:root{
      --blue:#0066ff; --blue-dark:#002b5c; --blue-deep:#001932; --blue-soft:#eaf6ff;
      --cyan:#16c7ff; --green:#20c86b; --text:#0b1f33; --muted:#5d7085; --line:#dcecf8;
      --shadow:0 24px 60px rgba(0,40,90,.12);
    }
    *{margin:0;padding:0;box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
    a{text-decoration:none;color:inherit}
    img{max-width:100%;display:block}
    h1,h2,h3,h4{font-family:"Cormorant Garamond",Georgia,serif;font-weight:600;line-height:1}
    .container{width:min(1180px,92%);margin:0 auto}
    section{padding:68px 0}

    header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(220,236,248,.72)}
    .nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}
    .brand img{width:206px;height:auto;object-fit:contain}
    .menu{display:flex;align-items:center;gap:18px;color:#1f3a52;font-size:14px;font-weight:800}
    .menu a:hover{color:var(--blue)}
    .menu-cta{background:var(--green);color:#fff !important;padding:12px 18px;border-radius:999px;box-shadow:0 14px 30px rgba(32,200,107,.24)}
    .mobile-toggle{display:none;background:transparent;border:0;color:var(--blue-dark);cursor:pointer}

    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:56px;padding:0 26px;border-radius:999px;font-weight:800;font-size:15px;transition:.2s}
    .btn-primary{background:var(--blue);color:#fff}
    .btn-primary:hover{background:var(--blue-dark)}
    .btn-green{background:var(--green);color:#fff}
    .btn-green:hover{filter:brightness(.95)}
    .btn-outline{border:2px solid rgba(255,255,255,.5);color:#fff}
    .btn-outline:hover{background:rgba(255,255,255,.12)}

    .tag{display:inline-flex;border-radius:999px;padding:8px 14px;background:var(--blue-soft);color:var(--blue);font-size:12px;font-weight:900;text-transform:uppercase;letter-spacing:.1em}

    .hero{min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;color:#fff;padding:120px 0 90px;
      background:linear-gradient(105deg,rgba(0,25,50,.96) 0%,rgba(0,55,110,.78) 44%,rgba(0,25,50,.45) 100%),url('../images/curso-mergulhador-hero.jpg');
      background-size:cover;background-position:center}
    .sdi-hero-logo{filter:brightness(0) invert(1);opacity:.88;display:block;width:96px;height:auto;margin-bottom:18px}
    .hero::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:140px;background:linear-gradient(to top,#fff,transparent)}
    .hero-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
    .hero .tag{background:rgba(255,255,255,.14);color:#eaf9ff}
    .hero h1{font-size:clamp(44px,6vw,84px);line-height:1.03;margin:20px 0 0;letter-spacing:-.02em}
    .hero p{font-size:20px;color:#dff2ff;max-width:620px;margin:24px 0 0}
    .hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:34px}
    .hero-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);border-radius:24px;padding:26px;backdrop-filter:blur(14px)}
    .hero-stats div{text-align:center}
    .hero-stats strong{display:block;font-family:'Inter',Arial,sans-serif;font-weight:800;letter-spacing:-0.04em;font-size:36px;color:#fff}
    .hero-stats span{font-size:12px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#bfe6ff}

    .section-head{max-width:880px;margin-bottom:46px}
    .section-head.center{text-align:center;margin-left:auto;margin-right:auto}
    .section-head h2{font-size:clamp(40px,5vw,76px);color:var(--blue-deep);margin-top:16px;line-height:1.02}
    .section-head p{margin-top:18px;color:var(--muted);font-size:18px;line-height:1.7}

    .levels{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
    .level{border:1px solid var(--line);border-radius:26px;background:#fff;overflow:hidden;box-shadow:0 14px 42px rgba(0,50,100,.06);display:flex;flex-direction:column;transition:.25s}
    .level:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:var(--cyan)}
    .level-media{display:block;aspect-ratio:16/9;background-size:cover;background-position:center;position:relative;overflow:hidden;transition:opacity .18s}
    .level-media:hover{opacity:.9}
    .level-step{position:absolute;left:14px;top:14px;z-index:1;background:rgba(0,25,50,.72);color:#fff;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:7px 12px;border-radius:999px;backdrop-filter:blur(6px)}

