/* =========================================================
   anng.trades · Orderflow Course — stylesheet dùng chung
   Đổi màu thương hiệu: chỉ sửa các biến trong :root
   ========================================================= */
:root{
  --bg:#0a0e11; --panel:#10161a; --panel2:#141c21; --line:#1e2a31; --line2:#2a3942;
  --fg:#dce6e9; --fg2:#b5c4c9; --muted:#7d9098; --dim:#55666e;
  --teal:#46e3ff; --teal-soft:rgba(70,227,255,.12); --teal-ink:#001017;
  --red:#f0555b; --red-soft:rgba(240,85,91,.12);
  --amber:#f5b942; --amber-soft:rgba(245,185,66,.12);
  --cyan:#63c3e6; --blue:#79a8f0;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --radius:5px;
  color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{margin:0;min-height:100%}
body{background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:15.5px;line-height:1.7;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;background-attachment:fixed;background-position:-1px -1px}
body::before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse at 60% 0%,transparent 0%,var(--bg) 70%);pointer-events:none;z-index:0}
a{color:var(--teal);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--teal);outline-offset:2px;border-radius:4px}
img{max-width:100%;height:auto}
.mono{font-family:var(--mono)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.k{color:var(--teal);font-weight:600}.r{color:var(--red);font-weight:600}.a{color:var(--amber);font-weight:600}
strong,b{color:#fff;font-weight:600}
[hidden]{display:none!important}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}

/* ---------- nút ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:600 14px var(--sans);padding:11px 18px;border-radius:var(--radius);border:1px solid var(--line2);background:var(--panel);color:var(--fg);cursor:pointer;text-decoration:none;line-height:1.2}
.btn:hover{border-color:var(--teal);text-decoration:none}
.btn.pri{background:var(--teal);color:var(--teal-ink);border-color:var(--teal)}
.btn.pri:hover{filter:brightness(1.08)}
.btn.pri.done{background:transparent;color:var(--teal)}
.btn.ghost{background:transparent;border-color:var(--teal);color:var(--teal)}
.btn.sm{font-size:12.5px;padding:7px 12px}
.btn.danger{border-color:var(--red);color:var(--red);background:transparent}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* ---------- typography trong bài ---------- */
.eyebrow{font:500 11px var(--mono);letter-spacing:.14em;color:var(--teal);text-transform:uppercase}
.crumb{font:500 11px var(--mono);letter-spacing:.12em;color:var(--muted);text-transform:uppercase;display:flex;gap:8px;flex-wrap:wrap}
.crumb b{color:var(--teal);font-weight:500}
.meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:22px 0 10px;font:500 12px var(--mono);color:var(--muted)}
.tag{border:1px solid var(--teal);color:var(--teal);padding:2px 8px;border-radius:4px;font-size:11.5px}
h1{font-size:clamp(28px,4.4vw,40px);line-height:1.15;letter-spacing:-.02em;margin:0 0 14px;font-weight:800;text-wrap:balance}
h1 em,h2 em{font-style:normal;color:var(--teal)}
.lede{font-size:17px;color:var(--fg2);margin:0 0 30px;max-width:65ch}
.lesson h2{font-size:23px;line-height:1.3;margin:46px 0 14px;font-weight:700;display:flex;gap:12px;align-items:baseline;text-wrap:balance}
.lesson h2::before{content:"//";font:600 14px var(--mono);color:var(--teal);flex:none}
.lesson h3{font-size:17px;margin:26px 0 8px}
.lesson p{margin:0 0 14px;max-width:68ch}
ul.dots{padding:0;margin:0 0 16px;list-style:none;display:grid;gap:9px}
ul.dots li{position:relative;padding-left:20px;max-width:66ch}
ul.dots li::before{content:"";position:absolute;left:4px;top:.72em;width:6px;height:6px;border-radius:50%;background:var(--teal)}
ul.dots.red li::before{background:var(--red)}

/* ---------- hình minh họa (khung góc) ---------- */
.fig{position:relative;margin:26px 0 30px;background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:16px 16px 14px}
.fig::before,.fig::after{content:"";position:absolute;width:14px;height:14px;border-color:var(--teal);border-style:solid;pointer-events:none}
.fig::before{top:-1px;left:-1px;border-width:2px 0 0 2px}
.fig::after{bottom:-1px;right:-1px;border-width:0 2px 2px 0}
.fig .ft{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;font:500 11px var(--mono);letter-spacing:.1em;color:var(--muted);margin-bottom:10px;text-transform:uppercase}
.fig .ft b{color:var(--fg);font-weight:500}
