@font-face {
  font-family: 'SPEEDY';
  src: url('fonts/Speedy.woff2') format('woff2');
  font-weight: normal;
  font-style: normal;
}

/* Base theme */
:root {
  --background-color: #0d0d0d;
  --primary-color: #00ff9d;
  --secondary-color: #00e68a; /* lighter green highlights */
  --text-color: #E8FFE8; /* light text */
  --card-bg-color: rgba(0, 255, 157, 0.05);
  --card-hover-bg-color: rgba(0, 255, 157, 0.1);
  --border-color: #00ff9d;
}

#particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1; /* behind content */
  opacity: 0.9;
}

body {
  background-color: var(--background-color);
  color: var(--primary-color);
  font-family: 'SPEEDY', monospace;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

.sound-toggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  background: rgba(0, 255, 157, 0.15);
  color: var(--primary-color);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  cursor: pointer;
  z-index: 60;
  transition: background 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.sound-toggle:hover {
  background: rgba(0, 255, 157, 0.25);
  transform: translateY(-1px);
  box-shadow: 0 0 8px rgba(0, 255, 157, 0.35);
}

.sound-toggle:focus-visible {
  outline: 2px solid var(--secondary-color);
  outline-offset: 2px;
}

.sound-toggle.is-on {
  background: rgba(0, 255, 157, 0.35);
}

.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.5rem;
  position: relative;
  overflow: visible;
}

h1 {
  font-size: 5rem;
  margin: 0;
  padding: 0;
  text-shadow: 0 0 26px var(--primary-color);
  letter-spacing: 2px;
  animation: breathing-soft 5s ease-in-out infinite;
}

.subtitle-container {
  max-width: 300px;
  margin: 0 auto;
  overflow: hidden;
  white-space: nowrap;
  position: relative;
  -webkit-mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
  mask-image: linear-gradient(to right, transparent 0%, black 10%, black 90%, transparent 100%);
}

.subtitle {
  font-size: 1rem;
  opacity: 0.8;
  margin-top: 1.5rem;
  display: inline-block;
  padding-left: 100%;
  text-shadow: 0 0 12px var(--primary-color);
  animation: scroll-left 15s linear infinite, breathing-subtle 8s ease-in-out infinite;
}

/* Link grid */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
}

.link-card {
  border: 1px solid var(--border-color);
  background-color: var(--card-bg-color);
  padding: 1.5rem;
  border-radius: 5px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.link-card:hover {
  background-color: var(--card-hover-bg-color);
  transform: translateY(-5px);
  box-shadow: 0 0 10px rgba(0, 255, 157, 0.2);
}

.link-card:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background-color: var(--primary-color);
  opacity: 0.7;
}

.link-card a {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 1.1rem;
  display: block;
  font-weight: bold;
}

.link-description {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  opacity: 0.8;
  color: var(--text-color);
}

/* Decorative lines */
.grid-line {
  position: fixed;
  background-color: rgba(0, 255, 157, 0.05);
  z-index: -1;
}

.horizontal {
  height: 1px;
  width: 100%;
  left: 0;
}

.vertical {
  width: 1px;
  height: 100%;
  top: 0;
}

footer {
  margin-top: 4rem;
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.7;
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
}

/* Animations */
@keyframes scroll-left {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-200%); /* adjust based on text length */
  }
}

@keyframes breathing-soft {
  0%, 100% {
    text-shadow: 0 0 26px var(--primary-color);
  }
  50% {
    text-shadow: 0 0 38px var(--primary-color);
  }
}

@keyframes breathing-subtle {
  0%, 100% {
    text-shadow: 0 0 12px var(--primary-color);
  }
  50% {
    text-shadow: 0 0 22px var(--primary-color);
  }
}

/* Typewriter cursor */
.cursor {
  display: inline-block;
  background-color: var(--primary-color);
  margin-left: 2px;
  width: 10px;
  animation: blink 1s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* Scanline overlay */
.scanline {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent, transparent 50%, rgba(0, 255, 157, 0.1) 50%, rgba(0, 255, 157, 0.1));
  background-size: 100% 4px;
  z-index: 50;
  pointer-events: none;
  opacity: 0.7;
}

/* Responsive */
@media (max-width: 767px) {
  .container {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  .link-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) and (max-width: 1024px) {
  .container {
    padding: 1.5rem;
  }
}