/* ==================== 1. Reset & Base ==================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
    overflow-x: hidden;

  font-family: 'Poppins', sans-serif;
  display: flex;
  flex-direction: column;
  transition: background 0.4s ease, color 0.4s ease;
}

body.light { 
  background: #f0f2ff;
  color: #333; 
}

body.dark {
  background: #121212;
  color: #e0e0e0; 
}

/* Main content wrapper */
main {
  flex: 1 0 auto;
  padding-top: 100px;               
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Sections */
section {
  width: 100%;
  text-align: center;
  padding: 100px 20px;
}

#Colleges {
  text-align: center;
  font-family: inherit;
  position: relative;
  top: 90px;
}

/* ==================== 2. Navbar ==================== */
/* Navbar Container */
.nav-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;

  display: flex;
  align-items: center;

  padding: 0 20px;
  z-index: 1000;
  justify-content: space-between;
}


body.light .nav-container {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
  border-bottom: 1px solid #eaeaea;
}

body.dark .nav-container {
  background: #222;
  box-shadow: 0 2px 10px rgba(0,0,0,0.3);
  border-bottom: 1px solid #333;
}

/* Logo / Brand */
.brand {
  font-size: 24px;
  font-weight: 800;
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-right: 40px;
}

/* Navigation Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
  margin-right: auto;
  margin-left: 30px;
}

.nav-links a {
  text-decoration: none;
  font-size: 18px;
  font-weight: 500;
  color: #4a5568;
  padding: 8px 0;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap;
}

body.dark .nav-links a { color: #cbd5e0; }

.nav-links a:hover { color: #2652c0; }
body.dark .nav-links a:hover { color: #a3bffa; }

/* Underline Hover Effect */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav-links a:hover::after { width: 100%; }

/* Auth Buttons */
.auth-buttons {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
}

.auth-buttons button {
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  white-space: nowrap;
}

#login-btn {
  background: transparent;
  color: #2652c0;
  border: 2px solid #2652c0;
}

body.dark #login-btn {
  color: #a3bffa;
  border-color: #a3bffa;
}

#login-btn:hover {
  background: rgba(38, 82, 192, 0.1);
  transform: translateY(-2px);
}

#register-btn {
  background: linear-gradient(to right, #2652c0, #1ee9c0);
  color: white;
  box-shadow: 0 4px 12px rgba(38, 82, 192, 0.3);
}

#register-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(38, 82, 192, 0.4);
}

.logo {
  height: 60px;
  width: auto;
  object-fit: contain;
}

/* Theme Toggle Switch */
.switch {
  font-size: 17px;
  position: relative;
  display: inline-block;
  width: 3.5em;
  height: 2em;
  margin-left: 15px;
}

.switch input { 
opacity: 0;
width: 0;
height: 0;
}

.slider {
  --background: #28096b;
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--background);
  transition: 0.5s;
  border-radius: 30px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 1.4em;
  width: 1.4em;
  border-radius: 50%;
  left: 10%;
  bottom: 15%;
  box-shadow: inset 8px -4px 0px 0px #fff000;
  background: var(--background);
  transition: 0.5s;
}

input:checked + .slider {
  background-color: #522ba7;
}

input:checked + .slider:before {
  transform: translateX(100%);
  box-shadow: inset 15px -4px 0px 15px #fff000;
}

/* Hamburger Menu - Hidden on desktop */
/* Hamburger Menu */
.hamburger {
  display: none;
  width: 35px;
  height: 30px;

  flex-direction: column;
  justify-content: space-between;

  background: none;
  border: none;
  cursor: pointer;

  margin-left: auto; 

  z-index: 1001;
}

.hamburger span {
  display: flex;
  height: 4px;
  width: 100%;
  justify-content: space-between;
  background-color: #2652c0;
  border-radius: 2px;
  transition: all 0.3s ease;
}

body.dark .hamburger span {
  background-color: #a3bffa;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
  transform: translateX(20px);
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 300px;
  height: 100vh;
  background: #ffffff;
  box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
  z-index: 999;
  transition: right 0.4s ease;
  padding: 100px 30px;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

body.dark .mobile-menu {
  background: #222222;
  box-shadow: -5px 0 15px rgba(0, 0, 0, 0.3);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 25px;
}

.mobile-menu-links a {
  font-size: 20px;
  font-weight: 500;
  color: #4a5568;
  text-decoration: none;
  padding: 12px 0;
  border-bottom: 1px solid #eaeaea;
  transition: color 0.3s ease;
}

body.dark .mobile-menu-links a {
  color: #cbd5e0;
  border-bottom-color: #333333;
}

