:root{
  --ink:#1a1815;        /* gần đen, ấm */
  --paper:#faf7f0;      /* kem giấy */
  --paper-2:#f2ece0;
  --gold:#e0a92e;       /* vàng Đức, đã tiết chế */
  --gold-deep:#c98a10;
  --red:#b5322c;        /* đỏ trầm */
  --red-deep:#8f2420;
  --line:#e2d9c8;
  --muted:#6b6357;
  --white:#ffffff;
  --shadow:0 10px 40px rgba(26,24,21,.10);
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:'Fraunces',Georgia,serif;line-height:1.1;letter-spacing:-.01em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:15px;padding:13px 26px;border-radius:999px;border:2px solid transparent;cursor:pointer;transition:.2s;font-family:'Inter',sans-serif}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-deep);transform:translateY(-2px)}
.btn-gold{background:var(--gold);color:var(--ink)}
.btn-gold:hover{background:var(--gold-deep);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--paper)}
.eyebrow{font-size:13px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--red)}

/* ===== TOP BAR ===== */
.topbar{background:var(--ink);color:var(--paper);font-size:13.5px}
.topbar .wrap{display:flex;justify-content:space-between;align-items:center;height:40px;flex-wrap:wrap}
.topbar a{opacity:.9}
.topbar a:hover{opacity:1;color:var(--gold)}
.topbar .tb-right{display:flex;gap:20px;align-items:center}

/* ===== HEADER / NAV ===== */
header{position:sticky;top:0;z-index:100;background:rgba(250,247,240,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.logo{display:flex;align-items:center;gap:11px;flex:none}
.logo-img{height:46px;width:auto;display:block}
@media(max-width:480px){.logo-img{height:38px}}
.logo .mark{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,var(--ink) 33%,var(--red) 33% 66%,var(--gold) 66%);flex:none;box-shadow:0 3px 10px rgba(26,24,21,.15)}
.logo .lt{display:flex;flex-direction:column;line-height:1}
.logo .lt b{font-family:'Fraunces';font-weight:900;font-size:20px;letter-spacing:-.01em;white-space:nowrap}
.logo .lt small{font-family:'Inter';font-weight:600;font-size:9.5px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;margin-top:3px;white-space:nowrap}
.menu{display:flex;gap:2px;align-items:center;flex:1;justify-content:center}
.menu>li{list-style:none;position:relative}
.menu>li>a{display:flex;align-items:center;gap:5px;padding:10px 14px;font-weight:600;font-size:14.5px;border-radius:8px;white-space:nowrap;color:var(--ink)}
.menu>li>a:hover{background:var(--paper-2);color:var(--red)}
.caret{width:7px;height:7px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);margin-top:-3px;transition:.2s}
.menu>li:hover .caret{transform:rotate(-135deg);margin-top:2px}
/* mega dropdown */
.mega{position:absolute;top:calc(100% + 8px);left:50%;transform:translateX(-50%) translateY(8px);width:440px;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;opacity:0;visibility:hidden;transition:.22s;display:grid;grid-template-columns:1fr 1fr;gap:8px 22px}
.menu>li:hover .mega{opacity:1;visibility:visible;transform:translateX(-50%) translateY(0)}
.mega h4{grid-column:auto;font-family:'Inter';font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--red);font-weight:700;padding-bottom:8px;margin-bottom:4px;border-bottom:2px solid var(--paper-2)}
.mega a{display:block;padding:7px 8px;font-size:14.5px;border-radius:7px;color:var(--ink)}
.mega a:hover{background:var(--paper);color:var(--red);padding-left:14px}
.nav-cta{display:flex;gap:10px;align-items:center;flex:none}
.nav-cta .btn{padding:11px 20px;font-size:14.5px}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.hamburger span{width:26px;height:2.5px;background:var(--ink);border-radius:2px;transition:.2s}

