/* Основные стили */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    margin: 0;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: #333;
    margin-bottom: 10px;
}

.header p {
    color: #666;
    font-size: 16px;
}

/* Кнопки */
.btn {
    display: block;
    width: 100%;
    padding: 18px;
    margin: 15px 0;
    background: linear-gradient(135deg, #007bff, #0056b3);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,123,255,0.3);
}

.btn-disabled {
    background: linear-gradient(135deg, #6c757d, #495057);
    color: #adb5bd;
    cursor: not-allowed;
}

.btn-disabled:hover {
    transform: none;
    box-shadow: none;
}

.btn-textbook {
    background: linear-gradient(135deg, #28a745, #218838);
}

.btn-textbook:hover {
    box-shadow: 0 10px 20px rgba(40,167,69,0.3);
}

.btn-back {
    background: linear-gradient(135deg, #6c757d, #545b62);
}

.btn-remove {
    background: linear-gradient(135deg, #dc3545, #c82333);
}

.btn-remove:hover {
    box-shadow: 0 10px 20px rgba(220,53,69,0.3);
}

/* Компоненты упражнений */
.exercise-container {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
    margin: 15px 0;
    border-left: 4px solid #007bff;
}

.word-btn {
    margin: 8px;
    padding: 12px 20px;
    background: linear-gradient(135deg, #28a745, #218838);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
}

.word-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(40,167,69,0.3);
}

.word-btn-unlocked {
    background: linear-gradient(135deg, #17a2b8, #138496);
}

.selected-words {
    background: #e9ecef;
    padding: 20px;
    border-radius: 12px;
    margin: 15px 0;
    min-height: 60px;
    border: 2px dashed #dee2e6;
    font-size: 18px;
    font-weight: 500;
}

/* Сообщения и статусы */
.loading {
    text-align: center;
    padding: 20px;
    color: #666;
}

.error {
    background: #f8d7da;
    color: #721c24;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
}

.info-message {
    background: #d1ecf1;
    color: #0c5460;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
    border-left: 4px solid #17a2b8;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
    border-left: 4px solid #28a745;
    animation: fadeIn 0.5s ease-in;
}

.info-message-small {
    background: #d1ecf1;
    color: #0c5460;
    padding: 10px 15px;
    border-radius: 8px;
    margin: 10px 0;
    text-align: center;
    border-left: 4px solid #17a2b8;
    animation: fadeIn 0.5s ease-in;
}

/* Секция ввода */
.input-section {
    margin: 20px 0;
    text-align: center;
}

.word-input {
    padding: 12px;
    border: 2px solid #007bff;
    border-radius: 8px;
    font-size: 16px;
    width: 200px;
    margin-right: 10px;
}

.input-btn {
    padding: 12px 20px;
    background: linear-gradient(135deg, #ffc107, #e0a800);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}

.input-btn:hover {
    background: linear-gradient(135deg, #e0a800, #d39e00);
}

/* Разблокированные слова */
.unlocked-words {
    margin: 15px 0;
    padding: 15px;
    background: #e7f3ff;
    border-radius: 8px;
    border-left: 4px solid #17a2b8;
}

.counter {
    font-size: 14px;
    color: #6c757d;
    margin-top: 5px;
    font-weight: 500;
}

.word-badge {
    display: inline-block;
    margin: 5px;
    padding: 8px 12px;
    background: #17a2b8;
    color: white;
    border-radius: 5px;
    position: relative;
}

.word-number {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #dc3545;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Кнопки действий */
.action-buttons {
    display: flex;
    gap: 10px;
    margin: 15px 0;
}

.action-buttons .btn {
    margin: 0;
    flex: 1;
}

/* Анимации */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}