/* Root colour palette reminiscent of wine tones */
:root {
  --wine-dark: #4b2e39;
  --wine-red: #8b2e49;
  --wine-light: #f6f1e9;
  --wine-accent: #c95d63;
  --text-dark: #2a1e23;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--wine-light);
  color: var(--text-dark);
  line-height: 1.6;
}

header#hero {
  position: relative;
  background-image: url('assets/background.png');
  background-size: cover;
  background-position: center;
  height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
}

header#hero .overlay {
  background: rgba(255, 255, 255, 0.8);
  padding: 1.5rem 2rem;
  text-align: center;
  border-radius: 8px;
  margin-bottom: 1rem;
}

header#hero h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--wine-dark);
  margin-bottom: 0.25rem;
}

header#hero p {
  font-size: 1rem;
  color: var(--wine-red);
}

nav {
  width: 100%;
  background-color: var(--wine-dark);
  position: sticky;
  top: 0;
  z-index: 10;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
}

nav li {
  margin: 0.5rem 1rem;
}

nav a {
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

nav a:hover,
nav a.active {
  background-color: var(--wine-accent);
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

h2 {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
  color: var(--wine-dark);
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--wine-red);
}

p, ul {
  margin-bottom: 1rem;
}

ul li {
  margin-left: 1.5rem;
  margin-bottom: 0.5rem;
}

footer {
  text-align: center;
  padding: 1rem;
  background-color: var(--wine-dark);
  color: #fff;
  margin-top: 2rem;
  font-size: 0.9rem;
}

/* Section visibility */
.level-section {
  display: none;
  animation: fadeIn 0.6s ease forwards;
}

.level-section.active {
  display: block;
}

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

/* Chart styling */
#chart-intro {
  max-width: 100%;
  margin: 1rem auto;
}

/* Flashcard styles */
.flashcard-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.flashcard {
  width: calc(50% - 1rem);
  perspective: 1000px;
}

.flashcard-inner {
  position: relative;
  width: 100%;
  padding: 1rem;
  background-color: #fff;
  border: 1px solid var(--wine-accent);
  border-radius: 8px;
  height: 150px;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  cursor: pointer;
}

.flashcard.is-flipped .flashcard-inner {
  transform: rotateY(180deg);
}

.flashcard-front, .flashcard-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  text-align: center;
}

.flashcard-front {
  background-color: var(--wine-dark);
  color: #fff;
  border-radius: 8px;
}

.flashcard-back {
  background-color: #fff;
  color: var(--text-dark);
  border: 1px solid var(--wine-accent);
  border-radius: 8px;
  transform: rotateY(180deg);
}

/* Exam styles */
.exam-container {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--wine-accent);
  border-radius: 8px;
  background-color: #fff;
}

.exam-container h4 {
  margin-bottom: 0.5rem;
  color: var(--wine-dark);
}

.exam-container .question {
  margin-bottom: 0.75rem;
}

.exam-container button {
  display: inline-block;
  background-color: var(--wine-accent);
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: background-color 0.3s ease;
}

.exam-container button:hover {
  background-color: var(--wine-red);
}

.exam-result {
  margin-top: 1rem;
  font-weight: bold;
}