html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: "Microsoft JhengHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: #000;
    color: #fff;
}

/* --- Welcome 區（純靜態） --- */
.welcome-simple {
    min-height: 100vh;
    background: radial-gradient(circle at top, #222 0%, #000 70%);
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* 文字陰影讓金色更亮 */
.welcome-simple h1 {
    text-shadow: 0 2px 12px rgba(255, 215, 0, 0.35);
}

.welcome-simple p {
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
}

/* 按鈕微光效果 */
.btn-warning {
    box-shadow: 0 0 12px rgba(255, 193, 7, 0.4);
    font-size: 1.2rem;
}

.btn-warning:hover {
    box-shadow: 0 0 18px rgba(255, 193, 7, 0.6);
}

/* Modal 風格強化（黑金主題） */
.modal-content {
    border-radius: 0.75rem;
}

.modal-content.bg-dark {
    background: radial-gradient(circle at top, #222 0%, #000 60%);
}

.form-control.bg-black {
    background-color: #000;
}

.form-control.bg-black:focus {
    border-color: #ffc107;
    box-shadow: 0 0 0 0.2rem rgba(255, 193, 7, 0.25);
}
.text-shadow {
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.65);
}