/* Trang học thử (người xem). Gốc: working/tfa-redesign/hocthu/shared/base.css và CSS riêng của từng màn demo đã duyệt 14/10,
   bỏ phần chỉ dành cho demo (.demo-nav, .state-bar, .screen-back), phần quản trị và phần mẫu thư. Font Inter nạp ở <head>. */

:root{
  color-scheme:light;
  --c-page:#F4F5F3;--c-surface:#FFFFFF;--c-subtle:#F7F8F6;--c-subtle-hover:#F1F4F0;
  --c-ink:#14181F;--c-body:#4A5260;--c-muted:#7A818C;--c-line:#E3E5E1;--c-line-strong:#B9C2BE;
  --c-emerald:#00CBA9;--c-emerald-text:#00806A;--c-on-emerald:#04231D;--c-emerald-tint:#E9FAF6;--c-emerald-tint-2:#D3F5EE;--c-emerald-ring:rgba(0,203,169,.16);
  --c-amber:#C77A08;--c-amber-tint:#FFF1E0;
  --c-hot:#B4361E;--c-hot-tint:#FDECE7;
  --f:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;
  --fs-display:44px;--fs-h2:30px;--fs-h3:20px;--fs-lead:18px;--fs-card:16px;--fs-small:14px;--fs-caption:12.5px;--fs-overline:12px;
  --r-sm:8px;--r-md:14px;--r-lg:16px;--r-xl:22px;--r-pill:99px;
  --sh-xs:0 1px 2px rgba(20,24,31,.06);
  --sh-sm:0 1px 2px rgba(20,24,31,.06),0 6px 20px rgba(20,24,31,.06);
  --sh-lg:0 1px 2px rgba(20,24,31,.04),0 18px 48px rgba(20,24,31,.08);
  --gutter:24px;
}
@media (max-width:700px){:root{--fs-display:30px;--fs-h2:24px;--fs-lead:16px;--gutter:16px}}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--c-page);color:var(--c-body);font-family:var(--f);font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased}
body{min-height:100vh}
h1,h2,h3{color:var(--c-ink);font-weight:500;letter-spacing:-.025em;line-height:1.12}
a{color:var(--c-emerald-text);text-decoration:none}
a:hover{text-decoration:underline}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
:focus-visible{outline:2px solid var(--c-emerald-text);outline-offset:2px}
[hidden]{display:none!important}
.num{font-variant-numeric:tabular-nums}
.nw{white-space:nowrap}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Nút, ô nhập, viên nhãn ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 20px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;transition:background .15s,box-shadow .15s;text-align:center}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--c-emerald);color:var(--c-on-emerald)}
.btn-primary:hover{background:#00B897}
/* Nút đăng ký khoá: nổi lên khi rê chuột */
.btn[data-buy]{transition:background .15s,box-shadow .15s,transform .15s}
.btn[data-buy]:hover{background:var(--c-emerald-text);color:#fff;box-shadow:0 8px 20px rgba(0,128,106,.32);transform:translateY(-1px)}
.btn-ghost{background:var(--c-surface);color:var(--c-ink);box-shadow:inset 0 0 0 1px var(--c-line)}
.btn-ghost:hover{box-shadow:inset 0 0 0 1px var(--c-line-strong)}
.btn-block{width:100%}
.btn[aria-busy=true]{opacity:.85;cursor:progress}
.btn-primary[aria-busy=true]:hover{background:var(--c-emerald)}
.spin{display:none;width:16px;height:16px;border-radius:50%;border:2px solid rgba(4,35,29,.25);border-top-color:var(--c-on-emerald);animation:spin .8s linear infinite;flex:none}
[aria-busy=true] .spin{display:block}
@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){.spin{animation-duration:2.4s}}

.field{display:block;margin-bottom:16px}
.field>span,.field>label>span,.field-row>span{display:block;font-size:var(--fs-small);color:var(--c-ink);font-weight:500;margin-bottom:6px}
.field input{width:100%;padding:12px 14px;border:1px solid var(--c-line);border-radius:var(--r-sm);font:inherit;color:var(--c-ink);background:var(--c-surface);transition:border-color .15s,box-shadow .15s,background .15s}
.field input::placeholder{color:#A3A9B1}
.field input:focus{outline:none;border-color:var(--c-emerald-text);box-shadow:0 0 0 3px var(--c-emerald-ring)}
.field input:disabled,.field input[readonly]{background:var(--c-subtle);color:var(--c-muted)}
.field.bad input{border-color:#E7A898;background:#FFFBFA}
.field.bad input:focus{border-color:var(--c-hot);box-shadow:0 0 0 3px rgba(180,54,30,.12)}
.ferr{display:none;align-items:flex-start;gap:6px;font-size:var(--fs-caption);color:var(--c-hot);margin-top:6px;line-height:1.4}
.ferr svg{flex:none;margin-top:1px}
.field.bad .ferr{display:flex}
.field.bad .hint{display:none}
.field-row{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:6px}
.field-row>span{margin-bottom:0}
.field-row a{font-size:var(--fs-small)}
.hint{font-size:var(--fs-caption);color:var(--c-muted);margin-top:6px}
.pwbox{position:relative}
.pwbox input{padding-right:72px}
.pwtoggle{position:absolute;right:6px;top:50%;transform:translateY(-50%);padding:6px 10px;border-radius:6px;font-size:13px;color:var(--c-emerald-text);font-weight:500}
.pwtoggle:hover{background:var(--c-subtle)}
.pill{display:inline-flex;align-items:center;gap:7px;padding:5px 12px 5px 9px;border-radius:var(--r-pill);background:var(--c-surface);border:1px solid var(--c-line);font-size:var(--fs-caption);color:var(--c-body);white-space:nowrap}
.pill i{width:8px;height:8px;border-radius:2px;background:var(--c-emerald);display:block;flex:none}
.pill.mint{background:var(--c-emerald-tint);border-color:var(--c-emerald-tint-2);color:var(--c-emerald-text)}
/* Feedback 16/10, bớt xanh lá: badge khoá là hộp màu của khoá (màu đậm của landing), chữ trắng; nhãn giảm giá đỏ */
.pill.course{border:0;color:#fff;font-weight:500;padding:5px 12px;background:#14181F}
.pill.course[data-k=aip]{background:#C2410C}
.pill.course[data-k=ai4da]{background:#1248C2}
.pill.course[data-k=agentic-bi]{background:#00785F}
.pill.sale{background:#DC2626;border-color:#DC2626;color:#fff;font-weight:600}
.overline{font-size:var(--fs-overline);letter-spacing:.08em;text-transform:uppercase;color:var(--c-muted);font-weight:500}

/* Hộp báo dùng chung (lỗi, thành công) */
.alert{display:grid;grid-template-columns:20px minmax(0,1fr);gap:10px;border-radius:var(--r-md);padding:14px 16px;font-size:var(--fs-small);line-height:1.5;margin-bottom:20px}
.alert svg{margin-top:1px}
.alert b{display:block;font-weight:500;color:var(--c-ink);margin-bottom:2px}
.alert.err{background:var(--c-hot-tint)}
.alert.err b{color:var(--c-hot)}
.alert.ok{background:var(--c-emerald-tint)}
.alert.ok b{color:var(--c-emerald-text)}
.alert a{font-weight:500}
.alert .who-email{display:inline;color:var(--c-ink)}

