/* style.css */
:root {
  --primary-green: #2E8B57;
  --secondary-green: #3CB371;
  --dark-green: #1E5C3A;
  --light-green: #90EE90;
  --lighter-green: #E8F5E9;
  --accent-gold: #FFD700;
  --white: #FFFFFF;
  --black: #333333;
  --gray: #757575;
  --light-gray: #f5f5f5;
  --transition: all 0.3s ease;
}

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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--light-gray);
  color: var(--black);
  font-family: 'Open Sans', sans-serif;
  line-height: 1.6;
}

header {
  background-color: var(--primary-green);
  color: var(--white);
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: relative;
  z-index: 100;
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.date {
  font-size: 0.9rem;
  opacity: 0.9;
  font-weight: 400;
}

h1 {
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  margin: 0;
  font-weight: 700;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.2);
}

nav {
  background-color: var(--secondary-green);
  padding: 0.5rem 1rem;
  position: sticky;
  top: 0;
  z-index: 90;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu {
  display: flex;
  list-style: none;
  gap: 1rem;
}

.menu li a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: var(--transition);
  font-size: 0.95rem;
}

.menu li a:hover,
.menu li a:focus {
  background-color: var(--dark-green);
  outline: none;
}

.hamburger {
  display: none;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.8rem;
  padding: 0.5rem;
  transition: var(--transition);
}

.hamburger:hover {
  transform: scale(1.1);
}

main {
  flex: 1;
  padding: 2rem 1rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.learning-app {
  background-color: var(--white);
  border-radius: 15px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  padding: 2rem;
  margin: 0 auto;
  max-width: 600px;
  text-align: center;
}

.app-title {
  font-size: 1.8rem;
  color: var(--primary-green);
  margin-bottom: 1rem;
}

.word-counter {
  font-size: 1rem;
  color: var(--gray);
  margin-bottom: 0.5rem;
}

.timer {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: #ff5722;
}

.word-container {
  margin-bottom: 2rem;
  padding: 1.5rem;
  background-color: var(--lighter-green);
  border-radius: 8px;
}

.word-container p {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.translation-input {
  padding: 0.8rem 1rem;
  width: 100%;
  max-width: 400px;
  border: 2px solid var(--secondary-green);
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.translation-input:focus {
  outline: none;
  border-color: var(--primary-green);
  box-shadow: 0 0 0 3px rgba(46, 139, 87, 0.2);
}

.btn {
  padding: 0.8rem 1.8rem;
  background-color: var(--primary-green);
  color: var(--white);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: var(--transition);
  font-size: 1rem;
  margin: 0.5rem;
}

.btn:hover {
  background-color: var(--dark-green);
  transform: translateY(-2px);
}

.btn-check {
  background-color: var(--primary-green);
}

.btn-new {
  background-color: var(--secondary-green);
}

.btn-reset {
  background-color: #f44336;
}

.result {
  font-weight: bold;
  margin: 1.5rem 0;
  font-size: 1.2rem;
  min-height: 2rem;
}

.score-container {
  margin-top: 2rem;
  padding: 1.5rem;
  background-color: var(--light-gray);
  border-radius: 8px;
}

.score {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.error-stats {
  margin-top: 1.5rem;
  text-align: left;
  padding: 1rem;
  background-color: #fff8e1;
  border-radius: 8px;
  border-left: 4px solid #ffc107;
}

footer {
  background-color: var(--primary-green);
  color: var(--white);
  padding: 2rem 1rem;
  text-align: center;
  margin-top: auto;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
}

.copyright {
  font-size: 0.9rem;
  opacity: 0.9;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--dark-green);
  color: white;
  padding: 0.8rem;
  z-index: 100;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 0;
}

@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    align-items: stretch;
  }
  
  .menu {
    display: none;
    flex-direction: column;
    gap: 0.5rem;
    padding: 1rem 0 0;
  }

  .menu.active {
    display: flex;
  }

  .hamburger {
    display: block;
    align-self: flex-end;
  }

  .learning-app {
    padding: 1.5rem;
  }
}

@media (max-width: 480px) {
  .app-title {
    font-size: 1.5rem;
  }
  
  .word-container p {
    font-size: 1.3rem;
  }
  
  .btn {
    display: block;
    width: 100%;
    margin: 0.5rem 0;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.word-container.fade-in {
  animation: fadeInUp 0.6s ease forwards;
}