/* ================= BỨT PHÁ 10 — giao diện ================= */
:root{
  --pri:#5b5bd6; --pri-2:#7c6cf5; --pri-soft:#eef0ff;
  --ok:#16a34a; --ok-soft:#e7f8ec;
  --bad:#e11d48; --bad-soft:#ffe9ee;
  --warn:#f59e0b; --warn-soft:#fff4e0;
  --toan:#3b82f6; --van:#f59e0b; --nentang:#10b981;
  --bg:#f5f6fb; --card:#fff; --line:#e6e8f2;
  --txt:#1c1e2b; --mut:#6b7194; --mut2:#9aa0bd;
  --r:18px; --r-sm:12px;
  --sh:0 2px 4px rgba(28,30,43,.04),0 8px 24px rgba(28,30,43,.06);
  --sh-lg:0 12px 40px rgba(60,50,160,.16);
  --nav-h:66px;
  font-size:16px;
}
@media (prefers-color-scheme: dark){
  :root{--bg:#12131c;--card:#1b1d29;--line:#2b2e40;--txt:#eceefb;--mut:#a2a8c9;--mut2:#767ca0;
        --pri-soft:#232449;--ok-soft:#14301f;--bad-soft:#3a1220;--warn-soft:#3a2a0e;
        --sh:0 2px 4px rgba(0,0,0,.2),0 8px 24px rgba(0,0,0,.25)}
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--txt);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  overscroll-behavior-y:none;
}
img{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--pri);text-decoration:none}

/* ---------- Khởi động ---------- */
.boot{height:100vh;display:grid;place-content:center;text-align:center;color:var(--mut)}
.boot-logo{font-size:64px;animation:pulse 1.2s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.15)}}

/* ---------- Bố cục ---------- */
.shell{display:flex;min-height:100vh}
.side{
  width:236px;flex:0 0 236px;background:var(--card);border-right:1px solid var(--line);
  padding:20px 14px;position:sticky;top:0;height:100vh;display:flex;flex-direction:column;gap:6px;
}
.side .brand{font-weight:900;font-size:20px;letter-spacing:-.4px;padding:6px 10px 18px;display:flex;align-items:center;gap:8px}
.side a.nav{
  display:flex;align-items:center;gap:11px;padding:11px 13px;border-radius:13px;color:var(--mut);
  font-weight:600;font-size:15px;transition:.15s;
}
.side a.nav:hover{background:var(--pri-soft);color:var(--pri)}
.side a.nav.on{background:linear-gradient(90deg,var(--pri),var(--pri-2));color:#fff;box-shadow:0 6px 16px rgba(91,91,214,.32)}
.side .spacer{flex:1}
.main{flex:1;min-width:0;padding:26px 30px 60px;max-width:1160px;margin:0 auto;width:100%}
.tabbar{display:none}

@media (max-width:860px){
  .side{display:none}
  .main{padding:14px 14px calc(var(--nav-h) + 26px)}
  .tabbar{
    display:flex;position:fixed;left:0;right:0;bottom:0;height:var(--nav-h);z-index:60;
    background:var(--card);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);
  }
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
            font-size:11px;font-weight:600;color:var(--mut2)}
  .tabbar a .ic{font-size:21px;line-height:1}
  .tabbar a.on{color:var(--pri)}
}

/* ---------- Thanh trên ---------- */
.topbar{display:flex;align-items:center;gap:12px;margin-bottom:20px;flex-wrap:wrap}
.topbar h1{font-size:26px;margin:0;letter-spacing:-.5px;font-weight:800;flex:1;min-width:0}
.topbar .sub{color:var(--mut);font-size:14px;margin:2px 0 0;font-weight:500}
.chip{
  display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:999px;
  background:var(--pri-soft);color:var(--pri);font-size:13px;font-weight:700;white-space:nowrap;
}
.chip.gray{background:var(--line);color:var(--mut)}
.chip.ok{background:var(--ok-soft);color:var(--ok)}
.chip.bad{background:var(--bad-soft);color:var(--bad)}
.chip.warn{background:var(--warn-soft);color:#b45309}

/* ---------- Thẻ ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;box-shadow:var(--sh)}
.card + .card{margin-top:16px}
.card h2{margin:0 0 14px;font-size:18px;font-weight:800;letter-spacing:-.3px}
.card h3{margin:20px 0 8px;font-size:16px;font-weight:800}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(160px,1fr))}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.muted{color:var(--mut)}
.small{font-size:13.5px}
.center{text-align:center}

/* ---------- Nút ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:0;border-radius:14px;font-weight:800;font-size:15px;cursor:pointer;
  background:linear-gradient(135deg,var(--pri),var(--pri-2));color:#fff;
  box-shadow:0 5px 0 rgba(70,60,180,.45);transition:.12s;user-select:none;
}
.btn:active{transform:translateY(3px);box-shadow:0 2px 0 rgba(70,60,180,.45)}
.btn:disabled{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
.btn.ghost{background:var(--card);color:var(--pri);border:2px solid var(--line);box-shadow:0 4px 0 var(--line)}
.btn.ok{background:linear-gradient(135deg,#22c55e,#16a34a);box-shadow:0 5px 0 #12703a}
.btn.bad{background:linear-gradient(135deg,#fb7185,#e11d48);box-shadow:0 5px 0 #9f1239}
.btn.sm{padding:8px 14px;font-size:13.5px;border-radius:11px;box-shadow:0 3px 0 rgba(70,60,180,.4)}
.btn.wide{width:100%}
.btn.warn{background:linear-gradient(135deg,#fbbf24,#f59e0b);box-shadow:0 5px 0 #b45309;color:#3b2500}

/* ---------- Thanh tiến trình ---------- */
.bar{height:11px;border-radius:99px;background:var(--line);overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--pri),var(--pri-2));
       transition:width .6s cubic-bezier(.2,.8,.2,1)}
.bar.thin{height:7px}
.bar.ok>i{background:linear-gradient(90deg,#4ade80,#16a34a)}
.bar.warn>i{background:linear-gradient(90deg,#fbbf24,#f59e0b)}

/* ---------- Đầu trang người học ---------- */
.hero{
  background:linear-gradient(135deg,#5b5bd6,#8b5cf6 55%,#ec4899);
  border-radius:24px;padding:22px 24px;color:#fff;box-shadow:var(--sh-lg);position:relative;overflow:hidden;
}
.hero:after{content:"";position:absolute;right:-40px;top:-60px;width:220px;height:220px;border-radius:50%;
            background:rgba(255,255,255,.12)}
.hero .who{display:flex;align-items:center;gap:14px;position:relative;z-index:1}
.hero .ava{width:60px;height:60px;border-radius:20px;background:rgba(255,255,255,.2);display:grid;place-content:center;font-size:32px;flex:0 0 auto}
.hero h2{margin:0;font-size:22px;font-weight:800}
.hero .rank{opacity:.92;font-size:14px;font-weight:600}
.hero .stats{display:flex;gap:20px;margin-top:16px;position:relative;z-index:1;flex-wrap:wrap}
.hero .stat b{display:block;font-size:20px;font-weight:900;line-height:1.2}
.hero .stat span{font-size:12px;opacity:.85;font-weight:600}
.hero .xpbar{margin-top:14px;position:relative;z-index:1}
.hero .xpbar .bar{background:rgba(255,255,255,.25)}
.hero .xpbar .bar>i{background:linear-gradient(90deg,#fde68a,#fbbf24)}
.hero .xpbar p{margin:6px 0 0;font-size:12.5px;opacity:.9;font-weight:600}

