/* CSS công cụ (nguồn tinhkts.com) — bọc trong .tk, nhận diện X8 */
.tk{--ink:#0A0A0A;           
  --ink-2:#141518;
  --ink-soft:#C9C9C9;      
  --muted:#8F8F8F;
  --paper:#0A0A0A;         
  --paper-2:#141518;       
  --paper-3:#1C1E22;
  --white:#141518;         
  --text:#E9E9E9;          
  --head:#FFFFFF;          
  
  --clay:#FFAE0F;
  --clay-deep:#F9D45D;
  --clay-soft:#F6D38D;
  --sage:#FFAE0F;
  --brass:#FFAE0F;
  --gold:#FFAE0F;
  --gold-deep:#F9D45D;
  --gold-soft:#F6D38D;
  --cream:#FFEAC9;
  --gold-grad:linear-gradient(135deg,#FFD36B 0%,#FFAE0F 46%,#E08A00 100%);
  --line:rgba(255,255,255,.10);
  --line-soft:rgba(255,255,255,.06);
  --line-gold:rgba(255,174,15,.34);
  --shadow-sm:0 2px 18px rgba(0,0,0,.35);
  --shadow:0 24px 64px rgba(0,0,0,.5);
  --shadow-lg:0 38px 96px rgba(0,0,0,.62);
  --serif:"Playfair Display",Georgia,serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --cond:"Oswald",var(--sans);
  --black:"Archivo",var(--sans);
  --wrap:1220px;
  --radius:6px;
  --ease:cubic-bezier(.22,.61,.36,1);}
.tk *{box-sizing:border-box;margin:0;padding:0}
.tk{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
.tk{font-family:var(--sans);color:var(--text);background:var(--paper);
  line-height:1.75;font-size:16px;font-weight:400;overflow-x:hidden;
  -webkit-font-smoothing:antialiased;}
.tk img{max-width:100%;display:block}
.tk a{color:inherit;text-decoration:none;transition:color .3s var(--ease)}
.tk ul{list-style:none}
.tk button{font-family:inherit;cursor:pointer;border:none;background:none}
.tk h1,.tk h2{font-family:var(--black);font-weight:400;line-height:1.06;letter-spacing:-.01em;color:var(--head)}
.tk h3,.tk h4{font-family:var(--sans);font-weight:700;line-height:1.22;letter-spacing:-.005em;color:var(--head)}
.tk .wrap{max-width:var(--wrap);margin:0 auto;padding:0 30px}
.tk .eyebrow{font-family:var(--cond);font-size:.76rem;font-weight:600;letter-spacing:.3em;
  text-transform:uppercase;color:var(--gold);display:inline-flex;align-items:center;gap:12px;}
.tk .eyebrow::before{content:"";width:30px;height:1.5px;background:var(--gold)}
.tk .eyebrow.center{justify-content:center}
.tk .eyebrow.center::after{content:"";width:30px;height:1.5px;background:var(--gold)}
.tk .section{padding:120px 0}
.tk .section-head{max-width:760px;margin:0 auto 66px}
.tk .section-head.left{margin-left:0}
.tk .section-head h2{font-size:clamp(2rem,4.4vw,3.3rem);margin:20px 0 0;letter-spacing:-.01em;text-transform:uppercase;color:var(--gold)}
.tk .section-head h2::after{content:"";display:block;width:78px;height:4px;background:var(--gold-grad);margin-top:22px;border-radius:2px}
.tk .section-head.center h2::after,.tk .center .section-head h2::after{margin-left:auto;margin-right:auto}
.tk .section-head p{color:var(--muted);margin-top:20px;font-size:1.08rem;line-height:1.7}
.tk .center{text-align:center}
.tk .center .section-head h2::after{margin-left:auto;margin-right:auto}
.tk .btn{display:inline-flex;align-items:center;gap:10px;font-family:var(--sans);
  font-size:.8rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;
  padding:16px 34px;border-radius:2px;transition:all .35s var(--ease);cursor:pointer;}
.tk .btn-gold{background:var(--gold-grad);color:#1a1300;font-weight:700}
.tk .btn-gold:hover{filter:brightness(1.08);transform:translateY(-2px);box-shadow:0 16px 38px rgba(255,174,15,.32);color:#1a1300}
.tk .btn-dark{background:#17181B;color:#fff;border:1px solid var(--line-gold)}
.tk .btn-dark:hover{background:#1F2126;transform:translateY(-2px);color:var(--gold);border-color:var(--gold)}
.tk .btn-ghost{border:1px solid rgba(255,255,255,.4);color:var(--text)}
.tk .btn-ghost:hover{background:var(--gold-grad);border-color:transparent;color:#1a1300}
.tk .btn-line{border:1px solid var(--gold);color:var(--gold)}
.tk .btn-line:hover{background:var(--gold-grad);border-color:transparent;color:#1a1300}
.tk .site-header{position:fixed;top:0;left:0;right:0;z-index:1000;padding:24px 0;transition:all .4s var(--ease)}
.tk .site-header.scrolled{padding:13px 0;background:rgba(10,10,10,.92);backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line-gold)}
.tk .header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.tk .brand{display:flex;align-items:center;gap:13px}
.tk .brand-mark{width:46px;height:46px;border-radius:50%;background:var(--gold-grad);color:#1a1300;
  display:grid;place-items:center;font-family:var(--black);font-size:1.25rem;font-weight:400;flex:0 0 auto;}
.tk .brand-text{line-height:1.05;display:flex;flex-direction:column}
.tk .brand-text .name{display:block;font-family:var(--black);font-size:1.3rem;font-weight:400;color:#fff}
.tk .brand-text .sub{display:block;font-family:var(--cond);font-size:.58rem;letter-spacing:.22em;text-transform:uppercase;color:var(--gold-soft);font-weight:500;margin-top:3px}
.tk .site-header:not(.scrolled):not(.light-page) .brand-text .name{color:#fff}
.tk .site-header:not(.scrolled):not(.light-page) .brand-text .sub{color:var(--gold-soft)}
.tk .site-header:not(.scrolled):not(.light-page) .brand-mark{background:var(--gold-grad)}
.tk .main-nav{display:flex;align-items:center;gap:21px;flex-wrap:nowrap}
.tk .main-nav a{font-size:.83rem;font-weight:500;letter-spacing:.03em;color:var(--text);position:relative;padding:4px 0;white-space:nowrap}
.tk .site-header:not(.scrolled):not(.light-page) .main-nav>a{color:rgba(255,255,255,.92)}
.tk .site-header:not(.scrolled):not(.light-page) .header-cta .btn-line{border-color:var(--gold);color:var(--gold)}
.tk .main-nav a:not(.btn)::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1.5px;background:var(--gold);transition:width .3s var(--ease)}
.tk .main-nav a:not(.btn):hover::after{width:100%}
.tk .main-nav a:hover{color:var(--gold)}
.tk .header-cta{display:flex;align-items:center;gap:16px}
.tk .header-phone{font-size:.83rem;font-weight:600;display:flex;align-items:center;gap:7px;color:var(--gold)}
.tk .site-header:not(.scrolled):not(.light-page) .header-phone{color:var(--gold)}
.tk .menu-toggle{display:none;flex-direction:column;gap:5px;width:30px;height:24px;justify-content:center;z-index:1100}
.tk .menu-toggle span{display:block;height:2px;width:100%;background:#fff;transition:all .3s var(--ease)}
.tk .site-header:not(.scrolled):not(.light-page) .menu-toggle span{background:#fff}
.tk .menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);background:var(--gold)}
.tk .menu-toggle.open span:nth-child(2){opacity:0}
.tk .menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);background:var(--gold)}
.tk .hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;background:var(--ink)}
.tk .hero-bg{position:absolute;inset:0;z-index:0}
.tk .hero-slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity 1.6s var(--ease);transform:scale(1.05);animation:kb 9s linear infinite alternate}
.tk .hero-slide.active{opacity:1}
@keyframes kb{to{transform:scale(1.14)}}
.tk .hero-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,6,6,.92) 0%,rgba(6,6,6,.7) 46%,rgba(6,6,6,.3) 100%)}
.tk .hero .wrap{position:relative;z-index:2;width:100%}
.tk .hero-inner{max-width:820px;color:#fff;padding:130px 0 60px}
.tk .hero .eyebrow{color:var(--gold)}
.tk .hero .eyebrow::before{background:var(--gold)}
.tk .hero h1{color:#fff;font-family:var(--black);font-size:clamp(2.6rem,6vw,5rem);font-weight:400;margin:28px 0 26px;line-height:1.04;letter-spacing:-.015em;text-transform:uppercase}
.tk .hero h1 em{font-family:var(--serif);font-style:italic;color:var(--gold);font-weight:500;text-transform:none;letter-spacing:0}
.tk .hero-lead{font-size:1.2rem;color:rgba(255,255,255,.82);max-width:610px;font-weight:300;line-height:1.8}
.tk .hero-actions{display:flex;gap:18px;margin-top:44px;flex-wrap:wrap}
.tk .hero-stats{display:flex;gap:56px;margin-top:66px;flex-wrap:wrap}
.tk .hero-stats .st .n{font-family:var(--black);font-size:2.7rem;font-weight:400;color:#fff;line-height:1}
.tk .hero-stats .st .n span{color:var(--gold)}
