@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&family=Montserrat:wght@700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

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

.back-button {
    display: inline-block;
    padding: 10px 20px;
    background-color: #1a237e;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    margin-bottom: 20px;
}

.back-button:hover {
    background-color: #0e1642;
}

h1 {
    text-align: center;
    color: #2196F3;
    margin-bottom: 30px;
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: -0.5px;
}

.number-input-container {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
}

input[type="text"] {
    flex: 1;
    padding: 10px;
    font-size: 16px;
    border: 2px solid #ccc;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    background-color: #2196F3;
    color: white;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.3px;
}

button:hover {
    background-color: #0e1642;
}

.result-container {
    background-color: #f5f5f5;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
}

.number-display, .reading-display {
    margin-bottom: 20px;
}

.number-display h3, .reading-display h3 {
    color: #1a237e;
    margin-bottom: 10px;
}

.number-display {
    font-size: 2rem;
    font-weight: 600;
    color: #2c3e50;
}

#formattedNumber, #numberReading {
    font-size: 18px;
    padding: 10px;
    background-color: white;
    border-radius: 5px;
    min-height: 40px;
}

.practice-container {
    background-color: #e3f2fd;
    padding: 20px;
    border-radius: 10px;
}

.practice-container h3 {
    color: #1a237e;
    margin-bottom: 15px;
}

.practice-number {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
    text-align: center;
}

.practice-result {
    margin-top: 15px;
    padding: 10px;
    border-radius: 5px;
    text-align: center;
}

.practice-result.correct {
    background-color: #c8e6c9;
    color: #2e7d32;
}

.practice-result.incorrect {
    background-color: #ffcdd2;
    color: #c62828;
}

.topbar {
    background-color: #2196F3;
    padding: 15px 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.logo-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    width: 48px;
    height: 48px;
}

.app-name {
    color: white;
    font-family: 'Montserrat', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}