/* ===========================
   GLOBAL STYLE — BART LAB 2025
   =========================== */
:root {
  --primary: #00c3ff;
  --secondary: #ffd700;
  --accent: #ff5f6d;
  --dark: #0b132b;
  --light: #f9fafc;
  --font-thai: 'Kanit', sans-serif;
  --font-en: 'Montserrat', sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-en), var(--font-thai);
  color: #fff;
  background: linear-gradient(120deg, #000428, #004e92);
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

/* ---------------------------
   BACKGROUND ANIMATION (Particle)
----------------------------*/
#bg-animation {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: -1;
  background: radial-gradient(circle at 20% 20%, rgba(255,255,255,0.05), transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(255,255,255,0.05), transparent 50%);
  animation: gradientShift 12s ease-in-out infinite alternate;
}

@keyframes gradientShift {
  0% { background-position: 0 0, 100% 100%; }
  100% { background-position: 100% 100%, 0 0; }
}

/* Floating glowing dots */
body::before {
  content: "";
  position: fixed;
  width: 100%;
  height: 100%;
  background: repeating-radial-gradient(circle at center, rgba(255,255,255,0.07) 0, rgba(255,255,255,0.07) 2px, transparent 3px, transparent 40px);
  animation: pulseDots 10s infinite ease-in-out alternate;
  z-index: -1;
}
@keyframes pulseDots {
  from { opacity: 0.2; transform: scale(1);}
  to { opacity: 0.4; transform: scale(1.05);}
}

/* ---------------------------
   NAVBAR
----------------------------*/
.navbar {
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255,255,255,0.08);
  backdrop-filter: blur(12px);
  padding: 12px 40px;
  z-index: 999;
  transition: all 0.4s ease;
  box-shadow: 0 0 20px rgba(255,255,255,0.1);
}
.navbar.scrolled {
  background: rgba(0,0,0,0.6);
  padding: 8px 32px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 1.3rem;
}
.nav-logo img {
  height: 40px;
  filter: drop-shadow(0 0 6px rgba(255,255,255,0.3));
}
.nav-links {
  list-style: none;
  display: flex;
  gap: 22px;
}
.nav-links a {
  text-decoration: none;
  color: #fff;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: 0.3s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  left: 0;
  bottom: -4px;
  background: linear-gradient(90deg, var(--secondary), var(--primary));
  transition: width 0.3s ease;
}
.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}
.nav-links a:hover {
  color: var(--secondary);
}

/* ---------------------------
   HERO SECTION
----------------------------*/
.hero-section {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: radial-gradient(circle at center, rgba(255,255,255,0.06), transparent 70%);
  color: #fff;
  padding-top: 80px;
}
.glow-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  text-shadow: 0 0 20px rgba(255,255,255,0.4);
  animation: glowText 3s infinite ease-in-out alternate;
}
.glow-title span {
  background: linear-gradient(90deg, #ffd700, #00c3ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
@keyframes glowText {
  from { text-shadow: 0 0 10px #00c3ff; }
  to { text-shadow: 0 0 25px #ffd700; }
}
.hero-sub {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-top: 8px;
}
.btn-hero {
  display: inline-block;
  margin-top: 28px;
  padding: 12px 28px;
  border-radius: 30px;
  font-weight: 600;
  font-size: 1rem;
  color: #000;
  background: linear-gradient(90deg, #ffd700, #00c3ff);
  box-shadow: 0 0 12px rgba(255,255,255,0.3);
  text-decoration: none;
  transition: all 0.3s;
}
.btn-hero:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px #00c3ff;
}

/* ---------------------------
   ABOUT SECTION
----------------------------*/
.about-section {
  background: rgba(255,255,255,0.05);
  text-align: center;
  padding: 100px 20px 60px;
  backdrop-filter: blur(8px);
}
.about-section h2 {
  font-size: 2.2rem;
  color: var(--secondary);
  margin-bottom: 18px;
  text-transform: uppercase;
}
.about-section p {
  max-width: 800px;
  margin: auto;
  font-size: 1.1rem;
  line-height: 1.8;
  color: #eee;
}

/* ---------------------------
   GRID SECTION
----------------------------*/
.grid-section {
  padding: 60px 40px 80px;
}
.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 28px;
}
.card {
  background: rgba(255,255,255,0.08);
  border-radius: 18px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  overflow: hidden;
  transform-style: preserve-3d;
  transition: all 0.4s ease;
}
.card:hover {
  transform: translateY(-10px) scale(1.03);
  box-shadow: 0 0 25px rgba(255,255,255,0.2);
}
.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.card-content {
  padding: 20px;
  text-align: center;
}
.card-content h3 {
  color: var(--secondary);
  font-size: 1.4rem;
  margin-bottom: 10px;
}
.card-content p {
  font-size: 1rem;
  color: #ddd;
  line-height: 1.5;
  margin-bottom: 16px;
}
.btn-more {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  color: #fff;
  border: none;
  border-radius: 20px;
  padding: 8px 18px;
  text-decoration: none;
  transition: all 0.3s;
  font-weight: 600;
}
.btn-more:hover {
  box-shadow: 0 0 15px var(--primary);
  transform: scale(1.05);
}

/* ---------------------------
   QUOTE SECTION
----------------------------*/
.quote-section {
  padding: 80px 20px;
  text-align: center;
  background: rgba(255,255,255,0.03);
  font-style: italic;
  color: #ddd;
}
.quote-section i {
  font-size: 1.8rem;
  color: var(--secondary);
}
.quote-section blockquote {
  max-width: 700px;
  margin: 0 auto;
}
.quote-section p {
  font-size: 1.2rem;
  line-height: 1.7;
  margin: 20px 0;
}
.quote-section cite {
  display: block;
  color: var(--secondary);
  font-style: normal;
  margin-top: 10px;
  font-weight: 600;
}

/* ---------------------------
   FOOTER
----------------------------*/
.footer {
  background: linear-gradient(90deg, #00c3ff, #ffd700);
  color: #000;
  text-align: center;
  padding: 20px 10px;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

/* ---------------------------
   FLOATING SOCIAL BAR
----------------------------*/
.social-sidebar {
  position: fixed;
  top: 50%;
  right: 18px;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 1000;
}
.social-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.2rem;
  text-decoration: none;
  transition: all 0.3s ease;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(5px);
}
.social-icon:hover {
  transform: scale(1.1) rotate(10deg);
}
.social-icon.fb:hover { background: #1877f2; }
.social-icon.ig:hover { background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fd5949 45%,#d6249f 60%,#285AEB 90%); }
.social-icon.yt:hover { background: #ff0000; }
.social-icon.mail:hover { background: #ffd700; color: #000; }

/* ---------------------------
   RESPONSIVE
----------------------------*/
@media (max-width: 800px) {
  .hero-section h1 { font-size: 2.2rem; }
  .about-section { padding: 80px 20px; }
  .navbar { flex-direction: column; }
  .nav-links { margin-top: 10px; flex-wrap: wrap; justify-content: center; }
  .nav-links a { padding: 4px 8px; }
  .social-sidebar { right: 6px; }
}