/* ---------- Logo ---------- */
.logo{display:inline-flex;align-items:center;gap:10px;color:var(--c-ink);font-weight:600;letter-spacing:-.01em}
.logo:hover{text-decoration:none}
.logo img{display:block;height:32px;width:auto}
.logo small{font-weight:500;color:var(--c-muted);font-size:13px;padding-left:10px;border-left:1px solid var(--c-line)}

/* ---------- Trang đăng ký, đăng nhập (hai cột) ---------- */
.auth{min-height:100vh;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr)}
.auth-form{background:var(--c-surface);padding:40px clamp(20px,6vw,88px);display:flex;flex-direction:column}
.auth-form .inner{max-width:420px;width:100%;margin:auto 0;padding-top:36px}
.auth-form h1{font-size:34px;margin:28px 0 10px}
.auth-form .lead{font-size:var(--fs-lead);margin-bottom:28px}
.auth-foot{font-size:var(--fs-small);color:var(--c-muted);margin-top:20px}
.auth-side{padding:40px clamp(20px,5vw,72px);display:flex;flex-direction:column;justify-content:center;gap:20px}
.auth-side h2{font-size:26px;max-width:460px}
.preview{display:grid;gap:14px;max-width:520px}
.pv{position:relative;display:grid;grid-template-columns:150px minmax(0,1fr);gap:16px;align-items:center;background:var(--c-surface);border-radius:var(--r-lg);padding:12px;box-shadow:var(--sh-sm)}
.pv b{display:block;color:var(--c-ink);font-weight:500;margin-bottom:2px;line-height:1.3}
.pv p{font-size:var(--fs-small)}
/* Lộ trình thu nhỏ ở cột phụ (phương án 1) */
.mini-h{font-size:var(--fs-small);color:var(--c-muted);margin-bottom:10px}
.mini{list-style:none;background:var(--c-surface);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:6px;max-width:520px}
.mini li{display:grid;grid-template-columns:28px minmax(0,1fr) auto;gap:12px;align-items:center;padding:9px 10px}
.mini li+li{border-top:1px solid var(--c-line)}
.mini .mi{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--c-emerald-tint);color:var(--c-emerald-text)}
.mini .mt{font-size:var(--fs-small);color:var(--c-ink);font-weight:500;line-height:1.35}
.mini .mt small{display:block;font-size:var(--fs-caption);color:var(--c-muted);font-weight:400}
.mini .md{font-size:var(--fs-caption);color:var(--c-muted)}
.pv .k{display:block;font-size:var(--fs-caption);color:var(--c-emerald-text);font-weight:500;margin-bottom:2px}
.pv .tw{position:relative}
.pv .vp{position:absolute;inset:0;display:grid;place-items:center;background:linear-gradient(180deg,rgba(20,24,31,0) 45%,rgba(20,24,31,.35));border-radius:10px}
.pv .vp span{width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center;box-shadow:var(--sh-sm)}
.pv .vd{position:absolute;right:6px;bottom:6px;font-size:10.5px;color:#fff;background:rgba(20,24,31,.7);padding:1px 6px;border-radius:4px;font-variant-numeric:tabular-nums}
.stats{display:flex;gap:28px;flex-wrap:wrap;margin-top:8px}
.stats div{font-size:var(--fs-small)}
.stats strong{display:block;font-size:24px;color:var(--c-ink);font-weight:500;letter-spacing:-.02em}
.side-note{font-size:var(--fs-small);max-width:520px;color:var(--c-body)}
.side-note b{color:var(--c-ink);font-weight:500}
.lockline{display:inline-flex;align-items:center;gap:6px;font-size:var(--fs-caption);color:var(--c-muted)}
.courses{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-size:var(--fs-small)}
.courses .lbl{color:var(--c-muted);margin-right:2px}
.courses .pill{white-space:normal;line-height:1.3}
.mailicon{width:56px;height:56px;border-radius:16px;background:var(--c-emerald-tint);display:grid;place-items:center;margin-top:28px}
@media (max-width:900px){
  .auth{grid-template-columns:minmax(0,1fr)}
  .auth-side{order:2;padding-top:32px;padding-bottom:48px}
  .auth-form{padding-top:24px;padding-bottom:32px}
  .auth-form h1{font-size:28px;margin-top:20px}
  .pv{grid-template-columns:110px minmax(0,1fr)}
}
@media (max-width:700px){
  .auth-side h2{font-size:22px}
  .pv{grid-template-columns:104px minmax(0,1fr);gap:14px;align-items:start}
  .pv p{font-size:13.5px}
}

/* ---------- Ảnh video giả (khung xem trước, không phải video thật) ---------- */
.thumb{position:relative;aspect-ratio:16/9;border-radius:10px;overflow:hidden;background:#1B2230}
.thumb .scr{position:absolute;inset:10% 8% 18% 8%;border-radius:4px;background:#F4F5F3;display:grid;grid-template-columns:1fr 2fr;gap:6%;padding:6%}
.thumb .scr i{display:block;background:#DDE2DD;border-radius:2px}
.thumb .scr i:nth-child(2){background:linear-gradient(180deg,#D3F5EE,#9FE8D9)}
.thumb .cam{position:absolute;right:4%;bottom:4%;width:22%;aspect-ratio:4/3;border-radius:4px;background:#39465C;border:2px solid #1B2230}
.thumb.show .scr{grid-template-columns:repeat(3,1fr)}
.thumb.show .scr i:nth-child(3){background:#FFE3B8}
.thumb.has-img img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.player .thumb.has-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,24,31,0) 55%,rgba(20,24,31,.45));pointer-events:none}

