/* FlyEnglish – giao diện học tập (mobile-first) */
:root{
  --bg:#0b3b3f;
  --bg2:#062427;
  --txt:#eafcf9;
  --muted:#5f7f81;
  --ink:#0d2b2f;
  --card:#fbfffe;
  --line:rgba(255,255,255,.14);
  --coral:#ff7b54;
  --coral-d:#d9552f;
  --sun:#ffd34d;
  --sun-d:#c99a12;
  --mint:#4fd6b8;
  --mint-d:#2a9f88;
  --bad:#ff5d73;
  --ok:#35c979;
  --shadow:#04171b;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:'Nunito',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  color:var(--txt);
  min-height:100vh;
  overflow-x:hidden;
  background:
    radial-gradient(circle at 12% 8%, rgba(255,211,77,.13), transparent 38%),
    radial-gradient(circle at 92% 34%, rgba(79,214,184,.15), transparent 42%),
    radial-gradient(circle at 40% 96%, rgba(255,123,84,.10), transparent 40%),
    linear-gradient(180deg,#0c4046 0%, #082e33 55%, #062427 100%);
  background-attachment:fixed;
}
a{color:inherit}
button,input,select{font-family:inherit}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}

/* trang trí nền */
.deco{position:fixed;inset:0;pointer-events:none;overflow:hidden;z-index:0}
.deco i{position:absolute;display:block;border-radius:50%;background:rgba(255,255,255,.035)}
.deco i:nth-child(1){width:260px;height:260px;left:-80px;top:-60px}
.deco i:nth-child(2){width:140px;height:140px;right:-40px;top:22%;background:rgba(255,211,77,.05)}
.deco i:nth-child(3){width:90px;height:90px;left:12%;top:48%;background:rgba(79,214,184,.06)}
.deco i:nth-child(4){width:200px;height:200px;right:-90px;bottom:-40px;background:rgba(255,123,84,.05)}
.deco i:nth-child(5){width:44px;height:44px;left:70%;top:12%;background:rgba(255,255,255,.05)}
.deco i:nth-child(6){width:24px;height:24px;left:6%;bottom:18%;background:rgba(255,211,77,.10)}

#app{position:relative;z-index:1;max-width:560px;margin:0 auto}

/* thanh trên */
.topbar{
  position:sticky;top:0;z-index:10;
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:10px 14px;
  background:rgba(6,36,39,.92);
  backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;min-width:0;flex:1 1 auto;overflow:hidden}
.brand svg{flex:0 0 auto}
.brand-name{font:800 20px/1 'Baloo 2',sans-serif;letter-spacing:.2px}
.brand-name span{color:var(--sun)}
.brand-sub{font-size:11px;opacity:.72;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:190px;margin-top:2px}
.top-right{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.brand > div{min-width:0}
.booksel{
  appearance:none;-webkit-appearance:none;
  background-color:rgba(255,255,255,.1);color:var(--txt);
  border:2px solid var(--line);border-radius:14px;
  padding:7px 26px 7px 11px;font:800 13px 'Baloo 2',sans-serif;cursor:pointer;
  background-image:linear-gradient(45deg,transparent 50%,var(--sun) 50%),linear-gradient(135deg,var(--sun) 50%,transparent 50%);
  background-position:calc(100% - 13px) 55%,calc(100% - 8px) 55%;
  background-size:5px 5px;background-repeat:no-repeat;
}
.booksel option{color:#12333a}
.chip-stat{background:rgba(255,211,77,.15);color:var(--sun);font:800 14px 'Baloo 2',sans-serif;border-radius:14px;padding:7px 10px;white-space:nowrap}

/* khung trang */
.page{padding:14px 16px 118px}
.page-title{margin:4px 0 6px}
.page-title h2{margin:0;font:800 28px/1.1 'Baloo 2',sans-serif}
.page-title .sub{color:rgba(234,252,249,.78);margin:4px 0 0}
.sub{color:var(--muted);margin:0;font-size:14px;line-height:1.45}
.muted{color:var(--muted)}

.card{
  background:var(--card);color:var(--ink);
  border-radius:22px;padding:18px;margin:12px 0;
  box-shadow:0 6px 0 var(--shadow),0 14px 30px rgba(0,0,0,.22);
}
.card h3{margin:0 0 10px;font:800 19px/1.2 'Baloo 2',sans-serif}
.card ul.rules{margin:0;padding-left:20px}
.card ul.rules li{margin:7px 0;line-height:1.5}

