/* General Styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f5f5f5;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

/* Navigation */
.nav-bar {
    background: #4CAF50;
    color: white;
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-bar a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.2);
}

.nav-bar a:hover {
    background: rgba(255, 255, 255, 0.3);
}

.nav-bar h1 {
    margin: 0;
    font-size: 24px;
}

/* Upload Section */
.upload-section {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.upload-section input[type="file"] {
    display: none;
}

.upload-section button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.upload-section button:hover {
    background: #45a049;
}

/* Quick Create */
.quick-create {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.quick-create input[type="text"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.quick-create textarea {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: monospace;
}

.quick-create button {
    background: #2196F3;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
}

/* Deck List */
.deck-list {
    display: grid;
    gap: 15px;
    margin: 20px 0;
}

.deck-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.deck-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.deck-card h3 {
    margin: 0 0 10px 0;
    color: #333;
}

.deck-stats {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
}

.deck-actions {
    display: flex;
    gap: 10px;
}

.deck-actions button {
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.study-btn {
    background: #4CAF50;
    color: white;
}

.export-btn {
    background: #FF9800;
    color: white;
}

.delete-btn {
    background: #f44336;
    color: white;
}

/* Study Screen */
.back-btn {
    background: none;
    border: none;
    color: #4CAF50;
    cursor: pointer;
    font-size: 16px;
    padding: 10px 0;
}

.progress {
    font-size: 18px;
    color: #666;
    margin: 10px 0;
}

/* Flashcard */
.flashcard {
    background: white;
    border-radius: 12px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    margin: 20px 0;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

.flashcard:hover {
    box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.word-display {
    font-size: 32px;
    font-weight: bold;
    color: #333;
}

.translation-display {
    font-size: 28px;
    color: #4CAF50;
    margin-top: 20px;
}

.click-hint {
    font-size: 14px;
    color: #999;
    margin-top: 20px;
}

/* Rating Buttons */
.rating-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin: 20px 0;
}

.rating-btn {
    padding: 15px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.2s;
}

.rating-btn:hover {
    transform: scale(1.05);
}

.rating-btn span {
    font-size: 24px;
}

.easy {
    background: #4CAF50;
    color: white;
}

.medium {
    background: #FFC107;
    color: #333;
}

.hard {
    background: #FF9800;
    color: white;
}

.fail {
    background: #f44336;
    color: white;
}

/* Keyboard Hints */
.keyboard-hints {
    text-align: center;
    color: #999;
    font-size: 14px;
}

/* Instructions */
.instructions {
    background: #FFF3E0;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.instructions h3 {
    margin-top: 0;
    color: #E65100;
}

.instructions ol {
    margin: 10px 0;
    padding-left: 20px;
}
/* Upload button styling */
.upload-btn {
    display: inline-block;
    background: #4CAF50;
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    margin: 10px 0;
}

.upload-btn:hover {
    background: #45a049;
}

/* Create deck button */
.create-btn {
    background: #2196F3;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

/* Flashcard wrapper for edit button positioning */
.flashcard-wrapper {
    position: relative;
    margin: 20px 0;
}

.edit-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 10;
    background: white;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 14px;
    color: #555;
}

.edit-btn:hover {
    background: #f5f5f5;
    border-color: #999;
}

/* Edit card view */
.edit-card {
    background: white;
    border-radius: 12px;
    padding: 40px 30px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    min-height: 200px;
}

.edit-card label {
    display: block;
    font-size: 14px;
    color: #666;
    margin-bottom: 5px;
    margin-top: 15px;
}

.edit-card label:first-child {
    margin-top: 0;
}

.edit-card input {
    width: 100%;
    padding: 12px;
    font-size: 18px;
    border: 2px solid #ddd;
    border-radius: 8px;
    box-sizing: border-box;
}

.edit-card input:focus {
    outline: none;
    border-color: #4CAF50;
}

.edit-actions {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

.save-btn {
    flex: 1;
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
}

.save-btn:hover {
    background: #45a049;
}

.cancel-btn {
    flex: 1;
    background: #9E9E9E;
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
}

.cancel-btn:hover {
    background: #757575;
}

/* About Section */
.about-section {
    background: #f5f5f5;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.about-section h3 {
    margin-top: 0;
    color: #333;
}

.about-section p {
    line-height: 1.6;
    color: #555;
    margin: 0;
}

/* Add Words Section */
.add-words-section {
    background: #FFF3E0;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    border: 2px solid #FF9800;
}

.add-words-section h3 {
    margin-top: 0;
    color: #E65100;
}

.add-words-section textarea {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: monospace;
    min-height: 100px;
}

.add-words-buttons {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.add-words-btn {
    background: #FF9800;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.add-words-btn:hover {
    background: #F57C00;
}

.cancel-add-btn {
    background: #9E9E9E;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.cancel-add-btn:hover {
    background: #757575;
}

/* Add Words button in deck card */
.add-words-btn-small {
    background: #FF9800;
    color: white;
    padding: 8px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.add-words-btn-small:hover {
    background: #F57C00;
}

/* Deck list section */
.deck-list {
    margin-top: 20px;
}

/* Empty state */
.empty-state {
    text-align: center;
    color: #999;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
    border: 2px dashed #ddd;
}

/* Upload Status */
#uploadStatus {
    margin-top: 10px;
    font-weight: bold;
    color: #4CAF50;
}