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

body {
    background: #f0f2f5;
    padding: 0 15px 30px 15px;
    color: #000;
}

header {
    background: #2563eb;
    margin: 0 -15px 25px -15px;
    padding: 25px 15px;
    text-align: center;
}

.page-title {
    color: #ffffff;
    font-size: 2.2rem;
    font-weight: 900;
    letter-spacing: -0.5px;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: block;
    width: 100%;
    background: #2563eb;
    color: #ffffff;
    padding: 22px 0;
    text-align: center;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.6rem;
    border: none;
    border-radius: 12px;
    margin-bottom: 15px;
    cursor: pointer;
    transition: background 0.15s;
}

.btn:active {
    background: #1d4ed8;
}

/* Inputs */
input[type="text"],
input[type="number"],
input[list] {
    width: 100%;
    display: block;
    padding: 18px 20px;
    font-size: 2.6rem;
    font-weight: 700;
    border: 4px solid #000;
    border-radius: 12px;
    margin-bottom: 20px;
    text-align: center;
    background: #fff;
    color: #000;
    outline: none;
    transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="number"]:focus,
input[list]:focus {
    border-color: #2563eb;
}