:root{--navy:#0B1F3A;--ocean:#0D6E8C;--teal:#55B8B2;--pearl:#F4F7F9;--silver:#B8C4CE;--gold:#C9A227;--ink:#1c2b3d;--mute:#4a5b6e;--line:#e1e8ee}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--ink);background:var(--pearl);line-height:1.7;font-size:17px}
a{color:inherit}
img,video,iframe{max-width:100%}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
section{padding:72px 0}
section.alt{background:#fff}
.center{text-align:center}
.center .sub{margin-left:auto;margin-right:auto}
h1,h2,h3{line-height:1.2;color:var(--navy);font-weight:700}
h1{font-size:clamp(30px,5.2vw,50px);font-weight:800}
h2{font-size:clamp(24px,3.6vw,35px);margin-bottom:12px}
h3{font-size:19px;margin-bottom:6px}
.kicker{display:inline-block;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--ocean);font-weight:600;margin-bottom:12px}
.sub{color:var(--mute);max-width:680px;margin-bottom:36px}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 28px;border-radius:12px;background:var(--ocean);color:#fff;font-weight:600;text-decoration:none;font-size:17px;transition:.2s;border:0;cursor:pointer;text-align:center;font-family:inherit}
.btn:hover{background:var(--navy);transform:translateY(-1px)}
.btn.ghost{background:transparent;border:1.5px solid var(--silver);color:var(--navy)}
.btn.ghost:hover{border-color:var(--navy);background:#fff}
.btn[disabled]{opacity:.6;cursor:wait;transform:none}
.note{font-size:14px;color:#5b6b7d;margin-top:14px}
.todo{background:#fff8e1;border:1px dashed var(--gold);border-radius:8px;padding:1px 8px;font-size:14px;color:#6b5a14}
/* nav */
nav{position:sticky;top:0;z-index:20;background:rgba(244,247,249,.93);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px;gap:12px}
nav b a{color:var(--navy);font-size:16px;text-decoration:none}
nav .links{display:flex;gap:20px;font-size:15px}
nav .links a{text-decoration:none;color:var(--mute)}
nav .links a:hover{color:var(--navy)}
nav a.btn{min-height:40px;padding:0 18px;font-size:15px}
/* hero */
.hero{background:var(--navy);color:#fff;padding:80px 0 72px;position:relative;overflow:hidden}
.hero:after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,var(--teal) 0%,transparent 70%);opacity:.26}
.hero .wrap{position:relative;z-index:1}
.hero h1{color:#fff;max-width:820px}
.hero p.lead{font-size:20px;max-width:640px;margin:20px 0 30px;color:#d6e2ea}
.hero .kicker{color:var(--teal)}
.hero .btn{background:var(--teal);color:var(--navy)}
.hero .btn:hover{background:#fff}
.hero .btn.ghost{background:transparent;color:#fff;border-color:#4b6683}
.hero .btn.ghost:hover{background:rgba(255,255,255,.08)}
.row{display:flex;flex-wrap:wrap;gap:14px}
.center .row{justify-content:center}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-top:44px}
.fact{border-top:2px solid var(--teal);padding-top:12px;font-size:15px;color:#cfdce6}
.fact b{display:block;color:#fff;font-size:17px;margin-bottom:2px}
/* grid + cards */
.grid{display:grid;gap:18px;align-items:stretch}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;display:flex;flex-direction:column}
section.alt .card{background:var(--pearl)}
.card p{color:var(--mute);font-size:16px}
.card .n{display:inline-flex;width:34px;height:34px;border-radius:50%;background:#fff;color:var(--ocean);align-items:center;justify-content:center;font-weight:700;margin-bottom:12px;border:1px solid var(--silver)}
.card ul{list-style:none;margin:8px 0 18px}
.card li{padding:5px 0 5px 26px;position:relative;font-size:16px;color:#34475b}
.card li:before{content:"";position:absolute;left:2px;top:14px;width:12px;height:7px;border-left:2px solid var(--teal);border-bottom:2px solid var(--teal);transform:rotate(-45deg)}
.card .push{margin-top:auto}
.card.hl{border:2px solid var(--ocean);position:relative}
.badge{position:absolute;top:-13px;left:20px;background:var(--gold);color:var(--navy);font-size:12px;font-weight:700;padding:3px 12px;border-radius:99px}
.pain .card{border-left:4px solid var(--ocean)}
/* audience */
.fit .card{border-top:4px solid var(--teal)}