.fig .ctl{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.fig .svgwrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.fig svg{display:block;width:100%;height:auto;min-width:560px}
.fig svg.narrow{min-width:0}
.fig .cap{font-size:13.5px;color:var(--muted);margin:12px 0 0;line-height:1.6;max-width:none}
.toggle{display:inline-flex;border:1px solid var(--line2);border-radius:5px;overflow:hidden}
.toggle button{background:none;border:0;color:var(--muted);font:500 11px var(--mono);padding:5px 10px;cursor:pointer;letter-spacing:.08em}
.toggle button.on{background:var(--teal-soft);color:var(--teal)}
.toggle button.on.sell{background:var(--red-soft);color:var(--red)}
.play{background:none;border:1px solid var(--line2);color:var(--muted);font:500 11px var(--mono);padding:5px 10px;border-radius:5px;cursor:pointer;letter-spacing:.08em}
.play:hover{color:var(--teal);border-color:var(--teal)}
/* animation chung cho phần tử SVG */
.fx{opacity:0;animation:fxIn .45s ease forwards}
.fx-up{opacity:0;transform-box:fill-box;transform-origin:50% 100%;animation:fxUp .5s ease forwards}
.fx-grow{opacity:0;transform-box:fill-box;transform-origin:100% 50%;animation:fxGrow .55s ease forwards}
.fx-growL{opacity:0;transform-box:fill-box;transform-origin:0% 50%;animation:fxGrow .55s ease forwards}
.fx-pop{opacity:0;transform-box:fill-box;transform-origin:50% 50%;animation:fxPop .5s cubic-bezier(.3,1.6,.5,1) forwards}
.fx-draw{stroke-dasharray:var(--len);stroke-dashoffset:var(--len);animation:fxDraw var(--dur,1.6s) ease forwards}
.fx-pulse{animation:fxPulse 1.6s ease-in-out infinite}
@keyframes fxIn{to{opacity:1}}
@keyframes fxUp{from{opacity:0;transform:scaleY(.2)}to{opacity:1;transform:none}}
@keyframes fxGrow{from{opacity:0;transform:scaleX(0)}to{opacity:1;transform:none}}
@keyframes fxPop{from{opacity:0;transform:scale(.2)}to{opacity:1;transform:none}}
@keyframes fxDraw{to{stroke-dashoffset:0}}
@keyframes fxPulse{0%,100%{opacity:1}50%{opacity:.35}}

/* ---------- khối nội dung ---------- */
.defs{display:grid;gap:10px;margin:8px 0 18px}
.def{border-left:3px solid var(--teal);background:var(--panel);padding:12px 16px;border-radius:0 4px 4px 0}
.def.red{border-left-color:var(--red)}.def.amb{border-left-color:var(--amber)}.def.blue{border-left-color:var(--blue)}
.def b.lb{display:block;font:600 12px var(--mono);letter-spacing:.08em;color:var(--teal);margin-bottom:3px;text-transform:uppercase}
.def.red b.lb{color:var(--red)}.def.amb b.lb{color:var(--amber)}.def.blue b.lb{color:var(--blue)}
.def p{margin:0!important;font-size:14.5px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0 18px}
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:14px 0 22px}
.step{background:var(--panel);border:1px solid var(--line);border-top:2px solid var(--teal);padding:12px 12px 14px;border-radius:3px}
.step .n{font:600 11px var(--mono);color:var(--teal)}
.step h5{margin:4px 0 6px;font-size:14px}
.step p{margin:0!important;font-size:12.5px;color:var(--muted);line-height:1.5}
.step.warn{border-top-color:var(--red)}.step.warn .n{color:var(--red)}
.tblw{overflow-x:auto;margin:10px 0 22px;-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:14px;min-width:480px}
th,td{text-align:left;padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font:500 11px var(--mono);letter-spacing:.1em;color:var(--muted);text-transform:uppercase;background:var(--panel2)}
td:first-child{font-weight:600}
.key{margin:34px 0;border:1px solid var(--amber);background:var(--amber-soft);border-radius:4px;padding:16px 20px}
.key .t{font:600 11px var(--mono);letter-spacing:.14em;color:var(--amber);margin-bottom:6px}
.key p{margin:0!important;font-size:16px;color:#fff}
.note{margin:18px 0;border:1px solid var(--line2);background:var(--panel);border-radius:4px;padding:12px 16px;font-size:14.5px}
.note .t{font:600 11px var(--mono);letter-spacing:.14em;color:var(--teal);margin-bottom:4px}
.note.warn{border-color:var(--red)}.note.warn .t{color:var(--red)}
.stmt{font-weight:700;font-size:clamp(18px,2.6vw,22px);line-height:1.4;border-left:3px solid var(--teal);padding-left:14px;margin:18px 0 24px}
.stmt span{color:var(--teal);display:block}
.video{position:relative;aspect-ratio:16/9;background:#000;border:1px solid var(--line);border-radius:4px;overflow:hidden;margin:6px 0 26px}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* ---------- quiz ---------- */
.quiz{margin-top:46px;border-top:1px solid var(--line);padding-top:8px}
