:root{
    --blue:#2563EB; --blue-light:#3B82F6; --blue-dark:#1D4FCF;
    --navy:#1E3A8A; --navy-2:#152B66;
    --orange:#F97316; --orange-dark:#EA6A0C;
    --green:#22C55E; --amber:#FBBF24; --red:#EF4444;
    --bg:#F8FAFC; --ink:#0B1220; --ink-2:#101B34;
    --text:#1E293B; --muted:#64748B; --white:#FFFFFF;
    --border:#E6EBF2;
    --r-sm:10px; --r-md:18px; --r-lg:28px;
    --shadow-card:0 12px 32px rgba(15,23,42,0.08);
    --shadow-hero:0 24px 60px rgba(30,58,138,0.16);
  }
  *{margin:0;padding:0;box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{font-family:'Inter',sans-serif;color:var(--text);background:var(--bg);line-height:1.65;overflow-x:hidden;}
  h1,h2,h3,h4{font-family:'Poppins',sans-serif;}
  a{text-decoration:none;color:inherit;}
  ul{list-style:none;}
  img{max-width:100%;display:block;}
  .wrap{max-width:1260px;margin:0 auto;padding:0 32px;}
  .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--blue);}
  .eyebrow::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--orange);}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:15px 30px;border-radius:999px;font-weight:600;font-size:15px;cursor:pointer;border:none;transition:transform .18s ease, box-shadow .18s ease;font-family:'Inter',sans-serif;white-space:nowrap;}
  .btn:hover{transform:translateY(-2px);}
  .btn-primary{background:linear-gradient(135deg,var(--blue) 0%, var(--navy) 100%);color:#fff;box-shadow:0 10px 26px rgba(37,99,235,0.38);}
  .btn-primary:hover{box-shadow:0 14px 34px rgba(37,99,235,0.48);}
  .btn-accent{background:linear-gradient(135deg,var(--orange) 0%, var(--orange-dark) 100%);color:#fff;box-shadow:0 10px 26px rgba(249,115,22,0.38);}
  .btn-ghost{background:rgba(255,255,255,0.7);color:var(--navy);border:1.5px solid var(--border);backdrop-filter:blur(8px);}
  .btn-ghost-dark{background:rgba(255,255,255,0.08);color:#fff;border:1.5px solid rgba(255,255,255,0.18);backdrop-filter:blur(8px);}
  .btn-sm{padding:11px 22px;font-size:13.5px;}

  header{position:sticky;top:0;z-index:100;background:rgba(248,250,252,0.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);}
  nav{display:flex;align-items:center;justify-content:space-between;padding:14px 32px;max-width:1260px;margin:0 auto;}
  .logo-img{height:36px;width:auto;}
  .nav-links{display:flex;align-items:center;gap:34px;font-size:14.5px;font-weight:600;}
  .nav-links a{padding:6px 0;transition:color .2s ease;}
  .nav-links a:hover{color:var(--blue);}
  .nav-cta{display:flex;align-items:center;gap:16px;}
  .link-btn{font-weight:600;font-size:14.5px;color:var(--navy);}

  /* HERO */
  .hero{position:relative;padding:88px 0 60px;isolation:isolate;}
  .hero-bg{position:absolute;inset:0;z-index:-1;overflow:hidden;}
  .blob{position:absolute;border-radius:50%;filter:blur(50px);opacity:.55;}
  .blob-1{width:520px;height:520px;background:radial-gradient(circle,rgba(37,99,235,0.22),transparent 70%);top:-180px;right:-140px;}
  .blob-2{width:420px;height:420px;background:radial-gradient(circle,rgba(249,115,22,0.16),transparent 70%);bottom:-160px;left:-120px;}
  .hero-grid{display:grid;grid-template-columns:1.02fr 0.98fr;gap:56px;align-items:center;}
  .hero-badge{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--border);border-radius:999px;padding:7px 16px 7px 8px;font-size:13px;font-weight:600;color:var(--text);box-shadow:var(--shadow-card);margin-bottom:24px;}
  .hero-badge .dot-icon{width:24px;height:24px;border-radius:50%;background:linear-gradient(135deg,var(--green),#16A34A);display:flex;align-items:center;justify-content:center;color:#fff;font-size:12px;}
  .hero h1{font-size:54px;line-height:1.06;font-weight:700;color:var(--ink);margin-bottom:22px;letter-spacing:-0.015em;}
  .hero h1 .hl{background:linear-gradient(135deg,var(--blue),var(--navy));-webkit-background-clip:text;background-clip:text;color:transparent;}
  .hero h1 .underline{position:relative;white-space:nowrap;}
  .hero p.lead{font-size:18px;color:var(--muted);max-width:520px;margin-bottom:32px;}
  .hero-actions{display:flex;gap:16px;margin-bottom:40px;flex-wrap:wrap;}
  .hero-avatars{display:flex;align-items:center;gap:14px;}
  .avatar-stack{display:flex;}
  .avatar-stack span{width:38px;height:38px;border-radius:50%;border:3px solid var(--bg);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#fff;margin-left:-12px;}
  .avatar-stack span:first-child{margin-left:0;}
  .hero-avatars small{font-size:13.5px;color:var(--muted);font-weight:500;}
  .hero-avatars b{color:var(--ink);}

