*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --background: radial-gradient(circle, #1c2421, #121212);
  --text-color: #fff;
  --primary-color: #fff;
  --secondary-color: #1abc9c;
  --link-hover-color: #1abc9c;
  --info-bulle-bg: rgba(26, 188, 156, 0.9);
  --button-bg: #1abc9c;
  --button-hover-bg: #1cceaa;
  --input-bg: #2a2a2a;
  --border-color: #555;
  --active-bg-color: #333;
  --ue-block-bg: #1a1a1a;
  --ue-block-border-bottom: #444;
  --ue-results-border-color: #444;
  --calculate-btn-bg: #444;
  --calculate-btn-hover-bg: var(--secondary-color);
  --info-bulle-color: #000000;
  --footer-link-bg-hover: rgba(26, 188, 156, 0.1);
  --nav-hover-bg: rgba(26, 188, 156, 0.1);
  --footer-text-color: var(--text-color);
  --footer-link-color: var(--secondary-color);
  --footer-link-hover-bg: rgba(26, 188, 156, 0.1);
  --math-formula-color: var(--text-color);
  --button-text-color: #000000;
  --menu-bg-color: #2c2c2c;
  --box-shadow-main: 0 0 10px rgba(0, 0, 0, 0.5);
  --box-shadow-result: 0 0 5px rgba(0, 0, 0, 0.5);
  --box-shadow-hover: 0 0 5px rgba(26, 188, 156, 0.5);
  --box-shadow-info: 0 0 10px rgba(0, 0, 0, 0.5);
  --hamburger-color: var(--secondary-color);
}

body.light-theme {
  --background: radial-gradient(circle at center 80%, #6630bd 1%, #ffffff 95%);
  --text-color: #000000;
  --primary-color: #000000;
  --secondary-color: #8a2be2;
  --link-hover-color: #8a2be2;
  --info-bulle-bg: rgba(138, 43, 226, 0.9);
  --button-bg: #8a2be2;
  --button-hover-bg: #7a1fc2;
  --input-bg: #f0f0f0;
  --border-color: #ccc;
  --active-bg-color: rgba(129, 40, 212, 0.116);
  --ue-block-bg: #f0f0f0;
  --ue-block-border-bottom: #ddd;
  --ue-results-border-color: #ddd;
  --calculate-btn-bg: #ccc;
  --calculate-btn-hover-bg: var(--secondary-color);
  --info-bulle-color: #fff;
  --footer-link-bg-hover: rgba(97, 17, 172, 0.795);
  --nav-hover-bg: rgba(138, 43, 226, 0.1);
  --footer-text-color: var(--text-color);
  --footer-link-color: #cfb2e2;
  --footer-link-hover-bg: rgba(138, 43, 226, 0.1);
  --math-formula-color: var(--text-color);
  --button-text-color: #ffffff;
  --box-shadow-main: 0 0 10px rgba(112, 111, 111, 0.3);
  --box-shadow-result: 0 0 2px rgba(0, 0, 0, 0.1);
  --box-shadow-hover: 0 0 5px rgba(138, 43, 226, 0.5);
  --box-shadow-info: 0 0 10px rgba(0, 0, 0, 0.3);
  --hamburger-color: var(--text-color);
}

html,
body {
  background: var(--background);
  color: var(--text-color);
  font-family: "Cabinet Grotesk", sans-serif;
  margin: 0;
  padding: 0;
  height: 100%;
  overflow: hidden;
}

.scrollable-content {
  height: 100%;
  overflow-y: scroll;
  scrollbar-width: none;
  padding-left: 25px;
}

.scrollable-content::-webkit-scrollbar {
  display: none;
}

header {
  z-index: 1000;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: fixed;
  left: 0;
  top: 0;
  height: 100%;
  width: 100px;
  padding: 20px 0;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  z-index: 900;
}

.overlay.active {
  opacity: 1;
  visibility: visible;
}

nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-top: 20px;
  padding-left: 25px;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s, background-color 0.3s;
  margin: 15px 0;
  padding: 8px 12px;
  border-radius: 4px;
}

nav a:hover {
  color: var(--secondary-color);
  background-color: var(--nav-hover-bg);
}

nav a.active {
  color: var(--secondary-color);
  background-color: var(--active-bg-color);
  font-weight: bold;
}

nav a.disabled {
  color: gray;
  cursor: not-allowed;
  text-decoration: none;
  opacity: 0.6;
}

.logo-container {
  position: fixed;
  top: 50px;
  right: 50px;
}

.logo-container img {
  width: 150px;
  height: auto;
  z-index: 50;
}

h1 {
  text-align: center;
  margin: 30px 0;
  font-size: 2.2em;
  padding-top: 90px;
}

