* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: 2rem;
  overflow-x: hidden;
  font-family: "Trebuchet MS", Arial, sans-serif;
  background:
    radial-gradient(circle at top, rgba(125, 211, 252, 0.45), transparent 30%),
    linear-gradient(145deg, #0f172a 0%, #111827 45%, #1e293b 100%);
  color: #e2e8f0;
}

.cursor-halo {
  position: fixed;
  top: 0;
  left: 0;
  width: 18rem;
  height: 18rem;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  transform: translate3d(-50%, -50%, 0);
  background:
    radial-gradient(
      circle,
      rgba(125, 211, 252, 0.26) 0%,
      rgba(96, 165, 250, 0.18) 35%,
      rgba(59, 130, 246, 0.08) 55%,
      transparent 72%
    );
  filter: blur(16px);
  transition: opacity 180ms ease;
  z-index: 0;
}

.cursor-halo.is-visible {
  opacity: 1;
}

.hero {
  width: min(92vw, 52rem);
  margin: 0 auto;
  position: relative;
  z-index: 1;
  padding: 3rem;
  border-radius: 1.5rem;
  text-align: left;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(148, 163, 184, 0.2);
  box-shadow: 0 30px 80px rgba(2, 6, 23, 0.45);
  backdrop-filter: blur(10px);
}

.eyebrow {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #7dd3fc;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.6rem, 7vw, 4.75rem);
  line-height: 0.95;
}

.subtitle {
  max-width: 38rem;
  margin: 0 0 2rem;
  font-size: 1.1rem;
  line-height: 1.6;
  color: #cbd5e1;
}

.skills {
  display: grid;
  gap: 1rem;
}

.skill-card {
  overflow: hidden;
  border: 1px solid rgba(125, 211, 252, 0.2);
  border-radius: 1rem;
  background: rgba(30, 41, 59, 0.75);
}

summary {
  list-style: none;
  padding: 1.1rem 1.25rem;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  color: #f8fafc;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  float: right;
  color: #7dd3fc;
  font-size: 1.4rem;
  line-height: 1;
}

details[open] summary::after {
  content: "-";
}

.skill-content {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
}

.skill-content p {
  margin: 1rem 0 0;
  line-height: 1.7;
  color: #cbd5e1;
}

@media (max-width: 640px) {
  body {
    padding: 1rem;
  }

  .cursor-halo {
    display: none;
  }

  .hero {
    padding: 1.5rem;
  }
}