.q{margin:20px 0 6px}
.q .qt{font-weight:600;margin-bottom:10px}
.opt{display:flex;gap:12px;align-items:flex-start;width:100%;text-align:left;background:var(--panel);border:1px solid var(--line);color:var(--fg);padding:10px 14px;border-radius:5px;margin-bottom:8px;cursor:pointer;font:inherit;font-size:14.5px;line-height:1.5}
.opt:hover{border-color:var(--line2)}
.opt .L{font:600 12px/1.9 var(--mono);color:var(--muted);flex:none}
.opt.ok{border-color:var(--teal);background:var(--teal-soft)}.opt.ok .L{color:var(--teal)}
.opt.bad{border-color:var(--red);background:var(--red-soft)}.opt.bad .L{color:var(--red)}
.opt[disabled]{cursor:default}
.qx{font-size:13.5px;color:var(--muted);margin:2px 0 0}

/* ---------- placeholder / thông báo ---------- */
.ph{border:1px dashed var(--line2);border-radius:6px;padding:22px;background:var(--panel);margin-top:10px}
.ph .mono{font-size:11px;color:var(--amber);letter-spacing:.12em}
.alert{border:1px solid var(--line2);background:var(--panel);border-radius:5px;padding:12px 14px;font-size:14px;margin:12px 0}
.alert.err{border-color:var(--red);color:#ffd5d6}
.alert.ok{border-color:var(--teal);color:#c9fff5}

/* =========================================================
   LANDING
   ========================================================= */
.wrap{position:relative;z-index:1;max-width:1120px;margin:0 auto;padding:0 24px}
.nav{position:sticky;top:0;z-index:30;background:rgba(10,14,17,.86);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:62px}
.logo{display:flex;flex-direction:column;line-height:1.1;color:var(--fg)}
.logo:hover{text-decoration:none}
.logo .eb{font:500 10px var(--mono);letter-spacing:.16em;color:var(--teal)}
.logo .nm{font-weight:800;font-size:17px;letter-spacing:-.01em}
.nav .links{display:flex;gap:22px;align-items:center;font-size:14px}
.nav .links a.l{color:var(--muted)}
.nav .links a.l:hover{color:var(--fg);text-decoration:none}
.lang{display:inline-flex;border:1px solid var(--line2);border-radius:5px;overflow:hidden}
.lang button{background:none;border:0;color:var(--muted);font:600 11px var(--mono);padding:6px 9px;cursor:pointer;letter-spacing:.08em}
.lang button.on{background:var(--teal-soft);color:var(--teal)}
.burger{display:none;background:none;border:1px solid var(--line2);color:var(--fg);border-radius:5px;padding:6px 10px;font:500 12px var(--mono)}
section.blk{position:relative;z-index:1;padding:96px 0;border-bottom:1px solid var(--line)}
.sh{margin-bottom:36px;max-width:720px}
.sh h2{font-size:clamp(26px,3.6vw,36px);line-height:1.2;letter-spacing:-.015em;margin:10px 0 12px;font-weight:800;text-wrap:balance}
.sh p{color:var(--fg2);font-size:16.5px;margin:0}
.hero{padding:88px 0 80px}
.hero .grid2{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{font-size:clamp(36px,6vw,62px);line-height:1.06;margin:16px 0 18px}
.hero .lede{font-size:18px;margin-bottom:28px}
.hero .ctas{display:flex;gap:12px;flex-wrap:wrap}
.hero .stats,.dash .stats{display:flex;gap:28px;flex-wrap:wrap;margin-top:34px;font-family:var(--mono)}
.stats div{display:flex;flex-direction:column}
.stats b{font-size:24px;color:var(--teal);font-weight:700;font-variant-numeric:tabular-nums}
.stats span{font-size:11px;color:var(--muted);letter-spacing:.1em;text-transform:uppercase}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:20px}
.card .n{font:600 11px var(--mono);color:var(--teal);letter-spacing:.12em}
.card h3{margin:8px 0 8px;font-size:17px;line-height:1.35}
.card p{margin:0;font-size:14px;color:var(--muted)}
.card.red .n{color:var(--red)}.card.amb .n{color:var(--amber)}
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cmp .col{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:22px}
.cmp .col.of{border-color:var(--teal);box-shadow:0 0 0 1px var(--teal-soft) inset}
.cmp h3{margin:0 0 12px;font:600 12px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.cmp .of h3{color:var(--teal)}
.cmp ul{margin:0;padding:0;list-style:none;display:grid;gap:10px}
.cmp li{padding-left:22px;position:relative;font-size:14.5px}
.cmp li::before{content:"–";position:absolute;left:4px;color:var(--dim)}
.cmp .of li::before{content:"✓";color:var(--teal)}
.mods{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.mod{background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:16px;display:flex;flex-direction:column;gap:6px}
.mod .n{font:600 11px var(--mono);color:var(--teal);letter-spacing:.1em}