/* ---------- 01 Đăng ký ---------- */
.pg-dang-ky .auth-form .inner{padding-bottom:8px}
fieldset.field{border:0;min-width:0}
fieldset.field legend{display:block;font-size:var(--fs-small);color:var(--c-ink);font-weight:500;margin-bottom:6px;padding:0}
/* Ô chữ "Bạn muốn học gì?" và chip "Bạn muốn học thử khoá nào?" (radio thật, không dùng <select>: mất dấu tiếng Việt khi font web chưa tải) */
.field textarea{width:100%;padding:12px 14px;border:1px solid var(--c-line);border-radius:var(--r-sm);font:inherit;color:var(--c-ink);background:var(--c-surface);resize:vertical;min-height:72px;line-height:1.45;transition:border-color .15s,box-shadow .15s}
.field textarea::placeholder{color:#A3A9B1}
.field textarea:focus{outline:none;border-color:var(--c-emerald-text);box-shadow:0 0 0 3px var(--c-emerald-ring)}
.field textarea:disabled{background:var(--c-subtle);color:var(--c-muted);cursor:not-allowed}
.field.bad textarea{border-color:#E7A898;background:#FFFBFA}
.field.bad textarea:focus{border-color:var(--c-hot);box-shadow:0 0 0 3px rgba(180,54,30,.12)}
/* Một hàng khi vừa cột form; cột hẹp (máy tính 900 đến 1250px, cột form dưới 420px) thì xuống dòng gọn, không tràn sang cột phải */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{position:relative;display:block;min-width:0}
.chip input{position:absolute;opacity:0;width:1px;height:1px}
.chip span{display:flex;align-items:center;min-height:40px;padding:8px 12px;border:1px solid var(--c-line);border-radius:var(--r-sm);font-size:var(--fs-small);color:var(--c-ink);line-height:1.3;white-space:nowrap;cursor:pointer;background:var(--c-surface);transition:border-color .15s,background .15s}
.chip span:hover{border-color:var(--c-line-strong)}
.chip input:checked+span{border-color:var(--c-emerald-text);background:var(--c-emerald-tint);box-shadow:0 0 0 3px var(--c-emerald-ring)}
.chip input:focus-visible+span{outline:2px solid var(--c-emerald-text);outline-offset:2px}
.chip input:disabled+span{cursor:not-allowed;color:var(--c-muted);background:var(--c-subtle)}
.chip input:checked:disabled+span{color:var(--c-emerald-text);background:var(--c-emerald-tint)}
.field.bad .chip span{border-color:#E7A898}
legend .opt{font-weight:400;color:var(--c-muted);font-size:var(--fs-caption);margin-left:6px}
@media (max-width:560px){.chips{display:grid;grid-template-columns:1fr 1fr}.chip span{white-space:normal}}
/* Ô tick đồng ý (màn đăng ký) */
.check{display:grid;grid-template-columns:20px minmax(0,1fr);gap:10px;align-items:start;font-size:var(--fs-caption);color:var(--c-body);line-height:1.5;cursor:pointer}
.check input{width:18px;height:18px;margin:1px 0 0;accent-color:var(--c-emerald-text);cursor:pointer}
.check a{color:var(--c-body);text-decoration:underline;text-underline-offset:2px}
.field.bad .check input{outline:2px solid #E7A898;outline-offset:1px}
.auth-foot.after-btn{margin-top:14px;text-align:center}

/* Cột phải (theo Runway, Emergent, Maze trên Mobbin): một khung lớn, tab khoá, ảnh lớp học thử thu nhỏ, chú thích */
.auth-side.has-stage{justify-content:center;gap:18px;padding:32px clamp(20px,4vw,56px)}
.stage{position:relative;border-radius:var(--r-xl);overflow:hidden;background:radial-gradient(120% 80% at 85% 0%,var(--a-glow),transparent 60%),linear-gradient(180deg,var(--a-bg1),var(--a-bg2));border:1px solid var(--c-line);max-width:600px;width:100%}
.stage::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(20,24,31,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(20,24,31,.045) 1px,transparent 1px);background-size:28px 28px;-webkit-mask-image:linear-gradient(180deg,#000,transparent 85%);mask-image:linear-gradient(180deg,#000,transparent 85%)}
.st-tabs{position:relative;display:flex;gap:4px;padding:14px 16px 0}
.st-tabs button{position:relative;padding:7px 12px;border-radius:var(--r-pill);font-size:13px;color:var(--c-body);white-space:nowrap}
.st-tabs button:hover{color:var(--c-ink)}
.st-tabs button[aria-selected=true]{background:var(--c-surface);color:var(--a-dk);font-weight:500;box-shadow:var(--sh-xs)}
/* Màu theo khoá, lấy từ biến màu chính trên landing từng khoá (14/10); khoá khác dùng màu emerald */
.stage{--a:#00CBA9;--a-dk:#00806A;--a-glow:rgba(0,203,169,.18);--a-bg1:#E3F6F1;--a-bg2:#F1F6F2}
.stage[data-k=aip]{--a:#EA580C;--a-dk:#C2410C;--a-glow:rgba(234,88,12,.20);--a-bg1:#FDEBDD;--a-bg2:#F8F1EB}
.stage[data-k=ai4da]{--a:#1A5FE8;--a-dk:#1248C2;--a-glow:rgba(26,95,232,.20);--a-bg1:#E2EAFB;--a-bg2:#EFF3FA}
.stage[data-k=agentic-bi]{--a:#00C49A;--a-dk:#00785F;--a-glow:rgba(242,200,17,.26);--a-bg1:#DDF4EC;--a-bg2:#F1F6F2}
.st-canvas{position:relative;height:340px;margin:14px 0 0}
.yt{position:absolute;left:20px;right:64px;top:4px;background:var(--c-surface);border-radius:14px;box-shadow:var(--sh-lg);overflow:hidden}
.yt-bar{display:flex;align-items:center;gap:5px;padding:7px 10px;border-bottom:1px solid var(--c-line);background:var(--c-subtle)}
.yt-bar i{width:7px;height:7px;border-radius:50%;background:#D5D9D4}
.yt-bar span{margin-left:10px;color:var(--c-muted);font-size:10px}
.yt-v{position:relative;aspect-ratio:16/9;background:#14181F;overflow:hidden}
.yt-v img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:opacity .25s}
.yt-v::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(20,24,31,.25),transparent 30%,transparent 60%,rgba(20,24,31,.6))}
.yt-tag{position:absolute;z-index:1;left:10px;top:10px;font-size:12.5px;font-weight:500;color:#fff;background:rgba(20,24,31,.66);backdrop-filter:blur(4px);padding:6px 11px;border-radius:10px;line-height:1.3}
.yt-tag b{display:block;font-size:10.5px;font-weight:500;color:rgba(255,255,255,.75)}
.yt-play{position:absolute;z-index:1;left:50%;top:50%;transform:translate(-50%,-50%);width:52px;height:52px;border-radius:50%;background:var(--a);color:#fff;display:grid;place-items:center;box-shadow:0 8px 24px rgba(20,24,31,.35)}
.yt-ctl{position:absolute;z-index:1;left:10px;right:10px;bottom:8px;display:flex;align-items:center;gap:10px}
.yt-pg{flex:1;height:4px;border-radius:2px;background:rgba(255,255,255,.3);overflow:hidden}
.yt-pg u{display:block;width:40%;height:100%;background:var(--a)}
.yt-ctl em{font-style:normal;font-size:10.5px;color:#fff}
.fl{position:absolute;display:flex;align-items:center;gap:12px;background:var(--c-surface);border-radius:12px;padding:8px 14px 8px 8px;box-shadow:0 1px 2px rgba(20,24,31,.06),0 12px 32px rgba(20,24,31,.16)}
.fl-2{right:14px;bottom:10px;max-width:330px}
.fl-img{position:relative;flex:none;width:118px;aspect-ratio:16/10;border-radius:7px;overflow:hidden;background:#14181F}
.fl-img img{width:100%;height:100%;object-fit:cover;display:block;transition:opacity .25s}
.fl-play{position:absolute;inset:0;margin:auto;width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.95);color:var(--a-dk);display:grid;place-items:center}
.fl-play svg{width:11px;height:11px}
.fl small{display:block;font-size:11px;color:var(--a-dk);font-weight:500}
.fl b{display:block;font-size:13px;color:var(--c-ink);font-weight:500;line-height:1.3}
.fl em{display:block;font-style:normal;font-size:11.5px;color:var(--c-muted);margin-top:1px}
.st-cap{position:relative;padding:16px 20px 18px;background:var(--c-surface);border-top:1px solid var(--c-line)}
.st-cap b{display:block;color:var(--c-ink);font-weight:500;font-size:var(--fs-card);line-height:1.35}
.st-cap span{display:block;font-size:var(--fs-small);color:var(--c-body);margin-top:4px}
.st-cap b,.st-cap span{transition:opacity .2s}
.stage.swap .yt-v img,.stage.swap .fl-img img,.stage.swap .st-cap b,.stage.swap .st-cap span{opacity:.2}
.proof{max-width:600px;width:100%;display:grid;gap:12px}
.pf-n{display:flex;align-items:baseline;flex-wrap:wrap;gap:4px 8px;font-size:var(--fs-small);color:var(--c-muted)}
.pf-n .stars{color:#E0A100;letter-spacing:1px;font-size:13px}
.pf-n b{color:var(--c-ink);font-weight:500;font-size:var(--fs-card)}
.pf-n .pf-g{display:inline-flex;align-items:baseline;gap:8px;white-space:nowrap}
.pf-n i{width:1px;height:14px;background:var(--c-line-strong);margin:0 6px;align-self:center}
.pf-co{display:flex;align-items:center;flex-wrap:wrap;gap:6px 14px}
.pf-co>span{font-size:var(--fs-caption);color:var(--c-muted)}
.pf-co ul{list-style:none;display:flex;flex-wrap:wrap;gap:4px 16px}
.pf-co li{font-weight:600;color:#8A929C;letter-spacing:-.01em;font-size:14px}
@media (max-width:900px){
  .auth-side.has-stage{padding:28px 16px 40px}
  .st-canvas{height:300px}
  .yt{right:16px}
  .fl-2{right:10px}
}
@media (max-width:480px){
  .yt{left:12px;right:12px}
  .fl-2{left:12px;right:12px;max-width:none}
  .fl-img{width:96px}
  .st-tabs{overflow-x:auto;scrollbar-width:none;padding:12px 12px 0}
}
@media (prefers-reduced-motion:reduce){.yt-v img,.fl-img img,.st-cap b,.st-cap span{transition:none}}
.summary{display:none;gap:10px;align-items:flex-start;background:var(--c-hot-tint);color:var(--c-hot);border-radius:var(--r-sm);padding:10px 12px;font-size:var(--fs-small);margin:4px 0 12px;line-height:1.4}
.summary.on{display:flex}
.summary svg{flex:none;margin-top:2px}
.consent{font-size:var(--fs-caption);color:var(--c-muted);margin-top:12px;line-height:1.5}
.consent a{color:var(--c-body);text-decoration:underline;text-underline-offset:2px}
.form-hint{margin-top:10px}
.hp{position:absolute!important;left:-10000px!important;top:auto;width:1px;height:1px;overflow:hidden}