/* ===== HERO ===== */
.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,var(--paper),var(--paper-2))}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:50px;align-items:center;padding-top:64px;padding-bottom:64px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:var(--white);border:1px solid var(--line);padding:7px 15px;border-radius:999px;font-size:13.5px;font-weight:600;margin-bottom:22px}
.dot{width:8px;height:8px;border-radius:50%;background:#22a06b;box-shadow:0 0 0 4px rgba(34,160,107,.18)}
.hero h1{font-size:clamp(38px,5.2vw,62px);font-weight:900;margin-bottom:20px}
.hero h1 .hl{color:var(--red);position:relative}
.hero h1 .hl::after{content:"";position:absolute;left:0;right:0;bottom:6px;height:12px;background:var(--gold);opacity:.35;z-index:-1}
.hero p.lead{font-size:18.5px;color:var(--muted);max-width:520px;margin-bottom:30px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:8px}
/* hero visual */
.hero-visual{position:relative}
.demo-frame{background:var(--ink);border-radius:18px;padding:12px;box-shadow:var(--shadow);position:relative}
.demo-frame .screen{border-radius:10px;overflow:hidden;background:#000;aspect-ratio:16/10;position:relative;display:flex;align-items:center;justify-content:center}
.demo-frame .screen video{width:100%;height:100%;object-fit:cover}
.demo-poster{position:absolute;inset:0;background:linear-gradient(135deg,#2a2620,#4a3f30);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;color:var(--paper);text-align:center;padding:20px}
.play-btn{width:74px;height:74px;border-radius:50%;background:var(--gold);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:.2s;box-shadow:0 8px 30px rgba(224,169,46,.5)}
.play-btn:hover{transform:scale(1.08)}
.play-btn::before{content:"";border-left:20px solid var(--ink);border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:5px}
.demo-frame .tag{position:absolute;top:-14px;right:22px;background:var(--red);color:#fff;font-size:12.5px;font-weight:700;padding:6px 14px;border-radius:999px;box-shadow:var(--shadow)}
.float-card{position:absolute;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);display:flex;align-items:center;gap:11px;font-size:13.5px;font-weight:600}
.float-card .ic{width:36px;height:36px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:18px}
.fc-1{bottom:-22px;left:-26px}
.fc-2{top:24px;right:-30px}

/* ===== LOGO STRIP ===== */
.trust{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--white)}
.trust .wrap{display:flex;align-items:center;gap:38px;padding:20px 24px;flex-wrap:wrap;justify-content:center}
.trust span{font-weight:600;color:var(--muted);font-size:14.5px;display:flex;align-items:center;gap:9px}

/* ===== SECTION SHELL ===== */
section{padding:78px 0}
.sec-head{text-align:center;max-width:660px;margin:0 auto 48px}
.sec-head h2{font-size:clamp(30px,4vw,44px);font-weight:900;margin:12px 0 14px}
.sec-head p{font-size:17px;color:var(--muted)}

/* ===== DEMO / HỌC THỬ ===== */
.demo-sec{background:var(--paper-2)}
.demo-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.vcard{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.22s;cursor:pointer}
.vcard:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.vthumb{position:relative;aspect-ratio:16/9;background:linear-gradient(135deg,#3a332a,#1a1815);display:flex;align-items:center;justify-content:center}
.vthumb .lvl{position:absolute;top:12px;left:12px;background:var(--gold);color:var(--ink);font-weight:700;font-size:12px;padding:4px 11px;border-radius:6px}
.vthumb .free{position:absolute;top:12px;right:12px;background:#22a06b;color:#fff;font-weight:700;font-size:12px;padding:4px 11px;border-radius:6px}
.vthumb .mini-play{width:54px;height:54px;border-radius:50%;background:rgba(255,255,255,.92);display:flex;align-items:center;justify-content:center}
.vthumb .mini-play::before{content:"";border-left:15px solid var(--red);border-top:9px solid transparent;border-bottom:9px solid transparent;margin-left:4px}
.vcard .vbody{padding:16px 18px}
.vcard .vbody h3{font-size:18px;font-family:'Inter';font-weight:700;margin-bottom:5px}
.vcard .vbody p{font-size:14px;color:var(--muted);margin-bottom:10px}
.vmeta{display:flex;gap:14px;font-size:13px;color:var(--muted);font-weight:600}