.mod h3{margin:0;font-size:16px;line-height:1.35}
.mod p{margin:0;font-size:13px;color:var(--muted);line-height:1.5}
.mod .ft2{margin-top:auto;padding-top:8px;font:400 11px var(--mono);color:var(--dim)}
.road{position:relative;display:grid;gap:0;margin-left:10px;border-left:1px solid var(--line2)}
.road .it{position:relative;padding:0 0 30px 30px}
.road .it::before{content:"";position:absolute;left:-6px;top:6px;width:11px;height:11px;border-radius:50%;background:var(--bg);border:2px solid var(--teal)}
.road .it .n{font:600 11px var(--mono);color:var(--teal);letter-spacing:.12em}
.road .it h3{margin:2px 0 4px;font-size:17px}
.road .it p{margin:0;color:var(--muted);font-size:14.5px;max-width:62ch}
.about{display:grid;grid-template-columns:260px 1fr;gap:36px;align-items:start}
.avatar{position:relative;aspect-ratio:4/5;background:var(--panel);border:1px solid var(--line);border-radius:6px;display:flex;align-items:center;justify-content:center;color:var(--dim);font:500 11px var(--mono);letter-spacing:.12em;overflow:hidden}
.avatar::before,.avatar::after{content:"";position:absolute;width:14px;height:14px;border-color:var(--teal);border-style:solid}
.avatar::before{top:-1px;left:-1px;border-width:2px 0 0 2px}.avatar::after{bottom:-1px;right:-1px;border-width:0 2px 2px 0}
.faq{display:grid;gap:10px;max-width:820px}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:5px}
.faq summary{cursor:pointer;list-style:none;padding:15px 18px;font-weight:600;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font:500 18px var(--mono);color:var(--teal);line-height:1}
.faq details[open] summary::after{content:"–"}
.faq .ans{padding:0 18px 16px;color:var(--fg2);font-size:14.5px}
.disc{border:1px solid var(--red);background:var(--red-soft);border-radius:5px;padding:16px 20px;font-size:14.5px}
.disc .t{font:600 11px var(--mono);letter-spacing:.14em;color:var(--red);margin-bottom:4px}
footer.site{position:relative;z-index:1;padding:36px 0 44px;font:400 12px var(--mono);color:var(--dim)}
footer.site .in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
.social{display:flex;gap:10px;align-items:center}
.social span{color:var(--muted);letter-spacing:.1em;text-transform:uppercase;font-size:11px;margin-right:4px}
.social a{display:inline-flex;width:38px;height:38px;align-items:center;justify-content:center;border:1px solid var(--line2);border-radius:6px;color:var(--muted)}
.social a:hover{color:var(--teal);border-color:var(--teal)}
.social svg{width:18px;height:18px}

/* =========================================================
   LEARN (khu học) — rail + cột đọc
   ========================================================= */
.app{position:relative;z-index:1;display:grid;grid-template-columns:300px minmax(0,1fr);min-height:100vh}
.side{position:sticky;top:0;height:100vh;overflow-y:auto;border-right:1px solid var(--line);background:rgba(10,14,17,.92);backdrop-filter:blur(6px);padding:22px 18px 40px}
.side::-webkit-scrollbar{width:6px}.side::-webkit-scrollbar-thumb{background:var(--line2);border-radius:3px}
.brand{display:flex;flex-direction:column;gap:2px;padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:16px;cursor:pointer;color:var(--fg)}
.brand:hover{text-decoration:none}
.brand .eb{font:500 10.5px/1 var(--mono);letter-spacing:.14em;color:var(--teal)}
.brand .nm{font-weight:800;font-size:19px;letter-spacing:-.01em;line-height:1.25}
.brand .by{font:400 11px var(--mono);color:var(--muted)}
.prog{margin-bottom:18px}
.prog .row{display:flex;justify-content:space-between;font:400 11px var(--mono);color:var(--muted);margin-bottom:6px}
.bar{height:3px;background:var(--line);border-radius:2px;overflow:hidden}
.bar i{display:block;height:100%;background:var(--teal);width:0;transition:width .4s}
.part{margin-top:22px;font:600 10px var(--mono);letter-spacing:.16em;color:var(--teal);text-transform:uppercase}
.chap{margin-top:12px}
.chap h4{margin:0 0 6px;font:500 10.5px/1.4 var(--mono);letter-spacing:.12em;color:var(--dim);text-transform:uppercase}
.les{display:grid;grid-template-columns:44px 1fr auto;gap:6px;align-items:start;padding:6px 8px;border-radius:6px;color:var(--fg);font-size:13px;line-height:1.4;border:1px solid transparent;cursor:pointer;width:100%;text-align:left;background:none;font-family:var(--sans)}
.les:hover{background:var(--panel);text-decoration:none}
.les .id{font:500 11px/1.6 var(--mono);color:var(--muted)}
.les.active{background:var(--panel2);border-color:var(--line2)}
