/* ============================================
   IMPORTS
   External resources loaded first
   ============================================ */

@import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;700&display=swap");


/* ============================================
   CSS RESET & NORMALIZATION
   Ensures consistent behavior across browsers
   ============================================ */

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

html {
  /* Prevent horizontal overflow */
  overflow-x: hidden;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  min-height: 100vh;
}

ul {
  list-style: none;
}


/* ============================================
   BASE STYLES
   Default typography and layout
   ============================================ */

body {
  display: grid;
  place-items: center;
  min-height: 100%;
  font-family: "Montserrat", system-ui, -apple-system, sans-serif;
  font-size: 1.1rem;
  line-height: 1.6;
  background-color: var(--color-bg-dark);
  color: var(--text-color);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}


/* ============================================
   LAYOUT CONTAINER
   Main content wrapper
   ============================================ */

.main {
  max-width: 75rem;
  width: 100%;
  margin: 0 auto;
}


/* ============================================
   TYPOGRAPHY
   Heading and text styles
   ============================================ */

.main__heading {
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 2.75rem);
  margin-bottom: 0.75em;
  text-align: center;
  
  /* Gradient text effect */
  background: linear-gradient(
    to right,
    var(--heading-gradient-start),
    var(--heading-gradient-end)
  );
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}


/* ============================================
   SECTIONS
   Common section styles
   ============================================ */

.hero,
.projects,
.about,
.contact,
.skillset {
  text-align: center;
  padding: 5rem 1.25rem;
  background: transparent;
}


/* ============================================
   BACKGROUND EFFECTS
   Particle.js canvas
   ============================================ */

#particles-js {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 120%;
  z-index: -1;
  pointer-events: none;
}


/* ============================================
   BUTTONS
   Primary call-to-action button
   ============================================ */

.cta-btn {
  /* Layout */
  display: inline-block;
  padding: 0.9375rem 2.1875rem;
  margin-bottom: 0.625rem;
  
  /* Typography */
  color: var(--btn-text-color);
  font-size: 1.25rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.125rem;
  text-decoration: none;
  text-align: center;
  vertical-align: middle;
  
  /* Visual */
  background: var(--btn-bg);
  border: none;
  border-radius: 1.25rem;
  cursor: pointer;
  
  /* Animation */
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.cta-btn:hover,
.cta-btn:focus {
  background-color: var(--btn-hover-bg);
  color: var(--btn-hover-color);
  transform: translateY(-0.3125rem);
  box-shadow: 
    0 0 1.25rem var(--btn-shadow),
    0 0 2.5rem var(--btn-shadow-strong);
}

.cta-btn:active {
  transform: translateY(-0.125rem);
}


/* ============================================
   OVERLAY EFFECTS
   Hover mask for card interactions
   ============================================ */

.overlay {
  /* Radial mask effect */
  -webkit-mask: radial-gradient(
    20rem 20rem at var(--x) var(--y),
    #000 1%,
    transparent 50%
  );
  mask: radial-gradient(
    20rem 20rem at var(--x) var(--y),
    #000 1%,
    transparent 50%
  );
}


/* ============================================
   PROJECT GRID
   Project showcase layout
   ============================================ */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: 2rem;
  align-items: start;
}


/* ============================================
   RESPONSIVE DESIGN
   Tablet and mobile optimizations
   ============================================ */

/* Tablet: 768px - 1024px */
@media (max-width: 64rem) {
  body {
    font-size: 1rem;
  }

  .hero,
  .projects,
  .about,
  .contact,
  .skillset {
    padding: 3.75rem 0.9375rem;
  }

  .main__heading {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }

  .cta-btn {
    padding: 0.625rem 1.25rem;
    font-size: 1.125rem;
    letter-spacing: 0.0625rem;
  }

  /* Adjust overlay mask for tablet */
  .overlay {
    -webkit-mask: radial-gradient(
      15rem 15rem at var(--x) var(--y),
      #000 1%,
      transparent 50%
    );
    mask: radial-gradient(
      15rem 15rem at var(--x) var(--y),
      #000 1%,
      transparent 50%
    );
  }

  /* Disable hover transforms on tablet */
  :not(.overlay) > .card:hover {
    transform: none;
  }

  /* Project grid - single column on tablet */
  .projects-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* Mobile: up to 768px */
@media (max-width: 48rem) {
  h2 {
    font-size: 1.5rem;
  }

  /* Smaller overlay mask for mobile touch */
  .overlay {
    -webkit-mask: radial-gradient(
      12rem 12rem at var(--x) var(--y),
      #000 1%,
      transparent 50%
    );
    mask: radial-gradient(
      12rem 12rem at var(--x) var(--y),
      #000 1%,
      transparent 50%
    );
  }
}

/* Small mobile: up to 375px */
@media (max-width: 23.4375rem) {
  body {
    font-size: 0.9375rem;
  }

  .main__heading {
    font-size: 1.5rem;
  }

  .cta-btn {
    padding: 0.5rem 1rem;
    font-size: 1rem;
  }
}