.nofit{border:1px solid var(--line);border-left:5px solid #c0392b;background:#fff;border-radius:16px;padding:26px;margin-top:22px}
.nofit h3{color:#8a2a20;margin-bottom:10px}
.nofit ul{list-style:none;display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.nofit li{position:relative;padding-left:26px;font-size:16px;color:#34475b}
.nofit li:before,.nofit li:after{content:"";position:absolute;left:5px;top:12px;width:12px;height:2px;background:#c0392b;transform:rotate(45deg)}
.nofit li:after{transform:rotate(-45deg)}
/* content blocks */
.parts{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.part{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px}
.part .tag{display:inline-block;font-size:13px;font-weight:700;color:var(--ocean);text-transform:uppercase;letter-spacing:.06em;margin-bottom:8px}
.part ul{list-style:none;margin-top:10px}
.part li{padding:6px 0 6px 26px;position:relative;font-size:16px;color:#34475b}
.part li:before{content:"";position:absolute;left:2px;top:15px;width:12px;height:7px;border-left:2px solid var(--teal);border-bottom:2px solid var(--teal);transform:rotate(-45deg)}
/* video */
.video{position:relative;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:var(--navy);display:flex;align-items:center;justify-content:center;color:#cfdce6;border:1px solid var(--line)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video .ph{text-align:center;padding:20px}
.video .ph b{display:block;color:#fff;font-size:18px;margin-bottom:4px}
.video .play{width:64px;height:64px;border-radius:50%;background:rgba(85,184,178,.2);border:2px solid var(--teal);margin:0 auto 14px;position:relative}
.video .play:after{content:"";position:absolute;left:25px;top:19px;border-left:18px solid var(--teal);border-top:12px solid transparent;border-bottom:12px solid transparent}
.vcap{font-size:15px;color:#5b6b7d;margin-top:10px;text-align:center}
/* bonus */
.bn{display:grid;grid-template-columns:44px 1fr;gap:14px;align-items:start;padding:16px 0;border-bottom:1px solid #edf1f4}
.bn:last-child{border-bottom:0}
.bn .ic{width:44px;height:44px;border-radius:12px;background:var(--pearl);color:var(--ocean);display:flex;align-items:center;justify-content:center;font-weight:800;border:1px solid var(--silver)}
.bn b{color:var(--navy);display:block}
.bn span{color:var(--mute);font-size:15px}
.bonus-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:8px 24px;max-width:760px;margin:0 auto;text-align:left}
/* price */
.price{max-width:520px;margin:0 auto;text-align:center;position:relative}
.price .old{color:#8896a5;text-decoration:line-through;font-size:20px}
.price .now{font-size:44px;font-weight:800;color:var(--navy);line-height:1.1;margin:4px 0}
.price .save{display:inline-block;background:#e8f6f4;color:#0d6e68;font-weight:600;font-size:14px;border-radius:99px;padding:3px 14px;margin-bottom:14px}
.price .meta{color:var(--mute);font-size:15px;margin-bottom:18px}
.price .list{font-size:14px;color:#5b6b7d;margin-top:12px}
/* pricing grid (hub) */
.pgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;align-items:stretch}
.pgrid .card h3{font-size:20px}
.pgrid .old{color:#8896a5;text-decoration:line-through;font-size:16px;margin-top:8px}
.pgrid .now{font-size:28px;font-weight:800;color:var(--navy);line-height:1.2;margin-bottom:6px}
.pgrid .meta{font-size:15px;color:var(--mute);margin-bottom:12px}
/* register */
.reg{max-width:820px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;text-align:left}
.reg h3{font-size:22px;margin-bottom:4px}
.reg .hint{color:var(--mute);font-size:15px;margin-bottom:20px}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.f{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.f label{font-size:14px;font-weight:600;color:var(--navy)}
.f input,.f select{font:inherit;font-size:16px;padding:12px 14px;border:1.5px solid var(--silver);border-radius:10px;background:#fff;color:var(--ink);min-height:48px}
.f input:focus,.f select:focus{outline:0;border-color:var(--ocean);box-shadow:0 0 0 3px rgba(13,110,140,.15)}