/* ---------- 02 Kiểm tra email ---------- */
.pg-kiem-tra-email .auth-form{padding-bottom:64px}
.who-email{color:var(--c-ink);font-weight:500;overflow-wrap:anywhere}
.lead-sub{font-size:var(--fs-small);color:var(--c-muted);margin:-18px 0 24px}
.ke-pill{margin-top:28px}
.ke-pill+.mailicon{margin-top:16px}
.checks{list-style:none;display:grid;gap:12px;margin-top:10px}
.checks li{display:grid;grid-template-columns:22px minmax(0,1fr);gap:10px;align-items:start}
.checks .n{width:22px;height:22px;border-radius:50%;background:var(--c-surface);border:1px solid var(--c-line);display:grid;place-items:center;font-size:12px;color:var(--c-ink);font-weight:500;margin-top:1px}
.checks code{font-family:var(--f);color:var(--c-ink);font-weight:500;overflow-wrap:anywhere}
.notice{background:var(--c-subtle);border-radius:var(--r-md);padding:16px 18px;font-size:var(--fs-small)}
.notice b{color:var(--c-ink);font-weight:500}
.copy{display:inline-flex;align-items:center;gap:5px;font-size:var(--fs-caption);color:var(--c-emerald-text);font-weight:500;margin-left:4px;padding:1px 6px;border-radius:6px}
.copy:hover{background:var(--c-emerald-tint)}
.pg-kiem-tra-email .actions{display:grid;gap:10px;margin:22px 0 16px}
.resend{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:var(--fs-small);color:var(--c-muted);margin-top:20px}
.resend-btn{color:var(--c-emerald-text);font-weight:500;padding:0}
.resend-btn:hover{text-decoration:underline}
.resend-btn:disabled{color:var(--c-muted);cursor:not-allowed;text-decoration:none;font-weight:400}
.resend-btn .num{color:var(--c-ink);font-weight:500}
.flash{display:flex;gap:12px;align-items:flex-start;border-radius:var(--r-md);padding:14px 16px;font-size:var(--fs-small);margin-bottom:16px;background:var(--c-emerald-tint);border:1px solid var(--c-emerald-tint-2)}
.flash svg{flex:none;margin-top:1px}
.flash b{display:block;color:var(--c-ink);font-weight:500;margin-bottom:2px}
.steps4{list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;max-width:520px}
.steps4 li{font-size:var(--fs-caption);color:var(--c-muted);line-height:1.35}
.steps4 li::before{content:"";display:block;height:4px;border-radius:2px;background:var(--c-line);margin-bottom:8px}
.steps4 li.done::before{background:var(--c-emerald)}
.steps4 li.now{color:var(--c-ink);font-weight:500}
.steps4 li.now::before{background:linear-gradient(90deg,var(--c-emerald) 50%,var(--c-line) 50%)}
@media (max-width:700px){.lead-sub{margin-top:-14px}.steps4{gap:6px}}

/* ---------- 03 Đăng nhập ---------- */
.pg-dang-nhap .auth-form .inner{padding-top:28px}
.pg-dang-nhap .auth-form h1{margin-top:22px}
.return{display:flex;gap:10px;align-items:flex-start;background:var(--c-emerald-tint);color:var(--c-emerald-text);border-radius:var(--r-sm);padding:10px 12px;font-size:var(--fs-small);line-height:1.4}
.return svg{flex:none;margin-top:1px}
.return b{font-weight:500}
.mailline{font-size:var(--fs-small);color:var(--c-muted);margin-top:10px;line-height:1.5}
.mailline b{color:var(--c-ink);font-weight:500;overflow-wrap:anywhere}
.pg-dang-nhap .auth-foot{display:grid;gap:6px}
.pv .pill{margin-bottom:8px;white-space:normal;line-height:1.3}