.tk .hero-stats .st .l{font-family:var(--cond);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(255,255,255,.66);margin-top:8px}
.tk .hero-dots{position:absolute;bottom:40px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:12px}
.tk .hero-dots button{width:34px;height:3px;background:rgba(255,255,255,.28);transition:background .3s}
.tk .hero-dots button.active{background:var(--gold)}
.tk .about-split{display:grid;grid-template-columns:0.9fr 1.1fr;gap:76px;align-items:center}
.tk .about-visual{position:relative}
.tk .about-visual img{width:100%;height:620px;object-fit:cover;border-radius:4px;box-shadow:var(--shadow)}
.tk .about-badge{position:absolute;bottom:-28px;right:-28px;background:var(--gold-grad);color:#1a1300;padding:26px 32px;border-radius:4px;box-shadow:var(--shadow-lg);text-align:center}
.tk .about-badge .n{font-family:var(--black);font-size:2.3rem;line-height:1}
.tk .about-badge .l{font-family:var(--cond);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;margin-top:6px;color:rgba(26,19,0,.78)}
.tk .about-visual .sig{position:absolute;top:26px;left:26px;font-family:var(--serif);font-style:italic;font-size:1.6rem;color:var(--gold-soft);text-shadow:0 2px 14px rgba(0,0,0,.65)}
.tk .about-body h2{font-size:clamp(1.9rem,3.8vw,2.9rem);margin:20px 0 24px;letter-spacing:-.01em;color:var(--gold);text-transform:uppercase}
.tk .about-body p{color:var(--ink-soft);margin-bottom:18px;font-size:1.05rem}
.tk .about-body .quote{border-left:3px solid var(--gold);padding:8px 0 8px 26px;margin:30px 0;font-family:var(--serif);font-style:italic;font-size:1.5rem;color:var(--cream);line-height:1.4}
.tk .about-facts{display:flex;gap:44px;margin:32px 0 36px;flex-wrap:wrap}
.tk .about-facts .f .n{font-family:var(--black);font-size:2.1rem;color:var(--gold);font-weight:400}
.tk .about-facts .f .l{font-size:.82rem;color:var(--muted)}
.tk .services{background:var(--ink-2);color:#fff}
.tk .services .eyebrow{color:var(--gold)}
.tk .services .eyebrow::after,.tk .services .eyebrow::before{background:var(--gold)}
.tk .services .section-head h2{color:var(--gold)}
.tk .services .section-head p{color:rgba(255,255,255,.6)}
.tk .svc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.09)}
.tk .svc{background:var(--ink-2);padding:46px 34px;transition:background .4s var(--ease);position:relative}
.tk .svc:hover{background:#1E2026}
.tk .svc .ic{width:52px;height:52px;color:var(--gold);margin-bottom:28px}
.tk .svc .ic svg{width:100%;height:100%}
.tk .svc h3{color:#fff;font-size:1.35rem;margin-bottom:14px}
.tk .svc p{color:rgba(255,255,255,.6);font-size:.94rem;margin-bottom:20px}
.tk .svc .price{font-size:.86rem;color:var(--gold);font-weight:600}
.tk .svc .num{position:absolute;top:30px;right:32px;font-family:var(--black);font-size:1rem;color:rgba(255,174,15,.3)}
.tk .proc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:6px;overflow:hidden}
.tk .proc-step{background:var(--paper-2);padding:44px 36px;position:relative;transition:background .35s var(--ease)}
.tk .proc-step:hover{background:#1E2026}
.tk .proc-step .pn{font-family:var(--black);font-size:2.8rem;font-weight:400;color:var(--gold);line-height:1;margin-bottom:16px}
.tk .proc-step h3{font-size:1.3rem;margin-bottom:10px}
.tk .proc-step p{color:var(--ink-soft);font-size:.96rem}
.tk .proc-step .dur{margin-top:14px;font-family:var(--cond);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-deep);font-weight:600}
.tk .promise-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.tk .promise{text-align:center;padding:10px}
.tk .promise .pic{width:66px;height:66px;margin:0 auto 20px;border-radius:50%;background:var(--gold-grad);display:grid;place-items:center;color:#1a1300}
.tk .promise .pic svg{width:30px;height:30px}
.tk .promise h3{font-size:1.2rem;margin-bottom:8px}
.tk .promise p{color:var(--ink-soft);font-size:.92rem}
.tk .price-table{max-width:940px;margin:0 auto;background:var(--paper-2);border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:var(--shadow-sm)}
.tk .price-row{display:grid;grid-template-columns:1.5fr 1fr;gap:20px;padding:24px 34px;border-bottom:1px solid var(--line-soft);align-items:center}
.tk .price-row:last-child{border-bottom:none}
.tk .price-row.head{background:var(--gold-grad);padding:20px 34px}
.tk .price-row.head .pi,.tk .price-row.head .pv{color:#1a1300;font-family:var(--cond);font-size:.8rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700}
.tk .price-row .pi{font-weight:500;color:#F2F2F2;font-size:1.02rem}
.tk .price-row .pi small{display:block;color:var(--muted);font-weight:400;font-size:.82rem;margin-top:2px}
.tk .price-row .pv{font-family:var(--black);font-size:1.1rem;color:var(--gold);font-weight:400;text-align:right}
.tk .price-row.hot{background:rgba(255,174,15,.07);box-shadow:inset 3px 0 0 var(--gold)}
.tk .price-row.hot .pv{color:var(--gold-deep);font-size:1.25rem}
.tk .price-note{text-align:center;margin-top:24px;color:var(--muted);font-size:.94rem;max-width:820px;margin-left:auto;margin-right:auto}
.tk .proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.tk .proj{position:relative;overflow:hidden;border-radius:4px;cursor:pointer;background:var(--ink)}
.tk .proj img{width:100%;height:350px;object-fit:cover;transition:transform .8s var(--ease),opacity .5s}
.tk .proj:hover img{transform:scale(1.08);opacity:.72}
.tk .proj-cap{position:absolute;left:0;right:0;bottom:0;padding:28px;background:linear-gradient(0deg,rgba(6,6,6,.92),transparent);color:#fff;transform:translateY(14px);opacity:.95;transition:all .45s var(--ease)}
.tk .proj:hover .proj-cap{transform:translateY(0)}
.tk .proj-cap .t{font-family:var(--sans);font-weight:700;font-size:1.3rem}
.tk .proj-cap .m{font-family:var(--cond);font-size:.76rem;letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:4px}
.tk .proj.wide{grid-column:span 2}
.tk .proj.wide img{height:350px}
.tk .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:34px}
.tk .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:34px}
.tk .card{background:var(--paper-2);border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .45s var(--ease);display:flex;flex-direction:column;border:1px solid var(--line-soft)}
.tk .card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-gold)}
.tk .card-img{position:relative;overflow:hidden;aspect-ratio:16/10}
.tk .card-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.tk .card:hover .card-img img{transform:scale(1.06)}
.tk .card-tag{position:absolute;top:14px;left:14px;background:var(--gold-grad);color:#1a1300;font-family:var(--cond);font-size:.7rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.tk .card-body{padding:28px 28px 32px;flex:1;display:flex;flex-direction:column}
.tk .card-meta{font-size:.76rem;color:var(--muted);letter-spacing:.04em;margin-bottom:12px;display:flex;gap:14px;flex-wrap:wrap}
.tk .card-body h3{font-size:1.32rem;line-height:1.3;margin-bottom:12px}
.tk .card-body h3 a:hover{color:var(--gold)}
.tk .card-body p{color:var(--ink-soft);font-size:.95rem;margin-bottom:20px;flex:1}
.tk .card-link{font-family:var(--cond);font-size:.8rem;font-weight:600;letter-spacing:.13em;text-transform:uppercase;color:var(--gold);display:inline-flex;align-items:center;gap:8px}
.tk .card-link .arw{transition:transform .3s var(--ease)}
.tk .card:hover .card-link .arw{transform:translateX(6px)}
.tk .book-card{background:var(--paper-2);border:1px solid var(--line-soft);border-radius:6px;overflow:hidden;display:flex;flex-direction:column;transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .45s var(--ease);box-shadow:var(--shadow-sm)}
.tk .book-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-gold)}
.tk .book-cover{position:relative;aspect-ratio:3/4;background:var(--paper-3);overflow:hidden;display:grid;place-items:center;padding:28px}
.tk .book-cover .mock{width:78%;aspect-ratio:3/4.2;border-radius:3px 7px 7px 3px;box-shadow:-6px 10px 28px rgba(0,0,0,.55);background:linear-gradient(135deg,#1a1a1a,#0b0b0b);color:#fff;padding:28px 22px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}