.specialty-select {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 10px;
}

.specialty-select.se {
  padding: 50px 0 5px 0;
}

.specialty-select.meca {
  padding: 50px 0 80px 0;
}

.specialty-select label {
  margin-right: 10px;
  font-size: 16px;
}

.styled-select,
.styled-input {
  appearance: none;
  background-color: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 8px 12px;
  color: var(--text-color);
  font-size: 16px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.styled-select {
  background-image: url('data:image/svg+xml;charset=US-ASCII,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="5" viewBox="0 0 10 5"><path fill="currentColor" d="M0 0l5 5 5-5z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 10px 5px;
  padding-right: 30px;
  cursor: pointer;
}

.styled-select:hover,
.styled-input:hover {
  border-color: var(--secondary-color);
  box-shadow: var(--box-shadow-hover);
}

.styled-select:focus,
.styled-input:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: var(--box-shadow-hover);
}

.styled-input::-webkit-outer-spin-button,
.styled-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.styled-input[type="number"] {
  -moz-appearance: textfield;
  -webkit-appearance: none;
  appearance: none;
}

#checkboxFCContainer {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin: 15px 0;
  padding: 0px 0 80px 0;
}

#checkboxFCContainer label {
  display: inline-flex;
  align-items: center;
  font-size: 16px;
  color: var(--text-color);
  cursor: pointer;
  background: none;
  border-radius: 4px;
  padding: 6px 10px;
  transition: background-color 0.3s;
}

#checkboxFCContainer label:hover {
  background-color: var(--nav-hover-bg);
}

#checkboxFCContainer input[type="checkbox"] {
  accent-color: var(--secondary-color);
  width: 18px;
  height: 18px;
  margin-right: 8px;
  cursor: pointer;
}

.ue-block {
  z-index: 400;
}

#ue-container {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.ue-block {
  display: flex;
  flex-direction: column;
  background: var(--ue-block-bg);
  width: 100%;
  border: 1px solid var(--border-color);
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--box-shadow-main);
  gap: 15px;
}

.ue-block h2 {
  margin: 0;
  font-size: 1.5em;
  color: var(--secondary-color);
  border-bottom: 1px solid var(--ue-block-border-bottom);
  padding-bottom: 8px;
}

.ue-content {
  display: flex;
  flex-direction: row;
  gap: 20px;
  align-items: stretch;
  padding-top: 5px;
}

.separator {
  width: 1px;
  background-color: var(--border-color);
  align-self: stretch;
}

.ue-inputs {
  flex: 3;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.course-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.ue-inputs form label {
  flex: 1;
  font-size: 14px;
  white-space: normal;
  word-wrap: break-word;
  overflow: visible;
}

.ue-inputs form input[type="number"] {
  flex: 0 0 60px;
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  text-align: center;
  padding: 6px 8px;
  border-radius: 4px;
  font-size: 14px;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.ue-inputs form input[type="number"]:hover {
  border-color: var(--secondary-color);
  box-shadow: var(--box-shadow-hover);
}

.ue-right {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.ue-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.ue-inputs input {
  width: 73px;
  margin-left: 5px;
}

.actions-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.actions-left input {
  flex: none;
  width: 30%;
}

.calculate-btn {
  background: var(--secondary-color);
  color: var(--button-text-color);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.3s, transform 0.2s;
  font-size: 14px;
}

.calculate-btn:hover {
  background: var(--button-hover-bg);
  transform: translateY(-2px);
}

.ue-results {
  background: var(--input-bg);
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--ue-results-border-color);
  box-shadow: var(--box-shadow-result);
  margin-top: auto;
  align-self: stretch;
  max-width: 100%;
  width: 100%;
}

.ue-results h3 {
  margin: 0 0 10px 0;
  font-size: 1.2em;
  color: var(--secondary-color);
  border-bottom: 1px solid var(--ue-results-border-color);
  padding-bottom: 5px;
}

.ue-results p {
  margin: 5px 0;
  font-size: 14px;
  color: var(--text-color);
}

.info-bulle-container {
  position: fixed;
  bottom: 45px;
  left: 45px;
  z-index: 1001;
}

.info-icon {
  position: relative;
  cursor: pointer;
  font-size: 24px;
  color: var(--secondary-color);
}

.info-bulle {
  visibility: hidden;
  width: 280px;
  max-width: 90vw;
  background-color: var(--info-bulle-bg);
  color: var(--info-bulle-color);
  text-align: center;
  border-radius: 6px;
  padding: 10px;
  position: absolute;
  z-index: 1002;
  bottom: 35px;
  left: 0;
  opacity: 0;
  transition: opacity 0.3s;
  box-shadow: var(--box-shadow-info);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.info-icon:hover .info-bulle,
.info-bulle-container.active .info-bulle {
  visibility: visible;
  opacity: 1;
}

