:root {
  --clr-primary-100: hsl(225, 100%, 94%);
  --clr-primary-700: hsl(245, 75%, 52%);
  --clr-primary-700-hover: hsl(245, 75%, 65%);
  --clr-neutral-50: hsl(225, 100%, 98%);
  --clr-neutral-600: hsl(224, 23%, 55%);
  --clr-neutral-950: hsl(223, 47%, 23%);
  --clr-white: #ffffff;
  --ff-sans: 'Red Hat Display', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--ff-sans);
  font-size: 16px;
  background-color: var(--clr-primary-100);
  background-image: url('./images/pattern-background-desktop.svg');
  background-repeat: repeat-x;
  background-position: top center;
  background-size: contain;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
}

.m-none {
  display: none;
}

.d-none {
  display: inline;
}

.card-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.card {
  background-color: var(--clr-white);
  max-width: 450px;
  width: 100%;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(223, 47, 23, 0.08), 0 15px 30px rgba(45, 75, 152, 0.1);
}

.hero-img {
  width: 100%;
  display: block;
}

.card-body {
  padding: 2.8rem 3rem;
  text-align: center;
}

.card-title {
  color: var(--clr-neutral-950);
  font-weight: 900;
  font-size: 1.75rem;
  margin-bottom: 1rem;
}

.card-description {
  color: var(--clr-neutral-600);
  font-weight: 500;
  line-height: 1.6;
  font-size: 16px;
  margin-bottom: 1.75rem;
}

.plan-box {
  background-color: var(--clr-neutral-50);
  border-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.plan-details {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  text-align: left;
}

.plan-icon {
  width: 48px;
  height: 48px;
}

.plan-name {
  display: block;
  font-weight: 900;
  color: var(--clr-neutral-950);
  font-size: 1rem;
  margin-bottom: 0.2rem;
}

.plan-price {
  display: block;
  color: var(--clr-neutral-600);
  font-weight: 500;
  font-size: 0.95rem;
}

.btn-change {
  color: var(--clr-primary-700);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: underline;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.btn-change:hover {
  color: var(--clr-primary-700-hover);
  text-decoration: none;
}

.btn-primary {
  display: block;
  width: 100%;
  background-color: var(--clr-primary-700);
  color: var(--clr-white);
  border: none;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 1rem;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 20px 20px rgba(56, 41, 224, 0.2);
  margin-bottom: 2rem;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background-color: var(--clr-primary-700-hover);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  display: block;
  width: 100%;
  background: transparent;
  border: none;
  color: var(--clr-neutral-600);
  font-family: inherit;
  font-weight: 900;
  font-size: 0.95rem;
  cursor: pointer;
  transition: color 0.2s ease;
}

.btn-secondary:hover {
  color: var(--clr-neutral-950);
}

@media (max-width: 480px) {
  body {
    background-image: url('./images/pattern-background-mobile.svg');
    padding: 1.5rem 1rem;
  }

  .m-none {
    display: none;
  }

  .d-none {
    display: inline;
  }

  .card-body {
    padding: 2rem 1.5rem;
  }

  .card-title {
    font-size: 1.4rem;
  }

  .card-description {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
  }

  .plan-box {
    padding: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .btn-primary {
    margin-bottom: 1.5rem;
  }
}

@media (min-width: 481px) {
  .m-none {
    display: inline;
  }

  .d-none {
    display: none;
  }
}

.attribution { 
  font-size: 0.6875rem; 
  text-align: center; 
  margin-top: 1.5rem;
  color: var(--clr-neutral-600);
}

.attribution a { 
  color: var(--clr-primary-700); 
  font-weight: 700;
  text-decoration: none;
}

.attribution a:hover {
  text-decoration: underline;
}