.tk .book-cover .mock::before{content:"";position:absolute;left:0;top:0;bottom:0;width:7px;background:var(--gold-grad)}
.tk .book-cover .mock .kt{font-family:var(--cond);font-size:.6rem;letter-spacing:.24em;text-transform:uppercase;color:var(--gold)}
.tk .book-cover .mock .bt{font-family:var(--black);font-size:1.3rem;line-height:1.16;text-transform:uppercase}
.tk .book-cover .mock .ba{font-size:.64rem;letter-spacing:.1em;color:rgba(255,255,255,.6);text-transform:uppercase}
.tk .book-cover.c1 .mock{background:linear-gradient(140deg,#1E2318,#0B0D08)}
.tk .book-cover.c2 .mock{background:linear-gradient(140deg,#2A1B0C,#100901)}
.tk .book-cover.c3 .mock{background:linear-gradient(140deg,#1B1F26,#0A0C10)}
.tk .book-cover.c4 .mock{background:linear-gradient(140deg,#2A1410,#120606)}
.tk .book-ribbon{position:absolute;top:16px;right:-30px;transform:rotate(45deg);background:var(--gold-grad);color:#1a1300;font-family:var(--cond);font-size:.64rem;font-weight:700;letter-spacing:.1em;padding:5px 40px;text-transform:uppercase}
.tk .book-info{padding:26px 26px 30px;flex:1;display:flex;flex-direction:column}
.tk .book-info .b-cat{font-family:var(--cond);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:8px}
.tk .book-info h3{font-size:1.24rem;margin-bottom:10px}
.tk .book-info p{font-size:.9rem;color:var(--ink-soft);margin-bottom:18px;flex:1}
.tk .book-price{display:flex;align-items:baseline;gap:10px;margin-bottom:18px}
.tk .book-price .now{font-family:var(--black);font-size:1.55rem;font-weight:400;color:#fff}
.tk .book-price .now.free{color:var(--gold)}
.tk .book-price .old{font-size:.95rem;color:var(--muted);text-decoration:line-through}
.tk .book-price .note{font-size:.95rem;color:var(--gold-soft);font-weight:600;letter-spacing:.02em}
.tk .book-info .btn{justify-content:center;width:100%}
.tk .course-card{background:var(--paper-2);border:1px solid var(--line-soft);border-radius:6px;overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow-sm);transition:transform .45s var(--ease),box-shadow .45s var(--ease),border-color .45s var(--ease)}
.tk .course-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:var(--line-gold)}
.tk .course-img{position:relative;aspect-ratio:16/10;overflow:hidden}
.tk .course-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s var(--ease)}
.tk .course-card:hover .course-img img{transform:scale(1.06)}
.tk .course-img .lvl{position:absolute;bottom:14px;left:14px;background:rgba(10,10,10,.86);border:1px solid var(--line-gold);color:var(--gold);font-family:var(--cond);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.tk .course-img .badge-soon{position:absolute;top:14px;right:14px;background:var(--gold-grad);color:#1a1300;font-family:var(--cond);font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:6px 13px;border-radius:2px}
.tk .course-body{padding:28px;flex:1;display:flex;flex-direction:column}
.tk .course-body h3{font-size:1.34rem;margin-bottom:12px;line-height:1.28}
.tk .course-body p{font-size:.94rem;color:var(--ink-soft);margin-bottom:18px}
.tk .course-feats{margin-bottom:22px}
.tk .course-feats li{font-size:.9rem;color:var(--ink-soft);padding:8px 0 8px 27px;position:relative;border-bottom:1px solid var(--line-soft)}
.tk .course-feats li:last-child{border-bottom:none}
.tk .course-feats li::before{content:"";position:absolute;left:0;top:14px;width:14px;height:8px;border-left:2px solid var(--gold);border-bottom:2px solid var(--gold);transform:rotate(-45deg)}
.tk .course-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.tk .course-foot .cp{font-family:var(--black);font-size:1.45rem;font-weight:400;color:var(--gold)}
.tk .course-foot .cp small{font-size:.8rem;color:var(--muted);font-family:var(--sans);font-weight:400}
.tk .testi{background:var(--ink-2)}
.tk .testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.tk .testi-card{background:#0E0F12;border:1px solid var(--line-soft);padding:38px 34px;border-radius:6px;box-shadow:var(--shadow-sm);position:relative}
.tk .testi-card .stars{color:var(--gold);letter-spacing:3px;margin-bottom:16px;font-size:.9rem}
.tk .testi-card .qmark{position:absolute;top:22px;right:30px;font-family:var(--serif);font-size:4.2rem;color:rgba(255,174,15,.14);line-height:1}
.tk .testi-card p{font-size:1rem;color:var(--ink-soft);margin-bottom:22px;position:relative;z-index:1}
.tk .testi-who{display:flex;align-items:center;gap:14px}
.tk .testi-who .av{width:48px;height:48px;border-radius:50%;background:var(--gold-grad);color:#1a1300;display:grid;place-items:center;font-family:var(--black);font-size:1.05rem;font-weight:400}
.tk .testi-who .nm{font-weight:600;font-size:.95rem;color:#fff}
.tk .testi-who .rl{font-size:.8rem;color:var(--muted)}
.tk .faq{max-width:840px;margin:0 auto}
.tk .faq-item{border-bottom:1px solid var(--line);padding:6px 0}
.tk .faq-q{width:100%;text-align:left;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:26px 4px;font-family:var(--sans);font-size:1.12rem;font-weight:700;color:#fff;cursor:pointer}
.tk .faq-q:hover{color:var(--gold)}
.tk .faq-q .pl{flex:0 0 auto;width:26px;height:26px;position:relative;transition:transform .35s var(--ease)}
.tk .faq-q .pl::before,.tk .faq-q .pl::after{content:"";position:absolute;background:var(--gold);border-radius:2px}
.tk .faq-q .pl::before{left:0;top:50%;width:100%;height:2px;transform:translateY(-50%)}
.tk .faq-q .pl::after{top:0;left:50%;height:100%;width:2px;transform:translateX(-50%);transition:opacity .3s}
.tk .faq-item.open .faq-q .pl::after{opacity:0}
.tk .faq-item.open .faq-q .pl{transform:rotate(180deg)}
.tk .faq-a{max-height:0;overflow:hidden;transition:max-height .4s var(--ease)}
.tk .faq-a p{color:var(--ink-soft);padding:0 4px 26px;font-size:1rem;line-height:1.75}
.tk .cta-band{position:relative;padding:130px 0;color:#fff;text-align:center;overflow:hidden;background:var(--ink)}
.tk .cta-band .cta-bg{position:absolute;inset:0;background-size:cover;background-position:center}
.tk .cta-band .cta-bg::after{content:"";position:absolute;inset:0;background:rgba(6,6,6,.86)}
.tk .cta-band .wrap{position:relative;z-index:2}
.tk .cta-band h2{color:var(--gold);font-size:clamp(2rem,4.4vw,3.4rem);margin:22px 0 22px;letter-spacing:-.01em;text-transform:uppercase}
.tk .cta-band p{color:rgba(255,255,255,.8);max-width:620px;margin:0 auto 38px;font-size:1.1rem}
.tk .cta-band .eyebrow{color:var(--gold)}
.tk .cta-band .eyebrow::before,.tk .cta-band .eyebrow::after{background:var(--gold)}
.tk .cta-actions{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.tk .site-footer{background:#060606;color:rgba(255,255,255,.68);padding:86px 0 34px;border-top:1px solid var(--line-gold)}
.tk .footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.3fr;gap:50px;padding-bottom:54px;border-bottom:1px solid rgba(255,255,255,.1)}
.tk .footer-brand .brand-mark{margin-bottom:18px}
.tk .footer-brand p{font-size:.94rem;line-height:1.75;max-width:320px;margin-top:16px}
.tk .footer-col h4{color:var(--gold);font-family:var(--cond);font-size:.82rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;margin-bottom:22px}
.tk .footer-col ul li{margin-bottom:12px}
.tk .footer-col ul li a{font-size:.92rem;color:rgba(255,255,255,.62)}
.tk .footer-col ul li a:hover{color:var(--gold)}
.tk .footer-contact li{display:flex;gap:12px;font-size:.92rem;margin-bottom:14px;align-items:flex-start}
.tk .footer-contact li svg{width:17px;height:17px;color:var(--gold);flex:0 0 auto;margin-top:3px}
.tk .footer-social{display:flex;gap:12px;margin-top:20px}
.tk .footer-social a{width:38px;height:38px;border:1px solid rgba(255,255,255,.2);border-radius:50%;display:grid;place-items:center;font-size:.78rem;transition:all .3s}
.tk .footer-social a:hover{background:var(--gold-grad);border-color:transparent;color:#1a1300}
.tk .footer-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:26px;font-size:.82rem;color:rgba(255,255,255,.45);flex-wrap:wrap;gap:10px}