.info-bulle p {
  margin: 6px 0;
  font-size: 15px;
  font-weight: bold;
}

.info-bulle .math-formula {
  font-size: 14px;
  word-wrap: break-word;
  color: var(--info-bulle-color);
}

.info-bulle .math-formula .mjx-chtml {
  max-width: 100%;
  display: block;
  overflow-wrap: break-word;
}

.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-color);
  font-size: 24px;
  cursor: pointer;
  position: fixed;
  bottom: 45px;
  right: 45px;
  z-index: 1001;
}

.theme-toggle-btn:focus {
  outline: none;
}

.theme-toggle-btn:hover {
  color: var(--secondary-color);
}

footer {
  text-align: center;
  padding: 20px;
  margin-top: 40px;
  color: var(--footer-text-color);
}

footer a.github-link {
  color: var(--footer-link-color);
  text-decoration: none;
  font-size: 16px;
  transition: color 0.3s, background-color 0.3s;
  padding: 8px 4px;
  border-radius: 4px;
}

footer a.github-link:hover {
  color: var(--footer-link-color);
  background-color: var(--footer-link-bg-hover);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--hamburger-color);
  font-size: 24px;
  position: absolute;
  cursor: pointer;
  z-index: 1001;
}

.hamburger:focus {
  outline: none;
}

@media (max-width: 1200px) {
  .scrollable-content {
    height: 100%;
    padding-left: 0px;
    position: relative;
  }

  header {
    position: relative;
    width: 100%;
    height: auto;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    top: 20px;
    padding-bottom: 0;
    margin-bottom: 0;
  }

  .hamburger {
    position: static;
    display: block;
  }

  .info-bulle-container {
    display: none;
  }

  nav {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    background-color: var(--menu-bg-color);
    flex-direction: column;
    justify-content: flex-start;
    align-items: flex-start;
    padding: 70px 15px;
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
    z-index: 1100;
  }

  nav.active {
    transform: translateX(0);
    opacity: 1;
    pointer-events: auto;
  }

  nav a {
    font-size: 18px;
    color: #ffffff;
    transition: color 0.3s, background-color 0.3s;
    width: 100%;
    box-sizing: border-box;
    padding: 8px 10px;
    margin: 0 0 10px 0;
    text-decoration: none;
  }

  .logo-container {
    display: none;
  }

  .theme-toggle-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    position: absolute;
    top: 40px;
    right: 0;
    bottom: auto;
    z-index: 1001;
    color: var(--hamburger-color);
  }

  .theme-toggle-btn:hover {
    color: var(--hamburger-color);
  }

  body.menu-open {
    overflow: hidden;
  }
}

@media only screen and (max-width: 1050px) {
  .ue-content {
    flex-direction: column;
  }

  .ue-inputs,
  .ue-right {
    flex: none;
    width: 100%;
  }

  .ue-inputs input {
    width: 63px;
    margin-left: 3px;
  }

  .separator {
    display: none;
  }

  .ue-right {
    gap: 10px;
    padding-left: 0;
  }

  .ue-actions {
    justify-content: flex-start;
  }

  .ue-results {
    max-height: none;
    align-self: stretch;
    max-width: 100%;
  }

  .ue-inputs {
    gap: 12px;
  }

  .ue-inputs form > div {
    margin-bottom: 8px;
  }

  #page-title {
    font-size: 1.5em;
    padding-top: 45px;
    margin: 35px;
  }

  .specialty-select {
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin: 15px 0;
  }

  .specialty-select label {
    margin-right: 0;
    margin-bottom: 10px;
    font-size: 1.1em;
  }

  .styled-select {
    width: 80%;
    max-width: 300px;
    padding: 10px;
    font-size: 1em;
  }

  #ue-container {
    width: 95%;
  }

  .ue-content {
    flex-direction: column;
  }

  .ue-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    gap: 10px;
    margin-top: 10px;
  }

  .actions-left {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
  }

  .actions-left label {
    margin-bottom: 0;
    font-size: 1em;
    white-space: nowrap;
    text-align: right;
  }

  .actions-left input {
    padding: 6px;
    font-size: 1em;
    box-sizing: border-box;
    flex: none;
    width: 15%;
    max-width: 60px;
  }

  .calculate-btn {
    padding: 8px 25px;
    font-size: 1em;
    cursor: pointer;
    flex-shrink: 0;
    align-self: center;
    margin: 10px;
  }
}

@media (min-width: 500px) {
  .hamburger {
    padding-left: 20px;
  }

  .theme-toggle-btn {
    right: 15px;
  }
}

@media (min-width: 1300px) {
  .theme-toggle-btn {
    right: 45px;
  }
}

@media (max-width: 1024px) {
  input[type="text"],
  input[type="number"],
  select {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
  }
}