/* ---------- 04 Quên mật khẩu ---------- */
.safe{display:grid;grid-template-columns:20px minmax(0,1fr);gap:10px;margin-top:24px;padding:14px 16px;border-radius:var(--r-md);background:var(--c-subtle);font-size:var(--fs-small);line-height:1.5}
.safe svg{margin-top:2px}
.safe b{color:var(--c-ink);font-weight:500}
.backline{display:flex;align-items:center;gap:6px}
.vsteps{list-style:none;display:grid;gap:0;max-width:460px;counter-reset:s}
.vsteps li{position:relative;display:grid;grid-template-columns:36px minmax(0,1fr);gap:16px;padding-bottom:22px}
.vsteps li:last-child{padding-bottom:0}
.vsteps li::before{counter-increment:s;content:counter(s);width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--c-surface);box-shadow:inset 0 0 0 1px var(--c-line);color:var(--c-ink);font-weight:500;font-size:var(--fs-small);position:relative;z-index:1}
.vsteps li:first-child::before{background:var(--c-emerald-tint);box-shadow:inset 0 0 0 1px var(--c-emerald-tint-2);color:var(--c-emerald-text)}
.vsteps li:not(:last-child)::after{content:"";position:absolute;left:17.5px;top:36px;bottom:0;width:1px;background:var(--c-line)}
.vsteps b{display:block;color:var(--c-ink);font-weight:500;margin:6px 0 2px}
.vsteps p{font-size:var(--fs-small)}
.pg-quen-mat-khau .auth-side h2{max-width:440px;text-wrap:balance}
.pg-quen-mat-khau .side-note{max-width:460px;color:var(--c-muted);border-top:1px solid var(--c-line);padding-top:16px}
.pg-quen-mat-khau .side-note a{font-weight:500}

/* ---------- 05 Đặt mật khẩu lần đầu ---------- */
.steps3{list-style:none;display:flex;align-items:center;gap:10px;margin-top:28px;font-size:var(--fs-caption);color:var(--c-muted)}
.steps3 li{display:flex;align-items:center;gap:8px;white-space:nowrap}
.steps3 li+li::before{content:"";width:22px;height:1px;background:var(--c-line-strong);margin-right:2px}
.steps3 .dot{width:20px;height:20px;border-radius:50%;display:grid;place-items:center;flex:none;font-size:11px;font-weight:600}
.steps3 .done .dot{background:var(--c-emerald-tint);color:var(--c-emerald-text)}
.steps3 .done{color:var(--c-body)}
.steps3 .now .dot{background:var(--c-ink);color:#fff}
.steps3 .now{color:var(--c-ink);font-weight:500}
.field.good input{border-color:var(--c-emerald-text)}
.rules{list-style:none;display:grid;gap:8px;margin:2px 0 22px;padding:14px 16px;background:var(--c-subtle);border-radius:var(--r-md);font-size:var(--fs-small)}
.rules li{display:flex;align-items:center;gap:10px;color:var(--c-muted);transition:color .15s}
.rules .tick{width:18px;height:18px;border-radius:50%;flex:none;display:grid;place-items:center;box-shadow:inset 0 0 0 1.5px var(--c-line-strong);transition:background .15s,box-shadow .15s}
.rules .tick svg{opacity:0;transition:opacity .15s}
.rules li.ok{color:var(--c-ink)}
.rules li.ok .tick{background:var(--c-emerald);box-shadow:none}
.rules li.ok .tick svg{opacity:1}
.rules li.no{color:var(--c-hot)}
.rules li.no .tick{box-shadow:inset 0 0 0 1.5px var(--c-hot)}
.who-line{font-size:var(--fs-small);color:var(--c-muted);margin-top:18px;overflow-wrap:anywhere}
.who-line b{color:var(--c-ink);font-weight:500}
.linkbtn{color:var(--c-emerald-text);font-size:inherit;padding:0;white-space:nowrap}
.linkbtn:hover{text-decoration:underline}
.pg-doi-mat-khau .auth-side .pills{display:flex;gap:8px;flex-wrap:wrap}
.pg-doi-mat-khau .auth-side .pills .pill{white-space:normal;line-height:1.3}
.ctitle{font-size:26px;max-width:480px}
.clead{font-size:var(--fs-card);max-width:480px;margin-top:-8px}
.pv .lk{position:absolute;inset:0;z-index:2;display:grid;place-items:center}
.pv .lk i{width:34px;height:34px;border-radius:50%;background:rgba(255,255,255,.94);display:grid;place-items:center;box-shadow:var(--sh-sm)}
.pv .tw.locked .thumb::after{content:"";position:absolute;inset:0;background:rgba(20,24,31,.28)}
.more{font-size:var(--fs-small);color:var(--c-muted);max-width:520px;padding-top:16px;border-top:1px solid var(--c-line)}
.more b{color:var(--c-ink);font-weight:500}
@media (max-width:700px){
  .steps3{gap:6px}
  .steps3 li+li::before{width:10px}
  .steps3 .lbl{display:none}
  .steps3 .now .lbl{display:inline}
  .ctitle{font-size:22px}
}

/* ---------- Thanh trên cùng của app (trang khoá, tài khoản) ---------- */
.topbar{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--c-line)}
.topbar .in{max-width:1240px;margin:0 auto;padding:12px var(--gutter);display:flex;align-items:center;gap:20px}
/* Nút chọn khoá thả xuống (thay hàng tab) */
.cpick{position:relative;min-width:0;margin-left:8px}
.cpick-btn{display:inline-flex;align-items:center;gap:8px;max-width:100%;padding:7px 12px 7px 14px;border:1px solid var(--c-line);border-radius:var(--r-pill);background:var(--c-surface);font-size:var(--fs-small);color:var(--c-ink)}
.cpick-btn:hover,.cpick-btn[aria-expanded=true]{border-color:var(--c-line-strong)}
.cpick-btn .cl{color:var(--c-muted);flex:none}
.cpick-btn b{font-weight:500;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cpick-btn svg{flex:none;color:var(--c-muted);transition:transform .15s}
.cpick-btn[aria-expanded=true] svg{transform:rotate(180deg)}
.cmenu{display:none;position:absolute;left:0;top:calc(100% + 8px);min-width:300px;max-width:calc(100vw - 32px);background:var(--c-surface);border-radius:var(--r-md);box-shadow:var(--sh-lg);padding:6px;font-size:var(--fs-small);z-index:30}
.cmenu.open{display:block}
.cmenu a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 10px;border-radius:6px;color:var(--c-ink)}
.cmenu a:hover{background:var(--c-subtle);text-decoration:none}
.cmenu a.on{font-weight:500;color:var(--c-emerald-text)}
.me{margin-left:auto;position:relative;flex:none}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--c-emerald-text);color:#fff;font-weight:600;font-size:14px;display:grid;place-items:center}
.menu{display:none;position:absolute;right:0;top:44px;width:240px;background:var(--c-surface);border-radius:var(--r-md);box-shadow:var(--sh-lg);padding:8px;font-size:var(--fs-small)}
.menu.open{display:block}
.menu .who{padding:8px 10px 10px;border-bottom:1px solid var(--c-line);margin-bottom:6px;overflow-wrap:anywhere}
.menu .who b{display:block;color:var(--c-ink);font-weight:500}
.menu a,.menu button{display:block;width:100%;text-align:left;padding:8px 10px;border-radius:6px;color:var(--c-ink)}
.menu a:hover,.menu button:hover{background:var(--c-subtle);text-decoration:none}
.menu a.cur{background:var(--c-subtle)}
@media (max-width:700px){
  .topbar .in{flex-wrap:wrap;gap:10px}
  .cpick{order:3;width:100%;margin-left:0}
  .cpick-btn{width:100%}
  .cpick-btn svg{margin-left:auto}
  .cmenu{right:0;min-width:0}
  .logo small{display:none}
}