.tk .page-hero{position:relative;padding:190px 0 96px;background:var(--ink);color:#fff;overflow:hidden}
.tk .page-hero .ph-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.28}
.tk .page-hero .ph-bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,6,6,.66),rgba(6,6,6,.94))}
.tk .page-hero .wrap{position:relative;z-index:2}
.tk .page-hero .eyebrow{color:var(--gold)}
.tk .page-hero .eyebrow::before{background:var(--gold)}
.tk .page-hero h1{color:#fff;font-family:var(--black);font-size:clamp(2.2rem,5vw,4rem);margin:22px 0 20px;max-width:920px;letter-spacing:-.015em;text-transform:uppercase;line-height:1.06}
.tk .page-hero p{color:rgba(255,255,255,.78);max-width:640px;font-size:1.12rem}
.tk .crumbs{font-size:.82rem;color:rgba(255,255,255,.55);margin-bottom:8px}
.tk .crumbs a:hover{color:var(--gold)}
.tk .crumbs span{color:var(--gold)}
.tk .about-hero{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.tk .about-hero-img{position:relative}
.tk .about-hero-img img{width:100%;height:660px;object-fit:cover;border-radius:4px;box-shadow:var(--shadow)}
.tk .timeline{max-width:840px;margin:0 auto}
.tk .tl-item{display:grid;grid-template-columns:140px 1fr;gap:38px;padding:36px 0;border-bottom:1px solid var(--line);position:relative}
.tk .tl-item:last-child{border-bottom:none}
.tk .tl-year{font-family:var(--black);font-size:1.85rem;font-weight:400;color:var(--gold)}
.tk .tl-body h3{font-size:1.28rem;margin-bottom:8px}
.tk .tl-body p{color:var(--ink-soft)}
.tk .values-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.tk .value{padding:38px 32px;background:var(--paper-2);border:1px solid var(--line-soft);border-radius:6px;transition:border-color .35s var(--ease)}
.tk .value:hover{border-color:var(--line-gold)}
.tk .value .vn{font-family:var(--black);font-size:2.3rem;color:var(--gold);line-height:1;margin-bottom:14px;font-weight:400}
.tk .value h3{font-size:1.24rem;margin-bottom:10px}
.tk .value p{color:var(--ink-soft);font-size:.95rem}
.tk .blog-featured{display:grid;grid-template-columns:1.15fr .85fr;gap:0;background:var(--paper-2);border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);margin-bottom:60px;border:1px solid var(--line-soft)}
.tk .blog-featured .bf-img{overflow:hidden;min-height:420px}
.tk .blog-featured .bf-img img{width:100%;height:100%;object-fit:cover}
.tk .blog-featured .bf-body{padding:56px 50px;display:flex;flex-direction:column;justify-content:center}
.tk .blog-featured .bf-body h2{font-size:1.9rem;margin:14px 0 18px;line-height:1.2;color:var(--gold);text-transform:uppercase}
.tk .blog-featured .bf-body p{color:var(--ink-soft);margin-bottom:26px}
.tk .blog-toolbar{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:46px;justify-content:center}
.tk .chip{font-size:.8rem;font-weight:500;letter-spacing:.03em;padding:9px 22px;border:1px solid var(--line);border-radius:40px;color:var(--ink-soft);transition:all .3s;cursor:pointer}
.tk .chip:hover,.tk .chip.active{background:var(--gold-grad);color:#1a1300;border-color:transparent;font-weight:600}
.tk .article-wrap{max-width:780px;margin:0 auto;padding:70px 30px 40px}
.tk .article-body{font-size:1.12rem;line-height:1.88;color:var(--ink-soft)}
.tk .article-body h2{font-size:1.7rem;margin:50px 0 18px;color:var(--gold);text-transform:uppercase}
.tk .article-body h3{font-size:1.32rem;margin:36px 0 14px;color:#fff}
.tk .article-body p{margin-bottom:22px}
.tk .article-body ul,.tk .article-body ol{margin:0 0 24px 22px}
.tk .article-body ul li,.tk .article-body ol li{margin-bottom:11px;padding-left:8px}
.tk .article-body ul li{list-style:none;position:relative;padding-left:26px}
.tk .article-body ul li::before{content:"";position:absolute;left:0;top:12px;width:8px;height:8px;background:var(--gold);border-radius:50%}
.tk .article-body ol{list-style:decimal;margin-left:26px}
.tk .article-body strong{color:var(--gold-deep);font-weight:600}
.tk .article-body blockquote{border-left:3px solid var(--gold);background:var(--paper-2);padding:26px 32px;margin:34px 0;font-family:var(--serif);font-size:1.4rem;font-style:italic;color:var(--cream);border-radius:0 6px 6px 0;line-height:1.4}
.tk .article-body .callout{background:var(--paper-2);border:1px solid var(--line-gold);border-radius:6px;padding:28px 32px;margin:32px 0}
.tk .article-body .callout .ct{font-weight:700;color:var(--gold);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:8px;font-family:var(--cond)}
.tk .article-body img{border-radius:6px;margin:34px 0;width:100%}
.tk .article-lead{font-size:1.34rem;line-height:1.7;color:var(--cream);font-family:var(--serif);margin-bottom:36px;font-style:italic}
.tk .article-meta-top{display:flex;gap:20px;color:var(--muted);font-size:.86rem;margin-bottom:10px;flex-wrap:wrap;align-items:center}
.tk .article-share{display:flex;gap:12px;align-items:center;margin:46px 0;padding:24px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.tk .article-share span{font-family:var(--cond);font-size:.84rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.tk .article-share a{width:38px;height:38px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;transition:all .3s}
.tk .article-share a:hover{background:var(--gold-grad);color:#1a1300;border-color:transparent}
.tk .author-box{display:flex;gap:22px;align-items:center;background:var(--paper-2);border:1px solid var(--line-soft);border-radius:6px;padding:32px;margin:42px 0;box-shadow:var(--shadow-sm)}
.tk .author-box img{width:90px;height:90px;border-radius:50%;object-fit:cover;flex:0 0 auto}
.tk .author-box .ab-name{font-family:var(--black);font-size:1.2rem;color:#fff;text-transform:uppercase}
.tk .author-box .ab-role{font-family:var(--cond);font-size:.86rem;color:var(--gold);margin-bottom:8px;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.tk .author-box p{font-size:.94rem;color:var(--ink-soft)}
.tk .toc{background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:28px 32px;margin:36px 0}
.tk .toc .tt{font-family:var(--cond);font-weight:600;font-size:.84rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin-bottom:14px}
.tk .toc ol{margin-left:20px;color:var(--ink-soft)}
.tk .toc ol li{margin-bottom:8px}
.tk .toc ol li a:hover{color:var(--gold)}
.tk .contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:70px;align-items:start}
.tk .contact-info .ci{display:flex;gap:18px;padding:24px 0;border-bottom:1px solid var(--line)}
.tk .contact-info .ci:last-child{border-bottom:none}
.tk .contact-info .ci .ic{width:48px;height:48px;border-radius:50%;background:var(--gold-grad);display:grid;place-items:center;flex:0 0 auto;color:#1a1300}
.tk .contact-info .ci .ic svg{width:20px;height:20px}
.tk .contact-info .ci .lbl{font-family:var(--cond);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.tk .contact-info .ci .val{font-size:1.05rem;font-weight:500;color:#F2F2F2}
.tk .contact-form{background:var(--paper-2);padding:46px;border-radius:6px;box-shadow:var(--shadow);border:1px solid var(--line-gold)}
.tk .contact-form h3{font-size:1.5rem;margin-bottom:8px}
.tk .contact-form .fsub{color:var(--muted);margin-bottom:26px;font-size:.95rem}
.tk .form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.tk .field{margin-bottom:18px}
.tk .field label{display:block;font-size:.82rem;font-weight:600;margin-bottom:8px;color:var(--text)}
.tk .field input,.tk .field select,.tk .field textarea{width:100%;padding:14px 16px;border:1px solid var(--line);border-radius:3px;font-family:var(--sans);font-size:.95rem;background:#0C0D10;color:var(--text);transition:border .3s}
.tk .field input::placeholder,.tk .field textarea::placeholder{color:#6B6B6B}
.tk .field input:focus,.tk .field select:focus,.tk .field textarea:focus{outline:none;border-color:var(--gold)}
.tk .field select option{background:#0C0D10;color:var(--text)}
.tk .field textarea{resize:vertical;min-height:110px}
.tk .map-embed{border-radius:6px;overflow:hidden;box-shadow:var(--shadow-sm);height:340px;border:1px solid var(--line-soft)}
.tk .map-embed iframe{width:100%;height:100%;border:0}
