body, html {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: 'Montserrat', sans-serif;
  color: #e6e6e6;
  background: #181a20;
  overflow-x: hidden;
  padding-top: 90px; /* Để tránh nội dung bị che bởi header */
}
#bg-canvas {
  position: fixed;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  top: 0;
  left: 0;
  pointer-events: none;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 32px 8vw 0 8vw;
  background: rgba(24,26,32,0.92);
  z-index: 100;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  box-sizing: border-box;
  box-shadow: 0 2px 16px #0004;
  transition: background 0.3s, box-shadow 0.3s;
  backdrop-filter: blur(8px);
}
.logo {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 2px;
  color: #00e0d6;
  font-family: 'Dancing Script', cursive;
}
nav {
  display: flex;
  gap: 20px;
}
nav a {
  color: #e6e6e6;
  text-decoration: none;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 20px;
  border: 1.5px solid #00e0d6;
  transition: background 0.2s, color 0.2s;
}
nav a:hover {
  background: #00e0d6;
  color: #181a20;
}

/* HERO SECTION */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-top: -100px;
  text-align: center;
  position: relative;
  z-index: 2;
  padding: 32px 24px 40px 24px;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
  background: none !important;
  border: none !important;
  box-shadow: none !important;
  border-radius: 0 !important;
  backdrop-filter: none !important;
  transition: none !important;
}
.avatar-border {
  background: linear-gradient(135deg, #00e0d6, #a259ff, hsl(182, 88%, 68%), #00e0d6);
  background-size: 300% 300%;
  animation: gradient-rotate 4s linear infinite;
  padding: 7px;
  border-radius: 50%;
  display: inline-block;
  margin-bottom: 24px;
  box-shadow: 0 0 32px 0 #00e0d633;
}
@keyframes gradient-rotate {
  0% { background-position: 0% 50%;}
  50% { background-position: 100% 50%;}
  100% { background-position: 0% 50%;}
}
.avatar {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid #181a20;
  background: #222;
}
.hero-title {
  font-size: 2.2rem;
  font-weight: 700;
  margin: 0 0 18px 0;
  color: #00e0d6;
  line-height: 1.3;
  letter-spacing: 0.2px;
  text-align: center;
}
.hero-title .highlight {
  color: #a259ff;
  font-weight: 700px;
  letter-spacing: 0.5px;
}
.desc, .hero-desc {
  font-size: 1.1rem;
  color: #e6e6e6;
  margin-bottom: 40px;
  max-width: 900px;
  text-align: justify;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}
.desc p, .hero-desc p {
  margin: 0 0 12px 0;
  font-weight: 400;
}
.desc p:last-child, .hero-desc p:last-child {
  margin-bottom: 0;
}
.buttons {
  display: flex;
  gap: 16px;
  margin-bottom: 32px;
  justify-content: center;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}
.btn {
  background: linear-gradient(135deg, #00e0d6, #a259ff, hsl(182, 88%, 68%), #00e0d6);
  color: #000000;
  padding: 12px 32px;
  border-radius: 32px;
  font-weight: 700;
  text-decoration: none;
  font-size: 1rem;
  border: none;
  transition: background 0.2s, color 0.2s;
  box-shadow: 0 2px 8px #00e0d633;
}
.btn:hover {
  background: linear-gradient(135deg, #00e0d6, hsl(182, 88%, 68%), #a259ff, #00e0d6);
  color: #fff;
}
.btn-outline {
  background: transparent;
  border: 2px solid #00e0d6;
  color: #00e0d6;
}
.btn-outline:hover {
  background: linear-gradient(135deg, #00e0d6, hsl(182, 88%, 68%), #a259ff, #00e0d6);;
  color: #181a20;
}
.tech-stack {
  margin-top: 36px;
  color: #00e0d6;
  font-size: 1.3rem;
  font-family: 'Montserrat', sans-serif;
  letter-spacing: 2px;
}
.tech-stack .icons {
  margin-top: 12px;
  display: flex;
  gap: 24px;
  justify-content: center;
}
.tech-stack img {
  width: 74px;
  height: 74px;
  filter: drop-shadow(0 2px 8px #00e0d655);
  transition: transform 0.2s;
}
.tech-stack img:hover {
  transform: scale(1.15) rotate(-5deg);
}
.card-section {
  max-width: 800px;
  margin: 48px auto 0 auto;
  padding: 0 24px;
}
.card-section h2 {
  color: #00e0d6;
  font-size: 1.3rem;
  margin-bottom: 24px;
  font-weight: 700;
}
.card {
  background: rgba(34,36,42,0.95);
  border-radius: 18px;
  box-shadow: 0 2px 16px #0004;
  padding: 24px 32px;
  margin-bottom: 24px;
  color: #e6e6e6;
}
.card h3 {
  margin-top: 0;
  color: #a259ff;
}
.card ul {
  margin: 0 0 0 18px;
  padding: 0;
}
.card p {
  margin: 8px 0;
}
@media (max-width: 700px) {
  header {
    flex-direction: column;
    gap: 16px;
    padding: 24px 4vw 0 4vw;
  }
  .hero, .card-section {
    margin-top: 24px;
    padding: 16px 4vw;
  }
  .hero-title {
    font-size: 1.3rem;
  }
  .desc, .hero-desc {
    font-size: 1rem;
    max-width: 95vw;
  }
  .card {
    padding: 16px 8px;
  }
}

