:center;margin-top:8px;min-height:0}
.gui-loi:empty{display:none}
.form .btn.dang{opacity:.7;pointer-events:none}
.form .btn.dang svg{animation:quay 1s linear infinite}
@keyframes quay{to{transform:rotate(360deg)}}

/* màn hình thấp (laptop 768) */
@media (max-height:780px) and (min-width:901px){
  section{padding-top:74px;padding-bottom:24px}
  h2.tt{font-size:clamp(30px,3.8vw,48px);margin:10px 0 6px}
  .so-grid{margin-top:22px}.so{padding:18px 14px}
  .bxh{height:calc(8 * 48px)}.hs{height:42px}
  .quat{height:46vh}
  .game-grid{gap:12px;margin-top:16px}.g-man{aspect-ratio:16/7.6}
  .cot{height:120px}.tien-trien svg{height:140px}
}

/* =====================================================================
   v8 · ĐIỆN THOẠI (≤ 700px) — chỉ áp cho màn hẹp, máy tính giữ như v7
   ===================================================================== */
@media (max-width:700px){
  body{font-size:15.5px}
  section{padding:64px 30px 88px;min-height:100svh}
  h2.tt{font-size:27px;margin:8px 0 6px;line-height:1.2}
  .nhan{font-size:10.5px;letter-spacing:.2em}
  .nhan::before,.center .nhan::after{width:16px}

  /* nút nổi gọn lại */
  .fab{right:auto;left:50%;bottom:14px;transform:translateX(-50%)}
  .fab.an{transform:translate(-50%,150%)}
  .fab .btn{padding:11px 16px 11px 13px;font-size:14.5px}
  .fab .btn svg{width:16px;height:16px}

  /* 1 · mở đầu */
  .hero{padding-top:58px;padding-bottom:24px}
  .hero-stage{height:36vh;margin-top:0}
  .hero-hint{display:none}
  .k10{font-size:12.5px}
  .hero h1{font-size:44px;margin:10px 0 8px}
  .hero .phu{font-size:15.5px;margin-bottom:16px;line-height:1.5}
  .hero .phu b.lien{white-space:nowrap;display:inline-block}
  .bao{font-size:13px;margin-bottom:14px;padding:8px 12px 8px 8px}
  .bao .kh{width:30px;height:30px}
  .hero .btn-main{padding:14px 24px;font-size:15.5px}

  /* 2 · của thầy */
  .thay{gap:12px;margin-top:10px}
  .thay-anh{display:block;aspect-ratio:16/8;border-width:4px;border-radius:20px}
  .thay-anh img{transform:scale(1.25);transform-origin:38% 35%;object-position:38% 28%}
  .thay-anh .ten{bottom:8px;padding:4px 12px}.thay-anh .ten b{font-size:13px}
  .cua{grid-template-columns:1fr;gap:8px}
  .cua .o,.cua .o:nth-child(4),.cua .o:nth-child(5){grid-column:auto}
  .cua .o{display:grid;grid-template-columns:38px 1fr;column-gap:12px;align-items:center;padding:9px 14px;border-radius:16px}
  .cua .ic{grid-row:1/3;width:38px;height:38px;border-radius:11px;margin:0}
  .cua .ic svg{width:19px;height:19px}
  .cua small{font-size:10.5px}
  .cua b{font-size:15px}
  .dong{font-size:13px;margin-top:10px;justify-content:center}

  /* 3 · sách */
  .sach{margin-top:4px}
  .quat{height:46vh}
  .quat .tr{width:30vw}
  .quat-nut button{padding:7px 14px;font-size:13px}

  /* 4 · lộ trình: một cột gọn */
  .lt{grid-template-columns:1fr;gap:6px;margin-top:12px}
  .ch{padding:7px 12px;gap:10px;border-radius:14px}
  .ch .sn{width:30px;height:30px;font-size:14px;border-width:1.5px}
  .ch .sn svg{width:15px;height:15px}
  .ch>div{display:flex;justify-content:space-between;align-items:baseline;gap:8px;flex:1;min-width:0}
  .ch b{font-size:14.5px;white-space:nowrap}
  .ch span{font-size:11.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .thi{gap:6px;margin-top:12px}.thi span{font-size:12px;padding:5px 11px}