  /* HERO VISUAL: product preview mockup */
  .hero-visual{position:relative;}
  .browser-card{background:#fff;border-radius:var(--r-lg);box-shadow:var(--shadow-hero);border:1px solid var(--border);overflow:hidden;transform:rotate(1.2deg);}
  .browser-bar{background:#F1F5F9;padding:12px 16px;display:flex;align-items:center;gap:6px;border-bottom:1px solid var(--border);}
  .browser-bar span{width:9px;height:9px;border-radius:50%;background:#CBD5E1;}
  .browser-body{padding:24px;}
  .bb-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;}
  .bb-top h4{font-size:14px;font-weight:600;color:var(--ink);}
  .bb-top span{font-size:11.5px;background:var(--bg);color:var(--muted);padding:4px 10px;border-radius:999px;font-weight:600;}
  .progress-ring-row{display:flex;gap:16px;margin-bottom:20px;}
  .stat-mini{flex:1;background:var(--bg);border-radius:14px;padding:14px 16px;}
  .stat-mini .num{font-family:'Poppins',sans-serif;font-size:22px;font-weight:700;color:var(--ink);}
  .stat-mini .lbl{font-size:11.5px;color:var(--muted);font-weight:500;margin-top:2px;}
  .stat-mini.blue .num{color:var(--blue);}
  .stat-mini.orange .num{color:var(--orange);}
  .chapter-row{display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--border);}
  .chapter-row:first-of-type{border-top:none;}
  .chap-icon{width:34px;height:34px;border-radius:9px;background:#EFF4FF;color:var(--blue);display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0;}
  .chap-info{flex:1;}
  .chap-info .t{font-size:13.5px;font-weight:600;color:var(--ink);}
  .chap-bar{height:5px;background:var(--border);border-radius:99px;margin-top:6px;overflow:hidden;}
  .chap-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green));border-radius:99px;}
  .chap-pct{font-size:12px;font-weight:700;color:var(--muted);}
  .float-card{position:absolute;background:#fff;border-radius:16px;box-shadow:var(--shadow-card);padding:14px 18px;display:flex;align-items:center;gap:12px;border:1px solid var(--border);}
  .float-card .fc-icon{width:38px;height:38px;border-radius:11px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:17px;}
  .float-card .fc-t{font-size:12.5px;font-weight:700;color:var(--ink);}
  .float-card .fc-s{font-size:11px;color:var(--muted);}
  .fc-1{top:-24px;left:-32px;}
  .fc-1 .fc-icon{background:linear-gradient(135deg,var(--amber),#F59E0B);}
  .fc-2{bottom:-22px;right:-28px;}
  .fc-2 .fc-icon{background:linear-gradient(135deg,var(--green),#16A34A);}

  /* TRUST STRIP */
  .trust{padding:30px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:#fff;}
  .trust-row{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px;}
  .trust-item{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);font-weight:500;}
  .trust-item i{color:var(--blue);font-size:18px;}

  .section{padding:100px 0;}
  .section-head{max-width:640px;margin-bottom:56px;}
  .section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
  .section-head h2{font-size:38px;font-weight:700;color:var(--ink);margin:14px 0 12px;letter-spacing:-0.015em;}
  .section-head p{font-size:16.5px;color:var(--muted);}