/* ===== BẢNG HỌC PHÍ ===== */
.price-sec{background:var(--paper)}
.level-tabs{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:36px}
.level-tabs button{font-family:'Inter';font-weight:700;font-size:15px;padding:11px 24px;border-radius:999px;border:2px solid var(--line);background:var(--white);cursor:pointer;transition:.18s;color:var(--muted)}
.level-tabs button.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.level-tabs button:hover:not(.active){border-color:var(--ink);color:var(--ink)}
.price-table{max-width:920px;margin:0 auto;background:var(--white);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--line)}
.pt-head{display:grid;grid-template-columns:1.4fr 1fr 1fr;background:var(--ink);color:var(--paper);font-weight:700;font-size:13.5px}
.pt-head div{padding:18px 16px;text-align:center}
.pt-head div:first-child{text-align:left}
.pt-band{background:var(--paper-2);text-align:center;padding:13px;font-weight:700;font-size:14px;color:var(--ink);border-bottom:1px solid var(--line)}
.pt-band small{display:block;font-weight:500;color:var(--muted);font-size:12.5px;margin-top:2px}
.pt-row{display:grid;grid-template-columns:1.4fr 1fr 1fr;border-bottom:1px solid var(--line);align-items:center}
.pt-row:last-child{border-bottom:none}
.pt-row div{padding:18px 16px;text-align:center;font-size:15px}
.pt-row div:first-child{text-align:left;font-weight:700}
.pt-row .orig{color:var(--muted);text-decoration:line-through;font-size:14px}
.pt-row .off{color:var(--red);font-weight:700}
.pt-row .on{color:var(--gold-deep);font-weight:800}
.pt-row .price-main{font-weight:800}
.price-note{text-align:center;color:var(--muted);font-size:14px;margin-top:20px}

/* ===== AFFILIATE ===== */
.aff{background:linear-gradient(160deg,#1a1815,#2c241a);color:var(--paper);position:relative;overflow:hidden}
.aff::before{content:"";position:absolute;top:-120px;right:-80px;width:340px;height:340px;border-radius:50%;background:radial-gradient(circle,rgba(224,169,46,.28),transparent 70%)}
.aff .wrap{position:relative}
.aff .sec-head h2{color:var(--paper)}
.aff .sec-head p{color:rgba(250,247,240,.72)}
.aff .sec-head .eyebrow{color:var(--gold)}
.aff-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;margin-top:20px}
.aff-steps{display:flex;flex-direction:column;gap:18px}
.aff-step{display:flex;gap:18px;align-items:flex-start;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.09);padding:20px 22px;border-radius:14px}
.aff-step .n{font-family:'Fraunces';font-weight:900;font-size:26px;color:var(--gold);flex:none;line-height:1}
.aff-step h3{font-family:'Inter';font-size:17px;font-weight:700;margin-bottom:4px}
.aff-step p{font-size:14.5px;color:rgba(250,247,240,.72)}
.aff-card{background:var(--white);color:var(--ink);border-radius:18px;padding:32px;box-shadow:var(--shadow)}
.aff-card h3{font-size:24px;font-weight:900;margin-bottom:6px}
.aff-card .commission{font-family:'Fraunces';font-weight:900;font-size:56px;color:var(--red);line-height:1;margin:14px 0 4px}
.aff-card .commission small{font-size:20px;color:var(--muted)}
.aff-benefits{list-style:none;margin:18px 0 22px}
.aff-benefits li{display:flex;gap:10px;align-items:flex-start;padding:8px 0;font-size:14.5px;border-bottom:1px dashed var(--line)}
.aff-benefits li::before{content:"✓";color:#22a06b;font-weight:900;flex:none}
.ref-box{display:flex;gap:8px;margin-top:14px}
.ref-box input{flex:1;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-family:'Inter';font-size:14px;background:var(--paper);color:var(--muted)}
.ref-box button{white-space:nowrap}