/* ---------- 06 Trang khoá, bố cục "lớp học" ---------- */
.wrap{max-width:1240px;margin:0 auto;padding:36px var(--gutter) 80px}
.loading{padding:80px 0;text-align:center;color:var(--c-muted);font-size:var(--fs-small)}
.player{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;background:#1B2230}
.player .thumb{position:absolute;inset:0;border-radius:0;aspect-ratio:auto}
.player .yt,.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.play{position:absolute;inset:0;display:flex;flex-direction:column;gap:10px;align-items:center;justify-content:center;background:linear-gradient(180deg,rgba(20,24,31,0) 40%,rgba(20,24,31,.45))}
.play span{width:68px;height:68px;border-radius:50%;background:rgba(255,255,255,.95);display:grid;place-items:center;box-shadow:var(--sh-lg);transition:transform .15s}
.play:hover span{transform:scale(1.06)}
.play em{font-style:normal;font-size:var(--fs-caption);color:#fff;background:rgba(20,24,31,.62);padding:3px 10px;border-radius:99px}
.player .bar{position:absolute;left:0;right:0;bottom:0;height:5px;background:rgba(255,255,255,.18)}
.player .bar i{display:block;height:100%;width:0;background:var(--c-emerald)}
.player .dur{position:absolute;right:12px;bottom:12px;font-size:12px;color:#fff;background:rgba(20,24,31,.6);padding:2px 8px;border-radius:6px}
.player .perr{position:absolute;inset:0;display:grid;place-items:center;align-content:center;gap:6px;text-align:center;padding:16px;background:#1B2230;color:#C9D0DA;font-size:var(--fs-small)}
.player .perr b{color:#fff;font-weight:500;font-size:var(--fs-card)}
.player .perr .ei{width:44px;height:44px;border-radius:50%;background:rgba(255,255,255,.08);display:grid;place-items:center;margin-bottom:4px}
.watched{font-size:var(--fs-caption);color:var(--c-muted)}
.watched b,.les .s b{color:var(--c-emerald-text);font-weight:500}
.nudge{background:var(--c-emerald-tint);border:1px solid var(--c-emerald-tint-2);border-radius:var(--r-lg);padding:14px;display:grid;grid-template-columns:24px minmax(0,1fr);gap:4px 12px;font-size:var(--fs-small)}
.nudge .ni{grid-row:span 2;width:24px;height:24px;border-radius:50%;background:var(--c-surface);display:grid;place-items:center}
.nudge b{color:var(--c-ink);font-weight:500;font-size:var(--fs-card)}
.nudge .c{color:var(--c-emerald-text);font-weight:500}
.cls{display:grid;grid-template-columns:320px minmax(0,1fr);gap:32px;align-items:start}
.cls-list{position:sticky;top:84px;background:var(--c-surface);border-radius:var(--r-xl);box-shadow:var(--sh-sm);padding:8px;max-height:calc(100vh - 108px);overflow:auto}
.cls-list header{padding:12px 12px 14px;border-bottom:1px solid var(--c-line);margin-bottom:6px}
.cls-list header b{display:block;color:var(--c-ink);font-weight:500;font-size:var(--fs-card)}
.cls-list header>span{font-size:var(--fs-caption);color:var(--c-muted)}
.jr{list-style:none;display:grid;grid-auto-columns:minmax(0,1fr);grid-auto-flow:column;margin-top:14px}
.jr li{position:relative;display:grid;justify-items:center;align-content:start;gap:6px;text-align:center;font-size:11.5px;line-height:1.3;color:var(--c-muted)}
.jr li::before{content:"";position:absolute;top:9px;left:-50%;width:100%;height:2px;background:var(--c-line);z-index:0}
.jr li:first-child::before{display:none}
.jr li.done::before,.jr li.cur::before{background:var(--c-emerald)}
.jr .d{position:relative;z-index:1;width:20px;height:20px;border-radius:50%;background:var(--c-surface);box-shadow:inset 0 0 0 2px var(--c-line);display:grid;place-items:center;color:var(--c-on-emerald)}
.jr li.done .d{background:var(--c-emerald);box-shadow:none}
.jr li.cur .d{box-shadow:inset 0 0 0 2px var(--c-emerald)}
.jr li.cur .d::after{content:"";width:8px;height:8px;border-radius:50%;background:var(--c-emerald)}
.jr li.done,.jr li.cur{color:var(--c-ink)}
.jr .jc{display:block;color:var(--c-muted);font-size:11px}
.jr a{color:inherit}
.jr li.cur a{color:var(--c-emerald-text);font-weight:500}
.les{position:relative;display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;align-items:center;width:100%;text-align:left;padding:9px 10px 11px;border-radius:12px;transition:background .15s}
.les:hover{background:var(--c-subtle)}
.les .ic{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--c-subtle);color:var(--c-muted)}
.les .t{display:block;font-size:var(--fs-small);line-height:1.35;color:var(--c-ink);font-weight:500}
.les .n{display:block;font-size:var(--fs-overline);color:var(--c-muted);letter-spacing:.02em;margin-bottom:1px}
.les .s{display:block;font-size:var(--fs-caption);color:var(--c-muted);margin-top:1px}
.les .d{font-size:var(--fs-caption);color:var(--c-muted);align-self:start;padding-top:2px}
.les .pg{position:absolute;left:50px;right:10px;bottom:4px;height:2px;border-radius:1px;background:var(--c-line);overflow:hidden}
.les .pg i{display:block;height:100%;background:var(--c-emerald)}
.les.open{margin:2px 0}
.les.open .ic{background:var(--c-emerald-tint);color:var(--c-emerald-text)}
.les.on{background:var(--c-emerald-tint)}
.les.on .ic{background:var(--c-emerald);color:var(--c-on-emerald)}
.les.locked{grid-template-columns:28px minmax(0,1fr) auto 14px;align-items:center;padding:9px 10px;min-height:44px}
.les.locked .ls{font-size:var(--fs-caption);color:var(--c-muted)}
.les.locked .no{font-size:var(--fs-caption);color:#A3A9B1;text-align:center;font-variant-numeric:tabular-nums}
.les.locked .t{color:var(--c-muted);font-weight:400;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.les.locked .lk{color:#B7BCC3;display:grid}
.les.locked:hover .t{color:var(--c-ink)}
.les.locked:hover .lk{color:var(--c-emerald-text)}
.les.broken .s{color:var(--c-amber)}
/* Capstone khác màu (feedback 16/10): tông hổ phách thay xanh ngọc */
.les.cap .ic,.les.open.cap .ic{background:var(--c-amber-tint);color:var(--c-amber)}
.les.cap.on{background:var(--c-amber-tint)}
.les.cap.on .ic{background:var(--c-amber);color:#fff}
.les.cap .pg i{background:var(--c-amber)}
/* Đã xem xong: tròn xanh lá đậm đặc, tick trắng, quanh là nền xanh nhạt rồi viền xanh */
.les .ic.ok,.les.on .ic.ok{background:var(--c-emerald-text);color:#fff;box-shadow:0 0 0 3px var(--c-emerald-tint),0 0 0 4px var(--c-emerald)}
.les.cap .ic.ok,.les.cap.on .ic.ok{background:var(--c-amber);box-shadow:0 0 0 3px var(--c-amber-tint),0 0 0 4px var(--c-amber)}
/* Capstone tách khỏi các phase: khối nền hổ phách có viền, cách dòng trên, để mời bấm */
.les.cap{margin-top:10px;background:#FFF6E8;box-shadow:inset 0 0 0 1px #F6D9A8}
.les.cap:hover{background:#FFEFD6}
.les.cap .t{color:#7A4A05}
.les.cap.on{background:#FFEBCC;box-shadow:inset 0 0 0 1.5px var(--c-amber)}
.les.locked.cap .no{color:var(--c-amber)}
/* Tiêu đề phase (khoá chia theo phase và module, như Agentic BI) */
.phase{display:flex;justify-content:space-between;align-items:baseline;gap:10px;width:100%;text-align:left;padding:12px 10px 4px;font-size:var(--fs-caption);color:var(--c-muted);cursor:default}
.grp+.grp .phase{margin-top:6px;border-top:1px solid var(--c-line);padding-top:14px}
.phase .chev{display:none}
/* Thanh tổng thay ba bước (phương án 1) */
.tot{margin-top:12px}
.tot-r{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:var(--fs-caption);color:var(--c-muted)}
.cls-list header .tot-r b{display:inline;font-size:inherit;color:var(--c-ink);font-weight:500}
.tot-r a{display:inline-flex;align-items:center;gap:4px;color:var(--c-emerald-text);font-weight:500;padding:6px 0}
.tot-b{display:block;height:4px;border-radius:2px;background:var(--c-line);overflow:hidden;margin-top:4px}
.tot-b i{display:block;height:100%;background:var(--c-emerald)}
.phase b{font-weight:500;color:var(--c-ink);line-height:1.35}
.phase span{flex:none}
.cls-list.has-plan .les.locked .t{white-space:normal}
.cls-head{margin-bottom:18px}
.cls-head .pills{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.cls-head .pills .pill{white-space:normal;line-height:1.3}
.cls-head h1{font-size:26px;letter-spacing:-.03em;max-width:760px}
.cls-meta .ud{margin-top:12px;font-size:var(--fs-lead);color:var(--c-body);line-height:1.55}
.cls-meta .up{list-style:none;display:grid;gap:8px;margin-top:12px;font-size:var(--fs-small);color:var(--c-ink)}
.cls-meta .up li{display:flex;align-items:flex-start;gap:8px}
.cls-meta .up svg{color:var(--c-emerald-text);flex:none;margin-top:3px}
.cls-head .note{margin-top:12px;font-size:var(--fs-small);display:inline-flex;background:var(--c-amber-tint);color:#7A4A05;border-radius:var(--r-sm);padding:8px 12px}
.cls-main{min-width:0}
.cls-main .player{border-radius:var(--r-xl);box-shadow:var(--sh-sm)}
.cls-under{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start;margin-top:20px}
.cls-meta{padding:0 4px;min-width:0}
.cls-meta .tag{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.cls-meta h2{font-size:24px;letter-spacing:-.025em}
.cls-meta p{margin-top:8px;max-width:720px}
.cls-meta .by{display:block;margin-top:8px;font-size:var(--fs-small);color:var(--c-muted)}
.pn{display:flex;margin-top:20px;padding-top:16px;border-top:1px solid var(--c-line)}
.pn-b{display:flex;align-items:center;gap:12px;max-width:100%;text-align:left;padding:6px 10px 6px 6px;margin-left:-6px;border-radius:12px;transition:background .15s}
.pn-b:hover{background:var(--c-surface)}
.pn-b.nx{margin-left:auto;margin-right:-6px;text-align:right;flex-direction:row-reverse;padding:6px 6px 6px 10px}
.pn-b .thumb{width:72px;flex:none;border-radius:6px}
.pn-b small{display:flex;align-items:center;gap:6px;font-size:var(--fs-caption);color:var(--c-muted)}
.pn-b.nx small{justify-content:flex-end}
.pn-b b{display:block;color:var(--c-ink);font-weight:500;font-size:var(--fs-small);line-height:1.35}
.cls-buy{background:var(--c-surface);border-radius:var(--r-xl);box-shadow:var(--sh-lg);padding:22px;display:grid;gap:16px;align-content:start}
.cls-buy .overline{margin-bottom:8px}
.old{text-decoration:line-through;color:var(--c-muted);font-size:var(--fs-small)}
.cls-buy .now{font-size:34px;color:var(--c-ink);font-weight:500;letter-spacing:-.03em;line-height:1.15}
.cls-buy .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:4px}
.cls-buy ul{list-style:none;display:grid;gap:8px;font-size:var(--fs-small);margin-top:14px;padding-top:14px;border-top:1px solid var(--c-line)}
.cls-buy li{display:flex;gap:10px;align-items:flex-start}
.cls-buy li svg{flex:none;margin-top:3px}
.acts{display:grid;gap:10px;align-content:start}
.cls-buy .small{font-size:var(--fs-caption);color:var(--c-muted);text-align:center}
.fitnote{font-size:var(--fs-small);background:var(--c-amber-tint);color:#7A4A05;border-radius:var(--r-sm);padding:8px 12px}
.np-t{font-size:var(--fs-small);margin-top:6px}
.mbar{display:none}
.dlg-bg{position:fixed;inset:0;z-index:120;background:rgba(20,24,31,.42);display:none;align-items:center;justify-content:center;padding:16px}
.dlg-bg.open{display:flex}
.dlg{background:var(--c-surface);border-radius:var(--r-xl);box-shadow:var(--sh-lg);width:100%;max-width:440px;padding:26px;position:relative}
.dlg .li{width:44px;height:44px;border-radius:14px;background:var(--c-emerald-tint);color:var(--c-emerald-text);display:grid;place-items:center;margin-bottom:16px}
.dlg .overline{display:block;padding-right:36px}
.dlg h3{font-size:22px;margin:8px 0 8px}
.dlg p{font-size:var(--fs-small)}
.dlg .pr{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap;margin:18px 0;padding:14px 16px;background:var(--c-subtle);border-radius:var(--r-md)}
.dlg .pr b{font-size:24px;color:var(--c-ink);font-weight:500;letter-spacing:-.02em}
.dlg .pr s{color:var(--c-muted);font-size:var(--fs-small)}
.dlg .acts{margin-top:18px}
.dlg .x{position:absolute;right:12px;top:12px;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:var(--c-muted)}
.dlg .x:hover{background:var(--c-subtle)}
@media (max-width:1120px) and (min-width:961px){.cls-under{grid-template-columns:minmax(0,1fr)}}
@media (max-width:960px){
  .cls{display:flex;flex-direction:column;align-items:stretch;gap:0}
  .cls-main,.cls-under{display:contents}
  .cls-main .player{order:1}
  .cls-meta{order:2;margin-top:16px}
  .cls-list{order:3;position:static;max-height:none;margin-top:24px}
  .phase{cursor:pointer;align-items:center;min-height:44px}
  .phase .chev{display:grid;transition:transform .15s;color:var(--c-muted)}
  .grp.open .phase .chev{transform:rotate(90deg)}
  .grp:not(.open) .grp-i{display:none}
  /* Điện thoại: tên phần đang xem và nội dung phần đó đứng ngay trên video (feedback 16/10), không dồn xuống cuối trang */
  .cls-head{order:0;margin:0 0 16px}
  .cls-buy{order:5;margin-top:16px}
  .cls-head h1{font-size:24px}
  .mbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--c-surface);border-top:1px solid var(--c-line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));align-items:center;gap:12px;box-shadow:0 -8px 24px rgba(20,24,31,.06)}
  .mbar[hidden]{display:none}
  .mbar .p{flex:1;min-width:0;line-height:1.25}
  .mbar .p s,.mbar .p small{font-size:12px;color:var(--c-muted)}
  .mbar .p .pill{padding:1px 8px;font-size:11.5px}
  .mbar .p b{display:block;color:var(--c-ink);font-weight:500;font-size:18px}
  .mbar .btn{flex:none}
  .pg-khoa .wrap{padding-bottom:110px}
  .dlg-bg{align-items:flex-end;padding:0}
  .dlg{max-width:none;border-radius:var(--r-xl) var(--r-xl) 0 0;padding:24px 20px calc(24px + env(safe-area-inset-bottom))}
}
@media (max-width:700px){
  .wrap{padding-top:24px}
  .cls-meta{padding-top:16px}
  .cls-meta h2{font-size:20px}
  .cls-main .player{border-radius:14px}
  .pn-b .thumb{width:60px}
  .cls-buy{padding:20px}
}