.tk .hashtags{display:flex;flex-wrap:wrap;gap:9px;margin:28px 0 4px}
.tk .tagchip{font-size:.82rem;font-weight:500;color:var(--gold);background:var(--paper-2);border:1px solid var(--line-gold);padding:6px 14px;border-radius:40px}
.tk .reveal{opacity:0;transform:translateY(34px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.tk .reveal.in{opacity:1;transform:none}
.tk .reveal.d1{transition-delay:.1s}
.tk .reveal.d2{transition-delay:.2s}
.tk .reveal.d3{transition-delay:.3s}
.tk .float-contact{position:fixed;right:22px;bottom:22px;z-index:900;display:flex;flex-direction:column;gap:12px}
.tk .float-contact a{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;box-shadow:var(--shadow);color:#fff;font-weight:700;font-size:.7rem;transition:transform .3s}
.tk .float-contact a:hover{transform:scale(1.1)}
.tk .float-contact .zalo{background:#0068ff}
.tk .float-contact .phone{background:#25a244;animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(37,162,68,.5)}70%{box-shadow:0 0 0 16px rgba(37,162,68,0)}100%{box-shadow:0 0 0 0 rgba(37,162,68,0)}}
@media(max-width:1024px){.tk .svc-grid,.tk .proc-grid{grid-template-columns:repeat(2,1fr)}
.tk .promise-grid{grid-template-columns:repeat(2,1fr);gap:36px}
.tk .footer-grid{grid-template-columns:1fr 1fr;gap:38px}
.tk .about-split,.tk .about-hero,.tk .contact-grid{grid-template-columns:1fr;gap:48px}
.tk .about-visual img,.tk .about-hero-img img{height:480px}
.tk .blog-featured{grid-template-columns:1fr}
.tk .blog-featured .bf-img{min-height:300px}}
@media(max-width:820px){.tk .main-nav{position:fixed;top:0;right:0;bottom:0;width:min(80vw,340px);background:#0C0D10;border-left:1px solid var(--line-gold);flex-direction:column;justify-content:center;gap:26px;padding:60px 40px;transform:translateX(100%);transition:transform .45s var(--ease);box-shadow:-20px 0 60px rgba(0,0,0,.6);z-index:1050}
.tk .main-nav.open{transform:translateX(0)}
.tk .main-nav a{color:#fff !important;font-size:1.1rem}
.tk .site-header:not(.scrolled):not(.light-page) .main-nav>a{color:#fff !important}
.tk .main-nav a.btn-line{color:var(--gold) !important}
.tk .menu-toggle{display:flex}
.tk .header-phone{display:none}
.tk .grid-3,.tk .testi-grid,.tk .proj-grid,.tk .values-grid{grid-template-columns:1fr}
.tk .grid-2{grid-template-columns:1fr}
.tk .proj.wide{grid-column:span 1}
.tk .section{padding:80px 0}
.tk .hero-stats{gap:34px}
.tk .about-badge{right:12px;bottom:-20px;padding:18px 22px}
.tk .form-row{grid-template-columns:1fr}
.tk .tl-item{grid-template-columns:80px 1fr;gap:20px}
.tk .footer-grid{grid-template-columns:1fr}
.tk .blog-featured .bf-body{padding:34px 28px}}
@media(max-width:560px){.tk .wrap{padding:0 20px}
.tk .hero-actions{flex-direction:column;align-items:stretch}
.tk .hero-actions .btn{justify-content:center}
.tk .svc-grid,.tk .proc-grid,.tk .promise-grid{grid-template-columns:1fr}
.tk .book-cover .mock{width:70%}}
.tk{line-height:1.95}
.tk .section p,.tk .sub,.tk .about-body p,.tk .tl-body p,.tk .value p,.tk .testi-card p,.tk .faq-a p,.tk .blog-featured .bf-body p{line-height:2.02}
.tk .sub{font-size:1.03rem;line-height:2.1;color:#DCDCDC;max-width:820px}
.tk .about-body p{font-size:1rem;line-height:2.05;color:#DEDEDE}
.tk .proc-step p{font-size:.95rem;line-height:1.98;color:#DADADA}
.tk .promise p{font-size:.93rem;line-height:1.95;color:#DADADA}
.tk .card-body p{font-size:.95rem;line-height:1.95;color:#DADADA}
.tk .book-info p{font-size:.92rem;line-height:1.95;color:#DADADA}
.tk .course-body p{font-size:.95rem;line-height:1.98;color:#DADADA}
.tk .course-feats li{font-size:.93rem;line-height:1.8;padding:11px 0 11px 27px;color:#DADADA}
.tk .testi-card p{font-size:1rem;line-height:2.05;color:#DEDEDE}
.tk .faq-a p{font-size:1rem;line-height:2.02;color:#DEDEDE}
.tk .tl-body p{font-size:1rem;line-height:2.05;color:#DEDEDE}
.tk .value p{font-size:.95rem;line-height:1.98;color:#DADADA}
.tk .article-body{font-size:1.06rem;line-height:2.05;color:#E0E0E0}
.tk .article-body p{margin-bottom:22px}
.tk .author-box p{font-size:.94rem;line-height:1.9;color:#DADADA}
.tk .contact-form p,.tk .contact-form .fsub{line-height:1.9}
.tk h3,.tk h4{line-height:1.35}
.tk h1,.tk h2,.tk h3,.tk h4{font-family:var(--cond);font-weight:600;line-height:1.18;letter-spacing:0;color:var(--head)}
.tk h1{letter-spacing:-.005em}
.tk .page-hero h1,.tk .calc-hero h1,.tk .xt-hero h1{font-family:var(--black);font-weight:900;text-transform:uppercase;letter-spacing:-.01em;line-height:1.1;color:#fff}
.tk .calc-hero h1,.tk .xt-hero h1{font-size:clamp(1.85rem,4.3vw,3.25rem)}
.tk .tl-year,.tk .about-facts .f .n,.tk .about-badge .n,.tk .value .vn,.tk .hero-stats .st .n,.tk .proc-step .pn,.tk .price-row .pv,.tk .book-price .now,.tk .course-foot .cp,.tk .svc .num{font-family:var(--cond);font-weight:600;letter-spacing:0}
.tk .btn{font-family:var(--cond);font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.tk .site-header{padding:0;background:rgba(10,10,10,.72);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.tk .site-header.scrolled{padding:0;background:rgba(10,10,10,.96)}
.tk .header-inner{height:76px;gap:20px}
.tk .brand{gap:12px}
.tk .brand-mark{width:42px;height:42px;border-radius:12px;font-size:1.25rem}
.tk .brand-text{line-height:1.15}
.tk .brand-text .name{font-family:var(--cond);font-weight:600;font-size:1.15rem;letter-spacing:.04em;white-space:nowrap}
.tk .brand-text .sub{font-size:.7rem;letter-spacing:.18em;margin-top:2px;white-space:nowrap}
.tk .main-nav{gap:18px}
.tk .main-nav a{font-family:var(--cond);font-size:.95rem;letter-spacing:.05em;text-transform:uppercase;font-weight:500}
.tk .main-nav a.on{color:var(--gold)}
.tk .main-nav a:not(.btn)::after{bottom:0;height:2px}
.tk .main-nav a.on:not(.btn)::after{width:100%}
.tk .header-phone{font-family:var(--cond);font-size:1rem;letter-spacing:.05em;white-space:nowrap}
.tk .header-cta .btn{padding:11px 24px;font-size:.86rem;white-space:nowrap}
.tk .nav-drop>a{text-transform:uppercase}
.tk .nav-drop .dd a{text-transform:none;font-family:var(--sans);letter-spacing:.02em}
@media(max-width:1180px){.tk .main-nav{gap:13px}
.tk .main-nav a{font-size:.88rem}
.tk .header-phone{display:none}}
.tk .calc-out{position:relative}
.tk .calc-out.khoa > *:not(.cong-lead){filter:blur(7px);pointer-events:none;user-select:none;opacity:.5}
.tk .cong-lead{display:none;position:absolute;inset:0;z-index:20;background:linear-gradient(160deg,rgba(18,20,24,.97),rgba(12,14,17,.99));border-radius:0;padding:34px;overflow-y:auto}
.tk .calc-out.khoa .cong-lead{display:flex;align-items:center;justify-content:center}
.tk .cl-in{max-width:420px;width:100%;text-align:center}
.tk .cl-ic{font-size:2rem;margin-bottom:14px;filter:grayscale(.2)}
.tk .cl-in h3{font-family:var(--cond);font-size:clamp(1.3rem,2.6vw,1.75rem);color:#fff;line-height:1.35;margin:0 0 14px}
.tk .cl-in > p{font-size:.95rem;line-height:1.95;color:#D2D2D2;margin:0 0 22px}
.tk .cl-in > p b{color:var(--gold-soft);font-weight:600}
.tk .cl-in input{width:100%;padding:14px 16px;margin-bottom:11px;background:#0c0e11;border:1px solid rgba(255,255,255,.16);border-radius:4px;color:#fff;font-family:inherit;font-size:.97rem;box-sizing:border-box}
.tk .cl-in input::placeholder{color:#8a8a8a}
.tk .cl-in input:focus{outline:none;border-color:var(--gold)}
.tk .cl-in .btn{margin-top:6px}
.tk .cl-err{min-height:20px;margin-top:9px;font-size:.87rem;color:#ff8585;line-height:1.6}
.tk .cl-note{font-size:.83rem;line-height:1.8;color:#8f8f8f;margin:18px 0 0}
@media(max-width:960px){.tk .cong-lead{position:relative;inset:auto;padding:28px 22px;border:1px solid var(--line-gold);border-radius:5px;margin-bottom:22px}
.tk .calc-out.khoa > *:not(.cong-lead){display:none}}
.tk .contact-form input[type=text],.tk .contact-form input[type=tel],.tk .contact-form input[type=email],.tk .contact-form input[type=number],.tk .contact-form select,.tk .contact-form textarea{width:100%;padding:15px 17px;background:#0c0e11;