/* ===== FEATURES ===== */
.feat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.feat{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:.2s}
.feat:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.feat .ic{width:52px;height:52px;border-radius:13px;background:var(--paper-2);display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:16px}
.feat h3{font-family:'Inter';font-size:18px;font-weight:700;margin-bottom:8px}
.feat p{font-size:14.5px;color:var(--muted)}

/* ===== TESTIMONIAL ===== */
.testi-sec{background:var(--paper-2)}
.testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.testi{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.testi .stars{color:var(--gold);font-size:16px;letter-spacing:2px;margin-bottom:12px}
.testi p{font-size:15px;margin-bottom:18px}
.testi .who{display:flex;align-items:center;gap:12px}
.testi .who .av{width:44px;height:44px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-family:'Fraunces'}
.testi .who b{display:block;font-size:14.5px}
.testi .who span{font-size:13px;color:var(--muted)}

/* ===== CTA BAND ===== */
.cta-band{background:var(--red);color:#fff;text-align:center}
.cta-band h2{color:#fff;font-size:clamp(28px,4vw,42px);font-weight:900;margin-bottom:14px}
.cta-band p{font-size:18px;opacity:.92;margin-bottom:28px;max-width:560px;margin-left:auto;margin-right:auto}

/* ===== FOOTER ===== */
footer{background:var(--ink);color:rgba(250,247,240,.7);padding:60px 0 30px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px;margin-bottom:40px}
footer h4{color:var(--paper);font-family:'Inter';font-size:14px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;margin-bottom:16px}
footer ul{list-style:none}
footer ul li{margin-bottom:9px}
footer ul li a{font-size:14.5px}
footer ul li a:hover{color:var(--gold)}
footer .flogo{color:var(--paper);font-family:'Fraunces';font-weight:900;font-size:22px;margin-bottom:12px;display:flex;gap:10px;align-items:center}
footer .flogo .mark{width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,#faf7f0 33%,var(--red) 33% 66%,var(--gold) 66%)}
footer .fdesc{font-size:14.5px;max-width:300px;margin-bottom:16px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13.5px}

/* ===== MODAL ===== */
.modal{position:fixed;inset:0;background:rgba(20,18,15,.82);z-index:1000;display:none;align-items:center;justify-content:center;padding:24px}
.modal.open{display:flex}
.modal-box{background:#000;border-radius:16px;max-width:900px;width:100%;position:relative;box-shadow:var(--shadow)}
.modal-box video{width:100%;border-radius:16px;display:block}
.modal-close{position:absolute;top:-46px;right:0;background:var(--white);border:none;width:38px;height:38px;border-radius:50%;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.modal-poster{aspect-ratio:16/9;border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:linear-gradient(135deg,#2a2620,#4a3f30);color:var(--paper);text-align:center;padding:30px}

/* ===== FLOAT WIDGETS ===== */
.fab{position:fixed;right:20px;bottom:20px;z-index:90;display:flex;flex-direction:column;gap:12px}
.fab a{width:56px;height:56px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;box-shadow:var(--shadow);font-size:22px;transition:.2s}
.fab a:hover{transform:scale(1.08)}
.fab a.zalo{background:#0068ff;font-size:13px;font-weight:800}

/* ===== ROADMAP LỘ TRÌNH ===== */
.road-sec{background:var(--paper)}
.road{position:relative;max-width:960px;margin:0 auto;display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.road::before{content:"";position:absolute;top:34px;left:8%;right:8%;height:3px;background:linear-gradient(90deg,var(--gold),var(--red));border-radius:3px;z-index:0}
.rstep{position:relative;z-index:1;text-align:center}
.rstep .badge{width:70px;height:70px;border-radius:50%;background:var(--white);border:3px solid var(--gold);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 14px;font-family:'Fraunces';font-weight:900;font-size:20px;color:var(--ink);box-shadow:var(--shadow)}
.rstep:nth-child(n+3) .badge{border-color:var(--red)}
.rstep .badge span{font-size:9.5px;font-family:'Inter';font-weight:700;letter-spacing:.06em;color:var(--muted)}
.rstep h3{font-family:'Inter';font-size:15.5px;font-weight:700;margin-bottom:5px}
.rstep p{font-size:13px;color:var(--muted);line-height:1.5}

