* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.7;
    color: #333;
    background-color: #f5f7fa;
    margin: 0;
    padding: 30px;
}

header {
    background-color: #1a73e8;
    color: #fff;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    text-align: center;
}

header h1 {
    font-size: 2em;
    margin-bottom: 12px;
}

header .info p {
    margin: 4px 0;
    font-size: 1.05em;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

section {
    background: #fff;
    padding: 24px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

h2 {
    color: #1a73e8;
    margin-bottom: 12px;
    font-size: 1.4em;
}

p {
    margin-bottom: 10px;
    font-size: 1.05em;
}

code {
    background: #e8eef7;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.95em;
}

button {
    background-color: #1a73e8;
    color: #fff;
    border: none;
    padding: 12px 24px;
    font-size: 1em;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #1558b0;
}

#msg {
    margin-top: 12px;
    font-weight: bold;
    color: #1a73e8;
    min-height: 24px;
}

.counter-box {
    margin-top: 16px;
    text-align: center;
}

.counter-box span {
    display: inline-block;
    font-size: 2em;
    font-weight: bold;
    color: #1a73e8;
    background: #e8eef7;
    width: 60px;
    height: 60px;
    line-height: 60px;
    border-radius: 50%;
}

.interactive-section {
    text-align: center;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 16px;
    color: #888;
    font-size: 0.9em;
}