/* ============================================================
     HACKSPRINT — 2027 CONCEPT
     Dark blue / slate theme, Bootstrap-style 12-col rhythm
     ============================================================ */

  :root{
    --bg:#060a12;
    --bg-2:#0a1120;
    --surface:#0e1728;
    --surface-2:#131f36;
    --surface-3:#182741;
    --line:rgba(148,163,184,.14);
    --line-strong:rgba(148,163,184,.26);
    --text:#e8eefb;
    --text-2:#c2cfe3;
    --muted:#8ea0bd;
    --accent:#4f8cff;
    --accent-2:#22d3ee;
    --accent-soft:rgba(79,140,255,.14);
    --ok:#34d399;
    --radius:16px;
    --radius-sm:10px;
    --shadow:0 20px 60px -20px rgba(0,0,0,.75);
    --max:1180px;
    --font:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  }

  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    background:
      radial-gradient(1100px 600px at 80% -10%, rgba(79,140,255,.16), transparent 60%),
      radial-gradient(900px 500px at -10% 10%, rgba(34,211,238,.08), transparent 55%),
      var(--bg);
    color:var(--text);
    font-family:var(--font);
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;height:auto;display:block}
  a{color:inherit;text-decoration:none}
  h1,h2,h3,h4{line-height:1.15;letter-spacing:-.02em;margin:0;font-weight:650}
  p{margin:0}
  ::selection{background:rgba(79,140,255,.35)}

  .wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:24px}
  .section{padding:96px 0;position:relative}
  .section--tight{padding:64px 0}
  .divider{height:1px;background:var(--line);border:0;margin:0}

  /* ---------- shared bits ---------- */
  .eyebrow{
    display:inline-flex;align-items:center;gap:8px;
    font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
    color:var(--accent-2);
  }
  .eyebrow::before{content:"";width:22px;height:1px;background:var(--accent-2);opacity:.7}
  .section-head{max-width:720px;margin-bottom:52px}
  .section-head h2{font-size:clamp(28px,3.4vw,42px);margin-top:14px}
  .section-head p{color:var(--muted);margin-top:16px;font-size:17px;max-width:60ch}

  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:10px;
    height:48px;padding:0 22px;border-radius:12px;
    font-weight:600;font-size:15px;border:1px solid transparent;
    transition:transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease;
    cursor:pointer;white-space:nowrap;
  }
  .btn:hover{transform:translateY(-1px)}
  .btn--primary{
    background:linear-gradient(180deg,#5b95ff,#3f7bf0);
    color:#fff;box-shadow:0 10px 30px -12px rgba(79,140,255,.9);
  }
  .btn--primary:hover{background:linear-gradient(180deg,#6aa0ff,#4a85f5)}
  .btn--ghost{
    background:rgba(255,255,255,.03);border-color:var(--line-strong);color:var(--text-2);
  }
  .btn--ghost:hover{background:rgba(255,255,255,.06);border-color:rgba(148,163,184,.4)}
  .btn svg{width:16px;height:16px}

  .chip{
    display:inline-flex;align-items:center;gap:8px;
    padding:8px 12px;border-radius:999px;
    border:1px solid var(--line);background:rgba(255,255,255,.02);
    color:var(--text-2);font-size:13px;font-weight:500;
  }
  .dot{width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(52,211,153,.12)}

  /* ---------- nav ---------- */
  .nav{
    position:sticky;top:0;z-index:50;
    backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
    background:rgba(6,10,18,.72);
    border-bottom:1px solid var(--line);
  }
  .nav__inner{display:flex;align-items:center;gap:28px;height:72px}
  .brand{display:flex;align-items:center;gap:11px;font-weight:700;letter-spacing:-.02em;font-size:17px}
  .brand__logo{width:34px;height:34px;object-fit:contain;flex:none;filter:drop-shadow(0 6px 14px rgba(79,140,255,.35))}
  .nav__links{display:flex;align-items:center;gap:26px;margin-left:auto}
  .nav__links a{color:var(--text-2);font-size:14.5px;font-weight:500;transition:color .15s}
  .nav__links a:hover{color:#fff}
  .nav__cta{margin-left:8px}
.nav__auth{display:flex;align-items:center;gap:16px;margin-left:8px}
  .nav__toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:10px;color:var(--text);width:42px;height:42px;cursor:pointer}