/* ---------- Nhiệm vụ ---------- */
.quest{display:flex;align-items:center;gap:12px;padding:11px 0;border-bottom:1px dashed var(--line)}
.quest:last-child{border:0}
.quest .qi{font-size:22px;width:34px;text-align:center;flex:0 0 auto}
.quest .qt{flex:1;min-width:0}
.quest .qt b{display:block;font-size:14.5px;font-weight:700}
.quest .qn{font-size:13px;font-weight:800;color:var(--mut);flex:0 0 auto}
.quest.done .qt b{color:var(--ok)}

/* ---------- Thẻ môn học ---------- */
.subj{
  display:block;border-radius:22px;padding:20px;color:#fff;position:relative;overflow:hidden;
  box-shadow:var(--sh);transition:.18s;cursor:pointer;border:0;text-align:left;width:100%;
}
.subj:hover{transform:translateY(-3px);box-shadow:var(--sh-lg)}
.subj .ic{font-size:38px;line-height:1}
.subj h3{margin:8px 0 2px;font-size:19px;font-weight:800;color:#fff}
.subj p{margin:0 0 14px;font-size:13px;opacity:.9;line-height:1.45}
.subj .bar{background:rgba(255,255,255,.3)}
.subj .bar>i{background:#fff}
.subj .meta{display:flex;justify-content:space-between;font-size:12.5px;font-weight:700;margin-top:7px;opacity:.95}

/* ---------- Chương & bài ---------- */
.chap{border:1px solid var(--line);border-radius:var(--r);background:var(--card);overflow:hidden;box-shadow:var(--sh)}
.chap + .chap{margin-top:14px}
.chap-h{display:flex;align-items:center;gap:14px;padding:16px 18px;cursor:pointer;user-select:none}
.chap-h .ic{width:46px;height:46px;border-radius:14px;display:grid;place-content:center;font-size:24px;flex:0 0 auto;color:#fff}
.chap-h .tt{flex:1;min-width:0}
.chap-h .tt b{display:block;font-size:16px;font-weight:800;letter-spacing:-.2px}
.chap-h .tt span{font-size:12.5px;color:var(--mut)}
.chap-h .pc{font-size:13px;font-weight:800;color:var(--mut)}
.chap-h .car{transition:.2s;color:var(--mut2)}
.chap.open .chap-h .car{transform:rotate(90deg)}
.chap-b{display:none;padding:0 12px 12px}
.chap.open .chap-b{display:block}
.chap-intro{font-size:13.5px;color:var(--mut);padding:0 6px 12px;line-height:1.6}

.lsn{display:flex;align-items:center;gap:12px;padding:12px 12px;border-radius:14px;transition:.13s;cursor:pointer}
.lsn:hover{background:var(--pri-soft)}
.lsn .no{width:34px;height:34px;border-radius:11px;background:var(--pri-soft);color:var(--pri);
         display:grid;place-content:center;font-weight:900;font-size:14px;flex:0 0 auto}
.lsn.done .no{background:var(--ok-soft);color:var(--ok)}
.lsn .tt{flex:1;min-width:0}
.lsn .tt>b{display:block;font-size:14.7px;font-weight:700;line-height:1.35}
.lsn .tt span{font-size:12px;color:var(--mut)}
.lsn .tt span b{display:inline;font-size:inherit;color:var(--txt)}
.lsn .st{font-size:13px;letter-spacing:1px;flex:0 0 auto}

/* ---------- Bài giảng ---------- */
.lesson{max-width:820px}
.lesson h2.title{font-size:25px;margin:0 0 4px;font-weight:900;letter-spacing:-.6px}
.sec{margin:22px 0}
.sec > h3{font-size:18px;margin:0 0 10px;font-weight:800;display:flex;align-items:center;gap:8px}
.sec p{margin:0 0 10px}
.sec ul,.sec ol{margin:6px 0 12px;padding-left:22px}
.sec li{margin:5px 0}
.box{border-radius:var(--r-sm);padding:14px 16px;margin:14px 0;border-left:5px solid}
.box.idea{background:var(--pri-soft);border-color:var(--pri)}
.box.tip{background:var(--ok-soft);border-color:var(--ok)}
.box.warn{background:var(--warn-soft);border-color:var(--warn)}
.box.key{background:linear-gradient(135deg,#fff7ed,#ffedd5);border-color:#f97316}
@media (prefers-color-scheme:dark){.box.key{background:linear-gradient(135deg,#3b2a12,#42260f)}}
.box b.lbl{display:block;font-size:12.5px;text-transform:uppercase;letter-spacing:.7px;margin-bottom:5px;opacity:.75}

.eg{border:2px dashed var(--line);border-radius:var(--r-sm);padding:14px 16px;margin:14px 0;background:var(--card)}
.eg .egh{font-weight:800;color:var(--pri);margin-bottom:8px;font-size:14.5px}
.eg ol{counter-reset:st;list-style:none;padding-left:0;margin:0}
.eg ol li{position:relative;padding-left:34px;margin:9px 0}
.eg ol li:before{counter-increment:st;content:counter(st);position:absolute;left:0;top:1px;
  width:24px;height:24px;border-radius:8px;background:var(--pri);color:#fff;display:grid;place-content:center;
  font-size:12.5px;font-weight:800}

.viz{margin:16px 0;padding:14px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--card);overflow-x:auto}
.viz svg{display:block;margin:0 auto;max-width:100%;height:auto}
.viz .cap{text-align:center;font-size:12.5px;color:var(--mut);margin-top:8px}
.viz .ctrl{display:flex;gap:10px;align-items:center;justify-content:center;margin-top:10px;flex-wrap:wrap;font-size:13px}
.viz input[type=range]{width:150px}

table.tb{width:100%;border-collapse:collapse;font-size:14.5px;margin:12px 0}
table.tb th,table.tb td{border:1px solid var(--line);padding:8px 11px;text-align:left}
table.tb th{background:var(--pri-soft);color:var(--pri);font-weight:800}
.tbwrap{overflow-x:auto}

.formula{background:var(--pri-soft);border-radius:var(--r-sm);padding:12px 16px;margin:12px 0;text-align:center;font-size:17px;overflow-x:auto}

/* ---------- Chọn mức luyện tập ---------- */
.tier{display:flex;align-items:center;gap:14px;padding:15px;border:2px solid var(--line);border-radius:var(--r);
      background:var(--card);cursor:pointer;transition:.15s;width:100%;text-align:left}
.tier:hover{border-color:var(--pri);transform:translateY(-2px)}
.tier .ic{width:46px;height:46px;border-radius:15px;display:grid;place-content:center;font-size:24px;flex:0 0 auto}
.tier .tt{flex:1;min-width:0}
.tier .tt b{display:block;font-size:15.5px;font-weight:800}
.tier .tt span{font-size:12.5px;color:var(--mut)}

/* ---------- Làm bài ---------- */
.quizbar{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.quizbar .bar{flex:1}
.quizbar .x{background:none;border:0;font-size:22px;color:var(--mut2);cursor:pointer;padding:0 4px}
.combo{font-weight:900;color:var(--warn);font-size:15px;white-space:nowrap}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh)}
.qstem{font-size:18px;font-weight:700;line-height:1.55;margin:0 0 18px}
.opt{display:flex;align-items:center;gap:12px;padding:14px 16px;border:2px solid var(--line);border-radius:15px;
     margin-bottom:11px;cursor:pointer;transition:.13s;background:var(--card);width:100%;text-align:left;font-size:15.5px}
.opt:hover:not(.locked){border-color:var(--pri);background:var(--pri-soft)}
.opt .k{width:30px;height:30px;border-radius:10px;background:var(--line);color:var(--mut);
        display:grid;place-content:center;font-weight:900;font-size:14px;flex:0 0 auto}
.opt.sel{border-color:var(--pri);background:var(--pri-soft)}
.opt.sel .k{background:var(--pri);color:#fff}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.right .k{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt.locked{cursor:default}
.fillbox{display:flex;gap:10px;flex-wrap:wrap}
.fillbox input{flex:1;min-width:180px;padding:14px 16px;border:2px solid var(--line);border-radius:14px;
               background:var(--card);font-size:17px;font-weight:700}
.fillbox input:focus{outline:0;border-color:var(--pri)}

