/* CTA trong bài blog KHA (specs/blog-cta/BRIEF-LAP.md, 07/10/2026). Theme ép img rộng 100% nên ảnh nhỏ ghi !important. */
:root{--k-mag:#F41E92;--k-tim:#6B21A8;--k-tim-nhat:#F6F0FF;--k-chu:#1F1B2E;--k-phu:#5B5670;--k-vien:#E9E3F5;
--k-cam1:#FF7A1A;--k-cam2:#FFB02E;--k-vang:#FFD54A;--k-navy:#15224F}
.kc,.kc *{box-sizing:border-box}
.kc{font-family:inherit;color:var(--k-chu)}
.kc a{text-decoration:none!important}
.kc .nut-cam{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 22px;border-radius:12px;
 background:linear-gradient(180deg,var(--k-cam2),var(--k-cam1));border:2px solid var(--k-vang);color:#fff!important;font-weight:700;font-size:16px;
 box-shadow:0 6px 16px -8px rgba(255,122,26,.8);transition:transform .15s}
.kc .nut-cam:hover{transform:translateY(-1px)}
.kc .nut-gg{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:0 18px;border-radius:12px;
 background:#fff;border:1px solid #DADCE0;color:#3C4043!important;font-weight:600;font-size:15px}
.kc .nut-gg img{width:20px!important;height:20px!important;display:block;flex:none;margin:0!important}
.kc .nut-cam span,.kc .nut-gg span{display:block;line-height:1.2}
.kc .tag-free{display:inline-flex;align-items:center;height:22px;padding:0 8px;border-radius:6px;background:#16A34A;color:#fff!important;font-size:12px;font-weight:700;line-height:1}
.kc .tag-pro{display:inline-flex;align-items:center;height:22px;padding:0 8px;border-radius:6px;background:var(--k-navy);color:var(--k-vang)!important;font-size:12px;font-weight:800;line-height:1;letter-spacing:.02em}
.kc .phut{font-variant-numeric:tabular-nums;color:var(--k-phu);font-size:13px;line-height:1}
.kc img{max-width:100%}
html.kc-da-dn .kc .nut-gg,html.kc-da-dn .kc-cua{display:none!important}

/* ---------- A: Hùng nhỏ AI nhắn riêng ---------- */
.ka-note{display:flex;gap:12px;align-items:flex-start;margin:26px 0 30px}
.ka-note .ka-ava{width:48px!important;height:48px!important;border-radius:50%;object-fit:cover;flex:none;margin:0!important;background:#F3EEF9;border:2px solid #fff;box-shadow:0 0 0 1px var(--k-vien)}
.ka-bubble{position:relative;flex:1;min-width:0;background:var(--k-tim-nhat);border-radius:4px 16px 16px 16px;padding:14px 16px 12px}
.ka-ten{display:flex;flex-wrap:wrap;align-items:baseline;column-gap:8px;row-gap:2px;margin-bottom:6px}
.ka-ten b{font-weight:800!important;font-size:15px;color:var(--k-tim);line-height:1.3}
.ka-ten span{font-size:12.5px;color:var(--k-phu);line-height:1.35}
.content-main .ka-bubble p.ka-loi{margin:0 0 10px!important;font-size:16px;line-height:1.65;color:var(--k-chu)!important}
.ka-link{display:inline-flex;align-items:center;gap:6px;color:var(--k-mag)!important;font-weight:700;font-size:15.5px}
.ka-link span{display:block;line-height:1.2}.ka-link svg{display:block;flex:none}
.ka-ky{display:block;text-align:right;font-family:"Segoe Script","Bradley Hand","Brush Script MT",cursive;font-size:15px;color:var(--k-tim);opacity:.85;margin-top:4px;line-height:1.2}
.ka-cuoi{margin:36px 0 30px;padding-top:24px;border-top:1px dashed var(--k-vien)}
.ka-hang{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}

/* ---------- C: video ngay trong bài ---------- */
.kc-player{margin:36px 0 32px}
.kc-khung{position:relative;border-radius:16px;overflow:hidden;background:#140C24;aspect-ratio:16/9}
.kc-khung .kc-poster{display:block;width:100%!important;height:100%!important;object-fit:cover;margin:0!important;max-width:none}
.kc-tren{position:absolute;left:0;right:0;top:0;padding:12px 14px;background:linear-gradient(180deg,rgba(10,4,24,.7),transparent)}
.kc-nhan{display:inline-flex;align-items:center;gap:8px;color:#fff;font-size:13px;font-weight:600}
.kc-nhan>span:last-child{line-height:1;color:#fff!important}
.kc-play{position:absolute;left:50%;top:50%;width:78px;height:78px;margin:-39px 0 0 -39px;border-radius:50%;border:0;background:var(--k-mag);color:#fff;
 display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 0 0 8px rgba(244,30,146,.25);padding:0 0 0 5px;transition:transform .2s}
.kc-play:hover{transform:scale(1.06)}
.kc-play svg{display:block}