.les.active .id{color:var(--teal)}
.les .st{font:400 10px/1.6 var(--mono);color:var(--dim)}
.les .st.done{color:var(--teal)}
.side .acct{margin-top:26px;padding-top:14px;border-top:1px solid var(--line);font:400 11.5px var(--mono);color:var(--muted);display:grid;gap:8px}
.side .acct a{color:var(--muted)}.side .acct a:hover{color:var(--teal)}
.mtop{display:none}
main.read{min-width:0;padding:34px 40px 80px;display:flex;justify-content:center}
.col{width:100%;max-width:780px;min-width:0;position:relative}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:40px}
.pn a{display:block;border:1px solid var(--line);background:var(--panel);padding:14px 16px;border-radius:5px;color:var(--fg);text-decoration:none;min-width:0}
.pn a:hover{border-color:var(--teal)}
.pn small{display:block;font:500 11px var(--mono);letter-spacing:.1em;color:var(--muted)}
.pn a.nx{text-align:right}
.foot{margin-top:40px;padding-top:16px;border-top:1px solid var(--line);font:400 11.5px var(--mono);color:var(--dim);display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.dash .hero2{padding:10px 0 26px;border-bottom:1px solid var(--line);margin-bottom:28px}
.dash h1{font-size:clamp(32px,5.5vw,52px);margin-top:14px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.cc{background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:16px;cursor:pointer;display:flex;flex-direction:column;gap:6px;text-align:left;color:var(--fg);font:inherit}
.cc:hover{border-color:var(--teal);text-decoration:none}
.cc .n{font:600 11px var(--mono);color:var(--teal);letter-spacing:.1em}
.cc h3{margin:0;font-size:16px;line-height:1.35}
.cc p{margin:0;font-size:13px;color:var(--muted);line-height:1.5}
.cc .ft2{margin-top:auto;padding-top:8px;font:400 11px var(--mono);color:var(--dim);display:flex;justify-content:space-between}
.cc .mini{height:2px;background:var(--line);border-radius:1px;overflow:hidden}.cc .mini i{display:block;height:100%;background:var(--teal)}
/* watermark email học viên */
.wm{position:fixed;inset:0;z-index:5;pointer-events:none;overflow:hidden;opacity:.05;font:600 13px var(--mono);color:#fff;user-select:none}
.wm div{position:absolute;white-space:nowrap;transform:rotate(-24deg)}
.loading{display:flex;align-items:center;gap:10px;color:var(--muted);font:500 12px var(--mono);letter-spacing:.1em;padding:40px 0}
.loading::before{content:"";width:14px;height:14px;border:2px solid var(--line2);border-top-color:var(--teal);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* =========================================================
   AUTH + ADMIN
   ========================================================= */
.authbox{position:relative;z-index:1;max-width:420px;margin:9vh auto 40px;padding:0 16px}
.panelbox{background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:26px}
.panelbox h1{font-size:26px}
label.f{display:block;font:500 11px var(--mono);letter-spacing:.12em;color:var(--muted);text-transform:uppercase;margin:16px 0 6px}
input.in,textarea.in,select.in{width:100%;background:var(--bg);border:1px solid var(--line2);color:var(--fg);border-radius:5px;padding:11px 12px;font:15px var(--sans)}
textarea.in{min-height:110px;font:13px var(--mono);line-height:1.5}
input.in:focus,textarea.in:focus,select.in:focus{outline:none;border-color:var(--teal)}
.linkrow{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:14px;font-size:13.5px}
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin:18px 0 20px;flex-wrap:wrap}
.tabs button{background:none;border:0;border-bottom:2px solid transparent;color:var(--muted);font:600 13px var(--sans);padding:10px 12px;cursor:pointer}
.tabs button.on{color:var(--teal);border-bottom-color:var(--teal)}
.pill{display:inline-block;font:600 10.5px var(--mono);letter-spacing:.08em;padding:2px 8px;border-radius:10px;border:1px solid var(--line2);color:var(--muted)}
.pill.active{border-color:var(--teal);color:var(--teal)}.pill.revoked{border-color:var(--red);color:var(--red)}.pill.expired{border-color:var(--amber);color:var(--amber)}
.adm{position:relative;z-index:1;max-width:1060px;margin:0 auto;padding:30px 24px 80px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}

/* =========================================================
   RESPONSIVE (mobile-first breakpoints)
   ========================================================= */
@media (max-width:900px){
  .app{grid-template-columns:1fr}