.fb{border-radius:var(--r);padding:16px 18px;margin-top:16px;animation:pop .25s ease}
.fb.right{background:var(--ok-soft);border:2px solid var(--ok)}
.fb.wrong{background:var(--bad-soft);border:2px solid var(--bad)}
.fb h4{margin:0 0 6px;font-size:16.5px;font-weight:900}
.fb .exp{font-size:14.5px;line-height:1.6}
.fb .exp b{color:inherit}
@keyframes pop{from{transform:scale(.96);opacity:0}to{transform:scale(1);opacity:1}}

.hintbtn{background:none;border:0;color:var(--warn);font-weight:800;font-size:14px;cursor:pointer;padding:6px 0}
.hintbox{background:var(--warn-soft);border-radius:12px;padding:11px 14px;font-size:14.5px;margin:10px 0;
         border-left:4px solid var(--warn)}

/* ---------- Kết quả ---------- */
.result{text-align:center;padding:26px 20px}
.result .big{font-size:66px;line-height:1;margin-bottom:6px}
.result h2{font-size:27px;margin:6px 0;font-weight:900}
.result .stars{font-size:38px;letter-spacing:6px;margin:8px 0}
.result .msg{color:var(--mut);font-size:15.5px;max-width:440px;margin:0 auto 18px}
.scoreRing{width:132px;height:132px;margin:0 auto 12px}

.badgepop{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#fef3c7,#fde68a);
  border-radius:var(--r);padding:14px 16px;margin:10px 0;border:2px solid #f59e0b;color:#78350f}
.badgepop .bi{font-size:34px}
.badgepop b{display:block;font-size:15.5px}
.badgepop span{font-size:13px}

.badgegrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(112px,1fr));gap:12px}
.bdg{text-align:center;padding:14px 8px;border-radius:16px;border:2px solid var(--line);background:var(--card)}
.bdg .bi{font-size:32px;line-height:1.2}
.bdg b{display:block;font-size:12.5px;margin-top:5px;font-weight:800}
.bdg span{font-size:11px;color:var(--mut);line-height:1.35;display:block;margin-top:3px}
.bdg.locked{opacity:.42;filter:grayscale(1)}

/* ---------- Biểu đồ hoạt động ---------- */
.spark{display:flex;align-items:stretch;gap:6px;height:136px}
.spark .col{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%}
/* số XP ghi trên đầu cột — không có số thì biểu đồ chỉ còn mấy vạch xám khó hiểu */
.spark .col .v{font-size:10.5px;font-weight:800;color:var(--pri);line-height:1.2;min-height:13px}
.spark .col.zero .v{visibility:hidden}
/* khung cột, có đường nền phía dưới để các cột không bị "lơ lửng" */
.spark .col .bw{flex:1;width:100%;display:flex;align-items:flex-end;justify-content:center;
                border-bottom:2px solid var(--line)}
.spark .col i{display:block;width:100%;max-width:34px;border-radius:7px 7px 0 0;
              background:linear-gradient(180deg,var(--pri-2),var(--pri));min-height:4px;transition:height .5s}
.spark .col.zero i{background:var(--line);min-height:3px}
.spark .col span{font-size:11px;color:var(--mut);font-weight:700}
.spark .col.today span{color:var(--pri);font-weight:900}
.heat{display:grid;grid-template-columns:repeat(15,1fr);gap:4px}
.heat i{aspect-ratio:1;border-radius:4px;background:var(--line);display:block}

/* ---------- Biểu mẫu ---------- */
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;font-weight:700;color:var(--mut);margin-bottom:5px}
.field input,.field select,.field textarea{
  width:100%;padding:11px 13px;border:2px solid var(--line);border-radius:12px;background:var(--card);font-size:15px}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--pri)}
.field textarea{min-height:150px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px;line-height:1.55}
.seg{display:inline-flex;background:var(--line);border-radius:12px;padding:3px;gap:3px;flex-wrap:wrap}
.seg button{border:0;background:none;padding:8px 15px;border-radius:10px;font-weight:700;font-size:14px;cursor:pointer;color:var(--mut)}
.seg button.on{background:var(--card);color:var(--pri);box-shadow:var(--sh)}
.checks{display:flex;gap:14px;flex-wrap:wrap}
.checks label{display:flex;align-items:center;gap:7px;font-size:14.5px;font-weight:600}

/* ---------- Bảng ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--mut);
        padding:9px 10px;border-bottom:2px solid var(--line)}
.tbl td{padding:11px 10px;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl tr:last-child td{border-bottom:0}

/* ---------- Đăng nhập ---------- */
.login{min-height:100vh;display:grid;place-items:center;padding:24px;
       background:radial-gradient(1000px 600px at 50% -10%,#7c6cf5 0%,#4f46e5 40%,#312e81 100%)}
.login .box{background:var(--card);border-radius:26px;padding:30px 26px;width:100%;max-width:400px;box-shadow:var(--sh-lg)}
.login .logo{text-align:center;font-size:52px;line-height:1}
.login h1{text-align:center;font-size:25px;margin:6px 0 2px;font-weight:900;letter-spacing:-.5px}
.login p.tag{text-align:center;color:var(--mut);margin:0 0 22px;font-size:14px}
.who-list{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-bottom:18px}
.who-btn{border:2px solid var(--line);background:var(--card);border-radius:16px;padding:10px 14px;cursor:pointer;
         display:flex;align-items:center;gap:8px;font-weight:700;font-size:14px}
.who-btn.on{border-color:var(--pri);background:var(--pri-soft);color:var(--pri)}

/* ---------- Hiệu ứng ---------- */
#fx{position:fixed;inset:0;pointer-events:none;z-index:200;overflow:hidden}
.conf{position:absolute;width:10px;height:14px;border-radius:2px;animation:fall linear forwards}
@keyframes fall{to{transform:translateY(110vh) rotate(720deg);opacity:.1}}
.floatxp{position:fixed;font-weight:900;font-size:22px;color:var(--warn);z-index:210;pointer-events:none;
         animation:up 1.1s ease-out forwards;text-shadow:0 2px 8px rgba(0,0,0,.15)}
@keyframes up{to{transform:translateY(-70px);opacity:0}}
.shake{animation:shk .35s}
@keyframes shk{0%,100%{transform:translateX(0)}20%{transform:translateX(-8px)}40%{transform:translateX(8px)}60%{transform:translateX(-5px)}80%{transform:translateX(5px)}}

#toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(var(--nav-h) + 18px);z-index:300;
       display:flex;flex-direction:column;gap:8px;align-items:center;pointer-events:none}
.toast{background:#1c1e2b;color:#fff;padding:11px 18px;border-radius:14px;font-size:14.5px;font-weight:600;
       box-shadow:var(--sh-lg);animation:tin .3s;max-width:90vw}
.toast.bad{background:var(--bad)}
.toast.ok{background:var(--ok)}
@keyframes tin{from{transform:translateY(16px);opacity:0}}

/* ---------- Hộp thoại ---------- */
.modal{position:fixed;inset:0;background:rgba(15,17,30,.55);z-index:250;display:grid;place-items:center;padding:18px;
       animation:tin .2s;backdrop-filter:blur(2px)}
.modal .mbox{background:var(--card);border-radius:22px;padding:24px;width:100%;max-width:560px;max-height:88vh;overflow:auto;box-shadow:var(--sh-lg)}
.modal h3{margin:0 0 14px;font-size:19px;font-weight:800}

