* {
  box-sizing: border-box;
  padding: 0;
  margin: 0;
  font-family: "Roboto", sans-serif;
}

:root {
  --primary-color: #ff8a65;
  --secondary-color: #ff7043;
  --bg: #f5f7f8;
  --card-bg: #eceff1;
  --input-color: #b0bec5;
  --primary-text-color: #263238;
  --secondary-text-color: #607d8b;
  --button-color: #dbe2e5;
  --button-color-hover: #c4ced4;
  --red: #f44336;
}

.dark-mode {
  --primary-color: #d95f39;
  --secondary-color: #ff7043;
  --bg: #13191c;
  --card-bg: #263238;
  --input-color: #455a64;
  --primary-text-color: #eceff1;
  --secondary-text-color: #90a4ae;
  --button-color: #29353b;
  --button-color-hover: #37474f;
}

::selection {
  background-color: var(--primary-color);
  color: var(--bg);
}

body {
  background-color: var(--bg);
  overflow-x: hidden;
}

/* Navbar */
nav {
  height: 85px;
  padding: 20px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
}

nav h1 {
  font-size: 2rem;
  color: var(--primary-text-color);
  align-self: center;
}

nav .link-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

nav .link-group a {
  text-decoration: none;
  cursor: pointer;
  font-size: 3rem;
  color: var(--primary-text-color);
}

nav .link-group a:hover {
  color: var(--secondary-text-color);
  transition: color 0.3s;
}

/* Reusable Style */
section {
  display: flex;
  margin: 50px 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.card {
  width: 500px;
  border-radius: 10px;
  background-color: var(--card-bg);
  padding: 75px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  font-size: 3rem;
  color: var(--primary-text-color);
}

.input-group {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
}

.input-box {
  position: relative;
  width: 350px;
}

.input-box .input {
  font-size: 16px;
  color: var(--primary-text-color);
  user-select: none;
  width: 100%;
  height: 50px;
  padding: 15px;
  outline: none;
  border-radius: 10px;
  background-color: var(--card-bg);
  border: 1px solid var(--input-color);
}

.input-box .input-label {
  background: transparent;
  position: relative;
  z-index: 5;
  top: -34px;
  left: 16px;
  font-size: 16px;
  color: var(--input-color);
  user-select: none;
  cursor: text;
  transition: 0.3s;
}

.input-box + span {
  width: 350px;
  display: none;
  margin-bottom: 20px;
}

.input-box + span .mark {
  display: inline-block;
  font-size: 16px;
  text-align: center;
  color: var(--card-bg);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--red);
  user-select: none;
}

.input-box + span .error-text {
  display: inline;
  font-size: 16px;
  color: var(--red);
}

.input:focus {
  border: 1px solid var(--primary-color);
  transition: border 0.3s;
}

.input:focus ~ .input-label,
.input:not(:placeholder-shown) ~ .input-label {
  background: var(--card-bg);
  color: var(--secondary-text-color);
  padding: 5px;
  top: -60px;
  left: 10px;
  z-index: 5;
  font-size: 12px;
  cursor: default;
}

.input:focus ~ .input-label {
  color: var(--primary-color);
}

.check-element {
  width: 350px;
  margin-bottom: 3rem;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
}

input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  top: -1.5px;
  height: 16px;
  width: 16px;
  background-color: var(--input-color);
  border-radius: 2px;
  user-select: none;
  cursor: pointer;
}

input[type="checkbox"]:after {
  display: none;
  color: white;
  position: absolute;
  content: "\2714";
  top: -2px;
  left: 3px;
}

input[type="checkbox"]:checked {
  background-color: var(--primary-color);
}

input[type="checkbox"]:checked:after {
  display: block;
}

.check-element {
  margin-top: 5px;
}

.check-element label {
  font-size: 16px;
  color: var(--input-color);
  cursor: pointer;
}

.btn-group {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.btn {
  font-size: 16px;
  color: #f5f7f8;
  width: 350px;
  height: 50px;
  background-color: var(--primary-color);
  border-radius: 10px;
  border: none;
  user-select: none;
}

.btn:hover {
  background-color: var(--secondary-color);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:disabled:hover {
  background-color: var(--primary-color);
}

.cancel-btn {
  color: var(--primary-text-color);
  background-color: var(--button-color);
}

.cancel-btn:hover {
  background-color: var(--button-color-hover);
}

.under-card {
  margin: 1rem;
  display: flex;
  flex-direction: row;
  gap: 5px;
}

.under-card p {
  color: var(--secondary-text-color);
}

.under-card button {
  cursor: pointer;
  text-decoration: none;
  font-size: 16px;
  color: var(--primary-color);
  outline: none;
  border: none;
  background-color: transparent;
}

.under-card button:hover {
  color: var(--secondary-color);
}

/* Change Password card */
#change_password_card h1 {
  font-size: 2.5rem;
}

/* Delete Account and Success card */
#delete_account_card h1,
#success_card h1,
#welcome_card h1 {
  margin-bottom: 100px;
}

/* Invalid Input */
.invalid input {
  border: 1px solid var(--red) !important;
}

.invalid label {
  color: var(--red) !important;
}