  .side{position:fixed;inset:0 auto 0 0;width:min(320px,86vw);z-index:40;transform:translateX(-102%);transition:transform .25s;height:100%}
  .side.open{transform:none;box-shadow:0 0 0 100vmax rgba(0,0,0,.55)}
  .mtop{display:flex;position:sticky;top:0;z-index:30;justify-content:space-between;align-items:center;padding:10px 16px;background:rgba(10,14,17,.95);border-bottom:1px solid var(--line)}
  .mtop button{background:none;border:1px solid var(--line2);color:var(--fg);font:500 12px var(--mono);padding:6px 10px;border-radius:5px}
  .mtop span{font:600 12px var(--mono);color:var(--teal);letter-spacing:.08em}
  main.read{padding:24px 16px 60px}
  .pn{grid-template-columns:1fr}
  .hero .grid2,.about,.cmp,.row2,.duo{grid-template-columns:1fr}
  .about .avatar{max-width:260px}
  .nav .links{display:none}
  .nav .links.open{display:flex;position:absolute;top:62px;left:0;right:0;flex-direction:column;align-items:flex-start;gap:14px;padding:18px 24px;background:var(--bg);border-bottom:1px solid var(--line)}
  .burger{display:inline-block}
  section.blk{padding:64px 0}
  .hero{padding:52px 0 56px}
  .wrap{padding:0 16px}
}
/* link chéo giữa các bài */
.lesson a.xref{color:var(--teal);border-bottom:1px dashed rgba(70,227,255,.55);text-decoration:none;white-space:nowrap}
.lesson a.xref:hover{border-bottom-style:solid;background:var(--teal-soft)}
.xback{position:sticky;top:12px;z-index:5;display:inline-flex;align-items:center;gap:6px;margin:0 0 14px;padding:7px 14px;border:1px solid var(--teal);border-radius:999px;background:var(--panel);color:var(--teal);font:500 12px var(--mono);letter-spacing:.04em;box-shadow:0 6px 20px rgba(0,0,0,.35)}
.xback:hover{background:var(--teal-soft);text-decoration:none}
@media (max-width:900px){.xback{top:62px}}

/* ảnh tĩnh trong bài (hình khó dựng động) */
.figimg{margin:22px 0;border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:12px;position:relative}
.figimg .ft{font:500 11px var(--mono);letter-spacing:.08em;color:var(--muted);margin:0 0 10px;text-transform:uppercase}
.figimg .ft b{color:var(--fg)}
.figimg img{display:block;width:100%;height:auto;border-radius:6px;background:#fff}
.figimg.dark img{background:transparent}
.figimg .cap{margin:10px 2px 0;color:var(--muted);font-size:14px;line-height:1.6}

/* bài chưa mở */
.les.locked{opacity:.55}
.les .st.lock{font-size:11px;filter:grayscale(1)}
.lockbox{border-style:dashed}

/* bảng chọn bài mở khóa (admin) */
.unl-tools{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:14px}
.unl-n{display:inline-flex;gap:6px;align-items:center}.unl-n .in{width:70px;padding:6px 8px}
.unl-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px;max-height:520px;overflow:auto;padding-right:4px}
.unl-ch{border:1px solid var(--line);border-radius:10px;padding:8px 12px 10px;margin:0}
.unl-ch legend{font-size:13px;font-weight:600;padding:0 6px}
.unl-l{display:flex;gap:8px;align-items:baseline;font-size:13.5px;padding:3px 0;cursor:pointer}
.unl-l .mono{color:var(--muted);font-size:12px;min-width:34px}

/* =========================================================
   DOMSIM — DOM + nến cluster mô phỏng (bài 0.1), màu theo hình bài giảng
   ========================================================= */
.dsim{--ds-bg:#0a0e11;--ds-panel:#10161a;--ds-line:#1e2a31;--ds-line2:#2a3942;--ds-fg:#dce6e9;--ds-muted:#7d9098;
  --ds-bid:#2dd4bf;--ds-bid-dim:rgba(45,212,191,.16);--ds-ask:#f0555b;--ds-ask-dim:rgba(240,85,91,.16);
  --ds-buy:#2dd4bf;--ds-sell:#f0555b;--ds-gold:#f5b942;--ds-vp:#63c3e6;--ds-dpos:#2dd4bf;--ds-dneg:#f0555b;
  margin:22px 0;border:1px solid var(--ds-line);border-radius:12px;background:var(--ds-panel);padding:14px;font-size:14px;color:var(--ds-fg)}
.dsim .ds-stats{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.dsim .ds-stat{background:var(--ds-bg);border:1px solid var(--ds-line);border-radius:6px;padding:6px 10px;min-width:92px}
.dsim .ds-stat b{display:block;font-family:var(--mono);font-size:15px;font-variant-numeric:tabular-nums}
.dsim .ds-stat span{font:500 10.5px var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ds-muted)}
.dsim .up{color:var(--ds-buy)}.dsim .down{color:var(--ds-sell)}.dsim .c-bid{color:var(--ds-bid)}.dsim .c-ask{color:var(--ds-ask)}
.dsim .ds-chips{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px}
.dsim .ds-chip{touch-action:none;user-select:none;cursor:grab;border-radius:8px;padding:9px 8px;text-align:left;font:inherit;color:var(--ds-fg);border:1.5px solid;background:transparent}