  /* ---------- hero ---------- */
  .hero{padding:88px 0 72px;position:relative;overflow:hidden}
  .hero::before{
    content:"";position:absolute;inset:0;pointer-events:none;
    background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
    background-size:64px 64px;
    mask-image:radial-gradient(70% 60% at 50% 0%,#000 0%,transparent 75%);
    opacity:.35;
  }
  .hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;position:relative}
  .hero h1{font-size:clamp(36px,5vw,60px);letter-spacing:-.035em;margin:22px 0 0}
  .hero h1 .grad{
    background:linear-gradient(100deg,#7fb0ff 0%,#4f8cff 45%,#22d3ee 100%);
    -webkit-background-clip:text;background-clip:text;color:transparent;
  }
  .hero p.lead{color:var(--muted);font-size:18px;margin-top:22px;max-width:54ch}
  .hero__actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
  .hero__meta{display:flex;gap:22px;margin-top:34px;flex-wrap:wrap;color:var(--muted);font-size:13.5px}
  .hero__meta span{display:inline-flex;align-items:center;gap:8px}
  .hero__meta svg{width:15px;height:15px;color:var(--accent-2)}

  /* code card */
  .code-card{
    background:linear-gradient(180deg,var(--surface-2),var(--surface));
    border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);
    overflow:hidden;transform:perspective(1200px) rotateY(-4deg) rotateX(2deg);
  }
  .code-card__bar{display:flex;align-items:center;gap:8px;padding:14px 16px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
  .code-card__bar i{width:10px;height:10px;border-radius:50%;background:#33415c;display:block}
  .code-card__bar i:nth-child(1){background:#ff5f57}
  .code-card__bar i:nth-child(2){background:#febc2e}
  .code-card__bar i:nth-child(3){background:#28c840}
  .code-card__bar span{margin-left:8px;font-family:var(--mono);font-size:12px;color:var(--muted)}
  .code-card pre{margin:0;padding:20px 20px 26px;font-family:var(--mono);font-size:13px;line-height:1.75;overflow:auto;color:#b9c8e2}
  .k{color:#7fb0ff}.s{color:#7ee2c4}.c{color:#5b6b86}.f{color:#e6c07b}.n{color:#d7a3ff}

  /* ---------- stats ---------- */
  .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
  .stat{background:var(--bg-2);padding:26px 24px}
  .stat b{display:block;font-size:30px;letter-spacing:-.03em;font-weight:700}
  .stat b em{font-style:normal;color:var(--accent)}
  .stat span{color:var(--muted);font-size:13.5px}

  /* ---------- cards / grids ---------- */
  .grid{display:grid;gap:20px}
  .grid--2{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(4,1fr)}

  .card{
    background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01));
    border:1px solid var(--line);border-radius:var(--radius);
    padding:28px;transition:border-color .2s, transform .2s, background .2s;
  }
  .card:hover{border-color:rgba(79,140,255,.45);transform:translateY(-3px)}
  .card__icon{
    width:44px;height:44px;border-radius:12px;display:grid;place-items:center;
    background:var(--accent-soft);border:1px solid rgba(79,140,255,.28);color:var(--accent);
    margin-bottom:20px;
  }
  .card__icon svg{width:21px;height:21px}
  .card h3{font-size:18px;margin-bottom:10px}
  .card p{color:var(--muted);font-size:14.5px}
  .card ul{margin:16px 0 0;padding:0;list-style:none;display:grid;gap:8px}
  .card li{color:var(--text-2);font-size:13.5px;display:flex;gap:9px;align-items:flex-start}
  .card li::before{content:"";width:5px;height:5px;border-radius:50%;background:var(--accent);margin-top:8px;flex:none}

  /* ---------- why ---------- */
  .split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:start}
  .feature{display:flex;gap:16px;padding:20px 0;border-bottom:1px solid var(--line)}
  .feature:last-child{border-bottom:0}
  .feature__n{
    font-family:var(--mono);font-size:12px;color:var(--accent);
    width:34px;height:34px;border-radius:9px;border:1px solid rgba(79,140,255,.3);
    display:grid;place-items:center;flex:none;background:var(--accent-soft);
  }
  .feature h3{font-size:16px;margin-bottom:5px}
  .feature p{color:var(--muted);font-size:14px}

