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

:root {
  --background: #fafafa;
  --primary: #2cb67d;
  --almost-gray: #666666;
}

body {
  font-family: "Inter", sans-serif;
  padding: 2rem;
  background-color: var(--background);
}

.nav {
  margin: auto;
  margin-bottom: 3rem;
  max-width: 800px;
}

.nav-header {
  display: flex;
  justify-content: space-between;
}

.nav-lining {
  width: 100%;
  height: 1px;
  background-color: #66666644;
  margin: 1rem 0;
}

.sub-heading-nav {
  color: var(--almost-gray);
  padding: 0.5rem 0 1rem 0;
}

.nav-heading {
  font-size: 1.5rem;
}

.nav-header a {
  text-decoration: none;
  color: inherit;
}

.nav-highlight {
  color: var(--primary);
}

.subject-template-container {
  color: var(--almost-gray);
  display: none;
}

.subject-template-container ul {
  margin: 1rem 0 1rem 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.subject-options {
  display: flex;
  list-style: none;
  justify-content: center;
  margin: 1rem auto;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 900px;
}

.subject-options li {
  width: 150px;
  height: 40px;
  position: relative;
}

.subject-options label,
.subject-options input {
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.subject-options input[type="radio"] {
  opacity: 0.01;
  z-index: 100;
}

.subject-options input[type="radio"]:checked + label {
  border: 2px solid var(--primary);
  color: var(--primary);
  background-color: #00000002;
}

.subject-options label {
  padding: 5px;
  font-family: "Inter";
  color: gray;
  border: 2px solid #66666644;
  cursor: pointer;
  border-radius: 3px;
  z-index: 90;
  text-align: center;
  font-weight: 600;
}

.subject-options label:hover {
  background: #ddd;
}

input[type="date"] {
  background-color: var(--primary);
  padding: 5px 15px;
  color: #ffffff;
  font-size: 14px;
  border: none;
  outline: none;
  border-radius: 5px;
  font-weight: 700;
  font-family: "Inter";
}
::-webkit-calendar-picker-indicator {
  background-color: #ffffff;
  padding: 5px;
  cursor: pointer;
  border-radius: 3px;
}

.btn {
  background-color: var(--primary);
  padding: 5px 15px;
  color: #ffffff;
  font-size: 15px;
  border: 2px solid rgba(0, 100, 0, 0.346);
  outline: none;
  border-radius: 3px;
  cursor: pointer;
}

.btn:hover {
  opacity: 0.9;
}

.btn:active {
  opacity: 0.8;
  border: 2px solid rgba(0, 100, 0, 0.5);
}

.btn-red {
  background-color: #ce0505;
  border: 2px solid rgba(100, 0, 0, 0.346);
}

.form-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 2rem;
}

.table-heading {
  text-align: center;
  margin-bottom: 1rem;
}

table {
  width: 100%;
  max-width: 30rem;
  border-collapse: collapse;
  border: 1px solid #ccc;
  margin: auto;
  margin-bottom: 1rem;
}

table th {
  background-color: var(--primary);
  color: #ffffff;
  font-weight: 600;
  padding: 0.5rem;
}

table td {
  padding: 0.5rem;
  border: 1px solid #ccc;
  text-align: center;
}

table tr:nth-child(even) {
  background-color: #f2f2f2;
}

table tr:nth-child(odd) {
  background-color: #ffffff;
}

table tr:hover {
  background-color: #ddd;
}

/* The snackbar - position it at the bottom and in the middle of the screen */
#snackbar {
  visibility: hidden; /* Hidden by default. Visible on click */
  min-width: 250px; /* Set a default minimum width */
  margin-left: -125px; /* Divide value of min-width by 2 */
  background-color: var(--primary); /* Black background color */
  color: #fff; /* White text color */
  text-align: center; /* Centered text */
  border-radius: 2px; /* Rounded borders */
  padding: 16px; /* Padding */
  position: fixed; /* Sit on top of the screen */
  z-index: 1; /* Add a z-index if needed */
  left: 50%; /* Center the snackbar */
  bottom: 30px; /* 30px from the bottom */
}

/* Show the snackbar when clicking on a button (class added with JavaScript) */
#snackbar.show {
  visibility: visible; /* Show the snackbar */
  /* Add animation: Take 0.5 seconds to fade in and out the snackbar.
  However, delay the fade out process for 2.5 seconds */
  -webkit-animation: fadein 0.5s, fadeout 0.5s 2.5s;
  animation: fadein 0.5s, fadeout 0.5s 2.5s;
}

/* Animations to fade the snackbar in and out */
@-webkit-keyframes fadein {
  from {
    bottom: 0;
    opacity: 0;
  }
  to {
    bottom: 30px;
    opacity: 1;
  }
}

@keyframes fadein {
  from {
    bottom: 0;
    opacity: 0;
  }
  to {
    bottom: 30px;
    opacity: 1;
  }
}

@-webkit-keyframes fadeout {
  from {
    bottom: 30px;
    opacity: 1;
  }
  to {
    bottom: 0;
    opacity: 0;
  }
}

@keyframes fadeout {
  from {
    bottom: 30px;
    opacity: 1;
  }
  to {
    bottom: 0;
    opacity: 0;
  }
}

/* Settings Page */

.add-subject-input {
  width: 100%;
  max-width: 400px;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 3px;
  font-size: 1rem;
  font-family: "Inter";
}

.settings-form {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}

.settings-form-label {
  color: var(--almost-gray);
  padding-top: 4px;
}

.settings-list {
  max-width: 800px;
  margin: auto;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.settings-list li h2 {
  color: var(--almost-gray);
}

#delete-subject-input-div {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
}

.delete-subject-option {
  display: flex;
  gap: 10px;
}

.delete-classes-container {
  width: 100%;
}

.delete-class-btn {
  color: #ce0505;
  background-color: transparent;
  border: none;
  outline: none;
  font-weight: 700;
  cursor: pointer;
  z-index: 5;
}