:root {
    --ff: "Inter", sans-serif;
    
    /* Type scale */
    --h1: bold 3.5rem/1.2em var(--ff);
    --h2: bold 2rem/1.3em var(--ff);
    --p: 1.25rem/1.6em var(--ff);
    --p2: 1rem/1.6em var(--ff);

    --color-primary: hsl(186, 50%, 90%);
    --color-secondary: hsl(186, 50%, 10%);
    --color-tertiary: hsl(246, 80%, 20%);
    --color-accent: hsl(126, 80%, 20%);

    --color-primary-reverse: hsl(186, 50%, 10%);
    --color-secondary-reverse:hsl(186, 50%, 90%);
    
    /* Spacing */
    --space-md: 2rem;

    --card-border: hsla(126, 80%, 20%, 0.50);
    --card-background-trans: hsla(186, 60%, 90%, 0.75);

    --button-delay: 1.5s;
    --button-size: 4rem;
    --container-width: 800px;
    --button-spacing: 1rem;
    
    /* Animation */
    --fade-duration: 1s;
}

.dark {
  --color-primary: hsl(186, 50%, 10%);
  --color-secondary: hsl(186, 50%, 90%);
  --color-tertiary: hsl(246, 80%, 80%);
  --color-accent: hsl(126, 80%, 80%);
  --card-border: hsla(126, 80%, 80%, 0.50);
  --card-background-trans: hsla(186, 60%, 10%, 0.75);
  --color-primary-reverse: hsl(186, 50%, 90%);
  --color-secondary-reverse:hsl(186, 50%, 10%);
}

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

body {
    background-color: var(--color-primary);
    color: var(--color-secondary);
    font-family: var(--ff);
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 2rem;
    transition: 
      background-color 0.5s ease-in-out,
      color 0.5s ease-in-out;
}

main {
    width: 100%;
    max-width: var(--container-width);
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    /* Remove the centering animation */
    min-height: auto; /* Don't force height */
}

.underline-anim {
    position: relative;
    display: inline-block;
  }
  
.underline-anim::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0.75rem;
    width: 1rem;
    height: 3rem;
    background: linear-gradient(
      to top,
      var(--color-accent) 0%,       /* Glow color */
      var(--color-primary) 100%      /* Background color */
    );
    border-radius: 50%;
    animation: glowGrow 0.8s cubic-bezier(0.65, 0, 0.35, 1) forwards;
    animation-delay: 0.5s;
    z-index: -1;
    filter: blur(2rem);
    transform: scaleY(1.5);               /* More oval shape */
    clip-path: polygon(
      0% 100%,  /* Bottom left */
      100% 100%,  /* Bottom right */
      115% 0%,   /* Top right */
      -15% 0%      
    );
  }
  
.underline-anim::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 0.25rem;
    background-color: var(--color-secondary);
    animation: underlineGrow 0.8s cubic-bezier(0.65, 0, 0.35, 1) forwards;
    animation-delay: 0.5s;
    transition: 
      background-color 0.5s ease-in-out,
      color 0.5s ease-in-out;
  }
  
@keyframes glowGrow {
    to {
      width: 100%;
    }
  }
  
@keyframes underlineGrow {
    to {
      width: 100%;
    }
  }

.hero {
    text-align: left;
    width: 100%;
    padding: var(--space-md);
    opacity: 0;
    animation: 
        fadeIn var(--fade-duration) ease-out forwards,
        moveUp var(--fade-duration) ease-out var(--button-delay) forwards;
    position: relative; /* Needed for z-index */
    z-index: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    font: var(--h1);
    color: var(--color-secondary);
    margin-bottom: 1rem;
}

.subtitle {
    font: var(--p);
    color: var(--color-tertiary);
}

@keyframes moveUp {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(calc(-1 * (var(--button-size) + var(--button-spacing))));
    }
}

.card::after {
  transition: 
    background-color 0.5s ease-in-out,
    color 0.5s ease-in-out;
}

/*-------------------------------Buttons-------------------------------*/

.buttons-container {
  justify-content: center;
  align-items: center;
  display: flex;
  opacity: 0;
  animation: 
      fadeIn var(--fade-duration) ease-out var(--button-delay) forwards,
      enablePointerEvents 0.1s ease-out calc(var(--button-delay) + var(--fade-duration)) forwards;
}