.empty{text-align:center;padding:40px 20px;color:var(--mut)}
.empty .ic{font-size:52px;margin-bottom:10px}

/* mascot */
.mascot{width:78px;height:78px;flex:0 0 auto}
.talkbox{display:flex;gap:14px;align-items:center;background:var(--pri-soft);border-radius:var(--r);padding:14px 16px}
.talkbox p{margin:0;font-size:14.7px;font-weight:600;line-height:1.5}

@media (max-width:520px){
  .topbar h1{font-size:21px}
  .card{padding:16px}
  .hero{padding:18px}
  .qcard{padding:16px}
  .qstem{font-size:16.5px}
}

/* ================= 🚀 TRÒ CHƠI BẮN THIÊN THẠCH ================= */
.gamehero{position:relative;border-radius:24px;overflow:hidden;margin-bottom:16px;
  background:linear-gradient(135deg,#0b1030,#2a1550 60%,#5b21b6);box-shadow:var(--sh-lg)}
.gh-stars{position:absolute;inset:0;opacity:.65;
  background-image:radial-gradient(1.6px 1.6px at 20% 30%,#fff,transparent),
    radial-gradient(1.4px 1.4px at 65% 18%,#fff,transparent),
    radial-gradient(1.8px 1.8px at 82% 62%,#fff,transparent),
    radial-gradient(1.2px 1.2px at 38% 78%,#fff,transparent),
    radial-gradient(1.5px 1.5px at 12% 66%,#fff,transparent),
    radial-gradient(1.3px 1.3px at 90% 34%,#fff,transparent)}
.gh-in{position:relative;display:flex;gap:16px;align-items:center;padding:24px;color:#fff}
.gh-ico{font-size:52px;line-height:1;animation:hover 2.6s ease-in-out infinite}
@keyframes hover{0%,100%{transform:translateY(0) rotate(-6deg)}50%{transform:translateY(-10px) rotate(6deg)}}
.gh-in h1{margin:0 0 4px;font-size:24px;font-weight:900;letter-spacing:-.5px}
.gh-in p{margin:0;font-size:14px;opacity:.9;line-height:1.5}

.podium{display:flex;gap:10px;align-items:flex-end;justify-content:center;margin-top:6px}
.pod{flex:1;max-width:150px;text-align:center;border-radius:16px;padding:14px 8px;
     background:var(--pri-soft);border:2px solid var(--line)}
.pod.p1{transform:translateY(-10px);border-color:#fbbf24;background:linear-gradient(180deg,#fef3c7,#fde68a)}
@media (prefers-color-scheme:dark){.pod.p1{background:linear-gradient(180deg,#3f2d0b,#4a3410)}}
.pod .medal{font-size:26px}.pod .pav{font-size:30px;line-height:1.2}
.pod b{display:block;font-size:13.5px;margin-top:2px}
.pod span{font-size:12px;color:var(--mut);font-weight:700}

.lvcard{display:block;width:100%;text-align:left;border:2px solid var(--line);border-left:6px solid var(--lc);
  border-radius:var(--r);background:var(--card);padding:16px;cursor:pointer;transition:.15s;box-shadow:var(--sh)}
.lvcard:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:var(--lc)}
.lv-top{display:flex;gap:12px;align-items:center}
.lv-ico{font-size:30px}
.lv-top b{display:block;font-size:16px;font-weight:800}
.lv-sub{display:block;font-size:12.5px;color:var(--mut);line-height:1.4;margin-top:2px}
.lv-meta{display:flex;gap:12px;flex-wrap:wrap;margin:10px 0 8px;font-size:12.5px;color:var(--mut);font-weight:600}
.lv-goal span{display:block;font-size:12px;color:var(--mut);margin-top:5px;font-weight:600}

.howto{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px}
.howto>div{background:var(--pri-soft);border-radius:14px;padding:12px 14px}
.howto b{font-size:14px}.howto p{margin:4px 0 0;font-size:13px;line-height:1.5;color:var(--mut)}

/* --- sân chơi --- */
.gstage{position:relative;border-radius:20px;overflow:hidden;background:#0b1030;box-shadow:var(--sh-lg)}
.ghud{display:flex;align-items:center;gap:12px;padding:10px 14px;background:rgba(6,8,24,.82);color:#fff}
.ghud .gx{background:none;border:0;color:#94a3b8;font-size:20px;cursor:pointer;padding:0 4px}
.ghud .glives{font-size:14px;letter-spacing:1px}
.ghud .gscore{margin-left:auto;font-weight:900;font-size:20px;color:#fde68a}
.ghud .gcombo{font-weight:900;color:#fb923c;min-width:52px;text-align:right;font-size:15px}
.gq{background:rgba(6,8,24,.9);color:#fff;padding:8px 16px 12px;text-align:center}
.gq-sub{font-size:11.5px;color:#a5b4fc;font-weight:700;text-transform:uppercase;letter-spacing:.6px}
.gq-stem{font-size:16px;font-weight:700;line-height:1.4;margin-top:3px}
.gtime{height:5px;background:rgba(255,255,255,.12)}
.gtime>i{display:block;height:100%;width:100%;background:linear-gradient(90deg,#38bdf8,#818cf8);transition:width .1s linear}
.gcanvas{display:block;width:100%;height:min(58vh,480px);touch-action:none;cursor:crosshair}

.gstats{display:grid;grid-template-columns:repeat(auto-fit,minmax(96px,1fr));gap:10px;margin:18px 0}
.gstat{background:var(--pri-soft);border-radius:14px;padding:10px 6px}
.gstat .gs-ic{font-size:20px}
.gstat b{display:block;font-size:19px;font-weight:900;line-height:1.2}
.gstat span{font-size:11.5px;color:var(--mut);font-weight:600}

/* --- bảng xếp hạng --- */
.brow{display:flex;align-items:center;gap:12px;padding:11px 10px;border-bottom:1px solid var(--line)}
.brow:last-child{border-bottom:0}
.brow.me{background:var(--pri-soft);border-radius:12px;border-bottom-color:transparent}
.brank{width:34px;height:34px;border-radius:11px;display:grid;place-content:center;flex:0 0 auto;
  font-weight:900;font-size:14px;background:var(--line);color:var(--mut)}
.brank.r1,.brank.r2,.brank.r3{background:transparent;font-size:22px}
.bav{font-size:26px;flex:0 0 auto}
.bscore{font-weight:900;font-size:18px;color:var(--pri);flex:0 0 auto}
@media (max-width:520px){
  .gh-in{padding:18px}.gh-ico{font-size:40px}.gh-in h1{font-size:20px}
  .gq-stem{font-size:14.5px}.gcanvas{height:min(56vh,420px)}
}

.quotabox{display:flex;gap:14px;align-items:center;margin-top:16px;border-left:6px solid var(--ok)}
.quotabox.out{border-left-color:var(--warn)}
.quotabox .qb-ic{font-size:30px}
.quotabox b{display:block;font-size:15px}
.quotabox p{margin:3px 0 0;font-size:13px;color:var(--mut);line-height:1.5}
.lvcard.locked{opacity:.66;filter:saturate(.5)}
.lvcard.locked:hover{transform:none;box-shadow:var(--sh)}
.lv-meta .ok{color:var(--ok)}.lv-meta .warn{color:#b45309}
.ghud .gfree{font-size:11px;font-weight:800;color:#fbbf24;background:rgba(251,191,36,.15);
  padding:3px 9px;border-radius:999px;white-space:nowrap}

