/* Modern design for German Articles Quiz */
:root {
    /* Light theme variables */
    --primary: #4E6CFF;
    --primary-dark: #3A56E8;
    --secondary: #FF6B6B;
    --light: #F9F9FB;
    --dark: #2D3748;
    --gray: #718096;
    --correct: #38A169;
    --wrong: #E53E3E;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --bg-color: var(--light);
    --container-bg: white;
    --text-color: var(--dark);
    --word-bg: var(--light);
    --radius: 12px;
    --transition: all 0.3s ease;
}

/* Dark theme class */
.dark-theme {
    --bg-color: #1A202C;
    --container-bg: #2D3748;
    --text-color: #F7FAFC;
    --light: #4A5568;
    --word-bg: #4A5568;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Nunito', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    transition: var(--transition);
}
  
/* Main container */
.quiz-container {
    background-color: var(--container-bg);
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 500px;
    width: 100%;
    margin: 0 auto;
    transition: var(--transition);
}
  
/* Header container for title and theme toggle */
.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin: 0;
}

/* Theme toggle switch */
.theme-switch-container {
    display: flex;
    align-items: center;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 30px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray);
    transition: var(--transition);
    border-radius: 30px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 22px;
    width: 22px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: var(--transition);
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(30px);
}

.theme-icon {
    margin: 0 8px;
    font-size: 20px;
}
  
.status {
    background-color: var(--word-bg);
    border-radius: var(--radius);
    padding: 0.8rem 1.2rem;
    margin: 1.5rem 0;
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    color: var(--gray);
    font-size: 0.9rem;
    transition: var(--transition);
}
  
.status-item {
    display: flex;
    align-items: center;
}
  
.status-item span {
    margin-left: 0.5rem;
    font-weight: 700;
    color: var(--text-color);
}
  
/* Word display */
.word {
    font-size: 2rem;
    font-weight: 700;
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: var(--word-bg);
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
    text-align: center;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    position: relative;
}
  
.word:hover {
    transform: translateY(-2px);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05), 0 4px 8px rgba(0,0,0,0.05);
}
  
.word::after {
    content: "👆 Tap for translation";
    position: absolute;
    bottom: -1.5rem;
    left: 0;
    right: 0;
    font-size: 0.8rem;
    font-weight: normal;
    color: var(--gray);
    opacity: 0.7;
}
  
/* Article buttons */
#buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 2rem 0;
}
  
.button {
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 2px solid var(--primary);
    border-radius: var(--radius);
    padding: 0.8rem 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    height: auto;
    width: auto;
    min-height: 60px;
}
  
.button:hover {
    background-color: var(--primary);
    color: white;
    transform: translateY(-2px);
}
  
.button:active {
    transform: translateY(0);
}
  
.button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}
  
.button.correct {
    background-color: var(--correct);
    border-color: var(--correct);
    color: white;
}
  
.button.wrong {
    background-color: var(--wrong);
    border-color: var(--wrong);
    color: white;
}
  
/* Navigation buttons */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 1.5rem;
}
  
#nextButton, #stopButton {
    padding: 0.8rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: var(--transition);
    width: 48%;
}
  
#nextButton {
    background-color: var(--primary);
    color: white;
    border: none;
}
  
#nextButton:hover {
    background-color: var(--primary-dark);
}
  
#nextButton:disabled {
    background-color: var(--gray);
    cursor: not-allowed;
}
  
#stopButton {
    background-color: transparent;
    color: var(--gray);
    border: 2px solid var(--gray);
}
  
#stopButton:hover {
    background-color: var(--gray);
    color: white;
}
  
/* Results section */
#results {
    background-color: var(--container-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 2rem;
    box-shadow: var(--shadow);
    width: 100%;
    transition: var(--transition);
}
  
#results h2 {
    color: var(--primary);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--light);
    padding-bottom: 0.5rem;
}
  
#results h3 {
    color: var(--text-color);
    font-size: 1.2rem;
    margin: 1.5rem 0 0.8rem;
}
  
#results p {
    margin: 0.5rem 0;
    font-size: 1rem;
}
  
#results ul {
    list-style-type: none;
    padding: 0;
    margin: 1rem 0;
}
  
#results li {
    padding: 0.8rem;
    margin-bottom: 0.8rem;
    background-color: var(--word-bg);
    border-radius: var(--radius);
    font-size: 0.95rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}
  
/* Failed lists section */
#failedListButton, #saveFailedListButton {
    margin: 1rem 0.5rem;
    padding: 0.8rem 1.5rem;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
}
  
#failedListsContainer {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--container-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    transition: var(--transition);
}
  
#failedListsContainer h2 {
    color: var(--primary);
    font-size: 1.3rem;
    margin-bottom: 1rem;
}
  
#failedListsSelect {
    padding: 0.8rem;
    border-radius: var(--radius);
    border: 2px solid var(--light);
    font-size: 1rem;
    margin-right: 0.5rem;
    background-color: var(--container-bg);
    color: var(--text-color);
    width: 100%;
    margin-bottom: 1rem;
    transition: var(--transition);
}
  
#loadError {
    color: var(--wrong);
    margin-top: 0.8rem;
}
  
/* Responsive adjustments */
@media (max-width: 600px) {
    .quiz-container {
      padding: 1.5rem;
      margin: 0;
      width: calc(100% - 2rem);
    }
    
    h1 {
      font-size: 1.5rem;
    }
    
    .word {
      font-size: 1.8rem;
      padding: 1.2rem;
      margin: 1.5rem 0 2.5rem;
    }
    
    .button {
      font-size: 1rem;
      min-height: 50px;
    }
}