.chk{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--mute);margin:4px 0 18px}
.chk input{margin-top:5px;width:18px;height:18px}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.sum{background:var(--pearl);border-radius:12px;padding:14px 16px;margin-bottom:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:15px}
.sum b{color:var(--navy)}
.secure{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:#5b6b7d;margin-top:14px}
.secure i{flex:0 0 auto;width:22px;height:22px;border-radius:50%;background:#e8f6f4;color:#0d6e68;display:flex;align-items:center;justify-content:center;font-style:normal;font-size:12px;font-weight:700}
.msg{margin-top:14px;padding:12px 14px;border-radius:10px;font-size:15px;display:none}
.msg.err{display:block;background:#fdecea;color:#8a2a20}
.msg.ok{display:block;background:#e8f6f4;color:#0d6e68}
.pay{display:none;text-align:center}
.pay.on{display:block}
.pay .qr{width:240px;height:240px;margin:12px auto;border:1px solid var(--line);border-radius:14px;padding:8px;background:#fff}
.pay .amt{font-size:30px;font-weight:800;color:var(--navy)}
.pay .code{display:inline-block;background:var(--pearl);border:1px dashed var(--silver);border-radius:8px;padding:6px 14px;font-weight:700;letter-spacing:.08em;margin:8px 0}
.pay .state{margin-top:14px;font-size:15px;color:var(--mute)}
.pay .done{display:none}
.pay.paid .wait{display:none}
.pay.paid .done{display:block}
/* community */
.comm{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px;max-width:900px;margin:0 auto;text-align:left}
.comm .card{height:100%}
/* person */
.person{display:grid;grid-template-columns:170px 1fr;gap:32px;align-items:center;max-width:860px;margin:0 auto;text-align:left}
.avatar{width:170px;height:170px;border-radius:50%;background:linear-gradient(135deg,var(--ocean),var(--teal));display:flex;align-items:center;justify-content:center;color:#fff;font-size:50px;font-weight:700}
.person blockquote{border-left:3px solid var(--teal);padding-left:16px;margin-top:16px;color:var(--navy);font-weight:500}
/* faq */
.faq{max-width:820px;margin:0 auto;text-align:left}
details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 20px;margin-bottom:10px}
section.alt details{background:var(--pearl)}
summary{cursor:pointer;padding:18px 0;font-weight:600;color:var(--navy);list-style:none;display:flex;justify-content:space-between;gap:14px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";color:var(--ocean);font-size:22px;line-height:1}
details[open] summary:after{content:"–"}
details p{padding:0 0 18px;color:var(--mute)}
/* final */
.final{background:linear-gradient(160deg,var(--navy),#10375a);color:#fff;text-align:center}
.final h2{color:#fff;max-width:720px;margin:0 auto 14px}
.final p{color:#cfdce6;max-width:620px;margin:0 auto 28px}
.final .btn{background:var(--teal);color:var(--navy)}
.final .btn:hover{background:#fff}
.final .btn.ghost{background:transparent;color:#fff;border-color:#4b6683}
.final .row{justify-content:center}
footer{padding:36px 0 96px;font-size:14px;color:#5b6b7d;text-align:center}
.sticky{display:none}
@media(max-width:700px){
 section{padding:52px 0}
 .person{grid-template-columns:1fr;text-align:center}
 .person blockquote{text-align:left}
 .avatar{margin:0 auto;width:110px;height:110px;font-size:34px}
 .hero{padding:52px 0 48px}
 .btn{width:100%}
 nav .links{display:none}
 nav a.btn{width:auto}
 .f2{grid-template-columns:1fr}
 .reg{padding:22px 18px}
 .price .now{font-size:36px}
 .sticky{display:block;position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--line);padding:10px 16px}
 .sticky .btn{width:100%;min-height:48px}
}

/* quà tặng ebook Bản đồ Số học */
.giftstrip{background:#fff;border-bottom:1px solid var(--line);padding:18px 0}
.gs{display:flex;gap:14px;align-items:center;max-width:860px;margin:0 auto;background:#fffaf0;border:1px solid #ecd9a0;border-radius:14px;padding:14px 18px}