/* ===== Mô phỏng thí nghiệm Vật lí ===== */
.viz.sim{background:linear-gradient(180deg,var(--card),var(--card));padding:14px 12px 12px}
.viz.sim canvas{box-shadow:inset 0 0 0 1px var(--line)}
.simctrl{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:8px 16px;margin-top:12px}
.simctrl label{display:flex;align-items:center;gap:8px;font-size:13px;flex-wrap:nowrap}
.simctrl label b{min-width:74px;font-size:12.5px;color:var(--mut)}
.simctrl input[type=range]{flex:1;min-width:80px;accent-color:var(--pri)}
.simctrl select{flex:1;padding:4px 6px;border:1px solid var(--line);border-radius:8px;background:var(--card);color:inherit;font-size:12.5px}
.simval{min-width:62px;text-align:right;font-weight:800;font-size:12.5px;color:var(--pri)}
.simbar{display:flex;gap:8px;justify-content:center;margin-top:12px}
.simbar .btn.sm{padding:6px 16px;font-size:13.5px}
.siminfo{margin-top:11px;padding:10px 12px;border-radius:10px;background:rgba(14,165,233,.09);
         font-size:14px;line-height:1.65;text-align:center}
.siminfo .small{font-size:12.5px;color:var(--mut)}
@media(max-width:560px){.simctrl{grid-template-columns:1fr}.siminfo{font-size:13px}}

/* ===== Luyện tập / Đề thi: thanh chọn môn ===== */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips .chip{cursor:pointer;border:1px solid var(--line);font-size:13.5px;padding:7px 14px;
             background:var(--card);color:var(--mut);transition:.15s}
.chips .chip:hover{border-color:var(--pri);color:var(--pri)}
.chips .chip.on{background:var(--pri);color:#fff;border-color:var(--pri);font-weight:800}

/* ===== Tách "Chương trình chuẩn" và "Chuyên đề học tập" ===== */
.tracksep{margin:26px 0 14px;padding:14px 16px;border-radius:var(--r-sm);
          background:linear-gradient(135deg,rgba(124,108,245,.14),rgba(14,165,233,.12));
          border:1px solid var(--line)}
.tracksep h2{margin:0 0 4px;font-size:19px}
.tracksep p{margin:0;font-size:13.5px;color:var(--mut);line-height:1.6}
/* ===== Hộp "Yêu cầu cần đạt" trích từ Chương trình GDPT 2018 ===== */
details.yccd{margin:12px 0 4px;border:1px dashed var(--line);border-radius:12px;
             background:rgba(16,163,74,.06);padding:10px 14px}
details.yccd summary{cursor:pointer;font-weight:800;font-size:13.5px;color:var(--ok)}
details.yccd ul{margin:10px 0 4px;padding-left:20px;font-size:13.5px;line-height:1.65;color:var(--mut)}
details.yccd li{margin-bottom:5px}

/* ══════════════ Hộp tìm kiếm bài học (Trang chủ) ══════════════ */
.searchcard { margin-top: 16px; padding: 14px 16px; }
.searchbar {
  display: flex; align-items: center; gap: 10px;
  border: 2px solid var(--line); border-radius: 14px;
  padding: 4px 12px; background: var(--bg);
  transition: border-color .15s, box-shadow .15s;
}
.searchbar:focus-within { border-color: var(--pri); box-shadow: 0 0 0 4px rgba(91, 91, 214, .12); }
.searchic { font-size: 18px; opacity: .75; }
.searchinput {
  flex: 1; border: 0; outline: 0; background: transparent;
  font: inherit; font-size: 16px; padding: 11px 0; color: var(--txt);
}
.searchinput::-webkit-search-cancel-button { display: none; }
.searchclr {
  border: 0; background: var(--line); color: var(--txt);
  width: 26px; height: 26px; border-radius: 50%; cursor: pointer;
  font-size: 13px; line-height: 1; flex: none;
}
.searchclr:hover { background: var(--bad); color: #fff; }

.searchres { margin-top: 10px; }
.shint { font-size: 13px; color: var(--mut); margin: 10px 2px 6px; }
.skws { display: flex; flex-wrap: wrap; gap: 8px; }
.skw {
  border: 1.5px solid var(--line); background: var(--card); color: var(--txt);
  border-radius: 999px; padding: 7px 13px; font-size: 13.5px; cursor: pointer;
  font-family: inherit;
}
.skw:hover { border-color: var(--pri); color: var(--pri); }

.sres {
  display: flex; align-items: flex-start; gap: 11px; width: 100%; text-align: left;
  border: 0; border-top: 1px solid var(--line); background: transparent;
  padding: 11px 6px; cursor: pointer; font-family: inherit; border-radius: 10px;
}
.sres:first-of-type { border-top: 0; }
.sres:hover { background: var(--bg); }
.sdot {
  flex: none; width: 34px; height: 34px; border-radius: 10px;
  display: grid; place-items: center; font-size: 17px; color: #fff;
}
.sbody { flex: 1; min-width: 0; display: block; }
.st { display: block; font-weight: 800; font-size: 15px; color: var(--txt); }
.stag {
  font-style: normal; font-size: 11px; font-weight: 700; margin-left: 7px;
  padding: 2px 7px; border-radius: 999px; background: var(--line); color: var(--mut);
  vertical-align: middle;
}
.stag.ok { background: var(--ok-soft); color: var(--ok); }
.smeta { display: block; font-size: 12.5px; color: var(--mut); margin-top: 2px; }
.ssnip {
  display: block; font-size: 12.5px; color: var(--mut); margin-top: 4px;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; opacity: .85;
}
.sgo { flex: none; color: var(--mut); font-size: 16px; align-self: center; }
.sempty { padding: 14px 4px; color: var(--mut); font-size: 14px; }
.sempty b { display: block; color: var(--txt); margin-bottom: 4px; }
.sempty p { margin: 0; }

@media (max-width: 560px) {
  .ssnip { display: none; }
  .searchinput { font-size: 15px; }
}

/* ---- huy hiệu số lời mời trên thanh điều hướng ---- */
.navdot{margin-left:auto;min-width:20px;height:20px;padding:0 6px;border-radius:999px;
        background:var(--bad);color:#fff;font-size:12px;font-weight:800;
        display:inline-flex;align-items:center;justify-content:center}

/* ---- ảnh / video / âm thanh minh hoạ trong bài học ---- */
.media{margin:20px 0;padding:0}
.media img,.media video{display:block;width:100%;height:auto;max-height:460px;object-fit:contain;
  border-radius:14px;background:var(--bg);border:1px solid var(--line)}
.media audio{width:100%;margin:6px 0}
.media figcaption{margin-top:8px;font-size:13.5px;color:var(--mut);line-height:1.5}
.media .credit{display:block;margin-top:3px;font-size:12.5px;color:var(--mut);opacity:.85}
.media .credit a{color:var(--mut);text-decoration:underline}
.media.miss{border:1px dashed var(--line);border-radius:14px;padding:18px;text-align:center}
.media.miss .ph{font-size:34px;opacity:.5}
.pxgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-top:14px}
.pxcard{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--card);
  display:flex;flex-direction:column}
.pxcard img{width:100%;height:110px;object-fit:cover;display:block;background:var(--bg)}
.pxcard .m{padding:8px;font-size:12px;color:var(--mut);flex:1}
.pxcard button{margin:0 8px 8px}

/* ---- lối tắt ở trang chủ (đặc biệt hữu ích trên điện thoại, nơi thanh bên bị ẩn) ---- */
.quicklinks{display:flex;gap:10px;margin-top:14px;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}
.quicklinks a{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;gap:4px;
  min-width:84px;padding:12px 10px;border:1px solid var(--line);border-radius:14px;
  background:var(--card);color:var(--txt);text-decoration:none;font-size:13px;font-weight:700}
.quicklinks a:hover{border-color:var(--pri);color:var(--pri)}
.quicklinks a .ic{font-size:22px;line-height:1}