  border:1px solid rgba(255,255,255,.14);border-radius:4px;
  color:#fff;font-family:inherit;font-size:.99rem;font-weight:500;
  transition:border-color .25s}
.tk .contact-form input::placeholder,.tk .contact-form textarea::placeholder{color:#8d8d8d}
.tk .contact-form input:focus,.tk .contact-form select:focus,.tk .contact-form textarea:focus{outline:none;border-color:var(--gold)}
.tk .contact-form select option{background:#0c0e11;color:#fff}
.tk .contact-form .form-row{grid-template-columns:1fr;margin-bottom:14px}
.tk .contact-form .form-row.doi{grid-template-columns:1fr 1fr;gap:14px}
.tk .contact-form .form-note{margin-top:12px;font-size:.86rem;line-height:1.7}
.tk .contact-form .btn{margin-top:4px}
.tk .nav-drop{position:relative;display:inline-flex;align-items:center}
.tk .nav-drop>a::before{content:"";position:absolute;left:0;right:0;top:100%;height:18px}
.tk .main-nav .nav-drop>a::after,.tk .main-nav .nav-drop>a.on::after,.tk .main-nav .nav-drop>a:hover::after{content:"";position:static;display:inline-block;
  width:5px;height:5px;margin-left:8px;
  background:none;border:0;
  border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;
  transform:rotate(45deg) translateY(-2px);opacity:.75;transition:none}
.tk .nav-drop .dd{position:absolute;top:calc(100% + 16px);left:50%;transform:translateX(-50%) translateY(-8px);min-width:226px;background:#111316;border:1px solid var(--line-gold);border-radius:5px;padding:9px;opacity:0;visibility:hidden;transition:all .26s var(--ease);box-shadow:0 18px 44px rgba(0,0,0,.55);z-index:60}
.tk .nav-drop:hover .dd,.tk .nav-drop:focus-within .dd{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.tk .nav-drop .dd a{display:block;padding:11px 14px;border-radius:4px;font-size:.86rem;white-space:nowrap;color:#DEDEDE;transition:all .2s}
.tk .nav-drop .dd a:hover{background:rgba(255,174,15,.12);color:var(--gold)}
.tk .nav-drop .dd a::after{display:none}
@media(max-width:820px){.tk .nav-drop .dd{position:static;transform:none;opacity:1;visibility:visible;border:none;box-shadow:none;background:none;padding:0 0 0 14px;min-width:0}
.tk .nav-drop>a::after{display:none}}
.tk .btn{border-radius:999px}
.tk .btn-gold{background:linear-gradient(100deg,var(--gold) 0%,#F9D45D 100%);color:#1a1300;box-shadow:0 10px 34px rgba(255,174,15,.28)}
.tk .btn-gold:hover{box-shadow:0 16px 44px rgba(255,174,15,.42)}
.tk .card,.tk .book-card,.tk .course-card,.tk .testi-card,.tk .value,.tk .blog-featured,.tk .author-box,.tk .toc,.tk .contact-form,.tk .map-embed,.tk .proc-grid,.tk .price-table,.tk .proj,.tk .calc-shell,.tk .xt-shell,.tk .rl-card,.tk .fg-card{border-radius:20px}
.tk .card,.tk .book-card,.tk .course-card,.tk .blog-featured,.tk .proj,.tk .map-embed,.tk .price-table,.tk .proc-grid,.tk .calc-shell,.tk .xt-shell{overflow:hidden}
.tk .about-hero-img img,.tk .about-visual img{border-radius:20px}
.tk .article-body img{border-radius:14px}
.tk .about-badge,.tk .article-body .callout,.tk .verdict,.tk .cm-box,.tk .adv,.tk .qd-box,.tk .disclaim,.tk .ruler-info,.tk .note-x,.tk .muon-tuoi,.tk .deliver,.tk .cost-box{border-radius:16px}
.tk .card-tag,.tk .course-img .lvl,.tk .course-img .badge-soon{border-radius:999px}
.tk .field input,.tk .field select,.tk .field textarea,.tk .contact-form input[type=text],.tk .contact-form input[type=tel],.tk .contact-form input[type=email],.tk .contact-form input[type=number],.tk .contact-form select,.tk .contact-form textarea,.tk .calc-in input[type=number],.tk .calc-in select,.tk .xf input,.tk .xf select,.tk #leadForm input,.tk .cl-in input{border-radius:12px}
.tk .outbar button{border-radius:999px}
.tk .lead-msg{display:none;margin-top:14px;padding:14px 16px;border-radius:12px;border:1px solid rgba(255,174,15,.45);background:rgba(255,174,15,.1);font-size:.93rem;line-height:1.75;color:inherit;text-align:left}
.tk .lead-msg.loi{border-color:rgba(255,107,107,.65);background:rgba(255,107,107,.1)}
.tk .lead-msg a:not(.btn){color:var(--gold);font-weight:600}
.tk .lead-msg .lead-zalo{display:flex;justify-content:center;width:100%;margin-top:12px}
.tk .tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.tk .tool-card{display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:transform .3s,border-color .3s}
.tk .tool-card:hover{transform:translateY(-4px);border-color:var(--gold)}
.tk .tool-card p{flex:1}
.tk .tool-card .tc-go{margin-top:16px;font-family:var(--cond);font-weight:600;letter-spacing:.06em;text-transform:uppercase;font-size:.86rem;color:var(--gold)}
@media(max-width:1024px){.tk .tool-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.tk .tool-grid{grid-template-columns:1fr}}
.tk .section-head h2,.tk .head-gold{font-size:clamp(1.8rem,3.6vw,2.9rem);letter-spacing:.01em}
.tk .site-header,.tk .site-header.scrolled{backdrop-filter:none;-webkit-backdrop-filter:none}
.tk .site-header::before{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px)}
@media(max-width:880px){.tk .header-cta .btn,.tk .header-phone{display:none}}
@media(min-width:881px) and (max-width:1024px){.tk .main-nav{gap:10px}
.tk .main-nav a{font-size:.84rem;letter-spacing:.03em}
.tk .header-cta .btn{padding:10px 18px}}
.tk .bk-hero{padding:130px 0 70px;position:relative;overflow:hidden}
.tk .bk-hero .wrap{display:grid;grid-template-columns:1fr 1.15fr;gap:60px;align-items:center}
.tk .bk-cover{display:flex;justify-content:center}
.tk .bk-cover .book-cover{width:100%;max-width:360px;aspect-ratio:3/4;border-radius:20px}
.tk .bk-hero h1{margin:16px 0 18px}
.tk .bk-hero .lead{color:var(--ink-soft);font-size:1.06rem;line-height:1.95;margin:0 0 24px}
.tk .bk-price{display:flex;align-items:baseline;gap:14px;margin:0 0 22px;flex-wrap:wrap}
.tk .bk-price .now{font-family:var(--cond);font-weight:600;font-size:2.4rem;color:#fff;line-height:1}
.tk .bk-price .now.free{color:var(--gold)}
.tk .bk-price .old{font-size:1.05rem;color:#8d8d8d;text-decoration:line-through}
.tk .bk-price .tag{font-family:var(--cond);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;background:rgba(255,174,15,.14);color:var(--gold);border:1px solid rgba(255,174,15,.4);padding:5px 12px;border-radius:999px}
.tk .bk-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.tk .bk-chips span{font-size:.84rem;padding:8px 14px;border:1px solid var(--line-gold);border-radius:999px;color:var(--gold-soft)}
.tk .bk-cta{display:flex;gap:12px;flex-wrap:wrap}
.tk .bk-pain{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.tk .bk-pain li{padding:18px 22px 18px 54px;position:relative;border:1px solid rgba(255,255,255,.08);border-radius:16px;background:rgba(255,255,255,.02);color:var(--ink-soft);line-height:1.8}
.tk .bk-pain li::before{content:"✕";position:absolute;left:20px;top:17px;color:#f0937f;font-weight:700}
.tk .bk-ba{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.tk .bk-ba .col{border-radius:20px;padding:28px;border:1px solid rgba(255,255,255,.1)}
.tk .bk-ba .col.truoc{background:rgba(214,90,70,.05);border-color:rgba(214,90,70,.35)}
.tk .bk-ba .col.sau{background:rgba(255,174,15,.05);border-color:rgba(255,174,15,.4)}
.tk .bk-ba h3{font-family:var(--cond);font-size:1.2rem;margin:0 0 14px;text-transform:uppercase;letter-spacing:.04em}
.tk .bk-ba .truoc h3{color:#f0937f}
.tk .bk-ba .sau h3{color:var(--gold)}
.tk .bk-ba ul{margin:0;padding-left:20px;color:var(--ink-soft);line-height:1.9}
.tk .bk-toc{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.tk .bk-toc .it{display:flex;gap:16px;padding:18px 20px;border:1px solid rgba(255,255,255,.08);border-radius:16px;background:rgba(255,255,255,.02)}
.tk .bk-toc .it .so{flex:0 0 auto;font-family:var(--cond);font-weight:600;font-size:1.3rem;color:var(--gold);min-width:34px}
.tk .bk-toc .it b{display:block;color:#fff;font-weight:600;margin-bottom:4px;line-height:1.5}
.tk .bk-toc .it span{color:var(--ink-soft);font-size:.92rem;line-height:1.7}
.tk .bk-giaidoan{margin:28px 0 12px;font-family:var(--cond);font-size:1.05rem;letter-spacing:.06em;text-transform:uppercase;color:var(--gold-soft)}