/* nút */
.btn{
  display:inline-block;text-align:center;text-decoration:none;
  font:800 16px/1.2 'Baloo 2',sans-serif;color:#fff;
  border:0;border-radius:16px;padding:12px 18px;cursor:pointer;
  transition:transform .06s ease, box-shadow .06s ease;
}
.btn:active{transform:translateY(3px)}
.btn:disabled{opacity:.5;cursor:default;transform:none}
.btn.primary{background:var(--coral);box-shadow:0 5px 0 var(--coral-d)}
.btn.sun{background:var(--sun);color:#3a2a00;box-shadow:0 5px 0 var(--sun-d)}
.btn.mint{background:var(--mint);color:#06302a;box-shadow:0 5px 0 var(--mint-d)}
.btn.ghost{background:rgba(255,255,255,.1);color:var(--txt);border:2px solid var(--line);box-shadow:none}
.btn.wide{display:block;width:100%}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.actions .btn{flex:1 1 auto}
.back{display:inline-block;color:var(--txt);text-decoration:none;font:800 15px 'Baloo 2',sans-serif;margin:4px 0 6px;opacity:.9}

/* hero */
.hero{
  display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;
  background:linear-gradient(135deg,#ff9166 0%,#ff6a4d 100%);color:#fff;
  border-radius:26px;padding:18px 16px 18px 18px;margin-top:6px;
  box-shadow:0 8px 0 #9c3418,0 16px 30px rgba(0,0,0,.25);
}
.hero .eyebrow{font:800 11px 'Nunito',sans-serif;letter-spacing:.08em;text-transform:uppercase;opacity:.92}
.hero h2{margin:6px 0 2px;font:800 26px/1.12 'Baloo 2',sans-serif;word-break:break-word}
.hero .hp{margin:0;font-size:14px;opacity:.95}
.hero .btn{margin-top:12px}
.bar{height:12px;background:rgba(255,255,255,.32);border-radius:8px;overflow:hidden;margin:10px 0 0}
.bar i{display:block;height:100%;background:var(--sun);border-radius:8px;transition:width .4s ease}
.hero-mascot{width:96px;height:96px;display:grid;place-items:center}

/* lộ trình học */
.path{padding:6px 0 10px}
.prow{display:flex;align-items:center;gap:12px;margin:12px 0}
.prow.l{flex-direction:row}
.prow.r{flex-direction:row-reverse}
.node{
  flex:0 0 auto;width:74px;height:74px;border-radius:50%;
  display:grid;place-items:center;text-decoration:none;
  font:800 28px/1 'Baloo 2',sans-serif;color:#fff;
  background:var(--coral);box-shadow:0 6px 0 var(--coral-d);
}
.node.vocab{background:var(--mint);color:#06302a;box-shadow:0 6px 0 var(--mint-d)}
.node.done{outline:4px solid var(--sun);outline-offset:3px}
.node.check{width:62px;height:62px;background:var(--sun);color:#3a2a00;box-shadow:0 6px 0 var(--sun-d);font-size:26px}
.pcard{
  flex:1;min-width:0;display:block;text-decoration:none;color:var(--ink);
  background:var(--card);border-radius:20px;padding:12px 14px;
  box-shadow:0 5px 0 var(--shadow);
}
.pcard .tag{font:800 11px 'Nunito',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--coral-d)}
.pcard.vocab .tag{color:var(--mint-d)}
.pcard.check .tag{color:#a87800}
.pcard h4{margin:3px 0 2px;font:800 17px/1.2 'Baloo 2',sans-serif}
.pcard p{margin:0;font-size:13px;color:var(--muted);line-height:1.35}
.stars{color:#f5a300;letter-spacing:2px;font-size:14px;margin-top:5px;white-space:nowrap}
.stars.big{font-size:28px}
.path-foot{text-align:center;margin-top:18px}
.linkbtn{background:none;border:0;color:rgba(234,252,249,.7);text-decoration:underline;cursor:pointer;font:700 13px 'Nunito',sans-serif;padding:6px}

/* tiêu đề nhãn */
.badge{display:inline-block;font:800 11px 'Nunito',sans-serif;border-radius:999px;padding:4px 10px;background:#ffe3d8;color:#9c3418;text-transform:uppercase;letter-spacing:.06em}
.badge.vocab{background:#d9faf1;color:#0d6b58}
.lesson-head h2{font:800 26px/1.15 'Baloo 2',sans-serif;margin:8px 0 4px}
.lesson-head .best{margin:8px 0 0;font-weight:800;color:var(--coral-d)}

/* bảng cấu trúc */
.tbl-wrap{overflow-x:auto}
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th,.tbl td{border-bottom:1px solid #e1efec;padding:8px 6px;text-align:left;vertical-align:top}
.tbl th{color:var(--coral-d);font-weight:800}

