* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #e8f4ff, #ffffff);
  color: #222;
  overflow-x: hidden;
  line-height: 1.7;
}

section, header {
  animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ================= HERO ================= */
.hero-section {
  height: 80vh;
  background: linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
              url('background_photos/campus1.jpg');
  background-size: cover;
  background-position: center;
  position: relative;
  box-shadow: 0 8px 25px rgba(0,0,0,0.25);
}

.navbar {
  display: flex;
  align-items: center;
  padding: 20px 50px;
  gap: 20px;
  position: relative;
}

.logo-group { display: flex; align-items: center; gap: 15px; }
.logo { width: 110px; }
.logo-label { color: white; font-size: 1.3rem; font-weight: 700; line-height: 1.3rem; }
.logo-label2 { font-size: 1.5rem; font-weight: 800; }

.nav-links {
  list-style: none;
  display: flex;
  gap: 25px;
  margin-left: auto;
}
.nav-links a {
  text-decoration: none;
  color: white;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 6px;
  transition: transform 0.25s ease, background 0.25s ease;
}
.nav-links a:hover {
  background: rgba(255,255,255,0.25);
  transform: scale(1.05);
}
.contact-btn {
  background-color: #014f6e;
  padding: 10px 22px;
  border-radius: 20px;
  font-weight: 700;
}

.hamburger {
  display: none;
  font-size: 2rem;
  color: white;
  cursor: pointer;
  z-index: 50;
}

/* HERO TEXT */
.hero-text-group {
  position: absolute;
  left: 60px;
  bottom: 140px;
}
.button-label {
  color: white;
  font-size: 2.5rem;
  font-weight: 600;
  padding-bottom: 35px;
  transition: transform 0.25s ease;
}
.button-label:hover { transform: scale(1.03); }

.join-btn {
  margin-top: 20px;
  padding: 18px 30px;
  background: white;
  color: black;
  text-decoration: none;
  font-weight: bold;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.25);
  transition: 0.3s ease;
}
.join-btn:hover { background: #0040c1; color: white; transform: translateY(-3px); }

/* ================= INTRODUCTION ================= */
.introduction-wrap,
.announcements-wrap,
.bottom-section {
  display: flex;
  justify-content: center;
  padding: 80px 0;
  text-align: center;
}

#introduction {
  max-width: 1100px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(6px);
  padding: 50px;
  border-radius: 20px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.15);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
#introduction:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 32px rgba(0,0,0,0.18);
}

.motivation {
  color: #014f6e;
  font-size: 50px;
  margin-bottom: 20px;
}

/* ================= ANNOUNCEMENTS ================= */
.announcements-wrap {
  background: #014f6e;
  color: white;
  padding-bottom: 150px;
}
.announcements {
  max-width: 900px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  padding: 40px;
  border-radius: 18px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.2);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
.announcements:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 32px rgba(0,0,0,0.2);
}

/* ================= BOTTOM ================= */
.bottom-container {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  width: 85%;
  max-width: 1100px;
}
.bottom-box {
  flex: 1;
  min-width: 300px;
  background: rgba(255,255,255,0.85);
  padding: 35px;
  border-radius: 18px;
  text-align: left;
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  transition: transform 0.28s ease, box-shadow 0.28s ease;
}
.bottom-box:hover {
  transform: translateY(-6px);
  box-shadow: 0 14px 28px rgba(0,0,0,0.15);
}

/* ================= MOBILE RESPONSIVE ================= */
@media (max-width: 900px) {
  .nav-links { position: absolute; top: 80px; right: 0; background: rgba(0,0,0,0.9); flex-direction: column; width: 220px; padding: 20px; border-radius: 0 0 0 12px; display: none; }
  .nav-links.nav-active { display: flex; }
  .hamburger { display: block; }
  .hero-text-group { left: 20px; bottom: 100px; }
  .button-label { font-size: 1.8rem; }
  .join-btn { padding: 15px 24px; font-size: 1rem; }
  #introduction { padding: 30px; }
  .motivation { font-size: 36px; }
  .bottom-container { flex-direction: column; }
}
@media (max-width: 500px) {
  .button-label { font-size: 1.5rem; }
  .join-btn { font-size: 0.9rem; }
  .logo { width: 80px; }
  .logo-label { font-size: 1rem; }
}