.tk .bk-author{display:grid;grid-template-columns:260px 1fr;gap:40px;align-items:center}
.tk .bk-author img{width:100%;height:auto;aspect-ratio:3/4;object-fit:cover;object-position:center top;border-radius:20px}
.tk .bk-author p{color:var(--ink-soft);line-height:1.95}
.tk .bk-order{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.tk .bk-sum{border:1px solid var(--line-gold);border-radius:20px;padding:28px;background:rgba(255,174,15,.04)}
.tk .bk-sum h3{font-family:var(--cond);font-size:1.3rem;color:#fff;margin:0 0 14px}
.tk .bk-sum ul{list-style:none;padding:0;margin:0 0 18px}
.tk .bk-sum li{padding:10px 0;border-bottom:1px solid rgba(255,255,255,.07);color:var(--ink-soft);display:flex;justify-content:space-between;gap:12px}
.tk .bk-sum li b{color:#fff;font-weight:600}
.tk .bk-sum .tong{font-family:var(--cond);font-size:1.9rem;color:var(--gold);font-weight:600}
.tk .bk-form{border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:28px;background:linear-gradient(160deg,#16181c,#0d0f12)}
.tk .bk-form label.l{display:block;font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-soft);margin:0 0 8px;font-weight:600}
.tk .bk-form .row{margin-bottom:16px}
.tk .bk-form input[type=text],.tk .bk-form input[type=tel],.tk .bk-form input[type=email],.tk .bk-form textarea{width:100%;padding:14px 16px;background:#0c0e11;border:1px solid rgba(255,255,255,.14);border-radius:12px;color:#fff;font-family:inherit;font-size:.98rem;box-sizing:border-box}
.tk .bk-form textarea{min-height:84px;resize:vertical}
.tk .bk-form input:focus,.tk .bk-form textarea:focus{outline:none;border-color:var(--gold)}
.tk .bk-form input::placeholder,.tk .bk-form textarea::placeholder{color:#8a8a8a}
.tk .bk-opt{display:flex;gap:10px;flex-wrap:wrap}
.tk .bk-opt label{position:relative}
.tk .bk-opt input{position:absolute;opacity:0}
.tk .bk-opt span{display:block;padding:11px 18px;border:1px solid rgba(255,255,255,.16);border-radius:999px;cursor:pointer;color:var(--ink-soft);font-size:.93rem}
.tk .bk-opt input:checked+span{border-color:var(--gold);background:rgba(255,174,15,.14);color:var(--gold-soft)}
.tk .bk-note{font-size:.86rem;color:#9a9a9a;line-height:1.7;margin-top:12px}
.tk .tt-wrap{max-width:880px;margin:0 auto}
.tk .tt-box{border:1px solid var(--line-gold);border-radius:20px;padding:30px;background:linear-gradient(160deg,#16181c,#0d0f12);margin-bottom:20px}
.tk .tt-grid{display:grid;grid-template-columns:260px 1fr;gap:30px;align-items:start}
.tk .tt-qr{background:#fff;border-radius:16px;padding:12px;text-align:center}
.tk .tt-qr img{width:100%;height:auto;display:block}
.tk .tt-row{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08);color:var(--ink-soft)}
.tk .tt-row b{color:#fff;font-weight:600;word-break:break-all}
.tk .tt-copy{padding:6px 12px;border-radius:999px;border:1px solid var(--gold);background:none;color:var(--gold);font-family:var(--cond);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;cursor:pointer;flex:0 0 auto}
.tk .tt-copy:hover{background:var(--gold);color:#1a1300}
@media(max-width:960px){.tk .bk-hero .wrap,.tk .bk-order,.tk .bk-author,.tk .tt-grid{grid-template-columns:1fr}
.tk .bk-hero{padding:110px 0 50px}
.tk .bk-cover .book-cover{max-width:260px}
.tk .bk-ba,.tk .bk-toc{grid-template-columns:1fr}
.tk .bk-author img{max-width:260px}}
.tk .kh-tabs-wrap{position:sticky;top:76px;z-index:40;background:rgba(10,10,10,.92);border-bottom:1px solid var(--line);padding:14px 0}
.tk .kh-tabs{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}
.tk .kh-tab{padding:12px 26px;border-radius:999px;border:1px solid rgba(255,255,255,.18);background:none;color:#dcdcdc;font-family:var(--cond);font-size:1rem;letter-spacing:.06em;text-transform:uppercase;cursor:pointer;transition:all .2s}
.tk .kh-tab:hover{border-color:var(--gold);color:var(--gold)}
.tk .kh-tab.on{background:linear-gradient(100deg,var(--gold),#F9D45D);color:#1a1300;border-color:transparent;font-weight:600}
.tk .cn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tk .cn-card{display:flex;flex-direction:column}
.tk .cn-card h3{margin:12px 0 10px}
.tk .cn-card p{flex:0 0 auto}
.tk .cn-card ul{margin:12px 0 18px;padding-left:20px;color:var(--ink-soft);line-height:1.85;font-size:.94rem;flex:1}
.tk .cn-tag{align-self:flex-start;font-family:var(--cond);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;padding:5px 12px;border-radius:999px;background:rgba(255,174,15,.12);color:var(--gold);border:1px solid rgba(255,174,15,.35)}
.tk .cn-foot{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding-top:14px;border-top:1px solid rgba(255,255,255,.08)}
.tk .cn-gia{font-family:var(--cond);font-weight:600;font-size:1.15rem;color:var(--gold)}
.tk .cn-form-wrap{display:grid;grid-template-columns:1fr 1.1fr;gap:40px;align-items:center;margin-top:60px}
.tk .cn-select{width:100%;padding:14px 16px;background:#0c0e11;border:1px solid rgba(255,255,255,.14);border-radius:12px;color:#fff;font-family:inherit;font-size:.98rem}
@media(max-width:1024px){.tk .cn-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.tk .kh-tabs-wrap{top:70px}}
@media(max-width:640px){.tk .cn-grid,.tk .cn-form-wrap{grid-template-columns:1fr}
.tk .kh-tab{padding:10px 18px;font-size:.9rem}}
.tk .sp-mock{width:100%;max-width:420px;border:1px solid var(--line-gold);border-radius:24px;padding:24px;background:linear-gradient(160deg,#16181c,#0b0c0f);box-shadow:0 30px 70px rgba(0,0,0,.45)}
.tk .sp-mock .top{display:flex;align-items:center;gap:12px;padding-bottom:14px;margin-bottom:16px;border-bottom:1px solid rgba(255,255,255,.08);font-family:var(--cond);color:#fff;letter-spacing:.04em;font-size:1.05rem}
.tk .sp-mock .dot{width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--gold),#F9D45D);color:#1a1300;display:grid;place-items:center;font-weight:700;flex:0 0 auto}
.tk .sp-bb{padding:12px 16px;border-radius:16px;margin:0 0 10px;line-height:1.65;font-size:.93rem;max-width:90%}
.tk .sp-bb small{display:block;font-size:.7rem;color:#8d8d8d;margin-bottom:3px;letter-spacing:.06em;text-transform:uppercase}
.tk .sp-bb.me{margin-left:auto;background:rgba(255,174,15,.13);border:1px solid rgba(255,174,15,.35);color:#f3e2b8;border-bottom-right-radius:4px}
.tk .sp-bb.bot{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);color:#ddd;border-bottom-left-radius:4px}
.tk .cn-card h3 a{color:inherit;text-decoration:none}
.tk .cn-card h3 a:hover{color:var(--gold)}
.tk .sp-goi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch;margin-top:10px}
.tk .sp-goi-grid.mot{grid-template-columns:1fr;max-width:620px;margin:0 auto}
.tk .sp-goi{position:relative;display:flex;flex-direction:column;border:1px solid rgba(255,255,255,.1);border-radius:22px;padding:32px 26px 26px;background:rgba(255,255,255,.02)}
.tk .sp-goi.noi{border-color:var(--gold);background:linear-gradient(170deg,rgba(255,174,15,.10),rgba(255,174,15,.02));box-shadow:0 20px 50px rgba(255,174,15,.10)}
.tk .sp-goi .nhan{position:absolute;top:-13px;left:50%;transform:translateX(-50%);white-space:nowrap;background:linear-gradient(100deg,var(--gold),#F9D45D);color:#1a1300;font-family:var(--cond);font-size:.76rem;letter-spacing:.08em;text-transform:uppercase;padding:5px 14px;border-radius:999px;font-weight:600}
.tk .sp-goi h3{font-family:var(--cond);font-size:1.35rem;color:#fff;margin:0 0 8px;text-transform:uppercase;letter-spacing:.04em}
.tk .sp-goi .cho{color:var(--ink-soft);font-size:.92rem;line-height:1.7;margin:0 0 18px}
.tk .sp-goi .gia{font-family:var(--cond);font-weight:600;font-size:2rem;color:var(--gold);line-height:1.1;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.tk .sp-goi .gia .cu{font-family:inherit;font-size:1rem;color:#8d8d8d;text-decoration:line-through;font-weight:400}
.tk .sp-goi .phu{font-size:.85rem;color:#9a9a9a;margin:8px 0 18px}
.tk .sp-goi ul{list-style:none;padding:0;margin:0 0 24px;flex:1}
.tk .sp-goi li{position:relative;padding:8px 0 8px 26px;color:var(--ink-soft);font-size:.93rem;line-height:1.6;border-bottom:1px dashed rgba(255,255,255,.07)}