  /* LEARNING CHAIN section (moved into its own section, richer) */
  .chain-section{background:linear-gradient(180deg,#fff, var(--bg));}
  .chain-layout{display:grid;grid-template-columns:0.9fr 1.1fr;gap:64px;align-items:center;}
  .chain{position:relative;padding-left:46px;}
  .chain::before{content:"";position:absolute;left:18px;top:6px;bottom:6px;width:2px;background:var(--border);}
  .chain-fill{position:absolute;left:18px;top:6px;width:2px;background:linear-gradient(180deg,var(--blue),var(--orange));height:0%;transition:height 1.8s cubic-bezier(.4,0,.2,1);}
  .chain-node{position:relative;padding:12px 0;opacity:0;transform:translateX(-10px);transition:opacity .5s ease, transform .5s ease;}
  .chain-node.show{opacity:1;transform:translateX(0);}
  .chain-node .dot{position:absolute;left:-46px;top:14px;width:38px;height:38px;border-radius:11px;background:#fff;border:1.5px solid var(--border);display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--muted);transition:all .4s ease;}
  .chain-node.show .dot{border-color:var(--blue);color:var(--blue);background:#EFF4FF;box-shadow:0 4px 12px rgba(37,99,235,0.18);}
  .chain-node .title{font-weight:600;font-size:16px;color:var(--ink);}
  .chain-node .desc{font-size:13.5px;color:var(--muted);margin-top:2px;}

  /* FEATURE GRID */
  .feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
  .feature-card{background:#fff;border:1px solid var(--border);border-radius:var(--r-md);padding:30px 26px;transition:transform .25s ease, box-shadow .25s ease, border-color .25s ease;}
  .feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-card);border-color:transparent;}
  .feature-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:22px;color:#fff;margin-bottom:20px;}
  .feature-card h3{font-size:18px;font-weight:600;margin-bottom:8px;color:var(--ink);}
  .feature-card p{font-size:14.5px;color:var(--muted);}
  .fi-1{background:linear-gradient(135deg,var(--blue),#3B82F6);}
  .fi-2{background:linear-gradient(135deg,var(--orange),#FB923C);}
  .fi-3{background:linear-gradient(135deg,var(--navy),#2947A8);}
  .fi-4{background:linear-gradient(135deg,var(--green),#16A34A);}
  .fi-5{background:linear-gradient(135deg,#7C3AED,#A78BFA);}
  .fi-6{background:linear-gradient(135deg,var(--amber),#F59E0B);}

  /* CLASS PICKER */
  .class-section{background:#fff;}
  .class-tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:32px;}
  .class-tab{padding:11px 24px;border-radius:999px;border:1.5px solid var(--border);font-weight:600;font-size:14px;color:var(--text);cursor:pointer;background:#fff;transition:all .2s ease;}
  .class-tab.active{background:linear-gradient(135deg,var(--blue),var(--navy));color:#fff;border-color:transparent;box-shadow:0 8px 20px rgba(37,99,235,0.32);}
  .class-panel{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:14px;}
  .subject-chip{background:var(--bg);border:1px solid var(--border);border-radius:var(--r-sm);padding:17px 18px;font-size:14px;font-weight:600;color:var(--text);display:flex;align-items:center;gap:10px;transition:all .2s ease;}
  .subject-chip:hover{border-color:var(--blue);background:#EFF4FF;}
  .subject-chip i{color:var(--blue);font-size:16px;}