/* ---- thanh chuyển môn ở đầu trang Học bài / Luyện tập / Đề thi ---- */
.subjbar{display:flex;gap:8px;overflow-x:auto;padding:0 0 6px;margin-bottom:14px;-webkit-overflow-scrolling:touch}
.subjpick{flex:0 0 auto;display:flex;align-items:center;gap:6px;padding:8px 14px;border-radius:999px;
  border:1.5px solid var(--line);background:var(--card);color:var(--mut);
  font-size:14px;font-weight:700;cursor:pointer;white-space:nowrap}
.subjpick:hover{border-color:var(--pri);color:var(--pri)}
.subjpick.on{border-width:2px;background:var(--pri-soft);color:var(--pri)}
.subjpick .ic{font-size:17px;line-height:1}
/* trên màn hình hẹp, các nút phụ của topbar xuống hàng riêng cho khỏi chật */
@media (max-width:560px){
  .topbar{flex-direction:column;align-items:stretch}
  .topbar > .row{width:100%}
  .topbar > .row > .btn{flex:1}
}

/* ---- nút gửi lời nhắn cho phụ huynh: màu riêng để không lẫn với nút tím ---- */
.btn.love{background:linear-gradient(135deg,#fb7185,#e11d48);box-shadow:0 5px 0 #9f1239;color:#fff}
.btn.love.sm{box-shadow:0 3px 0 #9f1239}
.btn.love:active{box-shadow:0 2px 0 #9f1239}

/* ---- bảng xếp hạng và thống kê theo môn ở màn hình phụ huynh ---- */
.lbrow{display:flex;align-items:center;gap:10px;padding:8px 6px;border-top:1px solid var(--line)}
.lbrow.mine{background:var(--pri-soft);border-radius:10px;border-top-color:transparent}
.lbrank{min-width:26px;text-align:center;font-weight:900;font-size:15px;color:var(--mut)}
.subjrow{display:flex;align-items:center;gap:10px;padding:7px 4px;border-top:1px solid var(--line)}
.subjrow .ic{font-size:20px;line-height:1}

/* ---- hộp "Cập nhật thực tế": thông tin đã đổi ngoài đời nhưng SGK chưa in kịp ---- */
.box.capnhat{background:linear-gradient(135deg,#eef6ff,#e6f0ff);border-left:5px solid #2563eb}
.box.capnhat .lbl{color:#1d4ed8}
@media (prefers-color-scheme:dark){
  .box.capnhat{background:linear-gradient(135deg,#12233f,#151f3a)}
  .box.capnhat .lbl{color:#93c5fd}
}

/* ---- thẻ video bài giảng ---- */
.vidbox{position:relative;width:100%;aspect-ratio:16/9;border-radius:12px;overflow:hidden;
  background:linear-gradient(135deg,#1e1b4b,#312e81)}
.vidbox iframe{width:100%;height:100%;border:0;display:block}
.vidplay{position:absolute;inset:0;width:100%;height:100%;border:0;cursor:pointer;
  background:transparent;color:#fff;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:8px}
.vidplay .tri{width:58px;height:58px;border-radius:50%;background:rgba(255,255,255,.18);
  border:2px solid rgba(255,255,255,.75);display:grid;place-items:center;font-size:22px;padding-left:4px}
.vidplay:hover .tri{background:rgba(255,255,255,.3)}
.vidplay .src{font-size:12.5px;font-weight:700;opacity:.85}

/* ---- bản đồ kiến thức của chương ---- */
.kmap{margin-top:4px}
.kmhub{display:flex;gap:14px;align-items:center;padding:16px 18px;border:2px solid;border-radius:18px;
  background:var(--card);box-shadow:var(--sh);margin-bottom:18px}
.kmhub .ic{width:52px;height:52px;flex:none;border-radius:14px;display:grid;place-items:center;
  font-size:26px;color:#fff}
.kmhub>div>b{font-size:18px;display:block}
.kmhub p{margin:4px 0 0;color:var(--mut);font-size:14.5px;line-height:1.55}
.kmhub p b{display:inline;font-size:inherit;color:var(--txt)}
.kmgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px}
.kmbr{border:1px solid var(--line);border-top:4px solid var(--bc);border-radius:14px;
  background:var(--card);padding:14px 16px 8px}
.kmbr-h{display:flex;align-items:center;gap:8px;margin-bottom:10px}
.kmbr-h .n{width:22px;height:22px;flex:none;border-radius:50%;background:var(--bc);color:#fff;
  background:color-mix(in srgb,var(--bc) 68%,#101033);
  font-size:12px;font-weight:800;display:grid;place-items:center}
.kmbr-h .ic{font-size:18px;line-height:1}
.kmbr-h b{font-size:15.5px;color:var(--bc);
  color:color-mix(in srgb,var(--bc) 68%,#101033)}   /* màu nhánh nhạt thì làm chữ khó đọc */
.kmit{padding:7px 0;border-top:1px dashed var(--line)}
.kmit:first-of-type{border-top:0}
.kmit>b{display:block;font-size:14.5px;font-weight:700}
.kmit span b{color:var(--txt)}
.kmit span{display:block;font-size:13.5px;color:var(--mut);line-height:1.5;margin-top:2px}
@media print{
  .side,.tabbar,.topbar button,.topbar a{display:none!important}
  .kmbr,.kmhub,.box{break-inside:avoid;box-shadow:none}
  .kmgrid{grid-template-columns:repeat(2,1fr)}
  body{background:#fff}
}

/* ---- kệ thư mục (Kiến thức lõi · Học bài · Luyện tập · Đề thi) ---- */
.foldergrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:16px;margin-top:4px}
.folder{position:relative;border:0;padding:0;background:none;cursor:pointer;text-align:left;
  filter:drop-shadow(0 4px 10px rgba(30,30,80,.10))}
.folder .tab{height:14px;width:52%;border-radius:10px 10px 0 0;background:var(--fc);opacity:.9}
.folder .body{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--fc);
  border-radius:0 14px 14px 14px;padding:14px 14px 12px;min-height:132px;
  display:flex;flex-direction:column;gap:2px;transition:.14s}
.folder:hover .body{transform:translateY(-3px);border-color:var(--fc)}
.folder .ic{font-size:34px;line-height:1.1;margin-bottom:4px}
.folder b{font-size:15.5px;color:var(--txt);line-height:1.3}
.folder .n{font-size:12.5px;font-weight:800;color:var(--fc);
  color:color-mix(in srgb,var(--fc) 65%,#101033)}
.folder .peek{font-size:12px;color:var(--mut);line-height:1.45;margin-top:4px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
@media (max-width:520px){.foldergrid{grid-template-columns:repeat(2,1fr);gap:12px}
  .folder .ic{font-size:28px}.folder b{font-size:14px}.folder .body{min-height:118px}}

/* ---- thư mục môn ở trang Học bài: thêm phần trăm và thanh tiến độ ---- */
.folder .fpct{font-size:12px;font-weight:800;color:var(--fc);background:var(--bg);
  color:color-mix(in srgb,var(--fc) 65%,#101033);border-radius:999px;padding:2px 8px;flex:none}
.folder .bar{margin:6px 0 2px}
.folder .bar i{background:var(--fc)}

/* ---- trang Tiến trình: bốn con số tổng quan (KHÔNG dùng .stats — trùng với .hero .stats) ---- */
.pgstats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.pgstats>div{background:var(--bg);border-radius:12px;padding:12px 8px 10px;text-align:center}
.pgstats .v{font-size:26px;font-weight:900;line-height:1.15;color:var(--txt)}
.pgstats .k{font-size:12.5px;color:var(--mut);margin-top:2px}
.pgstats .dl{font-size:11.5px;font-weight:800;margin-top:5px}
.pgstats .dl.ok{color:var(--ok)}.pgstats .dl.bad{color:var(--bad)}.pgstats .dl.mut{color:var(--mut)}
@media (max-width:600px){.pgstats{grid-template-columns:repeat(2,1fr)}.pgstats .v{font-size:22px}}

