:root {
  --color-primary: #00BCD4;
  --color-secondary: #FF4081;
  --color-accent: #673AB7;
  --font-sans: 'Helvetica Neue', Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: var(--font-sans);
}

body {
  color: #333;
  line-height: 1.6;
  background: #fafbfc;
}

/* ---- HEADER ---- */
header {
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 1rem 2rem;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo-left {
  height: 40px;
  width: auto;
  margin-right: 2rem;
  box-shadow: 0 0 0 1px rgba(103,58,183,.08), 0 8px 18px -8px rgba(80,0,255,.13);
  background: transparent;
  object-fit: contain;
  /* border-radius: 0; <-- not needed */
}

nav {
  display: flex;
  gap: 1.2rem;
}

nav a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 1rem;
  padding: 0.2rem 0.4rem;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--color-secondary);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  padding: 0.7rem 1.2rem;
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  /* border-radius: 0; <-- removed for sharp corners */
  font-weight: 600;
  font-size: 1rem;
  margin-left: 1rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  text-decoration: none;
}
.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
}

/* ---- HERO ---- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: white;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero-text h1 {
  color: black !important;
}


.hero .subtitle {
  font-size: 1.25rem;
  margin-bottom: 2rem;
  color: #e5f5ff;
}
.btn-primary {
  margin-top: 1.5rem;
  padding: 0.75rem 1.5rem;
  background: var(--color-secondary);
  color: white;
  border: none;
  /* border-radius: 0; <-- removed */
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

/* ---- FEATURES (cards) ---- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2rem;
  padding: 3rem 2rem;
}
.card {
  padding: 1.5rem;
  /* border-radius: 0; <-- removed */
  background: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.05);
  transition: transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.11);
}

/* ---- FOOTER ---- */
footer {
  text-align: center;
  padding: 2rem;
  background: #f9f9f9;
  font-size: 0.95rem;
  color: #666;
  margin-top: 2rem;
}

/* ---- RESPONSIVE ---- */
@media (max-width: 700px) {
  header {
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem;
  }
  nav {
    gap: 0.7rem;
  }
  .logo-left {
    height: 32px;
    margin-right: 1rem;
  }
  .hero {
    padding: 2rem 0.5rem;
  }
  .features {
    padding: 1.2rem 0.5rem;
  }
}

.why-causality {
  background: #faf8fe;
  border-left: 5px solid #7d3cff;
  margin: 4rem auto 2rem;
  max-width: 820px;
  padding: 2.2rem 2rem 2rem 2.5rem;
  box-shadow: 0 8px 32px -12px rgba(125,60,255,.09), 0 1.5px 0 #eae6fc;
}
.causality-head h2 {
  margin: 0 0 0.5rem 0;
  font-size: 2.1rem;
  color: #432b82;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
}
.causality-lead {
  font-size: 1.15rem;
  color: #7d3cff;
  margin-bottom: 2.2rem;
}
.causality-points {
  margin: 0 0 2rem 1.4rem;
  padding: 0;
  font-size: 1.08rem;
  color: #432b82;
}
.causality-points li {
  margin-bottom: 1.3rem;
  line-height: 1.55;
  padding-left: 0.3rem;
}
.causality-points strong {
  display: block;
  font-weight: 600;
  color: #222;
}
.causality-points span {
  display: block;
  color: #514587;
  margin-top: 0.18em;
  font-weight: 400;
}
.causality-why-now h3 {
  font-size: 1.13rem;
  margin-bottom: 0.8rem;
  color: #432b82;
  font-weight: 600;
  letter-spacing: 0.2px;
}
.causality-why-now ul {
  list-style-type: disc;
  margin: 0 0 0 1.3rem;
  padding: 0;
  color: #555178;
}
.causality-why-now li {
  margin-bottom: 0.75rem;
  line-height: 1.55;
}
@media (max-width: 700px) {
  .why-causality {
    padding: 1.3rem 0.5rem 1.3rem 1rem;
    margin: 2.5rem 0 1.2rem 0;
  }
  .causality-head h2 { font-size: 1.35rem; }
}