.container{
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.container .card{
  --clr: var(--color-accent);
  position: relative;
  width: 180px;
  height: 180px;
  border-radius: 20px;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all 0.3s ease-in-out;
  transform: scale(1);
  cursor: pointer;

  /* Glow + Blurred Border */
  box-shadow: 0 0 0.5rem 0.05rem var(--card-border);
}

.container .card::before{
  content: '';
  position: absolute;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  background: radial-gradient(var(--clr), transparent, transparent);
  width: 400px;
  height: 400px;
  opacity: 0;
  transition: 0.5s, top 0s, left 0s;
}

.container .card:hover{
  box-shadow: none;
  box-shadow: 0 8px 32px 0 var(--color-accent);
  transform: scale(1.05);
}

.container .card:hover::before{
  opacity: 1;
}

.container .card::after{
  content: '';
  position: absolute;
  inset: 2px;
  border-radius: 18px;
  background: var(--card-background-trans);
}

/*-------------------------------Theme Toggle-------------------------------*/

.theme-toggle {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: transparent;
  border: none;
  color: var(--color-secondary);
  cursor: pointer;
  display: grid;
  place-items: center;
  z-index: 100;
  transition: all 0.3s ease-in-out;
}

.theme-toggle:hover {
  transform: scale(1.1);
}

.theme-toggle .material-icons {
  font-size: 1.5rem;
  transition: all 0.3s ease-in-out;
}

.theme-toggle:hover .material-icons {
  transform: scale(1.1);
}

/*-------------------------------Card Content-------------------------------*/

.card {
  cursor: pointer;
  position: relative;
}

.card-content {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  overflow: hidden;
}

.content-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 1.5rem;
  color: var(--color-secondary);
  text-align: center;
  will-change: transform;
  transform-style: preserve-3d;
  transition: 
    background-color 0.5s ease-in-out,
    color 0.5s ease-in-out;
}

.card:hover .content-wrapper {
  transition: transform 0.1s ease-out;
}

.card-content .material-icons {
  font-size: 3.5rem;
  color: var(--color-secondary);
  opacity: 1;
  position: relative;
  transition: 0.5s ease-in-out;
}

.card:hover .material-icons {
  opacity: 0;
  position: absolute;
  transition: 0.5s ease-in-out;
}

.card:hover h3 {
  opacity: 1;
  position: relative;
  transition: 0.3s ease-in-out;
}

.card-content h3 {
  font: var(--h2);
  margin: 0;
  font-weight: 700;
  opacity: 0;
  position: absolute;
  transition: 0.3s ease-in-out;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  :root {
    --h1: bold 2.5rem/1.2em var(--ff);
    --h2: bold 1.5rem/1.3em var(--ff);
    --p: 1rem/1.6em var(--ff);
    --container-width: 100%;
    --button-size: 3rem;
    --button-spacing: 0.5rem;
    --card-size: min(100vw, 200px);
  }

  body {
    padding: 1rem;
    display: flex;
    min-height: 100vh;
  }

  main {
    width: 100%;
    margin-top: 5rem; /* Space for theme toggle */
  }

  .hero {
    padding: 1rem 0;
    text-align: center;
    margin-bottom: 1rem;
    animation: none;
    opacity: 1;
    transform: none;
  }

  .buttons-container {
    width: 100%;
    animation: none;
    opacity: 1;
  }

  .container {
    flex-direction: row; /* Changed back to row for grid layout */
    flex-wrap: wrap; /* Allow wrapping */
    justify-content: center;
    gap: 1rem;
    width: 100%;
    padding: 0.5rem;
  }

  .container .card {
    width: var(--card-size);
    height: var(--card-size); /* Make it square */
    min-height: auto; /* Remove fixed min-height */
    max-width: 100%;
    margin: 0;
    aspect-ratio: 1/1; /* Ensure perfect square */
  }

  /* Make sure content is always visible */
  .content-wrapper {
    width: 100%;
    padding: 1rem;
  }

  .card-content .material-icons,
  .card-content h3 {
    opacity: 1 !important;
    position: relative !important;
  }

  /* Disable complex animations on mobile */
  .container .card::before {
    display: none;
  }
}

/* Smaller phones - single column layout */
@media (max-width: 480px) {
  :root {
    --h1: bold 2rem/1.2em var(--ff);
    --card-size: 60vw; /* Larger cards on very small screens */
  }
  
  .container {
    flex-direction: column;
    align-items: center;
  }
  
  .container .card {
    width: var(--card-size);
    height: var(--card-size);
  }
}