.dsim .ds-chip b{display:block;font-family:var(--mono);font-size:12.5px}
.dsim .ds-chip small{color:var(--ds-muted);font-size:11px}
.dsim .ds-chip.bm{border-color:var(--ds-buy);background:rgba(45,212,191,.12)}
.dsim .ds-chip.sm{border-color:var(--ds-sell);background:rgba(240,85,91,.12)}
.dsim .ds-chip.bl{border-color:var(--ds-bid);border-style:dashed}
.dsim .ds-chip.sl{border-color:var(--ds-ask);border-style:dashed}
.dsim .ds-chip.pl{border-color:var(--ds-muted);border-style:dotted}
.dsim .ds-chip.armed{box-shadow:0 0 0 2px var(--ds-gold)}
.dsim .ds-row2{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;justify-content:space-between;margin-top:12px}
.dsim .ds-sizes{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.dsim .ds-lb{font:500 11px var(--mono);color:var(--ds-muted);letter-spacing:.06em;text-transform:uppercase;margin-right:4px}
.dsim .ds-sizes button,.dsim .ds-acts button{font-family:var(--mono);font-size:12px;background:var(--ds-bg);color:var(--ds-fg);border:1px solid var(--ds-line2);border-radius:5px;padding:5px 9px;cursor:pointer}
.dsim .ds-sizes button.on{border-color:var(--ds-gold);color:var(--ds-gold)}
.dsim .ds-sizes input{width:64px;font-family:var(--mono);font-size:12px;background:var(--ds-bg);color:var(--ds-fg);border:1px solid var(--ds-line2);border-radius:5px;padding:5px 6px}
.dsim .ds-opt{display:inline-flex;gap:8px;align-items:center;font-size:13px;cursor:pointer}
.dsim .ds-opt input{accent-color:var(--ds-buy);width:16px;height:16px}
.dsim .ds-acts{display:flex;gap:8px;flex-wrap:wrap}
.dsim .ds-acts button:hover{border-color:var(--ds-muted)}
.dsim .ds-hint{font-size:12.5px;color:var(--ds-gold);min-height:18px}
.dsim .ds-ladderbox{margin-top:14px;overflow-x:auto;border-top:1px solid var(--ds-line);padding-top:10px}
.dsim .ds-ladder{min-width:calc(250px + var(--nc,2)*164px)}
.dsim .ds-lhead,.dsim .row,.dsim .ds-fsum{display:grid;grid-template-columns:minmax(70px,1fr) 98px minmax(70px,1fr) repeat(var(--nc,2),160px);align-items:center}
.dsim .ds-lhead{font-family:var(--mono);font-size:10.5px;color:var(--ds-muted);padding-bottom:6px;text-align:center;letter-spacing:.04em}
.dsim .ds-lhead .fh{border-left:1px solid var(--ds-line);line-height:1.3}
.dsim .ds-lhead .fh small{display:block;font-size:9.5px;opacity:.8}
.dsim .ds-lhead .fh.cur{color:var(--ds-gold)}
.dsim .row{height:27px;border-top:1px solid transparent;border-bottom:1px solid transparent;position:relative}
.dsim .row.target{background:rgba(245,185,66,.12);border-color:rgba(245,185,66,.5)}
.dsim .row.spread-below{border-bottom:1px dashed var(--ds-gold)}
.dsim .cell{height:100%;display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:12.5px;font-variant-numeric:tabular-nums;padding:2px 6px;min-width:0}
.dsim .bid{justify-content:flex-end}
.dsim .bar{height:19px;border-radius:2px;transition:width .35s ease}
.dsim .bid .bar{background:var(--ds-bid-dim)}.dsim .ask .bar{background:var(--ds-ask-dim)}
.dsim .bid .n{color:var(--ds-bid)}.dsim .ask .n{color:var(--ds-ask)}
.dsim .row.bb .bid .bar{background:rgba(45,212,191,.55)}.dsim .row.ba .ask .bar{background:rgba(240,85,91,.55)}
.dsim .price{justify-content:center;font-weight:500;white-space:nowrap}
.dsim .row.last .price{background:rgba(245,185,66,.18);color:var(--ds-gold);font-weight:700;border-radius:3px}
.dsim .mine{font:600 10.5px var(--mono);padding:1px 4px;border-radius:3px;border:1px solid var(--ds-gold);color:var(--ds-gold);background:transparent;white-space:nowrap;cursor:pointer}
.dsim .mine:hover{background:rgba(245,185,66,.15)}
.dsim .fp{height:100%;display:grid;grid-template-columns:12px minmax(0,1fr) 56px;align-items:stretch;font-family:var(--mono);font-size:11.5px;font-variant-numeric:tabular-nums;border-left:1px solid var(--ds-line);position:relative}
.dsim .fp .wk{position:relative}
.dsim .fp .wk i{position:absolute;left:50%;transform:translateX(-50%);top:0;bottom:0;width:2px}
.dsim .fp .wk i.body{width:7px;border-radius:1px}
.dsim .fp .wk i.up{background:var(--ds-buy)}.dsim .fp .wk i.dn{background:var(--ds-sell)}
.dsim .fp .nums{position:relative;display:grid;grid-template-columns:1fr 12px 1fr;align-items:center;margin:2px 0}
.dsim .fp .vpb{position:absolute;left:0;top:0;bottom:0;background:rgba(99,195,230,.16);border-right:2px solid rgba(99,195,230,.55);transition:width .35s ease}
.dsim .fp .fb,.dsim .fp .fa,.dsim .fp .x{position:relative;color:#cfd8dc}