/* ---------- 07 Tài khoản ---------- */
.acct{max-width:720px;margin:0 auto;padding:32px var(--gutter) 96px}
.back{display:inline-flex;align-items:center;gap:6px;font-size:var(--fs-small);color:var(--c-body);margin-bottom:20px}
.back:hover{color:var(--c-ink);text-decoration:none}
.acct-head{margin-bottom:24px}
.acct-head h1{font-size:var(--fs-h2)}
.acct-head p{margin-top:8px;font-size:var(--fs-card)}
.card{background:var(--c-surface);border-radius:var(--r-xl);box-shadow:var(--sh-sm);padding:24px 28px;margin-bottom:20px}
.card-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:6px}
.card-head h2{font-size:var(--fs-h3)}
.card .sub{font-size:var(--fs-small);margin-bottom:18px}
.info{display:grid;grid-template-columns:180px minmax(0,1fr);border-top:1px solid var(--c-line)}
.info dt,.info dd{padding:13px 0;border-bottom:1px solid var(--c-line);font-size:var(--fs-small)}
.info dt{color:var(--c-muted)}
.info dd{color:var(--c-ink);min-width:0;overflow-wrap:anywhere}
.info dd .pill{white-space:normal}
.info dd.pre{white-space:pre-line}
.lock{display:flex;gap:10px;align-items:flex-start;margin-top:16px;font-size:var(--fs-caption);color:var(--c-muted)}
.lock svg{flex:none;margin-top:1px}
.lock a{font-weight:500;white-space:nowrap}
.forgot{font-size:var(--fs-caption);float:right;font-weight:400}
.grid2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 16px}
.sessions{display:flex;gap:10px;align-items:flex-start;background:var(--c-subtle);border-radius:var(--r-md);padding:12px 14px;font-size:var(--fs-small);margin:4px 0 20px}
.sessions svg{flex:none;margin-top:2px}
.sessions b{color:var(--c-ink);font-weight:500}
.pg-tai-khoan .actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.done{text-align:center;padding:12px 0 6px}
.done .ok{width:56px;height:56px;border-radius:16px;background:var(--c-emerald-tint);display:grid;place-items:center;margin:0 auto 16px}
.done h2{font-size:var(--fs-h3);margin-bottom:8px}
.done p{font-size:var(--fs-small);max-width:440px;margin:0 auto 20px}
.done .actions{justify-content:center}
@media (max-width:700px){
  .acct{padding-top:20px}
  .card{padding:20px 18px;border-radius:18px}
  .info{grid-template-columns:minmax(0,1fr)}
  .info dt{padding:12px 0 2px;border-bottom:0}
  .info dd{padding:0 0 12px}
  .grid2{grid-template-columns:minmax(0,1fr)}
  .pg-tai-khoan .actions .btn{width:100%}
}

