/* RESET */
* {
  box-sizing: border-box;
}

/* BODY */
body {
  font-family: Arial, sans-serif;
  background: #0d1117;
  color: #e6edf3;
  margin: 0;
}

/* CONTAINER */
.container {
  width: 90%;
  max-width: 1100px;
  margin: auto;
  padding: 40px 20px 80px;
}

/* HERO */
.hero {
  text-align: center;
  margin-top: 80px;
  margin-bottom: 60px;
}

h1 {
  font-size: 3rem;
  margin-bottom: 10px;
}

h2 {
  color: #c9d1d9;
  margin-bottom: 16px;
}

.subtitle {
  margin-top: 10px;
  color: #8b949e;
}

p {
  margin: 10px 0;
  line-height: 1.7;
}

/* SECTION */
.section {
  margin-top: 60px;
}

/* GRID PROJECTS */
.section:nth-of-type(2) {
  /* About Me giữ nguyên */
}

.section:nth-of-type(3) {
  display: grid;
  grid-template-columns: 1fr;
}

/* PROJECT GRID WRAPPER */
.section:nth-of-type(3) .project {
  width: 100%;
}

/* TẠO GRID CHO PROJECTS */
@media (min-width: 768px) {
  .section:nth-of-type(3) {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .section:nth-of-type(3) h2 {
    grid-column: span 2;
  }
}

/* CARD / PROJECT */
.card,
.project {
  background: linear-gradient(145deg, #161b22, #1c2128);
  padding: 22px;
  margin-top: 20px;
  border-radius: 16px;
  border: 1px solid #21262d;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

/* HOVER EFFECT */
.card:hover,
.project:hover {
  transform: translateY(-8px) scale(1.01);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
  border-color: #30363d;
}

/* GLOW EFFECT */
.project::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent, rgba(88, 166, 255, 0.15), transparent);
  opacity: 0;
  transition: 0.4s;
}

.project:hover::before {
  opacity: 1;
}

/* LINKS */
a {
  color: #58a6ff;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #79c0ff;
  text-decoration: underline;
}

/* HERO LINKS */
.hero-links {
  margin-top: 18px;
}

/* ANIMATION */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease forwards;
}

.delay-1 {
  animation-delay: 0.2s;
}

.delay-2 {
  animation-delay: 0.4s;
}

.delay-3 {
  animation-delay: 0.6s;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}