/* chân bản đồ nhiệt: mốc ngày hai đầu + thang màu ở giữa */
.heatfoot{display:flex;align-items:center;gap:10px;margin-top:9px}
.heatfoot .lg{flex:1;display:flex;align-items:center;justify-content:center;gap:4px}
.heatfoot .lg i{width:11px;height:11px;border-radius:3px;display:block}

/* ---- trang Tiến trình: từng môn, bấm để mở các chương ---- */
.pgs{display:flex;flex-direction:column;gap:10px}
.pgsub{border:1px solid var(--line);border-radius:13px;overflow:hidden;transition:.14s}
.pgsub:hover{border-color:var(--fc)}
.pgsub-h{display:flex;align-items:center;gap:11px;width:100%;padding:11px 13px;
  background:none;border:0;cursor:pointer;text-align:left;font:inherit;color:var(--txt)}
.pgsub-h .ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  font-size:17px;flex:none}
.pgsub-h .mid{flex:1;min-width:0;display:block}
.pgsub-h .mid>b{display:block;font-size:14.5px;margin-bottom:5px}
.pgsub-h .mid .bar{margin:0 0 4px}
.pgsub-h .mid .bar i{background:var(--fc)}
.pgsub-h .ar{color:var(--mut);font-size:20px;flex:none;transition:.15s;line-height:1}
.pgsub.open .ar{transform:rotate(90deg)}
.pgsub.open{border-color:var(--fc)}
.pgsub-b{display:none;padding:2px 13px 12px;border-top:1px dashed var(--line);margin:0 0 0}
.pgsub.open .pgsub-b{display:block}
.pgch{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--line)}
.pgch:last-child{border-bottom:0}
.pgch .ic{font-size:16px;flex:none;width:22px;text-align:center}
.pgch .mid{flex:1;min-width:0}
.pgch .mid b{display:block;font-size:13.5px;font-weight:700;margin-bottom:4px;line-height:1.35}
.pgch .mid .bar i{background:var(--fc)}
.pgch .chip{flex:none}
@media (max-width:560px){.pgsub-h{gap:9px;padding:10px}.pgch .chip{font-size:11px;padding:2px 7px}}

/* lịch sử làm bài: chỉ hiện 10 dòng đầu cho tới khi bấm "Xem thêm" */
.tbl tr.more{display:none}
.tbl.showall tr.more{display:table-row}
.folder .n.alt{color:var(--mut);font-weight:700}

/* ================= 🧭 TRANG HƯỚNG DẪN HỌC VÀ CHƠI ================= */
.hdhero{position:relative;overflow:hidden;border-radius:20px;padding:24px 22px;margin-bottom:18px;
  background:linear-gradient(135deg,#5b5bd6,#8b5cf6 55%,#e11d48);color:#fff}
.hdhero .hd-bg{position:absolute;inset:0;pointer-events:none;opacity:.5;
  background:radial-gradient(circle at 12% 20%,rgba(255,255,255,.35) 0 2px,transparent 3px),
             radial-gradient(circle at 78% 30%,rgba(255,255,255,.3) 0 2px,transparent 3px),
             radial-gradient(circle at 42% 78%,rgba(255,255,255,.25) 0 2px,transparent 3px),
             radial-gradient(circle at 92% 72%,rgba(255,255,255,.3) 0 2px,transparent 3px),
             radial-gradient(circle at 25% 55%,rgba(255,255,255,.22) 0 1.5px,transparent 3px)}
.hdhero .hd-in{position:relative;display:flex;align-items:center;gap:18px}
.hdhero .hd-ic{font-size:52px;line-height:1;flex:none;filter:drop-shadow(0 4px 8px rgba(0,0,0,.25))}
.hdhero h1{margin:0 0 6px;font-size:27px;color:#fff}
.hdhero p{margin:0;font-size:14.5px;line-height:1.6;opacity:.95}
@media (max-width:560px){.hdhero{padding:20px 16px}.hdhero .hd-ic{font-size:40px}.hdhero h1{font-size:22px}}

.hdsec{margin-top:18px}
.hdsec-h{display:flex;align-items:flex-start;gap:12px;margin-bottom:14px}
.hdsec-h .ic{font-size:26px;line-height:1.1;flex:none}
.hdsec-h h2{margin:0 0 3px}
.hdsec-h p{margin:0;font-size:13px;color:var(--mut)}

/* bốn bước bắt đầu */
.hdsteps{display:flex;flex-direction:column;gap:10px}
.hdstep{display:flex;align-items:center;gap:13px;padding:12px 14px;border:1px solid var(--line);
  border-radius:13px;background:var(--bg)}
.hdstep .no{width:30px;height:30px;border-radius:50%;background:var(--pri);color:#fff;flex:none;
  display:grid;place-items:center;font-weight:900;font-size:15px}
.hdstep .tx{flex:1;min-width:0}
.hdstep .tx b{display:block;font-size:14.5px;margin-bottom:2px}
.hdstep .tx p{margin:0;font-size:13px;color:var(--mut);line-height:1.5}

/* bản đồ các mục */
.hdrooms{display:grid;grid-template-columns:repeat(auto-fill,minmax(215px,1fr));gap:12px}
.hdroom{text-align:left;border:1px solid var(--line);border-radius:14px;padding:14px;background:var(--card);
  cursor:pointer;display:flex;flex-direction:column;gap:4px;transition:.14s;font:inherit;color:var(--txt)}
.hdroom:hover{border-color:var(--pri);transform:translateY(-2px);box-shadow:0 6px 16px rgba(30,30,80,.09)}
.hdroom .ic{font-size:26px;line-height:1.2}
.hdroom b{font-size:15px}
.hdroom>span:last-child{font-size:12.5px;color:var(--mut);line-height:1.5}

/* vòng học một bài */
.hdflow{display:flex;align-items:stretch;gap:8px;flex-wrap:wrap}
.hdflow .ar{align-self:center;color:var(--mut);font-size:20px;font-weight:900;flex:none}
.hdfl{flex:1 1 140px;border:1px solid var(--line);border-top:3px solid var(--fc);border-radius:12px;
  padding:13px 13px 14px;display:flex;flex-direction:column;gap:3px;background:var(--card)}
.hdfl .ic{font-size:23px;line-height:1.2}
.hdfl b{font-size:14.5px;color:var(--fc)}
.hdfl>span:last-child{font-size:12.5px;color:var(--mut);line-height:1.5}
@media (max-width:900px){.hdflow{display:grid;grid-template-columns:repeat(2,1fr)}.hdflow .ar{display:none}}
@media (max-width:520px){.hdflow{grid-template-columns:1fr}}

/* thang cấp bậc */
.hdlad{display:flex;flex-direction:column;gap:6px}
.hdrk{display:flex;align-items:center;gap:11px;padding:9px 13px;border-radius:11px;
  border:1px solid var(--line);opacity:.55}
.hdrk.got{opacity:1;background:var(--bg)}
.hdrk.now{border-color:var(--pri);border-width:2px;background:var(--pri-soft)}
.hdrk .ic{font-size:20px;flex:none;width:26px;text-align:center}
.hdrk b{flex:1;min-width:0;font-size:14.5px}
.hdrk .xp{font-size:12.5px;font-weight:800;color:var(--mut);flex:none}

/* luật chơi */
.hdrules{display:flex;flex-direction:column;gap:11px}
.hdrule{display:flex;gap:12px;align-items:flex-start}
.hdrule .ic{font-size:22px;flex:none;width:28px;text-align:center;line-height:1.3}
.hdrule b{display:block;font-size:14.5px;margin-bottom:2px}
.hdrule p{margin:0;font-size:13px;color:var(--mut);line-height:1.55}

