:root{
  --bg:#f3f6fb;
  --card:#ffffff;
  --muted:#6b7280;
  --accent-1:#06b6d4;
  --accent-2:#7c3aed;
  --accent-grad:linear-gradient(135deg,var(--accent-1),var(--accent-2));
  --text:#071124;
  --soft-shadow: 0 10px 30px rgba(7,17,36,0.08);
  --glass: rgba(255,255,255,0.65);
  --radius:14px;
}

*{box-sizing:border-box}
body{font-family:Inter,system-ui,Segoe UI,Segoe,Arial;line-height:1.6;color:var(--text);background:var(--bg);margin:0}
.container{max-width:1100px;margin:0 auto;padding:1rem}

/* NAV */
.nav{background:transparent;padding:.2rem 0;position:sticky;top:0;z-index:40;backdrop-filter: blur(4px)}
.nav-inner{display:flex;align-items:center;justify-content:space-between}
.brand{font-weight:800;color:var(--accent-2);text-decoration:none;font-size:1.05rem}
.brand{display:flex;align-items:center;gap:.75rem}
/* logo keeps aspect ratio: set height and allow width to scale */
.brand .logo{height:44px;width:auto;max-width:64px;display:block}
.brand .brand-text{font-weight:800;color:var(--accent-2);font-size:1rem}

@media (max-width:540px){
  .brand .logo{height:36px}
  .brand .brand-text{font-size:.95rem}
}
.nav-links{display:flex;gap:1rem;align-items:center}
.nav-links a{color:var(--text);text-decoration:none;padding:.45rem .6rem;border-radius:8px;transition:all .18s}
.nav-links a:hover{background:rgba(124,58,237,0.06)}
.nav-toggle{display:none;background:none;border:0;font-size:1.25rem}

/* HERO */
.hero{padding:2.1rem 0;position:relative;overflow:hidden;background:linear-gradient(180deg,#f6f9fc 0%, #f3f6fb 100%)}
.hero:before{content:'';position:absolute;right:-160px;top:-80px;width:520px;height:520px;background:var(--accent-grad);opacity:.06;border-radius:50%;filter:blur(80px);transform:rotate(18deg)}
h1{font-size:2rem;margin:0 0 .6rem;line-height:1.02}
.lead{color:var(--muted);max-width:60ch;font-size:1.02rem}
.hero-inner{display:grid;grid-template-columns:1fr 560px;gap:2.75rem;align-items:center}
.hero-card{background:linear-gradient(180deg,rgba(255,255,255,0.98),var(--glass));padding:1.5rem;border-radius:16px;box-shadow:var(--soft-shadow);border:1px solid rgba(7,17,36,0.04)}
.hero-ctas{margin-top:1.25rem;display:flex;gap:.75rem}

/* Hero media */
.media-wrap{display:flex;flex-direction:column;gap:1rem;align-items:center}
.hero-media{width:100%;max-width:560px;border-radius:18px;overflow:visible}
.hero-visual{background:var(--card);border-radius:18px;padding:1.25rem;box-shadow:0 40px 80px rgba(7,17,36,0.12);border:1px solid rgba(7,17,36,0.04);overflow:hidden}
.hero-media img{display:block;width:100%;height:460px;object-fit:contain;object-position:right center;vertical-align:middle;border-radius:12px}

/* badges overlay */
.hero-media{position:relative}
.badges{position:absolute;inset:0;pointer-events:none}
.badge{position:absolute;display:inline-block;padding:.45rem .7rem;border-radius:12px;color:white;font-weight:700;box-shadow:0 8px 20px rgba(2,6,23,0.12);pointer-events:auto}
.badge-1{left:8%;top:14%;background:linear-gradient(90deg,#06b6d4,#06b6d4cc)}
.badge-2{right:12%;top:24%;background:linear-gradient(90deg,#7c3aed,#4f46e5)}
.badge-3{left:18%;bottom:18%;background:linear-gradient(90deg,#06b6d4,#7c3aed)}

/* make hero-card overlap under the image like example */
.hero-card{margin-top:-14px}

/* SECTIONS */
.section{padding:3rem 0}

/* Reduce vertical gap specifically for Topics section */
section#topics{padding-top:1.25rem;padding-bottom:2rem}
.section.alt{background:linear-gradient(180deg,#fff,#fbfdff)}
.small{padding:2rem 0}

.grid{display:grid;gap:1rem}
.topics-grid{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);padding:1.1rem;border-radius:12px;box-shadow:0 8px 22px rgba(15,23,42,0.06);font-weight:700;color:var(--accent-2);border-left:4px solid rgba(124,58,237,0.12)}