  /* ---------- timeline ---------- */
  .timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;position:relative;margin-top:8px}
  .timeline::before{content:"";position:absolute;top:22px;left:0;right:0;height:1px;background:var(--line)}
  .step{position:relative;padding-top:52px}
  .step::before{
    content:"";position:absolute;top:15px;left:0;width:14px;height:14px;border-radius:50%;
    background:var(--bg);border:2px solid var(--accent);
  }
  .step h3{font-size:15px;margin-bottom:6px}
  .step p{color:var(--muted);font-size:13.5px}
  .step small{display:block;font-family:var(--mono);font-size:11px;color:var(--accent-2);margin-bottom:8px;letter-spacing:.1em}

  /* ---------- client projects ---------- */
  .clients{display:grid;grid-template-columns:repeat(auto-fill,minmax(236px,1fr));gap:18px}
  .client{
    display:flex;flex-direction:column;overflow:hidden;color:inherit;text-decoration:none;
    border:1px solid var(--line);border-radius:var(--radius);
    background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.012));
    transition:border-color .2s,transform .2s,box-shadow .2s;
  }
  .client:hover,.client:focus-visible{
    border-color:rgba(79,140,255,.5);transform:translateY(-3px);
    box-shadow:0 18px 40px -24px rgba(79,140,255,.7);
  }
  .client__media{
    height:156px;display:block;padding:24px;overflow:hidden;
    background:
      radial-gradient(340px 170px at 30% 20%,rgba(79,140,255,.2),transparent 65%),
      linear-gradient(160deg,#0d1729,#101c30);
    border-bottom:1px solid var(--line);
  }
  .client__media img{width:100%;height:100%;object-fit:contain;display:block;transition:transform .25s ease}
  .client:hover .client__media img{transform:scale(1.05)}
  .client__body{padding:17px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px}
  .client__body>div{min-width:0}
  .client__body h3{font-size:15.5px;margin:0 0 3px}
  .client__body span{display:block;font-family:var(--mono);font-size:11px;color:var(--muted);letter-spacing:.02em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .client__go{flex:none;width:16px;height:16px;color:var(--accent)}
  .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
  .tag{font-size:11.5px;padding:5px 10px;border-radius:999px;border:1px solid var(--line);color:var(--muted);background:rgba(255,255,255,.02)}

  /* ---------- testimonial ---------- */
  .quote{
    background:linear-gradient(180deg,var(--surface-2),var(--surface));
    border:1px solid var(--line);border-radius:var(--radius);padding:30px;
  }
  .quote p{font-size:16px;color:var(--text-2);line-height:1.65}
  .quote__who{display:flex;align-items:center;gap:12px;margin-top:22px}
  .avatar{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,#2b5bd7,#22d3ee);display:grid;place-items:center;font-weight:700;font-size:13px;color:#fff}
  .quote__who b{display:block;font-size:13.5px}
  .quote__who span{font-size:12px;color:var(--muted)}
  .stars{color:#fbbf24;font-size:13px;letter-spacing:2px;margin-bottom:14px}

  /* ---------- blog ---------- */
  .post{display:flex;flex-direction:column;padding:0;overflow:hidden;border:1px solid var(--line);border-radius:var(--radius);background:rgba(255,255,255,.02);transition:border-color .2s,transform .2s;color:inherit;text-decoration:none}
  .post:hover{border-color:rgba(79,140,255,.4);transform:translateY(-3px)}
  .post__img{width:100%;height:168px;object-fit:cover;display:block;background:#0d1729}
  .post__body{padding:22px;display:flex;flex-direction:column;gap:12px;flex:1}
  .post time{font-family:var(--mono);font-size:11.5px;color:var(--accent-2);letter-spacing:.08em;text-transform:uppercase}
  .post h3{font-size:17px}
  .post p{color:var(--muted);font-size:13.5px}
  .post .more{color:var(--accent);font-size:13px;font-weight:600;margin-top:auto}

  /* ---------- section foot ---------- */
  .section-foot{margin-top:34px;color:var(--muted);font-size:14.5px}
  .section-foot a{color:var(--accent);font-weight:600}

