:root {
  --primary: #28eefc;
  --secondary: #23499d;
  --on-primary: #111111;
  --on-secondary: #ffffff;
  --bg: #ffffff;
  --surface: #f5f7fa;
  --light: #eef1f6;
  --dark: #1a1a1a;
  --muted: #5b6472;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--bg);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--dark);
  font-weight: 700;
}

.text-muted {
  color: var(--muted) !important;
}

.bg-dark {
  background-color: var(--dark) !important;
}

.text-white-50 {
  color: rgba(255, 255, 255, 0.7) !important;
}

/* Navbar */
.navbar-brand .logo {
  height: 40px;
  width: auto;
  border-radius: 0;
}

/* Sections */
section {
  padding: 70px 0;
}

@media (max-width: 767.98px) {
  section {
    padding: 40px 0;
  }
}

.bg-surface {
  background-color: var(--surface);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  max-width: 100%;
  padding: 14px 28px;
  margin: 8px 0;
  gap: 8px;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 16px;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  box-sizing: border-box;
  cursor: pointer;
  transition: filter 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.btn-cta {
  background: var(--primary);
  color: var(--on-primary) !important;
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
}
.btn-secondary {
  background: var(--secondary);
  color: var(--on-secondary) !important;
}
.btn-cta:hover, .btn-secondary:hover {
  filter: brightness(0.92);
  box-shadow: 0 8px 20px rgba(0,0,0,0.20);
}

/* Form styling */
.lead-form-card {
  background-color: var(--bg);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.form-control {
  height: 50px;
  border-radius: 8px;
  border: 1px solid var(--light);
  padding: 10px 15px;
  font-size: 16px;
  color: var(--dark);
}

.form-control::placeholder {
  color: var(--muted);
  opacity: 1;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 0.25rem rgba(var(--primary), 0.25);
}

.lead-form-card .btn-cta {
    margin-top: 15px;
}

/* Book Cover */
.book-cover {
  border-radius: 12px;
  max-width: 100%;
  height: auto;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.book-cover:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

/* Cards (What you'll get, What's inside) */
.card {
  border: none;
  border-radius: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  background-color: var(--bg);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.1) !important;
}

.list-group-item.card {
    margin-bottom: 1rem; /* Adjust as needed for spacing */
}

.max-width-500 {
    max-width: 500px;
}

/* Responsive adjustments */
@media (min-width: 992px) {
    .hero .lead-form-card {
        max-width: 400px;
    }
}

@media (max-width: 575.98px) {
    .btn {
        width: 100%;
        display: block;
    }
    .hero .lead-form-card {
        width: 100%;
    }
    .book-cover {
        margin-top: 30px;
    }
    .display-4 {
        font-size: 2.5rem;
    }
    .lead {
        font-size: 1rem;
    }
}