/* Topic cards (example style) */
.topic-card{background:linear-gradient(135deg,#06b6d4 0%,#4f46e5 100%);color:white;padding:1.4rem;border-radius:14px;min-height:240px;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden;transition:transform .28s cubic-bezier(.2,.9,.2,1),box-shadow .28s,cursor .1s}
.topic-card:hover{transform:translateY(-10px) scale(1.02);box-shadow:0 22px 46px rgba(15,23,42,0.18)}
.topic-top{display:flex;gap:1rem;align-items:center}
.topic-ill{width:56px;height:56px;border-radius:10px;flex:0 0 56px;transition:transform .28s}
.topic-card:hover .topic-ill{transform:scale(1.06)}
.topic-card h3{margin:0;font-size:1.1rem}
.topic-card p{margin:.75rem 0 .9rem;color:rgba(255,255,255,0.95);line-height:1.45}
.topic-cta{display:inline-block;background:white;color:var(--accent-2);padding:.8rem 1.4rem;border-radius:40px;font-weight:700;border:0;box-shadow:none;transition:transform .18s,box-shadow .18s; text-align:center}
.topic-cta:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(15,23,42,0.12)}
.topic-card::after{content:'';position:absolute;right:-80px;bottom:-40px;width:200px;height:200px;background:rgba(255,255,255,0.06);border-radius:50%;transform:rotate(15deg);transition:opacity .3s,transform .3s}
.topic-card:hover::after{transform:translateX(8px) rotate(12deg);opacity:0.9}


.learn-grid{grid-template-columns:2fr 1fr;align-items:center}
.learn-cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
.learn-card{display:flex;gap:1rem;align-items:flex-start;background:linear-gradient(180deg,white,rgba(249,250,255,0.9));padding:1rem;border-radius:12px;box-shadow:var(--soft-shadow)}
.learn-icon{flex:0 0 56px;height:56px;border-radius:12px;background:var(--accent-grad);color:white;display:flex;align-items:center;justify-content:center;font-weight:700}
.learn-card strong{display:block;font-size:1rem;margin-bottom:.25rem}
.learn-card .muted{font-size:.95rem;color:var(--muted)}

/* Learn CTA: integrate visually with cards and allow media */
.learn-cta{background:linear-gradient(90deg,rgba(6,182,212,0.06),rgba(124,58,237,0.04));border-radius:14px;border:1px solid rgba(7,17,36,0.04);padding:1rem;display:flex;flex-direction:column;justify-content:space-between;gap:1rem}
.learn-cta-inner{padding-right:0}
.learn-cta-media{display:block;text-align:center}
.learn-cta-media img{max-width:160px;height:auto;border-radius:10px;box-shadow:0 20px 40px rgba(7,17,36,0.08)}

@media (min-width:1100px){
  .learn-grid{grid-template-columns:2fr 360px}
  .learn-cards{grid-template-columns:repeat(2,1fr)}
  /* keep image stacked above text even on wide screens */
  .learn-cta{padding:1.6rem;flex-direction:column;align-items:flex-start}
  .learn-cta-media{width:100%;display:flex;justify-content:flex-start}
  .learn-cta-media img{max-width:260px;margin-bottom:.6rem}
  .learn-cta-inner{padding-left:0}
}

@media (max-width:920px){
  .learn-grid{grid-template-columns:1fr}
  .learn-cta{order:2}
  .learn-cards{order:1}
  .learn-cta-media img{max-width:180px;margin:0 auto}
}

.learn-list ol{padding-left:1.25rem}
.learn-cta{padding:1.25rem;background:linear-gradient(90deg,rgba(6,182,212,0.06),rgba(124,58,237,0.04));border-radius:12px;border:1px solid rgba(7,17,36,0.04)}

.features{grid-template-columns:repeat(3,1fr)}
.feature{background:linear-gradient(180deg,white,rgba(249,250,255,0.7));padding:1.25rem;border-radius:12px;text-align:center;box-shadow:var(--soft-shadow)}

.footer{padding:1.25rem 0;color:var(--muted)}
.footer-inner{display:flex;justify-content:space-between;align-items:center}

.muted{color:var(--muted)}

/* Buttons */
.btn{display:inline-block;padding:.65rem 1rem;border-radius:12px;text-decoration:none;border:1px solid transparent;font-weight:600;transition:all .18s}
.btn.primary{background:var(--accent-grad);color:white;box-shadow:0 8px 20px rgba(124,58,237,0.12)}
.btn.primary:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(124,58,237,0.16)}
.btn.ghost{background:transparent;border:1px solid rgba(7,17,36,0.06);color:var(--text)}

/* Responsive */
@media (max-width:920px){
  .hero-inner{grid-template-columns:1fr}
  .topics-grid{grid-template-columns:repeat(2,1fr)}
  .nav-toggle{display:block}
  .nav-links{position:absolute;right:1rem;top:64px;background:var(--card);padding:.75rem;border-radius:12px;box-shadow:var(--soft-shadow);display:none;flex-direction:column}
  .nav-links a{padding:.5rem 0}
  .hero-media{max-width:420px}
  .hero-ctas{justify-content:center}
  /* Make learn-cards single-column on narrower screens */
  .learn-cards{grid-template-columns:1fr}
}
@media (max-width:540px){
  .topics-grid{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .learn-grid{grid-template-columns:1fr}
  h1{font-size:1.6rem}
  .hero-ctas{flex-direction:column;align-items:center}
  .hero-ctas .btn{width:88%;max-width:360px;text-align:center}
  /* center topic card content on small screens */
  .topic-card{align-items:center;text-align:center;padding:1.6rem}
  .topic-top{flex-direction:column;align-items:center;gap:.6rem}
  .topic-ill{margin:0 auto}
  .topic-cta{width:90%;max-width:340px;margin:0 auto}
  /* Hide CTA illustration on small screens for cleaner layout */
  .learn-cta-media{display:none}
}

/* subtle utilities */
.fade-in{animation:fadeIn .6s ease both}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}