  /* ---------- courses ---------- */
  .course-card{
    display:flex;flex-direction:column;
    border:1px solid var(--line);border-radius:var(--radius);padding:26px;
    background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.01));
    transition:border-color .2s,transform .2s;
  }
  .course-card:hover{border-color:rgba(79,140,255,.45);transform:translateY(-3px)}
  .course-card__top{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}
  .course-card__price{font-weight:700;font-size:15px;color:var(--text)}
  .tag--accent{background:var(--accent-soft);border-color:rgba(79,140,255,.4);color:#bcd4ff}
  .course-card h3{font-size:19px;margin-bottom:10px}
  .course-card p{color:var(--muted);font-size:14px;flex:1}
  .course-meta{list-style:none;margin:20px 0 22px;padding:0;display:grid;gap:9px}
  .course-meta li{display:flex;align-items:center;gap:9px;color:var(--text-2);font-size:13px}
  .course-meta svg{width:15px;height:15px;color:var(--accent-2);flex:none}
  .course-card__cta{width:100%}

  /* ---------- join ---------- */
  .join-card{
    border:1px solid var(--line);border-radius:var(--radius);padding:32px;
    background:linear-gradient(180deg,var(--surface-2),var(--surface));
  }
  .join-card--instructor{border-color:rgba(79,140,255,.35);background:
    radial-gradient(500px 200px at 90% 0%,rgba(79,140,255,.18),transparent 65%),
    linear-gradient(180deg,var(--surface-2),var(--surface));}
  .join-card h3{font-size:22px;margin:16px 0 10px}
  .join-card p{color:var(--muted);font-size:14.5px;max-width:46ch}
  .join-list{list-style:none;margin:22px 0;padding:0;display:grid;gap:10px}
  .join-list li{display:flex;gap:10px;align-items:flex-start;color:var(--text-2);font-size:14px}
  .join-list li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);margin-top:8px;flex:none}
  .join-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:auto}

  /* ---------- landing popup (Hustle-style) ---------- */
  .popup-mask{
    position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;
    background:rgba(3,6,12,.78);backdrop-filter:blur(6px);padding:24px;
  }
  .popup-mask.is-open{display:flex}
  .popup{
    width:100%;max-width:520px;border-radius:20px;overflow:hidden;position:relative;
    background:
      radial-gradient(500px 220px at 85% 0%,rgba(79,140,255,.3),transparent 65%),
      linear-gradient(180deg,#101d34,#0b1424);
    border:1px solid rgba(79,140,255,.4);
    box-shadow:0 40px 120px -30px rgba(0,0,0,.9);
    padding:42px;
    animation:popIn .28s ease both;
  }
  @keyframes popIn{from{opacity:0;transform:translateY(14px) scale(.98)}to{opacity:1;transform:none}}
  .popup__close{
    position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:9px;
    border:1px solid var(--line);background:rgba(255,255,255,.04);color:var(--muted);
    display:grid;place-items:center;cursor:pointer;
  }
  .popup__close:hover{color:#fff;border-color:var(--line-strong)}
  .popup__close svg{width:15px;height:15px}
  .popup h3{font-size:26px;margin:14px 0 10px}
  .popup p{color:var(--muted);font-size:14.5px;max-width:40ch}
  .popup form{display:flex;gap:10px;margin-top:24px;flex-wrap:wrap}
  .popup input[type=email]{
    flex:1;min-width:200px;height:48px;padding:0 16px;border-radius:12px;
    border:1px solid var(--line-strong);background:rgba(255,255,255,.04);
    color:var(--text);font-family:inherit;font-size:14.5px;outline:none;
  }
  .popup input[type=email]::placeholder{color:#6f819c}
  .popup input[type=email]:focus{border-color:rgba(79,140,255,.7);box-shadow:0 0 0 3px rgba(79,140,255,.15)}
  .popup__note{font-size:12px;color:#6f819c;margin-top:14px}
  .popup__ok{display:none;margin-top:18px;padding:12px 14px;border-radius:10px;background:rgba(52,211,153,.1);border:1px solid rgba(52,211,153,.35);color:#8ff0c8;font-size:13.5px}
  .popup__ok.is-on{display:block}
  .popup__err{display:none;margin-top:14px;padding:12px 14px;border-radius:10px;background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.35);color:#ffb4b4;font-size:13.5px}
  .popup__err.is-on{display:block}
  .hp-field{position:absolute!important;left:-9999px!important;top:auto!important;width:1px!important;height:1px!important;overflow:hidden!important;opacity:0!important;pointer-events:none!important}
  .popup__decline{
    display:block;margin-top:16px;background:none;border:0;padding:0;
    color:#7d8ea8;font-size:12.5px;font-family:inherit;cursor:pointer;text-decoration:underline;
  }
  .popup__decline:hover{color:#fff}
  @media (max-width:560px){ .popup{padding:30px 24px} }

