:root {
    --ptc-primary: #004a8d; /* 屏東縣常用的藍色調 */
    --ptc-accent: #e6f0f9;
}

body {
    background-color: #f4f7f9;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: "Microsoft JhengHei", sans-serif;
    margin: 0;
}

/* 中間內容區佔滿剩餘空間 */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    overflow: hidden;
    max-width: 420px;
    width: 100%;
    background: white;
}

.login-header {
    background-color: var(--ptc-primary);
    color: white;
    padding: 25px;
    text-align: center;
}

.captcha-box {
    background: #eee;
    color: #333;
    font-family: 'Courier New', Courier, monospace;
    font-weight: bold;
    font-style: italic;
    letter-spacing: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    cursor: pointer;
    border-radius: 4px;
    border: 1px solid #ced4da;
    font-size: 1.2rem;
    min-width: 100px;
}

.footer-info {
    background-color: #fff;
    color: #6c757d;
    text-align: center;
    padding: 15px 0;
    font-size: 0.9rem;
    border-top: 1px solid #dee2e6;
}