/* mẹo học */
.hdtips{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
.hdtip{border:1px solid var(--line);border-radius:13px;padding:14px;background:var(--bg);
  display:flex;flex-direction:column;gap:3px}
.hdtip .ic{font-size:23px;line-height:1.2}
.hdtip b{font-size:14.5px}
.hdtip>span:last-child{font-size:12.5px;color:var(--mut);line-height:1.55}

/* hỏi đáp */
.hdfaq{display:flex;flex-direction:column;gap:8px}
.hdq{border:1px solid var(--line);border-radius:12px;overflow:hidden}
.hdq-h{display:flex;align-items:center;gap:10px;width:100%;padding:12px 14px;background:none;border:0;
  cursor:pointer;text-align:left;font:inherit;font-weight:800;font-size:14.5px;color:var(--txt)}
.hdq-h .mid{flex:1;min-width:0}
.hdq-h .ar{color:var(--mut);font-size:19px;flex:none;transition:.15s;line-height:1}
.hdq.open .ar{transform:rotate(90deg)}
.hdq.open{border-color:var(--pri)}
.hdq-b{display:none;padding:0 14px 13px}
.hdq.open .hdq-b{display:block}
.hdq-b p{margin:0;font-size:13.5px;color:var(--mut);line-height:1.65}

/* lời kết */
.hdend{margin-top:18px;text-align:center;padding:26px 20px;border-radius:18px;
  background:var(--pri-soft);border:1px solid var(--line)}
.hdend .ic{font-size:40px;line-height:1}
.hdend h2{margin:8px 0 6px}
.hdend p{margin:0 auto;max-width:520px;font-size:14px;color:var(--mut);line-height:1.65}

/* ================= 🚀 TRANG CHÍNH TRÒ CHƠI ================= */
/* Tên lớp riêng cho màn hình này: lb- (bảng xếp hạng), lv- (cấp độ), gtip- (mẹo chơi). */

/* ---- bảng xếp hạng trên trang chính ---- */
.lbcard{margin-top:16px;overflow:hidden}
.lbcard .podium{margin-top:14px}
.pod.me{outline:2px solid var(--pri);outline-offset:2px}
.lbrest{margin-top:14px;border-top:1px dashed var(--line);padding-top:6px}
.lbr{display:flex;align-items:center;gap:11px;padding:8px 8px;border-radius:10px}
.lbr+.lbr{border-top:1px solid var(--line)}
.lbr .no{width:26px;flex:none;text-align:center;font-weight:900;font-size:13.5px;color:var(--mut)}
.lbr .av{font-size:20px;flex:none;line-height:1}
.lbr b{flex:1;min-width:0;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lbr .sc{font-weight:900;font-size:14.5px;color:var(--pri);flex:none}
.lbr.me{background:var(--pri-soft);border-top-color:transparent}

/* dòng "vị trí của con" — luôn ở cuối bảng, tô nổi để nhìn phát thấy ngay */
.lbme{display:flex;align-items:center;gap:12px;margin-top:14px;padding:13px 14px;border-radius:14px;
  background:linear-gradient(135deg,#5b5bd6,#8b5cf6);color:#fff}
.lbme.in{background:linear-gradient(135deg,#f59e0b,#e11d48)}
.lbme.new{background:linear-gradient(135deg,#0ea5e9,#5b5bd6)}
.lbme .no{font-weight:900;font-size:17px;flex:none;background:rgba(255,255,255,.22);
  border-radius:999px;padding:4px 11px}
.lbme .av{font-size:26px;flex:none;line-height:1}
.lbme b{display:block;font-size:14.5px}
.lbme>div>span{display:block;font-size:12.5px;opacity:.92;line-height:1.45;margin-top:2px}
.lbme .sc{font-weight:900;font-size:19px;flex:none}
@media (max-width:520px){.lbme{gap:9px;padding:11px}.lbme .sc{font-size:16px}}

/* ---- danh sách cấp độ dạng bảng ngang ---- */
.lvlist{display:flex;flex-direction:column;gap:10px}
.lvrow{display:grid;grid-template-columns:74px minmax(150px,1.5fr) auto minmax(90px,1fr) minmax(140px,1.1fr) 82px;
  gap:14px;align-items:center;padding:12px 14px;background:var(--card);cursor:pointer;
  border:1px solid var(--line);border-left:6px solid var(--lc);border-radius:14px;transition:.14s}
.lvrow:hover{border-color:var(--lc);transform:translateX(3px);box-shadow:var(--sh)}
.lvrow.locked,.lvrow.thin{opacity:.62;filter:saturate(.45)}
.lvrow.locked:hover,.lvrow.thin:hover{transform:none;box-shadow:none}
.lv-n{text-align:center}
.lv-n .ic{display:block;font-size:26px;line-height:1.15}
.lv-n i{display:block;font-style:normal;font-size:11px;font-weight:800;color:var(--lc);margin-top:2px;
  color:color-mix(in srgb,var(--lc) 66%,#101033)}   /* màu cấp độ nhạt thì làm chữ khó đọc */
.lv-name b{display:block;font-size:15.5px;line-height:1.25}
.lv-name span{display:block;font-size:12.5px;color:var(--mut);line-height:1.45;margin-top:3px}
.lv-stat{display:flex;gap:9px;font-size:12.5px;font-weight:700;color:var(--mut);white-space:nowrap}
.lv-stat .ok{color:var(--ok)}.lv-stat .warn{color:#b45309}
.lv-subj{font-size:12px;color:var(--mut);font-weight:600;line-height:1.4}
.lv-best span{display:block;font-size:11.5px;color:var(--mut);font-weight:700;margin-top:5px}
.lv-best .bar i{background:var(--lc)}

/* nút PLAY — để các con hiểu ngay là bấm vào đây thì chơi */
.playbtn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;
  width:100%;padding:10px 4px;border:0;border-radius:12px;cursor:pointer;font:inherit;
  background:linear-gradient(135deg,var(--lc),color-mix(in srgb,var(--lc) 62%,#101033));
  color:#fff;font-size:17px;line-height:1;box-shadow:0 4px 0 rgba(20,20,60,.28);transition:.12s}
.playbtn i{font-style:normal;font-size:10.5px;font-weight:900;letter-spacing:1px}
.playbtn:hover{filter:brightness(1.08)}
.playbtn:active{transform:translateY(3px);box-shadow:0 1px 0 rgba(20,20,60,.28)}
.lvrow.locked .playbtn,.lvrow.thin .playbtn{background:var(--line);color:var(--mut);box-shadow:none}

@media (max-width:920px){
  .lvrow{grid-template-columns:64px 1fr 78px;grid-template-areas:"n name play" "n stat play" "n best play";
    row-gap:6px;column-gap:12px}
  .lv-n{grid-area:n}.lv-name{grid-area:name}.lv-stat{grid-area:stat}.lv-best{grid-area:best}
  .playbtn{grid-area:play}
  .lv-subj{display:none}
}
@media (max-width:430px){
  .lvrow{grid-template-columns:52px 1fr 66px;gap:9px;padding:11px}
  .lv-n .ic{font-size:22px}.lv-name b{font-size:14px}
}

/* ---- mẹo chơi ---- */
.gtipgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(235px,1fr));gap:12px}
.gtipc{border:1px solid var(--line);border-radius:13px;padding:13px 14px;background:var(--bg);
  display:flex;flex-direction:column;gap:3px}
.gtipc .ic{font-size:22px;line-height:1.2}
.gtipc b{font-size:14px;line-height:1.35}
.gtipc>span:last-child{font-size:12.5px;color:var(--mut);line-height:1.5}