  /* ---------- CTA ---------- */
  .cta{
    position:relative;overflow:hidden;
    border:1px solid rgba(79,140,255,.35);border-radius:22px;padding:56px;
    background:
      radial-gradient(600px 260px at 85% 0%,rgba(79,140,255,.28),transparent 65%),
      radial-gradient(500px 240px at 10% 100%,rgba(34,211,238,.16),transparent 65%),
      linear-gradient(180deg,#0f1c33,#0b1526);
    display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap;
  }
  .cta__photo{
    position:absolute;top:0;right:0;bottom:0;width:46%;height:100%;
    object-fit:cover;opacity:.42;pointer-events:none;
    -webkit-mask-image:linear-gradient(90deg,transparent,#000 45%);
    mask-image:linear-gradient(90deg,transparent,#000 45%);
  }
  .cta > div{position:relative;z-index:2}
  .cta::after{
    content:"";position:absolute;inset:0;pointer-events:none;
    background:linear-gradient(90deg,rgba(11,21,38,0) 30%,rgba(11,21,38,.5) 100%);
  }
  .cta h2{font-size:clamp(26px,3vw,36px);max-width:22ch}
  .cta p{color:var(--muted);margin-top:12px;max-width:48ch}

  /* ---------- footer ---------- */
  footer{border-top:1px solid var(--line);padding:64px 0 32px;margin-top:40px;background:rgba(4,7,13,.6)}
  .foot{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
  .foot p{color:var(--muted);font-size:14px;margin-top:16px;max-width:34ch}
  .foot h3{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:0 0 16px;font-weight:600}
  .foot ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
  .foot a{color:var(--text-2);font-size:14px}
  .foot a:hover{color:#fff}
  .foot__bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:48px;padding-top:24px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}
  .social{display:flex;gap:10px}
  .social a{width:34px;height:34px;border-radius:9px;border:1px solid var(--line);display:grid;place-items:center;color:var(--muted)}
  .social a:hover{color:#fff;border-color:var(--line-strong)}
  .social svg{width:15px;height:15px}

  /* ---------- reveal ---------- */
  .reveal{opacity:1;transform:none}
  .js .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
  .js .reveal.in{opacity:1;transform:none}

  /* ---------- responsive ---------- */
  @media (max-width:1024px){
    .hero__grid{grid-template-columns:1fr;gap:44px}
    .code-card{transform:none}
    .grid--4{grid-template-columns:repeat(2,1fr)}
    .timeline{grid-template-columns:repeat(2,1fr);gap:26px}
    .timeline::before{display:none}
    .foot{grid-template-columns:1fr 1fr}
    .split{grid-template-columns:1fr;gap:36px}
  }
  @media (max-width:900px){
    .nav__links{display:none}
    .nav__links.open{
      display:flex;position:absolute;top:72px;left:0;right:0;
      flex-direction:column;align-items:flex-start;gap:0;
      background:rgba(8,13,23,.98);border-bottom:1px solid var(--line);padding:12px 24px 20px;
    }
    .nav__links.open a{padding:12px 0;width:100%}
    .nav__links.open .nav__cta{justify-content:center;margin-top:10px;padding:12px 18px}
    .nav__links.open .nav__auth{flex-direction:column;align-items:stretch;gap:0;width:100%;margin:0}
    .nav__links.open .nav__auth a{padding:12px 0;width:100%}
    .nav__toggle{display:grid;place-items:center}
  }
  @media (max-width:760px){
    .section{padding:70px 0}
    .stats{grid-template-columns:1fr 1fr}
    .grid--3,.grid--2{grid-template-columns:1fr}
    .cta{padding:34px}
    .cta__photo{width:100%;opacity:.14}
    .hero{padding-top:56px}
  }
  @media (max-width:520px){
    .code-card pre{white-space:pre-wrap;word-break:break-word}
  }
  @media (prefers-reduced-motion:reduce){
    .reveal{opacity:1;transform:none;transition:none}
    html{scroll-behavior:auto}
  }