* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-size: 13px;
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f2f5;
    font-family: Arial, sans-serif;
}

.container {
    width: 90%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.flashcard {
    width: 100%;
    height: 200px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: transform 0.3s ease;
}

.flashcard:hover {
    transform: translateY(-5px);
}

.word {
    font-size: 52px;
    color: #007bff;
    text-align: center;
    padding: 2rem;
}

.meaning {
    font-size: 24px;
    color: black;
    text-align: center;
    margin-top: 1px;
}

.controls {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.control-item {
    padding: 0.5rem 1rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
}

.control-item:hover {
    border-color: #007bff;
}

.unit-controls {
    display: flex;
    gap: 1rem;
    align-items: center;
}

select.control-item {
    width: 80px;
}

.settings-row {
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.interval-control, .auto-read-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.auto-read-control input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin-right: 8px;
}

input[type="number"] {
    width: 80px;
}

.buttons {
    display: flex;
    width: 320px; 
    gap: 1rem;
}

button.control-item {
    min-width: 60px;
    display: inline-block;
    background: #007bff;
    color: white;
    border: none;
    gap: 0.5rem;
}

button.control-item:hover {
    background: #0056b3;
}

button.control-item:disabled {
    background: #cccccc;
    cursor: not-allowed;
}