.kc-duoi{position:absolute;left:0;right:0;bottom:0;display:flex;align-items:center;gap:12px;padding:10px 14px;background:linear-gradient(0deg,rgba(10,4,24,.75),transparent)}
.kc-thanh{flex:1;height:4px;border-radius:4px;background:rgba(255,255,255,.3)}
.kc-thanh i{display:block;width:0;height:100%;background:var(--k-mag)}
.kc-tg{color:#fff;font-size:12.5px;font-variant-numeric:tabular-nums;line-height:1}
.kc-cua{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:20px;
 background:rgba(20,10,40,.88);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);text-align:center;opacity:0;pointer-events:none;transition:opacity .25s}
.kc-player.mo-cua .kc-cua{opacity:1;pointer-events:auto}
.content-main .kc-cua p.kc-cua-tieu{color:#fff!important;font-weight:800;font-size:20px;margin:0!important;line-height:1.35}
.content-main .kc-cua p.kc-cua-phu{color:#E9E1FA!important;font-size:14px;margin:0 0 4px!important;max-width:420px;line-height:1.5}
.kc-cua .nut-gg{min-width:260px}
.kc-cua .kc-cua-mail{color:#fff!important;font-size:14px;text-decoration:underline!important;text-underline-offset:3px}
.kc-ten{padding:12px 2px 0}
.kc-ten b{display:block;font-size:17px;line-height:1.4;font-weight:700!important}
.kc-ten span{font-size:13.5px;color:var(--k-phu)}
.kc-tiep{margin-top:16px;padding:14px;border-radius:14px;background:#F7F5FB}
.content-main .kc-tiep p.kc-tiep-tieu{display:flex;align-items:center;gap:8px;font-weight:700;font-size:14.5px;margin:0 0 10px!important;line-height:1}
.kc-tiep-tieu span{display:block;line-height:1.2}
.kc-tiep-tieu img{display:block;width:54px!important;height:auto!important;margin:0!important}
.content-main .kc-tiep ul{list-style:none!important;margin:0!important;padding:0!important;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.content-main .kc-tiep li{margin:0!important;padding:0!important;list-style:none!important}
.kc-tiep li:before,.kc-tiep li::marker{display:none!important;content:none!important}
.kc-tiep li a{display:block;color:var(--k-chu)!important}
.kc-tiep li img{display:block;width:100%!important;border-radius:8px;margin:0!important;filter:grayscale(.4) brightness(.85)}
.kc-tiep-chu{display:block;min-width:0}
.kc-tiep li b{display:block;font-size:13px;line-height:1.35;margin-top:6px;font-weight:600!important}
.kc-tiep li .dong{display:flex;align-items:center;gap:6px;margin-top:5px}

/* ---------- B: bài học đi kèm ---------- */
.blog-banner .kb-ray{position:sticky;top:100px}
.kb-ray{padding:14px 14px 12px;border-radius:16px;background:#fff;border:1px solid var(--k-vien);box-shadow:0 10px 30px -22px rgba(70,30,120,.4)}
.kb-tieu{font-weight:800;font-size:15.5px;line-height:1.3}
.kb-chuong{font-size:12.5px;color:var(--k-phu);margin:3px 0 10px;line-height:1.4}
.kb-tien{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--k-phu);margin-bottom:10px}
.kb-tien-thanh{flex:1;height:6px;border-radius:6px;background:#EFEAF7;overflow:hidden}
.kb-tien-thanh i{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--k-tim),var(--k-mag));transition:width .2s}
.kb-tien span{line-height:1;white-space:nowrap}
.kc ol.kb-ds{list-style:none!important;margin:0 0 12px!important;padding:0!important}
.kc ol.kb-ds li{margin:0 0 4px!important;padding:0!important;list-style:none!important}
.kc ol.kb-ds li::marker{content:none}
.kb-ds li>a{display:flex;gap:9px;align-items:center;padding:5px 6px;border-radius:10px;color:var(--k-chu)!important}
.kb-ds li.mo>a{background:var(--k-tim-nhat);outline:2px solid #E4D4FB;flex-direction:column;align-items:stretch}
.kb-ds li.mo img{display:block;width:100%!important;height:auto!important;border-radius:8px;margin:0!important}
.kb-ds li.khoa>a{align-items:flex-start}
.kb-ds li.khoa>a:hover{background:#FAF8FD}
.kb-khoa{display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:8px;background:#EEF0F7;color:var(--k-navy);flex:none}
.kb-khoa svg{display:block}
.kb-ds b{display:block;font-size:13px;line-height:1.35;font-weight:600!important}
.kb-ds li.mo b{font-weight:700!important;font-size:14.5px}
.kb-ds .dong{display:flex;align-items:center;gap:8px;margin-top:5px}
.kb-ds li.khoa .tag-pro{height:19px;font-size:11px;padding:0 6px}