  /* 5 · một bài học */
  .mb{gap:10px;margin-top:10px}
  .may{height:38vh;padding:8px;border-radius:20px}
  .may-dau{padding:0 4px 6px}.may-dau span{font-size:10.5px}
  .man{height:calc(100% - 24px)}
  .canh{padding:10px}
  .buoc-ds{grid-template-columns:repeat(3,1fr);gap:6px}
  .buoc{flex-direction:column;align-items:center;text-align:center;gap:5px;padding:8px 4px;border-radius:14px}
  .buoc .sb{width:28px;height:28px;font-size:13px;border-radius:9px}
  .buoc b{font-size:11.5px;line-height:1.25}
  .c-type .cau{font-size:18px}.c-type .o{min-height:44px;font-size:16px;width:90%}
  .vong{width:110px;height:110px}.vong b{font-size:26px}
  .luot span{font-size:11px;padding:4px 8px}
  .c-khoa{padding:0;gap:7px}.kr{padding:8px 10px;gap:8px}.kr b{font-size:12.5px}.kr .kic{width:30px;height:30px}.kr .tg{font-size:10px;padding:3px 7px}
  .c-xem{font-size:11.5px}.bl{padding:7px 9px;gap:6px}
  .c-sach img{height:80%}.c-sach .cam{width:76px;height:76px}.c-sach .cam svg{width:32px;height:32px}

  /* 6 · game */
  .game-grid{gap:8px;margin-top:12px}
  .g{padding:7px 7px 9px;border-radius:16px}
  .g-man{aspect-ratio:4/3;border-radius:11px}
  .g-ten{margin:7px 3px 0}.g h3{font-size:13.5px}
  .gq{padding:8px;gap:5px}.gq .q{font-size:11.5px}.gq .opts{gap:4px}.gq .opts span{font-size:11px;border-radius:7px}
  .gt .q{font-size:11.5px;text-align:center;padding:0 6px}.gt .o{height:26px;font-size:10.5px;width:88%}
  .ga2 .o{gap:4px}.ga2 .o b{width:22px;height:28px;font-size:14px;border-radius:6px}
  .gu .hang{gap:3px;flex-wrap:wrap}.gu .hang b{font-size:13px;padding:2px 6px}.gu .pf{font-size:12px}
  .gs .bang{height:22px}.gs .tu{font-size:10px;padding:0 6px;top:calc(22% + 3px)}.gs .ro{font-size:8.5px;height:42%;text-align:center;line-height:1.2}
  .gb{gap:4px;padding:8px}.gb span{font-size:12px;border-radius:7px}

  /* 7 · xếp hạng */
  .bang-xh{text-align:left;padding:12px;border-radius:20px}
  .bxh-dau{font-size:13px}
  .hs .t{font-size:14px}

  /* 8 · theo dõi: chỉ giữ cột quan trọng */
  .nhan{flex-wrap:nowrap;white-space:nowrap}
  #theodoi .nhan::before,#theodoi .nhan::after{display:none}
  .dg{padding:10px;border-radius:20px;margin-top:12px}
  .dg-tab{gap:4px;flex-wrap:nowrap}.dg-tab button{padding:7px 9px;font-size:11px}
  .tl{font-size:12.5px}
  .tl th:nth-child(4),.tl th:nth-child(5),.tl td:nth-child(4),.tl td:nth-child(5){display:none}
  .tl td,.tl th{padding-left:5px;padding-right:5px}
  .tl .av{display:none}
  .tl{font-size:12px}.pv{min-width:50px;font-size:11.5px;padding:3px 6px}.gio{font-size:11.5px;padding:3px 6px}
  .tl-wrap{overflow:hidden}
  .o-so{gap:6px}.o-so div{padding:8px}.o-so b{font-size:16px}
  .cot{height:110px}.tien-trien svg{height:120px}

  /* 9 · con số */
  .so-grid{gap:8px;margin-top:14px}
  .so{padding:12px 8px}
  .so .n{font-size:32px}
  .so .d{font-size:12.5px;margin-top:4px}

  /* 10 · đăng ký */
  #dangky{padding-bottom:20px}
  .dk{gap:10px}
  .dk .nhan{display:none}
  .dk .tt{font-size:26px;margin:0}
  .cam-ket{margin-top:8px;padding:10px 12px;gap:10px;border-radius:16px}
  .cam-ket .khien{width:46px;height:46px;font-size:13px}
  .cam-ket b{font-size:17px}.cam-ket span{font-size:12.5px}
  .form{padding:16px 14px 14px;border-radius:22px}
  .form h3{font-size:19px;margin-bottom:10px}
  .hang2{grid-template-columns:1fr;gap:0}
  .hang2.doi{grid-template-columns:1fr 1fr;gap:8px}
  .fld{margin-bottom:8px}
  .fld input{height:46px;padding:19px 13px 4px;font-size:15px;border-radius:12px}
  .fld label{left:14px;top:14px;font-size:14px}
  .fld input:focus+label,.fld input:not(:placeholder-shown)+label,.fld.co label{top:5px;font-size:10.5px}
  .tick{padding:10px;font-size:13px;margin:2px 0 10px;gap:10px}
  .tick .hop{width:21px;height:21px}
  .form .btn{padding:14px;font-size:16px}
}
@media (max-width:700px) and (max-height:700px){
  .hero-stage{height:30vh}
  .hero h1{font-size:38px}
  .quat{height:40vh}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001s!important;animation-iteration-count:1!important;transition-duration:.001s!important}
  .rv{opacity:1;transform:none}
  html{scroll-behavior:auto}
}