.mobile-menu-links a:hover {
  color: #667eea;
}

.mobile-auth-buttons {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-top: 20px;
}

.mobile-auth-buttons button {
  padding: 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 17px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
}

#mobile-login-btn {
  background: transparent;
  color: #667eea;
  border: 2px solid #667eea;
}

#mobile-register-btn {
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  color: white;
}
/* ==================== 3. Typography ==================== */
h1 {
  font-size: 3.9rem;
  font-weight: 800;
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 2rem;
  line-height: 1.2;
}

/* ==================== 4. Flip Cards ==================== */
.card-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2.8rem;
  max-width: 1300px;
  margin: 4rem auto;
  padding: 0 20px;
}

.flip-card {
  background: transparent;
  height: 390px;
  perspective: 1200px;
  flex: 0 0 300px;
  margin: 1rem;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.9s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner { transform: rotateY(180deg); }

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 12px 35px rgba(0,0,0,0.18);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

body.light .flip-card-front { background: white; }
body.dark .flip-card-front { background: #1e1e1e; }

.flip-card-front h3 {
  font-size: 1.9rem;
  margin: 1.8rem 0 1rem;
  font-weight: 700;
}

.flip-card-back {
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  color: white;
  transform: rotateY(180deg);
}

.flip-card-back img {
  width: 82%;
  max-width: 320px;
  border-radius: 18px;
  margin-bottom: 1.2rem;
  box-shadow: 0 12px 25px rgba(0,0,0,0.4);
}

/* ==================== 5. Forms ==================== */
.form-container {
  max-width: 480px;
  position: relative;
  top: 30px;
  width: 100%;
  margin: 2rem auto 4rem;
  padding: 3.8rem 3rem;
  border-radius: 28px;
  box-shadow: 0 25px 60px rgba(0,0,0,0.18);
}

body.light .form-container { background: white; }
body.dark .form-container { background: #1e1e1e; }

input, textarea {
  width: 100%;
  padding: 1.2rem;
  margin: 1.1rem 0;
  border: none;
  border-radius: 14px;
  font-family: inherit;
  font-size: 1.05rem;
  transition: all 0.3s ease;
}

body.light input,
body.light textarea { background: #f8f8ff; }

body.dark input,
body.dark textarea { background: #333; color: white; }

input:focus, textarea:focus {
  outline: none;
  transform: translateY(-2px);
  box-shadow: 0 0 0 5px rgba(102,126,234,0.25);
}

.submit-btn {
  width: 100%;
  padding: 1.4rem;
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  color: white;
  border: none;
  border-radius: 14px;
  font-size: 1.25rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 1.8rem;
  transition: all 0.4s ease;
}

.submit-btn:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 20px 40px rgba(38, 82, 192, 0.5);
}

/* ==================== 6. Footer ==================== */
footer {
  flex-shrink: 0;
  width: 100%;
  padding: 3.5rem 1rem;
  text-align: center;
  background: linear-gradient(135deg, #2652c0, #1ee9c0);
  color: white;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.5px;
}

/* ==================== 7. Responsive ==================== */
@media (max-width: 992px) {
  h1 {
    font-size: 3.3rem;
  }

  .card-grid {
    gap: 2rem;
  }

  .nav-links {
    gap: 1.5rem;
  }
}


@media (max-width: 768px) {
  h1 {
    font-size: 2.9rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .nav-links a {
    font-size: 0.9rem;
  }

  .create-account-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
  }

  .flip-card {
    height: 360px;
  }

  .form-container {
    padding: 3rem 2rem;
  }
}

@media (max-width: 640px) {
  .nav-container {
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 1rem;
  }

  .logo {
    order: 1;
    flex: 0;
    margin-right: auto;
  }

  .nav-links {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: 10px;
    gap: 0.8rem;
  }
}



@media (max-width: 480px) {

  /* Navbar layout */
  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    flex-wrap: nowrap;
  }

  /* Show hamburger */
  .hamburger {
    display: flex;
    order: 2;
    margin-left: auto;
  }

  /* Hide desktop elements */
  .nav-links,
  .auth-buttons {
    display: none;
  }

  /* Keep navbar clean */
  .nav-container {
    align-items: center;
  }
  /* Typography & spacing */
  h1 {
    font-size: 2.5rem;
  }

  .form-container {
    padding: 2.5rem 1.8rem;
  }

  .submit-btn {
    font-size: 1.15rem;
    padding: 1.2rem;
  }
}