/* ví dụ */
.ex{padding:10px 0;border-bottom:1px dashed #d4e9e6}
.ex:last-child{border-bottom:0;padding-bottom:0}
.ex-en{font:800 16px/1.3 'Baloo 2',sans-serif;display:flex;align-items:center;justify-content:space-between;gap:8px}
.ex-vi{font-size:13px;color:var(--muted);margin-top:3px;line-height:1.4}
.sound{
  flex:0 0 auto;width:40px;height:40px;border:0;border-radius:12px;background:#fff;
  font-size:18px;cursor:pointer;box-shadow:0 3px 0 #cfe6e2;
}
.sound:active{transform:translateY(2px);box-shadow:0 1px 0 #cfe6e2}
.wordgrid{display:grid;grid-template-columns:1fr;gap:8px;margin-bottom:6px}
.wchip{background:#f0faf8;border-radius:12px;padding:8px 10px;font-size:14px;line-height:1.35}
.wchip b{font-family:'Baloo 2',sans-serif;font-weight:800;color:#0d4a44;font-size:15px}

/* chọn unit / chip */
.chips{display:flex;gap:8px;overflow-x:auto;padding:4px 2px 8px;scrollbar-width:none;margin:0 -2px}
.chips::-webkit-scrollbar{display:none}
.chip{
  flex:0 0 auto;text-decoration:none;color:var(--txt);cursor:pointer;
  background:rgba(255,255,255,.1);border:2px solid var(--line);border-radius:999px;
  padding:6px 13px;font:800 14px 'Baloo 2',sans-serif;
}
.chip.on{background:var(--sun);color:#3a2a00;border-color:var(--sun)}
.seg{display:flex;background:rgba(255,255,255,.08);border-radius:16px;padding:4px;gap:4px;margin:10px 0 4px}
.seg a,.seg button{flex:1;text-align:center;text-decoration:none;color:var(--txt);border:0;background:transparent;border-radius:12px;padding:9px 6px;font:800 14px 'Baloo 2',sans-serif;cursor:pointer}
.seg .on{background:var(--mint);color:#06302a}

/* bài kiểm tra */
.quiz .qhead{display:flex;justify-content:space-between;gap:8px;font-weight:800;font-size:13px;color:var(--muted)}
.qsrc{color:var(--coral-d);text-align:right}
.pbar{height:10px;background:#e2f3f0;border-radius:8px;overflow:hidden;margin:8px 0 12px}
.pbar i{display:block;height:100%;background:var(--mint);border-radius:8px;transition:width .3s ease}
.qtext{font:800 21px/1.35 'Baloo 2',sans-serif;margin:6px 0 14px;word-break:break-word}
.opts{display:grid;gap:10px}
.opt{
  font:700 16px/1.35 'Nunito',sans-serif;text-align:left;color:var(--ink);
  background:#fff;border:2px solid #d3e9e6;border-radius:16px;padding:12px 14px;
  cursor:pointer;box-shadow:0 4px 0 #cfe6e2;
}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--ok);background:#e8faf0}
.opt.wrong{border-color:var(--bad);background:#fff0f2}
.fill{
  width:100%;font:700 18px 'Nunito',sans-serif;color:var(--ink);
  padding:12px 14px;border-radius:14px;border:2px solid #d3e9e6;margin-bottom:10px;background:#fff;
}
.fill:disabled{background:#f2f7f6}
.feedback{margin-top:12px;border-radius:14px;padding:10px 12px;font-size:15px;line-height:1.45}
.feedback:empty{display:none}
.feedback.ok{background:#e8faf0;color:#0d5a34}
.feedback.bad{background:#fff0f2;color:#8a1c2e}
.feedback strong{display:block;margin-bottom:2px}
.qnav{margin-top:12px}
.result{text-align:center}
.result h2{font:800 52px/1 'Baloo 2',sans-serif;margin:8px 0}
.result p{margin:8px 0}

/* từ vựng */
.wrow{
  display:flex;align-items:center;gap:10px;color:var(--ink);
  background:var(--card);border-radius:16px;padding:10px 12px;margin:10px 0;
  box-shadow:0 4px 0 var(--shadow);
}
.wrow.learned{background:#e8faf0}
.wtxt{flex:1;min-width:0}
.wen{font:800 17px/1.2 'Baloo 2',sans-serif;word-break:break-word}
.wvi{font-size:14px;color:var(--muted);margin-top:2px}
.wchk{font-size:13px;font-weight:800;display:flex;align-items:center;gap:4px;white-space:nowrap;cursor:pointer}
.wchk input{width:18px;height:18px;accent-color:var(--mint-d)}
.flash{
  min-height:250px;display:flex;flex-direction:column;justify-content:center;align-items:center;
  text-align:center;cursor:pointer;user-select:none;-webkit-user-select:none;
}
.flash .big{font:800 36px/1.1 'Baloo 2',sans-serif;word-break:break-word}
.flash .mean{font:700 24px/1.3 'Baloo 2',sans-serif;color:#0d6b58;word-break:break-word}
.flash .hint{font-size:13px;color:var(--muted);margin-top:14px}
.flashnav{display:flex;gap:10px;margin-top:6px}
.flashnav .btn{flex:1}