.kb-ds li.khoa .kb-khoa{width:24px;height:24px}
.kb-ray .nut-cam,.kb-sheet .nut-cam{display:flex;width:100%}
.kb-ray .nut-cam{min-height:44px;font-size:15px;padding:0 12px}
.kb-ray .nut-gg,.kb-sheet .nut-gg{display:flex;width:100%;margin-top:8px;font-size:14px;white-space:nowrap}
.kb-ray .nut-gg{min-height:42px;padding:0 10px;gap:8px;font-size:13.5px}
.kb-pro{font-size:12px;color:var(--k-phu);margin:10px 0 0!important;line-height:1.5}
.kb-pro a{color:var(--k-tim)!important;font-weight:700}
.kc-toc a{color:var(--k-mag)!important;font-weight:700}
.kb-chip{display:flex;align-items:center;gap:10px;margin:-4px 0 18px;padding:9px 12px;border-radius:10px;border:1px solid var(--k-vien);background:#FCFAFF;color:var(--k-chu)!important}
.kb-chip:hover{border-color:#D6C2F5}
.kb-chip-ic{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--k-mag);color:#fff;flex:none}
.kb-chip.pro .kb-chip-ic{background:var(--k-navy);color:var(--k-vang)}
.kb-chip-ic svg{display:block}
.kb-chip-chu{flex:1;min-width:0;display:flex;flex-direction:column;gap:4px}
.kb-chip-chu small{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:12.5px;color:var(--k-phu);line-height:1}
.kb-chip-chu small .tag-free,.kb-chip-chu small .tag-pro{height:19px;font-size:11px;padding:0 6px}
.kb-chip-chu b{font-size:15px;line-height:1.35;font-weight:700!important}
.kb-tab,.kb-sheet{display:none}
@media (max-width:767px){
 .blog-banner .kb-ray{display:none}
 .kb-tab{display:block;position:fixed;left:10px;right:84px;z-index:60;bottom:calc(var(--kb-day,64px) + 10px);opacity:0;visibility:hidden;transform:translateY(16px);
  transition:opacity .25s,transform .25s,visibility 0s .25s}
 .kb-tab.hien{opacity:1;visibility:visible;transform:none;transition:opacity .25s,transform .25s}
 .kb-tab-nut{display:flex;align-items:center;gap:8px;width:100%;min-height:48px;padding:0 12px;border-radius:14px;border:1px solid var(--k-vien);background:#fff;color:var(--k-chu);
  font:inherit;font-weight:700;font-size:14px;box-shadow:0 10px 26px -12px rgba(40,10,80,.45);cursor:pointer}
 .kb-tab-so{display:flex;gap:4px;flex:none}
 .kb-tab-chu{flex:1;text-align:left;line-height:1.2;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
 .kb-tab-nut svg{display:block;flex:none}
 .kb-sheet{display:block;position:fixed;inset:0;z-index:100000;pointer-events:none;visibility:hidden;transition:visibility 0s .3s}
 .kb-sheet-nen{position:absolute;inset:0;background:rgba(20,10,40,.45);opacity:0;transition:opacity .25s}
 .kb-sheet-than{position:absolute;left:0;right:0;bottom:0;max-height:84vh;overflow:auto;background:#fff;border-radius:20px 20px 0 0;
  padding:10px 16px calc(20px + env(safe-area-inset-bottom));transform:translateY(100%);transition:transform .3s}
 .kb-sheet-keo{width:40px;height:4px;border-radius:4px;background:#DDD6EA;margin:0 auto 12px}
 .kb-sheet-dong{position:absolute;top:8px;right:10px;width:34px;height:34px;border:0;border-radius:50%;background:#F3F0F8;color:var(--k-phu);font-size:22px;line-height:1;cursor:pointer}
 .kb-sheet.mo{pointer-events:auto;visibility:visible;transition:none}.kb-sheet.mo .kb-sheet-nen{opacity:1}.kb-sheet.mo .kb-sheet-than{transform:none}
 .kb-sheet .kb-ds li.mo>a{flex-direction:row;align-items:center}
 .kb-sheet .kb-ds li.mo img{width:120px!important;flex:none}
}
@media (max-width:767px){
 .ka-note{gap:10px}
 .ka-note .ka-ava{width:36px!important;height:36px!important}
 .ka-hang>a{width:100%}
 .kc-player{margin:28px 0}
 .kc-khung{aspect-ratio:auto}
 .kc-khung .kc-poster{height:auto!important}
 .kc-play{width:62px;height:62px;margin:-31px 0 0 -31px}
 .kc-cua{position:relative;inset:auto;display:none;opacity:1;background:#1A0F33}
 .kc-player.mo-cua .kc-cua{display:flex}
 .kc-cua .nut-gg{min-width:0;width:100%}
 .kc-player.mo-cua .kc-play,.kc-player.mo-cua .kc-duoi{display:none}
 .content-main .kc-tiep ul{grid-template-columns:1fr}
 .kc-tiep li a{display:flex;gap:10px;align-items:center}
 .kc-tiep li img{width:96px!important;flex:none}
 .kc-tiep li b{margin-top:0}
}
@media (prefers-reduced-motion:reduce){.kb-tab,.kb-sheet-than,.kb-sheet-nen,.kc-cua,.kc .nut-cam,.kc-play{transition:none!important}}