* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    color: #222;
}

.container {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    padding: 20px 15px 30px;
}

h1, h2, h3 {
    margin-top: 0;
    color: #111;
}

p {
    line-height: 1.5;
}

a {
    color: #1565c0;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.card {
    background: #fff;
    border: 1px solid #dcdfe3;
    border-radius: 12px;
    padding: 14px;
    margin: 10px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.btn,
button,
input[type="submit"] {
    display: inline-block;
    width: 100%;
    border: none;
    border-radius: 10px;
    background: #1565c0;
    color: white;
    padding: 12px 14px;
    font-size: 16px;
    cursor: pointer;
    text-align: center;
    margin-top: 8px;
}

.btn:hover,
button:hover,
input[type="submit"]:hover {
    background: #0d47a1;
    text-decoration: none;
}

.btn-secondary {
    background: #546e7a;
}

.btn-secondary:hover {
    background: #37474f;
}

.btn-danger {
    background: #c62828;
}

.btn-danger:hover {
    background: #8e0000;
}

input,
select {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #c8cdd2;
    border-radius: 10px;
    margin-top: 6px;
    margin-bottom: 10px;
    background: #fff;
}

label {
    font-weight: bold;
}

.form-block {
    background: #fff;
    border: 1px solid #dcdfe3;
    border-radius: 12px;
    padding: 15px;
    margin: 12px 0;
}

.menu-link {
    display: block;
    background: #fff;
    border: 1px solid #dcdfe3;
    border-radius: 12px;
    padding: 14px;
    margin: 10px 0;
    color: #222;
    text-decoration: none;
    font-weight: bold;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.menu-link:hover {
    background: #eef5ff;
    text-decoration: none;
}

.grid-cell {
    display: inline-block;
    min-width: 72px;
    text-align: center;
    border: 1px solid #bfc7d1;
    background: white;
    border-radius: 10px;
    margin: 5px;
    padding: 12px 8px;
    color: #222;
    text-decoration: none;
    font-weight: bold;
}

.grid-cell:hover {
    background: #eaf3ff;
    text-decoration: none;
}

.small-link {
    display: inline-block;
    margin-top: 8px;
    margin-right: 8px;
}

.notice {
    background: #fff8e1;
    border: 1px solid #f0d98a;
    border-radius: 10px;
    padding: 12px;
    margin: 10px 0;
}

.success {
    background: #e8f5e9;
    border: 1px solid #a5d6a7;
    border-radius: 10px;
    padding: 12px;
    margin: 10px 0;
}

.error {
    background: #ffebee;
    border: 1px solid #ef9a9a;
    border-radius: 10px;
    padding: 12px;
    margin: 10px 0;
}

hr {
    border: none;
    border-top: 1px solid #dcdfe3;
    margin: 18px 0;
}

pre {
    background: #fff;
    border: 1px solid #dcdfe3;
    border-radius: 10px;
    padding: 12px;
    overflow-x: auto;
    font-size: 14px;
}

.top-space {
    margin-top: 20px;
}

.center {
    text-align: center;
}

@media (max-width: 520px) {
    body {
        font-size: 16px;
    }

    .container {
        padding: 15px 12px 25px;
    }

    .grid-cell {
        min-width: 64px;
        padding: 10px 6px;
        margin: 4px;
    }
}