/* nghe / đọc */
.listen-line{font:800 20px/1.35 'Baloo 2',sans-serif;margin:8px 0 6px;word-break:break-word}
.diff span{display:inline-block;margin:0 3px 0 0;padding:1px 2px;border-radius:6px}
.diff .ok{background:#d6f7e5;color:#0d5a34}
.diff .bad{background:#ffe0e6;color:#8a1c2e}
.passage{font-size:17px;line-height:1.7;margin:6px 0 4px}
.passage-title{font:800 22px/1.2 'Baloo 2',sans-serif;margin:0 0 8px}

/* đề thi */
.testcard{
  display:flex;justify-content:space-between;align-items:center;gap:12px;
  text-decoration:none;color:var(--ink);
}
.testcard h3{margin:2px 0 4px;font:800 19px/1.2 'Baloo 2',sans-serif}
.testcard .score{font:800 22px 'Baloo 2',sans-serif;color:var(--coral-d);flex:0 0 auto}
.testcard.final{background:linear-gradient(135deg,#fff7d6,#ffeaa6)}
.tag{font:800 11px 'Nunito',sans-serif;letter-spacing:.08em;text-transform:uppercase;color:var(--coral-d)}

.empty{text-align:center}
.empty h3{margin:6px 0 4px}

/* thanh menu dưới */
.tabbar{
  position:fixed;bottom:0;left:50%;transform:translateX(-50%);
  width:min(560px,100%);z-index:20;
  display:grid;grid-template-columns:repeat(6,1fr);gap:2px;
  background:#062427;border-top:1px solid var(--line);
  padding:6px 4px calc(6px + env(safe-area-inset-bottom,0px));
}
.tabbar a{
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  color:rgba(234,252,249,.72);text-decoration:none;
  font:800 10.5px/1.1 'Nunito',sans-serif;padding:5px 0;border-radius:12px;min-width:0;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.tabbar a .ti{font-size:20px;line-height:1.1}
.tabbar a.on{color:var(--sun);background:rgba(255,211,77,.12)}

@media (max-width:370px){
  .brand-sub{display:none}
  .tabbar a{font-size:9.5px}
  .tabbar a .ti{font-size:18px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}

/* ---------- đăng nhập & đồng bộ tiến độ (sync.js) ---------- */
.fe-auth{flex:0 0 auto;width:40px;height:40px;border-radius:14px;border:2px solid var(--line);background:rgba(255,255,255,.12);color:var(--txt);font:800 16px 'Baloo 2',sans-serif;cursor:pointer;padding:0;line-height:1}
.fe-auth.warn{background:rgba(255,93,115,.45)}
.fe-overlay{position:fixed;inset:0;background:rgba(5,30,33,.6);display:flex;align-items:center;justify-content:center;padding:16px;z-index:100}
.fe-modal{background:var(--card);color:var(--ink);border-radius:20px;padding:20px;width:100%;max-width:360px;max-height:90vh;overflow:auto;box-shadow:0 12px 40px rgba(0,0,0,.35);box-sizing:border-box}
.fe-modal h2{font:800 22px/1.2 'Baloo 2',sans-serif;margin:0 0 6px}
.fe-modal p{margin:6px 0;font:600 14px/1.45 'Nunito',sans-serif}
.fe-modal input{width:100%;font:700 16px 'Nunito',sans-serif;padding:10px 12px;border:2px solid #cfe7e2;border-radius:12px;margin:6px 0;box-sizing:border-box;color:var(--ink);background:#fff}
.fe-modal .row{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.fe-msg{font:700 13px/1.4 'Nunito',sans-serif;min-height:18px;color:#c2344c;margin-top:4px}
.fe-status{font:700 13px/1.4 'Nunito',sans-serif;color:#2a7f76;min-height:18px}
.fe-email{font-weight:800 !important;word-break:break-all}
.fe-note{font-size:13px !important;color:#4b6b68 !important}
.fe-link{display:block;width:100%;background:none;border:0;color:var(--mint-d);font:800 15px 'Nunito',sans-serif;padding:8px;margin-top:4px;cursor:pointer;text-decoration:underline}