    /* SEO: imagem de fundo via <img> real */
    .bg-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;display:block;pointer-events:none;z-index:0}
    .level-body{padding:28px;display:flex;flex-direction:column;gap:12px;flex:1}
    .level-body h3{font-size:32px;color:var(--blue-deep)}
    .level-body p{color:var(--muted);font-size:15px;line-height:1.62}
    .level-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:8px}
    .level-meta em{font-style:normal;background:var(--blue-soft);color:var(--blue-dark);font-size:12px;font-weight:800;padding:6px 10px;border-radius:999px}
    .level-cta-row{display:flex;flex-direction:column;gap:8px;margin-top:18px}
    .level-cta{display:block;background:var(--green);color:#fff;font-weight:700;font-size:15px;text-align:center;padding:14px 20px;border-radius:10px;transition:filter .18s}
    .level-cta:hover{filter:brightness(.92)}
    .level-cta-wa{display:block;border:2px solid var(--green);color:var(--green);font-weight:700;font-size:14px;text-align:center;padding:12px 20px;border-radius:10px;transition:.18s}
    .level-cta-wa:hover{background:var(--green);color:#fff}

    .why{background:linear-gradient(180deg,#f4fbff 0%,#fff 100%)}
    .why-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
    .why-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:30px}
    .why-card span{display:block;color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.12em;text-transform:uppercase;margin-bottom:14px}
    .why-card h3{font-size:25px;color:var(--blue-deep);margin-bottom:10px}
    .why-card p{color:var(--muted);font-size:15px;line-height:1.62}

    .next{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
    .next a{display:inline-flex;align-items:center;gap:8px;background:var(--blue-soft);color:var(--blue-dark);font-weight:800;font-size:14px;padding:12px 16px;border-radius:999px;transition:.18s}
    .next a:hover{background:var(--blue);color:#fff}

    .cta-final{background:radial-gradient(circle at 16% 0%,rgba(22,199,255,.14),transparent 32%),linear-gradient(180deg,#001932 0%,#002b5c 100%);color:#fff;text-align:center}
    .cta-final h2{font-size:clamp(38px,4.6vw,68px);line-height:1.04}
    .cta-final p{color:#cfe6ff;max-width:620px;margin:18px auto 30px;font-size:18px}
    .cta-final .hero-actions{justify-content:center}

    footer{background:var(--blue-deep);color:#fff;padding:70px 0 34px}
    .footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:22px;align-items:start}
    .footer-card{border:1px solid rgba(255,255,255,.12);background:rgba(255,255,255,.06);border-radius:24px;padding:22px}
    .footer-card img{width:210px;background:transparent;margin-bottom:16px}
    .footer-card p,.footer-card a{color:#dff6ff;font-size:14px;line-height:1.55;display:block;margin-bottom:8px}
    .footer-card h3{color:#fff;font-size:30px;margin-bottom:12px}
    .footer-card a:hover{color:var(--cyan)}
    .bottom{margin-top:22px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);color:#bcd6e8;font-size:13px;display:flex;justify-content:space-between;gap:18px}

    .sticky-mobile{display:none;position:fixed;left:12px;right:12px;bottom:12px;z-index:110;border-radius:999px;background:var(--green);color:#fff;font-weight:800;text-align:center;padding:16px;box-shadow:0 16px 40px rgba(32,200,107,.34)}

    @media (max-width:1040px){
      .menu{display:none}
      .hero-grid,.levels,.why-grid,.footer-grid{grid-template-columns:1fr}
      .levels{grid-template-columns:1fr 1fr}
    }
    @media (max-width:720px){
      section{padding:64px 0}
      .brand img{width:176px}
      .hero{padding-top:104px;min-height:auto}
      .levels,.why-grid{grid-template-columns:1fr}
      .hero-stats{grid-template-columns:1fr}
      .hero-actions .btn{width:100%}
      .sticky-mobile{display:block}
      body{padding-bottom:84px}
      .bottom{flex-direction:column;text-align:center;gap:8px}
    }
    @media (max-width:480px){
      section{padding:48px 0}
      .container{width:min(1180px,94%)}
      .hero h1{font-size:clamp(34px,7vw,46px);line-height:1.05}
      .hero-stats{gap:10px;padding:18px}
      .levels,.why-grid{gap:14px}
      .level-body{padding:18px}
    }