footer {
  width: 100%;
  background: rgba(24,26,32,0.95);
  color: #e6e6e6;
  text-align: center;
  padding: 18px 0 12px 0;
  position: relative;
  bottom: 0;
  font-size: 1rem;
  z-index: 2;
  margin-top: 48px;
}
.footer-content {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.footer-content a {
  display: inline-block;
  margin: 0 4px;
  vertical-align: middle;
  transition: transform 0.2s;
}
.footer-content a:hover {
  transform: scale(1.2);
}
.footer-content img {
  vertical-align: middle;
  filter: drop-shadow(0 0 2px #00e0d6);
}

.project-slider {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  max-width: 700px;
  margin: 0 auto 32px auto;
  min-height: 220px;
}
.slider-viewport {
  width: 100%;
  max-width: 500px;
  overflow: hidden;
  border-radius: 18px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
}
.slider-track {
  display: flex;
  transition: transform 0.5s cubic-bezier(.77,0,.18,1);
  will-change: transform;
  width: 100%;
}
.project-card {
  min-width: 100%;
  max-width: 100%;
  background: rgba(34,36,42,0.95);
  border-radius: 18px;
  color: #e6e6e6;
  padding: 24px 32px;
  box-sizing: border-box;
  text-align: left;
  margin: 0;
  box-shadow: none;
}
.slider-btn {
  background: none;
  border: none;
  color: #00e0d6;
  font-size: 2.2rem;
  cursor: pointer;
  padding: 0 12px;
  transition: color 0.2s;
  z-index: 2;
  user-select: none;
  height: 100%;
  display: flex;
  align-items: center;
}
.slider-btn.next { color: #a259ff; }
.slider-btn.prev { color: #00e0d6; }
.slider-btn:active { transform: scale(1.2); }
@media (max-width: 700px) {
  .slider-viewport {
    max-width: 95vw;
  }
  .project-card {
    padding: 16px 8px;
    font-size: 0.95rem;
  }
  .project-slider {
    min-height: 180px;
  }
}

/* Phần tiêu đề dự án */
.project-card h3 {
  font-family: 'Montserrat', 'Roboto', Arial, sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: none;
  color: #fff;
  margin-bottom: 12px;
}
/* Phần mô tả, danh sách */
.project-card ul, .project-card p {
  font-family: 'Montserrat', 'Roboto', Arial, sans-serif;
  font-size: 1.05rem;
  font-weight: 400;
  color: #e6e6e6;
  line-height: 1.7;
  margin-bottom: 0;
  margin-top: 0;
  letter-spacing: 0.1px;
}
/* Nếu có link trong project */
.project-card a {
  font-family: 'Montserrat', 'Roboto', Arial, sans-serif;
  font-size: 1rem;
  color: #00e0d6;
  text-decoration: underline;
  font-weight: 500;
  transition: color 0.2s;
}
.project-card a:hover {
  color: #a259ff;
}

.hero-title, h1 {
  font-family: 'Montserrat', Arial, sans-serif;
  font-weight: 900;
  font-size: 2.2rem;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: #00e0d6;
  margin: 0 0 24px 0;
  text-align: center;
}
.desc, .diamond, .hero-desc {
  font-family: 'Fira Sans', 'Inter', 'Montserrat', Arial, sans-serif;
  font-size: 1.13rem;
  color: #e6e6e6;
  line-height: 1.7;
  text-align: justify;
  margin-bottom: 40px;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.diamond {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 32px;
  margin-left: auto;
  margin-right: auto;
  max-width: 900px;
}
.diamond-top, .diamond-bottom {
  text-align: center;
  max-width: 1000px;
  margin: 0 auto 0 auto;
}
.diamond-mid {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 8px auto;
}
/* .diamond-justify {
  text-align: justify;
  max-width: 900px;
  margin: 0 auto 8px auto;
} */
.diamond p {
  color: #e6e6e6;
  font-size: 1.1rem;
  line-height: 1.7;
  padding: 0;
}
.diamond p:last-child {
  margin-bottom: 0;
}

.diamond p, .desc p {
  margin: 0;
  padding: 0;
  line-height: 1.4;      /* hoặc 1.6, 1.8 tuỳ ý */
}

.diamond p + p, .desc p + p {
  margin-top: 10px;      /* hoặc 8px, 12px tuỳ ý, tạo khoảng cách đều giữa các dòng */
}