/* ---------- 08 Trang lỗi, phiên hết hạn, bảo trì ---------- */
.st{min-height:100vh;display:flex;flex-direction:column}
.st-head{padding:20px var(--gutter);max-width:1240px;width:100%;margin:0 auto}
.st-main{flex:1;display:flex;align-items:center;justify-content:center;padding:24px var(--gutter) 96px}
.st-card{width:100%;max-width:520px;text-align:center}
.px{display:inline-grid;grid-template-columns:repeat(7,10px);gap:3px;padding:18px;border-radius:20px;background:var(--c-surface);box-shadow:var(--sh-sm);margin-bottom:28px}
.px b{width:10px;height:10px;border-radius:2px;background:transparent}
.px b.e{background:var(--c-emerald)}
.px b.o{background:#E3E6E1}
.px b.e.blink{animation:blink 1.6s steps(1) infinite}
@keyframes blink{50%{background:#E3E6E1}}
@media (prefers-reduced-motion:reduce){.px b.e.blink{animation:none}}
.st-card .overline{display:block;margin-bottom:12px}
.st-card h1{font-size:34px;letter-spacing:-.03em;margin-bottom:12px;text-wrap:balance}
.st-card .lead{font-size:var(--fs-lead);max-width:460px;margin:0 auto;text-wrap:pretty}
.st-card .acts{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:28px}
.facts{margin:24px auto 0;max-width:420px;text-align:left;background:var(--c-surface);border:1px solid var(--c-line);border-radius:var(--r-md);padding:14px 18px;font-size:var(--fs-small);display:grid;gap:8px}
.facts div{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:start}
.facts svg{margin-top:3px}
.facts b{color:var(--c-ink);font-weight:500}
.help{margin:18px auto 0;max-width:420px;font-size:var(--fs-caption);color:var(--c-muted);text-wrap:pretty}
.help a{font-weight:500;white-space:nowrap}
.st-foot{padding:0 var(--gutter) 40px;text-align:center;font-size:var(--fs-caption);color:var(--c-muted)}
@media (max-width:700px){
  .st-head{padding-top:16px}
  .st-main{align-items:flex-start;padding-top:36px}
  .px{grid-template-columns:repeat(7,8px);gap:3px;padding:14px;border-radius:16px;margin-bottom:22px}
  .px b{width:8px;height:8px}
  .st-card h1{font-size:26px}
  .st-card .acts{flex-direction:column}
  .st-card .acts .btn{width:100%}
}
.mt20{margin-top:20px}.mt16{margin-top:16px}
.auth-side>div>h2{margin-top:14px}