.gs .gic{flex:0 0 auto;width:42px;height:42px;border-radius:12px;background:var(--gold);color:var(--navy);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px}
.gs b{display:block;color:var(--navy);line-height:1.35}
.gs span{display:block;font-size:15px;color:var(--mute);line-height:1.5;margin-top:2px}
.gs em{font-style:normal;font-weight:700;color:#8a6d0b}
.giftbox{display:none;margin:18px 0 6px;text-align:left;background:#fffaf0;border:1px solid #ecd9a0;border-radius:14px;padding:16px 18px}
.giftbox.on{display:block}
.giftbox b{color:var(--navy);display:block;margin-bottom:4px}
.giftbox p{font-size:15px;color:var(--mute);margin-bottom:12px}
/* trang nhận ebook */
.steps{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:0 auto 28px;max-width:760px}
.steps .s{display:flex;align-items:center;gap:8px;font-size:14px;color:#6b7a8a;background:#fff;border:1px solid var(--line);border-radius:99px;padding:6px 14px}
.steps .s i{width:22px;height:22px;border-radius:50%;background:var(--pearl);border:1px solid var(--silver);display:flex;align-items:center;justify-content:center;font-style:normal;font-size:12px;font-weight:700}
.steps .s.done{color:#0d6e68}.steps .s.done i{background:#e8f6f4;border-color:var(--teal);color:#0d6e68}
.steps .s.cur{color:var(--navy);border-color:var(--ocean);font-weight:600}.steps .s.cur i{background:var(--ocean);border-color:var(--ocean);color:#fff}
.claim{max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;text-align:left}
.claim h2{font-size:24px;margin-bottom:4px}
.fs{border:0;margin:22px 0 4px;padding:0}
.fs legend{font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--ocean);font-weight:700;margin-bottom:10px}
.f input[readonly]{background:var(--pearl);color:#5b6b7d;border-style:dashed}
.lockhint{font-size:13px;color:#5b6b7d;margin:-6px 0 14px}
.dob{display:grid;grid-template-columns:1fr 1fr 1.3fr;gap:10px}
.warn{display:flex;gap:10px;background:#fff8e1;border:1px solid #ecd9a0;border-radius:12px;padding:12px 14px;font-size:14px;color:#6b5a14;margin:4px 0 16px}
.warn i{flex:0 0 auto;width:22px;height:22px;border-radius:50%;background:var(--gold);color:var(--navy);display:flex;align-items:center;justify-content:center;font-style:normal;font-weight:800;font-size:13px}
.demo{background:#e8f0ff;color:#27458a;font-size:14px;padding:10px 14px;border-radius:10px;margin-bottom:18px}
.okbox{text-align:center;padding:10px 0}
.okbox .tick{width:64px;height:64px;border-radius:50%;background:#e8f6f4;color:#0d6e68;display:flex;align-items:center;justify-content:center;font-size:30px;margin:0 auto 14px}
.okbox p{color:var(--mute);max-width:520px;margin:8px auto 18px}
.hidden{display:none!important}
@media(max-width:700px){.claim{padding:22px 18px}.dob{grid-template-columns:1fr 1fr}.dob select:last-child{grid-column:1/-1}.gs{align-items:flex-start}}

/* Lộ trình OPC: danh sách buổi theo chặng */
.road .part h3{margin-bottom:6px}
.sess{list-style:none;margin:12px 0 0;padding:0;border-left:2px solid var(--line);margin-left:6px}
.sess li{position:relative;padding:8px 0 12px 20px;display:block}
.sess li:before{content:"";position:absolute;left:-7px;top:13px;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--ocean);transform:none;border-left-width:2px;border-bottom-width:2px}
.sess li.end:before{background:var(--teal);border-color:var(--teal)}
.sess i{display:block;font-style:normal;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--mute)}
.sess b{display:block;font-size:16px;color:var(--navy);margin-top:2px}
.sess span{display:block;font-size:14px;color:#4a5b6e;margin-top:2px}
.sess span.dep{display:inline-block;font-size:12px;font-weight:600;color:var(--ocean);background:#eaf4fa;border-radius:999px;padding:2px 10px;margin-top:5px}

/* Liên kết sang Giải Pháp Số */
.gp-khoi{display:flex;gap:28px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px}
.gp-khoi>div{max-width:620px;text-align:left}
.gp-khoi h2{font-size:clamp(1.3rem,3vw,1.7rem);margin:6px 0 10px}
.gp-khoi p{margin:0;color:var(--mute)}
footer a{color:inherit;text-decoration:underline}