:root {
    --primary-color: #b0120a;
    --primary-hover: #8a0e08;
    --bg-color: #f4f6f9;
    --text-color: #333;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    font-family: 'Sarabun', Tahoma, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-color);
}

/* คลาสเฉพาะหน้า Login / Register / Setup PIN */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 15px;
}

.container {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

h2 { color: var(--primary-color); margin-bottom: 20px; font-size: 22px; }

.form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form-group label { display: block; margin-bottom: 5px; font-weight: bold; font-size: 14px; }

.form-control {
    width: 100%; padding: 10px 12px; border: 1px solid #ccc;
    border-radius: 5px; font-size: 15px; font-family: inherit;
}

.btn-primary {
    background-color: var(--primary-color); color: white;
    border: none; padding: 12px; border-radius: 5px;
    cursor: pointer; width: 100%; font-size: 16px; font-weight: bold;
    margin-top: 10px; transition: 0.3s;
}

.btn-primary:hover { background-color: var(--primary-hover); }

.alert {
    padding: 10px; background-color: #f8d7da; color: #721c24;
    border-radius: 5px; margin-bottom: 15px; border: 1px solid #f5c6cb; font-size: 14px;
}

.pin-input {
    letter-spacing: 12px; text-align: center; font-size: 22px; font-weight: bold;
}

/* ครอบตารางเพื่อให้เลื่อนซ้าย-ขวาบนมือถือได้ */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-top: 15px;
}