body {
  font-family: 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, #e8f5e9, #a5d6a7); /* green-white gradient */
  margin: 0;
  padding-top: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 100px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 30px;
  background: transparent;
  z-index: 1000;
}

.logo-container {
  position: fixed;
  top: 1rem;
  left: 1.5rem;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  animation: slideInLeft 0.6s ease-out;
}
.logo-container img {
  height: 60px;
}
.university-text {
  margin-top: 0.3rem;
  font-size: 1rem;
  font-weight: 600;
  color: #1e3a8a;
  text-align: center;
}

#backBtn {
  position: fixed;
  top: 1rem;
  right: 2rem;
  background-color: #1e40af;
  color: white;
  padding: 0.5rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  animation: slideInRight 0.6s ease-out;
}

#backBtn:hover {
  background-color: #2563eb;
  transform: scale(1.05);
}

main {
  width: 100%;
  max-width: 800px;
  padding: 0 20px;
}

form {
  background: #fff;
  padding: 35px;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  animation: fadeSlide 0.6s ease;
}

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

h2 {
  text-align: center;
  color: #1f5f8b;
  margin-bottom: 25px;
  font-size: 1.5rem;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  color: #2c3e50;
}

input,
select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1.5px solid #a9cce3;
  margin-bottom: 18px;
  font-size: 1rem;
  box-sizing: border-box;
}

.semester-year {
  display: flex;
  gap: 15px;
  align-items: center;
}

fieldset {
  border: 1.5px solid #d6eaf8;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 20px;
}

legend {
  font-weight: 700;
  font-size: 1.1rem;
  color: #2c3e50;
  margin-bottom: 10px;
}

.preview-btn {
  background-color: #1e40af;
  color: white;
  padding: 0.7rem 2.5rem;
  width: 100%;
  border: none;
  border-radius: 12px;
  font-size: 1.1rem;
  cursor: pointer;
  box-shadow: 0 6px 15px rgba(30, 64, 175, 0.4);
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.preview-btn:hover {
  background-color: #2563eb;
  transform: scale(1.05);
}
/* Flatpickr custom theme for a modern professional look */
.flatpickr-calendar {
  border-radius: 12px !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15) !important;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  font-size: 16px;
  border: 1px solid #0a74da !important; /* Primary blue border */
}

.flatpickr-months {
  background-color: #0a74da !important;
  border-radius: 12px 12px 0 0 !important;
  color: white !important;
  font-weight: 700;
  padding: 10px 0 !important;
}

.flatpickr-months {
  background: linear-gradient(90deg, #a3c1e1, #d9e4f5);
  color: #2a3f66;
  font-weight: 600;
}


.flatpickr-weekdaycontainer {
  border-bottom: 1px solid #0a74da !important;
}

.flatpickr-weekday {
  color: #0a74da !important;
  font-weight: 600;
  font-size: 0.9em;
}

.flatpickr-day {
  border-radius: 8px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.flatpickr-day:hover {
  background-color: #0a74da !important;
  color: white !important;
  cursor: pointer;
}

.flatpickr-day.selected,
.flatpickr-day.startRange,
.flatpickr-day.endRange {
  background: #0a74da !important;
  color: white !important;
  box-shadow: 0 0 10px #0a74daaa;
  border-radius: 8px;
}

.flatpickr-day.today {
  border: 2px solid #ffc107 !important; /* Gold border for today */
  font-weight: 700;
}

.flatpickr-input {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1.5px solid #0a74da;
  font-size: 16px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  transition: border-color 0.3s ease;
}

.flatpickr-input:focus {
  outline: none;
  border-color: #004aad;
  box-shadow: 0 0 8px #0a74da88;
}
/* Animations */
@keyframes slideIn {
  from {
    transform: translateY(30px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-50px);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slideInRight {
  from {
    transform: translateX(50px);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.animate-slide-in {
  animation: slideIn 0.8s ease-out;
}

.animate-fade-in {
  animation: fadeIn 0.8s ease-in;
}