  /* AI SPOTLIGHT */
  .ai-section{background:var(--ink);color:#fff;position:relative;overflow:hidden;}
  .ai-section::before{content:"";position:absolute;top:-30%;right:-10%;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(37,99,235,0.28),transparent 65%);}
  .ai-section::after{content:"";position:absolute;bottom:-25%;left:-8%;width:440px;height:440px;border-radius:50%;background:radial-gradient(circle,rgba(249,115,22,0.16),transparent 65%);}
  .ai-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;position:relative;z-index:1;}
  .ai-section .eyebrow{color:#93C5FD;}
  .ai-section h2{color:#fff;font-size:36px;font-weight:700;margin:14px 0 16px;}
  .ai-section p.lead{color:#94A3B8;font-size:16px;margin-bottom:28px;max-width:460px;}
  .ai-feature-list{display:flex;flex-direction:column;gap:14px;margin-bottom:32px;}
  .ai-feature-list li{display:flex;align-items:center;gap:12px;font-size:14.5px;color:#CBD5E1;}
  .ai-feature-list i{color:var(--green);font-size:17px;}
  .chat-mock{background:rgba(255,255,255,0.045);border:1px solid rgba(255,255,255,0.1);border-radius:var(--r-lg);padding:26px;backdrop-filter:blur(10px);}
  .chat-mock .chat-head{display:flex;align-items:center;gap:10px;padding-bottom:16px;border-bottom:1px solid rgba(255,255,255,0.08);margin-bottom:16px;}
  .chat-mock .chat-head .avatar{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--orange));display:flex;align-items:center;justify-content:center;font-size:16px;}
  .chat-mock .chat-head span{font-size:13.5px;font-weight:600;color:#fff;}
  .chat-mock .chat-head small{display:block;font-size:11.5px;color:#64748B;}
  .bubble{border-radius:14px;padding:13px 16px;font-size:13.5px;margin-bottom:12px;max-width:87%;line-height:1.55;}
  .bubble.user{background:rgba(37,99,235,0.2);color:#DBEAFE;margin-left:auto;border-bottom-right-radius:4px;}
  .bubble.ai{background:rgba(255,255,255,0.06);color:#E2E8F0;border-bottom-left-radius:4px;}

  /* PORTALS */
  .portal-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
  .portal-card{border-radius:var(--r-md);padding:28px 22px;position:relative;overflow:hidden;border:1px solid var(--border);background:#fff;transition:transform .25s ease, box-shadow .25s ease;}
  .portal-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-card);}
  .portal-card h3{font-size:17px;font-weight:600;margin:16px 0 8px;color:var(--ink);}
  .portal-card p{font-size:13.5px;color:var(--muted);margin-bottom:16px;}
  .portal-card .icon-wrap{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;}
  .portal-card a{font-size:13.5px;font-weight:600;color:var(--blue);display:inline-flex;align-items:center;gap:4px;}
  .p1 .icon-wrap{background:linear-gradient(135deg,var(--blue),#3B82F6);}
  .p2 .icon-wrap{background:linear-gradient(135deg,var(--orange),#FB923C);}
  .p3 .icon-wrap{background:linear-gradient(135deg,var(--navy),#2947A8);}
  .p4 .icon-wrap{background:linear-gradient(135deg,var(--green),#16A34A);}

  /* TESTIMONIALS */
  .testi-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
  .testi-card{background:#fff;border:1px solid var(--border);border-radius:var(--r-md);padding:28px;}
  .testi-stars{color:var(--amber);font-size:15px;margin-bottom:14px;letter-spacing:2px;}
  .testi-card p{font-size:14.5px;color:var(--text);margin-bottom:20px;line-height:1.6;}
  .testi-person{display:flex;align-items:center;gap:12px;}
  .testi-avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:13px;}
  .testi-person b{font-size:13.5px;color:var(--ink);display:block;}
  .testi-person span{font-size:12px;color:var(--muted);}

  /* PRICING */
  .pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .price-card{background:#fff;border:1.5px solid var(--border);border-radius:var(--r-lg);padding:34px 28px;position:relative;}
  .price-card.featured{border-color:var(--blue);box-shadow:0 18px 44px rgba(37,99,235,0.2);transform:scale(1.03);}
  .price-badge{position:absolute;top:-13px;left:28px;background:linear-gradient(135deg,var(--orange),var(--orange-dark));color:#fff;font-size:11.5px;font-weight:700;padding:5px 14px;border-radius:999px;}
  .price-card h3{font-size:15px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.03em;margin-bottom:10px;}
  .price-card .amount{font-family:'Poppins',sans-serif;font-size:38px;font-weight:700;color:var(--ink);}
  .price-card .amount span{font-size:15px;font-weight:500;color:var(--muted);}
  .price-list{margin:24px 0 28px;display:flex;flex-direction:column;gap:12px;}
  .price-list li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text);}
  .price-list i{color:var(--green);font-size:16px;}
  .price-card .btn{width:100%;}