.dsim .fp .fb{text-align:right}.dsim .fp .fa{text-align:left}
.dsim .fp .x{text-align:center;color:var(--ds-muted);font-size:10px}
.dsim .fp .z{color:var(--ds-muted);opacity:.5}
.dsim .fp .imb{font-weight:800;color:#fff}
.dsim .fp .imb.ib{color:#ffb3b6}.dsim .fp .imb.ia{color:#a7f3e6}
.dsim .fp.poc .nums{outline:2px solid var(--ds-gold);outline-offset:-1px;border-radius:2px}
.dsim .fp.poc .fb,.dsim .fp.poc .fa{color:var(--ds-gold);font-weight:800}
.dsim .fp .dl{position:relative;display:flex;align-items:center;border-left:1px solid var(--ds-line2);margin:2px 0}
.dsim .fp .dl .db{position:absolute;left:0;top:2px;bottom:2px;opacity:.55;transition:width .35s ease}
.dsim .fp .dl .db.p{background:var(--ds-dpos)}.dsim .fp .dl .db.n{background:var(--ds-dneg)}
.dsim .fp .dl span{position:relative;padding-left:4px;font-size:11px;color:#e9edf5}
.dsim .fp.old{opacity:.6}
/* bong bóng big trade trên thân nến */
.dsim .fp .wk{z-index:2}
.dsim .fp .bt{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:3;width:34px;height:34px;padding:0;font-size:10.5px!important;border-radius:50%;display:grid;place-items:center;font:800 11.5px var(--mono);color:#fff;pointer-events:none;animation:dsPop .45s cubic-bezier(.3,1.6,.5,1)}
.dsim .fp .bt.buy{background:rgba(10,14,17,.55);border:2px solid var(--ds-buy);box-shadow:0 0 12px rgba(45,212,191,.45)}
.dsim .fp .bt.sell{background:rgba(10,14,17,.55);border:2px solid var(--ds-sell);box-shadow:0 0 12px rgba(240,85,91,.45)}
@keyframes dsPop{from{transform:translate(-50%,-50%) scale(.3);opacity:0}to{transform:translate(-50%,-50%) scale(1);opacity:1}}
.dsim .ds-fsum{margin-top:4px;border-top:1px solid var(--ds-line);padding-top:6px;font-family:var(--mono);font-size:11px;font-variant-numeric:tabular-nums}
.dsim .ds-fsum .sc{border-left:1px solid var(--ds-line);padding:0 6px 0 16px;line-height:1.5}
.dsim .ds-fsum .sc span{color:var(--ds-muted)}
.dsim .ds-fsum .lbl{grid-column:1/4;text-align:right;color:var(--ds-muted);padding-right:10px;font-size:11px}
.dsim .flash-buy .ask,.dsim .flash-buy .fp.cur .nums{animation:dsFb .9s ease}
.dsim .flash-sell .bid,.dsim .flash-sell .fp.cur .nums{animation:dsFs .9s ease}
@keyframes dsFb{0%{background:rgba(45,212,191,.45)}100%{background:transparent}}
@keyframes dsFs{0%{background:rgba(240,85,91,.45)}100%{background:transparent}}
.dsim .ds-legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:11.5px;color:var(--ds-muted);padding:10px 2px 2px}
.dsim .ds-legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px}
.dsim .ds-legend i.ell{width:12px;height:12px;border-radius:50%;border:1.5px solid var(--ds-buy);background:rgba(45,212,191,.3)}
.dsim .ds-logwrap{margin-top:12px;border-top:1px solid var(--ds-line);padding-top:10px}
.dsim .ds-logh{font:500 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ds-muted);margin-bottom:8px}
.dsim .ds-log{display:grid;gap:8px;max-height:320px;overflow:auto;padding-right:2px}
.dsim .entry{border-left:3px solid var(--ds-line2);padding:6px 9px;background:var(--ds-bg);border-radius:0 5px 5px 0;font-size:12.5px;line-height:1.55}
.dsim .entry .t{font-family:var(--mono);font-weight:700;font-size:12px}
.dsim .entry.buy{border-color:var(--ds-buy)}.dsim .entry.buy .t{color:var(--ds-buy)}
.dsim .entry.sell{border-color:var(--ds-sell)}.dsim .entry.sell .t{color:var(--ds-sell)}
.dsim .entry.lb{border-color:var(--ds-bid)}.dsim .entry.lb .t{color:var(--ds-bid)}
.dsim .entry.ls{border-color:var(--ds-ask)}.dsim .entry.ls .t{color:var(--ds-ask)}
.dsim .entry.pl{border-color:var(--ds-muted)}.dsim .entry.pl .t{color:var(--ds-muted)}
.dsim .entry .m{font-family:var(--mono);font-size:11.5px;color:var(--ds-muted)}
.dsim .ds-empty{color:var(--ds-muted);font-size:12.5px;line-height:1.55;margin:0}
.ds-ghost{position:fixed;pointer-events:none;z-index:60;font:700 12px var(--mono);padding:6px 10px;border-radius:5px;background:#10161a;border:1.5px solid #f5b942;color:#dce6e9;transform:translate(-50%,-130%);white-space:nowrap;box-shadow:0 6px 18px rgba(0,0,0,.4)}
.dsim :focus-visible{outline:2px solid var(--ds-gold);outline-offset:2px}
@media (max-width:640px){.dsim .ds-chips{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (prefers-reduced-motion:reduce){.dsim .bar,.dsim .fp .vpb,.dsim .fp .dl .db{transition:none}.dsim .flash-buy .ask,.dsim .flash-buy .fp.cur .nums,.dsim .flash-sell .bid,.dsim .flash-sell .fp.cur .nums,.dsim .fp .bt{animation:none}}