.tk .sp-goi li::before{content:"✓";position:absolute;left:2px;top:8px;color:var(--gold);font-weight:700}
.tk .sp-goi li.khong{color:#7d7d7d}
.tk .sp-goi li.khong::before{content:"–";color:#666}
.tk .sp-goi .btn{justify-content:center;width:100%;box-sizing:border-box}
.tk .sp-bang-wrap{margin-top:40px;overflow-x:auto;border:1px solid rgba(255,255,255,.08);border-radius:18px}
.tk .sp-bang{width:100%;border-collapse:collapse;min-width:560px;font-size:.93rem}
.tk .sp-bang th,.tk .sp-bang td{padding:13px 16px;border-bottom:1px solid rgba(255,255,255,.07);text-align:center;color:var(--ink-soft)}
.tk .sp-bang th:first-child{text-align:left;color:#ddd;font-weight:500}
.tk .sp-bang thead th{font-family:var(--cond);text-transform:uppercase;letter-spacing:.05em;color:#fff;background:rgba(255,255,255,.03)}
.tk .sp-bang .noi{background:rgba(255,174,15,.07);color:var(--gold-soft)}
.tk .sp-bang tr.gia td{font-family:var(--cond);font-size:1.15rem;color:var(--gold);font-weight:600}
.tk .sp-bang tbody tr:last-child th,.tk .sp-bang tbody tr:last-child td{border-bottom:0}
.tk .sp-buoc{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.tk .sp-buoc-it{border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:24px;background:rgba(255,255,255,.02)}
.tk .sp-buoc-it .n{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--gold);color:var(--gold);font-family:var(--cond);font-weight:600;font-size:1.1rem;margin-bottom:14px}
.tk .sp-buoc-it b{display:block;color:#fff;font-size:1.05rem;margin-bottom:6px}
.tk .sp-buoc-it p{margin:0;color:var(--ink-soft);font-size:.92rem;line-height:1.7}
.tk .sp-gh{list-style:none;padding:0;margin:0;display:grid;gap:14px}
.tk .sp-gh li{position:relative;padding:18px 22px 18px 58px;border:1px solid rgba(255,174,15,.25);border-radius:16px;background:rgba(255,174,15,.04);color:var(--ink-soft);line-height:1.8}
.tk .sp-gh li::before{content:"!";position:absolute;left:18px;top:17px;width:26px;height:26px;border-radius:50%;background:rgba(255,174,15,.18);color:var(--gold);font-weight:700;display:grid;place-items:center;font-size:.9rem}
.tk .sp-faq{border:1px solid rgba(255,255,255,.08);border-radius:16px;margin-bottom:12px;background:rgba(255,255,255,.02)}
.tk .sp-faq summary{cursor:pointer;list-style:none;padding:18px 52px 18px 22px;color:#fff;font-weight:600;position:relative;line-height:1.6}
.tk .sp-faq summary::-webkit-details-marker{display:none}
.tk .sp-faq summary::after{content:"+";position:absolute;right:22px;top:14px;font-size:1.5rem;color:var(--gold);font-weight:400}
.tk .sp-faq[open] summary::after{content:"–"}
.tk .sp-faq p{margin:0;padding:0 22px 20px;color:var(--ink-soft);line-height:1.85}
.tk .sp-khac{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.tk .sp-khac-it{display:flex;flex-direction:column;gap:12px;padding:22px;border:1px solid rgba(255,255,255,.08);border-radius:18px;background:rgba(255,255,255,.02);text-decoration:none;transition:border-color .2s,transform .2s}
.tk .sp-khac-it:hover{border-color:var(--gold);transform:translateY(-3px)}
.tk .sp-khac-it b{color:#fff;line-height:1.5;font-weight:600;flex:1}
.tk .sp-khac-it .xem{color:var(--gold);font-size:.86rem}
@media(max-width:1100px){.tk .sp-khac{grid-template-columns:repeat(3,1fr)}}
@media(max-width:960px){.tk .sp-goi-grid{grid-template-columns:1fr;max-width:560px;margin-left:auto;margin-right:auto}
.tk .sp-goi.noi{order:-1}
.tk .sp-buoc{grid-template-columns:1fr 1fr}
.tk .sp-mock{max-width:360px}}
@media(max-width:560px){.tk .sp-buoc,.tk .sp-khac{grid-template-columns:1fr}
.tk .sp-goi{padding:30px 20px 22px}
.tk .sp-mock{padding:18px}}
.tk .sp-goi-grid.hai{grid-template-columns:repeat(2,1fr);max-width:880px;margin:10px auto 0}
@media(max-width:960px){.tk .sp-goi-grid.hai{grid-template-columns:1fr;max-width:560px}}
.tk .book-cover.co-anh,.tk .bcover.co-anh{padding:22px}
.tk .anh-bia-that{display:block;max-width:80%;max-height:100%;width:auto;height:auto;margin:auto;border-radius:4px 8px 8px 4px;box-shadow:-6px 12px 30px rgba(0,0,0,.6)}
.tk .bk-anh-bia{display:block;width:100%;max-width:380px;height:auto;margin:0 auto;border-radius:6px 12px 12px 6px;box-shadow:-10px 20px 50px rgba(0,0,0,.6)}
@media(max-width:960px){.tk .bk-anh-bia{max-width:280px}}
.tk .bk-flip{position:relative;width:100%;max-width:1100px;margin:0 auto;aspect-ratio:16/10;border-radius:18px;overflow:hidden;border:1px solid var(--line-gold);background:#0c0e11;box-shadow:0 30px 70px rgba(0,0,0,.45)}
.tk .bk-flip iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
@media(max-width:760px){.tk .bk-flip{aspect-ratio:3/4.2}}
.tk .bk-form-nhanh{display:grid;grid-template-columns:1fr 1fr auto;gap:10px;margin:6px 0 4px;max-width:620px}
.tk .bk-form-nhanh input{width:100%;box-sizing:border-box;padding:14px 16px;background:#0c0e11;border:1px solid rgba(255,174,15,.35);border-radius:12px;color:#fff;font-family:inherit;font-size:.98rem}
.tk .bk-form-nhanh input:focus{outline:none;border-color:var(--gold)}
.tk .bk-form-nhanh input::placeholder{color:#8a8a8a}
.tk .bk-form-nhanh .btn{white-space:nowrap;justify-content:center}
.tk .bk-form-nhanh .bk-dong-y,.tk .bk-form-nhanh .lead-msg{grid-column:1/-1}
.tk .bk-dong-y{font-size:.78rem;color:#8d8d8d;line-height:1.6;margin:4px 0 0}
.tk .bk-khoa{position:absolute;inset:0;display:grid;place-items:center;overflow:hidden}
.tk .bk-khoa-nen{position:absolute;inset:-20px;width:calc(100% + 40px);height:calc(100% + 40px);object-fit:cover;filter:blur(14px) brightness(.35);transform:scale(1.05)}
.tk .bk-khoa-hop{position:relative;z-index:1;width:min(560px,92%);text-align:center;padding:30px 26px;border:1px solid var(--line-gold);border-radius:20px;background:rgba(10,11,14,.82);backdrop-filter:blur(4px)}
.tk .bk-khoa-icon{font-size:2rem;margin-bottom:6px}
.tk .bk-khoa-hop h3{font-family:var(--cond);font-size:1.5rem;color:#fff;margin:0 0 8px;text-transform:uppercase;letter-spacing:.03em}
.tk .bk-khoa-hop p{color:var(--ink-soft);margin:0 0 16px;line-height:1.7}
.tk .bk-khoa-hop .bk-form-nhanh{margin:0 auto;text-align:left}
@media(max-width:960px){.tk .bk-hero.pheu .bk-cover{order:2}
.tk .bk-hero.pheu .bk-anh-bia{max-width:220px}}
@media(max-width:640px){.tk .bk-form-nhanh{grid-template-columns:1fr}
.tk .bk-flip:has(.bk-khoa){aspect-ratio:auto;min-height:520px}
.tk .bk-khoa-hop{padding:24px 18px}}
@media(max-width:640px){.tk .bk-hero.pheu{padding-top:96px}
.tk .bk-hero.pheu .crumbs{display:none}
.tk .bk-hero.pheu h1{margin:10px 0 12px}
.tk .bk-hero.pheu .lead{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:14px}
.tk .bk-hero.pheu .bk-price{margin-bottom:14px}}
.tk .ev-ts{display:grid;grid-template-columns:1fr 360px;gap:28px;align-items:center;max-width:1100px;margin:0 auto}
.tk .ev-ts img{width:100%;height:auto;border-radius:18px;border:1px solid rgba(255,255,255,.08)}
.tk .ev-vid video{width:100%;height:auto;border-radius:22px;border:1px solid var(--line-gold);background:#000}
.tk .ev-vid p{text-align:center;color:var(--ink-soft);font-size:.88rem;margin:10px 0 0}
@media(max-width:960px){.tk .ev-ts{grid-template-columns:1fr}
.tk .ev-vid{max-width:360px;margin:0 auto}}

/* ===== Nhận diện X8 cho vùng công cụ (ghi đè biến tinhkts) ===== */
.tk{
  --ink:#111111; --ink-2:#171717; --paper:#111111; --paper-2:#171717; --paper-3:#1f1f1f; --white:#171717;
  --gold:#c9a36b; --gold-deep:#b08d57; --gold-soft:#e2c79a; --clay:#c9a36b; --clay-deep:#b08d57; --clay-soft:#e2c79a;
  --sage:#c9a36b; --brass:#c9a36b; --cream:#f3e6cf;
  --gold-grad:linear-gradient(135deg,#e8d2a6 0%,#c9a36b 48%,#a07c45 100%);
  --line-gold:rgba(201,163,107,.36);
  --serif:"Cormorant Garamond",Georgia,serif; --sans:"Montserrat",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --cond:"Montserrat",sans-serif; --black:"Cormorant Garamond",Georgia,serif;
  background:var(--paper); color:var(--text);
}
.tk h1,.tk h2{font-weight:500;letter-spacing:0}
.tk .reveal{opacity:1;transform:none}