  /* APP DOWNLOAD */
  .app-section{background:linear-gradient(135deg,#EFF4FF, #FFF7ED);}
  .app-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;}
  .app-badges{display:flex;gap:14px;margin-top:28px;}
  .store-badge{display:flex;align-items:center;gap:10px;background:var(--ink);color:#fff;padding:12px 20px;border-radius:12px;font-size:13px;}
  .store-badge i{font-size:24px;}
  .store-badge small{display:block;font-size:10px;color:#94A3B8;}
  .store-badge b{font-size:14px;font-weight:600;}
  .phone-mock{width:220px;height:440px;background:var(--ink);border-radius:32px;padding:10px;margin:0 auto;box-shadow:var(--shadow-hero);position:relative;}
  .phone-screen{width:100%;height:100%;background:#fff;border-radius:24px;overflow:hidden;padding:20px 16px;}
  .phone-screen .ps-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
  .phone-screen .ps-head b{font-size:13px;color:var(--ink);}
  .phone-mini-card{background:var(--bg);border-radius:12px;padding:12px;margin-bottom:10px;}
  .phone-mini-card .t{font-size:11.5px;font-weight:600;color:var(--ink);margin-bottom:6px;}
  .phone-mini-bar{height:4px;background:var(--border);border-radius:99px;overflow:hidden;}
  .phone-mini-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--green));}

  /* CTA BANNER */
  .cta-banner{background:linear-gradient(120deg,var(--blue) 0%, var(--navy) 100%);border-radius:var(--r-lg);padding:58px 60px;display:flex;align-items:center;justify-content:space-between;gap:40px;color:#fff;position:relative;overflow:hidden;}
  .cta-banner::after{content:"";position:absolute;right:-60px;top:-60px;width:280px;height:280px;background:radial-gradient(circle,rgba(249,115,22,0.35),transparent 70%);}
  .cta-banner h2{font-size:29px;font-weight:700;margin-bottom:8px;position:relative;z-index:1;}
  .cta-banner p{color:#BFDBFE;font-size:15px;position:relative;z-index:1;}
  .cta-actions{display:flex;gap:14px;position:relative;z-index:1;flex-shrink:0;}

  footer{background:var(--ink);color:#94A3B8;padding:64px 0 28px;margin-top:96px;}
  .footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;gap:32px;margin-bottom:48px;}
  .footer-logo-img{height:34px;width:auto;margin-bottom:14px;}
  footer p.tag{font-size:13.5px;color:#64748B;max-width:260px;}
  footer h4{font-size:13px;font-weight:600;color:#fff;text-transform:uppercase;letter-spacing:.04em;margin-bottom:18px;}
  footer ul li{margin-bottom:11px;}
  footer ul a{font-size:14px;color:#94A3B8;transition:color .2s ease;}
  footer ul a:hover{color:#fff;}
  .footer-social{display:flex;gap:12px;margin-top:18px;}
  .footer-social a{width:34px;height:34px;border-radius:9px;background:rgba(255,255,255,0.06);display:flex;align-items:center;justify-content:center;font-size:15px;color:#fff;}
  .footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:24px;display:flex;justify-content:space-between;font-size:13px;color:#64748B;flex-wrap:wrap;gap:12px;}

  @media(max-width:960px){
    .hero-grid,.ai-grid,.chain-layout,.app-grid{grid-template-columns:1fr;}
    .feature-grid,.portal-grid,.pricing-grid,.testi-grid{grid-template-columns:repeat(2,1fr);}
    .footer-grid{grid-template-columns:repeat(2,1fr);}
    .nav-links{display:none;}
    .hero h1{font-size:38px;}
    .cta-banner{flex-direction:column;text-align:center;padding:40px 28px;}
    .hero-visual{margin-top:40px;}
  }
  @media(max-width:600px){
    .feature-grid,.portal-grid,.pricing-grid,.footer-grid,.testi-grid{grid-template-columns:1fr;}
    .price-card.featured{transform:none;}
    .wrap{padding:0 20px;}
  }