/* General Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html,
body {
  overflow-x: hidden;
}
body {
  font-family: "Sarabun", "Inter", sans-serif;
  line-height: 1.8;
  background-color: #fcfdfe;
  font-size: 16px;
  color: #1e293b;
}

/* Premium Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 5px;
  border: 2px solid #f1f5f9;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-blue);
}
:root {
  --primary-blue: #1e3a8a;
  --secondary-blue: #3b82f6;
  --primary-orange: #ea580c;
  --secondary-orange: #fb923c;
  --accent-gold: #f59e0b;
  --white: #ffffff;
  --light-gray: #f8fafc;
  --medium-gray: #e2e8f0;
  --dark-gray: #374151;
  --text-dark: #1f2937;
  --border-light: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}
a {
  text-decoration: none;
  color: inherit;
}
.mobile-break {
  display: none;
}

/* Header & Navbar */
.header {
  background: linear-gradient(
    135deg,
    var(--primary-blue) 0%,
    var(--secondary-blue) 100%
  );
  color: white;
  box-shadow: var(--shadow-lg);
}
.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  gap: 20px;
  flex-wrap: wrap;
}
.logo-section {
  display: flex;
  align-items: center;
  gap: 20px;
}
.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.logo img {
  height: 70px;
  width: auto;
}
.school-info h1 {
  font-size: 24px;
  margin-bottom: 5px;
  color: var(--accent-gold);
  font-weight: 600;
}
.school-info p {
  font-size: 16px;
  opacity: 0.95;
}
.navbar {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}
.nav-container {
  display: flex;
  justify-content: center;
  align-items: center;
}
.mobile-menu-toggle {
  display: none;
}
.nav-menu {
  display: flex;
  list-style: none;
  gap: 0;
  margin: 0;
}
.nav-item a {
  display: block;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
  padding: 18px 24px;
  transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
  border-bottom: 3px solid transparent;
  font-size: 15px;
  letter-spacing: 0.2px;
}
.nav-item a:hover {
  color: var(--primary-blue);
  background-color: rgba(30, 58, 138, 0.03);
}
.nav-item a.active {
  color: var(--primary-blue);
  background-color: rgba(30, 58, 138, 0.05);
  border-bottom-color: var(--primary-blue);
}

/* Reveal Animation Classes */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}
.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: all 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}
.reveal-left.active {
  opacity: 1;
  transform: translateX(0);
}

/* Floating Contact Button */
.floating-contact {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.floating-btn {
  width: 55px;
  height: 55px;
  background: var(--primary-blue);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(30, 58, 138, 0.3);
  cursor: pointer;
  transition: 0.3s;
  text-decoration: none;
  font-size: 24px;
}
.floating-btn:hover {
  transform: scale(1.1) rotate(5deg);
  background: var(--primary-orange);
}

/* Page Header */
.page-header {
  background-color: var(--light-gray);
  padding: 40px 0;
  text-align: center;
  border-bottom: 1px solid var(--border-light);
}
.page-header h1 {
  font-size: 42px;
  color: var(--primary-blue);
  font-weight: 700;
}
.page-header p {
  font-size: 18px;
  color: var(--dark-gray);
  margin-top: 10px;
}

/* Section & Common Components */
.section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 60px;
}
.section-title h2 {
  font-size: 36px;
  color: var(--primary-blue);
  margin-bottom: 16px;
  font-weight: 700;
}
.section-title p {
  color: var(--dark-gray);
  font-size: 18px;
  max-width: 600px;
  margin: 0 auto;
}
.grid {
  display: grid;
  gap: 30px;
}
.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}
.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* Footer Refined */
.footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 70px 0 20px;
  font-size: 15px;
}
.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 60px;
  margin-bottom: 50px;
}
.footer-brand .footer-logo {
  height: 60px;
  margin-bottom: 20px;
  filter: brightness(0) invert(1);
  opacity: 0.9;
}
.footer-brand h3 {
  color: var(--white);
  font-size: 20px;
  margin-bottom: 5px;
  font-weight: 600;
}
.footer-brand .en-name {
  font-size: 14px;
  margin-bottom: 20px;
  opacity: 0.8;
}
.contact-info p {
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  line-height: 1.6;
}
.contact-info .icon {
  display: inline-block;
  min-width: 20px;
}
.contact-info a {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color 0.3s;
}
.contact-info a:hover {
  color: var(--primary-orange);
}

.footer-links-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.footer-section h4 {
  color: var(--white);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 25px;
  position: relative;
  padding-bottom: 10px;
}
.footer-section h4::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background: var(--primary-orange);
  border-radius: 2px;
}
.footer-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-section li {
  margin-bottom: 15px;
}
.footer-section a {
  color: #94a3b8;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-block;
}
.footer-section a:hover {
  color: var(--accent-gold);
  transform: translateX(5px);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0.8;
  font-size: 14px;
}

@media (max-width: 768px) {
  .logo img {
    height: 50px;
  }
  .school-info h1 {
    font-size: 18px;
    line-height: 1.4;
  }
  .school-info p {
    font-size: 13px;
  }
  .mobile-break {
    display: block;
  }

  /* Mobile Dropdown Navigation Menu */
  .mobile-menu-toggle {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--white);
    color: var(--primary-blue);
    font-size: 18px;
    font-weight: 700;
    border: none;
    border-bottom: 2px solid var(--border-light);
    text-align: center;
    cursor: pointer;
  }

  .nav-container {
    flex-direction: column;
    padding: 0;
  }

  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--light-gray);
    padding: 0;
  }

  .nav-menu.show {
    display: flex;
  }

  .nav-item {
    width: 100%;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-item a {
    padding: 15px 20px;
    font-size: 16px;
    border-bottom: none !important;
  }

  .nav-item a:hover,
  .nav-item a.active {
    background-color: var(--primary-orange);
    color: var(--white);
  }

  .page-header h1 {
    font-size: 32px;
  }
  .footer {
    padding: 50px 0 20px;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-brand h3 {
    font-size: 18px;
  }
  .footer-links-group {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
  .footer-section h4 {
    font-size: 16px;
    margin-bottom: 15px;
  }
  .footer-section li {
    margin-bottom: 12px;
    font-size: 14px;
  }
}