/* ===== FORM ĐĂNG KÝ ===== */
.form-sec{background:var(--paper-2)}
.form-wrap{max-width:960px;margin:0 auto;background:var(--white);border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);overflow:hidden;display:grid;grid-template-columns:.9fr 1.1fr}
.form-side{background:linear-gradient(160deg,var(--ink),#2c241a);color:var(--paper);padding:40px 34px;display:flex;flex-direction:column;justify-content:center}
.form-side h2{color:var(--paper);font-size:30px;font-weight:900;margin-bottom:14px}
.form-side p{color:rgba(250,247,240,.75);font-size:15px;margin-bottom:22px}
.form-side ul{list-style:none;display:flex;flex-direction:column;gap:12px}
.form-side ul li{display:flex;gap:10px;align-items:center;font-size:14.5px}
.form-side ul li::before{content:"✓";color:var(--gold);font-weight:900}
.form-body{padding:40px 34px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:6px}
.field input,.field select{width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:10px;font-family:'Inter';font-size:14.5px;background:var(--paper);transition:.15s}
.field input:focus,.field select:focus{outline:none;border-color:var(--red);background:#fff}
.form-body .btn{width:100%;justify-content:center;margin-top:6px}
.form-ok{display:none;text-align:center;padding:20px;background:#e9f7f0;border:1px solid #b7e4cd;border-radius:12px;color:#1a7a4f;font-weight:600;margin-top:14px}
.form-ok.show{display:block}

/* ===== FAQ ===== */
.faq-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq{background:var(--white);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.faq summary{padding:20px 22px;font-weight:700;font-size:16px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:24px;color:var(--red);font-weight:400;flex:none;transition:.2s}
.faq[open] summary::after{transform:rotate(45deg)}
.faq .fa-body{padding:0 22px 20px;color:var(--muted);font-size:15px}

/* ===== RESPONSIVE ===== */
@media(max-width:1080px){
  .nav{gap:14px}
  .menu>li>a{padding:10px 10px;font-size:14px}
  .nav-cta .btn-ghost{display:none}
  .nav-cta .btn{padding:11px 18px}
}
@media(max-width:960px){
  .hero .wrap{grid-template-columns:1fr;gap:40px}
  .hero-visual{max-width:520px;margin:0 auto}
  .demo-grid,.testi-grid{grid-template-columns:1fr 1fr}
  .feat-grid{grid-template-columns:1fr 1fr}
  .aff-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .form-wrap{grid-template-columns:1fr}
  .road{grid-template-columns:repeat(2,1fr);gap:28px 14px}
  .road::before{display:none}
}
@media(max-width:720px){
  .menu,.nav-cta .btn-ghost{display:none}
  .hamburger{display:flex}
  .menu.mobile-open{display:flex;flex-direction:column;position:absolute;top:74px;left:0;right:0;background:var(--white);padding:16px;gap:2px;box-shadow:var(--shadow);border-bottom:1px solid var(--line)}
  .menu.mobile-open>li>a{padding:14px}
  .mega{position:static;width:100%;transform:none;opacity:1;visibility:visible;box-shadow:none;border:none;grid-template-columns:1fr;padding:0 0 0 14px;display:none}
  .menu.mobile-open>li:hover .mega{display:grid}
  .demo-grid,.testi-grid,.feat-grid,.foot-grid{grid-template-columns:1fr}
  .pt-head,.pt-row{grid-template-columns:1fr .8fr .8fr;font-size:12px}
  .pt-head div,.pt-row div{padding:12px 8px;font-size:13px}
  .topbar .tb-left{display:none}
  .aff-card .commission{font-size:44px}
}