:root {
  --primary-color: #4caf50;
  --secondary-color: #ffffff;
  --box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  --transition: 0.3s ease;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: poppins, sans-serif;
}
.container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(3, 1fr);
  grid-template-areas:
    "header header header header"
    "main main main main"
    "footer footer footer footer";
  width: 100%;
  height: 100vh;
}
header {
  grid-area: header;
  width: 100%;
}
.head {
  width: 100%;
  display: flex;
  flex: 1 1 0;
  align-items: center;
  justify-content: space-evenly;
  background-color: var(--primary-color);
  padding: 20px;
  gap: 10px;
  text-align: center;
}
.head > h2 {
  color: var(--secondary-color);
  text-transform: uppercase;
}
.logo {
  min-width: 70px;
  max-width: 100px;
}
.subject-tab {
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-evenly;
  gap: 10px;
}
.tab {
  padding: 10px 20px;
  cursor: pointer;
  border: none;
  outline: none;
  border-radius: 6px;
}
.tab:hover {
  color: var(--secondary-color);
  background-color: var(--primary-color);
  border: 1px solid var(--secondary-color);
  transition: var(--transition);
  font-weight: 400;
}
.tab.active {
  background-color: rgb(223, 223, 21);
  color: black;
  font-weight: bold;
}

.tab.attempted {
  background-color: var(--primary-color);
  color: var(--secondary-color);
}

.tab.active.attempted {
  background-color: #2e7d32;
}

.timer-box {
  padding: 10px 20px;
  background: rgb(223, 223, 21);
  border-radius: 6px;
  font-weight: bold;
}
main {
  grid-area: main;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.question-header {
  flex-shrink: 0;
}

.question-footer {
  flex-shrink: 0;
}

.exam-container {
  display: grid;
  grid-template-columns: 3fr 1fr;
  place-items: center;
  width: 80%;
}
.question-area {
  display: flex;
  width: 80%;
  box-shadow: var(--box-shadow);
  border-radius: 20px;
}
.question-card {
  display: flex;
  flex-direction: column;
  padding: 20px;
  height: 100%;
  flex: 1 1 0;
}
.question-body {
  display: flex;
  flex-direction: column;
  flex: 1 1 0;
  gap: 10px;
}
.question-body::-webkit-scrollbar {
  width: 6px;
}
.question-body::-webkit-scrollbar-thumb {
  background: var(--primary-color);
  border-radius: 10px;
}

.option-list {
  display: flex;
  flex-direction: column;
}
.options {
  padding: 10px 20px;
  border: 1px solid #ddd;
  margin: 5px;
  border-radius: 20px;
}
.options:hover {
  background-color: rgba(0, 0, 0, 0.1);
  border: 2px solid var(--primary-color);
  cursor: pointer;
  transition: var(--transition);
}
.indicator {
  color: var(--primary-color);
  font-weight: bold;
}
.question-footer {
  display: flex;
  flex: 1 1 0;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
}
.btn {
  padding: 10px 20px;
  background-color: var(--primary-color);
  outline: none;
  border: none;
  cursor: pointer;
  border-radius: 10px;
  color: var(--secondary-color);
  font-weight: 600;
}
.btn:hover {
  background-color: rgb(223, 223, 21);
  color: black;
  transition: var(--transition);
}
.question-palette {
  box-shadow: var(--box-shadow);
  padding: 20px;
}
.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.legent-item {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 5px;
}
.box {
  width: 15px;
  height: 15px;
  border-radius: 2px;
  border: 1px solid #ddd;
  display: inline-block;
}
.box.answered {
  background: var(--primary-color);
}
.box.current {
  border: 2px solid rgb(223, 223, 21);
}
footer {
  grid-area: footer;
  width: 100%;
  background-color: var(--primary-color);
  height: 100px;
  margin-top: 150px;
  color: var(--secondary-color);
  display: flex;
  align-items: center;
  justify-content: center;
}
.login {
  width: 50%;
  margin: auto;
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
  padding: 20px;
  border-radius: 10px;
  gap: 5px;
  text-align: center;
  font-weight: bold;
}
.login > input {
  padding: 10px 20px;
  outline: none;
  border: 2px solid var(--primary-color);
  border-radius: 20px;
}
.login > label {
  align-self: flex-start;
  color: var(--primary-color);
}
.login > input[type="submit"] {
  width: 30%;
  align-self: center;
  margin-top: 10px;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  font-weight: bold;
  cursor: pointer;
  position: relative;
}
.login > input[type="submit"]:hover {
  background-color: var(--secondary-color);
  color: black;
  transition: var(--transition);
}
.login > input[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
#subject-checkboxes {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 10px 0;
}
.subject-label {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 5px;
  border: 1px solid #ddd;
  border-radius: 5px;
  cursor: pointer;
}
.subject-label:hover {
  background-color: rgba(0, 0, 0, 0.05);
}
.subject-label input[type="checkbox"] {
  margin: 0;
}
.spinner {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid #f3f3f3;
  border-top: 2px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}
/* Calculator Modal */
.modal {
  display: none; /* Hidden by default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
}

.modal-content {
  background-color: var(--secondary-color);
  padding: 20px;
  border-radius: 10px;
  width: 250px;
  text-align: center;
  box-shadow: var(--box-shadow);
}

.modal-content #calc-display {
  width: 100%;
  padding: 10px;
  font-size: 18px;
  margin-bottom: 10px;
  text-align: right;
}

.calc-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 5px;
}

.calc-buttons button {
  padding: 15px;
  font-size: 16px;
  border: 1px solid #ddd;
  border-radius: 5px;
  cursor: pointer;
  background-color: var(--primary-color);
  color: var(--secondary-color);
}

.calc-buttons button:hover {
  background-color: rgb(223, 223, 21);
  color: black;
  transition: var(--transition);
}

.close {
  float: right;
  font-size: 22px;
  cursor: pointer;
}
.result-main {
  display: grid;
  place-items: center;
  grid-template-columns: repeat(4, 1fr);
  grid-template-areas: "result-cont result-cont result-cont result-cont";
  height: 100vh;
  width: 100%;
}
.result-container {
  grid-area: result-cont;
  display: flex;
  gap: 10px;
  flex-direction: column;
  width: 70%;
}
.test {
  text-align: center;
}
/* Mobile version */
@media (max-width: 760px) {
  .container {
    grid-template-columns: 1fr;
  }
  .head {
    flex-wrap: wrap;
    justify-content: center;
    text-align: center;
  }
  .subject-tab {
    flex-wrap: wrap;
    justify-content: center;
  }
  .exam-container {
    grid-template-columns: 1fr;
    width: 100%;
  }
  .btn {
    padding: 5px 10px;
    margin: 5px;
  }
  .question-palette {
    margin-top: 20px;
    width: 100%;
  }
  footer {
    text-align: center;
  }
  .login {
    margin-top: 10px;
    width: 80%;
    text-align: center;
  }
  .login > label {
    align-self: center;
  }
  .login > input[type="submit"] {
    width: 100%;
  }
  .login > input {
    text-align: center;
  }
  .result-container {
    width: 100%;
  }
  .result-main {
    grid-template-columns: 1fr;
  }
}